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The SS steel grade rail with 60E1 cross section is manufactured with small batch production by comparing the rails with 60E1 and 115RE cross sections, optimizing chemical composition, adopting narrow composition control, increasing C content, controlling contents of Mn and Cr as well as optimizing rolling process. The rail performances could reach Rp0.2≥512 MPa,Rm≥982 MPa,A≥10% and tread hardness (HB) ≥310. The small batch industrial production practices prove that the production process of SS steel grade rail with 60E1 cross section is trouble free and its performances are stable, which could meet the user needs so that it can be produced with incremental quantity.
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通过60E1和115RE断面钢轨对比,优化钢轨化学成分,采取窄成分控制,提高C含量,控制Mn、Cr元素含量,优化轧制工艺,小批量生产了60E1断面SS钢轨,钢轨性能达到Rp0.2≥512 MPa,Rm≥982 MPa,A≥10%,踏面硬度(HB)≥310。小批量工业生产实践证明,60E1断面SS钢轨生产工艺顺行,性能稳定,满足用户需要,可以扩量生产。
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赵桂英(1974-),女,内蒙古凉城县人,硕士,高级工程师,现从事钢轨新产品研发工作。
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赵桂英(1974-),女,内蒙古凉城县人,硕士,高级工程师,现从事钢轨新产品研发工作。
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| 项目 | C | Si | Mn | P | S | Cr |
| 优化后 | 0.78~0.85 | 0.50~0.60 | 1.15~1.25 | ≤0.020 | ≤0.020 | 0.20~0.30 |
| 优化前 | 0.77~0.82 | 0.50~0.60 | 1.10~1.25 | ≤0.020 | ≤0.020 | 0.20~0.30 |
| 标准 | 0.74~0.86 | 0.10~0.60 | 0.75~1.25 | ≤0.020 | ≤0.020 | ≤0.30 |
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SS钢轨化学成分范围(质量分数) %
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| 项目 | C | Si | Mn | P | S | Cr |
| 优化后 | 0.78~0.85 | 0.50~0.60 | 1.15~1.25 | ≤0.020 | ≤0.020 | 0.20~0.30 |
| 优化前 | 0.77~0.82 | 0.50~0.60 | 1.10~1.25 | ≤0.020 | ≤0.020 | 0.20~0.30 |
| 标准 | 0.74~0.86 | 0.10~0.60 | 0.75~1.25 | ≤0.020 | ≤0.020 | ≤0.30 |
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| 项目 | 转炉终点(质量分数)/% | | 精炼VD | | 连铸 |
| C | P | S | 深真空时间/min | 软吹时间/min | 拉速/(m·min-1) | 过热度/℃ |
| 最大值 | 0.368 | 0.020 | 0.041 | | 21 | 22 | | 0.62 | 30 |
| 最小值 | 0.096 | 0.015 | 0.017 | | 15 | 16 | | 0.62 | 23 |
| 平均值 | 0.211 | 0.017 | 0.031 | | 16 | 18 | | 0.62 | 28 |
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主要工艺参数
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| 项目 | 转炉终点(质量分数)/% | | 精炼VD | | 连铸 |
| C | P | S | 深真空时间/min | 软吹时间/min | 拉速/(m·min-1) | 过热度/℃ |
| 最大值 | 0.368 | 0.020 | 0.041 | | 21 | 22 | | 0.62 | 30 |
| 最小值 | 0.096 | 0.015 | 0.017 | | 15 | 16 | | 0.62 | 23 |
| 平均值 | 0.211 | 0.017 | 0.031 | | 16 | 18 | | 0.62 | 28 |
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| 项目 | H | O | N |
| 最小值 | 0.000 099 | 0.000 3 | 0.004 3 |
| 最大值 | 0.000 200 | 0.001 0 | 0.005 8 |
| 平均值 | 0.000 149 | 0.000 7 | 0.004 7 |
| 技术要求 | ≤0.000 25 | ≤0.000 2 | ≤0.008 0 |
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钢中气体含量(质量分数) %
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| 项目 | H | O | N |
| 最小值 | 0.000 099 | 0.000 3 | 0.004 3 |
| 最大值 | 0.000 200 | 0.001 0 | 0.005 8 |
| 平均值 | 0.000 149 | 0.000 7 | 0.004 7 |
| 技术要求 | ≤0.000 25 | ≤0.000 2 | ≤0.008 0 |
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| 编号 | 中心疏松 | 缩孔 | 中心裂纹 | 中间裂纹 | 皮下裂纹 | 角部裂纹 | 皮下气泡 | 非金属夹杂物 |
| 1# | 0.5 | 0 | 0 | 0 | 0 | 0 | 0 | 0.5 |
| 2# | 0.5 | 0 | 0 | 0 | 0 | 0 | 0 | 0.5 |
| 3# | 0.5 | 0 | 0 | 0 | 0 | 0 | 0 | 0.5 |
| 4# | 0.5 | 0 | 0 | 0 | 0 | 0 | 0 | 0.5 |
| 5# | 0.5 | 0 | 0 | 0 | 0 | 0 | 0 | 0.5 |
| 6# | 0.5 | 0 | 0 | 0 | 0 | 0 | 0 | 0.5 |
| 技术要求 | ≤2 |
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铸坯低倍结果 级
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| 编号 | 中心疏松 | 缩孔 | 中心裂纹 | 中间裂纹 | 皮下裂纹 | 角部裂纹 | 皮下气泡 | 非金属夹杂物 |
| 1# | 0.5 | 0 | 0 | 0 | 0 | 0 | 0 | 0.5 |
| 2# | 0.5 | 0 | 0 | 0 | 0 | 0 | 0 | 0.5 |
| 3# | 0.5 | 0 | 0 | 0 | 0 | 0 | 0 | 0.5 |
| 4# | 0.5 | 0 | 0 | 0 | 0 | 0 | 0 | 0.5 |
| 5# | 0.5 | 0 | 0 | 0 | 0 | 0 | 0 | 0.5 |
| 6# | 0.5 | 0 | 0 | 0 | 0 | 0 | 0 | 0.5 |
| 技术要求 | ≤2 |
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| 断面 | 项目 | Rm/MPa | Rp0.2/MPa | A/% | 硬度(HB) | |
| 115RE | 最大值 | 1 110 | 680 | 13.5 | 320 | |
| 最小值 | 1 070 | 581 | 10.0 | 312 |
| 平均值 | 1 094 | 623 | 10.5 | 316 |
| 60E1 | 最大值 | 1 125 | 677 | 12.5 | 319 | |
| 最小值 | 1 053 | 596 | 10.0 | 311 |
| 平均值 | 1 095 | 635 | 11.0 | 316 |
| 技术要求 | ≥982 | ≥512 | ≥10 | ≥310 | |
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钢轨拉伸性能与硬度统计
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| 断面 | 项目 | Rm/MPa | Rp0.2/MPa | A/% | 硬度(HB) | |
| 115RE | 最大值 | 1 110 | 680 | 13.5 | 320 | |
| 最小值 | 1 070 | 581 | 10.0 | 312 |
| 平均值 | 1 094 | 623 | 10.5 | 316 |
| 60E1 | 最大值 | 1 125 | 677 | 12.5 | 319 | |
| 最小值 | 1 053 | 596 | 10.0 | 311 |
| 平均值 | 1 095 | 635 | 11.0 | 316 |
| 技术要求 | ≥982 | ≥512 | ≥10 | ≥310 | |
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| 项目 | 非金属夹杂物/级 |
| A | B | C | D |
| 最大值 | 1.5 | 1.0 | 1.0 | 1.0 |
| 最小值 | 1.0 | 0.5 | 1.0 | 1.0 |
| 技术要求 | ≤2.5 | ≤1.5 | ≤1.5 | ≤1.5 |
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非金属夹杂物检验结果
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| 项目 | 非金属夹杂物/级 |
| A | B | C | D |
| 最大值 | 1.5 | 1.0 | 1.0 | 1.0 |
| 最小值 | 1.0 | 0.5 | 1.0 | 1.0 |
| 技术要求 | ≤2.5 | ≤1.5 | ≤1.5 | ≤1.5 |
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