CN116426831A - 一种厚壁低温深海管线用钢及其生产方法 - Google Patents
一种厚壁低温深海管线用钢及其生产方法 Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 60
- 239000010959 steel Substances 0.000 title claims abstract description 60
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 20
- 238000005096 rolling process Methods 0.000 claims abstract description 48
- 238000005266 casting Methods 0.000 claims abstract description 31
- 238000005516 engineering process Methods 0.000 claims abstract description 16
- 239000012535 impurity Substances 0.000 claims abstract description 13
- 239000000126 substance Substances 0.000 claims abstract description 8
- 229910052720 vanadium Inorganic materials 0.000 claims abstract description 8
- 238000003723 Smelting Methods 0.000 claims abstract description 6
- 229910000859 α-Fe Inorganic materials 0.000 claims abstract description 5
- 229910001563 bainite Inorganic materials 0.000 claims abstract description 3
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 3
- 229910001568 polygonal ferrite Inorganic materials 0.000 claims abstract description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 17
- 238000010438 heat treatment Methods 0.000 claims description 15
- 238000010079 rubber tapping Methods 0.000 claims description 10
- 238000003756 stirring Methods 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 7
- 229910045601 alloy Inorganic materials 0.000 claims description 6
- 239000000956 alloy Substances 0.000 claims description 6
- 238000001816 cooling Methods 0.000 claims description 6
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 5
- 229910052782 aluminium Inorganic materials 0.000 claims description 5
- SNAAJJQQZSMGQD-UHFFFAOYSA-N aluminum magnesium Chemical compound [Mg].[Al] SNAAJJQQZSMGQD-UHFFFAOYSA-N 0.000 claims description 5
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 5
- 238000007664 blowing Methods 0.000 claims description 5
- 238000009749 continuous casting Methods 0.000 claims description 5
- 238000007872 degassing Methods 0.000 claims description 5
- 230000003009 desulfurizing effect Effects 0.000 claims description 5
- 238000007689 inspection Methods 0.000 claims description 5
- 229910052742 iron Inorganic materials 0.000 claims description 5
- 229910052760 oxygen Inorganic materials 0.000 claims description 5
- 239000001301 oxygen Substances 0.000 claims description 5
- 238000007670 refining Methods 0.000 claims description 5
- 238000010008 shearing Methods 0.000 claims description 5
- 239000002893 slag Substances 0.000 claims description 5
- 238000009489 vacuum treatment Methods 0.000 claims description 5
- 239000011777 magnesium Substances 0.000 claims description 4
- 229910052759 nickel Inorganic materials 0.000 claims description 4
- 229910052750 molybdenum Inorganic materials 0.000 claims description 3
- 238000003825 pressing Methods 0.000 description 5
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 4
- 229910052717 sulfur Inorganic materials 0.000 description 3
- 239000013078 crystal Substances 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000003921 oil Substances 0.000 description 2
- 238000005204 segregation Methods 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000010779 crude oil Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009869 magnesium metallurgy Methods 0.000 description 1
- 229910052758 niobium Inorganic materials 0.000 description 1
- 229910052596 spinel Inorganic materials 0.000 description 1
- 239000011029 spinel Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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Abstract
本发明公开了一种厚壁低温深海管线用钢及其生产方法,涉及钢铁生产技术领域,其化学成分及质量百分比如下:C:0.03%~0.07%,Si:0.10%~0.30%,Mn:1.30%~1.70%,P≤0.015%,S≤0.002%,Nb:0.030%~0.060%,V≤0.03%,Ti:0.008%~0.030%,Cr:0.10%~0.30%,Ni≤0.30%,Mo:0.08%~0.20%,Cu≤0.30%,B≤0.0005%,Mg:0.0008%~0.0015%,Al:0.015%~0.030%,余量为Fe和不可避免的杂质。采用宽厚断面冶炼,获得纯净度高低倍组织优异的铸坯,采用高温奥氏体化工艺配合大压下轧制技术,获得以多边形铁素体+针状铁素体+贝氏体的多相组织类型,满足厚壁低温深海管线用钢的性能要求。
Description
技术领域
本发明涉及钢铁生产技术领域,特别是涉及一种厚壁低温深海管线用钢及其生产方法。
背景技术
随着世界经济的发展,世界各国对油气的需求越来越大,其中国与国之间的油气输送难度大成本高。采用管道输送质优价廉,国与国之间的输送通道中有很多海洋区域,海底管道输送对管线钢材质要求高,需要考虑洋流的影响,并且材质需要有良好的低温止裂性能。因为原油输送过程中需要进行增压操作,厚底管线得到了广泛应用。
厚壁管线钢不但需要满足产品的横纵向拉伸性能,同时要求具有良好的低温冲击韧性及DWTT低温止裂性能。因此,提高产品的低温韧性,设计满足性能要求的厚壁深海管线用钢是扩展国内及国际市场的重要途径。
发明内容
本发明针对上述技术问题,克服现有技术的缺点,提供一种厚壁低温深海管线用钢,其化学成分及质量百分比如下:C:0.03%~0.07%,Si:0.10%~0.30%,Mn:1.30%~1.70%,P≤0.015%,S≤0.002%,Nb:0.030%~0.060%,V≤0.03%,Ti:0.008%~0.030%,Cr:0.10%~0.30%,Ni≤0.30%,Mo:0.08%~0.20%,Cu≤0.30%,B≤0.0005%,Mg:0.0008%~0.0015%,Al:0.015%~0.030%,余量为Fe和不可避免的杂质。
本发明进一步限定的技术方案是:
前所述的一种厚壁低温深海管线用钢,其化学成分及质量百分比如下:C:0.05%~0.06%,Si:0.15%~0.20%,Mn:1.40%~1.60%,P≤0.013%,S≤0.0015%,Nb:0.040%~0.050%,V≤0.03%,Ti:0.015%~0.020%,Cr:0.15%~0.20%,Ni:0.10%~0.15%,Mo:0.15%~0.18%,Cu≤0.30%,B≤0.0005%,Mg:0.0010%~0.0013%,Al:0.015%~0.030%,余量为Fe和不可避免的杂质。
本发明的另一目的在于提供一种厚壁低温深海管线用钢生产方法,包括以下步骤:
S1、采用KR法进行脱硫,铁水入炉后采用顶底复吹技术冶炼,转炉出钢温度1600~1660度,出钢氧含量500~800ppm,采用杂灰+精炼渣进行造渣,采用铝块进行脱氧;
S2、钢水到达精炼LF+RH进行脱氧合金及真空处理,RH脱气后喂入镁铝线280~300米;
S3、精炼后钢水送至宽厚板坯进行浇铸,浇铸过热度20~40度,连铸机水平段进行动态轻压下,压下量6~8mm,在铸机的第2#、3#辊进行间隔电磁搅拌;
S4、铸坯表检后进行奥氏体化加热,加热温度1180~1220度,加热时间9.0~13℃/cm;
S5、粗轧温度1100~1130度,加大初轧轧制力,展宽后压下量26~32cm,后三道压下率≥20%,末道次压下率≥22%;
S6、采用二阶段轧制技术轧制,二开温度750~790度,终轧温度750~770度,开冷温度720~750度,返红温度300~400度;
S7、钢板剪切、标识、探伤后入库发货。
前所述的一种厚壁低温深海管线用钢生产方法,步骤S3中,采用铸机断面厚度260~460cm,浇铸断面≥260mm。
前所述的一种厚壁低温深海管线用钢生产方法,步骤S3中,电磁搅拌间隔频次6秒,电流设定350~390A,频率6.0HZ。
前所述的一种厚壁低温深海管线用钢生产方法,厚壁低温深海管线用钢成品壁厚为22~50cm。
前所述的一种厚壁低温深海管线用钢生产方法,成品钢组织为多边形铁素体+针状铁素体+贝氏体的多相组织类型。
本发明的有益效果是:
(1)本发明采用低碳设计,提高铁素体含量,有效改善低温韧性;适当降低Nb、Ni含量,降低了产品的合金成本,且不添加镍元素;采用Cr、Mo设计,可以改善厚壁规格的淬透性,提升产品厚度方向的组织均匀性;
(2)本发明采用镁冶金技术,促进形成镁铝尖晶石类夹杂物,不但可以降低钢中夹杂物数量,形成不大于10μm的夹杂物,提升钢板的强度与韧性,还可以减少MnS夹杂的生产,球化A类夹杂物,提升钢水的纯净度;
(3)本发明采用水平度压下工艺,改善了铸坯宽度方向的组织均匀性,提高了宽度方向的性能稳定性,采用大压下工艺,可以促进柱状晶的生成,改进钢板的位错强度;
(4)本发明采用了间隔电磁搅拌技术,可以避免心部的组织偏析,也可以解决厚度1/4处的负偏析,提升了钢板厚度1/4处低温冲击韧性,保证了钢板-20度环境下冲击均值达到450J以上,产品性能富裕量得到了大幅度的提升;
(5)本发明采用1180~1220℃度奥氏体化温度,有效提升了铸坯在初轧阶段的压下率,与铸坯柱状晶形成了完美配合,提升了组织位错性能,改善了产品的低温韧性,提升了厚壁低温管线的低温冲击及落锤性能,实现了厚壁低温深海管线的低温韧性要求;
(6)本发明采用二阶段轧制技术及低温冷却技术,保证了产品接近双项组织区域轧制,可以有效细化组织晶粒度,提升铁素体生成量改善组织韧性,提升产品的低温韧性要求。
附图说明
图1为本发明金相组织图。
实施方式
实施例
本实施例提供的一种厚壁低温深海管线用钢,产品厚度规格35mm,其化学成分及质量百分比如下:C:0.055%,Si:0.19%,Mn:1.53%,P:0.010%,S:0.0011%,Nb:0.045%,V:0.001%,Ti:0.015%,Cr:0.17%,Ni:0.18%,Mo:0.13%,Cu:0.005%,B:0.0002%,Mg:0.0013%,Al:0.027%,余量为Fe和不可避免的杂质。
生产方法包括以下步骤:
S1、采用KR法进行脱硫,铁水入炉后采用顶底复吹技术冶炼,转炉出钢温度1631度,出钢氧含量630ppm,采用杂灰+精炼渣进行造渣,采用铝块进行脱氧;
S2、钢水到达精炼LF+RH进行脱氧合金及真空处理,RH脱气后喂入镁铝线290米;
S3、精炼后钢水送至宽厚板坯进行浇铸,浇铸断面≥260mm,浇铸过热度31度,连铸机水平段进行动态轻压下,压下量7mm,在铸机的第2#、3#辊进行间隔电磁搅拌,间隔频次6秒,电流设定370A,频率6.0HZ;
S4、铸坯表检后进行奥氏体化加热,加热温度1196度,加热时间10℃/cm;
S5、粗轧温度1126度,加大初轧轧制力,展宽后压下量29cm,后三道压下率≥20%,末道次压下率23%;
S6、采用二阶段轧制技术轧制,二开温度768度,终轧温度753度,开冷温度731度,返红温度363度;
S7、钢板剪切、标识、探伤后入库发货。
实施例
本实施例提供的一种厚壁低温深海管线用钢,产品厚度规格30mm,其化学成分及质量百分比如下:C:0.035%,Si:0.26%,Mn:1.43%,P:0.011%,S:0.0011%,Nb:0.039%,V:0.002%,Ti:0.0210%,Cr:0.230%,Ni:0.03%,Mo:0.13%,Cu:0.01%,B:0.0001%,Mg:0.0009%,Al:0.023%,余量为Fe和不可避免的杂质。
生产方法包括以下步骤:
S1、采用KR法进行脱硫,铁水入炉后采用顶底复吹技术冶炼,转炉出钢温度1633度,出钢氧含量750ppm,采用杂灰+精炼渣进行造渣,采用铝块进行脱氧;
S2、钢水到达精炼LF+RH进行脱氧合金及真空处理,RH脱气后喂入镁铝线300米;
S3、精炼后钢水送至宽厚板坯进行浇铸,浇铸断面≥260mm,浇铸过热度20~40度,连铸机水平段进行动态轻压下,压下量8mm,在铸机的第2#、3#辊进行间隔电磁搅拌,间隔频次6秒,电流设定380A,频率6.0HZ;
S4、铸坯表检后进行奥氏体化加热,加热温度1210度,加热时间12℃/cm;
S5、粗轧温度1119度,加大初轧轧制力,展宽后压下量27cm,后三道压下率≥20%,末道次压下率24%;
S6、采用二阶段轧制技术轧制,二开温度778度,终轧温度767度,开冷温度741度,返红温度320度;
S7、钢板剪切、标识、探伤后入库发货。
实施例
本实施例提供的一种厚壁低温深海管线用钢,产品厚度规格20mm,其化学成分及质量百分比如下:C:0.042%,Si:0.19%,Mn:1.50%,P:0.009%,S:0.0011%,Nb:0.047%,V:0.002%,Ti:0.017%,Cr:0.19%,Ni:0.23%,Mo:0.17%,Cu:0.02%,B:0.0003%,Mg:0.0014%,Al:0.0270%,余量为Fe和不可避免的杂质。
生产方法包括以下步骤:
S1、采用KR法进行脱硫,铁水入炉后采用顶底复吹技术冶炼,转炉出钢温度1623度,出钢氧含量630ppm,采用杂灰+精炼渣进行造渣,采用铝块进行脱氧;
S2、钢水到达精炼LF+RH进行脱氧合金及真空处理,RH脱气后喂入镁铝线280米;
S3、精炼后钢水送至宽厚板坯进行浇铸,浇铸断面≥260mm,浇铸过热度26度,连铸机水平段进行动态轻压下,压下量6mm,在铸机的第2#、3#辊进行间隔电磁搅拌,间隔频次6秒,电流设定380A,频率6.0HZ;
S4、铸坯表检后进行奥氏体化加热,加热温度1193度,加热时间12℃/cm;
S5、粗轧温度1120度,加大初轧轧制力,展宽后压下量29cm,后三道压下率≥20%,末道次压下率23%;
S6、采用二阶段轧制技术轧制,二开温度780度,终轧温度768度,开冷温度733度,返红温度373度;
S7、钢板剪切、标识、探伤后入库发货。
实施例1、2、3钢板性能如下:
除上述实施例外,本发明还可以有其他实施方式。凡采用等同替换或等效变换形成的技术方案,均落在本发明要求的保护范围。
Claims (7)
1.一种厚壁低温深海管线用钢,其特征在于:其化学成分及质量百分比如下:C:0.03%~0.07%,Si:0.10%~0.30%,Mn:1.30%~1.70%,P≤0.015%,S≤0.002%,Nb:0.030%~0.060%,V≤0.03%,Ti:0.008%~0.030%,Cr:0.10%~0.30%,Ni≤0.30%,Mo:0.08%~0.20%,Cu≤0.30%,B≤0.0005%,Mg:0.0008%~0.0015%,Al:0.015%~0.030%,余量为Fe和不可避免的杂质。
2.根据权利要求1所述的一种厚壁低温深海管线用钢,其特征在于:其化学成分及质量百分比如下:C:0.05%~0.06%,Si:0.15%~0.20%,Mn:1.40%~1.60%,P≤0.013%,S≤0.0015%,Nb:0.040%~0.050%,V≤0.03%,Ti:0.015%~0.020%,Cr:0.15%~0.20%,Ni:0.10%~0.15%,Mo:0.15%~0.18%,Cu≤0.30%,B≤0.0005%,Mg:0.0010%~0.0013%,Al:0.015%~0.030%,余量为Fe和不可避免的杂质。
3.一种厚壁低温深海管线用钢生产方法,其特征在于:应用于权利要求1或2,包括以下步骤:
S1、采用KR法进行脱硫,铁水入炉后采用顶底复吹技术冶炼,转炉出钢温度1600~1660度,出钢氧含量500~800ppm,采用杂灰+精炼渣进行造渣,采用铝块进行脱氧;
S2、钢水到达精炼LF+RH进行脱氧合金及真空处理,RH脱气后喂入镁铝线280~300米;
S3、精炼后钢水送至宽厚板坯进行浇铸,浇铸过热度20~40度,连铸机水平段进行动态轻压下,压下量6~8mm,在铸机的第2#、3#辊进行间隔电磁搅拌;
S4、铸坯表检后进行奥氏体化加热,加热温度1180~1220度,加热时间9.0~13℃/cm;
S5、粗轧温度1100~1130度,加大初轧轧制力,展宽后压下量26~32cm,后三道压下率≥20%,末道次压下率≥22%;
S6、采用二阶段轧制技术轧制,二开温度750~790度,终轧温度750~770度,开冷温度720~750度,返红温度300~400度;
S7、钢板剪切、标识、探伤后入库发货。
4.根据权利要求3所述的一种厚壁低温深海管线用钢生产方法,其特征在于:所述步骤S3中,采用铸机断面厚度260~460cm,浇铸断面≥260mm。
5.根据权利要求3所述的一种厚壁低温深海管线用钢生产方法,其特征在于:所述步骤S3中,电磁搅拌间隔频次6秒,电流设定350~390A,频率6.0HZ。
6.根据权利要求3所述的一种厚壁低温深海管线用钢生产方法,其特征在于:成品钢壁厚为22~50cm。
7.根据权利要求3所述的一种厚壁低温深海管线用钢生产方法,其特征在于:成品钢组织为多边形铁素体+针状铁素体+贝氏体的多相组织类型。
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