油缸用高強(qiáng)韌性冷拔新材料XG720的開(kāi)發(fā)

Development of Hi-strength/toughness Cold-drawn XG720 Steel for Hydraulic Cylinder Service

摘要: 分析了27SiMn液壓油缸發(fā)生爆缸后材料斷口的形貌與斷裂產(chǎn)生過(guò)程，并提出了一種高強(qiáng)韌性低碳當(dāng)量XG720材料；分析了XG720材料的化學(xué)成分、力學(xué)性能、機(jī)加工性能以及焊接性能。分析認(rèn)為：XG720材料的最大特點(diǎn)是熱軋正火狀態(tài)具有較高的強(qiáng)度與較好的韌性；冷拔加工后，XG720材料的性能完全優(yōu)于27SiMn冷拔狀態(tài)的性能，可以滿足精密鋼管的特殊要求。

Abstract: Analyzed are the fracture morphology and rupturing g enerating process of the 27SiMn material asresulting from blow-out of the hydraulic cylinder. Based on the analysis result，the hi-strength/toughness，low carbonequivalent XG720 steel is proposed. Also analyzed are the chemical composition， mechanical properties，machinability and weldability of the XG720 steel. As a result，it is identified that the XG720 steel mostly featuresrather high strength and good toughness after being hot-rolled and normalized， while after being cold-drawn， itsproperties are quite better than the as-cold-drawn 27SiMn steel，having met the special requirement for the precisionsteel pipe.