Martensitic stainless steel article and method for producing...

Details Martensitic stainless steel article and method for producing... Martensitic stainless steel article and method for producing...

C - Chemistry, Metallurgy

21

D

C21D 1/22 (2006.01) C22C 38/42 (2006.01) C22C 38/44 (2006.01) C22C 38/58 (2006.01)

Patent

CA 2061765

ABSTRACT A martensitic stainless steel article having an improved combination of strength, toughness, corrosion resistance and machinability. The article is particularly adapted for use in the manufacture of holder blocks, frames, backers and similar articles for anchoring molds and dies. The carbon and nitrogen content of the article are controlled to achieve the desired hardness. Sulfur is controlled in accordance with carbon plus nitrogen to maintain the required machinability of the article. Chromium and nickel are present for maintaining corrosion resistance, along with molybdenum, which also counteracts any adverse effects of increased sulfur content. The article may be austenitized at a temperature within the of 1500 to 1750°F for about 1 hour per inch of thickness and either oil quenched or air cooled to achieve a martensitic structure. Thereafter, the article may be tempered or stress-relieved at a temperature between 500 and 850°F for about 1 hour per inch of thickness and for a minimum of 2 hours. After these heat treatments, the article will exhibit a hardness within the range of 30 to 40 HRC, preferably 35 to 40 HRC for higher strength applications, along with a drill machinability rating equal to or greater than 100.

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