A high-strength bolt and its manufacturing method

By using multi-element alloying design and special processing techniques, the microstructure and surface properties of bolts are optimized, solving the problem of performance degradation of existing high-strength bolts in extreme environments and achieving improved high-temperature stability and corrosion resistance.

CN120210668BActive Publication Date: 2026-06-30HANDAN SADE FASTENER MFG CO LTD
View PDF 2 Cites 0 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
HANDAN SADE FASTENER MFG CO LTD
Filing Date
2025-04-10
Publication Date
2026-06-30

AI Technical Summary

Technical Problem

Existing high-strength bolts suffer from performance degradation or failure under extreme environments, making it difficult to meet the requirements for high strength, long fatigue life, and corrosion resistance.

Method used

A multi-element alloying design is adopted to control the proportions of elements such as C, Si, Mn, Cr, W, Co, Mo, Nb, Ti, Al, N, V, Ce, Y, Re, and B. The microstructure and surface properties of the bolts are optimized through a two-stage solution treatment, cryogenic treatment, and surface deposition of NiZr alloy layers and diamond-like carbon films.

Benefits of technology

It significantly improves the high-temperature stability and corrosion resistance of bolts, enhances the overall performance of bolts, especially their service life and reliability in extreme environments.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure SMS_1
    Figure SMS_1
Patent Text Reader

Abstract

This invention relates to the field of alloy steel and proposes a high-strength bolt and its manufacturing method. The bolt is composed of the following components by mass percentage: C 0.28%~0.35%, Si 0.3%~0.35%, Mn 0.5%~0.6%, Cr 1.2%~1.5%, W 0.18%~0.22%, Co 0.1%~0.3%, Mo 0.2%~0.3%, Nb 0.03%~0.05%, Ti 0.02%~0.05%, Al 0.015%~0.03%, N 0.008%~0.015%, V 0.18%~0.22%, Ce 0.05%~0.12%, Y 0.03%~0.08%, Re 0.03%~0.06%, B 0.002%~0.005%, with the balance being Fe and other unavoidable impurities. This invention improves the strength of bolts and further enhances their high-temperature stability and corrosion resistance.
Need to check novelty before this filing date? Find Prior Art