Nisshin Steel Co., Ltd.

Teruyoshi Iida

Takashi Yamauchi

Naoto Hiramatsu

Satoshi Suzuki

Junichi Katsuki

Kazuo Hoshino

Sadao Hirotsu

Masahiro Nishimura

A new austenitic stainless steel containing approximately 0.1-1.0 mass % of Si and not more than approximately 0.003 mass % of Al. Nonmetallic inclusions dispersed in a steel matrix are converted to MnO&#x2014;SiO&#x2014;AlOcontaining not less than approximately 15 mass % of SiOand not more than approximately 40 mass % of AlO. During steel making, molten steel is covered with basic slag and heavily deoxidized with a Si alloy whose Al content is controlled to not more than approximately 1.0 mass % in a vacuum or non-oxidizing atmosphere. The austenitic stainless steel sheet can be formed to an objective shape without the occurrence of cracking due to its decrease in susceptibility to cracking and its good formability.

Method of manufacturing austenitic stainless steel having less susceptibility to cracking during forming

A new austenitic stainless steel containing approximately 0.1-1.0 mass % of Si and not more than approximately 0.003 mass % of Al. Nonmetallic inclusions dispersed in a steel matrix are converted to MnO&mdash;SiO &mdash;Al O containing not less than approximately 15 mass % of SiO and not more than approximately 40 mass % of Al O . During steel making, molten steel is covered with basic slag and heavily deoxidized with a Si alloy whose Al content is controlled to not more than approximately 1.0 mass % in a vacuum or non-oxidizing atmosphere. The austenitic stainless steel sheet can be formed to an objective shape without the occurrence of cracking due to its decrease in susceptibility to cracking and its good formability.

Austenitic stainless steel less susceptible to cracking during forming and a manufacturing method thereof

Precipitation hardening type stainless steel comprising in % by weight, 0.03&lt;C.ltoreq.0.08, 0.3.ltoreq.Si.ltoreq.2.5, Mn.ltoreq.4.0, 5.0.ltoreq.Ni.ltoreq.9.0, 12.0.ltoreq.Cr.ltoreq.17.0, 0.1.ltoreq.Cu.ltoreq.2.5, 0.2.ltoreq.Ti.ltoreq.1.0, and Al.ltoreq.1.0, the balance being Fe and impurities, the elements being further adjusted so that

Precipitation hardening type stainless steel for spring

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Shinnanyo, Japan

Teruyoshi Iida