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Martensite heat-resisting steel

A heat-strength steel, martensite technology, applied in heat treatment equipment, heat treatment process control, manufacturing tools, etc., can solve the problems of poor weldability, easy failure, stress corrosion sensitivity, etc., to achieve high corrosion resistance, improve tensile strength and yield limit, the effect of improving hot hardness

Inactive Publication Date: 2007-10-31
SHENYANG LIMING AERO-ENGINE GROUP CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its disadvantages are (1) poor weldability, heat treatment must be carried out in time after welding
(2) Sensitive to stress corrosion, parts are prone to failure under long-term stress

Method used

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  • Martensite heat-resisting steel
  • Martensite heat-resisting steel
  • Martensite heat-resisting steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] It can be seen from the metallographic photos that the original structure of OCr11Ni2MoVNb in the present invention is tempered martensite, and the grain size is about 9 to 10 grades. From the uneven color of metallography, some parts are martensite or low temperature tempered martensite. fire martensite. Figures 1 to 4 show the performance comparison between the 10Cr11Ni2MoVNb alloy rod and the 1Cr11Ni2W2MoV alloy rod in the example. It can be seen from Figures 1 to 4 that after the material is quenched at 1010°C, when it is tempered above 620°C, the 0Cr11Ni2MoVNb alloy Tensile strength, reduction of area and hardness are all higher than 1Cr11Ni2W2MoV alloy; when it is tempered above 590°C, the elongation of 1Cr11Ni2W2MoV alloy is greater than that of 0Cr11Ni2MoVNb alloy; when tempered above 600°C, the yield strength of 0Cr11Ni2MoVNb alloy is high In 1Cr11Ni2W2MoV alloy.

Embodiment 2

[0048] The embodiment 20Cr11Ni2MoVNb alloy and 1Cr11Ni2W2MoV alloy were subjected to salt spray corrosion test in 5% NaCl aqueous solution, and the corrosion resistance of 0Cr11Ni2MoVNb alloy was better than that of 1Cr11Ni2W2MoV alloy.

[0049] The influence of quenching temperature on mechanical properties is shown in Figures 5 and 6. With the increase of quenching temperature, the tensile strength and yield strength increase. After exceeding the upper limit quenching temperature (1050°C) specified in the technical conditions, the strength continues to increase, but the plasticity is slightly decline.

[0050] The comparison of the influence of tempering temperature on mechanical properties at each quenching temperature is shown in Figures 7-12. It can be seen that with the increase of tempering temperature, the strength decreases, the plasticity changes little, and the impact value increases. It can be seen from Figure 7 that under quenching at a lower temperature of 1010°...

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Abstract

The invention discloses a martensite heat-resisting steel, which is characterized by the following: setting main constituent of the alloy as 0. 05-0. 09 C, 10. 5-12. 0 Cr, 1. 40-1. 80 Ni, 0. 35-0. 50 Mo, 0. 15-0. 25 V, 0. 05-0. 15 Nb, not more than 0. 60 Si, not more than 0. 60 Mn, not more than 0. 020, not more than 0. 030 P, not more than 0. 30 Cu and surplus as Fe. This alloy possesses higher intensity good ductibility and corrosion resistance.

Description

Technical field: [0001] The invention relates to a martensitic heat-strength steel that can be used for a long time below 600°C. Background technique: [0002] 1Cr11Ni2W2MoV alloy, the composition is, weight percentage: C0.10~0.16, Cr10.5~12.0, Ni1.40~1.80, Mo0.35~0.50, V0.18~0.30, Si≤0.60, Mn≤0.60, S≤0.020 , P≤0.030, Cu≤0.30, W0.70~1.00, Fe balance, is a martensitic heat-strength stainless steel, the steel has high room temperature strength and durable strength, and has good toughness and oxidation resistance , has good corrosion resistance in fresh water and humid air. This steel is suitable for the manufacture of load-bearing parts that work under 550°C and under humid conditions. Its disadvantages are (1) poor weldability, and heat treatment must be carried out in time after welding. (2) Stress corrosion is sensitive, and parts are prone to failure under long-term stress. Invention content: [0003] The purpose of the present invention is to provide a martensitic h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/48C21D1/18C21D11/00
Inventor 马凤春史凤岭方波魏明霞杨钢王立民吴佩林
Owner SHENYANG LIMING AERO-ENGINE GROUP CORPORATION