CN114855086A - 一种2100MPa桥梁缆索用钢盘条的生产方法 - Google Patents
一种2100MPa桥梁缆索用钢盘条的生产方法 Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 56
- 239000010959 steel Substances 0.000 title claims abstract description 56
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 11
- 238000001816 cooling Methods 0.000 claims abstract description 39
- 238000010438 heat treatment Methods 0.000 claims abstract description 18
- 239000003595 mist Substances 0.000 claims abstract description 17
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 17
- 239000012535 impurity Substances 0.000 claims abstract description 11
- 238000009749 continuous casting Methods 0.000 claims abstract description 10
- 238000003723 Smelting Methods 0.000 claims abstract description 9
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 7
- 239000000126 substance Substances 0.000 claims abstract description 4
- 239000002893 slag Substances 0.000 claims description 25
- 238000005266 casting Methods 0.000 claims description 22
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 20
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 15
- 238000000034 method Methods 0.000 claims description 14
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 10
- 229910052786 argon Inorganic materials 0.000 claims description 10
- 238000007664 blowing Methods 0.000 claims description 10
- 238000002791 soaking Methods 0.000 claims description 10
- 238000009987 spinning Methods 0.000 claims description 10
- 238000003756 stirring Methods 0.000 claims description 10
- 229910052757 nitrogen Inorganic materials 0.000 claims description 9
- 238000007599 discharging Methods 0.000 claims description 8
- 229910045601 alloy Inorganic materials 0.000 claims description 6
- 239000000956 alloy Substances 0.000 claims description 6
- 238000010583 slow cooling Methods 0.000 claims description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 5
- 229910052742 iron Inorganic materials 0.000 claims description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Substances N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 5
- 230000001590 oxidative effect Effects 0.000 claims description 5
- 229910052760 oxygen Inorganic materials 0.000 claims description 5
- 239000001301 oxygen Substances 0.000 claims description 5
- 238000010079 rubber tapping Methods 0.000 claims description 5
- 238000004513 sizing Methods 0.000 claims description 5
- 229910052698 phosphorus Inorganic materials 0.000 abstract description 5
- 229910052717 sulfur Inorganic materials 0.000 abstract description 5
- 238000005516 engineering process Methods 0.000 abstract description 3
- 238000007670 refining Methods 0.000 abstract description 2
- 239000002131 composite material Substances 0.000 abstract 1
- FBPFZTCFMRRESA-JGWLITMVSA-N D-glucitol Chemical compound OC[C@H](O)[C@@H](O)[C@H](O)[C@H](O)CO FBPFZTCFMRRESA-JGWLITMVSA-N 0.000 description 5
- 229910052748 manganese Inorganic materials 0.000 description 5
- 239000011572 manganese Substances 0.000 description 5
- 229910052710 silicon Inorganic materials 0.000 description 5
- 239000010936 titanium Substances 0.000 description 4
- 229910052719 titanium Inorganic materials 0.000 description 4
- 229910001335 Galvanized steel Inorganic materials 0.000 description 1
- 229910004534 SiMn Inorganic materials 0.000 description 1
- XSQMSOYAHMZLJC-UHFFFAOYSA-N [Cr].[Ti].[V] Chemical compound [Cr].[Ti].[V] XSQMSOYAHMZLJC-UHFFFAOYSA-N 0.000 description 1
- 239000008186 active pharmaceutical agent Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000008397 galvanized steel Substances 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 238000009849 vacuum degassing Methods 0.000 description 1
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Abstract
一种2100MPa桥梁缆索用钢盘条的生产方法,采用工艺路线为转炉冶炼—LF炉—VD炉—连铸—开坯—加热—轧制—冷却,钢的化学组成重量百分比为C=0.88%~0.92%,Si=1.00%~1.20%,Mn=0.70~0.90%,P≤0.015%,S≤0.015%,Al≤0.020%,Ti=0.02%~0.05%,Cr=0.35%~0.40%,V=0.03%~0.05%,N=0.0040~0.0060%,其余为Fe和不可避免的杂质。本发明的高碳、Cr‑V‑Ti多元微合金化成分设计体系,LF+VD复合精炼技术,严格控制P、S含量和钢水的纯净度,轧钢控冷采用在线水雾冷却技术,生产的∮14.0mm盘条抗拉强度达到1500MPa、断面收缩率28%以上,生产∮7.0mm桥梁缆索用钢丝抗拉强度2100~2200MPa以上,扭转10~18次。
Description
技术领域
本发明属于冶金技术领域,涉及一种2100MPa桥梁缆索用钢盘条的生产方法。
背景技术
21世纪以来,国际上众多大型桥梁均采用 1860 MPa 级以上的高强度缆索,其中中国2000年建成通车的沪通大桥,应用了2000 MPa 级全球最高等级镀锌钢丝。
随着基础设施的快速发展,桥梁业的发展迎来了新的机遇,对桥梁钢的性能也提出了更高的要求,建桥业提出要求超过2000 MPa 级强度的缆索用钢盘条。
发明内容
本发明旨在提供一种2100MPa桥梁缆索用钢盘条的生产方法,其代表钢种QS90SiMn,轧制规格为Ф15mm,热轧盘条抗拉强度1480±50MPa,断面收缩率28%~38%,Ф15mm热轧盘条生产∮7.0mm桥梁缆索用钢丝,抗拉强度达到2100~2200MPa,扭转10~18次。
发明的技术方案:
一种2100MPa桥梁缆索用钢盘条的生产方法,采用工艺路线为转炉冶炼—LF炉—VD炉—连铸—开坯—加热—轧制—冷却,钢的化学组成重量百分比为C=0.88%~0.92%,Si=1.00%~1.20%,Mn=0.70~0.90%,P≤0.015%,S≤0.015%,Al≤0.020%,Ti=0.02%~0.05%,Cr=0.35%~0.40%,V=0.03%~0.05%,N=0.0040~0.0060%,其余为Fe和不可避免的杂质;关键工艺步骤包括:
(1)转炉冶炼:选用铁水对残余元素要求As+Sn+Ni+Cu≤0.070%;终点控制C≥0.20%、P≤0.025%;转炉使用低氮碳粉调碳,出钢1/4时顺钢流加入脱氧剂、合金和渣料;挡渣出钢,严禁下渣;
(2)LF炉:钢水在LF炉通电时间≥25min,总吹氩时间≥55 min;精炼造白渣脱氧去夹杂,精炼渣碱度3.0~3.5;
(3)VD炉:抽真空目标67Pa以下,保真空时间≥15min,软吹时间≥25 min;钢水出站前20min不能调整氩气流量;中包钢水过热度:开浇炉≤25℃,连浇炉≤20℃;
(4)连铸:铸坯断面350mm×430mm;全程保护浇铸;结晶器电搅300A、2.5HZ,末端电搅400A、3HZ;轻压下2~7架总计18mm;铸坯入坑缓冷≥72h;
(5)开坯:开坯后断面150mm×150mm;开坯均热温度1180~1220℃,加热时间240~360min,开坯后入坑缓冷≥24h;
(6)加热:铸坯均热温度1160~1200℃,加热时间100~150min,炉内氧化性气氛,残氧量≥6%;
(7)轧制:轧制成品规格∮15.0mm;开轧温度1050~1100℃,减定径前温度850~880℃,吐丝温度750~780℃;
(8)冷却:吐丝后散卷风冷,冷却方式为风冷+水雾冷却,水雾冷却进罩温度660~630℃,出罩温度520~500℃。
发明原理:本发明2100Mpa的∮7.0mm桥梁缆索用钢丝,采用Ф15mm的热轧盘条生产,其原始抗拉强度须达到1400Mpa以上,断面收缩率28%以上,以及95%的索氏体化率才能满足其抗拉强度和扭转性能的要求。本发明通过采用高碳高硅高锰以及铬钒钛微合金成分设计,LF精炼,VD炉真空脱气、开坯、轧后水雾快冷等一系列冶炼和轧制技术,成功开发了95%以上索氏体化率组织,具有高强度的良好的综合力学性能的,能够很好的满足2100MPa的∮7.0mm桥梁缆索用钢盘条,其代表钢种QS90SiMn。
本发明的有益效果:在保证产品质量的同时,降低合金含量和生产成本,为高强度线材的开发提供了一种新的思路,推进了中国节约环保型钢材新品种的研发进程;利用钢厂现有设备和工艺条件,既不增加投资和生产成本,又提高了生产效率,节能减耗。
附图说明
图1为实施例1代表钢种QS90SiMn热轧金相组织图,500X 索氏体95%。
图2 为实施例2的代表钢种QS90SiMn热轧金相组织图,500X 索氏体98%。
图3 为实施例1代表钢种QS90SiMn夹杂物图,100X B0.5 D1 DS0.5。
图4 为实施例2代表钢种QS90SiMn夹杂物图,100X B1 D1 D0.5e。
具体实施方式
下面结合实施例对本发明的内容作进一步说明:
实施例1:
一种2100MPa桥梁缆索用钢盘条的生产,钢的化学组成重量百分比为C=0.88%,Si=1.00%,Mn=0.77%,P=0.015%,S=0.012%,Al=0.010%,Ti=0.02%,Cr=0.38%,V=0.032%,N=0.0046%,其余为Fe和不可避免的杂质;关键工艺步骤包括:
(1)转炉冶炼:选用优质铁水,残余元素要求As+Sn+Ni+Cu≤0.070%;终点控制目标值:C≥0.20%、P≤0.025%;转炉使用低氮碳粉调碳;出钢1/4时顺钢流加入脱氧剂、合金和渣料;挡渣出钢,严禁下渣;
(2)LF炉:钢水在LF炉通电时间35min,总吹氩时间60 min;精炼造白渣脱氧去夹杂, 精炼渣碱度3.0;
(3)VD炉:抽真空目标67Pa以下,保真空时间18min,软吹时间25 min;钢水出站前20min不调整氩气流量;中包钢水过热度:18℃;
(4)连铸:铸坯断面350mm×430mm;全程保护浇铸;结晶器电搅300A、2.5HZ,末端电搅400A、3HZ;轻压下2~7架总计18mm;铸坯入坑缓冷72h;
(5)开坯:开坯后断面150mm×150mm;开坯均热温度1180~1220℃,加热时间320min;开坯后入坑缓冷24h;
(6)加热:铸坯均热温度1160~1200℃,加热时间110min,炉内氧化性气氛,残氧量6%;
(7)轧制:轧制成品规格∮15.0mm;开轧温度1050~1100℃,减定径前温度850~880℃,吐丝温度750~760℃;
(8)冷却:吐丝后散卷风冷辊道长度120m,冷却方式为风冷+水雾冷却,水雾冷却进罩温度650℃,出罩温度510℃。
实施例2:
一种2100MPa桥梁缆索用钢盘条。钢的组成重量百分比为:C=0.92%,Si=1.20%,Mn=0.87%,P=0.012%,S=0.012%,Al=0.008%,Ti=0.04%,Cr=0.40%,V=0.045%,N=0.0056%,其余为Fe和不可避免的杂质;关键工艺步骤包括:
(1)转炉冶炼:选用优质铁水,残余元素要求As+Sn+Ni+Cu≤0.070%;终点控制目标值:C≥0.20%、P≤0.025%;转炉使用低氮碳粉调碳;出钢1/4时顺钢流加入脱氧剂、合金和渣料;挡渣出钢,严禁下渣;
(2)LF炉:钢水在LF炉通电时间35min,总吹氩时间60 min;精炼造白渣脱氧去夹杂, 精炼渣碱度3.1;
(3)VD炉:抽真空目标67Pa以下,保真空时间20min,软吹时间29 min;钢水出站前20min不调整氩气流量;中包钢水过热度: 20℃;
(4)连铸:铸坯断面350mm×430mm;全程保护浇铸;结晶器电搅300A、2.5HZ,末端电搅400A、3HZ;轻压下2~7架总计18mm;铸坯入坑缓冷80h;
(5)开坯:开坯后断面150mm×150mm;开坯均热温度1180~1220℃,加热时间330min;开坯后入坑缓冷26h;
(6)加热:铸坯均热温度1160~1200℃,加热时间115min,炉内氧化性气氛,残氧量6.5%;
(7)轧制:轧制成品规格∮15.0mm;开轧温度1050~1080℃,减定径前温度860~880℃,吐丝温度750~760℃;
(8)冷却:吐丝后散卷风冷辊道长度120m,冷却方式为风冷+水雾冷却,水雾冷却进罩温度640℃,出罩温度512℃。
实施例3:
一种2100MPa桥梁缆索用钢盘条。钢的组成重量百分比为:C=0.90%,Si=1.10%,Mn=0.75%,P=0.010%,S=0.008%,Al=0.015%,Ti=0.04%,Cr=0.36%,V= 0.042%,N=0.0050%,其余为Fe和不可避免的杂质;关键工艺步骤包括:
(1)转炉冶炼:选用优质铁水,残余元素要求:As+Sn+Ni+Cu≤0.070%;终点控制目标值:C≥0.20%、P≤0.025%;转炉使用低氮碳粉调碳;出钢1/4时顺钢流加入脱氧剂、合金和渣料;挡渣出钢,严禁下渣;
(2)LF炉:钢水在LF炉通电时间40min,总吹氩时间65 min;精炼造白渣脱氧去夹杂, 精炼渣碱度3.5;
(3)VD炉:抽真空目标67Pa以下,保真空时间22min,软吹时间32 min;钢水出站前20min不调整氩气流量;中包钢水过热度 20℃;
(4)连铸:铸坯断面350mm×430mm;全程保护浇铸;结晶器电搅300A、2.5HZ,末端电搅400A、3HZ;轻压下2~7架总计18mm;铸坯入坑缓冷75h;
(5)开坯:开坯后断面150mm×150mm;开坯均热温度1180~1220℃,加热时间312min;开坯后入坑缓冷25h;
(6)加热:铸坯均热温度1160~1200℃,加热时间108min,炉内氧化性气氛,残氧量6%;
(7)轧制:轧制成品规格∮15.0mm;开轧温度1050~1070℃,减定径前温度850~870℃,吐丝温度750~765℃;
(8)冷却:吐丝后散卷风冷辊道长度120m,冷却方式为风冷+水雾冷却,水雾冷却进罩温度630℃,出罩温度502℃。
盘条力学性能、索氏体化率、夹杂物见表1所示。
表1 实施例中盘条的力学性能、索氏体化率、夹杂物
从表1测试结果可见,采用本发明的方法生产的一种2100MPa桥梁缆索用钢盘条,规格∮15.0mm,抗拉强度1430~1530 Mpa,延伸12~14%,面缩29~38%;索氏体化率95~99%,夹杂物B1.5 D1 D0.5e。该盘条生产∮7.0mm桥梁缆索用钢丝,抗拉强度2100~2200MPa,扭转10~18次,,能够很好的满足2100MPa桥梁缆索用钢的使用要求。
Claims (1)
1.一种2100MPa桥梁缆索用钢盘条的生产方法,采用工艺路线为转炉冶炼—LF炉—VD炉—连铸—开坯—加热—轧制—冷却,钢的化学组成重量百分比为C=0.88%~0.92%,Si=1.00%~1.20%,Mn=0.70~0.90%,P≤0.015%,S≤0.015%,Al≤0.020%,Ti=0.02%~0.05%,Cr=0.35%~0.40%,V=0.03%~0.05%,N=0.0040~0.0060%,其余为Fe和不可避免的杂质;关键工艺步骤包括:
(1)转炉冶炼:选用铁水对残余元素要求As+Sn+Ni+Cu≤0.070%;终点控制C≥0.20%、P≤0.025%;转炉使用低氮碳粉调碳,出钢1/4时顺钢流加入脱氧剂、合金和渣料;挡渣出钢,严禁下渣;
(2)LF炉:钢水在LF炉通电时间≥25min,总吹氩时间≥55 min;精炼造白渣脱氧去夹杂,精炼渣碱度3.0~3.5;
(3)VD炉:抽真空目标67Pa以下,保真空时间≥15min,软吹时间≥25 min;钢水出站前20min不能调整氩气流量;中包钢水过热度:开浇炉≤25℃,连浇炉≤20℃;
(4)连铸:铸坯断面350mm×430mm;全程保护浇铸;结晶器电搅300A、2.5HZ,末端电搅400A、3HZ;轻压下2~7架总计18mm;铸坯入坑缓冷≥72h;
(5)开坯:开坯后断面150mm×150mm;开坯均热温度1180~1220℃,加热时间240~360min;开坯后入坑缓冷≥24h;
(6)加热:铸坯均热温度1160~1200℃,加热时间100~150min,炉内氧化性气氛,残氧量≥6%;
(7)轧制:轧制成品规格∮15.0mm;开轧温度1050~1100℃,减定径前温度850~880℃,吐丝温度750~780℃;
(8)冷却:吐丝后散卷风冷,冷却方式为风冷+水雾冷却,水雾冷却进罩温度660~630℃,出罩温度520~500℃。
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