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High strength abrasion resistant steel and method for producing the same

A technology of high-strength wear-resistant steel and a manufacturing method, applied in the field of alloy steel, can solve the problems of increased production cost of wear-resistant steel, formation of hydrogen accumulation in parts, lack of refining process, etc., and achieves low production cost, stable internal quality, excellent quality high intensity effect

Active Publication Date: 2009-01-07
ZHEJIANG DESHENG RAILWAY EQUIP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, experiments have proved that the addition of the main alloying element Ni has no obvious effect on improving the performance of wear-resistant steel, and because Ni alloy materials are expensive, it will also lead to an increase in the production cost of wear-resistant steel
In addition, due to the lack of refining process in the manufacturing process of wear-resistant steel, especially the lack of measures to remove harmful gas hydrogen, there is a possibility of hydrogen accumulation inside the product, so that the product has delayed cracking that poses a great hazard to railway transportation.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] The chemical composition and content are proportioned according to the following weight percentages:

[0045] C 0.27, Si 0.8, Mn 1.0, Cr 1.1, Mo 0.35, V 0.17, Ti 0.09, P≤0.03, S≤0.025.

[0046] After deformation oil quenching, temper at 480 to obtain tempered sorbite structure.

[0047] The mechanical properties are as follows:

[0048] Intensity σ b =1410Mpa, hardness HRC=43, impact toughness α ku =51J / cm 2 , elongation δ 5 = 10%.

Embodiment 2

[0050] The chemical composition and content are proportioned according to the following weight percentages:

[0051] C 0.36, Si 1.1, Mn 1.2, Cr 1.2, Mo 0.4, V 0.18, Ti 0.08, P≤0.03, S≤0.025.

[0052] After deformation normalizing, temper at 380°C to obtain bainite + retained austenite structure.

[0053] The mechanical properties are as follows:

[0054] Intensity σ b =1420Mpa, hardness HRC=42, impact toughness α ku =65J / cm 2 , elongation δ 5 = 9.5%.

Embodiment 3

[0056] The chemical composition and content are proportioned according to the following weight percentages:

[0057] C 0.45, Si 0.7, Mn 0.8, Cr 1.15, Mo 0.36, V 0.19, Ti 0.10, P≤0.03, S≤0.025.

[0058] After deformation oil quenching, temper at 520°C to obtain tempered sorbite structure.

[0059] The mechanical properties are as follows:

[0060] Intensity σ b =1620Mpa, hardness HRC=48, impact toughness α ku =50J / cm 2 , elongation δ 5 = 9%.

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Abstract

The present invention relates to a high strength and wear resistant steel and its production process, which is particularly suitable for application in railway intersections. The compositions (wt%) are : C 0.25-0.55, Si 0.6-1.5,Mn 0.8-1.5,Cr 1-1.5,Mo 0.3-0.5, V 0.15-0.25, Ti 0.05-0.15, P<=0.03, S<=0.025. The production flow sheet is as follows: refining by arc furnace - refining by vacuum furnace - ladle refining outside of furnace - casting ingot - primary rolling in billet - forging in form - deforming heat treatment. As compared with the existing technologies, the present steel has the advantages of excellent wear resistance, high strength, high toughness, stable quality and low production cost.

Description

technical field [0001] The invention relates to alloy steel, in particular to a high-strength wear-resistant steel that can be used for railway turnouts and a manufacturing method thereof. Background technique [0002] With the development of railway transportation towards heavy load and high speed, higher requirements are put forward for the materials and inherent quality of railways. The high-manganese steel turnouts in active service have become more and more difficult to meet the needs of heavy-duty and high-speed development of railway transportation, especially for turnout core rails with harsh service conditions, which must not only have sufficient wear resistance, but also require sufficient strength and toughness. Should have a stable inner quality. For this reason, both at home and abroad are trying to develop high-performance wear-resistant steel that can meet the requirements of heavy-duty and high-speed railway transportation. For example, the application numbe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/18C22C33/04B22D7/00B21B1/02B21J5/00C21D9/04
Inventor 关铁
Owner ZHEJIANG DESHENG RAILWAY EQUIP
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