CN1045623C - Bluing and low-carbon martensite heat treatment of high strength building steel bar - Google Patents
Bluing and low-carbon martensite heat treatment of high strength building steel bar Download PDFInfo
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- CN1045623C CN1045623C CN96106625A CN96106625A CN1045623C CN 1045623 C CN1045623 C CN 1045623C CN 96106625 A CN96106625 A CN 96106625A CN 96106625 A CN96106625 A CN 96106625A CN 1045623 C CN1045623 C CN 1045623C
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- Prior art keywords
- steel bars
- low
- reinforcing bar
- carbon
- tempering
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 31
- 239000010959 steel Substances 0.000 title claims abstract description 31
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 25
- 229910000734 martensite Inorganic materials 0.000 title claims abstract description 25
- 238000010438 heat treatment Methods 0.000 title description 7
- 238000010791 quenching Methods 0.000 claims abstract description 39
- 230000000171 quenching effect Effects 0.000 claims abstract description 33
- 238000005496 tempering Methods 0.000 claims abstract description 26
- 238000001816 cooling Methods 0.000 claims abstract description 13
- 229910001339 C alloy Inorganic materials 0.000 claims abstract description 9
- 239000007788 liquid Substances 0.000 claims abstract description 9
- 230000003014 reinforcing effect Effects 0.000 claims description 48
- 238000000034 method Methods 0.000 claims description 33
- 230000008569 process Effects 0.000 claims description 24
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 7
- 239000012530 fluid Substances 0.000 claims description 7
- 238000005516 engineering process Methods 0.000 claims description 5
- 238000010276 construction Methods 0.000 abstract description 5
- 230000008901 benefit Effects 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 229910001209 Low-carbon steel Inorganic materials 0.000 abstract description 2
- 239000000203 mixture Substances 0.000 abstract description 2
- 239000002344 surface layer Substances 0.000 abstract 1
- 229910000859 α-Fe Inorganic materials 0.000 abstract 1
- 239000007921 spray Substances 0.000 description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 238000005098 hot rolling Methods 0.000 description 4
- LPXPTNMVRIOKMN-UHFFFAOYSA-M sodium nitrite Chemical compound [Na+].[O-]N=O LPXPTNMVRIOKMN-UHFFFAOYSA-M 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- 229910000975 Carbon steel Inorganic materials 0.000 description 3
- 229910001566 austenite Inorganic materials 0.000 description 3
- 239000010962 carbon steel Substances 0.000 description 3
- 238000009413 insulation Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000002918 waste heat Substances 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000006698 induction Effects 0.000 description 2
- FGIUAXJPYTZDNR-UHFFFAOYSA-N potassium nitrate Chemical compound [K+].[O-][N+]([O-])=O FGIUAXJPYTZDNR-UHFFFAOYSA-N 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 238000002791 soaking Methods 0.000 description 2
- VWDWKYIASSYTQR-UHFFFAOYSA-N sodium nitrate Chemical compound [Na+].[O-][N+]([O-])=O VWDWKYIASSYTQR-UHFFFAOYSA-N 0.000 description 2
- 235000010288 sodium nitrite Nutrition 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 238000007669 thermal treatment Methods 0.000 description 2
- 210000001519 tissue Anatomy 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 229910001018 Cast iron Inorganic materials 0.000 description 1
- FBPFZTCFMRRESA-JGWLITMVSA-N D-glucitol Chemical compound OC[C@H](O)[C@@H](O)[C@H](O)[C@H](O)CO FBPFZTCFMRRESA-JGWLITMVSA-N 0.000 description 1
- 229910001374 Invar Inorganic materials 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000000411 inducer Substances 0.000 description 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- -1 iron ion Chemical class 0.000 description 1
- SZVJSHCCFOBDDC-UHFFFAOYSA-N iron(II,III) oxide Inorganic materials O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 210000003205 muscle Anatomy 0.000 description 1
- 235000010333 potassium nitrate Nutrition 0.000 description 1
- 239000004323 potassium nitrate Substances 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 239000012266 salt solution Substances 0.000 description 1
- 235000010344 sodium nitrate Nutrition 0.000 description 1
- 239000004317 sodium nitrate Substances 0.000 description 1
- 229940001516 sodium nitrate Drugs 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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- Heat Treatment Of Strip Materials And Filament Materials (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
The present invention relates to heat processing for bluing low-carbon martensite of high strength construction steel bars. In the heat processing, low-carbon steel bars or low-carbon alloy steel bars are used for carrying out processing with a self-tempering property and a high mechanical property. The heat processing has the following steps: when the steel bars are heated at 50 to 150 DEG C above Ac3, heat is preserved; quenching medium liquid is added for intensely cooling quenching; the surface layers of the steel bars are controlled to be lath martensite, and the center parts of the steel bars are the mixtures of the martensite and ferrite; the steel bars replace intermediate carbon alloy steel bars, have the same high mechanical property of the intermediate carbon alloy steel bars after processing, reach standards and are simultaneously blue; tempering is cancelled, and devices, electric energy and factory buildings are saved; original production lines are reformed for saving cost; the steel bars are directly used with hot-rolled steel bars and are processed by steel bar residual heat, so steel for building engineering is saved, and economic benefits are obvious.
Description
The present invention relates to a kind of steel heat treatment process, particularly a kind of high-strength building reinforcing bar turns blue, low-carbon martensite heat-treating process.
According to GB and Nippon Standard, to using the mechanical property requirement of high-strength building reinforcing bar, GB GB4463-84 regulation: tensile strength (σ b) is minimum to be 1470N/mm
2Unit elongation (δ 10)＞6%; Japan JIRS3109 standard code: tensile strength (σ b) is minimum to be 1420N/mm
2, unit elongation (δ 8)＞5%.For ensureing construction quality, reinforcing bar should have enough mechanical propertys, so the material of these reinforcing bars generally all is as 40Si
2Mn, 48Si
2Mn, 45Si
2Medium carbon alloy steel and 27SiMnB such as cr, 30CrMnSi, 30MnB.Reinforcing bar is heat-treated after rolling, because goods are elongated, known heat treating method is to carry out on automatic production line, main technique comprises successively: with two-way straightening roll reinforcing bar is carried out alignment, quenching inducer is heated to 900-1000 ℃ with reinforcing bar, Cooling Quenching, reinforcing bar was heated to 400-450 ℃ after the tempering inductor block will quench again, carry out tempering, tempering postcooling, closing quotation.Metallographic structure is a troostite after the thermal treatment.Common goods are easy to get rusty in application, for increasing antirust function, also should once implement the processing of turning blue that is the devil separately separately.This processing method obviously requires material good, and operation is long, and energy consumption is big, wastes time and energy; The procuring equipment costliness, to take factory building length bigger, expensive bigger.
In order to solve this technical barrier, people are making great efforts to study new method.Through patent retrieval, Application No. 184324 has just been described a kind of " gren rod direct heat treatment process ", it is to utilize waste heat that wire rod itself comes out from roller press through a controlled cooling apparatus, reduce the temperature to the series of steps in the Ms-550 ℃ of scope, and wire rod is reheated thereupon with the corresponding temperature of isothermal cooling curve (T, T, T) nose under be incubated, in the hope of reaching the purpose that changes fully to the sorbite weave construction.As if it can obtain beneficial effect in force, obtain still there is deficiency aspect better technology, the economical effectiveness but to resolve how with saving means.
The objective of the invention is to provide that a kind of high-strength building reinforcing bar turns blue, low-carbon martensite heat-treating process, after it can effectively utilize the low-carbon (LC) reinforcing bar and quenches, formation lath martensite tissue, make it have the self-tempering characteristic, the cancellation tempering process, improve mechanical property, and finish the processing of turning blue simultaneously.
The object of the present invention is achieved like this: utilize the reinforcing bar of soft steel or low-carbon alloy steel, carry out after low carbon martensite handles, it is had turn blue, the self-tempering characteristic, and high-mechanical property.Its technology comprises the steps: that 1. said low-carbon (LC) reinforcing bars heat itself is to Ac
3On 50-150 ℃ the time; 2. insulation is 0-10 minute; 3. in quenching process, directly be 15-60 ℃ the strong Cooling Quenching of the dielectric fluid that turns blue by temperature, with its simultaneously to the rebar surface processing of turning blue.
Cancelling said is 15-60 ℃ the strong Cooling Quenching of the dielectric fluid that turns blue by temperature directly, is that 15-60 ℃ quenchant liquid is handled but adopt directly by temperature, to obtain same high-mechanical property.
Saidly make it have the self-tempering characteristic, be meant that tempering voluntarily takes place reinforcing bar in the quench cooled process, with the cancellation tempering process.
Advantage of the present invention: after the reinforcing bar that utilizes soft steel or low-carbon alloy steel to substitute medium carbon alloy steel was handled, mechanical property and the energy that can obtain same high strength cast iron were up to standard, also have the antirust function of turning blue simultaneously; For construction work, can reduce the reinforcing bar section relatively, save steel; After the quenching, the cancellation tempering process, saving equipment, electric energy and factory building length are transformed old production line, and is cost-saved; Directly and the coupling of reinforcing bar hot rolling system, utilize rolling reinforcing bar waste heat to handle, its economic benefit is more remarkable.
Description of drawings:
Fig. 1 is that a kind of high-strength building reinforcing bar that proposes according to the present invention turns blue, the carbon steel 20 austenite Continuous Cooling Transformation Curve synoptic diagram of low-carbon martensite heat-treating process;
Fig. 2 is a test-results gained lath martensite metallographic structure photo.
Describe the method details that proposes according to the present invention in detail below in conjunction with Fig. 1～2.
This invention comprises and utilizes mild steel reinforcement, carries out making it have the prison of sending out, self-tempering characteristic after low carbon martensite handles, and high-mechanical property.Its technology comprises the steps:
1. low-carbon (LC) reinforcing bar heat itself is to Ac
3On 50-150 ℃ the time;
2. insulation is 0-10 minute;
3. in quenching process, directly be 15-60 ℃ the strong Cooling Quenching of the dielectric fluid that turns blue by temperature, with its simultaneously to the rebar surface processing of turning blue.
Be noted that at first said soft steel is meant low-carbon (LC) carbon steel and low-carbon alloy steel (following also same).Reinforcing bar heat itself is to Ac
3On 50-150 ℃ the time.Here include the meaning of two aspects, one is meant reinforcing bar under the normal temperature, through induction heating equipment reinforcing bar is heated to this temperature range; It is two when being meant the reinforcing bar hot rolling, and after hot rolling system was finished, the waste heat that reinforcing bar itself is had was to this temperature range, and the immediate quenching temperature should be not less than A certainly
R3For the present invention, the important heat treating method that is, which aspect is shorter mention type of heating and equipment especially no matter are, its heat treating method is basic identical.Temperature value in the temperature range, this will specifically be determined according to factors such as material, purposes, heating conditions by the technician.Low-carbon (LC) reinforcing bar under the normal temperature is handled, and what need routine equally carries out alignment with two-way straightening roll to it, and induction heating equipment heats, and after the quenching operation is finished, closes.The circle that quenches forms according to the volution coiling with flat copper pipe, and its below is provided with the funnel that reclaims quenchant liquid.The whole length of circle of quenching, need according to reinforcing bar diameter, carry out factor such as speed and calculate and determine.Strong Cooling Quenching has three kinds of modes, then relates to the circle that quenches and has nothing in common with each other.One quenching whole process is spray and quenches, and the circle horizontal direction of quenching (the consistent direction of carrying out according to reinforcing bar) is provided with.The interior circle of total length (being the flat copper pipe inwall) of quenching circle is gone up distribution and is shaped on the spray orifice that points to reinforcing bar travel track position, and spraying the operating pressure of quenching is 400-600kpa, encloses to spray in whole length to realize quenching and quenches.Its two quenchings whole process is quenched, is soaked to quench and combine for spray, i.e. one section quenching circle that is provided with for horizontal direction, another section is provided with slightly downward-sloping pipe thereupon, and enter continuous in pipe, the competent water spray of that end from reinforcing bar, the other end water outlet of pipe, realize that one section of reinforcing bar (in the circle that quenches) sprays and quenches, another section (in the pipe) is soaked in the mobile quenchant and is quenched.Its three quenchings whole process is quenched for soaking, and is provided with a slightly downward-sloping pipe, equally in the pipe into and out of quenchant liquid, realize that reinforcing bar passes in the pipe process, omnidistance soaking in mobile quenchant liquid quenched, nature should be cancelled the circle that quenches.Doing quenchant liquid with the solution that turns blue is the said dielectric fluid that turns blue, and to obtain quenching, double effects turns blue.This is because when quenching, the iron ion of steel is in upper state, is easy to separate out, and generates magnetite layer with oxygenant effect in the solution that turns blue.The solution chemistry of turning blue composition is formed, and according to weight percent the Sodium Nitrite of 65-10%, the SODIUMNITRATE of 10-65%, the saltpetre of 10-20% and excess water is arranged.If select for use the solution that turns blue based on Sodium Nitrite to quench, the chemical equation of then turning blue is:
, be described further as the test reinforcing bar with carbon steel 20.Its physical constant is blank diameter 10mm under the normal temperature, Ac
3855 ℃, M
s425 ℃, M
f270 ℃.Treating processes is such, and reinforcing bar is through alignment; With intermediate frequency inductor reinforcing bar itself is heated to 855+145=1000 ℃; The insulation zero minutes; Adopt the omnidistance operation of quenching of spraying, quenchant liquid is selected 25 ℃ of water for use, sprays the operating pressure 400kpa that quenches; Not tempering after the quenching, directly closing quotation.From accompanying drawing 1 as can be seen cooling curve (representing with arrow line the figure) drop to M
sDuring point, austenite begins to be transformed into martensite.Tempering voluntarily takes place in the martensite of Chan Shenging carbide precipitate in process of cooling subsequently at first, is cooled to M
rDuring point, austenite all becomes martensite, and finishes self-tempering.Handle the sheets thus obtained strip martensitic stucture in back and see accompanying drawing 2.
Be noted that at last; it directly is 15-60 ℃ the dielectric fluid that turns blue by temperature that present method also can be cancelled said; but adopt directly by temperature is that 15-60 ℃ one of them of water, salt solution, buck or profit done quenchant liquid and handled; obtaining same reinforcing bar metallographic structure and high-mechanical property, but its does not have the corrosion protection function is arranged.
Subordinate list 1 low carbon martensite processing machine performance table
Annotate: 1., select suitable grade of steel for use according to the mechanical performance index difference;
| Thermal treatment blank diameter (mm) | Grade of steel | Hardness HRC | Tensile strength sigma b (N/mm 2) | Yield strength σ o 2 (N/mm 2) | Unit elongation δ 10 (％) | Relative reduction in area ψ (%) |
| φ10 | 25MnSiB | 47.0 | 1637 | 1470 | 11.8 | 49.2 |
| φ10 | 20Mnsi | 41.5 | 1425 | 1215 | 9.6 | 54.7 |
| φ10 | 20MnV | 46.0 | 1499 | 1215 | 9.3 | 52.0 |
| φ10 | 20 | 44.0 | 1440 | 1264 | 9.0 | 36.0 |
2. hardness HRC40-47 is in the elastic range of spring, so reinforcing bar also has
Good elasticity.
Claims (3)
1. a high-strength building reinforcing bar is sent out prison, low-carbon martensite heat-treating process, it is characterized in that utilizing the reinforcing bar of soft steel or low-carbon alloy steel, carry out after low carbon martensite handles, it is had turn blue, the self-tempering characteristic, and high-mechanical property, its technology comprises the steps:
A. said low-carbon (LC) reinforcing bar heat itself is to Ac
3On 50-150 ℃ the time;
B. be incubated 0-10 minute;
C. in quenching process, directly be 15-60 ℃ the strong Cooling Quenching of the dielectric fluid that turns blue by temperature, with its simultaneously to the rebar surface processing of turning blue.
2. heat treating method as claimed in claim 1, it is characterized in that cancelling said directly is 15-60 ℃ the strong Cooling Quenching of the dielectric fluid that turns blue by temperature, but adopt directly by temperature is that 15-60 ℃ quenchant liquid is handled, to obtain same high-mechanical property.
3. heat treating method as claimed in claim 1 is characterized in that making it to have the self-tempering characteristic, is meant that tempering voluntarily takes place reinforcing bar in the quench cooled process, with the cancellation tempering process.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN96106625A CN1045623C (en) | 1996-06-20 | 1996-06-20 | Bluing and low-carbon martensite heat treatment of high strength building steel bar |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN96106625A CN1045623C (en) | 1996-06-20 | 1996-06-20 | Bluing and low-carbon martensite heat treatment of high strength building steel bar |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1147019A CN1147019A (en) | 1997-04-09 |
| CN1045623C true CN1045623C (en) | 1999-10-13 |
Family
ID=5119310
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN96106625A Expired - Fee Related CN1045623C (en) | 1996-06-20 | 1996-06-20 | Bluing and low-carbon martensite heat treatment of high strength building steel bar |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1045623C (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1327008C (en) * | 2005-07-07 | 2007-07-18 | 东北大学 | Post rolling fast cooling-production technology of high strength ribbed reinforced bar |
| CN100348767C (en) * | 2005-12-27 | 2007-11-14 | 东北大学 | Strength of extension 750-795 MPa grade double-phase steel plate and mfg. method thereof |
| CN1330785C (en) * | 2005-12-27 | 2007-08-08 | 东北大学 | Strength of extension 1000 MPa grade complex phase steel plate and mfg. method thereof |
| CN101693941B (en) * | 2009-08-13 | 2011-06-08 | 巨力索具股份有限公司 | Method for quenching medium and low carbon alloy structural steel workpieces |
| CN101974667A (en) * | 2010-11-16 | 2011-02-16 | 汤欣刚 | Manufacturing method of tube pile for underground foundations of high-rise buildings |
| CN103045816A (en) * | 2012-12-12 | 2013-04-17 | 张云江 | Quenching and bluing solution and using method thereof |
| CN109112260B (en) * | 2017-06-23 | 2023-04-11 | 江苏翔鹰五金弹簧有限公司 | Heat treatment method of bluing straight steel wire |
| CN110592357B (en) * | 2019-09-16 | 2021-03-26 | 中国科学院金属研究所 | A kind of heat treatment method of iron-based wear-resistant coating plow blade tip |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4314860A (en) * | 1979-09-06 | 1982-02-09 | Nippon Steel Corporation | Method for direct heat treating hot rolled steel wire rod |
| CN1061550A (en) * | 1991-01-24 | 1992-06-03 | 沈阳工业大学 | Improve cold deformation of low-carbon spiral plastic process |
-
1996
- 1996-06-20 CN CN96106625A patent/CN1045623C/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4314860A (en) * | 1979-09-06 | 1982-02-09 | Nippon Steel Corporation | Method for direct heat treating hot rolled steel wire rod |
| CN1061550A (en) * | 1991-01-24 | 1992-06-03 | 沈阳工业大学 | Improve cold deformation of low-carbon spiral plastic process |
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| Publication number | Publication date |
|---|---|
| CN1147019A (en) | 1997-04-09 |
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