正火温度对汇管用控轧钢组织及力学性能的影响
Influence of Normalizing Temperature on Microstructure and Mechanical Properties of Controlled Rolling Steel for Preparation of Manifolds
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- 引用格式:
-
刘迎来,王高峰,聂向辉,许,彦.正火温度对汇管用控轧钢组织及力学性能的影响[J].天然气与石油,2015,33(5):0.doi:
Liu Yinglai, Wang Gaofeng, Nie Xianghui, Xu Yan.Influence of Normalizing Temperature on Microstructure and Mechanical Properties of Controlled Rolling Steel for Preparation of Manifolds[J].Natural Gas and Oil,2015,33(5):0.doi:
- DOI:
- 作者:
- 刘迎来 王高峰 聂向辉 许 彦
Liu Yinglai, Wang Gaofeng, Nie Xianghui, Xu Yan
- 作者单位:
- 中国石油集团石油管工程技术研究院
CNPC Tubular Goods Research Institute
- 关键词:
- 控轧钢；汇管；金相组织；强度低谷；力学性能
Controlled rolling steel; Microstructure of manifolds; Low valley range of strength
- 摘要:
- 利用箱式加热炉，在实验室条件下模拟油气管道工程站场汇管在火焰加热成型时其支管附近材料受热的过程，以及X60、X70和X80钢级强度下4种组分的厚壁筒节材料在650 ℃回火后的控轧钢组织及力学性能的变化规律。结果表明：X60、X70和X80钢级强度下，4种组分的厚壁筒节材料在300～1 050 ℃不同温度下加热保温再经650 ℃回火后，低于奥氏体加热温度下的组织呈回火贝氏体+少量铁素体组织形貌，在相变点以上加热，原材料组织则转变为粗化的铁素体加少量珠光体组织。加热后材料的屈服强度和硬度检测值随加热温度的递增呈先升再降后又升高的趋势；选取的材料在700～1 000 ℃加热区间均存在一个强度低谷，屈服强度最小值较原材料实测值降低94～212 MPa，远达不到原材料强度水平；材料夏比冲击吸收能量随加热温度升高而降低，尽管-20 ℃检测结果仍能满足工程设计要求，但在高温区吸收能量值的离散性相对原材料明显增大。
Under laboratory conditions, used is a box-type heater to stimulate the effect of heating process on the material near branch pipes of manifolds at oil and gas pipeline stations and analyzed is the change rule of microstructure and mechanical properties of four compositions of materials containing such three kinds of steel grades as X60, X70 and X80 after being tempered at 650 °C and results from stimulation and analysis show that after the materials containing such three kinds of steel grades as X60, X70 and X80 are heated and have heat preservation in different temperature conditions between 300 °C and 1050 °C and then tempered at 650 °C , their microstructures in lower than the Austenite transition temperature present the morphology of tempered bainite and a small amount of ferrite. When the raw materials are heated above the temperature of phase change, their microstructure will be transformed into coarsening ferrite and a small amount of pearlite. After heating, the yield strength and hardness of the materials present a trend of rise, drop and rise again along with the increase of heating temperature. All of the selected materials have a low valley of strength in the 700 °C to 1000 °C heating temperature conditions and the minimum yield strength dropped 94 - 212 MPa than the measured value of the raw material, far lower than that of the raw material. The Charpy impact energy absorption of the materials drops along with the increase of heating temperature. Although the testing results obtained in -20 °C temperature condition still can meet the requirement of engineering design, the dispersion of energy absorption values in high temperature zone is obvicusly increased than that of the raw material.
