一种油缸用管材及其制造方法

By using a reasonable composition design and online controlled cooling and tempering heat treatment process, the problems of high yield strength ratio, large residual stress and poor weldability of cylinder tubes have been solved, and the manufacturing of cylinder tubes with high strength, low yield strength ratio and low residual stress has been achieved.

CN117363970BActive Publication Date: 2026-07-17BAOSHAN IRON & STEEL CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
BAOSHAN IRON & STEEL CO LTD
Filing Date
2022-06-30
Publication Date
2026-07-17

AI Technical Summary

Technical Problem

While existing hydraulic cylinder tubing improves strength, it suffers from problems such as high yield strength ratio, large residual stress, and poor weldability, making it difficult to meet the lightweight requirements of engineering machinery.

Method used

By employing a reasonable composition design and online controlled cooling and tempering heat treatment process, and through a combination of external wall water spray cooling and internal wall supplementary cooling, the cooling rate and temperature are controlled, the grains are refined, residual stress is reduced, and welding performance is improved.

Benefits of technology

The pipes for hydraulic cylinders have yield strengths of 900-1030 MPa, yield strength ratios of ≤0.93, and residual stresses ranging from -100 MPa to 50 MPa, and possess good weldability and toughness.

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Abstract

本发明提供一种具有高强度、低屈强比、低残余应力的油缸用管材，其特征在于，以质量百分比计，其组成为：C：0.25‑0.33％，Si：0.15‑0.55％，Mn：0.5‑1.1％，Cr：0.1‑0.5％，Mo：0.1‑0.35％，V：0.05‑0.15％，Ti：0.015‑0.05％，B：0.0015‑0.005％，Al：0.01‑0.05％，Ca：0.0005‑0.005％；余量为Fe和不可避免的杂质，所述油缸用管材的碳当量为0.45‑0.65，屈强比在0.93以下。本发明还提供该油缸用管材的制造方法。
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