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High Performance Steel Tube for Automotive Parts

机译：汽车零件用高性能钢管

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摘要

JFE Steel has newly developed two kinds of steel tubes having excellent fatigue endurance for automotive suspension parts. The tube employed to torsion beam has an excellent combination of fatigue endurance, hydro-formability and delayed fracture resistance. These properties can be obtained by the low C (less than 0.3%) based chemistry and the high precision controlled rolling and cooling technique in hot rolling. Further developed steel tube for stabilizer exhibits also excellent fatigue endurance induced from its high r-value (more than 1.5) property. This excellent crystallographic characteristics can be obtained by the warm reducing in the "HISTORY" process and contribute to improve the fatigue life by suppressing the wall thickness reduction during bending applications. Moreover, JFE Steel has been promoting the application of steel tube to automotive suspension parts, with not only newly developed steel tubes mentioned above, but also with the analysis of the formability of high strength tube in rotary draw bending process and the development of the related new rotary bending method without both mandrel and wiper.
机译：JFE钢铁公司新开发了两种具有出色的汽车悬架零件疲劳强度的钢管。用于扭力梁的管子具有疲劳强度，液压成形性和耐延迟断裂性的出色组合。这些特性可通过低碳（小于0.3％）的化学成分以及热轧中的高精度控制轧制和冷却技术获得。进一步开发的用于稳定剂的钢管还因其高r值（大于1.5）特性而具有出色的耐疲劳性。通过“ HISTORY”过程中的热还原可以获得这种优异的晶体学特性，并且通过抑制弯曲施加期间壁厚的减小来有助于改善疲劳寿命。此外，JFE Steel不仅通过上述新开发的钢管，还通过分析高强度钢管在旋转拉伸弯曲过程中的可成形性以及相关技术的发展，来促进钢管在汽车悬架零件中的应用。无需心轴和刮水器的新型旋转弯曲方法。

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