| 弧形连铸机生产S355NL/Q355NE钢Φ1200 mm连铸圆坯的工艺实践 |
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| 引用本文： | 周开明,董娟.弧形连铸机生产S355NL/Q355NE钢Φ1200 mm连铸圆坯的工艺实践[J].特殊钢,2023,44(1):10-14. |
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| 作者姓名： | 周开明 董娟 |
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| 作者单位： | 江阴兴澄特种钢铁有限公司研究院棒材研究所 |
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| 摘 要： | Φ1200 mm S355NL/Q355NE钢(Ceq 0.38～0.41)连铸圆坯的生产流程为100 t KR-BOF-LF-RH-R18 m连铸。采用全保护浇注、精确冷却工艺、三段式电磁搅拌、缓冷工艺等技术措施，过热度控制在15～45℃,拉速为0.14～0.20 m/min,电磁搅拌300 A/2 Hz,二冷比水量0.20 L/kg,圆坯入坑缓冷时间≥72 h,出坑温度≤300℃。检测结果表明，O]≤0.0018%、H]≤0.00008%;铸坯中心疏松≤1.5级、中心裂纹≤1.5级、缩孔≤0.5级；全截面碳含量极差≤0.07%;圆坯成分、低倍、表面均满足标准要求。圆坯经用户锻造成壁厚450～550 mm的风电法兰后，夹杂物、力学性能、内部探伤等质量指标检测结果，完全符合技术规范及用户使用要求。
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| 关 键 词： | Φ1200 mm 大截面连铸圆坯 弧形连铸机 |
| 收稿时间： | 2022-07-16 |
Process Practice of Arc Caster Producing φ1200 mm S355NL/Q355NE Steel Continuous Casting Round Bloom |
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| Zhou Kaiming,Dong Juan.Process Practice of Arc Caster Producing φ1200 mm S355NL/Q355NE Steel Continuous Casting Round Bloom[J].Special Steel,2023,44(1):10-14. |
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| Authors: | Zhou Kaiming Dong Juan |
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| Affiliation: | Jiangyin Xingcheng Special Steel Works Co.，Ltd.，Jiangyin 214429 |
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| Abstract: | Φ1200 mmS355NL/Q355NE steel (Ceq0.38-0.41) continuous casting round bloom is manufactured by 100 t KR-BOF-LF-RH-R18M continuous casting process. Full protective casting, precise cooling process, three-stage electro- magnetic stirring, slow cooling process and other technical measures are adopted. The superheat is controlled at 1545 ℃, the drawing speed is 0.14-0.20 m/min, the electromagnetic stirring is 300 A/2 Hz, the secondary cooling water ratio is 0.20 L/kg, the slow cooling time into the pit is ≥72 h, and the pit exit temperature is ≤300 ℃. The results show that 0]≤0.0018%,H]≤0.00008%; the central porosity of cast bloom≤1.5 rating, the central crack≤1.5 rating, the shrinkage cavity ≤0.5 rating, and the carbon content range of the whole section≤0.07%. Chemical composition, macrostruce, surface quality all meets the standard requirements. After the round bloom is forged into wind turbine flanges with wall thickness of 450-550 mm by customer, the test results of inclusions, mechanical properties, internal flaw detection and other quality indexes are satisfactory, which fully meet the technical specifications and user requirements. |
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| Keywords: | Φ1 200 mm Large Section Round Bloom Arc Continuous Caster |
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