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Austenite heat-resistant valve steel and manufacturing method thereof

A manufacturing method and technology of valve steel, which is applied in the field of austenitic heat-resistant valve steel and its manufacture, can solve the problems of easy corner cracking, poor performance, surface cracking and other problems of steel, and achieve the effect of improving efficiency and power requirements

Active Publication Date: 2016-08-10
宝钢特钢长材有限公司
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Problems solved by technology

[0010] Aiming at the problem that 21-4NWNb steel is prone to corner cracking, surface cracking and poor performance in the prior art, the purpose of the present invention is to provide austenitic heat-resistant valve steel and its manufacturing method

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  • Austenite heat-resistant valve steel and manufacturing method thereof
  • Austenite heat-resistant valve steel and manufacturing method thereof
  • Austenite heat-resistant valve steel and manufacturing method thereof

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Embodiment Construction

[0026] The technical solution of the present invention will be further described below in conjunction with the drawings and embodiments.

[0027] In order to solve the problems of cracks, skins and folds that are easy to occur in the process of producing bars (diameter greater than 14mm) or wires (diameters between 5.5-14mm) from 21-4NWNb steel large ingots, improve the difficulty of straightening and increase the finished product The present invention proposes to add alloy elements to improve high temperature thermoplasticity on the basis of the composition of 21-4NWNb steel, and select reasonable production process parameters based on the results of thermal simulation tensile tests. The main content and technical features of the present invention are as follows:

[0028] The chemical composition (mass percentage) is:

[0029] C 0.45-0.55%, Si 0.08-0.45%, Mn 8.00-10.00%, Cr 20.00-22.00%, Ni 3.50-5.00%, Cu≤0.30%, W 0.80-1.50%, N 0.45-0.55%, Nb1.80 -2.50%, Al≤0.02%, Mg≤0.010%, Ca 0....

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Abstract

The invention discloses austenite heat-resistant valve steel and a manufacturing method thereof. The steel comprises the following components, by mass percentage, 0.45-0.55% of C, 0.08-0.45% of Si, 8.00-10.00% of Mn, 20.00-22.00% of Cr, 3.50-5.00% of Ni, no more than 0.30% of Cu, 0.80-1.50% of W, 0.45-0.55% of N, 1.80-2.50% of Nb, no more than 0.02% of Al, no more than 0.010% of Mg, 0.001-0.01% of Ca, 0.001-0.006% of B, and 0.005-0.020% of RE, with the balance being Fe and inevitable impurities, wherein C+N>=0.09, Nb / C is in a range of 2-5, and (Mn+Si)>=200. The manufacturing method mainly comprises smelting, casting, blooming, rolling, complete solution and aging treatment.

Description

Technical field [0001] The invention relates to a steel material with good hot workability and a manufacturing method thereof, and more specifically, to austenitic heat-resistant valve steel and a manufacturing method thereof. Background technique [0002] 21-4NWNb (5Cr21Mn9Ni4Nb2WN) steel is a kind of high-strength austenitic valve steel developed by European and American countries on the basis of 21-4N (5Cr21Mn9Ni4N) steel. It is mainly used to manufacture exhaust valves for high-load engines. The temperature is 700~850℃. It has good high temperature strength, high heat stress fatigue resistance, good high temperature wear resistance and high temperature gas corrosion resistance. This steel has been included in the valve steel standards of various countries. For example, my country's national standard GB / T12773-2008 "Valve Steel and Superalloy Bars for Internal Combustion Engines" also has a specific description of this steel. Moreover, as China implements stricter standards f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/58C21D8/06C22C33/06
Inventor 周灿栋方静贤李瀑顾新根赵欣庄伟徐松乾赵海平
Owner 宝钢特钢长材有限公司
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