Packaging sheet metal product

US11613798B2 · kind B2 · utility

Assignee

• thyssenkrupp Rasselstein GmbH · DE

Inventors

• Burkhard Kaup · Andernach, DE
• Luisa-Marie Heine · Koblenz, DE
• Blaise Massicot · Burgbrohl, DE

Key dates

• Filing date: Mar 5, 2021
• Grant date: Mar 28, 2023
• Expiry date: May 11, 2041

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C25D3/22
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

A packaging sheet metal product from a cold-rolled steel sheet with a thickness of less than 0.6 mm has a specified composition. The packaging sheet metal product during biaxial deformation in a bulge test has a lower yield strength (SbeL) of more than 300 MPa and a corresponding elongation at break (Ab) of more than 10% and in the plastic region between the Lüders elongation (Abe) and an upper (plastic) elongation limit of εmax=0.5·Ab·(SbeL/Sbm) has a biaxial stress/strain diagram σB(ε) that can be represented by a function εB=b·εn, with: σB is the true biaxial stress in MPa; ε is the amount of true elongation in the thickness direction in %; Sbm is the absolute strength; b is a proportionality factor; and n is a strain-hardening exponent. A strengthening of the packaging sheet product in the thickness direction is characterized by a strain-hardening exponent of n≥0.353-5.1·SbeL/104 MPa.