CN114908282B - 控制swrh42b碳素钢热轧盘条氧氮含量的生产工艺 - Google Patents
控制swrh42b碳素钢热轧盘条氧氮含量的生产工艺 Download PDFInfo
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 52
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 27
- 229910052760 oxygen Inorganic materials 0.000 title claims abstract description 27
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 title claims abstract description 26
- 239000001301 oxygen Substances 0.000 title claims abstract description 26
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 19
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- 229910052742 iron Inorganic materials 0.000 claims abstract description 13
- 238000009749 continuous casting Methods 0.000 claims abstract description 12
- 238000007670 refining Methods 0.000 claims abstract description 12
- 238000005266 casting Methods 0.000 claims abstract description 10
- 239000002893 slag Substances 0.000 claims abstract description 9
- 238000003723 Smelting Methods 0.000 claims abstract description 8
- 238000010438 heat treatment Methods 0.000 claims abstract description 6
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 claims abstract description 4
- 239000010436 fluorite Substances 0.000 claims abstract description 4
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 34
- 229910052786 argon Inorganic materials 0.000 claims description 17
- 238000007664 blowing Methods 0.000 claims description 17
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 9
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- 229910052799 carbon Inorganic materials 0.000 claims description 7
- 238000010079 rubber tapping Methods 0.000 claims description 7
- 238000009628 steelmaking Methods 0.000 claims description 7
- 229910000519 Ferrosilicon Inorganic materials 0.000 claims description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 5
- 238000006477 desulfuration reaction Methods 0.000 claims description 5
- 230000023556 desulfurization Effects 0.000 claims description 5
- 238000005275 alloying Methods 0.000 claims description 4
- PYLLWONICXJARP-UHFFFAOYSA-N manganese silicon Chemical compound [Si].[Mn] PYLLWONICXJARP-UHFFFAOYSA-N 0.000 claims description 4
- 229910052717 sulfur Inorganic materials 0.000 claims description 4
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 3
- 235000007164 Oryza sativa Nutrition 0.000 claims description 3
- 239000010459 dolomite Substances 0.000 claims description 3
- 229910000514 dolomite Inorganic materials 0.000 claims description 3
- 239000010903 husk Substances 0.000 claims description 3
- 229910052698 phosphorus Inorganic materials 0.000 claims description 3
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- 235000009566 rice Nutrition 0.000 claims description 3
- 229910052710 silicon Inorganic materials 0.000 claims description 3
- 238000004140 cleaning Methods 0.000 claims description 2
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- 229910052748 manganese Inorganic materials 0.000 claims description 2
- 239000011572 manganese Substances 0.000 claims description 2
- 239000000463 material Substances 0.000 claims description 2
- 240000007594 Oryza sativa Species 0.000 claims 1
- 230000001681 protective effect Effects 0.000 abstract description 4
- 229910052782 aluminium Inorganic materials 0.000 abstract description 3
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- 241000209094 Oryza Species 0.000 description 2
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- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 229910001335 Galvanized steel Inorganic materials 0.000 description 1
- 229910000639 Spring steel Inorganic materials 0.000 description 1
- 229910000746 Structural steel Inorganic materials 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
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- 239000010936 titanium Substances 0.000 description 1
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- C21—METALLURGY OF IRON
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Abstract
本发明涉及一种控制SWRH42B碳素钢热轧盘条氧氮含量的生产工艺,采用铁水预处理、转炉冶炼、LF精炼、方坯连铸的生产工艺流程,通过控制入炉铁水S含量,转炉终点控制,低铝精炼预熔渣和萤石进行渣洗,扩散脱氧,缩短LF通电时间及埋弧加热、连铸全程保护浇铸等一系列措施,进行全流程把控,降低钢水中的氧、氮含量,钢水中O≤40ppm、N≤50ppm。本发明在不增加新工序与设备的条件下,解决了现有生产工艺氧、氮含量控制不稳易超标等技术难题。
Description
技术领域
本发明涉及炼钢技术领域,特别涉及一种控制SWRH42B碳素钢热轧盘条氧氮含量的生产工艺。
背景技术
SWRH42B碳素钢热轧盘条主要用于制造高强度结构钢丝、弹簧钢丝、制绳钢丝、镀锌钢丝、胶管钢丝等产品,盘条需进行多道次拉拔加工后才能被下游用户使用,而过高的氧、氮含量会对盘条的机械性能和使用寿命产生不利影响,降低产品使用价值和经济价值。
钢中氧含量较高时,意味着钢中的非金属夹杂物多,表现为与钢中的铝、硅等元素结合形成氧化物夹杂,使钢的强度、塑性全面下降,严重恶化钢的韧性和疲劳性能。在轧后冷却的过程中,由于夹杂物和基体的收缩程度存在差异,产生形变应力场,导致出现局部裂纹。氮在钢中是一种有害元素,氮不仅会增加盘条的时效性、降低焊接性能,而且会导致“蓝脆”发生。此外,过多的氮还会与钢液中铝、钛等元素结合,生成带有一定棱角的脆性夹杂物,在盘条进行拉拔时,其内部会出现微小的空洞,并聚合长大,使材料的韧性、塑性下降,最终导致拉拔断裂,增加断丝率,因此控制钢中的氧氮含量具有重要意义。
目前大多数专利都是对氧、氮进行单独控制,同时控制钢中氧、氮含量的方法还很少,此外,这些专利主要集中在转炉冶炼过程中控氧、控氮工艺,很少有全流程考虑,若仅从某一生产环节进行控制,易导致钢水中气体含量增加,因此,需要发明一种对每个生产环节氧、氮含量进行有效控制的生产工艺,来降低优质碳素钢热轧盘条的氧、氮含量,提高产品拉拔性能。
发明内容
本发明的目的在于提供一种控制SWRH42B碳素钢热轧盘条氧氮含量的生产工艺,为使钢水中O≤40ppm、N≤50ppm,本发明从铁水预处理、炼钢、精炼、连铸全流程提出了SWRH42B 碳素钢热轧盘条控氧控氮技术,来降低钢水中的氧、氮含量,提高产品使用性能和市场价值。
为实现上述目的,本发明采用以下技术方案实现:
控制SWRH42B碳素钢热轧盘条氧氮含量的生产工艺,包括如下工艺步骤:
1)铁水预处理工序:向铁水包中喷吹钝化镁粉和石灰粉脱硫,处理后要求铁水S≤0.022wt%;
2)转炉炼钢工序:使用顶底复吹转炉进行冶炼,复吹供氩气,转炉终点碳含量0.26wt%~0.35wt%,出钢温度1620℃~1650℃,保证终点碳含量和温度一次命中,钢包预吹氩2~3min,出钢时间控制在5~6min,加入28~31kg/t白灰、13.5~15.5kg/t白云石和13.5~14.5kg澳矿造渣,合金化选用7.5~8.5kg/t硅锰和0.9~1.2kg/t硅铁进行合金化,加入1.5~3.0kg/t炼钢增碳剂,氩站吹氩时间控制在7~8min;
3)LF精炼工序:炉内保持微正压40~70kPa,采用埋弧加热,弧光不外漏,加入6.5~ 8.5kg/t石灰、0.6~0.8kg/t萤石、60kg~80kg/炉电渣石造白渣精炼,并加入0.5~0.7kg/t 碳化稻壳,0.8~1.7kg/t锰硅和0.8~1.5kg/t硅铁;静吹氩时间大于15min,LF炉离站温度1540℃~1560℃;
4)连铸工序:控制钢水过热度在15~30℃。
控制钢中成分:C 0.40wt%~0.44wt%,Si 0.18wt%~0.25wt%,Mn 0.60wt%~0.65wt%, P≤0.018wt%,S≤0.015wt%。
连铸工序采取全程保护浇铸工艺,并且浇铸开始前用氩气清洗中间包。
钢中O≤0.0040wt%,N≤0.0050wt%。
与现有技术相比,本发明的有益效果是:
1)本发明采用铁水预处理、转炉冶炼、LF精炼、方坯连铸的生产工艺流程,通过控制入炉铁水S含量,转炉终点控制,缩短LF通电时间及埋弧加热、连铸全程保护浇铸等一系列措施,进行全流程把控,降低钢水中的氧、氮含量,提升钢材使用性能。
2)本发明在不增加新工序与设备的条件下,解决了现有生产工艺氧、氮含量控制不稳易超标等技术难题。
具体实施方式
下面对本发明的实施方式进一步说明:
控制SWRH42B碳素钢热轧盘条氧氮含量的生产工艺,本发明从转炉冶炼工艺、LF温度控制及埋弧精炼和连铸保护浇铸等生产流程进行合理化控制,使钢水中O≤0.0040%。N≤ 0.0050%。本发明的工艺过程为:铁水预处理→转炉→精炼LF→连铸,其中内控成分C0.40wt%~0.44wt%,Si 0.18wt%~0.25wt%,Mn 0.60wt%~0.65wt%,P≤0.018wt%,S≤ 0.015wt%。具体包括如下工艺步骤:
1)铁水预处理工序:向铁水包中喷吹钝化镁粉和石灰粉脱硫,并将包内的脱硫渣捞净,做到铁水表面无渣层,处理后要求铁水S≤0.022wt%,保证终点硫含量满足要求,减小LF脱硫压力。
2)转炉炼钢工序:使用顶底复吹转炉进行冶炼,复吹全程供氩气,冶炼接近终点时,适当降低枪位,加强熔池搅动,转炉终点碳含量0.26wt%~0.35wt%,减少吹炼时间,降低钢中氧含量。转炉出钢温度1620℃~1650℃,保证终点碳含量和温度一次命中,钢包及合金烘烤充分,钢包预吹氩2~3min,挡渣出钢,杜绝下渣,出钢过程保持圆流出钢,禁止钢液散流,出钢时间控制在5~6min。每炉加入28~31kg/t白灰、13.5~15.5kg/t白云石和13.5~14.5kg/t澳矿造渣,合金化选用7.5~8.5kg/t硅锰和0.9~1.2kg/t硅铁进行合金化,加入1.5~3.0kg/t炼钢增碳剂。氩站吹氩时间控制在7~8min,防止钢水裸露。
3)LF精炼工序:保证LF炉盖与钢包接触紧密,炉内保持微正压40~70kPa,采用埋弧加热,弧光不外漏,缩短电极加热时间。加入6.5~8.5kg/t石灰、0.6~0.8kg/t萤石、60kg~80kg/炉电渣石造白渣精炼,并加入0.5~0.7kg/t碳化稻壳,0.8~1.7kg/t锰硅和0.8~1.5kg/t硅铁。静吹氩时间大于15min,LF炉离站温度1540℃~1560℃。
4)连铸工序:采用低过热度浇铸,控制钢水过热度在15~30℃,采取全程保护浇铸工艺,并且浇铸开始前用氩气清洗中间包。
经上述步骤后,成品SWRH42B化学成分如下表:
Claims (3)
1.控制SWRH42B碳素钢热轧盘条氧氮含量的生产工艺,其特征在于,包括如下工艺步骤:
1)铁水预处理工序:向铁水包中喷吹钝化镁粉和石灰粉脱硫,处理后要求铁水S≤0.022wt%;
2)转炉炼钢工序:使用顶底复吹转炉进行冶炼,复吹供氩气,转炉终点碳含量0.26wt%~0.35wt%,转炉出钢温度1620℃~1650℃,出钢时间控制在5~6min,加入28~31kg/t白灰、13.5~15.5kg/t白云石和13.5~14.5kg/t澳矿造渣,合金化选用7.5~8.5kg/t锰硅和0.9~1.2kg/t硅铁进行合金化,加入1.5~3.0kg/t炼钢增碳剂,氩站吹氩时间控制在7~8min;
3)LF精炼工序:炉内保持微正压40~70kPa,采用埋弧加热,弧光不外漏,辅料加入6.5~8.5kg/t石灰、0.6~0.8kg/t萤石、60kg~80kg/炉电渣石造白渣精炼,并加入0.5~0.7kg/t碳化稻壳,0.8~1.7kg/t锰硅和0.8~1.5kg/t硅铁,静吹氩时间大于15min,LF炉离站温度1540℃~1560℃;
4)连铸工序:控制钢水过热度在15~30℃;
钢中O≤0.0040wt%,N≤0.0050wt%。
2.根据权利要求1所述的控制SWRH42B碳素钢热轧盘条氧氮含量的生产工艺,其特征在于,控制钢中成分:C 0.40wt%~0.44wt%,Si 0.18wt%~0.25wt%,Mn 0.60wt%~0.65wt%,P≤0.018wt%,S≤0.015wt%。
3.根据权利要求1所述的控制SWRH42B碳素钢热轧盘条氧氮含量的生产工艺,其特征在于,连铸工序采取全程保护浇铸工艺,并且浇铸开始前用氩气清洗中间包。
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