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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 be unilaterally improved, which may affect the plasticity and toughness accordingly; 3 ) The strength level is not enough, and the wear resistance is affected; 4) The cost of vacuum melting is high

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

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Embodiment 1

[0058]Based on the composition and content of the above-mentioned low-alloy high-strength and high-toughness steel, Embodiment 1 of the present invention provides a production method of 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, and increase the strength level; the method performs large-deformation forging on the as-cast material, and the forging can break the as-cast structure and refine the grain size. grains, increase dislocation density, improve strength, and heal some defects formed by casting to prevent the decrease of plasticity and toughness; after forging, quenching + low-temperature tempering heat treatment is carried out to obtain tempered sorbite structure, which can obtain ultra-high strength , while maintaining a certa...

Embodiment 2

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

[0076] Table 1 Low alloy steel chemical composition (wt%)

[0077] C

[0078] Step 2, forging the ingot obtained in step 1.

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

[0080] Step 3. Heating the forging obtained in step 2 to 920° C., keeping it warm for 3 hours, and cooling to room temperature in the air; this process is a normalizing process.

[0081] Step 4. Heating the forged piece obtained in Step 3 to 900° C., keeping it warm for 2 hours, and rapidly cooling to room temperature in water; this process is a quenching treatment proc...

Embodiment 3

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

[0090] Table 3 Chemical Composition of Low Alloy Steel (wt%)

[0091] C

S

P

mn

Si

Cr

Ni

Mo

Al

La

0.20

0.005

0.022

0.78

0.62

0.95

0.93

0.66

0.042

0.0013

[0092] Step 2, forging the ingot obtained in step 1.

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

[0094] Step 3. Heating the forging obtained in step 2 to 930° C., keeping it warm for 3 hours, and cooling to room temperature in the air; this process is a normalizing process...

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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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