Flat steel product with an Al-coating, method for producing the same, steel component and method for producing the same

US10669603B2 · kind B2 · utility

Assignees

• ThyssenKrupp Steel Europe AG · DE
• thyssenkrupp AG · DE

Inventors

• Janko Banik · Altena, DE
• Ulrich Etzold · Kerken, DE
• Norbert Rössler · Düsseldorf, DE
• Manuela Ruthenberg · Dortmund, DE
• Thiemo Wuttke · Recklinghausen, DE

Key dates

• Filing date: Aug 26, 2015
• Grant date: Jun 2, 2020
• Expiry date: Nov 12, 2035

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/265
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

A flat steel product for hot forming may be produced from a steel substrate that includes a steel comprising 0.1-3% by weight Mn and up to 0.01% by weight B, along with a protective coating that is applied to the steel substrate. The protective coating may be based on Al and may contain up to 20% by weight of other alloy elements. Also disclosed are methods for producing such flat steel products, steel components, and methods for producing steel components. Absorption of hydrogen is minimized during heating necessary for hot forming. This is achieved at least in part through an alloy constituent of 0.1-0.5% by weight of at least one alkaline earth or transition metal in the protective coating, wherein an oxide of the alkaline earth or transition metal is formed on an outer surface of the protective coating during hot forming of the flat steel product.