Tough ultra-strength stainless steel and method for manufacturing the same

A technology of ultra-high strength and manufacturing method, which is applied in the field of stainless steel materials, can solve the problems of low toughness and low yield ratio, and achieve the effect of increasing yield strength, improving yield strength and improving corrosion resistance

Inactive Publication Date: 2008-06-25
宝钢特钢有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The purpose of the present invention is to provide a kind of strong toughness ultra-high strength stainless steel and its manufacturing method, by adopting the technical measures of optimizing chemical composition design, strengthening double vacuum s

Method used

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  • Tough ultra-strength stainless steel and method for manufacturing the same
  • Tough ultra-strength stainless steel and method for manufacturing the same
  • Tough ultra-strength stainless steel and method for manufacturing the same

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Example Embodiment

[0050] An embodiment of the present invention is as follows,

[0051] 1. Master alloy preparation, select high-purity iron and metallic chromium, and use electric furnace + argon oxygen refining furnace (AOD) + ladle refining (LF) compound refining method to prepare master alloy as raw material for vacuum induction furnace;

[0052] 2. Vacuum induction furnace (VIM) melting electrodes,

[0053] Select high-purity metallic nickel, metallic chromium, metallic cobalt, metallic niobium or ferroniobium, metallic molybdenum or ferro-molybdenum, metallic tungsten or ferro-tungsten, and iron alumite, and select master alloys; the charge is strictly in accordance with the control target Limited allocation; pay special attention to the introduction of Si, Al, and Cu to prevent exceeding the limit; pouring Φ290 electrode, demoulding and air cooling for more than 6 hours; electrode remelting after finishing;

[0054] 3. Vacuum arc remelting (VAR) consumable remelting process

[0055] The mold...

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Abstract

The invention discloses a high-flexibility high-strength stainless steel and a method for making the same, wherein the method comprises the following steps of: 1) preparing parent alloy, the chemical compositions by weight percentage of which are: less than or equal to 0.03 percent of C, less than or equal to 0. 10 percent of Mn, less than or equal to 0.10 percent of Si, less than or equal to 0.002 percent of S, less than or equal to 0.006 percent of P, 6.0 to 13.0 percent of Cr, less than or equal to 0.05 percent of Al, less than or equal to 0.10 percent of Cu, less than or equal to 0.05 percent of Ti, the balance Fe and unavoidable impurities; 2) melting an electrode with a vacuum induction furnace, in which the parent alloy is prepared with pure iron, nickel, and other metal material for melting the electrode; 3) vacuum consumable remelting, at a melting speed of between 180 and 220 Kg/h; 4) forging, in which steel ingots are heated at a temperature of 1180+-20 DEG C, with the temperature maintained for 3 to 6 hours, and are upset and drawn twice, and the forging temperature is above 850 DEG C. The stainless steel of the invention has matched combination properties including 1800Mpa strength, 1400 Mpa yield strength, 50J impact ductility, more than 100 Mpa fracture toughness.

Description

Technical field [0001] The invention relates to stainless steel material technology, in particular to strong and tough ultra-high-strength stainless steel and a manufacturing method thereof. Background technique [0002] At present, domestic and even international aerospace advanced precision machines have many parts (such as high-load bearing parts, rolling element parts, high-pressure shells, fasteners, etc.) that are matched with ultra-high strength and sufficient toughness. High-strength steel. [0003] The mechanical properties of high-strength structural steel can meet the requirements, but the rust resistance and stress corrosion fracture toughness are very poor, which seriously affects the storage and service life of steel and parts. Such materials include low-alloy, medium-alloy and high-alloy structural steels. The chromium content of various materials does not exceed 5%, and there is no corrosion resistance. [0004] High-strength stainless steel, mainly precipitation ...

Claims

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Application Information

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IPC IPC(8): C22C38/52C22C33/06C21D8/00B21J1/06
CPCY02P10/20
Inventor 姚长贵徐惠松王敏方静贤罗辉杨桦陈志辉陈杰卫权刘金生廖洪军
Owner 宝钢特钢有限公司
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