CN114480987A - 一种含稀土的nm600耐磨钢板及其制备方法 - Google Patents
一种含稀土的nm600耐磨钢板及其制备方法 Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
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- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
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- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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- C21D2211/00—Microstructure comprising significant phases
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Abstract
本发明公开了一种含稀土的NM600耐磨钢板及其制备方法,涉及钢铁生产技术领域,其化学成分及质量百分比如下:C:0.21%‑0.63%,Mn:0.20%‑1.00%,Si:0.10%‑0.30%,Cr:0.15%‑0.85%,Mo:0.08%‑0.75%,Ni:0.70%‑2.00%,Nb:0.010%‑0.060%,V:0.010%‑0.060%,Ti:0.010%‑0.040%,Alt:0.020%‑0.080%,B:0.0008%‑0.0030%,Ce:0.0005%‑0.0080%,P≤0.010%,S≤0.0020%,O≤0.0020%,N≤0.0040%,余量为铁和不可避免的杂质。通过在低合金高强度耐磨钢中加入稀土合金,在不降低钢板硬度和强度的前提下有效改善了低温冲击韧性和塑性。
Description
技术领域
本发明涉及钢铁生产技术领域,特别是涉及一种含稀土的NM600耐磨钢板及其制备方法。
背景技术
磨损是机械零件失效的主要形式之一,磨损导致的使用失效加大了工件的维修和更换频率,大幅度降低了生产效率,产生相当惊人的经济损失,甚至会造成设备与人身事故。随着现代工业的高速发展,机械设备的运转速度越来越高,受摩擦工件被磨损的速度也越来越快,磨损造成的机械零件失效也变得越来越突出。近些年,我国低合金高强度耐磨钢的研究和开发取得了很大的进步,开发出的低合金耐磨钢牌号和等级不断提高,目前已开发出以布氏硬度(HB)划分的NM360、NM400、NM450、NM500等系列低合金耐磨钢。硬度是衡量金属材料耐磨性的重要指标,硬度的提高通常会导致韧性和塑性的降低。如何制备具有更高的硬度和强度,同时保证优良的塑性和韧性的耐磨材料成为开发更高级别低合金耐磨钢的难点。
发明内容
本发明针对上述技术问题,克服现有技术的缺点,提供一种含稀土的NM600耐磨钢板,其化学成分及质量百分比如下:C:0.21%-0.63%,Mn:0.20%-1.00%,Si:0.10%-0.30%,Cr:0.15%-0.85%,Mo:0.08%-0.75%,Ni:0.70%-2.00%,Nb:0.010%-0.060%,V:0.010%-0.060%,Ti:0.010%-0.040%,Alt:0.020%-0.080%,B:0.0008%-0.0030%,Ce:0.0005%-0.0080%,P≤0.010%,S≤0.0020%,O≤0.0020%,N≤0.0040%,余量为铁和不可避免的杂质。
本发明进一步限定的技术方案是:
前所述的一种含稀土的NM600耐磨钢板,其化学成分及质量百分比如下:C:0.38%-0.40%,Mn:0.40%-0.50%,Si:0.20%-0.30%,Cr:0.20%-0.30%,Mo:0.10%-0.20%,Ni:1.00%-1.20%,Nb:0.010%-0.040%,V:0.010%-0.040%,Ti:0.010%-0.040%,Alt:0.020%-0.050%,B:0.0008%-0.0030%,Ce:0.0010%-0.0030%,P≤0.010%,S≤0.0020%,O≤0.0020%,N≤0.0040%,余量为铁和不可避免的杂质。
前所述的一种含稀土的NM600耐磨钢板,其化学成分及质量百分比如下:C:0.41%-0.43%,Mn:0.50%-0.60%,Si:0.30%-0.40%,Cr:0.35%-0.45%,Mo:0.20%-0.30%,Ni:1.2%-1.4%,Nb:0.010%-0.040%,V:0.010%-0.040%,Ti:0.010%-0.040%,Alt:0.020%-0.080%,B:0.0008%-0.0030%,Ce:0.0030%-0.0050%,P≤0.008%,S≤0.0015%,O≤0.0018%,N≤0.0035%,余量为铁和不可避免的杂质。
本发明的另一目的在于提供一种含稀土的NM600耐磨钢板制备方法,包括以下步骤:
(1)铁水预处理
KR法或喷吹法进行铁水预处理脱硫,铁水预处理后扒渣,保证铁水中S≤0.0020%;
(2)转炉冶炼
采用顶底复吹转炉进行铁水脱碳、脱硅、脱硫,出钢温度控制在1620-1660℃;转炉出钢后加铝脱氧,钢液中全氧≤0.0500%;出钢过程加入石灰6.4±0.3kg/t钢和预熔精炼渣2.3±0.3kg/t钢;
(3)LF精炼
根据渣况适当补充石灰和石英砂,碱度控制在4.5-6.5;采用铝粒、铝粉或铝丝脱氧,钢液中全氧≤0.0020%,溶解氧≤0.0005%;
(4)RH精炼
高真空度保持时间≥25min;RH结束后,加入硼铁或喂入硼丝后,静搅时间≥15min;
(5)连铸
连铸长水口和浸入式水口实行严格的氩封,拉速控制在0.70-0.80m/min,中间包采用无碳覆盖剂,浇铸采用高碳钢保护渣;
(6)轧制
连铸坯料150℃以上带温入炉,冷坯采用下铺上盖方式捂热或台式炉预热;加热温度1220±20℃,轧制采用两阶段控轧,第一阶段轧后待温至≤920℃,目标终轧温度≥800℃,轧后空冷;两阶段累积压下率分别≥40%和≥50%;
(7)热处理
淬火加热温度为840~950℃,在炉时间23~55min;回火加热温度为210~280℃,在炉时间65~155min。
前所述的一种含稀土的NM600耐磨钢板制备方法,步骤(4),真空度≤3.0mbar,真空处理前利用底吹氩气吹开渣层后加入铈铁合金,或真空处理10-20min通过料仓加入铈铁合金,或真空处理结束后利用底吹氩气吹开渣层后加入铈铁合金。
前所述的一种含稀土的NM600耐磨钢板制备方法,钢板厚度为12-30mm。
前所述的一种含稀土的NM600耐磨钢板制备方法,钢板金相组织为针状马氏体。
本发明的有益效果是:
(1)本发明在钢液精炼过程中加入稀土合金,利用稀土进行钢液中夹杂物的变质改性,同时配合科学合理的轧制及热处理制度实现钢板晶粒的细化,从而达到改善塑性和冲击韧性的目的;
(2)本发明中LF精炼渣碱度控制在4.5-6.5,使精炼渣保持较好的流动性和对夹杂物的吸附能力,尽量减少钢中的夹杂物数量;
(3)本发明中RH高真空度保持时间≥25min,以此来降低钢水中的H含量,使夹杂物碰撞长大上浮,减少夹杂物的数量,提高钢水的纯净度;
(4)本发明中连铸长水口和浸入式水口实行严格的氩封,以此避免钢水的二次污染,减少外来夹杂物的产生;
(5)本发明中轧制采用两阶段控轧,第一阶段轧后待温至≤920℃,目标终轧温度≥800℃,以此细化钢板原始晶粒度,提高钢板的冲击韧性。
具体实施方式
实施例1
本实施例提供的一种含稀土的NM600耐磨钢板制备方法,具体步骤如下:
利用KR法进行铁水预处理脱硫,扒渣,预处理后铁水中S的质量分数为0.0016%。采用顶底复吹转炉进行铁水脱碳、脱硅、脱硫,出钢温度为1646℃。转炉出钢后加铝脱氧,钢液中全氧的质量分数为0.0470%。出钢过程加入石灰6.4±0.3kg/t钢和预熔精炼渣2.3±0.3kg/t钢。LF精炼过程碱度控制在5.4,采用铝粒脱氧,LF出站钢液中全氧的质量分数为0.0020%,溶解氧的质量分数为0.0005%。RH精炼过程真空处理前利用底吹氩气吹开渣层后加入铈铁合金,高真空度(≤3.0mbar)保持时间为26min,RH结束后加入硼铁,静搅时间18min。连铸长水口和浸入式水口实行严格的氩封,拉速控制在0.70-0.80m/min,中间包采用无碳覆盖剂,浇铸采用高碳钢保护渣。连铸坯料150℃带温入炉,冷坯采用下铺上盖方式捂热或台式炉预热。加热温度1220±20℃,轧制采用两阶段控轧,第一阶段轧后待温至860℃,目标终轧温度800℃,轧后空冷。两阶段累积压下率分别为60%和70%。热处理淬火加热温度为840℃,在炉时间23min;回火加热温度为210℃,在炉时间65min。
钢板化学成分见表1,采用国标测试方法测得钢板的力学性能见表2。
实施例2
本实施例提供的一种含稀土的NM600耐磨钢板制备方法,具体步骤如下:
利用喷吹法进行铁水预处理脱硫,扒渣,预处理后铁水中S的质量分数为0.0019%。采用顶底复吹转炉进行铁水脱碳、脱硅、脱硫,出钢温度为1628℃。转炉出钢后加铝脱氧,钢液中全氧的质量分数为0.0420%。出钢过程加入石灰6.4±0.3kg/t钢和预熔精炼渣2.3±0.3kg/t钢。LF精炼过程碱度控制在6.5,采用铝粉脱氧,LF出站钢液中全氧的质量分数为0.0018%,溶解氧的质量分数为0.0003%。RH精炼过程高真空度(≤3.0mbar)保持时间为28min,真空处理17min通过料仓加入铈铁合金,RH结束后加入硼铁,静搅时间17min。连铸长水口和浸入式水口实行严格的氩封,拉速控制在0.70-0.80m/min,中间包采用无碳覆盖剂,浇铸采用高碳钢保护渣。连铸坯料160℃带温入炉,冷坯采用下铺上盖方式捂热或台式炉预热。加热温度1220±20℃,轧制采用两阶段控轧,第一阶段轧后待温至880℃,目标终轧温度810℃,轧后空冷。两阶段累积压下率分别为60%和70%。热处理淬火加热温度为890℃,在炉时间47min;回火加热温度为240℃,在炉时间98min。
钢板化学成分见表1,采用国标测试方法测得钢板的力学性能见表2。
实施例3
本实施例提供的一种含稀土的NM600耐磨钢板制备方法,具体步骤如下:
利用KR法进行铁水预处理脱硫,扒渣,预处理后铁水中S的质量分数为0.0017%。采用顶底复吹转炉进行铁水脱碳、脱硅、脱硫,出钢温度为1660℃。转炉出钢后加铝脱氧,钢液中全氧的质量分数为0.0480%。出钢过程加入石灰6.4±0.3kg/t钢和预熔精炼渣2.3±0.3kg/t钢。LF精炼过程碱度控制在4.5,采用铝丝脱氧,LF出站钢液中全氧的质量分数为0.0017%,溶解氧的质量分数为0.0003%。RH精炼过程高真空度(≤3.0mbar)保持时间为25min,真空处理结束后利用底吹氩气吹开渣层后加入铈铁合金,RH结束后加入硼铁,静搅时间20min。连铸长水口和浸入式水口实行严格的氩封,拉速控制在0.70-0.80m/min,中间包采用无碳覆盖剂,浇铸采用高碳钢保护渣。连铸坯料150℃带温入炉,冷坯采用下铺上盖方式捂热或台式炉预热。加热温度1220±20℃,轧制采用两阶段控轧,第一阶段轧后待温至920℃,目标终轧温度830℃,轧后空冷。两阶段累积压下率分别为40%和50%。热处理淬火加热温度为950℃,在炉时间55min;回火加热温度为280℃,在炉时间155min。制备所得钢板成分见表1,采用国标测试方法测得钢板的力学性能见表2。
钢板化学成分见表1,采用国标测试方法测得钢板的力学性能见表2。
表1实施例1-3钢板成分
表2实施例1-3钢板力学性能
通过以上实施例可以看出,本发明所制备的厚度为12-30mm的含稀土NM600耐磨钢板的抗拉强度≥1800MPa,屈服强度≥1550MPa,延伸率≥13.0%,表面硬度≥580HB,-20℃冲击≥21J。相同厚度(12mm)条件下,随着钢板中稀土含量的增大,断后伸长率和-20℃冲击功明显改善,韧塑性增强,同时强度和硬度指标并未下降。钢板厚度增大时,强度、硬度和韧塑性指标也可维持在相当水平。
除上述实施例外,本发明还可以有其他实施方式。凡采用等同替换或等效变换形成的技术方案,均落在本发明要求的保护范围。
Claims (7)
1.一种含稀土的NM600耐磨钢板,其特征在于:其化学成分及质量百分比如下:C:0.21%-0.63%,Mn:0.20%-1.00%,Si:0.10%-0.30%,Cr:0.15%-0.85%,Mo:0.08%-0.75%,Ni:0.70%-2.00%,Nb:0.010%-0.060%,V:0.010%-0.060%,Ti:0.010%-0.040%,Alt:0.020%-0.080%,B:0.0008%-0.0030%,Ce:0.0005%-0.0080%,P≤0.010%,S≤0.0020%,O≤0.0020%,N≤0.0040%,余量为铁和不可避免的杂质。
2.根据权利要求1所述的一种含稀土的NM600耐磨钢板,其特征在于:其化学成分及质量百分比如下:C:0.38%-0.40%,Mn:0.40%-0.50%,Si:0.20%-0.30%,Cr:0.20%-0.30%,Mo:0.10%-0.20%,Ni:1.00%-1.20%,Nb:0.010%-0.040%,V:0.010%-0.040%,Ti:0.010%-0.040%,Alt:0.020%-0.050%,B:0.0008%-0.0030%,Ce:0.0010%-0.0030%,P≤0.010%,S≤0.0020%,O≤0.0020%,N≤0.0040%,余量为铁和不可避免的杂质。
3.根据权利要求1所述的一种含稀土的NM600耐磨钢板,其特征在于:其化学成分及质量百分比如下:C:0.41%-0.43%,Mn:0.50%-0.60%,Si:0.30%-0.40%,Cr:0.35%-0.45%,Mo:0.20%-0.30%,Ni:1.2%-1.4%,Nb:0.010%-0.040%,V:0.010%-0.040%,Ti:0.010%-0.040%,Alt:0.020%-0.080%,B:0.0008%-0.0030%,Ce:0.0030%-0.0050%,P≤0.008%,S≤0.0015%,O≤0.0018%,N≤0.0035%,余量为铁和不可避免的杂质。
4. 根据权利要求1所述的一种含稀土的NM600耐磨钢板制备方法,其特征在于:应用于权利要求1-3任意一项,包括以下步骤:
(1)铁水预处理
KR法或喷吹法进行铁水预处理脱硫,铁水预处理后扒渣,保证铁水中S≤0.0020%;
(2)转炉冶炼
采用顶底复吹转炉进行铁水脱碳、脱硅、脱硫,出钢温度控制在1620-1660℃;转炉出钢后加铝脱氧,钢液中全氧≤0.0500%;出钢过程加入石灰6.4±0.3kg/t钢和预熔精炼渣2.3±0.3kg/t钢;
(3)LF精炼
根据渣况适当补充石灰和石英砂,碱度控制在4.5-6.5;采用铝粒、铝粉或铝丝脱氧,钢液中全氧≤0.0020%,溶解氧≤0.0005%;
(4)RH精炼
高真空度保持时间≥25min;RH结束后,加入硼铁或喂入硼丝后,静搅时间≥15min;
(5)连铸
连铸长水口和浸入式水口实行严格的氩封,拉速控制在0.70-0.80m/min,中间包采用无碳覆盖剂,浇铸采用高碳钢保护渣;
(6)轧制
连铸坯料150℃以上带温入炉,冷坯采用下铺上盖方式捂热或台式炉预热;加热温度1220±20℃,轧制采用两阶段控轧,第一阶段轧后待温至≤920℃,目标终轧温度≥800℃,轧后空冷;两阶段累积压下率分别≥40%和≥50%;
(7)热处理
淬火加热温度为840~950℃,在炉时间23~55min;回火加热温度为210~280℃,在炉时间65~155min。
5.根据权利要求4所述的一种含稀土的NM600耐磨钢板制备方法,其特征在于:所述步骤(4),真空度≤3.0mbar,真空处理前利用底吹氩气吹开渣层后加入铈铁合金,或真空处理10-20min通过料仓加入铈铁合金,或真空处理结束后利用底吹氩气吹开渣层后加入铈铁合金。
6.根据权利要求4所述的一种含稀土的NM600耐磨钢板制备方法,其特征在于:钢板厚度为12-30mm。
7.根据权利要求4所述的一种含稀土的NM600耐磨钢板制备方法,其特征在于:钢板金相组织为针状马氏体。
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