一种发动机曲轴用钢棒材及其生产方法

By employing an eco-friendly electric furnace + LF + RH + continuous casting smelting process and multi-element micro-alloying treatment, the strength and fatigue problems of high-end crankshaft steel have been solved, enabling the production of high-performance, low-cost engine crankshaft steel bars that meet the stringent requirements of modern engines.

CN121874659BActive Publication Date: 2026-07-17BENGANG STEEL PLATES CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
BENGANG STEEL PLATES CO LTD
Filing Date
2026-03-23
Publication Date
2026-07-17

AI Technical Summary

Technical Problem

Existing crankshaft steels are insufficient to meet the design requirements of modern engines with high power density, long lifespan, and stringent emission standards in terms of strength and fatigue limit. Inadequate purity control leads to non-metallic inclusions becoming sources of fatigue cracks. Traditional processes are costly and energy-intensive, making it difficult to combine eco-friendly electric furnaces with high-end crankshaft steels.

Method used

The process employs an eco-friendly electric furnace + LF + RH + continuous casting smelting technology, using 100% scrap steel as raw material. Through multi-element microalloying (Ti, V, Nb, etc.) and precise heat treatment, the element content and inclusions in the steel are controlled. Combined with precise rolling technology, this ensures the high strength and purity of the steel.

Benefits of technology

We have achieved high-strength, low-cost steel bars for engine crankshafts, with tensile strength ≥1580MPa, impact toughness ≥47J, inclusions ≤1.5 grade, excellent surface quality, significantly improved fatigue life, and high uniformity of finished product structure and high flaw detection pass rate.

✦ Generated by Eureka AI based on patent content.

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Abstract

本发明属于棒材生产技术领域，尤其涉及一种发动机曲轴用钢棒材及其生产方法，其化学成分按质量百分比计包括：C：0.25%～0.30%，Si：0.20%～0.30%，Mn：1.00%～1.10%，P≤0.015%，S≤0.008%，Cr：1.20%～1.30%，Ni≤0.25%，Ti：0.05%～0.09%，Mo：0.15%～0.20%，V：0.06%～0.10%，Cu≤0.10%，其余为Fe及不可避免的杂质。优点是：本发明采用生态电炉+LF+RH+连铸冶炼工艺和轧制工艺生产发动机曲轴用钢棒材，解决了高端发动机曲轴用钢棒材在强韧性、疲劳寿命及表面质量方面的严苛需求。
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