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In this paper, the production technology process and relative process parameters of new product, 27SiMn spring steel plate are introduced. The microstructure needed by product is obtained through reasonably setting cooling parameters after rolling, with which the mechanical properties of product are ensured. The using status of users shows that the performances of 27SiMn spring steel plate are good by making full use of existing equipment of Baotou Steel, adopting reasonable process parameters under the condition that both of raw materials and liquid iron meet the requirements. Its tensile strength is not less than 800 MPa and elongation is not less than 19%. Moreover, the effects of atmosphere in heating furnace on decarburized layer on the surface of medium carbon steel with silicon are important, decarburized layer on the surface of 27SiMn spring steel plate is just 24% of the requirements in the national standard GB/T 1222—2016 by reducing atmosphere and micro-positive pressure operations in heating furnace.
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文章介绍了弹簧钢板27SiMn新产品生产工艺流程及相关的工艺参数。通过合理的轧后冷却参数设定,得到了产品需要的组织,该组织保证了产品的力学性能。用户使用情况表明,充分利用包钢现有的装备,采用合理的工艺参数,在原料及铁水都满足要求的情况下,生产出的27SiMn弹簧钢板性能良好,其抗拉强度不小于800 MPa,延伸率不小于19%。此外,加热炉的气氛对含硅中碳钢的表面脱碳层有重要影响,还原性气氛和加热炉内微正压操作使27SiMn弹簧钢板表面脱碳层只有国标GB/T 1222—2016要求的24%。
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李 峰(1971-),男,内蒙古包头市人,博士,高级工程师,现从事弹簧钢等特殊钢产品开发工作。
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李 峰(1971-),男,内蒙古包头市人,博士,高级工程师,现从事弹簧钢等特殊钢产品开发工作。
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李 峰(1971-),男,内蒙古包头市人,博士,高级工程师,现从事弹簧钢等特殊钢产品开发工作。
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| C | Si | Mn | P | S | Cr | Ni | Cu |
| 0.24~0.32 | 1.10~1.40 | 1.10~1.40 | ≤0.030 | ≤0.030 | ≤0.30 | ≤0.30 | ≤0.30 |
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27SiMn钢国标要求的化学成分(质量分数) %
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| C | Si | Mn | P | S | Cr | Ni | Cu |
| 0.24~0.32 | 1.10~1.40 | 1.10~1.40 | ≤0.030 | ≤0.030 | ≤0.30 | ≤0.30 | ≤0.30 |
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| C | Si | Mn | P | S | Cr | Ni | Cu |
| 0.26~0.32 | 1.20~1.40 | 1.20~1.40 | ≤0.020 | ≤0.012 | ≤0.10 | ≤0.10 | ≤0.10 |
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新开发的27SiMn钢化学成分(质量分数) %
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| C | Si | Mn | P | S | Cr | Ni | Cu |
| 0.26~0.32 | 1.20~1.40 | 1.20~1.40 | ≤0.020 | ≤0.012 | ≤0.10 | ≤0.10 | ≤0.10 |
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| Si | P | S |
| 0.3~0.6 | ≤0.160 | ≤0.050 |
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铁水化学成分(质量分数) %
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| Si | P | S |
| 0.3~0.6 | ≤0.160 | ≤0.050 |
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第一炉过热度 /℃ | 其他炉过热度 /℃ | 拉速范围 /(m·min-1) |
| 25~50 | 15~30 | 0.9~1.2 |
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连铸工艺参数
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第一炉过热度 /℃ | 其他炉过热度 /℃ | 拉速范围 /(m·min-1) |
| 25~50 | 15~30 | 0.9~1.2 |
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加热温度 /℃ | 在炉时间 /min | 均热温度 /℃ | 出炉温度 /℃ |
| 1 220~1 290 | 160~240 | 1 230~1 290 | 1 220~1 280 |
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板坯加热及出炉温度
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加热温度 /℃ | 在炉时间 /min | 均热温度 /℃ | 出炉温度 /℃ |
| 1 220~1 290 | 160~240 | 1 230~1 290 | 1 220~1 280 |
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公称直径 或厚度/mm | 总脱碳层深度不大于 直径或厚度的百分比/% |
| ≤8 | 2.8 |
| 8~30 | 2.3 |
| >30 | 1.8 |
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脱碳层要求
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公称直径 或厚度/mm | 总脱碳层深度不大于 直径或厚度的百分比/% |
| ≤8 | 2.8 |
| 8~30 | 2.3 |
| >30 | 1.8 |
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| 项目 | 屈服强度 /MPa | 抗拉强度 /MPa | 延伸率 /% | 布氏硬度 (HRB) |
| 最小值 | 545 | 830 | 19.5 | 234 |
| 最大值 | 585 | 865 | 21.0 | 243 |
| 平均值 | 557 | 843 | 20.2 | 239 |
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27SiMn钢板热轧态的力学性能
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| 项目 | 屈服强度 /MPa | 抗拉强度 /MPa | 延伸率 /% | 布氏硬度 (HRB) |
| 最小值 | 545 | 830 | 19.5 | 234 |
| 最大值 | 585 | 865 | 21.0 | 243 |
| 平均值 | 557 | 843 | 20.2 | 239 |
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