Abstract: The ductility of 260 mm x 300 mm casting bloom of V microalloying non-quenched and tempered steel 36Mn2V (% ： 0. 36C, 1. 54Mn, 0. 12V, 0. 008 ~0. 010N) for casing pipe at 650 ~ 1 350 °C has been studied by using Gleeble-1500 thermal simulator. Results show that the zero strength temperature (ZST) and zero ductility temperature (ZDT) of steel 36Mn2V are respectively 1 440 °C and 1 400 °C. ； there are two zones for steel 36Mn2V at melting point Ts ~650 °C , i. e. brittle zone I ,T_s〜1 350 T and the brittle zone Ⅲ, 925 〜625 °C, therefore the straightening temperature for bloom during casting should be more than 925 °C ; the cooling rate (3 ~8 °C/s) from 1 350 °C to test temperature 650 ~ 1 050 °C has no-influence on hot ductility of the steel.

Key words: Non-Quenched and Tempered Steel 36Mn2V, Oil Casing, Continuous Casting Bloom, High Temperature Ductility

摘要： 采用Gleeble-1500热模拟试验机,研究了石油套管用V微合金化非调质钢36Mn2V(%:0.36C、1.54Mn、0.12V、0.008～0.010N)260 mm×300 mm连铸方坯的650～1350℃的延塑性。结果表明,36Mn2V钢的零强度温度(ZST)为1440℃,零塑性温度(ZDT)为1400℃;36Mn2V钢在熔点(Ts)到650℃温度区间内存在两个脆性温度区,第Ⅰ脆性温度区为熔点～1350℃,第Ⅲ脆性温度区为925～650℃,因此,该钢的矫直温度应控制在925℃以上;由1350℃至试验温度(650～1050℃)的冷却速度(3～8℃/s)对36Mn2V钢高温延塑性没有影响。

关键词: 非调质钢36Mn2V, 石油套管, 连铸坯, 高温延塑性