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Low-alloy heat-resistant high-strength steel and steel member and preparation methods thereof

A high-strength steel, low-alloy technology, applied in the field of iron and steel materials, can solve the problems of high production cost, complex impurity composition, and various metal types, and achieve the effect of high room temperature tensile strength

Active Publication Date: 2015-05-20
上海闵轩钢结构工程有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it contains many types of metals, the production cost is high, and the impurity components that may be produced are also relatively complex.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A low-alloy heat-resistant high-strength steel and components thereof, which are prepared through the following steps,

[0027] (1) Design the composition of the low-alloy heat-resistant high-strength steel, in weight percentage (%), including: C 0.05, Si 0.1, Mn 0.2, Cr 1.2, Pd 0.4, P0.009, S0.006, Ni 0.3, Cu 0.05, V 0.35, Nb 0.15, W 0.3, Ti 0.01, the balance is Fe and unavoidable impurities;

[0028] (2) Smelting pouring, including electric arc furnace primary smelting, ladle RH treatment and LF treatment, pouring after controlling molten steel to meet the chemical composition requirements, in which argon blowing is carried out at a pressure of 5 atm for 5 minutes during ladle refining to facilitate the floating and removal of impurities ;

[0029] (3) Rolling, including soaking treatment, rolling and cooling, wherein soaking treatment is soaking in a heating furnace at 1130°C for 5 hours, the rolling start temperature is 1050°C, the final rolling temperature is 860°...

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PUM

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Abstract

The invention relates to low-alloy heat-resistant high-strength steel and a steel member and preparation methods thereof. The low-alloy heat-resistant high-strength steel comprises the following components in percentage by weight: 0.04-0.06% of C, 0.06-0.2% of Si, 0.06-0.35% of Mn, 1.3-1.5% of Cr, 0.35-0.45% of Pd, less than or equal to 0.009% of P, less than or equal to 0.006 of S, 0.2-0.4% of Ni, 0.01-0.08% of Cu, 0.3-0.4% of V, 0.1-0.2% of Nb, 0.2-0.5% of W, 0.005-0.02% of Ti and the balance of Fe and unavoidable impurities. The low-alloy heat-resistant high-strength steel member prepared from the low-alloy heat-resistant high-strength steel has the advantages of higher room temperature tensile strength, yield point and surface hardness.

Description

technical field [0001] The invention relates to a steel material, in particular to a low-alloy heat-resistant high-strength steel, a steel component and a preparation method thereof. Background technique [0002] Under high temperature conditions (usually 0.3 to 0.5 times the melting point of the material), the steel with oxidation resistance, sufficient high temperature strength and good heat resistance is called heat-resistant steel, and the most representative of heat-resistant steel One is low-alloy heat-resistant high-strength steel. For example, 15CrMo in my country is a typical low-alloy heat-resistant high-strength steel. 15CrMo is widely used in boilers, petroleum Pipelines, containers, components, etc. of large-scale equipment with harsh service conditions and complex corrosive media such as chemical industry, coal conversion, steam turbine cylinder block, thermal power, and nuclear power. [0003] General 15CrMo chemical composition (mass fraction) (%) is: C 0.12~0...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/50C21D8/00
CPCC21D8/0226C22C38/002C22C38/02C22C38/04C22C38/08C22C38/12C22C38/14C22C38/16C22C38/18
Inventor 夏学云宋国新
Owner 上海闵轩钢结构工程有限公司
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