Patent · US Active

NPR steel material for rock bolt and production method thereof

US11427899B2 · kind B2 · utility

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0References

4Claims

0Family size

Assignee

XIA, MIN · CN

Inventors

Manchao He · Beijing, CN
Min Xia · Gatineau, CA
Hongyan Guo · Beijing, CN
Jiuping Wang · Dongtai City, CN

Key dates

Filing date	May 23, 2018
Grant date	Aug 30, 2022
Priority date	—
Expiry date	May 23, 2038

Classification

Technology area (CPC E)Fixed Constructions
CPC primaryE21D21/0006
WIPO fieldMaterials, metallurgy
WIPO sectorChemistry

Abstract

An NPR steel material for rock bolt and a production method thereof are disclosed. The NPR steel material for rock bolt has a composition, in weight percent, consisting of: C: 0.4-0.7%, Mn: 15-20%, Si: ≤0.1%, Cu: ≤0.03%, Cr: ≤0.01%, Ni: ≤0.02%, S: ≤0.001%, P: ≤0.001%, and the rest being Fe and unavoidable impurity elements. The NPR steel material for rock bolt and the production method thereof effectively solve the problem that rock bolts in the prior art have low tensile strength and low effective elongation. The NPR steel material for rock bolt has a yield strength adjustable in the range of 500-1100 MPa, and an elongation adjustable in the range of 10-80%.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.