CN115011877A - 一种含硫汽车曲轴用非调质钢及其生产工艺 - Google Patents
一种含硫汽车曲轴用非调质钢及其生产工艺 Download PDFInfo
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- CN115011877A CN115011877A CN202210654505.4A CN202210654505A CN115011877A CN 115011877 A CN115011877 A CN 115011877A CN 202210654505 A CN202210654505 A CN 202210654505A CN 115011877 A CN115011877 A CN 115011877A
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- tempered steel
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 74
- 239000010959 steel Substances 0.000 title claims abstract description 74
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- B21B1/46—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting
- B21B1/463—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting in a continuous process, i.e. the cast not being cut before rolling
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- C21C5/52—Manufacture of steel in electric furnaces
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- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
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- C21D9/0081—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for slabs; for billets
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Abstract
本发明涉及一种含硫汽车曲轴用非调质钢及其生产工艺其组成成分按质量百分数计为:C:0.39~0.42%、Si:0.65~0.75%、Mn:1.40~1.50%、P≤0.020%、S:0.075~0.085%、Cr:0.15~0.20%、V:0.10~0.12%、Al:0.010~0.025%、Ni:0.10~0.15%、Cu:≤0.018%、Nb:≤0.05%、Mo:≤0.15%、Ti:0.010~0.025%、Te:≤0.012%、H:≤1.5ppm、O:≤25ppm、N:0.013~0.019%,余量为Fe和不可避免的杂质,锰当量Mnev为1.63‑1.78%,工艺包括依次的电炉炼钢、LF精炼、VD真空处理、连铸、加热和轧制工序,VD真空处理工序中破空按氮化锰线→钛线→硅钙线→硫线→碲锰线顺序喂线控制硫化物形态,通过电炉、LF精炼、VD、连铸和轧制参数设定形成一套完整的微合金易切削汽车曲轴用非调钢生产工艺,可以有效控制硫化物夹杂≤1.0级、获得良好的力学性能。
Description
技术领域
本发明属于非调质钢技术领域,具体涉及一种含硫汽车曲轴用非调质钢及其生产工艺。
背景技术
汽车曲轴是发动机的主要旋转机件、负责将活塞的上下往复运动转变为自身的圆周运动,曲轴的复杂条件决定了曲轴材料必须具有较高的力学性能。汽车曲轴用非调质钢一般指在中碳钢中添加V、Ti、Nb和N等微量合金元素,通过在铁素体和珠光体中弥散析出碳/氮化合物为强化相,使之在轧制/锻制后不经调质处理,获得碳素结构钢或合金结构钢经调质处理后所达到的力学性能的钢种。为改善锻造后的切削性能往往向钢种加入大量的硫元素,一方面此类钢种含有较高的锰元素,在凝固过程中形成易变形物质MnS,在后续轧制/锻造中变形拉长,使金属呈现出各向异性,产品力学性能恶化,难以满足成品质量要求,另一方面冶炼此钢种采用Al脱氧,浇注过程中易形成絮流、絮流物吸附于水口内壁导致钢水通道堵塞等问题,连铸参数及工艺不当导致低倍质量较差和MnS的中心偏析,控温轧制/锻造控温冷却导致钢材组织粗大、影响钢材塑性和强度,从而难以满足含硫汽车曲轴应用需求。
发明内容
本发明旨在至少在一定程度上解决上述技术问题之一,本发明提供一种含硫汽车曲轴用非调质钢及其生产工艺,通过一整套的冶炼、连铸、轧制工艺使硫化物夹杂得到有效控制,力学性能等成品质量满足要求。
本发明解决其技术问题所采用的技术方案是:
一种含硫汽车曲轴用非调质钢,其组成成分按质量百分数计为:C:0.39~0.42%、Si:0.65~0.75%、Mn:1.40~1.50%、P≤0.020%、S:0.075~0.085%、Cr:0.15~0.20%、V:0.10~0.12%、Al:0.010~0.025%、Ni:0.10~0.15%、Cu:≤0.018%、Nb:≤0.05%、Mo:≤0.15%、Ti:0.010~0.025%、Te:≤0.012%、H:≤1.5ppm、O:≤25ppm、N:0.013~0.019%,余量为Fe和不可避免的杂质,锰当量Mnev=Mn+1.5*Cr+2*Mo+0.35*Ni+0.17*Cu=1.63-1.78%,硫化物夹杂≤3.0级。
上述含硫汽车曲轴用非调质钢,进一步地,目标值:Mnev=1.70%。
上述含硫汽车曲轴用非调质钢的成分设计中:
C:提高C含量有利于提高强度,但C含量含量过高易降低塑性和热性。
Mnev:保证锰当量具有较高的韧性、强度和硬度,利于提高钢的淬性、改善钢的加工性能。
Te:通过形成Mn、S、Te的共晶化合物使得MnS夹杂物发生球化,在凝固时碲化物会包覆于MnS周围而呈球冠状,相较于MnS,MnTe质量分数极小,在包覆时会使MnS发生晶格畸变,阻止了MnTe在横向上的生长,使得MnS不会出现条状、链状,避免易变形MnS在后续轧制/锻造过程中变形劣化产品力学性能;但Te过高会造成晶间催化、降低持久强度;Mn/Te/S含量的控制显著降低硫化物夹杂的同时兼顾含硫汽车曲轴用非调质钢的力学性能要求。
上述含硫汽车曲轴用非调质钢,进一步地,所述非调质钢的抗拉强度可达958MPa,屈服强度可达635MPa以上,-20℃冲击KU2J可达38J以上,断后伸长率可达16%以上,断后收缩率可达35%及以上。
上述含硫汽车曲轴用非调质钢的生产工艺,生产工艺包括将炼钢原料依次经电炉炼钢、LF精炼、VD真空处理、连铸工序得到的连铸坯,VD真空处理工序中破空喂入氮化锰线增氮、喂钛线增钛、碲锰线进行碲处理控制硫化物形态、喂硅钙线进行钙处理,将连铸坯依次经加热、轧制工序得到硫化物夹杂≤1.0级的非调质钢。
上述含硫汽车曲轴用非调质钢的生产工艺,进一步地,所述电炉炼钢工序控制电炉出钢终点C:0.23~0.33%,Si:0.42~0.57%,Mn:1.10~1.25%,Cr:0.07~0.17%,目标P≤0.013%,目标温度T≥1580℃,出钢前打开底吹氩气,出钢过程中全程吹氩,出钢过程中,每炉100-110t钢水中加入500kg石灰、400kg促净剂、120kg铝、1663kg硅锰合金和118kg硅铁合金。
上述含硫汽车曲轴用非调质钢的生产工艺,进一步地,所述LF精炼工序根据LF精炼补喂铝线,初炼铝目标值为0.025-0.050%,仅可调整一次;LF精炼前期根据渣况,每炉100-110t钢水补加0-100kg石灰进行CaO调渣,采用Fe-Si粉及Si-C渣面扩散脱氧,白渣时间≥20min,冶炼时间≥35min,LF出站前加200kg硅砂调渣。
上述含硫汽车曲轴用非调质钢的生产工艺,进一步地,所述LF精炼过程保持氩气通畅,LF精炼前期氩气流量为200-400NL/min,LF精炼中期氩气流量为120-250NL/min,LF精炼后期氩气流量为60-150NL/min。
上述含硫汽车曲轴用非调质钢的生产工艺,进一步地,所述VD真空处理工序中到站先喂硫磺线使硫含量达到目标值,随后真空处理,控制最高真空度≤67pa,高真空保持时间≥12min,氮气软吹时间≥15min。
上述含硫汽车曲轴用非调质钢的生产工艺,进一步地,所述VD真空处理工序中喂线顺序依次为氮化锰线、钛线、硅钙线、硫线和碲锰线,碲锰线70m/炉,硅钙线50-60m/炉。
上述含硫汽车曲轴用非调质钢的生产工艺,进一步地,所述连铸工序控制过热度在25-35℃之间,采用二冷冷却配合结晶器电磁搅拌、铸流搅拌和末端电磁搅拌,一冷水流量为3200-3400L/min,二冷水1区水流量为52-58L/min,二冷水2a区水流量为34-40L/min,二冷水2b区水流量为9-13L/min,结晶器电磁搅拌电流240-260A、频率为2Hz,铸流搅拌电流为190-210A、频率为8Hz,末端电磁搅拌电流为1090-1110A、频率为8Hz,控制拉速为0.65m/min。
上述含硫汽车曲轴用非调质钢的生产工艺,进一步地,所述加热工序的加热程序为:预热段温度预热段温度<920℃,预热段目标温度870℃,加热I段时间>0.75h、加热I段温度900-1100℃,加热I段目标温度1000℃,加热II段时间≥0.75h、加热II段温度1180-1280℃,加热II段目标温度1230℃,均热段温度1200-1260℃,均热段目标温度1240℃,加热II段和均热段时间为2.5-3h,总加热时间为5-6h。
上述含硫汽车曲轴用非调质钢的生产工艺,进一步地,所述轧制工序包括采用9机架连轧机轧制,开轧温度850-890℃,目标温度880℃下轧制,在温度≥400℃入坑缓冷,目标温度420℃,缓冷可以不盖盖子,缓冷时间≥24h,缓冷至温度≤200℃出坑。
与现有技术相比,本发明的有益效果是:
(1)通过电炉炼钢的出钢成分、温度、渣料控制前期初步合金化,并充分脱氧。
(2)通过LF精炼的脱氧工艺和冶炼周期控制保证合金成分精准控制、确保钢水纯净度;
(3)通过VD真空处理的脱气、包括碲处理的喂线工艺后,Mn/Te/S含量的控制使A类夹杂物由长条装变成球状,阻止了MnTe在横向上的生长,显著降低硫化物夹杂。
(4)通过连铸参数的设定、低过热度浇注、有效控制枝晶产生、低倍质量及中心偏析。减弱MnS的中心偏析。
(5)通过加热、低温轧制和缓冷参数的设定使钢材具有良好的塑性,组织细小,强度增加。
通过成分设计和电炉炼钢、LF精炼、VD、连铸、轧制工艺的设定,形成一套完整的微合金易切削汽车曲轴用非调钢及生产工艺,通过此工艺的实施可以有效控制硫化物夹杂、获得良好的力学性能,使硫化物夹杂≤1.0级,抗拉强度可达958MPa,屈服强度可达635MPa以上,-20℃冲击KU2J可达38J以上,断后伸长率可达16%以上,断后收缩率可达35%及以上,成品质量满足要求。
附图说明
本发明的上述和/或附加的方面和优点从结合下面附图对实施例的描述中将变得明显和容易理解,其中:
图1是本发明实施例与对比例的硫化物形态对比图。
图1(a)表示实施例1的硫化物形态图;图1(b)表示实施例2的硫化物形态图;图1(c)表示对比例1的硫化物形态图;图1(d)表示对比例2的硫化物形态图。
具体实施方式
下面详细描述本发明的实施例,所述实施例的示例在附图中示出,其中自始至终相同或类似的标号表示相同或类似的元件或具有相同或类似功能的元件。下面通过参考附图描述的实施例是示例性的,旨在用于解释本发明,而不能理解为对本发明的限制。
实施例1:
本发明所述一种含硫汽车曲轴用非调质钢的一种较佳实施方式,所述非调质钢的组成成分按质量百分数计为:C:0.40%、Si:0.69%、Mn:1.45%、P:0.009%、S:0.080%、Cr:0.17%、Ni:0.11%、Cu:0.018%、Mo:0.018%、V:0.1%、Nb:0.0038%、Ti:0.015%、Al:0.010%、Te:0.0096%、H:1.2ppm、O:8.9ppm、N:177ppm,余量为Fe和不可避免的杂质,锰当量Mnev=Mn+1.5*Cr+2*Mo+0.35*Ni+0.17*Cu=1.78%。
实施例2:
本发明所述一种含硫汽车曲轴用非调质钢的一种较佳实施方式,所述非调质钢的组成成分按质量百分数计为:C:0.395%、Si:0.66%、Mn:1.44%、P:0.010%、S:0.084%、Cr:0.16%、Ni:0.10%、Cu:0.018%、Mo:0.018%、V:0.1%、Nb:0.0038%、Ti:0.014%、Al:0.010%、Te:0.0096%、H:1.2ppm、O:8.9ppm、N:175ppm,余量为Fe和不可避免的杂质,锰当量Mnev=Mn+1.5*Cr+2*Mo+0.35*Ni+0.17*Cu=1.75%。
实施例3:
本发明所述一种含硫汽车曲轴用非调质钢的一种较佳实施方式,所述非调质钢的组成成分按质量百分数计为:C:0.41%、Si:0.70%、Mn:1.43%、P:0.009%、S:0.083%、Cr:0.17%、Ni:0.11%、Cu:0.018%、Mo:0.018%、V:0.1%、Nb:0.0038%、Ti:0.014%、Al:0.010%、Te:0.0096%、H:1.2ppm、O:8.9ppm、N:165ppm,余量为Fe和不可避免的杂质,锰当量Mnev=Mn+1.5*Cr+2*Mo+0.35*Ni+0.17*Cu=1.76%。
上述实施例1-3的生产工艺,包括以下步骤:
S1、电炉炼钢:将炼钢原料经电炉冶炼得到钢水,控制电炉出钢终点C:0.23~0.33%,Si:0.42~0.57%,Mn:1.10~1.25%,Cr:0.07~0.17%;防止钢水过氧化,有利于夹杂物的去除,控制电炉出钢目标P≤0.013%,目标温度T≥1580℃,控制合适的出钢温度,有效控制钢水回P;出钢前打开底吹氩气,出钢过程中全程吹氩,保证出钢铁水与合金充分接触融化,电炉出钢105t,出钢严禁下渣;
出钢过程中,每炉钢水中按顺序加入120kg铝、1663kg硅锰合金(FeMn68Si18)、118kg硅铁合金(Si≥72%)、400kg促净剂(CaO53.5%,SiO23.5%,Al2O334.3%,MgO8.5%)和500kg石灰,前期初步合金化,并充分脱氧,出钢结束后及时吊至LF工位;
S2、LF精炼:根据LF精炼补喂铝线,以促进前期脱氧,初炼铝目标值为0.025-0.050%,仅可调整一次;LF精炼前期根据渣况,每炉100-110t钢水补加0-100kg石灰进行CaO调渣,采用Fe-Si粉(FeSi75-B)及Si-C(SiC-70)渣面扩散脱氧,白渣时间≥20min,冶炼时间≥35min,LF出站前加200kg硅砂调渣;
LF精炼过程保持氩气通畅,LF精炼前期适当调大氩气搅拌,氩气流量为200-400NL/min,促进脱氧及合金化,LF精炼中期加合金调成分阶段均保持氩气中等氩气强度,氩气流量为120-250NL/min,LF精炼后期避免钢水翻滚氧化,氩气流量为60-150NL/min;
S3、VD真空处理:将经步骤S2的钢水进VD站先喂硫磺线,硫含量达到目标值0.075~0.085%;随后真空处理,控制最高真空度≤67pa,高真空保持时间≥12min,氮气软吹时间≥15min,去除钢水中的H,确保夹杂物充分上浮;破空喂入氮化锰线增氮、喂钛线增钛、碲锰线70m/炉进行碲处理控制硫化物形态、喂硅钙线50-60m/炉进行钙处理,喂线顺序为氮化锰线→钛线→硅钙线→硫线→碲锰线;
经过VD工序碲处理后,形成Mn、S、Te的共晶化合物;碲的加入使得MnS夹杂物发生球化,在凝固时碲化物会包覆于MnS周围而呈球冠状,A类夹杂物由长条装变成球状;相较于MnS,MnTe质量分数极小,在包覆时会使MnS发生晶格畸变,阻止了MnTe在横向上的生长,使得MnS不会出现条状、链状,避免易变形MnS在后续轧制/锻造过程中变形劣化产品力学性能;
S4、连铸:控制过热度在25-35℃之间,将经步骤S3的钢水进低过热度、全程保护浇注防止二次氧化,采用二冷冷却配合结晶器电磁搅拌、铸流搅拌和末端电磁搅拌,一冷水流量为3200-3400L/min,一冷水快冷增加柱状晶比例使钢坯致密性更好,二冷水1区水流量为52-58L/min,二冷水2a区水流量为34-40L/min,二冷水2b区水流量为9-13L/min,通过二冷水水量有效控制枝晶产生,进而控制枝晶偏析;结晶器电磁搅拌电流250A、频率为2Hz,铸流搅拌电流为200A、频率为8Hz,末端电磁搅拌电流为1100A、频率为8Hz,控制拉速为0.65m/min得到连铸坯,通过电磁搅拌技术有效控制低倍质量及中心偏析,减弱MnS的中心偏析;
S5、加热:将步骤S4的连铸坯送至加热炉加热,加热炉的加热程序为:预热段温度预热段温度<920℃,预热段目标温度870℃,钢坯预热减小钢坯开裂的风险,加热I段时间>0.75h、加热I段温度900-1100℃,加热I段目标温度1000℃,加热II段时间≥0.75h、加热II段温度1180-1280℃,加热II段目标温度1230℃,均热段温度1200-1260℃,均热段目标温度1240℃,加热II段和均热段时间为2.5-3h,总加热时间为5-6h,通过两段加热及一段均热,充分的加热时间保证连铸坯内外部加热均匀而又符合轧制要求的最佳温度,均热段目标温度1240℃使钢材具有良好的塑性,保证开坯顺利;
S6、轧制:将经步骤S5的连铸坯经开坯机后轧制成210mm*230mm的中间坯,经液压剪切头尾,采用9机架连轧机轧制,开轧温度850-890℃,目标温度880℃,采用大压缩量、大下压量轧制为热轧圆管坯,控制开轧温度在850-890℃实现低温轧制值,有效控制钢材晶粒度,促进先共析铁素体析出,使组织为均匀细小的珠光体与铁素体组织;
热轧圆管坯入冷床空冷,在冷床温度≥400℃入坑缓冷,目标温度420℃实现低温收集,缓冷可以不盖盖子,缓冷时间≥24h,缓冷至温度≤200℃出坑,使钢材组织细小,强度增加,得到热轧圆管坯,热轧圆管坯依次经取样、精整、探伤后入库。
对实施例1至实施例3的产品按检测标准:EN ISO 6892-1,进行拉伸性能测试,其结果如下表1所示:
实施例 | Rm(MPa) | ReL(MPa) | A% | Z% |
实施例1 | 958 | 651 | 16.5 | 35 |
实施例2 | 959 | 642 | 17 | 42 |
实施例3 | 946 | 635 | 16.5 | 40 |
对实施例1至实施例3的产品按检测标准:EN ISO 148-1,进行冲击性能测试,其结果如下表2所示:
由表1和表2可知,根据本发明的三种实施例的含硫汽车曲轴用非调质钢,对应的抗拉强度、屈服强度、冲击功、断后伸长率均得到有效控制,具有调质钢的性能,便于切削的特性,所述非调质钢的抗拉强度可达958MPa,屈服强度可达635MPa以上,-20℃冲击KU2J可达38J以上,断后伸长率可达16%以上,断后收缩率可达35%及以上。
对比例1与实施例1成分区别在于不含Te,对比例2与实施例2成分区别在于不含Te,对比例3与实施例3成分区别在于不含Te,对比例1-3的生产工艺与实施例1-3的生产工艺区别在于VD真空处理破空后不进行碲处理。
对实施例1-3、对比例1-3的产品分别按GB/T 10561进行夹杂物评级,检测硫化物夹杂(Ae、A),检测结果如下附图1和下表3所示:
编号 | Ae | A |
实施例1 | 1 | 0.5 |
实施例2 | 1 | 1 |
实施例3 | 1 | 1 |
对比例1 | 2 | 2.5 |
对比例2 | 2 | 2.5 |
对比例3 | 2 | 2.5 |
由附图1和表3可知,根据本发明的三种实施例的含硫汽车曲轴用非调质钢,满足钢种硫化物夹杂标准要求≤3.0级,分别按EN 10308标准平底孔当量进行超声波探伤,喂入碲锰线圆钢硫化物评级大大降低,硫化物级别可稳定控制在1.0级及以内。
本发明通过电炉炼钢的出钢成分、温度、渣料控制前期初步合金化,并充分脱氧,通过LF精炼的脱氧工艺和冶炼周期控制保证合金成分精准控制、确保钢水纯净度;通过VD真空处理的脱气、包括碲处理的喂线工艺后,形成Mn、S、Te的共晶化合物,使A类夹杂物由长条装变成球状,在凝固时碲化物会包覆于MnS周围而呈球冠状,阻止了MnTe在横向上的生长,显著降低硫化物夹杂;通过连铸参数的设定、低过热度浇注、有效控制枝晶产生、低倍质量及中心偏析,减弱MnS的中心偏析;通过加热、低温轧制和缓冷参数的设定使钢材具有良好的塑性,组织细小,强度增加;综上形成一套完整的微合金易切削汽车曲轴用非调钢生产工艺,通过此工艺的实施可以有效控制硫化物夹杂,有效保证产品力学性能。
上文所列出的一系列的详细说明仅仅是针对本发明的可行性实施例的具体说明,它们并非用以限制本发明的保护范围,凡未脱离本发明技艺精神所作的等效实施例或变更均应包含在本发明的保护范围之内。
Claims (10)
1.一种含硫汽车曲轴用非调质钢,其特征在于,其组成成分按质量百分数计为:C:0.39~0.42%、Si:0.65~0.75%、Mn:1.40~1.50%、P≤0.020%、S:0.075~0.085%、Cr:0.15~0.20%、V:0.10~0.12%、Al:0.010~0.025%、Ni:0.10~0.15%、Cu:≤0.018%、Nb:≤0.05%、Mo:≤0.15%、Ti:0.010~0.025%、Te:≤0.012%、H:≤1.5ppm、O:≤25ppm、N:0.013~0.019%,余量为Fe和不可避免的杂质,锰当量Mnev=Mn+1.5*Cr+2*Mo+0.35*Ni+0.17*Cu=1.63-1.78%,硫化物夹杂≤3.0级。
2.根据权利要求1所述的一种含硫汽车曲轴用非调质钢的生产工艺,其特征在于,生产工艺包括将炼钢原料依次经电炉炼钢、LF精炼、VD真空处理、连铸工序得到的连铸坯,VD真空处理工序中破空喂入氮化锰线增氮、喂钛线增钛、碲锰线进行碲处理控制硫化物形态、喂硅钙线进行钙处理,将连铸坯依次经加热、轧制工序得到硫化物夹杂≤1.0级的非调质钢。
3.根据权利要求2所述的一种含硫汽车曲轴用非调质钢的生产工艺,其特征在于,所述电炉炼钢工序控制电炉出钢终点C:0.23~0.33%,Si:0.42~0.57%,Mn:1.10~1.25%,Cr:0.07~0.17%,目标P≤0.013%,目标温度T≥1580℃,出钢前打开底吹氩气,出钢过程中全程吹氩,出钢过程中,每炉100-110t钢水中加入500kg石灰、400kg促净剂、120kg铝、1663kg硅锰合金和118kg硅铁合金。
4.根据权利要求2所述的一种含硫汽车曲轴用非调质钢的生产工艺,其特征在于,所述LF精炼工序根据LF精炼补喂铝线,初炼铝目标值为0.025-0.050%,仅可调整一次;LF精炼前期根据渣况,每炉100-110t钢水补加0-100kg石灰进行CaO调渣,采用Fe-Si粉及Si-C渣面扩散脱氧,白渣时间≥20min,冶炼时间≥35min,LF出站前加200kg硅砂调渣。
5.根据权利要求2所述的一种含硫汽车曲轴用非调质钢的生产工艺,其特征在于,所述LF精炼过程保持氩气通畅,LF精炼前期氩气流量为200-400NL/min,LF精炼中期氩气流量为120-250NL/min,LF精炼后期氩气流量为60-150NL/min。
6.根据权利要求2所述的一种含硫汽车曲轴用非调质钢的生产工艺,其特征在于,所述VD真空处理工序中到站先喂硫磺线使硫含量达到目标值,随后真空处理,控制最高真空度≤67pa,高真空保持时间≥12min,氮气软吹时间≥15min。
7.根据权利要求2所述的一种含硫汽车曲轴用非调质钢的生产工艺,其特征在于,所述VD真空处理工序中喂线顺序依次为氮化锰线、钛线、硅钙线、硫线和碲锰线,碲锰线70m/炉,硅钙线50-60m/炉。
8.根据权利要求2所述的一种含硫汽车曲轴用非调质钢的生产工艺,其特征在于,所述连铸工序控制过热度在25-35℃之间,采用二冷冷却配合结晶器电磁搅拌、铸流搅拌和末端电磁搅拌,一冷水流量为3200-3400L/min,二冷水1区水流量为52-58L/min,二冷水2a区水流量为34-40L/min,二冷水2b区水流量为9-13L/min,结晶器电磁搅拌电流240-260A、频率为2Hz,铸流搅拌电流为190-210A、频率为8Hz,末端电磁搅拌电流为1090-1110A、频率为8Hz,控制拉速为0.65m/min。
9.根据权利要求2所述的一种含硫汽车曲轴用非调质钢的生产工艺,其特征在于,所述加热工序的加热程序为:预热段温度预热段温度<920℃,预热段目标温度870℃,加热I段时间>0.75h、加热I段温度900-1100℃,加热I段目标温度1000℃,加热II段时间≥0.75h、加热II段温度1180-1280℃,加热II段目标温度1230℃,均热段温度1200-1260℃,均热段目标温度1240℃,加热II段和均热段时间为2.5-3h,总加热时间为5-6h。
10.根据权利要求1~9任意一项所述的一种含硫汽车曲轴用非调质钢的生产工艺,其特征在于,所述轧制工序包括采用9机架连轧机轧制,开轧温度850-890℃,目标温度880℃下轧制,在温度≥400℃入坑缓冷,目标温度420℃,缓冷可以不盖盖子,缓冷时间≥24h,缓冷至温度≤200℃出坑。
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