Chromium steel sheets having an excellent press formability

US5709836A · kind A · utility

Assignee

• Kawasaki Steel Corporation · JP

Inventors

• Mitsuyuki Fujisawa · Tokyo, JP
• Yasushi Kato · Kizugawa, JP
• Takumi Ujiro · Tokyo, JP
• Susumu Satoh · Chiba, JP
• Koji Yamato · Chiba, JP

Key dates

• Filing date: Feb 28, 1996
• Grant date: Jan 20, 1998
• Expiry date: Feb 28, 2016

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C22C38/32
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

A chromium steel sheet having excellent press formability, particularly deep-drawing formability and resistance to secondary work brittleness. The construction is a chromium steel sheet including C: not more than 0.03 wt %, Si: not more than 1.0 wt %, Mn: not more than 1.0 wt %, P: not more than 0.05 wt %, S: not more than 0.015 wt %, Al: not more than 0.10 wt %, N: not more than 0.02 wt %, Cr: 5-60 wt %, Ti: 4(C+N)-0.5 wt %, Nb: 0.003-0.020 wt %, B: 0.0002-0.005 wt %, and, if necessary, one or more selected from Mo: 0.01-5.0 wt %, Ca: 0.0005-0.01 wt % and Se: 0.0005-0.025 wt %, and the balance being Fe and inevitable impurities.