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:
Dec. 23, 2025
Filed:
Sep. 16, 2021
Shandong Iron and Steel Company Ltd., Laiwu, CN;
SHANDONG IRON AND STEEL COMPANY LTD., Laiwu, CN;
Abstract
A hot-rolled, low-temperature-resistant, H-shaped steel with a grade of 420 MPa includes the following chemical components in percentages by weight: C: 0.08-0.10%, Si≤0.2%, Mn: 1.25-1.45%, V: 0.03-0.045%, Ti: 0.015-0.025%, Cr: 0.15-0.30%, Al: 0.02-0.04%, N: 0.007-0.01%, P≤0.008%, S≤0.005%, O≤0.004%, and the balance being Fe and inevitable impurities. Its manufacturing adopts the characteristic of the flange of the small-specification H-shaped steel being thin in rectangular blank rolling, uses the design of a low C content suitable for normalizing rolling combined with a V micro-alloyed component, and adds an appropriate amount of Cr to control the cooling rate. The method avoids abnormal structures such as widmanstatten, which would reduce steel's low-temperature impact toughness, and results in a stably controlled, high-strength and high-toughness, hot-rolled, H-shaped steel with a grade of 420 MPa or more obtained on a hot-rolled H-shaped steel rolling mill.