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
CN105839028AActive Publication Date: 2016-08-10宝钢特钢长材有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
宝钢特钢长材有限公司
Publication Date
2016-08-10

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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.
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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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