CN1078626C - High-silicon abrasion resistant cast steel - Google Patents

Abstract

The invention relates to a method for manufacturing high-silicon wear-resistant cast steel, which uses carbon steel scraps or silicon steel scraps as raw materials, uses waste electrode graphite and other recarburizers to increase carbon, increases silicon with ferrosilicon alloy or SiC, and alloys molybdenum alloys , Control the composition of molten steel; heat treatment the casting workpiece. This wear-resistant cast steel can work under impact wear conditions, has higher initial hardness than high-manganese steel, and still has good wear resistance under wear conditions of medium and small impact loads; High wear resistance and toughness, wider application area; less alloying elements are used than low alloy steel, heat treatment is simplified, cost is reduced, and wear resistance is improved.

Description

A kind of manufacture method of high-silicon abrasion resistant cast steel

The present invention relates to a kind of manufacture method of high-silicon abrasion resistant cast steel, belong to metallurgical technology field.

Existing casting wear-resistant steel mainly contains high mangaenese steel, carbon steel and low alloy steel, and casting graphitized steel three classes ^[1-3]Wherein most widely used general in the high mangaenese steel of invention in 1882 with British Hadfield.The maximum characteristics of this steel are, under bigger shock load or contact stress effect, upper layer can produce work hardening rapidly, and are inner then still maintain good toughness.Therefore has good wear resistance.But in shock load or the not too high occasion of contact stress, this sclerosis effect that adds can not be given full play to, because the initial hardness of high mangaenese steel is very low, thereby wear resistance is very poor.

Carbon steel and low alloy steel mainly grows up as structured material rather than as wear resisting steel, and in order to improve wear resistance, adopting multi-element alloyed and strict thermal treatment is major measure, thereby cost is higher.

The casting graphitized steel is then substituted by spheroidal graphite cast iron, and in the wearing and tearing occasion that graphitized steel is suitable for, spheroidal graphite cast iron has better wear resistance.

Austria that developed recently gets up-shellfish magnesium iron (ADI) has good obdurability combination, is a kind of good high-abrasive material.But in the gouging abrasion occasion, the graphite among the ADI is inoperative.In addition, the carbon content basic fixed of matrix among the ADI is adjusted difficulty.

The objective of the invention is to study a kind of manufacture method of high-silicon abrasion resistant cast steel, it can be worked under the gouging abrasion condition, have higher initial hardness than high mangaenese steel, the wear resistance that under the abrasive conditions of middle or small shock load, still has; Have higher wear resistance and obdurability than Austria-shellfish magnesium iron, applicable surface is bigger; Lack than low alloy steel and to use alloying element, simplify thermal treatment, reduce cost, and improve wear resistance.

The composition prescription of the manufacture method of a kind of high-silicon abrasion resistant cast steel of the present invention's development is as follows: C Si Mn P S Mo0.6～1.2 1.8～3.0 0.4～0.6＜0.04＜0.04 0.2～0.5

Its preparation technology is as follows:

1. founding

Can adopt power frequency, medium-frequency induction furnace or arc melting, starting material are the carbon steel tankage, also can adopt the silicon steel tankage, and with spent cathodes graphite and other carburelant carburetting, ferro-silicon or SiC increase silicon, the molybdenum alloy alloying.Melting technology and general carbon steel with, but inclusion is wanted strict control;

2, with above-mentioned molten steel casting finished product workpiece;

3, the casting workpiece is heat-treated:

With the heating of≤100 ℃/speed at one hour rating, at 900 ± 20 ℃ of following austenitizings, soaking time 1～3 hour (every 2.5cm wall thickness 1 hour) is then at salt bath furnace (KON ₃50%+NaON ₃50%) quench in, quenching temperature is 280～400 ℃, 0.5～1.5 hour time.

At a large amount of medium and small ball grinding machine lining boards that use of China, excavator bucket teeth, grinder hammerhead, railway screen scarifier are taken off on the part such as chain and are used, and new steel grade should be realized improving work-ing life than existing material, the purpose that production cost reduces.

Introduce embodiments of the invention below.

(tooth weighs 4～6kg) materials: C 0.7 to excavator bucket teeths such as embodiment 1:PC200, PC220 for intermediate frequency furnace melting, investment cast; Si 2.3～2.7; Mn 0.4～0.6; P, S＜0.04; Mo 0.20～0.30.

Thermal treatment: 900 ± 10 ℃ of austenitizings, 320 ℃ of isothermal quenching 1 hour.

Effect: bucket tooth work-ing life improves about 50% than former 35CrMo bucket tooth, improve more than 2 times than 45# carbon steel bucket tooth, and production cost is lower than 35CrMo, and is slightly higher than 45# carbon steel.

Embodiment 2: (tup weighs 6～10kg) to the plate-hammer crusher tup for intermediate frequency furnace melting, sand casting

Material: C 0.9～1.0; Si 2.2～2.5; Mn 0.4～0.6; P, S＜0.04; Mo 0.20～0.30.

Thermal treatment: 900 ± 10 ℃ of austenitizings, 360 ℃ of isothermal quenching 1.5 hours.

Effect: tup improves more than 1 times than former high mangaenese steel tup work-ing life.

Embodiment 3: railway screen scarifier is taken off chain, and (chain weighs 7～12kg) for intermediate frequency furnace melting, sand casting

Material: C 0.8～1.0; Si 2.0～2.2; Mn 0.4～0.6; P, S＜0.04; Mo 0.20～0.30.

Thermal treatment: 900 ± 10 ℃ of austenitizings, 280～300 ℃ of isothermal quenching 1 hour.

Effect: take off chain and take off the chain raising more than 1 times than former high mangaenese steel work-ing life.

Claims (1)

1, a kind of manufacture method of high-silicon abrasion resistant cast steel, it is characterized in that its composition prescription is as follows: C Si Mn P S Mo0.6～1.2 1.8～3.0 0.4～0.6＜0.04＜0.04 0.2～0.5

Its preparation technology is as follows:

(1) founding

Adopting power frequency, medium-frequency induction furnace or arc melting, is raw material with carbon steel tankage or silicon steel tankage, and with spent cathodes graphite and other carburelant carburetting, ferro-silicon or SiC increase silicon, molybdenum alloy alloying, the composition of control molten steel;

(2), with above-mentioned molten steel casting finished product workpiece;

(3), the casting workpiece is heat-treated:

With the heating of≤100 ℃/speed at one hour rating, at 900 ± 20 ℃ of following austenitizings, soaking time 1～3 hour (every 2.5cm wall thickness 1 hour) is then at salt bath furnace (KON ₃50%+NaON ₃50%) quench in, quenching temperature is 280～400 ℃, 0.5～1.5 hour time.