论文部分内容阅读
系统研究了用于生产N80级热轧非调质无缝油井管的钢种33Mn2V在不同加热温度和不同保温时间下的奥氏体晶粒长大规律,结果表明,该钢在1100和1200℃保温时,奥氏体晶粒等温长大规律较好地服从抛物线型经验表达式,等温长大指数n均相当接近1/2,若等温时间为10 min,利用ASTM晶粒度级别等于5.00的临界判据定义的该钢实用奥氏体晶粒粗化温度位于1250℃左右;在900—1250℃温度范围内,该钢种奥氏体平均晶粒尺寸(D)与加热温度(T)的定量关系近似服从Arrhenius关系:D=1.12×10~4exp(-8.31×10~3/T),表明该钢在高温加热时具有较好的抗晶粒粗化能力,此结论对于将该钢种实际应用于N80级的热轧非调质无缝油井管工业化生产具有重要参考价值。
The law of austenite grain growth of 33Mn2V steel used in the production of grade N80 hot-rolled non-quenched and tempered seamless oil well pipe at different heating temperatures and different holding time was systematically studied. The results show that at 1100 and 1200 ℃ When keeping warm, the law of isothermal growth of austenite obeys the parabolic empirical expression well. The isothermal growth index n is very close to 1/2. If the isothermal time is 10 min, the grain size of ASTM is equal to 5.00 The critical austenite grain coarsening temperature of the steel, as defined by the critical criterion, lies at about 1250 ° C. The average austenite grain size (D) and the heating temperature (T) of the steel in the temperature range of 900-1250 ° C The quantitative relationship approximately follows the Arrhenius relationship: D = 1.12 × 10 ~ 4exp (-8.31 × 10 ~ 3 / T), indicating that the steel has better resistance to grain coarsening when heated at high temperature. The practical application of N80 hot-rolled non-quenched and tempered seamless oil well pipe industrial production has an important reference value.