Development of X80M hot-rolled steel plate for LSAW pipe
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摘要: 为了满足中俄东线450×108 m3/a超大输量及−40 ℃极寒地区服役的国家重大管道工程建设用钢要求，结合南钢自身设备特点，试验开发了具有高强韧性的Φ1422 mm×32.1 mm直缝埋弧焊管用热轧钢板。通过冶金热力学温度控制及保护浇铸手段，得到了成分波动范围窄、低倍组织评级C0.5级的高洁净度铸坯，试验确定了TMCP轧制工艺，钢板力学性能检测富裕量充裕，少量先共析铁素体+针状铁素体+贝氏体+马奥岛的软/硬相复合组织，满足了X80M钢板高强韧性要求，强韧性指标符合管道技术规范要求，实现了中俄东线低温超大输量管道用钢的批量工业生产。Abstract: In order to meet the requirements for annual transportation of 45 billion cubic meters of the China-Russian Eastern Line and the demand for construction of major national pipelines in extremely cold regions at −40 ℃, NISCO has tested and developed Φ1422 mm×32.1 mm straight seam submerged arc welded pipeline steel plates which have high strength and toughness. The high cleanliness casting slabs with narrow composition fluctuation range and low organization rating C0.5 were obtained by metallurgical thermodynamic temperature control and protective casting methods. The industrial test verified the TMCP rolling process. The microstructure is composed of small amount of eutectoid ferrite+acicular ferrite+bainite+M/A island soft/hard phase, which meets the high strength and toughness requirements of X80M steel plate. The strength and toughness performance indicators meet the requirements of pipeline technical specifications and meet mass industrial production of steel for low-temperature and large-volume pipelines.
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图 1 成品磷、硫、氧、氮、氢控制
Figure 1. Phosphorus, sulfur, oxygen, nitrogen, hydrogen contents in finished steel product
图 4 不同终轧温度下试验钢的拉伸性能变化趋势
Figure 4. Tensile properties of test steel processed under different finish rolling temperatures
图 5 试验钢在不同终轧温度下的显微组织 ×1 000
Figure 5. Microstructure of test steel processed at different finish rolling temperatures ×1 000
图 6 试验钢在不同入水温度下的力学性能
Figure 6. Mechanical properties of test steel at different entry temperatures into water cooling section
图 7 试验钢在不同入水温度下的显微组织
Figure 7. Microstructure of test steel at different entry temperatures into water cooling section
图 8 试验钢在不同返红温度下的强度与DWTT
Figure 8. Test steel strength and DWTT at different end cooling temperatures
图 11 X80M落锤性能分布
Figure 11. Distribution of Drop weight performance of X80M steel plate
表 1 X80MΦ1422 mm×32.1 mm直缝埋弧焊管用热轧钢板拉伸性能试验要求
Table 1. Requirements for X80M Φ1 422 mm×32.1 mm hot-rolled steel plate for LSAW pipe
钢级 屈服强度/MPa 抗拉强度/MPa 最大屈强比(Rt0.5/Rm) 最小伸长率(Af) /% 最小 最大 最小 最大 X80 555 700 625 765 0.93 按API Spec 5L 注：本要求为钢管拉伸性能要求。根据协商一致原则，由制造商负责对供应的钢板拉伸性能进行调整，但应保证制成钢管的拉伸性能符合直缝埋弧焊钢管技术条件的规定。 
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表 2 X80MΦ1422 mm×32.1 mm直缝埋弧焊管用热轧钢板夏比冲击试验要求
Table 2. Charpy impact test requirements for X80M Φ1422 mm×32.1 mm hot-rolled steel plate for LSAW pipe
钢级 试验温度/℃ 位置 夏比冲击剪切面积(SA)/% 夏比冲击功/J 单个试样最小值 三个试样最小平均值 单个试样最小值 三个试样最小平均值 X80 −30 板宽1/4横向 70 85 160 210 注：10 mm×10 mm×55 mm试样。
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表 3 X80MΦ1 422 mm×32.1 mm直缝埋弧焊管用热轧钢板X80M坯料成分设计
Table 3. Alloying design for X80MΦ1 422 mm×32.1 mm hot-rolled steel plate for LSAW X80M billet
% C Si Mn P S Nb+V+Ti Ca 内控 0.040~0.060 0.20~0.30 1.60~1.70 ≤0.012 ≤0.002 0.055~0.080 0.0005~0.0040 A1t Cr Ni Cu B N H Pcm 内控 0.015~0.050 0.10~0.20 0.15~0.30 0.10~0.20 ≤0.0005 ≤0.0060 ≤0.0002 0.17~0.22
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表 4 X80MΦ1 422 mm×32.1 mm直缝埋弧焊管用热轧钢板硬度（HV10）检测结果
Table 4. Hardness (HV10) test results of X80M Φ1 422 mm×32.1 mm hot rolled steel plate for LSAW pipe
试样号 厚度/mm 厚度方向截面硬度（HV10） 近上表单值 心部单值 近下表单值 最大值 试样1 32.1 205 203 216 208 209 207 205 211 206 216 试样2 32.1 234 211 229 216 211 213 212 219 218 234 试样3 32.1 220 215 213 221 212 220 221 219 218 221 试样4 32.1 239 225 229 216 220 214 217 216 211 239
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