Low-alloy ultrahigh-strength wear-resistant steel and production method thereof

An ultra-high strength, production method technology, applied in the field of metal materials, can solve the problems of wear resistance, impact performance, plastic toughness, etc., to achieve high wear resistance, simple manufacturing and processing technology, high toughness and wear resistance. sexual effect

Inactive Publication Date: 2012-07-25
SANY GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] 1) The material is in a casting state. If the process control is not good, there may be casting defects and affect the performance; 2) The carbon content is high, and the strength can only b

Method used

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  • Low-alloy ultrahigh-strength wear-resistant steel and production method thereof
  • Low-alloy ultrahigh-strength wear-resistant steel and production method thereof
  • Low-alloy ultrahigh-strength wear-resistant steel and production method thereof

Examples

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Example Embodiment

[0057] Example one

[0058] Based on the composition and content of the aforementioned low-alloy high-strength and high-toughness steel, the first embodiment of the present invention provides a method for producing low-alloy ultra-high-strength wear-resistant steel to achieve a low-alloy ultra-high-strength wear-resistant steel with a yield strength of 1500 MPa; and The low-alloy ultra-high-strength wear-resistant steel can solve the problems of alloy chemical element content, material forming process, increase strength level, etc.; this method can break the as-cast structure and refine the crystal by large deformation forging of the as-cast material. To increase the dislocation density, increase the strength, and at the same time heal some defects formed by casting, to prevent the decrease of plastic toughness; quenching + low temperature tempering heat treatment on the forging after forging to obtain tempered sorbite structure, which can obtain ultra-high strength , While maint...

Example Embodiment

[0074] Example two

[0075] Step 1. Cast a low-alloy ultra-high-strength wear-resistant steel ingot with the composition shown in Table 1, and the size of the ingot is Φ100×110mm, and the process of melting and pouring is controlled.

[0076] Table 1 Chemical composition of low alloy steel (wt%)

[0077] C

[0078] Step 2. Forging the ingot obtained in Step 1.

[0079] In the embodiment of the present invention, the billet forging heating temperature is 1160-1200°C, the final forging temperature is 700°C, the deformation per fire is not less than 30%, and the forging cross-sectional specification is 16×80 mm.

[0080] Step 3. The forging obtained in step 2 is heated to 920°C, kept for 3 hours, and cooled to room temperature in air; this process is a normalizing process.

[0081] Step 4. The forging obtained in step 3 is heated to 900° C., kept for 2 hours, and rapidly cooled to room temperature in water; this process is a quenching process.

[0082] Step 5. The forging obtained in st...

Example Embodiment

[0088] Example three

[0089] Step 1. Cast a low-alloy ultra-high-strength wear-resistant steel ingot with the composition shown in Table 3, and the size of the ingot is Φ100×110mm, and the process of melting and pouring is controlled.

[0090] Table 3 Chemical composition of low alloy steel (wt%)

[0091] C

[0092] Step 2. Forging the ingot obtained in Step 1.

[0093] In the embodiment of the present invention, the billet forging heating temperature is 1160-1200°C, the final forging temperature is 750°C, the deformation per fire is not less than 30%, and the cross-sectional specification of the forging is 16×80 mm.

[0094] Step 3. The forging obtained in step 2 is heated to 930° C., kept for 3 hours, and cooled to room temperature in air; this process is a normalizing process.

[0095] Step 4. The forging obtained in step 3 is heated to 920°C, kept for 2 hours, and rapidly cooled to room temperature in water; this process is a quenching process.

[0096] Step 5. The forging obtai...

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Abstract

The invention discloses low-alloy ultrahigh-strength wear-resistant steel and a production method of the wear-resistant steel, wherein the production method comprises a casting procedure of casting the following components by weight percentage to obtain ingots of low-alloy steel: 0.20-0.35wt% of C, 0.30-0.70wt% of Si, 0.60-1.00wt% of Mn, 0.70-1.10wt% of Cr, 0.60-1.00wt% of Ni, 0.30-0.70wt% of Mo, and the balance of Fe and other inevitable impurities; a forging procedure of forging the ingots of the low-alloy steel by controlling the cogging, forging and heating temperature to be 1160-1200 DEG C and the final forging temperature to be 650-900 DEG C while keeping the deformation at each heating number being not less than 30%; and a thermal processing procedure of heating the forged-formed forge piece to 900-940 DEG C for normalization, afterwards heating the forge piece to 880-920 DEG C for quenching, and heating to 150-220 DEG C to implement low-temperature tempering so as to obtain the low-alloy ultrahigh-strength wear-resistant steel. According to the embodiment of the invention, the low-alloy ultrahigh-strength wear-resistant steel has high strength, high ductility and high wear resistance.

Description

technical field [0001] The invention relates to the field of metal materials, in particular to a low-alloy ultra-high-strength wear-resistant steel and a production method thereof. Background technique [0002] At present, the yield strength of steel used in construction machinery is generally below 900MPa, especially the high-quality carbon low-alloy steel represented by Q235, Q345, and Q460 is used in a large amount; and with the worsening working conditions and comprehensive performance requirements With the improvement of construction machinery, the manufacturing of construction machinery is developing in the direction of high parameterization, large-scale and lightweight, and the demand for high-strength steel, even ultra-high-strength steel in construction machinery is becoming stronger and stronger, and there is also an urgent need to improve wear resistance . [0003] In the prior art, a low-alloy steel for manufacturing crawler crane track shoes and a preparation m...

Claims

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Application Information

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IPC IPC(8): C22C38/44C21D8/02C21D1/18C21D1/28
Inventor 李杰王文明刘永红
Owner SANY GRP
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