New Manufacturing Process of Nickel-Free Austenitic Stainless Steel with Nitrogen Absorption Treatment

Ingots of ferritic stainless steels, Fe-24Cr and Fe-24Cr-2Mo in mass%, were worked to various dimensions for test specimens. Nitrogen was absorbed by the specimens in a furnace filled with nitrogen gas with a pressure of 101.3 kPa at 1473 K to develop a simple and convenient manufacturing process of nickel-free austenitic stainless steels. Ferritic Fe-24Cr and Fe-24Cr-2Mo were austenitized with nitrogen absorption to a 2-mm depth from the surface. The hardness, tensile strength, 0.2% proof stress, and elongation to fracture increased, and the reduction of area decreased in the alloys by austenitization due to nitrogen absorption. The tensile strength and 0.2% proof stress of these alloys with nitrogen absorption for 129.6 ks were much larger than those of 316L steel, while the elongation to fracture was much smaller than that of 316L steel. Therefore, small devices and parts with a maximum thickness or diameter of 4 mm were manufactured with this process in this study

[1]  T. Hanawa,et al.  Mutagenicity evaluation of forty-one metal salts by the umu test. , 2002, Journal of biomedical materials research.

[2]  Terry N. Faddis,et al.  Flute engagement in peripheral milling , 2001 .

[3]  P. Zapp.  Material Corrosion and Plate-Out Test of Types 304L and 316L Stainless Steel , 2001 .

[4]  T. Meinertz,et al.  Nickel and molybdenum contact allergies in patients with coronary in-stent restenosis , 2000, The Lancet.

[5]  T. Tsuchiyama,et al.  Fabrication of high nitrogen austenitic stainless steels by powder metallurgy , 1999 .

[6]  Surgical implants and other foreign bodies. , 1999, IARC monographs on the evaluation of carcinogenic risks to humans.

[7]  T. Kaku,et al.  Corrosion Resistance and Biocompatibility of High Nitrogen-bearing Stainless Steels , 1998 .

[8]  A. Yamamoto,et al.  Cytotoxicity evaluation of 43 metal salts using murine fibroblasts and osteoblastic cells. , 1998, Journal of biomedical materials research.

[9]  J. Menzel,et al.  High Nitrogen Containing Ni-free Austenitic Steels for Medical Applications , 1996 .

[10]  Peter J. Uggowitzer,et al.  Nickel Free High Nitrogen Austenitic Steels , 1996 .

[11]  S. Takaki,et al.  Structural Control of Stainless Steel by Nitrogen Absorption in Solid State , 1996 .

[12]  S. Takaki,et al.  Microstructural Change with Nitrogen Absorption in Ferritic Stainless Steel Powder Compacts , 1996 .

[13]  R. Goyer,et al.  Toxicology of Metals , 1995, Handbook of Experimental Pharmacology.

[14]  S. Takaki,et al.  Effect of Pores on Nitriding Behavior of 12mass%Cr Ferritic Steel Compacts , 1994 .

[15]  S. Takaki,et al.  Nitriding and Sintering Mechanisms of 12%Cr Ferritic Stainless Steel Powder Compacts in Nitrogen Atmosphere , 1993 .

[16]  M. Jarl,et al.  A Thermodynamic analysis of the Fe-Cr-N system , 1987 .

[17]  S. Degallaix,et al.  Mechanical behaviour of high-nitrogen stainless steels , 1986 .