CN114507816A - 一种运煤专线用腐蚀钢轨及其制造方法 - Google Patents
一种运煤专线用腐蚀钢轨及其制造方法 Download PDFInfo
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- 229910052748 manganese Inorganic materials 0.000 claims abstract description 9
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- 230000008569 process Effects 0.000 claims abstract description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 16
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/08—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling structural sections, i.e. work of special cross-section, e.g. angle steel
- B21B1/085—Rail sections
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
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- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
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- C21C7/076—Use of slags or fluxes as treating agents
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- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/10—Handling in a vacuum
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- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/005—Modifying the physical properties by deformation combined with, or followed by, heat treatment of ferrous alloys
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- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
- C22C33/06—Making ferrous alloys by melting using master alloys
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- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
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Abstract
本发明公开了一种运煤专线用腐蚀钢轨,其化学成分按重量百分比包括:C:0.58%~0.66%、Si:0.38%~0.45%、Mn:0.75%~0.85%、Cu:0.50%~0.60%、Cr:0.15%~0.30%、Ni:0.25%~0.35%、P:0.015%~0.035%,其余为Fe及不可避免的杂质。还公布了其制造方法。本发明以热轧状态交货的钢轨布氏硬度:260~300(HBW),抗拉强度≥880(Rm/MPa),延伸率≥10%,在循环水加速腐蚀实验条件下,腐蚀性能为U71Mn钢轨的140%以上。
Description
技术领域
本发明涉及冶金及金属材料领域,尤其涉及一种运煤专线用腐蚀钢轨及其制造方法。
背景技术
钢轨暴露在不同的环境中会发生不同的腐蚀情况,在干燥、风沙、潮湿、闷热的地区,钢轨的腐蚀状态各不一样。我国幅员辽阔,气候条件和工业发展程度各不一样,因此,腐蚀的情况也不同。自然环境中的水、空气、酸、碱、盐、各类污染物等都是引起金属腐蚀的重要条件。目前我国运煤专线站场用钢轨腐蚀严重,列车所装载的煤中含有较多的水,装车后,煤中的水分因重力作用逐渐下渗,不断由列车缝隙流出,致使钢轨始终处于水浸状态,由于装卸煤摩擦或其他原因导致的钢轨表面氧化膜缺损,局部露出金属基面,加快钢轨的腐蚀。另外还有大量的微粒悬浮物,煤泥在浮选时需要加入一定量的浮选剂,如煤油、柴油、脂肪醇、脂肪酸等,煤残留水分中含有一定量的杂质PH值在 6.6~7.29之间变化,混有杂质的水会进一步加剧钢轨的腐蚀。
目前在提高钢轨的强度及耐蚀性上,还没有相对较成熟的、完全可以工业化的材料品种和应用技术。本发明基于这个目的开发铁道用耐腐蚀钢轨。
发明内容
为了解决上述技术问题,本发明的目的是提供一种运煤专线用腐蚀钢轨及其制造方法。
为解决上述技术问题,本发明采用如下技术方案:
一种运煤专线用腐蚀钢轨,其化学成分按重量百分比包括:C:0.58%~0.66%、Si:0.38%~0.45%、Mn:0.75%~0.85%、Cu:0.50%~0.60%、Cr:0.15%~0.30%、 Ni:0.25%~0.35%、P:0.015%~0.035%,其余为Fe及不可避免的杂质。
进一步的,其化学成分按重量百分比包括:C:0.65%、Si:0.41%、Mn:0.81%、 Cu:0.59%、Cr:0.24%、Ni:0.32%、P:0.016%,其余为Fe及不可避免的杂质。
进一步的,其化学成分按重量百分比包括:C:0.60%、Si:0.41%、Mn:0.82%、 Cu:0.50%、Cr:0.30%、Ni:0.29%、P:0.016%,其余为Fe及不可避免的杂质。
进一步的,其化学成分按重量百分比包括:C:0.66%、Si:0.45%、Mn:0.81%、 Cu:0.59%、Cr:0.24%、Ni:0.30%、P:0.016%,其余为Fe及不可避免的杂质。
一种运煤专线用腐蚀钢轨的制造方法,包括:
1)、转炉生产
为保证产品质量及对成品成分的精确控制,供转炉铁水要求:按质量百分数磷含量小于等于0.15%,硫含量小于等于0.04%;在转炉冶炼过程中加入造渣辅料,出钢过程中根据成品成分要求加入硅铁、硅锰和铝硅锰进行脱氧合金化;
2)、LF、VD炉生产
根据生产低氧钢要求,LF采用中等碱度、强还原性精炼渣处理钢水,深真空时间15~20/min;深真空度7~9/kpa软吹时间18~22/min,VD后温度 1536~1546/℃;
3)、连铸生产
连铸生产中过热度控制在15~30℃之间,拉速在0.6m/min-0.7m/min之间;
4)、钢轨轧制
严格控制钢坯的加热温度和加热时间,钢坯出炉温度为1080℃~1160℃,合理选定除鳞压力,确保每支坯料都得到有效除鳞;开轧温度控制在1080℃~ 1160℃,终轧温度控制在930℃~960℃。
与现有技术相比,本发明的有益技术效果:
本发明以热轧状态交货的钢轨布氏硬度:260~300(HBW),抗拉强度≥880 (Rm/MPa),延伸率≥10%,在循环水加速腐蚀实验条件下,腐蚀性能为U71Mn 钢轨的140%以上。
具体实施方式
一种运煤专线用腐蚀钢轨的制造方法,包括:铁水预处理—转炉冶炼—LF 精炼—VD真空处理—连铸—缓冷—加热—轧制—矫直—探伤—检查—加工—入库。
具体的工艺参数控制如下:
1、转炉生产
转炉冶炼时根据实际情况加入白灰,白云石,铁皮,出钢过程中加入矽锰,铝锰钛。
转炉终点钢水的碳含量、磷含量(质量百分数)及出钢温度如表1所示。
表1转炉出钢的成分及温度
出钢温度℃ | 拉碳含量% | 出钢磷含量% | |
最小值 | 1605 | 0.04 | 0.010 |
最大值 | 1660 | 0.12 | 0.07 |
平均值 | 1635 | 0.07 | 0.13 |
2、LF及VD炉生产
LF炉精炼根据钢水成分及温度变化进行加辅料造渣,加合金进行微调和升温操作。加入白灰,萤石,矾土,电石,合金根据精炼就位成分进行微调锰铁、硅铁,钢水温度与处理时间见表2,根据VD炉温控制真空处理时间,真空深度, VD后温度,静置时间见表3。
表2精炼LF炉温度控制
精炼就位温度℃ | 精炼离位温度℃ | 精炼处理时间min | |
最小值 | 1522 | 1613 | 25 |
最大值 | 1598 | 1650 | 58 |
平均值 | 1560 | 1626 | 39 |
表3精炼VD炉温度控制
3、连铸生产
连铸生产中过热度控制在19-30℃之间,拉速在0.60m/min-0.70m/min之间,钢坯规格为280mm×380mm。
4、钢轨轧制
严格控制钢坯的加热温度和加热时间,钢坯出炉温度为1080℃~1160℃,加热段温度1100℃~1300℃,均热段温度1100℃~1280℃,同时保证钢坯加热温度均匀。合理选定除鳞压力,确保每支坯料都得到有效除鳞。开轧温度控制在1080℃~1160℃。加热工艺如下:
表4钢坯加热工艺
钢坯表面必须经高压水除鳞;开轧温度(以BD1第二道次为主)控制在 1060℃~1130℃;钢轨矫直温度不得超过60℃,经矫直后的钢轨应平直,不得有波浪弯,硬弯和明显的扭曲,且只允许辊矫一次;钢轨要求逐支进行超声波探伤检验。钢轨全长应连续进行超声波探伤检查,不应有超过Φ2.0mm人工缺陷当量的缺陷。
实施例1:
成品钢化学成分:
表5钢轨化学成分%
成分 | C | Si | Mn | Cu | P | Cr | Ni |
0.65 | 0.41 | 0.81 | 0.59 | 0.016 | 0.24 | 0.22 |
钢轨性能:组织为珠光体+微量铁素体;踏面硬度288HB;力学性能为:抗拉强度Rm为1003MPa,延伸率A为12.5%。根据钢轨始终处于水浸状态,采用旋转挂片法按照国标GB/T18175-2000进行腐蚀试验,耐腐蚀性能为热轧U71Mn 钢轨的142%。
实施例2:
成品钢化学成分:
表6钢轨化学成分%
成分 | C | Si | Mn | Cu | P | Cr | Ni |
0.60 | 0.41 | 0.82 | 0.50 | 0.016 | 0.30 | 0.29 |
钢轨性能:组织为珠光体+微量铁素体;踏面硬度284HB;力学性能为:抗拉强度Rm为962MPa,延伸率A为12%。根据钢轨始终处于水浸状态,采用旋转挂片法按照国标GB/T18175-2000进行腐蚀试验,耐腐蚀性能为热轧U71Mn钢轨的159%。
实施例3:
成品钢化学成分:
表9钢轨化学成分%
成分 | C | Si | Mn | Cu | P | Cr | Ni |
0.66 | 0.45 | 0.81 | 0.59 | 0.016 | 0.24 | 0.30 |
钢轨性能:组织为珠光体;踏面硬度290HB;力学性能为:抗拉强度Rm为 1030MPa,延伸率A为10%。根据钢轨始终处于水浸状态,采用旋转挂片法按照国标GB/T18175-2000进行腐蚀试验,耐腐蚀性能为热轧U71Mn钢轨的151%。
以上所述的实施例仅是对本发明的优选方式进行描述,并非对本发明的范围进行限定,在不脱离本发明设计精神的前提下,本领域普通技术人员对本发明的技术方案做出的各种变形和改进,均应落入本发明权利要求书确定的保护范围内。
Claims (5)
1.一种运煤专线用腐蚀钢轨,其特征在于:其化学成分按重量百分比包括:C:0.58%~0.66%、Si:0.38%~0.45%、Mn:0.75%~0.85%、Cu:0.50%~0.60%、Cr:0.15%~0.30%、Ni:0.25%~0.35%、P:0.015%~0.035%,其余为Fe及不可避免的杂质。
2.根据权利要求1所述的运煤专线用腐蚀钢轨,其特征在于:其化学成分按重量百分比包括:C:0.65%、Si:0.41%、Mn:0.81%、Cu:0.59%、Cr:0.24%、Ni:0.32%、P:0.016%,其余为Fe及不可避免的杂质。
3.根据权利要求1所述的运煤专线用腐蚀钢轨,其特征在于:其化学成分按重量百分比包括:C:0.60%、Si:0.41%、Mn:0.82%、Cu:0.50%、Cr:0.30%、Ni:0.29%、P:0.016%,其余为Fe及不可避免的杂质。
4.根据权利要求1所述的运煤专线用腐蚀钢轨,其特征在于:其化学成分按重量百分比包括:C:0.66%、Si:0.45%、Mn:0.81%、Cu:0.59%、Cr:0.24%、Ni:0.30%、P:0.016%,其余为Fe及不可避免的杂质。
5.根据权利要求1-4任意一项所述的运煤专线用腐蚀钢轨的制造方法,其特征在于:包括:
1)、转炉生产
为保证产品质量及对成品成分的精确控制,供转炉铁水要求:按质量百分数磷含量小于等于0.15%,硫含量小于等于0.04%;在转炉冶炼过程中加入造渣辅料,出钢过程中根据成品成分要求加入硅铁、硅锰和铝硅锰进行脱氧合金化;
2)、LF、VD炉生产
根据生产低氧钢要求,LF采用中等碱度、强还原性精炼渣处理钢水,深真空时间15~20/min;深真空度7~9/kpa软吹时间18~22/min,VD后温度1536~1546/℃;
3)、连铸生产
连铸生产中过热度控制在15~30℃之间,拉速在0.6m/min-0.7m/min之间;
4)、钢轨轧制
严格控制钢坯的加热温度和加热时间,钢坯出炉温度为1080℃~1160℃,合理选定除鳞压力,确保每支坯料都得到有效除鳞;开轧温度控制在1080℃~1160℃,终轧温度控制在930℃~960℃。
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