CN114892079A - 一种低碳贝氏体非调质热轧圆钢的生产方法 - Google Patents
一种低碳贝氏体非调质热轧圆钢的生产方法 Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 38
- 239000010959 steel Substances 0.000 title claims abstract description 38
- 229910001563 bainite Inorganic materials 0.000 title claims abstract description 21
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 18
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 17
- 238000005096 rolling process Methods 0.000 claims abstract description 20
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 16
- 238000010438 heat treatment Methods 0.000 claims abstract description 15
- 238000001816 cooling Methods 0.000 claims abstract description 14
- 238000000034 method Methods 0.000 claims abstract description 13
- 238000009749 continuous casting Methods 0.000 claims abstract description 8
- 230000008569 process Effects 0.000 claims abstract description 7
- 238000003723 Smelting Methods 0.000 claims abstract description 6
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 24
- 238000005266 casting Methods 0.000 claims description 13
- 239000002893 slag Substances 0.000 claims description 13
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 10
- 238000003756 stirring Methods 0.000 claims description 10
- 238000007670 refining Methods 0.000 claims description 7
- 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
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- 238000007664 blowing Methods 0.000 claims description 5
- 239000003607 modifier Substances 0.000 claims description 5
- 239000002245 particle Substances 0.000 claims description 5
- 230000002378 acidificating effect Effects 0.000 claims description 2
- 238000006477 desulfuration reaction Methods 0.000 claims description 2
- 230000023556 desulfurization Effects 0.000 claims description 2
- 238000009792 diffusion process Methods 0.000 claims description 2
- 238000002791 soaking Methods 0.000 claims description 2
- 230000001502 supplementing effect Effects 0.000 claims description 2
- 229910052748 manganese Inorganic materials 0.000 abstract description 8
- 238000005520 cutting process Methods 0.000 abstract description 7
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- 239000011572 manganese Substances 0.000 description 8
- 238000004321 preservation Methods 0.000 description 6
- 239000002253 acid Substances 0.000 description 3
- SKKMWRVAJNPLFY-UHFFFAOYSA-N azanylidynevanadium Chemical compound [V]#N SKKMWRVAJNPLFY-UHFFFAOYSA-N 0.000 description 3
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- 238000005516 engineering process Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
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- 230000009286 beneficial effect Effects 0.000 description 2
- 239000002436 steel type Substances 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- 238000009849 vacuum degassing Methods 0.000 description 2
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- 229910001566 austenite Inorganic materials 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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Abstract
一种低碳贝氏体非调质热轧圆钢的生产方法,采用工艺路线为转炉冶炼—LF炉—RH炉—连铸—加热—轧制—冷却。钢的组成重量百分比为:C=0.20%~0.30%,Si=0.20%~0.40%,Mn=1.50~2.20%,P≤0.025%,S=0.030%~0.080%,Al=0.010%~0.050%,Ni=0.04%~0.10%,Cr=0.30%~0.60%,V=0.10%‑0.20%,N=0.005%~0.010%,其余为Fe和不可避免的杂质。本发明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。本发明的产品组织为贝氏体组织,具有高强度、高硬性、高塑韧性、良好的切削性能、冲击性能,能够很好的满足汽车前轴使用需求。
Description
技术领域
本发明属于冶金技术领域,涉及一种低碳贝氏体非调质热轧圆钢FAS22225的生产方法。
背景技术
汽车前轴为汽车前桥最重要的安全构件之一,在工作中需承受弯曲载荷和交变载荷等应力,工作环境恶劣、载重量大,要求材料具备较高的强度、塑硬性、冲击性能、较高的疲劳寿命。传统的汽车前轴采用调质钢工艺生产、热处理变形量大、综合性能不稳定、碳排放高。FAS22225用低碳贝氏体非调质钢作为应用汽车前轴新型材料,取代调质钢节约生产成本并避免热处理带来的变形、开裂影响,具备优良的力学性能,前轴制造、加工过程更加绿色环保节能降耗。
发明内容
本发明旨在提供一种低碳贝氏体非调质热轧圆钢的生产方法,其代表钢种FAS22225,最大规格为150mm,最小规格为90mm,热轧抗拉强度在900~1050MPa,屈服强度在650~800MPa,延伸率在10~20以上,常温冲击AKV在34J以上,具有良好的高强度、高硬性、良好的切削性能、冲击性能等,能够很好的满足汽车前轴用钢材的使用需求。
发明的技术方案:
一种低碳贝氏体非调质热轧圆钢的生产方法,采用工艺路线为转炉冶炼—LF炉—RH炉—连铸—加热—轧制—冷却,钢的化学组成重量百分比为C=0.20%~0.30%,Si=0.20%~0.40%,Mn=1.50~2.20%,P≤0.025%,S=0.030%~0.080%,Al=0.010%~0.050%,Ni=0.04%~0.10%,Cr= 0.30%~0.60%,V=0.10%-0.20%,N =0.005%~0.010%,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:终点控制目标值C≥0.05%、P≤0.020%。
(2)LF炉:使用Al粒进行扩散脱氧,快速造渣脱氧、脱硫,快速成渣,精炼中后期采用酸性调渣剂调整终渣碱度4.0±1.0;脱氧到S≤0.005%、温度≥1580℃后使用VN合金增氮+出站前补喂N线控氮;喂Ca线70~100m,间隔5min后喂S线增S。
(3)RH炉:真空环流氮气,保持时间≥8min、软吹氩时间≥15min。
(4)连铸:拉速0.52~0.60m/min,结晶器电磁搅拌强度电流100~300A、频率2.0~5.0HZ,末端电磁搅拌强度200~500A、频率5~10HZ;铸坯凝固末端多点重压下10~25mm。
(5)轧制铸坯加热:预热段温度≤650℃,均热温度1190±20℃,加热时间350±50min。
(6)轧制:开轧温度1120±30℃。
(7)轧后冷却:圆钢入坑缓冷,入坑温度300~500℃。
发明原理:
本发明通过低碳高锰、钒氮复合强化、适当提高S含量、LF精炼技术RH炉真空脱气轧后缓冷等一系列冶炼和轧制新技术,成功开发贝氏体组织的汽车前轴用热轧圆钢,具有高强度、高硬性、高塑韧性、良好的切削性能、冲击性能等,能够很好的满足汽车前轴使用需求,其代表钢种其代表钢种FAS22225。
本发明化学成分设计对其强度和延伸性能、塑硬性、冲击性能、切削比性能等重点考虑,组织设计则是贝氏体组织。
采用低碳高锰钒氮成分设计。C含量的降低能够显著提高塑性、韧性,改善冲击性能,因此最终碳含量控制在0.20~0.30%;锰是弱碳化物形成元素,它可以降低奥氏体转变温度,形成贝氏体组织,对提高强度和韧性有益和改善冲击性能有益,因此采用锰设计1.50~2.20%。采用V-N微合金复合强化能显著提高强度性能、改善冲击性能,形成贝氏体组织,V设计0.10%-0.20%,N设计0.005%~0.010%。Cr是碳化物主要形成元素,能够有效提高强度,形成贝氏体组织,含量过高降低塑性、韧性,Cr含量设计0.30%~0.60%。为了改善切削性能,适当设计合理的S含量0.030%~0.080%。
本发明的有益效果:低碳高锰、钒氮复合强化、LF精炼技术RH炉真空脱气,适当提高S含量和钢水的纯净度,成功开发贝氏体组织的汽车前轴用热轧圆钢FAS22225的生产方法;可利用钢厂一般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;产品组织为贝氏体组织,高强度、高硬性、高塑韧性、良好的切削性能、冲击性能,能够很好的满足汽车前轴使用需求。
附图说明
图1 为本发明实施例的500X热轧态金相组织图。
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:
一种汽车前轴用低碳贝氏体非调质热轧圆钢的生产,钢的组成重量百分比为:C=0.24%,Si=0.35%,Mn=2.01%,P=0.012%,S=0.040%,Al=0.015%,Ni=0.05%,Cr =0.52%,V=0.114%,N=0.0085%,其余为Fe和不可避免的杂质;关键工艺步骤包括:
(1)转炉:终点C:0.07%,P :0.009%;出钢1/4时往钢包中加入合金。
(2)LF炉:Al粒60Kg+SiC120Kg扩散脱氧;15min成白渣,精炼中后期采用150Kg酸性调渣剂,终渣碱度5.2;S≤0.004%、温度1605℃后使用400KGVN合金增氮;喂Ca线100m,间隔5min后喂S线650m增S。
(3)RH炉: 真空环流氮气,保真空时间12min,破空后软吹氩时间18min。
(4)连铸:拉速0.55m/min ;结晶器电磁搅拌参数:强度150A、频率2.5HZ,末端电磁搅拌参数:强度300A、频率8HZ;铸坯凝固末端多点重压下12mm;铸坯尺寸:350 mm×430 mm×6m。
(5)加热:铸坯加热温度1182~1205℃之间,在炉时间370min。
(6)轧制:开轧温度1105℃。
(7)轧后冷却:轧后冷床保温罩冷却,温度到450℃入缓冷坑保温,保温时间27h。
圆钢力学性能见表1所示。
实施例2:
一种汽车前轴用低碳贝氏体非调质热轧圆钢的生产,钢的组成重量百分比为:C=0.23%,Si=0.38%,Mn=2.05%,P=0.013%,S=0.045%,Al=0.018%,Ni=0.06%,Cr =0.55%,V=0.117%,N=0.0080%,其余为Fe和不可避免的杂质;关键工艺步骤包括:
(1)转炉:终点C:0.06%,P :0.012%。
(2) LF炉:Al粒50Kg+SiC130Kg扩散脱氧;18min成白渣,精炼中后期采用140Kg酸性调渣剂,终渣碱度4.9;S≤0.003%、温度1600℃后使用380KGVN合金增氮;喂Ca线100m,间隔5min后喂S线660m增S。
(3) RH炉: 真空环流氮气;保真空时间10min,破空后软吹氩时间17min。
(4) 连铸:拉速0.55m/min;结晶器电磁搅拌参数:强度150A、频率2.5HZ,末端电磁搅拌参数:强度300A、频率8HZ;铸坯凝固末端多点重压下12mm;铸坯尺寸: 350 mm×430 mm×6m。
(5)加热:铸坯加热温度1187~1203℃之间,在炉时间358min。
(6) 轧制:开轧温度1095℃。
(7) 轧后冷却:轧后冷床保温罩冷却,温度到430℃入缓冷坑保温,保温时间26h。
圆钢力学性能见表1所示。
实例3:
一种汽车前轴用低碳贝氏体非调质热轧圆钢的生产,钢的化学组成重量百分比为:C=0.26%,Si=0.40%,Mn=2.08%,P=0.015%,S=0.052%,Al=0.021%,Ni=0.05%,Cr =0.54%,V=0.110%,N=0.0088%,其余为Fe和不可避免的杂质;关键工艺步骤包括:
(1)转炉:终点C:0.05%,P :0.014%。
(2)LF炉:Al粒60Kg+SiC140Kg扩散脱氧;14min成白渣,精炼中后期采用145Kg酸性调渣剂,终渣碱度5.3;S≤0.003%、温度158℃后使用370KGVN合金增氮;喂Ca线100m,间隔5min后喂S线640m增S。
(3)RH炉:真空环流氮气;保真空时间8min,破空后软吹氩时间20min。
(4)连铸:拉速0.60m/min ;结晶器电磁搅拌参数:强度150A、频率2.5HZ,末端电磁搅拌参数:强度300A、频率8HZ;铸坯凝固末端多点重压下12mm;铸坯尺寸:350 mm×430 mm×6m。
(5)加热:铸坯加热温度1182~1210℃之间,在炉时间348min。
(6)轧制:开轧温度1087℃。
(7)轧后冷却:轧后冷床保温罩冷却,温度到380℃入缓冷坑保温,保温时间30h。
圆钢力学性能见表1所示。
表1 实施例中圆钢的正火力学性能
从表1测试结果可见,采用本发明的方法生产的汽车前轴用低碳贝氏体非调质热轧圆钢,当规格为150mm、130mm、110mm时,正火后具有高强度、高硬性、良好的切削等性能,能够很好的满足汽车前轴使用需求。
Claims (1)
1. 一种低碳贝氏体非调质热轧圆钢的生产方法,采用工艺路线为转炉冶炼—LF炉—RH炉—连铸—加热—轧制—冷却,其特征在于:钢的化学组成重量百分比为C=0.20%~0.30%,Si=0.20%~0.40%,Mn=1.50~2.20%,P≤0.025%,S=0.030%~0.080%,Al=0.010%~0.050%,Ni=0.04%~0.10%,Cr= 0.30%~0.60%,V=0.10%-0.20%,N =0.005%~0.010%,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:终点控制目标值C≥0.05%、P≤0.020%;
(2)LF炉:使用Al粒进行扩散脱氧,快速造渣脱氧、脱硫,快速成渣,精炼中后期采用酸性调渣剂调整终渣碱度4.0±1.0;脱氧到S≤0.005%、温度≥1580℃后使用VN合金增氮+出站前补喂N线控氮;喂Ca线70~100m,间隔5min后喂S线增S;
(3)RH炉:真空环流氮气,保持时间≥8min、软吹氩时间≥15min;
(4)连铸:拉速0.52~0.60m/min,结晶器电磁搅拌强度100~300A、频率2.0~5.0HZ,末端电磁搅拌强度200~500A、频率5~10HZ;铸坯凝固末端多点重压下10~25mm;
(5)轧制铸坯加热:预热段温度≤650℃,均热温度1190±20℃,加热时间350±50min;
(6)轧制:开轧温度1120±30℃;
(7)轧后冷却:圆钢入坑缓冷,入坑温度300~500℃。
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