CN117107156A - 一种矿山用高强度锯片基体用钢及其生产方法 - Google Patents
一种矿山用高强度锯片基体用钢及其生产方法 Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 111
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- 229910000519 Ferrosilicon Inorganic materials 0.000 claims description 4
- 229910001200 Ferrotitanium Inorganic materials 0.000 claims description 4
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims description 4
- 238000003723 Smelting Methods 0.000 claims description 4
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- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
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Abstract
本发明公开了一种矿山用高强度锯片基体用钢及其生产方法,工艺流程包括转炉冶炼、精炼、连铸、加热轧制、调质热处理(淬火+回火)、性能检验、检查入库。钢的化学组成质量百分比为C=0.17%~0.20%,Si=0.17%~0.37%,Mn=1.40%~1.60%,Ti=0.04%~0.08%,B=0.0010%~0.0020%,P≤0.015%,S≤0.003%,Als=0.02%~0.050%,余量为Fe和不可避免的杂质。生产的钢板屈服强度≥800MPa,抗拉强度≥1000MPa,该锯片用钢具有合金成本低、易焊接、环境友好、具有高淬硬性、高热稳定性的同时又具有高的韧塑性的特性,可以大幅度提高使用寿命。
Description
技术领域
本发明属于钢铁冶金技术,涉及一种矿山用高强度锯片基体用钢及其生产方法。
背景技术
矿山开采用锯片基体用钢是由高强度高耐磨性2.0~16.0mm热轧薄板制成,要求具备高强度高硬度和一定的韧性。传统上矿山用圆盘锯片的生产方式为钢厂负责锯片基体用板材的生产,由锯片生产厂家加工成圆片体,加工完成后在锯片钢周边再焊接一圈锯齿制成锯片。对于直径小于2000mm的锯片采用热连轧机组轧制生产,而直径超过2000mm采用拼焊工艺或者由中厚板轧机轧制生产。
目前钢厂生产的矿山锯片基体用钢常用材质有75CrL、65Mn、52Mn2V等,都以高碳、高合金成分为主,强度高、刚度高但塑韧性较差,且合金成本高,碳当量高在锯片生产中不易焊接,加工与使用过程中容易产生裂纹使用寿命短。并且添加Mo、Cr、Ni合金元素会在钢板表面形成附着力较强的氧化铁皮,影响锯片钢的表面质量,增加了后续的修磨成本。
综上所述,为适应国内外建材、建筑市场对锯片质量不断提高的发展趋势,适应矿山企业需求,开发高性能低成本锯片基体用钢。
中国专利CN102296243A公开了“一种金钢石锯片基体用钢及其生产方法”,化学成分为:C:0.67%~0.75%,Si:0.17%~0.37%,Mn:0.9%~1.20%,Cr:0.4%~0.7%,Ni≤0.25%,Cu≤0.2%的热处理中厚板,碳含量高并含有Ni和较高的Cr元素,合金成本较高,且易出偏析等缺陷,影响使用寿命,同时含有一定量的Cu不利于铸坯表面裂纹的控制。
中国专利CN104178691A公开了“一种高强度冶金锯片用钢及其制造方法”,化学成分:C:0.30%~0.60%,Si:0.15%~0.30%,Mn:1.35%~1.9%,V:0.070%~0.19%,Al:0.025%~0.055%的热处理钢板,淬火+回火后成品钢板硬度28~40HRC波动范围大,不适合直接加工制作直径2000mm以上锯片基体。
中国专利CN 106319378 B公开了“一种大直径薄锯片基体用钢及其制造方法”,化学成分:C:0.72%~0.95%,Si:0.06%~0.40%,Mn:0.5%~0.95%,Cr:0.10%~0.39%,V:0.03%~0.080%,Ni≤0.5%,且H≤0.0002%,杂质元素P≤0.015%,S≤0.010%和Al≤0.010%的热处理钢板,其C、Mn含量极高,不利于刀头的焊接,同时Cr、Ni贵重合金元素含量高,合金成本高。并且后续锯片制造单位要进行油淬淬火,对淬火介质要求高并且污染环境。
中国专利CN 104178691 A公开了“一种高强度冶金锯片用钢及其热处理方法”,化学成分:C 0.30%-0.60%、Si 0.15%-0.30%、Mn 1.35%-1.90%、P≤0.020%、S≤0.005%、V 0.07%-0.19%,、Al 0.025%-0.055%,其余为Fe。C含量较高并且含0.07-0.19%的V,不利于连铸坯裂纹的控制,其淬火终冷温度要求200~300℃对于中薄规格板生产中实际控制难度较大。
上述已有技术的钢种存在的一些不足之处,不能满足目前矿用锯片行业的发展要求。因此,急需开发一种具有高淬硬性、高热稳定性、易焊接同时又具有高韧塑性,可以明显提高锯片使用寿命的新型锯片基体用钢。
发明内容
本发明旨在提供一种矿山用高强度锯片基体用钢及其生产方法。该锯片基体用钢具有合金成本低、易焊接、节能环保、具有高淬硬性、高热稳定性的同时又具有高的韧塑性的特性,可以大幅度提高使用寿命。
本发明的技术方案:
一种矿山用高强度锯片基体用钢钢的化学组成质量百分比为C=0.17%~0.20%,Si=0.17%~0.37%,Mn=1.40%~1.60%,Ti=0.04%~0.08%,B=0.0010%~0.0020%,P≤0.015%,S≤0.003%,Als=0.02%~0.050%,余量为Fe和不可避免的杂质;钢板屈服强度≥800MPa,抗拉强度≥1000MPa;钢板交货状态为QT。
一种矿山用高强度锯片基体用钢的生产方法,工艺流程包括转炉冶炼、精炼、连铸、加热轧制、调质热处理、性能检验、检查入库,其特征在于关键工艺步骤包括:
(1)转炉:出钢C控制在0.06%以上,P控制在0.015%以下,出钢温度1600~1620℃,出钢过程加入硅铁、金属锰合金以及铝铁脱氧和石灰、预熔渣;出钢完后喂入Al线,使钢水中Als含量在0.020~0.040%;
(2)LF炉:钢水进LF炉冶炼,加入石灰和预熔渣12~15kg/t钢水进行造渣,加入SiC和Al粒进行扩散脱氧,钢水中Als含量控制在0.02%~0.05%;将C、Si、Mn、S元素调整至要求范围后,白渣保持时间≥20min,出站前加入钛铁,将钢水Ti含量控制在0.04%以上,软吹大于等于5min,喂入钙线0.3~0.4kg/t钢水;
(3)RH炉:RH炉全程吹氩气,真空度在<67Pa下保持15min以上;破空后加入B铁,钢水B含量0.0010~0.0020%,软吹≥15min;
(4)连铸:连铸全程保护浇铸,采用动态轻压下技术,中包过热度控制在6~13℃;连铸保护渣采用专用中碳保护渣,二冷比水量控制在0.33~0.37L/kg;
(5)轧制:板坯温度控制在1240~1260℃,粗轧开轧温度≥1200℃,精轧开轧温度≥1050℃,轧制过程采用高温大压下快轧制,粗轧终轧阶段保证有至少一道次压下率大于20%,精轧后不打水,空冷至室温;
(6)淬火:淬火温度870~900℃,到达目标温度后保温10~15分钟,然后采用5bar压力淬火水冷;
(7)回火:淬火后钢板400~500℃装炉回火,到达目标温度后保温10~15分钟,然后空冷;
本发明钢各合金成分作用机理:
C是钢中主要的固溶强化元素。C含量0.17%~0.20%既可以保证强度又可以降低碳当量改善焊接性能,降低C偏析,提高钢的塑性。
Mn是保证钢的强度和韧性的必要元素,同时对塑性影响不大。锰固溶于奥氏体中,能够剧烈降低马氏体转变温度。Mn容易与残余元素S结合形成MnS,避免晶界处形成FeS薄膜,而导致的热裂纹影响锯片用钢的热加工性。同时Mn也可以增加淬透性。本发明Mn含量较低为1.40%~1.60%,能够满足热处理后高强硬性的要求,Mn含量过高易增加偏析带影响焊接性能,且增加生产成本。
Si是钢中常用合金元素,也是在炼钢过程中用作还原剂和脱氧剂,Si以固溶体形态存在于奥氏体中,能够显著提高钢的弹性极限、屈服强度并提高疲劳强度,改善耐磨性能,但含量较高时能降低钢的塑性和韧性以及焊接性能。
冶炼时一般用Al作脱氧剂使用,也可以细化晶粒,提高强度,但同时也易形成含Al的氧化物夹杂,影响钢的疲劳性能。为保证锯片钢的疲劳性能,延长使用铸命,本发明锯片钢对Als含量的限制为0.020%~0.050%,既能够充分脱氧,也能够提高性能。
B元素能够在晶界聚集,降低晶界能,添加微量的B能够显著提高钢的淬透性,同时不影响钢的显微组织,B元素可以提高钢的耐热性。由于B的活性较强,容易与C、N元素形成化合物,因此要保证B元素处于固溶状态,过量的B会导致钢的热脆现象,影响热加工性,一般控在0.0050%以下,本发明中B含量为0.0010%~0.0020%。
Ti是良好的脱氧剂和固定氮和碳的元素,控制轧制过程中形成Ti(CN)粒子可以有效细化晶粒,同样有利于焊接性能的提高,能够改善碳素钢的热强性,提高蠕变抗力,以固溶态存在的Ti还可以提高钢的淬透性,合金成本低,在本发明中Ti是重要的合金元素添加,含量为0.04%~0.08%。
P和S都是钢中不可避免的有害杂质,它们的存在会严重恶化钢的韧性,影响疲劳性能,缩短锯片使用寿命。因此要采取措施使钢中的P和S含量尽可能降低,根据本发明,最高P含量限制在0.015%,最高S含量限制在0.003%。
与现有技术相比,本发明具有以下优点:
本发明采用C-Si-Mn-Ti成分,加入B提高钢的淬透性,不需加入其它合金元素,合金成本低,通过合适的炼钢工艺保证钢水的纯净度,采用低过热度结合动态轻压下保证铸坯内部质量,碳当量低,钢的塑性和焊接性能好,成品钢板调质后屈服强度Rp0.2≥1000MPa范围,抗拉强度Rm≥1200MPa,延伸率A50≥12%,整板表面硬度为30~35HRC,0℃冲击功值≥50J,完全能满足矿山用高强度锯片基体用钢的要求。锯片生产厂反馈采用该成分体系的锯片基体用钢生产的锯片具备刚性好、偏摆小、切割速度更快、锯缝平直,可提高矿山出材率,矿山产量高,省点、省刀头,综合效益至少提高20%;锯片不易出现变形、裂纹等质量问题;安全系数高;符合目前安全、节能、环保的要求,非常适用于矿山大规格荒料的开采。目前已在广西、河南、内蒙等多地矿山进行使用,深受客户欢迎。
附图说明
图1为12mm×4820mm钢板金相组织图,可以看出组织为回火索氏体组织,整体组织较为均匀细小,是该钢种的理想组织。
具体实施方式
下面结合实施例对本发明做进一步描述。
实施例1
一种矿山用高强度锯片基体用钢及其生产方法,钢的化学成分百分比见表1;工艺流程包括转炉→LF炉→RH炉→连铸→轧制→淬火→回火→性能检验,关键工艺步骤如下:
(1)转炉:出钢C含量0.08%,P含量0.011%,出钢温度1608℃,出钢过程加入硅铁、金属锰合金进行合金化,加入铝铁进行脱氧,加入适量的石灰、预熔渣造渣,出站Als含量0.035%;
(2)LF炉:加入石灰和预熔渣共计13.8kg/t钢水,加入SiC 1.0kg/t钢水和Al粒SiC0.3kg/t,钢水过程Als含量0.02%~0.05%;将C、Si、Mn、S元素调整至要求范围后,白渣保持时间28min,出站前加入钛铁,出站Ti含量0.085%,软吹5min,喂入钙线0.35kg/t钢水;
(3)RH炉:RH全程吹氩气,真空度在<67Pa下保持16min,破空后加入B铁,出站B含量0.0018%,软吹18min出站;
(4)连铸:连铸全程保护浇铸,采用动态轻压下技术,中包过热度8~11℃,通钢量4.0t/min;连铸保护渣采用专用模具钢保护渣,配水采用弱冷,二冷比水量控制在0.35L/kg。
轧制与热处理工艺参数如表2。钢的物理性能检验结果如表3。
实施例2
一种矿山用高强度锯片基体用钢及其生产方法,钢的化学成分百分比见表1;工艺流程包括转炉→LF炉→RH炉→连铸→轧制→淬火→回火→性能检验,关键工艺步骤如下:
(1)转炉:出钢C含量0.07%,P含量0.009%,出钢温度1616℃,出钢过程加入硅铁、金属锰合金进行合金化,加入铝铁进行脱氧,加入适量的石灰、预熔渣造渣,出站Als含量0.029%;
(2)LF炉:加入石灰和预熔渣共计14.2kg/t钢水,加入SiC 0.9kg/t钢水和Al粒SiC0.4kg/t,钢水过程Als含量0.02%~0.05%;将C、Si、Mn、S元素调整至要求范围后,白渣保持时间37min,出站前加入钛铁,出站Ti含量0.087%,软吹5min,喂入钙线0.35kg/t钢水;
(3)RH炉:RH全程吹氩气,真空度在<67Pa下保持16min,破空后加入B铁,出站B含量0.0017%,软吹20min出站;
(4)连铸:连铸全程保护浇铸,采用动态轻压下技术,中包过热度9~11℃,通钢量4.0t/min;连铸保护渣采用专用模具钢保护渣,配水采用弱冷,二冷比水量控制在0.35L/kg;
轧制与热处理工艺参数如表2。钢的物理性能检验结果如表3。
表1实施例钢的化学成分(wt,%)
化学元素 | C | Si | Mn | P | S | Als | Ti | B |
实施例1 | 0.19 | 0.26 | 1.51 | 0.013 | 0.002 | 0.033 | 0.070 | 0.0017 |
实施例2 | 0.18 | 0.27 | 1.52 | 0.012 | 0.002 | 0.030 | 0.071 | 0.0016 |
表2 12mm×4820mm锯片钢轧制与调质热处理工艺参数
表3 12mm×4820mm锯片钢力学性能
Claims (2)
1.一种矿山用高强度锯片基体用钢,其特征在于:钢的化学组成质量百分比为C=0.17%~0.20%,Si=0.17%~0.37%,Mn=1.40%~1.60%,Ti=0.04%~0.08%,B=0.0010%~0.0020%,P≤0.015%,S≤0.003%,Als=0.02%~0.050%,余量为Fe和不可避免的杂质;钢板屈服强度≥800MPa,抗拉强度≥1000MPa;钢板交货状态为QT。
2.一种矿山用高强度锯片基体用钢的生产方法,工艺流程转炉→LF炉→RH炉→连铸→轧制→淬火→回火→性能检验,其特征在于关键工艺步骤包括:
(1)转炉:出钢C控制在0.06%以上,P控制在0.015%以下,出钢温度1600~1620℃,出钢过程加入硅铁、金属锰合金以及铝铁脱氧和石灰、预熔渣;出钢完后喂入Al线,使钢水中Als含量在0.020~0.040%;
(2)LF炉:钢水进LF炉冶炼,加入石灰和预熔渣12~15kg/t钢水进行造渣,加入SiC和Al粒进行扩散脱氧,钢水中Als含量控制在0.02%~0.05%;将C、Si、Mn、S元素调整至要求范围后,白渣保持时间≥20min,出站前加入钛铁,将钢水Ti含量控制在0.04%以上,软吹大于等于5min,喂入钙线0.3~0.4kg/t钢水;
(3)RH炉:RH炉全程吹氩气,真空度在<67Pa下保持15min以上;破空后加入B铁,钢水B含量0.0010%~0.0020%,软吹≥15min;
(4)连铸:连铸全程保护浇铸,采用动态轻压下技术,中包过热度控制在6~13℃;连铸保护渣采用专用中碳保护渣,二冷比水量控制在0.33~0.37 L/kg;
(5)轧制:板坯温度控制在1240~1260℃,粗轧开轧温度≥1200℃,精轧开轧温度≥1050℃,轧制过程采用高温大压下快轧制,粗轧终轧阶段保证有至少一道次压下率大于20%,精轧后不打水,空冷至室温;
(6)淬火:淬火温度870~900℃,到达目标温度后保温10~15分钟,然后采用5bar压力淬火水冷;
(7)回火:淬火后钢板400~500℃装炉回火,到达目标温度后保温10~15分钟,然后空冷。
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