液化气体汽车罐车用钢XGQ420DR的研制
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摘要
通过化学成分的合理设计,以及对炼钢、连铸、轧制及正火热处理工艺关键要点的摸索,采用先进的中厚板生产设备成功研制出6～30 mm厚度的液化气体汽车罐车用钢XGQ420DR。试验钢各项力学性能满足标准及相关技术要求:屈服强度富余量20～70 MPa、抗拉强度富余量30～40 MPa、延伸率≥20%、屈强比≤0.80;弯心直径为3a、冷弯至180°合格;-40℃平均夏比V型冲击功≥150 J、韧脆性转变温度≤-55℃;无塑性转变温度NDTT≤-50℃。XGQ420DR钢板主要以准多边形铁素体+弥散分布的珠光体组织为主,且组织均匀,晶粒度细小。
Through rational design of chemical composition and exploration of key points of steelmaking, continuous casting, rolling and normalizing heat treatment process, the liquefied gas automobile tanker steel XGQ420 DR with thickness of 6～30 mm was successfully developed by using advanced heavy plate production equipments. The mechanical properties of the tested steel meet the standards and related technical requirements: yield strength margin 20 ～70 MPa, tensile strength margin 30～40 MPa, elongation≥20% and Y/T ratio≤0.80; bending diameter 3 a, cold bending to180°;-40℃ average Charpy V impact ≥150 J, ductility-brittleness transition temperature ≤-55℃ and non-plastic transition temperature NDTT ≤-50℃. XGQ420 DR steel plate is mainly composed of quasi-polygonal ferrite+dispersed pearlite, with uniform structure and fine grain size.
Through rational design of chemical composition and exploration of key points of steelmaking, continuous casting, rolling and normalizing heat treatment process, the liquefied gas automobile tanker steel XGQ420 DR with thickness of 6～30 mm was successfully developed by using advanced heavy plate production equipments. The mechanical properties of the tested steel meet the standards and related technical requirements: yield strength margin 20 ～70 MPa, tensile strength margin 30～40 MPa, elongation≥20% and Y/T ratio≤0.80; bending diameter 3 a, cold bending to180°;-40℃ average Charpy V impact ≥150 J, ductility-brittleness transition temperature ≤-55℃ and non-plastic transition temperature NDTT ≤-50℃. XGQ420 DR steel plate is mainly composed of quasi-polygonal ferrite+dispersed pearlite, with uniform structure and fine grain size.
引文
[1]刘云旭.金属热处理原理[D].北京:机械工业出版社,1981.
[2]Z J,C Q W,W H B,et.al.Effect of tempering temperature on microstructure and properties of E690off shore plate steel[J].Journal of Iron and Steel Research,2012,19(3):67-72.
[3]刘立彪,张计谋,谭小斌,等.焊后热处理温度对Q420R性能与组织的影响[J].世界有色金属,2017(23):234-235.
[4]刘立彪,张计谋,罗登,等.核电安全壳用钢SA738Gr.B的研发[J].金属材料与冶金工程,2018,46(2):13-17.
[5]刘年富,廖卫团,温志红,等.正火对EH36级船板钢低温时效冲击性能的影响[J].宝钢技术,2012(6):27-31.
[2]Z J,C Q W,W H B,et.al.Effect of tempering temperature on microstructure and properties of E690off shore plate steel[J].Journal of Iron and Steel Research,2012,19(3):67-72.
[3]刘立彪,张计谋,谭小斌,等.焊后热处理温度对Q420R性能与组织的影响[J].世界有色金属,2017(23):234-235.
[4]刘立彪,张计谋,罗登,等.核电安全壳用钢SA738Gr.B的研发[J].金属材料与冶金工程,2018,46(2):13-17.
[5]刘年富,廖卫团,温志红,等.正火对EH36级船板钢低温时效冲击性能的影响[J].宝钢技术,2012(6):27-31.