The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 21, 2020
Filed:
Nov. 06, 2015
Salzgitter Flachstahl Gmbh, Salzgitter, DE;
SALZGITTER FLACHSTAHL GMBH, Salzgitter, DE;
Abstract
An ultra-high-strength air-hardenable multiphase steel having minimal tensile strengths in a non air hardened state of 950 MPa and excellent processing properties, includes the following elements in % by weight: C≥0.075 to ≤0.115; Si≥0.400 to ≤0.500; Mn≥1,900 to ≤2,350; Cr≥0.200 to ≤0.500; Al≥0.005 to ≤0.060; N≥0.0020 to ≤0.0120; S≤0.0030; Nb≥0.005 to ≤0.060; Ti≥0.005 to ≤0.060; B≥0.0005 to ≤0.0030; Mo≥0.200 to ≤0.300; Ca≥0.0005 to ≤0.0060; Cu≤0.050; Ni≤0.050; remainder iron, including usual steel accompanying smelting related impurities, wherein for a widest possible process window during continuous annealing of hot rolled or cold rolled strips made from said steel a sum content of M+Si+Cr in said steel is a function of a thickness of the steel strips according to the following relationship: for strip thicknesses of up to 1.00 mm the sum content of M+Si+Cr is ≥2.800 and ≤3.000%, for strip thicknesses of over 1.00 to 2.00 mm the sum of Mn+Si+Cr is ≥2.850 and ≤3.100%, and for strip thicknesses of over 2.00 mm the sum of Mn+Si+Cr is ≥2.900 and ≤3.200%.