CN116334470A - 一种高强结构钢sgc570的生产方法 - Google Patents
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 24
- 229910000746 Structural steel Inorganic materials 0.000 title claims abstract description 21
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 36
- 239000010959 steel Substances 0.000 claims abstract description 36
- 238000005096 rolling process Methods 0.000 claims abstract description 19
- 238000005097 cold rolling Methods 0.000 claims abstract description 13
- 238000005266 casting Methods 0.000 claims abstract description 9
- 238000000034 method Methods 0.000 claims abstract description 9
- 230000008569 process Effects 0.000 claims abstract description 9
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- 238000005098 hot rolling Methods 0.000 claims abstract description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 6
- 238000007730 finishing process Methods 0.000 claims abstract description 6
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- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 4
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- 238000003466 welding Methods 0.000 claims description 4
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 3
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- 229910052725 zinc Inorganic materials 0.000 claims description 3
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- CYUOWZRAOZFACA-UHFFFAOYSA-N aluminum iron Chemical compound [Al].[Fe] CYUOWZRAOZFACA-UHFFFAOYSA-N 0.000 claims description 2
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- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 2
- 238000005261 decarburization Methods 0.000 claims description 2
- 238000005516 engineering process Methods 0.000 claims description 2
- DALUDRGQOYMVLD-UHFFFAOYSA-N iron manganese Chemical compound [Mn].[Fe] DALUDRGQOYMVLD-UHFFFAOYSA-N 0.000 claims description 2
- 229910052760 oxygen Inorganic materials 0.000 claims description 2
- 239000001301 oxygen Substances 0.000 claims description 2
- 230000009467 reduction Effects 0.000 claims description 2
- 238000007670 refining Methods 0.000 claims description 2
- 238000005260 corrosion Methods 0.000 abstract description 4
- 230000007797 corrosion Effects 0.000 abstract description 4
- 229910052799 carbon Inorganic materials 0.000 description 4
- 229910001335 Galvanized steel Inorganic materials 0.000 description 3
- 239000008397 galvanized steel Substances 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 238000000137 annealing Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
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- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/30—Regulating or controlling the blowing
- C21C5/35—Blowing from above and through the bath
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- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0075—Treating in a ladle furnace, e.g. up-/reheating of molten steel within the ladle
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- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
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- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
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- C21D8/0226—Hot rolling
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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Abstract
本发明公开了一种高强结构钢SGC570的生产方法,包括(1)冶炼—连铸生产工艺流程:铁水预处理—转炉—LF精炼—板坯连铸;(2)热轧生产工艺流程:铸坯加热—粗轧—精轧—卷取;(3)酸洗冷轧工艺流程;(4)连续热镀锌、光整工艺流程。本发明生产的产品具有高强度、高硬度、耐腐蚀等特点,生产成本低,易与普通钢材衔接,满足建筑用钢选材的需要。力学性能:屈服强度ReL≥560MPa,抗拉强度Rm≥570MPa。
Description
技术领域
本发明涉及冶金板材技术领域,尤其涉及一种高强结构钢SGC570的生产方法。
背景技术
全面推广高强度结构钢,可以在满足产品使用要求的前提下减少钢材的总用量,从而助力钢铁行业实现“碳达峰、碳中和”。高强结构钢SGC570是连续热镀锌结构用钢中强度最高的牌号,其屈服强度要求达到560MPa以上,抗拉强度要求达到570MPa以上,且因镀锌钢带具有良好的耐腐蚀性,广泛应用于建筑行业。
生产高强度镀锌钢带SGC570既要考虑满足性能、锌层重量要求,也要兼顾制造成本。目前结构用高强度镀锌钢带可采用普通碳素钢中增加Mn、Nb、Ti、Cr等元素以提高产品强度,但明显增加生产成本并且恶化镀锌性能;也可采用不完全退火工艺满足强度要求,以低成本方案实现产品生产及应用。
目前,首钢生产的结构钢S550GD+Z(一种结构用高强钢S550GD+Z的生产方法,申请号201110149959.8)成分设计中C(0.15~0.30%)、Mn(1~2%)含量较高,与本发明成分设计不同,C、Mn含量较高时影响钢带焊接性能,合金含量高增加吨钢成本;轧钢2022年8月第39卷第4期文献“高强度热镀锌结构钢SGC570带钢的研发与应用”中报道结构钢SGC570成分设计中C(0.15~0.20%)、Mn(1.1~1.4%)、Al(0.03~0.06%),退火均热温度设定在600~620℃,与本发明成分、工艺设计不同;河北冶金2015年12月第12期文献“高强度热镀锌板S550GD+Z的研制与开发”中报道结构钢S550GD+Z成分设计中C:0.20%、S i:0.60%、Mn:1.70%)、与本发明成分设计不同,C、Mn含量较高时影响钢带焊接性能,S i高影响镀锌表面质量。
发明内容
本发明的目的是提供一种高强结构钢SGC570的生产方法,本发明产品具有高强度、高硬度、耐腐蚀等特点,生产成本低,易与普通钢材衔接,满足建筑用钢选材的需要。力学性能:屈服强度ReL≥560MPa,抗拉强度Rm≥570MPa。
为解决上述技术问题,本发明采用如下技术方案:
本发明一种高强结构钢SGC570的生产方法,包括:
(1)冶炼—连铸生产工艺流程:铁水预处理—转炉—LF精炼—板坯连铸;其中:
转炉顶底复吹冶炼中进行吹氧脱碳升温,转炉出钢过程加入铝铁、锰铁等进行脱氧合金化,控制P、S成分,防止钢液过氧化,出钢温度≥1620℃;LF炉外精炼采用LF全程吹氩工艺,根据钢水成分调整到目标成分,供铸机钢水成分为C:0.03~0.07%,S i≤0.05%,Mn:0.15~0.40%,P≤0.020%,S≤0.015%,Alt:0.015~0.040%,Ca:0.0010~0.0025%;上述板坯连铸过热度20~40℃,拉速控制在1.0~1.8m/mi n;
(2)热轧生产工艺流程:铸坯加热—粗轧—精轧—卷取;所述铸坯出炉温度1170~1260℃,粗轧采用3+3模式2机架轧机粗轧,精轧采用7机架轧机精轧,精轧开轧温度980~1030℃,精轧终轧温度为850~900℃,热轧钢带厚度2.7~5.5mm;冷却采用层流冷却设备,卷取温度为620~670℃;
(3)酸洗冷轧工艺流程:将热轧钢带经酸洗去除表面氧化铁皮后,经过5机架冷轧机冷轧,冷轧压下率为55~80%,厚度0.5~2.0mm;
(4)连续热镀锌、光整工艺流程:将冷硬钢带开卷后焊接连续生产,炉区速度≥60m/mi n,均热温度530~580℃,缓冷至490~530℃,然后冷却至450~475℃,入锌锅温度450~470℃,光整机延伸率0.2~0.5%。
进一步的,热轧厚度5.0mm。
进一步的,冷轧厚度1.5mm。
进一步的,所生产的高强结构钢SGC570的性能为:屈服强度ReL≥560MPa,抗拉强度Rm≥570MPa。
进一步的,所生产的高强结构钢SGC570的性能为:屈服强度ReL:575~593MPa,抗拉强度Rm:644~656MPa,延伸率A50:9.0~12.5%。
与现有技术相比,本发明的有益技术效果:
该产品具有高强度、高硬度、耐腐蚀等特点,生产成本低,易与普通钢材衔接,满足建筑用钢选材的需要。
力学性能:屈服强度ReL≥560MPa,抗拉强度Rm≥570MPa。
附图说明
下面结合附图说明对本发明作进一步说明。
图1为本发明实施例的显微组织图。
具体实施方式
以下通过具体实施例详细说明本发明的内容,实施例仅在于有助于理解本发明,而不限制本发明的内容。
实施例
按照以上炼钢生产工艺要求,实际板坯化学成分如表1所示。
表1本发明实施例的化学成分(wt%)
按照以上热轧工艺要求,热轧厚度5.0mm,实际工艺如表2所示。
表2本发明实施例的热轧工艺
按照以上冷轧、热镀锌、光整工艺要求,冷轧厚度1.5mm,实际热镀锌、光整工艺如表3所示。
表3本发明实施例的热镀锌、光整工艺
对本发明实施例的钢带进行力学性能检验,结果如表4所示。
表4本发明实施例的钢带力学性能
由表4数据可知,本发明一种高强结构钢SGC570力学性能:屈服强度ReL:575~593MPa,抗拉强度Rm:644~656MPa,延伸率A50:9.0~12.5%。综上所述工艺获得的钢带产品经用户使用,性能适宜,可推广使用。
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)
1.一种高强结构钢SGC570的生产方法,其特征在于:包括:
(1)冶炼—连铸生产工艺流程:铁水预处理—转炉—LF精炼—板坯连铸;其中:
转炉顶底复吹冶炼中进行吹氧脱碳升温,转炉出钢过程加入铝铁、锰铁等进行脱氧合金化,控制P、S成分,防止钢液过氧化,出钢温度≥1620℃;LF炉外精炼采用LF全程吹氩工艺,根据钢水成分调整到目标成分,供铸机钢水成分为C:0.03~0.07%,Si≤0.05%,Mn:0.15~0.40%,P≤0.020%,S≤0.015%,Alt:0.015~0.040%,Ca:0.0010~0.0025%;上述板坯连铸过热度20~40℃,拉速控制在1.0~1.8m/min;
(2)热轧生产工艺流程:铸坯加热—粗轧—精轧—卷取;所述铸坯出炉温度1170~1260℃,粗轧采用3+3模式2机架轧机粗轧,精轧采用7机架轧机精轧,精轧开轧温度980~1030℃,精轧终轧温度为850~900℃,热轧钢带厚度2.7~5.5mm;冷却采用层流冷却设备,卷取温度为620~670℃;
(3)酸洗冷轧工艺流程:将热轧钢带经酸洗去除表面氧化铁皮后,经过5机架冷轧机冷轧,冷轧压下率为55~80%,厚度0.5~2.0mm;
(4)连续热镀锌、光整工艺流程:将冷硬钢带开卷后焊接连续生产,炉区速度≥60m/min,均热温度530~580℃,缓冷至490~530℃,然后冷却至450~475℃,入锌锅温度450~470℃,光整机延伸率0.2~0.5%。
2.根据权利要求1所述的高强结构钢SGC570的生产方法,其特征在于:热轧厚度5.0mm。
3.根据权利要求2所述的高强结构钢SGC570的生产方法,其特征在于:冷轧厚度1.5mm。
4.根据权利要求1所述的高强结构钢SGC570的生产方法,其特征在于:所生产的高强结构钢SGC570的性能为:屈服强度ReL≥560MPa,抗拉强度Rm≥570MPa。
5.根据权利要求4所述的高强结构钢SGC570的生产方法,其特征在于:所生产的高强结构钢SGC570的性能为:屈服强度ReL:575~593MPa,抗拉强度Rm:644~656MPa,延伸率A50:9.0~12.5%。
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