CN113275494A - Forging method of 1Mn18Cr18N steel retaining ring - Google Patents
Forging method of 1Mn18Cr18N steel retaining ring Download PDFInfo
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- CN113275494A CN113275494A CN202110607456.4A CN202110607456A CN113275494A CN 113275494 A CN113275494 A CN 113275494A CN 202110607456 A CN202110607456 A CN 202110607456A CN 113275494 A CN113275494 A CN 113275494A
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- 238000005242 forging Methods 0.000 title claims abstract description 63
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 42
- 239000010959 steel Substances 0.000 title claims abstract description 42
- 238000000034 method Methods 0.000 title claims abstract description 37
- 230000009467 reduction Effects 0.000 claims abstract description 34
- 238000005096 rolling process Methods 0.000 claims abstract description 31
- 238000004080 punching Methods 0.000 claims abstract description 11
- 238000001816 cooling Methods 0.000 claims abstract description 9
- 238000003825 pressing Methods 0.000 claims description 4
- 238000001514 detection method Methods 0.000 abstract description 11
- 238000001953 recrystallisation Methods 0.000 abstract description 6
- 238000005728 strengthening Methods 0.000 abstract description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 5
- 238000007599 discharging Methods 0.000 description 10
- 230000008569 process Effects 0.000 description 10
- 239000000463 material Substances 0.000 description 9
- 238000010438 heat treatment Methods 0.000 description 6
- 230000000630 rising effect Effects 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000005336 cracking Methods 0.000 description 3
- 239000013078 crystal Substances 0.000 description 3
- 238000004321 preservation Methods 0.000 description 3
- 230000035945 sensitivity Effects 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 239000011572 manganese Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Substances N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
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- 238000010248 power generation Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000007920 subcutaneous administration Methods 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
- B21J5/002—Hybrid process, e.g. forging following casting
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
- B21K1/00—Making machine elements
- B21K1/76—Making machine elements elements not mentioned in one of the preceding groups
- B21K1/761—Making machine elements elements not mentioned in one of the preceding groups rings
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Abstract
The invention discloses a forging method of a 1Mn18Cr18N steel retaining ring, which comprises the following steps: lightly forging and rolling; upsetting; punching; reaming; drawing out; reaming; drawing out; and water cooling, and by controlling the reduction, the reduction rate and the like in each step, the generation of forge piece cracks is avoided, so that the dynamic recrystallization of the forge piece is more sufficient, the 3-4-level uniform and fine grain size of the guard ring forge piece can be obtained, the yield strength of the forge piece before cold deformation strengthening is improved, and the 1Mn18Cr18N steel guard ring is ensured to meet the mechanical property and ultrasonic flaw detection requirements.
Description
Technical Field
The invention relates to the field of steel forging, in particular to a forging method of a 1Mn18Cr18N steel retaining ring.
Background
The protective rings are members which are sleeved at two ends of a generator rotor in a hot mode, tightly clamp the end portions of the coils, overcome the influence of centrifugal force and prevent the coils from being thrown out and deformed when the rotor rotates, and are one of key members in power generation equipment. The protective ring is subjected to not only a large centrifugal force but also an assembling stress, an alternating stress and a bending stress during hot charging in high-speed rotation.
At present, 1Mn18Cr18N guard ring steel is mostly adopted as the material of the guard ring. The steel not only meets the requirements of magnetic permeability and the like, but also can well meet the requirements of plasticity indexes, and more importantly, the steel greatly improves the stress corrosion resistance.
The mechanical property and ultrasonic flaw detection requirements are important acceptance indexes of the 1Mn18Cr18N steel retaining ring, and the grain size has great influence on the plasticity index in the mechanical property and the sensitivity of ultrasonic flaw detection.
The control of the grain size and uniformity of the guard ring is mainly determined by the forging process. The free forging of the high-manganese high-nitrogen steel retaining ring is difficult to control, the plasticity is poor, the cracking phenomenon is very serious, and the crack defect is difficult to remove, so that the problem of blank making by hot forging becomes a key for restricting the production of the retaining ring at present.
Disclosure of Invention
The invention aims to provide a forging method of a 1Mn18Cr18N steel retaining ring, which overcomes the defects in the prior art.
In order to solve the technical problems, the technical scheme of the invention is as follows:
a forging method of a 1Mn18Cr18N steel retaining ring comprises the following steps:
s1, performing light forging and rolling on the whole guard ring electroslag ingot by adopting an upper flat V-shaped anvil and a lower V-shaped anvil to form a guard ring billet with phi 900mm, wherein the rolling reduction does not exceed 20mm, and the rolling reduction rate does not exceed 5 mm/S;
s2, upsetting the ring guard billet subjected to the previous step to 750mm in height by adopting an upper flat plate and a lower flat plate, wherein the pressing speed is not more than 10 mm/S;
s3, punching a hole with the diameter of 400mm on the retaining ring steel billet which is subjected to the previous step by adopting a double-sided punching method, wherein the pressing speed is not more than 20 mm/S;
s4, reaming the protection ring billet subjected to the previous step to an inner hole phi of 510mm by matching the core rod and the upper flat anvil, wherein the reduction amount is not more than 50mm, and the reduction rate is not more than 5 mm/S;
s5, drawing and flattening the ring protection billet subjected to the previous step to 1000mm by matching a core rod and an upper flat V-shaped anvil, wherein the rolling reduction is not more than 50mm, the anvil receiving amount is not less than 20%, and the rolling reduction rate is not more than 5 mm/S;
s6, reaming the protection ring billet subjected to the previous step to an inner hole phi of 610mm by matching the core rod and the upper flat anvil, wherein the reduction amount is not more than 50mm, and the reduction rate is not more than 5 mm/S;
s7, drawing and flattening the ring protection billet subjected to the previous step to 1320mm by matching the core rod and the upper flat lower V-shaped anvil, immediately cooling to room temperature after finishing, wherein the rolling reduction is not more than 50mm, the anvil receiving amount is not less than 20%, and the rolling reduction rate is not more than 5 mm/S.
In a preferred embodiment of the present invention, before the processing in steps S1-S7, the temperature of the retaining ring electroslag ingot or the retaining ring billet is kept at 1150-1220 ℃.
In a preferred embodiment of the present invention, the tooling required to be used is preheated to 200-300 ℃ before the processing in steps S1-S7.
In a preferred embodiment of the present invention, the finish forging temperature of steps S1-S7 is not lower than 950 ℃.
In a preferred embodiment of the present invention, the forging ratios in steps S4-S7 are all less than 1.4.
In a preferred embodiment of the present invention, in step S1, the upper flat anvil has a size of 600mm × 1500mm, the lower V anvil has a size of 1500mm × 1800mm, the V-groove angle is 110 °, and the V-groove depth is 500 mm.
In a preferred embodiment of the present invention, the upper flat anvil size is 600mm × 1500mm, the lower V anvil size is 600mm × 1500mm, the V groove angle is 110 °, and the V groove depth is 500mm in steps S5 and S7.
In a preferred embodiment of the present invention, the height of the shroud ring billet formed in step S1 is 1360 ± 10 mm.
In a preferred embodiment of the present invention, before step S1, the temperature of the guard ring electroslag ingot is raised from 400-500 ℃ to 750-800 ℃ at a temperature raising rate of not more than 60 ℃/hr, and from 750-800 ℃ to 1150-1220 ℃ at a temperature raising rate of not more than 80 ℃/hr.
In a preferred embodiment of the present invention, before the step S2, the material temperature of the ring-protecting billet is 1150-1220 ℃ and the temperature is kept for 4-6 h.
Compared with the prior art, the invention has the beneficial effects that:
the method adopts the steps of light forging and rolling, upsetting and punching, twice reaming, twice drawing out and water cooling to forge the 1Mn18Cr18N retaining ring billet, and controls the reduction, the reduction rate and the like in each step to avoid the generation of forging cracks, so that the dynamic recrystallization of the forging is more sufficient, the 3-4-level uniform and fine grain size of the retaining ring forging can be obtained, the yield strength of the forging before cold deformation strengthening is improved, and the 1Mn18Cr18N steel retaining ring can meet the requirements of mechanical property and ultrasonic flaw detection.
Drawings
FIG. 1(a) is a schematic view showing the heating control in step S1 of the present invention, and (b) is a schematic view showing the shroud ring billet formed in step S1 of the present invention;
FIG. 2 is a schematic view of the shroud ring steel blank formed in step S2 according to the present invention;
FIG. 3 is a schematic view of the shroud ring steel blank formed in step S3 according to the present invention;
FIG. 4 is a schematic view of the shroud ring steel blank formed in step S4 according to the present invention;
FIG. 5 is a schematic view of the shroud ring steel blank formed in step S5 according to the present invention;
FIG. 6 is a schematic view of the shroud ring steel blank formed in step S6 according to the present invention;
FIG. 7 is a schematic view of the shroud ring steel blank formed in step S7 according to the present invention;
FIG. 8 is a schematic view of a 300MW water-hydrogen cooling grommet according to the present invention;
FIG. 9 is a schematic diagram of a 300MW guard ring grain size sampling according to the present invention.
Detailed Description
The disclosure may be understood more readily by reference to the following detailed description of preferred embodiments of the invention and the examples included therein. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. In case of conflict, the present specification, including definitions, will control. For example, a composition, process, method, article, or apparatus that comprises a list of elements is not necessarily limited to only those elements but may include other elements not expressly listed or inherent to such composition, process, method, article, or apparatus.
When an amount, concentration, or other value or parameter is expressed as a range, preferred range, or as a range of upper preferable values and lower preferable values, this is to be understood as specifically disclosing all ranges formed from any pair of any upper range limit or preferred value and any lower range limit or preferred value, regardless of whether ranges are separately disclosed. For example, when the range "1 ~ 5" is disclosed, the ranges described should be construed to include the ranges "1 ~ 4", "1 ~ 3", "1 ~ 2 and 4 ~ 5", "1 ~ 3 and 5", and the like. When a range of values is described herein, unless otherwise stated, the range is intended to include the endpoints thereof and all integers and fractions within the range.
The singular forms "a", "an" and "the" include plural referents unless the context clearly dictates otherwise. "optional" or "any" means that the subsequently described event or events may or may not occur, and that the description includes instances where the event occurs and instances where it does not.
Approximating language, as used herein throughout the specification and claims, is intended to modify a quantity, such that the invention is not limited to the specific quantity, but includes portions that are literally received for modification without substantial change in the basic function to which the invention is related. Accordingly, the use of "about" to modify a numerical value means that the invention is not limited to the precise value. In some instances, the approximating language may correspond to the precision of an instrument for measuring the value. In the present description and claims, range limitations may be combined and/or interchanged, including all sub-ranges contained therein if not otherwise stated.
The forging method of the 1Mn18Cr18N steel retaining ring comprises the working procedures of light forging rolling, upsetting punching, twice reaming, twice drawing and water cooling, and comprises the following specific steps:
the whole forging process is divided into seven times of heating.
S1 first fire:
as shown in figure 1, heating and heat preservation are carried out on the retaining ring electroslag ingot, the temperature is kept for 3-6 h from 400-500 ℃ to 750-800 ℃, the temperature rising speed is controlled not to exceed 60 ℃/h, the temperature is kept for 8-12 h from 750-800 ℃ to 1150-1220 ℃, the temperature rising speed is controlled not to exceed 80 ℃/h, 1150-1220 ℃ is the material temperature of the retaining ring electroslag ingot, and the temperature is kept for 10-14 h.
The internal stress of the steel ingot can be fully released by controlling the temperature rising speeds of the two sections not to exceed 60 ℃ and not to exceed 80 ℃, and if the temperature rising speed is too high and the internal stress of the steel ingot is not fully released, a large amount of cracks can be generated during the subsequent rolling of the steel ingot.
The heating temperature is controlled to keep the temperature of the retaining ring blank at 1150-1220 ℃, the deformation resistance of the retaining ring blank is small in the temperature range, and the forged grain size of the retaining ring forging can be kept at 3-4 level. If the heating temperature is lower than the range, the deformation resistance of the retaining ring forging is large, and a large number of cracks are generated in the forging process to influence the product quality; if the heating temperature is higher than the range, although the deformation resistance is reduced, the growth of crystal grains in the structure of the retaining ring forging piece is aggravated, the grain size of the finally forged crystal grain is coarser than 2 grade, and the ultrasonic flaw detection sensitivity and the mechanical property of the subsequent retaining ring forging piece are influenced.
And (3) preheating the tool to 200-300 ℃ before discharging. And after discharging, adopting an upper flat V-shaped anvil and a lower flat V-shaped anvil to perform light forging and rolling on the whole guard ring electroslag ingot to reach phi 900 mm. Wherein, the size of the upper flat anvil is 600mm multiplied by 1500mm, the size of the lower V anvil is 1500mm multiplied by 1800mm, the angle of the V groove is 110 degrees, and the depth of the V groove is 500 mm. In the rolling process, the rolling reduction is controlled not to exceed 20mm, the rolling rate is controlled not to exceed 5mm/s, and the final forging temperature is not lower than 950 ℃.
The forging piece is subjected to the action of three-dimensional compressive stress by using the upper flat V-shaped anvil and the lower flat V-shaped anvil in an integral rolling manner, so that a flat outer circle is ensured to be obtained, the internal stress of a steel ingot is released, and subcutaneous cracks are welded to avoid generating cracks during upsetting. If the upper and lower flat anvils are adopted for integral rolling, the forging piece is subjected to the action of tensile stress in two directions, cracks can be generated at two ends of the steel ingot of the retaining ring, and the cracks can possibly penetrate through the whole steel ingot along the axial direction; if the upper flat and lower V-shaped anvils are adopted for sectional rolling, the surface of the steel ingot of the retaining ring is not flat enough, so that cracks are generated on the surface of the steel ingot of the second fire after upsetting, and the product quality is influenced.
S2 second fire:
as shown in figure 2, the temperature of the material of the retaining ring billet is 1150-1220 ℃. And (3) preheating the tool to 200-300 ℃ before discharging. And after discharging, upsetting to 750mm in height by using upper and lower flat plates. During upsetting, the reduction rate is controlled not to exceed 10mm/s, and the final forging temperature is not lower than 950 ℃.
Preferably, the height of the ring protection billet formed in the step S1 is 1360 +/-10 mm, and then the ring protection billet is subjected to heat preservation for 4-6 hours at the temperature of 1150-1220 ℃, so that the heat preservation time of the ring protection billet is effectively shortened, the forging efficiency is improved, and meanwhile, the height is also beneficial to upsetting and forming the ring protection billet in the step S2, and the cracking risk is reduced.
S3 third fire:
as shown in FIG. 3, the temperature of the material of the retaining ring billet is 1150-1220 ℃. And (3) preheating the tool to 200-300 ℃ before discharging. And after the furnace is discharged, punching a hole with the diameter of 400mm by adopting a double-sided punching method. When punching, the rolling rate is controlled not to exceed 20mm/s, and the final forging temperature is not lower than 950 ℃.
S4 fourth fire:
as shown in FIG. 4, the temperature of the material of the retaining ring billet is 1150-1220 ℃. And (3) preheating the tool to 200-300 ℃ before discharging. And (4) after the furnace is taken out, reaming the hole to an inner hole phi of 510mm by using a core rod. Wherein, the size of the core rod is phi 350mm, and the size of the upper flat anvil is 1500mm multiplied by 2000 mm. In the hole expanding process, the reduction is controlled not to exceed 50mm, the reduction rate is controlled not to exceed 5mm/s, and the final forging temperature is not lower than 950 ℃.
S5 fifth fire:
as shown in FIG. 5, the temperature of the material of the retaining ring billet is 1150-1220 ℃. And (3) preheating the tool to 200-300 ℃ before discharging. And drawing and flattening to 1000mm by using a core rod after discharging. Wherein, the size of the core rod is phi 500mm, the size of the upper flat anvil is 600mm multiplied by 1500mm, the size of the lower V anvil is 600mm multiplied by 1500mm, the angle of the V groove is 110 degrees, and the depth of the V groove is 500 mm. In the drawing process, the rolling reduction is controlled to be not more than 50mm, the anvil receiving amount is not less than 20%, the rolling rate is not more than 5mm/s, and the finish forging temperature is not less than 950 ℃.
S6 sixth fire:
as shown in FIG. 6, the temperature of the material of the retaining ring billet is 1150-1220 ℃. And (3) preheating the tool to 200-300 ℃ before discharging. And (4) after the furnace is taken out, reaming the hole to an inner hole phi of 610mm by using a core rod. Wherein, the size of the core rod is phi 500mm, and the size of the upper flat anvil is 1500mm multiplied by 2000 mm. In the hole expanding process, the reduction is controlled not to exceed 50mm, the reduction rate is controlled not to exceed 5mm/s, and the final forging temperature is not lower than 950 ℃.
S7 fire seventh:
as shown in FIG. 7, the temperature of the material of the retaining ring billet is 1150-1220 ℃. And (3) preheating the tool to 200-300 ℃ before discharging. And (4) drawing and flattening to 1320mm by using a core rod after the furnace is taken out, and immediately cooling to room temperature by water after the drawing is finished. Wherein, the size of the core rod is phi 600mm, the size of the upper flat anvil is 600mm multiplied by 1500mm, the size of the lower V anvil is 600mm multiplied by 1500mm, the angle of the V groove is 110 degrees, and the depth of the V groove is 500 mm. In the drawing process, the rolling reduction is controlled to be not more than 50mm, the anvil receiving amount is not less than 20%, the rolling rate is not more than 5mm/s, and the finish forging temperature is not less than 950 ℃.
Preferably, the forging ratios in the steps S4-S7 are all less than 1.4, so that a large deformation is decomposed into the accumulation results of a plurality of small deformations along with temperature drop, the dynamic recrystallization structure is favorably obtained, and the 3-4-level uniform and fine grain size of the guard ring forging can be obtained; meanwhile, the problem of forging cracking caused by large deformation is effectively solved. If the forging ratio is more than 1.4, when the drawing length or the hole expansion amount is large, cracks are easily generated on the surface of the forging to influence the product quality. The large deformation amount of one pass can easily cause the phenomenon of mixed crystals of the retaining ring structure, and the ultrasonic flaw detection sensitivity and the mechanical property of the subsequent retaining ring forging are influenced.
In the embodiment, the final structure result obtained by a single-pass large deformation amount is not beneficial to the improvement of the strength index of the retaining ring through the functions of the sub-dynamic recrystallization, the static recrystallization and the hardening effect of multi-pass deformation.
Through the series of steps, the normal-temperature yield strength of the retaining ring forging before cold deformation strengthening is stabilized at 575MPa, the high-temperature yield strength (100 ℃) is stabilized at 465MPa, the yield strength margin after cold deformation strengthening is improved, and a foundation is laid for the subsequent cold deformation strengthening process.
As shown in fig. 8, the 300MW water-hydrogen cooling guard ring manufactured by the above method is sampled and subjected to grain size detection as shown in fig. 9, and the results are as follows:
table 1300 MW guard ring T end grain size detection result
Table 2300 MW guard ring B end grain size detection result
The results show that the grain size of the retaining ring manufactured by the method is basically about 3-4 grades, is uniform and fine, and meets the requirements of mechanical properties and ultrasonic flaw detection.
In conclusion, the method adopts the steps of light forging and rolling, upsetting and punching, twice reaming, twice drawing and water cooling to forge the 1Mn18Cr18N retaining ring billet, and controls the reduction, the reduction rate and the like in each step to avoid the generation of forging cracks, so that the dynamic recrystallization of the forging is more sufficient, the 3-4-level uniform and fine grain size of the retaining ring forging can be obtained, the yield strength of the forging before cold deformation strengthening is improved, and the 1Mn18Cr18N steel retaining ring can meet the requirements on mechanical properties and ultrasonic flaw detection.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Claims (10)
1. A forging method of a 1Mn18Cr18N steel retaining ring is characterized by comprising the following steps:
s1, performing light forging and rolling on the whole guard ring electroslag ingot by adopting an upper flat V-shaped anvil and a lower V-shaped anvil to form a guard ring billet with phi 900mm, wherein the rolling reduction does not exceed 20mm, and the rolling reduction rate does not exceed 5 mm/S;
s2, upsetting the ring guard billet subjected to the previous step to 750mm in height by adopting an upper flat plate and a lower flat plate, wherein the pressing speed is not more than 10 mm/S;
s3, punching a hole with the diameter of 400mm on the retaining ring steel billet which is subjected to the previous step by adopting a double-sided punching method, wherein the pressing speed is not more than 20 mm/S;
s4, reaming the protection ring billet subjected to the previous step to an inner hole phi of 510mm by matching the core rod and the upper flat anvil, wherein the reduction amount is not more than 50mm, and the reduction rate is not more than 5 mm/S;
s5, drawing and flattening the ring protection billet subjected to the previous step to 1000mm by matching a core rod and an upper flat V-shaped anvil, wherein the rolling reduction is not more than 50mm, the anvil receiving amount is not less than 20%, and the rolling reduction rate is not more than 5 mm/S;
s6, reaming the protection ring billet subjected to the previous step to an inner hole phi of 610mm by matching the core rod and the upper flat anvil, wherein the reduction amount is not more than 50mm, and the reduction rate is not more than 5 mm/S;
s7, drawing and flattening the ring protection billet subjected to the previous step to 1320mm by matching the core rod and the upper flat lower V-shaped anvil, immediately cooling to room temperature after finishing, wherein the rolling reduction is not more than 50mm, the anvil receiving amount is not less than 20%, and the rolling reduction rate is not more than 5 mm/S.
2. The forging method of the 1Mn18Cr18N steel retaining ring according to claim 1, wherein before the processing in steps S1-S7, the retaining ring electroslag ingot or the retaining ring billet is kept at 1150-1220 ℃.
3. The forging method of the 1Mn18Cr18N steel retaining ring according to claim 1, wherein the tooling required to be used is preheated to 200-300 ℃ before processing in steps S1-S7.
4. The forging method of the 1Mn18Cr18N steel retaining ring according to claim 1, wherein the finish forging temperature of the steps S1-S7 is not lower than 950 ℃.
5. The forging method of the 1Mn18Cr18N steel retaining ring according to claim 1, wherein the forging ratios in steps S4-S7 are all less than 1.4.
6. The forging method of 1Mn18Cr18N steel retaining ring according to claim 1, wherein in step S1, the upper flat anvil size is 600mm x 1500mm, the lower V anvil size is 1500mm x 1800mm, the V groove angle is 110 °, and the V groove depth is 500 mm.
7. The forging method of 1Mn18Cr18N steel retaining ring according to claim 1, wherein the upper flat anvil size is 600mm x 1500mm, the lower V anvil size is 600mm x 1500mm, the V groove angle is 110 °, and the V groove depth is 500mm in steps S5 and S7.
8. The method for forging the 1Mn18Cr18N steel retaining ring of claim 1, wherein the height of the retaining ring billet formed in the step S1 is 1360 ± 10 mm.
9. The method for forging the 1Mn18Cr18N steel retaining ring according to claim 2, wherein before step S1, the temperature of the retaining ring electroslag ingot is raised from 400-500 ℃ to 750-800 ℃ at a temperature raising rate of not more than 60 ℃/h, and from 750-800 ℃ to 1150-1220 ℃ at a temperature raising rate of not more than 80 ℃/h.
10. The method for forging the 1Mn18Cr18N steel retaining ring according to claim 8, wherein the temperature of the retaining ring billet is 1150-1220 ℃ for 4-6 h before processing in step S2.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113798420A (en) * | 2021-09-17 | 2021-12-17 | 四川丰元机械制造有限公司 | Forging method of non-magnetic retaining ring of turbo-generator 1Mn18Cr18N |
| CN116020963A (en) * | 2022-12-30 | 2023-04-28 | 安徽省瑞杰锻造有限责任公司 | A kind of forging process of 50Mn18Cr4V steel retaining ring |
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| CN101255490A (en) * | 2008-03-17 | 2008-09-03 | 德阳万鑫电站产品开发有限公司 | After-forging grain-refining strength-toughening treatment process of 1Mn18Cr18N steel guard ring for generating set |
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| CN104338880A (en) * | 2013-07-31 | 2015-02-11 | 上海重型机器厂有限公司 | Method for forging 1Mn18Cr18N steel guard ring for large power station |
| CN107866665A (en) * | 2017-10-10 | 2018-04-03 | 张家港中环海陆特锻股份有限公司 | Million MW class nuclear power generating sets high intensity retaining ring manufacturing process |
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| CN102350474A (en) * | 2011-08-19 | 2012-02-15 | 太原科技大学 | Control method for hot forging structure property of Mn18Cr18N steel retaining ring |
| CN104338880A (en) * | 2013-07-31 | 2015-02-11 | 上海重型机器厂有限公司 | Method for forging 1Mn18Cr18N steel guard ring for large power station |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113798420A (en) * | 2021-09-17 | 2021-12-17 | 四川丰元机械制造有限公司 | Forging method of non-magnetic retaining ring of turbo-generator 1Mn18Cr18N |
| CN113798420B (en) * | 2021-09-17 | 2024-05-03 | 四川丰元机械制造有限公司 | Forging method of non-magnetic retaining ring of 1Mn18Cr18N of turbogenerator |
| CN116020963A (en) * | 2022-12-30 | 2023-04-28 | 安徽省瑞杰锻造有限责任公司 | A kind of forging process of 50Mn18Cr4V steel retaining ring |
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