Hot-rolled steel strip and method of making it

US6284063A · kind A · utility

Assignee

• Thyssen Stahl AG · DE

Inventors

• Manfred Espenhahn · Essen, DE
• Thomas Heller · Pittsburgh, US
• Jurgen Esdohr · Alpen, DE

Key dates

• Filing date: Feb 25, 1999
• Grant date: Sep 4, 2001
• Expiry date: Feb 25, 2019

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C21D2211/008
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

The invention concerns hot-rolled steel strip no more than 5 mm thick, optionally less than 2 mm thick, made of high-tensile steel, that contains 0.08%-0.25% carbon, 1.20% to 2.0% manganese, and 0.02% to 0.05% aluminum, and optionally up to 1.0% chromium, up to 0.1% copper, up to 0.5% molybdenum, up to 0.1% nickel, up to 0.009% nitrogen, up to 0.0025% B, and optionally a stoichiometric amount of titanium in relation to nitrogen. The steel strip has a greater than 95% martensitic structure, and a tensile strength of 800 to 1400 N/mm.sup.2.