摘要:
C70S6钢是制造胀断连杆的重要材料, 胀断技术要求材料具有高强度、低韧性、胀断脆性断裂断面塑性变形小以及切削性能优良的特点。对国外钢厂与国内三厂的连杆钢C70S6进行检测对比分析。结果显示:国内钢样中锰、硫含量明显高于国外钢厂, Ni、V、Ti含量偏低;国内外钢样中显微组织都是由片层状珠光体和少量铁素体组成, 但国外钢样晶粒较小, 铁素体含量较低;国外钢样中硫化物呈弥散化分布, 形态趋于纺锤形, 复合型夹杂物比例较高, 而国内钢样中硫化物分布不均匀, 形态趋于长条形, 复合型夹杂物比例较低。
Abstract:
Cracking technology requires materials with advanced performances of high strength,low toughness,well-cutting and small plastic deformation during brittle fracture.The C70 S6 steel is an important material for fracture splitting connection rod.The steels produced by Chinese and overseas steelmakers had been compared in terms of their comprehensive performance.The samples of Chinese steel have higher sulfur and manganese content,while nickel,vanadium,titanium content are lower. All samples have same microscopic structures comprising lamellar pearlite and small amount of ferrite.However,overseas samples have smaller grain size and lower ferrite amount.Besides,for overseas samples,the sulfide is in form of spindle and distributes evenly in matrix,and amount of complex inclusions is higher. For Chinese samples,the sulfide in long-strip state distributes uniformly and the amount of complex inclusions is smaller.
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