CN116516250A - 一种低成本桥梁钢及其制造方法 - Google Patents
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 52
- 239000010959 steel Substances 0.000 title claims abstract description 52
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 18
- 229910052796 boron Inorganic materials 0.000 claims abstract description 19
- 239000012535 impurity Substances 0.000 claims abstract description 10
- 239000000126 substance Substances 0.000 claims abstract description 10
- 229910052720 vanadium Inorganic materials 0.000 claims abstract description 10
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 claims abstract description 9
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 9
- 238000005516 engineering process Methods 0.000 claims abstract description 9
- 229910052802 copper Inorganic materials 0.000 claims abstract description 7
- 229910052750 molybdenum Inorganic materials 0.000 claims abstract description 7
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 7
- 229910000859 α-Fe Inorganic materials 0.000 claims abstract description 6
- 238000001816 cooling Methods 0.000 claims description 41
- 238000005275 alloying Methods 0.000 claims description 20
- 238000005096 rolling process Methods 0.000 claims description 15
- 238000009489 vacuum treatment Methods 0.000 claims description 15
- 238000003756 stirring Methods 0.000 claims description 11
- 238000003723 Smelting Methods 0.000 claims description 10
- 238000010438 heat treatment Methods 0.000 claims description 10
- 238000010079 rubber tapping Methods 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 7
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 6
- 238000005266 casting Methods 0.000 claims description 6
- 229910052749 magnesium Inorganic materials 0.000 claims description 6
- 239000011777 magnesium Substances 0.000 claims description 6
- SNAAJJQQZSMGQD-UHFFFAOYSA-N aluminum magnesium Chemical compound [Mg].[Al] SNAAJJQQZSMGQD-UHFFFAOYSA-N 0.000 claims description 5
- 238000009749 continuous casting Methods 0.000 claims description 5
- 238000010008 shearing Methods 0.000 claims description 5
- 230000003068 static effect Effects 0.000 claims description 5
- 238000010521 absorption reaction Methods 0.000 claims description 2
- 229910001563 bainite Inorganic materials 0.000 claims description 2
- 238000005452 bending Methods 0.000 claims description 2
- 229910052748 manganese Inorganic materials 0.000 claims description 2
- 229910001562 pearlite Inorganic materials 0.000 claims description 2
- 229910045601 alloy Inorganic materials 0.000 abstract description 5
- 239000000956 alloy Substances 0.000 abstract description 5
- 239000002131 composite material Substances 0.000 abstract description 3
- 150000001875 compounds Chemical class 0.000 abstract description 2
- 229910052758 niobium Inorganic materials 0.000 abstract description 2
- 239000010955 niobium Substances 0.000 abstract description 2
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 abstract description 2
- 230000001737 promoting effect Effects 0.000 abstract description 2
- 239000006104 solid solution Substances 0.000 abstract description 2
- 239000000047 product Substances 0.000 description 6
- 238000003466 welding Methods 0.000 description 4
- 238000001514 detection method Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009440 infrastructure construction Methods 0.000 description 1
- 238000009869 magnesium metallurgy Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000005496 tempering Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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Abstract
本发明公开了一种低成本桥梁钢及其制造方法,涉及钢铁生产技术领域,其化学成分及质量百分比如下:C:0.10%~0.16%,Si:0.15%~0.35%,Mn:1.20%~1.60%,P≤0.018%,S≤0.005%,Nb:0.020%~0.040%,V:0.020%~0.050%,Ti:0.008%~0.030%,Cr≤0.05%,Ni≤0.05%,Mo≤0.05%,Cu≤0.05%,B:0.0005%~0.0020%,Mg:0.0008%~0.0015%,Al:0.015%~0.030%,余量为Fe和不可避免的杂质。采用了Nb‑Ti‑B复合合金技术,形成碳氮化铌化合物同时,微量的硼对晶界固溶钉扎,并析出少量的BN,促进了铁素体的生成,提升了产品的强度与韧性,减少了Cr、Ni、Mo、Cu等贵重元素的使用量,降低了合金设计成本。
Description
技术领域
本发明涉及钢铁生产技术领域,特别是涉及一种低成本桥梁钢及其制造方法。
背景技术
随着我国经济的高速发展,基础设施建设也获得了大力发展,其中桥梁行业发展日新月异,随着桥梁质量的不断提升,重载、高速、大跨度成为了主要发展方向,高强度、高韧性、低屈强比、易焊接等多项性能为一体的新一代高性能桥梁钢是大跨重载铁路钢桥关键构件的首选材料,需求明确而迫切。
桥梁质量的不断提升,要求钢材质量有质的变化,尤其是特厚桥梁钢,在保证强度前提下,其-40℃低温冲击需要达到120J以上非常困难,同时还需要兼顾钢板的加工性能、焊接性能。因此,开发出高效易于焊接的桥梁产品,对企业的后续发展至关重要。
发明内容
本发明针对上述技术问题,克服现有技术的缺点,提供一种低成本桥梁钢,其化学成分及质量百分比如下:C:0.10%~0.16%,Si:0.15%~0.35%,Mn:1.20%~1.60%,P≤0.018%,S≤0.005%,Nb:0.020%~0.040%,V:0.020%~0.050%,Ti:0.008%~0.030%,Cr≤0.05%,Ni≤0.05%,Mo≤0.05%,Cu≤0.05%,B:0.0005%~0.0020%,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:
前所述的一种低成本桥梁钢,其化学成分及质量百分比如下:C:0.12~0.13%,Si:0.25%~0.35%,Mn:1.40%~1.60%,P≤0.015%,S≤0.003%,Nb:0.030%~0.040%,V:0.020%~0.030%,Ti:0.010%~0.020%,Cr≤0.05%,Ni≤0.05%,Mo≤0.05%,Cu≤0.05%,B:0.0008%~0.0012%,Mg:0.0010%~0.0013%,Al:0.020%~0.025%,余量为Fe和不可避免的杂质。
前所述的一种低成本桥梁钢,其化学成分及质量百分比如下:C:0.12%~0.15%,Si:0.20%~0.25%,Mn:1.30%~1.50%,P≤0.015%,S≤0.002%,Nb:0.025%~0.035%,V:0.030%~0.040%,Ti:0.015%~0.030%,Cr≤0.05%,Ni≤0.05%,Mo≤0.05%,Cu≤0.05%,B:0.0018%~0.0020%,Mg:0.0009%~0.0013%,Al:0.018%~0.028%,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低成本桥梁钢制造方法,包括以下步骤:
S1、采用冶炼炉冶炼,出钢温度1620~1680度,出钢过程进行脱氧合金化操作,同时加入硼铁,进行硼合金化;
S2、钢水到达LF炉后按要求进行合金化操作,脱氧合金化结束后送至RH进行真空处理,真空时间15~18min,真空后煨入镁铝线200~230米,镁处理后进行静搅12~15min;
S3、钢水到达连铸后进行浇铸,过热度30~40度,采用电磁搅拌技术,采用弱冷模式进行冷却,动态轻压下尽量后移;
S4、坯料堆冷后送至加热炉加热,加热温度1200±50度,加热时间10~15min/cm;
S5、采用二阶段轧制工艺,二开温度880~950度,终轧温度790~870度,开冷温度750~830度,返红温度550~650度;
S7、轧件下冷床直接进行堆冷,堆冷时间10~20小时,堆冷结束后进行矫直、剪切、标识、探伤、入库。
前所述的一种低成本桥梁钢制造方法,成品钢板厚度为5~80mm。
前所述的一种低成本桥梁钢制造方法,钢板金相组织为以粒状贝氏体+铁素体+珠光体为主。
前所述的一种低成本桥梁钢制造方法,钢级为Q235~Q370MPa,钢板各项性能为:屈服强度225~370MPa,抗拉强度400~510MPa,断后延伸率>20%,-40度冲击吸收功>47J,180度弯曲外表面无肉眼可见裂纹。
本发明的有益效果是:
(1)本发明采用了Nb-Ti-B复合合金技术,形成碳氮化铌化合物同时,微量的硼对晶界固溶钉扎,并析出少量的BN,促进了铁素体的生成,提升了产品的强度与韧性,减少了Cr、Ni、Mo、Cu等贵重元素的使用量,降低了合金设计成本,提升了市场竞争力;
(2)本发明采用镁冶金技术,强化了B元素的使用效果,镁元素的应用减少了硫化物危害,提升了硼元素的利用率,稳定了产品的力学性能,同时也提升了产品的焊接性能,提升了桥梁钢的使用效果;
(3)本发明采用高过热度配合使用电磁搅拌技术,使用了弱冷模式,可以均匀铸坯冷却的晶粒度,保证硼元素更大程度地固溶在铁素体晶粒中,轧制后的析出在晶粒间,提升产品的强度及淬透性;
(4)本发明中Nb-Ti-B复合合金的使用可以保证在块状铁素体的周围形成更多的M/A组元,从而提升产品的焊接性能;
(5)本发明中高返红的钢板直接下线堆冷,能起到自回火的作用,可以改善钢板的内应力,均匀组织及性能,同时也减少制造成本。
附图说明
图1为钢板金相组织图。
实施方式
实施例
本实施例提供的一种低成本桥梁钢,厚度9mm,其化学成分及质量百分比如下:C:0.13%,Si:0.23%,Mn:1.31%,P:0.009%,S:0.002%,Nb:0.031%,V:0.043%,Ti:0.018%,Cr:0.02%,Ni:0.02%,Mo:0.05%,Cu:0.02%,B:0.0009%,Mg:0.0011%,Al:0.021%,余量为Fe和不可避免的杂质。
制造方法包括以下步骤:
S1、采用冶炼炉冶炼,出钢温度1651度,出钢过程进行脱氧合金化操作,同时加入硼铁,进行硼合金化;
S2、钢水到达LF炉后按要求进行合金化操作,脱氧合金化结束后送至RH进行真空处理,真空时间17min,真空后煨入镁铝线210米,镁处理后进行静搅13min;
S3、钢水到达连铸后进行浇铸,过热度33度,采用电磁搅拌技术,采用弱冷模式进行冷却,动态轻压下尽量后移;
S4、坯料堆冷后送至加热炉加热,加热温度1231度,加热时间13min/cm;
S5、采用二阶段轧制工艺,二开温度896度,终轧温度830度,开冷温度790度,返红温度590度;
S7、轧件下冷床直接进行堆冷,堆冷时间16小时,堆冷结束后进行矫直、剪切、标识、探伤、入库。
实施例
本实施例提供的一种低成本桥梁钢,厚度55mm,其化学成分及质量百分比如下:C:0.12%,Si:0.17%,Mn:1.55%,P:0.011%,S:0.001%,Nb:0.026%,V:0.043%,Ti:0.023%,Cr:0.02%,Ni:0.03%,Mo:0.0:2%,Cu:0.02%,B:0.0007%,Mg:0.0011%,Al:0.019%,余量为Fe和不可避免的杂质。
制造方法包括以下步骤:
S1、采用冶炼炉冶炼,出钢温度1669度,出钢过程进行脱氧合金化操作,同时加入硼铁,进行硼合金化;
S2、钢水到达LF炉后按要求进行合金化操作,脱氧合金化结束后送至RH进行真空处理,真空时间16min,真空后煨入镁铝线220米,镁处理后进行静搅15min;
S3、钢水到达连铸后进行浇铸,过热度36度,采用电磁搅拌技术,采用弱冷模式进行冷却,动态轻压下尽量后移;
S4、坯料堆冷后送至加热炉加热,加热温度1206度,加热时间115min/cm;
S5、采用二阶段轧制工艺,二开温度886度,终轧温度798度,开冷温度770度,返红温度560度;
S7、轧件下冷床直接进行堆冷,堆冷时间12小时,堆冷结束后进行矫直、剪切、标识、探伤、入库。
实施例
本实施例提供的一种低成本桥梁钢,厚度68mm,其化学成分及质量百分比如下:C:0.15%,Si:0.33%,Mn:1.53%,P:0.015%,S:0.002%,Nb:0.031%,V:0.041%,Ti:0.009%,Cr:0.01%,Ni:0.02%,Mo:0.03%,Cu:0.02%,B:0.0013%,Mg:0.0010%,Al:0.022%,余量为Fe和不可避免的杂质。
制造方法包括以下步骤:
S1、采用冶炼炉冶炼,出钢温度1636度,出钢过程进行脱氧合金化操作,同时加入硼铁,进行硼合金化;
S2、钢水到达LF炉后按要求进行合金化操作,脱氧合金化结束后送至RH进行真空处理,真空时间16min,真空后煨入镁铝线210米,镁处理后进行静搅13min;
S3、钢水到达连铸后进行浇铸,过热度37度,采用电磁搅拌技术,采用弱冷模式进行冷却,动态轻压下尽量后移;
S4、坯料堆冷后送至加热炉加热,加热温度1209度,加热时间13min/cm;
S5、采用二阶段轧制工艺,二开温度883度,终轧温度797度,开冷温度759度,返红温度5553度;
S7、轧件下冷床直接进行堆冷,堆冷时间18小时,堆冷结束后进行矫直、剪切、标识、探伤、入库。
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)
1.一种低成本桥梁钢,其特征在于:其化学成分及质量百分比如下:C:0.10%~0.16%,Si:0.15%~0.35%,Mn:1.20%~1.60%,P≤0.018%,S≤0.005%,Nb:0.020%~0.040%,V:0.020%~0.050%,Ti:0.008%~0.030%,Cr≤0.05%,Ni≤0.05%,Mo≤0.05%,Cu≤0.05%,B:0.0005%~0.0020%,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所述的一种低成本桥梁钢,其特征在于:其化学成分及质量百分比如下:C:0.12~0.13%,Si:0.25%~0.35%,Mn:1.40%~1.60%,P≤0.015%,S≤0.003%,Nb:0.030%~0.040%,V:0.020%~0.030%,Ti:0.010%~0.020%,Cr≤0.05%,Ni≤0.05%,Mo≤0.05%,Cu≤0.05%,B:0.0008%~0.0012%,Mg:0.0010%~0.0013%,Al:0.020%~0.025%,余量为Fe和不可避免的杂质。
3.根据权利要求1所述的一种低成本桥梁钢,其特征在于:其化学成分及质量百分比如下:C:0.12%~0.15%,Si:0.20%~0.25%,Mn:1.30%~1.50%,P≤0.015%,S≤0.002%,Nb:0.025%~0.035%,V:0.030%~0.040%,Ti:0.015%~0.030%,Cr≤0.05%,Ni≤0.05%,Mo≤0.05%,Cu≤0.05%,B:0.0018%~0.0020%,Mg:0.0009%~0.0013%,Al:0.018%~0.028%,余量为Fe和不可避免的杂质。
4.一种低成本桥梁钢制造方法,其特征在于:应用于权利要求1-3任意一项,包括以下步骤:
S1、采用冶炼炉冶炼,出钢温度1620~1680度,出钢过程进行脱氧合金化操作,同时加入硼铁,进行硼合金化;
S2、钢水到达LF炉后按要求进行合金化操作,脱氧合金化结束后送至RH进行真空处理,真空时间15~18min,真空后煨入镁铝线200~230米,镁处理后进行静搅12~15min;
S3、钢水到达连铸后进行浇铸,过热度30~40度,采用电磁搅拌技术,采用弱冷模式进行冷却,动态轻压下尽量后移;
S4、坯料堆冷后送至加热炉加热,加热温度1200±50度,加热时间10~15min/cm;
S5、采用二阶段轧制工艺,二开温度880~950度,终轧温度790~870度,开冷温度750~830度,返红温度550~650度;
S7、轧件下冷床直接进行堆冷,堆冷时间10~20小时,堆冷结束后进行矫直、剪切、标识、探伤、入库。
5.根据权利要求4所述的一种低成本桥梁钢制造方法,其特征在于:成品钢板厚度为5~80mm。
6.根据权利要求4所述的一种低成本桥梁钢制造方法,其特征在于:钢板金相组织为以粒状贝氏体+铁素体+珠光体为主。
7.根据权利要求4所述的一种低成本桥梁钢制造方法,其特征在于:钢级为Q235~Q370MPa,钢板各项性能为:屈服强度225~370MPa,抗拉强度400~510MPa,断后延伸率>20%,-40度冲击吸收功>47J,180度弯曲外表面无肉眼可见裂纹。
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