CN112853207B - 一种涡轮增压器组件用耐热钢及其冶炼方法 - Google Patents
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- 239000010935 stainless steel Substances 0.000 claims description 11
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- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 10
- 229910052748 manganese Inorganic materials 0.000 claims description 7
- 239000011572 manganese Substances 0.000 claims description 7
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 7
- 239000010963 304 stainless steel Substances 0.000 claims description 5
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- 229910000589 SAE 304 stainless steel Inorganic materials 0.000 claims description 5
- 208000034699 Vitreous floaters Diseases 0.000 claims description 5
- 229910052786 argon Inorganic materials 0.000 claims description 5
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 5
- 239000011575 calcium Substances 0.000 claims description 5
- 229910052918 calcium silicate Inorganic materials 0.000 claims description 5
- 239000000378 calcium silicate Substances 0.000 claims description 5
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 claims description 5
- 229910052799 carbon Inorganic materials 0.000 claims description 5
- 229910052742 iron Inorganic materials 0.000 claims description 5
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- 150000002910 rare earth metals Chemical class 0.000 claims description 5
- 238000007670 refining Methods 0.000 claims description 5
- 238000005070 sampling Methods 0.000 claims description 5
- 229910052804 chromium Inorganic materials 0.000 claims description 2
- 238000001514 detection method Methods 0.000 claims description 2
- 229910052750 molybdenum Inorganic materials 0.000 claims description 2
- 229910052759 nickel Inorganic materials 0.000 claims description 2
- 229910052717 sulfur Inorganic materials 0.000 claims description 2
- 229910052721 tungsten Inorganic materials 0.000 claims description 2
- 230000003647 oxidation Effects 0.000 abstract description 6
- 238000007254 oxidation reaction Methods 0.000 abstract description 6
- 239000000203 mixture Substances 0.000 description 6
- NCJRLCWABWKAGX-UHFFFAOYSA-N [Si].[Ca].[Ba] Chemical compound [Si].[Ca].[Ba] NCJRLCWABWKAGX-UHFFFAOYSA-N 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 230000032683 aging Effects 0.000 description 2
- 230000003064 anti-oxidating effect Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
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- 230000003137 locomotive effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
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Abstract
本发明提供一种涡轮增压器组件用耐热钢,按重量百分比,其化学成分为:C:0.7%~1.3%,Si:0.5%~2%,Mn:0~1.5%,Cr:32%~40%,Ni:11%~18%,Mo:1.5%~4%,W:0.2%~1.5%,S:0~0.035%,P:0~0.035%,余量为Fe;所述耐热钢的金相组织为奥氏体基体中均匀分布M23C6、MoW和W的碳化合物的硬质点,晶粒度为2~7级。本发明的耐热钢的组织中碳化物分布均匀,具有耐高温氧化性、高温红硬性等优点;适用于工作环境为950℃以上的高温且有高温下抗氧化性;本发明的方法具有工艺简单、出品率高等优点。
Description
技术领域
本发明属于机车机械制造技术领域,具体涉及一种涡轮增压器组件用耐热钢及其冶炼方法。
背景技术
涡轮增压器中有三个壳体,包括涡轮壳、中间壳和压气机壳,其中涡轮壳及其组件与内燃机排气歧管相连,温度高达950℃以上。为了保证乘用车涡轮增压器在高温下仍然具有优良的性能,可以满足复杂工况的使用,则对涡轮增压器中一组件的金属材料的耐高温性能、抗氧化性能要求较高。随着世界各国环保要求的逐步提升,发动机废气排温越来越高,因此需要耐热温度更高的材料来代替。
发明内容
本发明的目的是提供一种涡轮增压器组件用耐热钢(Kalson-M33007)及冶炼方法,以克服现有耐热钢在高温下耐热性、耐磨性、耐蚀性等问题,满足乘用车涡轮增压器在950℃以上的高温下仍然具有优良的性能。
为了实现上述目的,本发明的技术方案如下:
本发明的一种涡轮增压器组件用耐热钢,其特征在于,按重量百分比,其化学成分为:C:0.7%~1.3%,Si:0.5%~2%,Mn:0~1.5%,Cr:32%~40%,Ni:11%~18%,Mo:1.5%~4%,W:0.2%~1.5%,S:0~0.035%,P:0~0.035%,余量为Fe。
进一步地分析,所述耐热钢的金相组织为奥氏体基体中均匀分布M23C6、MoW和W的碳化合物的硬质点,晶粒度为2~7级。
所述耐热钢的循环抗氧化温度最高可达1030℃,发生在材料表面的氧化层层厚不大于30um;此材料生产的涡轮增压器组件,可满足乘用车在1000℃工况下使用。
本发明所述的一种涡轮增压器组件用耐热钢的冶炼方法,其特征在于,包括以下步骤:
(1)依次将冶炼原料投入冶炼电炉,在压力为0.2~0.3Mpa的氩气保护环境中逐步升温化料;
(2)待所述冶炼原料全部溶于钢水后,加除渣剂打渣,升温至1500~1580℃,再加入钢水总重量0.1%~0.3%的硅钙(Ca28Si60),进行预脱氧;
(3)向所述钢水内加入打渣剂打渣,打渣1~2次,取样进行化学成分检测,当化学成分合格后,加入打渣剂覆盖钢液表面,隔绝氧气;然后继续升温至1650~1700℃,断电保温进行“镇静”精炼5~10分钟;
(4)向炉内加入钢水总重量0.2%~0.4%的硅钙钡合金进行终脱氧,除渣1~2次至钢液表面无明显暗色漂浮物;浇注得到本发明的耐热不锈钢材料。
优选地,所述冶炼原料为:增碳剂:1.0%~1.5%、微碳铬铁:48%~55%、纯铁:3%~7%、钨铁:0.9%~1.4%、钼铁:3.5%~6.5%、金属镍:11%~15%、304不锈钢:21%~25%、电解锰:0.2%~0.5%、稀土硅铁:0.3%~2.0%。
与现有技术相比,本发明具有以下优点:
本发明的耐热钢的组织中碳化物分布均匀,具有耐高温氧化性、高温红硬性等优点;适用于工作环境为950℃以上的高温且有高温下抗氧化性;本发明的方法具有工艺简单、出品率高等优点。
具体实施方式
本技术领域的一般技术人员应当认识到本实施例仅是用来说明本发明,而并非用作对本发明的限定,只要在本发明的实施范围内对实施例进行变换、变型都可在本发明权利要求的范围内。
本实施例中所用的原材料均为市售。
实施例1
实施例1的涡轮增压器中组件用耐热钢的化学成分按重量百分比列于表1中。
表1实施例1~3的化学成分及老化试验结果
该涡轮增压器组件用耐热不锈钢的冶炼步骤如下:
(1)依次将冶炼原料:增碳剂:1.06%、微碳铬铁:52%、纯铁:6.5%、钨铁:1.2%、钼铁:3.62%、金属镍:12%、304不锈钢:22.65%、电解锰:0.32%、稀土硅铁:0.63%,投入冶炼电炉,在压力为0.2Mpa的氩气保护环境中逐步升温,进行化料冶炼;
(2)待所述冶炼原料全部溶于钢水后,加除渣剂打渣,升温至1580℃,再加入钢水总重量的0.3%硅钙(Ca28Si60),进行预脱氧;
(3)钢水预脱氧后加打渣剂打渣,打渣2次,取样进行化学成分检测,当化学成分合格后,加入打渣剂,覆盖钢液表面,隔绝氧气;然后继续升温至1700℃,断电保温进行“镇静”精炼7分钟;
(4)向炉内加入钢液量的0.4%的硅钙钡合金进行终脱氧,除渣2次至钢液表面无明显暗色漂浮物;浇注得到本发明的耐热不锈钢材料。
实施例2
实施例2的涡轮增压器中组件用耐热钢的化学成分按重量百分比列于表1中。
该涡轮增压器组件用耐热不锈钢的冶炼步骤如下:
((1)依次将冶炼原料:增碳剂:1.15%、微碳铬铁:51%、纯铁:6%、钨铁:1.32%、钼铁:4.51%、金属镍:12.7%、304不锈钢:22.73%、电解锰:0.23%、稀土硅铁:0.36%,投入冶炼电炉,在压力为0.26Mpa的氩气保护环境中逐步升温,进行化料冶炼;
(2)待所述冶炼原料全部溶于钢水后,加除渣剂打渣,升温至1550℃,再加入钢水总重量的0.2%硅钙(Ca28Si60),进行预脱氧;
(3)钢水预脱氧后加打渣剂打渣,打渣2次,取样进行化学成分检测,当化学成分合格后,加入打渣剂覆盖钢液表面,隔绝氧气;然后继续升温至1680℃,断电保温进行“镇静”精炼6分钟;
(4)向炉内加入钢液量的0.3%的硅钙钡合金进行终脱氧,除渣2次至钢液表面无明显暗色漂浮物;浇注得到本发明的耐热不锈钢材料。
实施例3
实施例3的涡轮增压器中组件用耐热钢的化学成分按重量百分比列于表1中。
该涡轮增压器组件用耐热不锈钢的冶炼步骤如下:
(1)依次将冶炼原料:增碳剂:1%、微碳铬铁:52.25%、纯铁:5.53%、钨铁:0.97%、钼铁:4.13%、金属镍:12.5%、304不锈钢:22.7%、电解锰:0.38%、稀土硅铁:0.54%,投入冶炼电炉,在压力为0.3Mpa的氩气保护环境中逐步升温,进行化料冶炼;
(2)待所述冶炼原料全部溶于钢水后,加除渣剂打渣,升温至1500℃,再加入钢水总重量的0.12%硅钙(Ca28Si60),进行预脱氧;
(3)钢水预脱氧后加打渣剂打渣,打渣2次,取样进行化学成分检测,当化学成分合格后,加入打渣剂,覆盖钢液表面,隔绝氧气;然后继续升温至1660℃,断电保温进行“镇静”精炼7分钟;
(4)向炉内加入钢液量的0.3%的硅钙钡合金进行终脱氧,除渣2次至钢液表面无明显暗色漂浮物;浇注得到本发明的耐热不锈钢材料。
试验环境为温度850℃、压力0.4~0.6Mpa,试验时间120h,然后用金相显微镜观察并测量氧化膜厚度,将实施例1~3得到的耐热不锈钢材料进行老化试验,测得的氧化膜厚度均值列于表1;表2则给出了实施例1~3的耐热不锈钢材料在800℃、900℃和1000℃下测得的硬度值。
表2实施例1~3的高温下硬度值
测试温度 | 硬度单位 | 实施例1 | 实施例2 | 实施例3 |
800℃ | HV3 | 184 | 173 | 172 |
900℃ | HV3 | 119 | 118 | 117 |
1000℃ | HV3 | 71.1 | 71.3 | 73.2 |
从表1和表2可以看出,本发明的耐热不锈钢材料耐高温氧化性好,高温下红硬性优异。
Claims (3)
1.一种涡轮增压器组件用耐热钢,其特征在于,按重量百分比,其化学成分为:C:0.7%~1.3%,Si:0.5%~2%,Mn:0~0.59%,Cr:32%~40%,Ni:11%~14.5%,Mo:1.5%~2.6%,W:0.2%~0.86%,S:0~0.035%,P:0~0.035%,余量为Fe;
所述耐热钢的金相组织为奥氏体基体中均匀分布M23C6、MoW和W的碳化合物的硬质点,晶粒度为2~7级;在温度850℃、压力0.4~0.6Mpa、试验时间120h下发生在材料表面的氧化层层厚不大于30um。
2.根据权利要求1所述的涡轮增压器组件用耐热钢的冶炼方法,其特征在于,包括以下步骤:
(1)依次将冶炼原料投入冶炼电炉,在压力为0.2~0.3Mpa的氩气保护环境中逐步升温化料;
(2)待所述冶炼原料全部溶于钢水后,加除渣剂打渣,升温至1500~1580℃,再加入钢水总重量0.1%~0.3%的硅钙Ca28Si60,进行预脱氧;
(3)向所述钢水内加入打渣剂打渣,打渣1~2次,取样进行化学成分检测,当化学成分合格后,加入打渣剂覆盖钢液表面,隔绝氧气;然后继续升温至1650~1700℃,断电保温进行“镇静”精炼5~10分钟;
(4)向炉内加入钢水总重量0.2%~0.4%的硅钙钡合金进行终脱氧,除渣1~2次至钢液表面无明显暗色漂浮物;浇注得到耐热不锈钢材料。
3.根据权利要求2所述的冶炼方法,其特征在于,所述冶炼原料为:增碳剂:1.0%~1.5%、微碳铬铁:48%~55%、纯铁:3%~7%、钨铁:0.9%~1.4%、钼铁:3.5%~6.5%、金属镍:11%~15%、304不锈钢:21%~25%、电解锰:0.2%~0.5%、稀土硅铁:0.3%~2.0%。
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