steel material

By controlling the steel composition and the formation of fine precipitates, the problem of insufficient strength in non-heat-treated steel is solved, achieving high strength and simplified manufacturing process, making it suitable for automotive engine parts.

CN116240453BActive Publication Date: 2026-06-12DAIDO STEEL CO LTD
8 Cites 0 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
DAIDO STEEL CO LTD
Filing Date
2022-12-08
Publication Date
2026-06-12

AI Technical Summary

⚠Technical Problem

Existing non-heat-treated steels have limitations in improving strength, especially due to the limited solid solution content of V and Ti, making it difficult to obtain high strength without heat treatment, and heat treatment increases the complexity of the manufacturing process.

⚗Method used

By controlling the composition of steel, including the content of C, Si, Mn, Cr, and V, and limiting the upper limits of Ti, P, and S, and by using specific P0, P1, P2, and P3 formulas, the formation of fine precipitates is ensured, bainite formation is avoided, and high strength is achieved.

🎯Benefits of technology

Without heat treatment, the steel has a yield point of over 900 MPa and a yield ratio of over 0.80, which simplifies the manufacturing process and improves machinability and strength.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
Patent Text Reader

Abstract

The present invention relates to a steel material comprising, in mass%, 0.30%≤C≤0.45%, 0.10%≤Si≤1.00%, 0.60%≤Mn≤1.20%, 0.20%≤Cr≤0.70%, 0.30%≤V≤0.47%, Ti≤0.015%, P≤0.100%, and S≤0.080%, the balance being Fe and unavoidable impurities, and having a P0 value defined by P0=P0'×V / P1, satisfying P0≥0.30, where P0'=Mn+0.49Cu+0.89Ni+0.40Cr-0.30Si, and P1=C+0.07Si+0.16Mn+0.61P+0.19Cu+0.17Ni+0.2Cr+V, in the formula, each element symbol represents the content of each element in mass%.
Need to check novelty before this filing date? Find Prior Art