High strength multi-phase steel, and method for producing a strip from said steel

US10519525B2 · kind B2 · utility

Assignee

• Salzgitter Flachstahl GmbH · DE

Inventors

• Thomas Schulz · Austin, US
• Andreas Wedemeier · Braunschweig, DE
• Michael Pohl · Villach, AT
• Hans-Joachim Kratz · Salzgitter, DE
• Matthias Geler · Langelsheim, DE
• Oliver Meyer · Ingelheim am Rhein, DE

Key dates

• Filing date: Feb 27, 2013
• Grant date: Dec 31, 2019
• Expiry date: Dec 11, 2034

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C23C2/0224
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

A high-strength multi-phase steel having tensile strengths of no less than 580 MPa, preferably with a dual-phase structure for a cold-rolled or hot-rolled steel strip having improved forming properties, in particular for lightweight vehicle construction is disclosed, containing the following elements (contents in % by mass): C 0.075 to ≤0.105; Si 0.200 to ≤0.300; Mn 1.000 to ≤2.000; Cr 0.280 to ≤0.480; Al 0.10 to ≤0.060; P ≤0.020; Nb ≥0.005 to ≥0.025; N ≥0.0100; S ≥0.0050; the remainder iron, including conventional steel-accompanying elements not mentioned above.