CN114686755A - 一种大口径高强度bj890起重机臂架用无缝钢管及其中频热处理方法 - Google Patents
一种大口径高强度bj890起重机臂架用无缝钢管及其中频热处理方法 Download PDFInfo
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- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 6
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- 238000005275 alloying Methods 0.000 description 2
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- 229910052757 nitrogen Inorganic materials 0.000 description 2
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- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 description 1
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Abstract
本发明涉及一种大口径高强度BJ890起重机臂架用无缝钢管及其中频热处理方法。所述的大口径无缝钢管其组分和各组分所占的质量百分比为:C:0.15~0.18%,Si:0.20~0.50%,Mn:1.3~1.5%,P≤0.020%,S≤0.010%,V:0.05~0.08%,Nb:0.035~0.055%,Ni≤0.40%,Cu≤0.15~0.35%,Mo:0.20~0.40%,Cr:0.70~0.90%,Al:0.020~0.050%,Al/N≥2,其余为Fe和微量杂质元素。包括下述步骤:1)冶炼;2)轧制;3)成品钢管热处理采用中频热处理。本发明提高材料的强度和韧性,使钢管具有较高的综合力学性能,满足BJ890起重机臂架用无缝钢管的要求。
Description
技术领域
本发明涉及一种无缝钢管及其中频加热方法,尤其涉及一种大口径高强度BJ890起重机臂架用无缝钢管及其中频热处理方法。
背景技术
近年来,我国履带式起重机发展迅速,尤其是大吨位履带式起重机的崛起,对材料的性能提出更高的要求。起重机臂架是履带式起重机承载和移送、起吊重物的关键部件,不仅要具有高强度、高塑性和良好的韧性,还必须具有良好的焊接性能,并且规格多,质量要求高。这类高强度无缝钢管属于低碳高强度钢,是通过添加微合金化元素,及少量合金元素,再经过合理的调质处理得到回火索氏体组织,有效地发挥微合金化元素的细化晶粒及回火过程中析出强化作用,从而提高材料的强度和韧性,使钢具有较高的综合力学性能。
发明内容
本发明的目的在于提供一种大口径高强度BJ890起重机臂架用无缝钢管及其中频热处理方法,以解决现有技术中的问题。
本发明的技术方案是:一种大口径高强度BJ890起重机臂架用无缝钢管,所述的大口径无缝钢管其组分和各组分所占的质量百分比为:C:0.15~0.18%,Si:0.20~0.50%,Mn:1.3~1.5%,P≤0.020%,S≤0.010%,V:0.05~0.08%,Nb:0.035~0.055%,Ni≤0.40%,Cu≤0.15~0.35%,Mo:0.20~0.40%,Cr:0.70~0.90%,Al:0.020~0.050%,Al/N≥2,其余为Fe和微量杂质元素。
所述的大口径无缝钢管为外径219mm~762mm、壁厚8mm~40mm的起重机臂架用无缝钢管。
所述的大口径无缝钢管屈服强度≥890Mpa,抗拉强度≥960Mpa,延伸率≥14%,-20°C冲击功≥35J。
一种大口径高强度BJ890起重机臂架用无缝钢管的中频热处理方法,包括下述步骤:
1)冶炼,将上述钢种组成元素重量成分配料冶炼,喂入钙丝控制夹杂物形态,后进行连铸,连铸过程中采用电磁搅拌和气体保护;
2)轧制,管坯轧制成外径219mm~762mm,壁厚8mm~40mm热轧钢管;
3)成品钢管热处理采用中频热处理,淬火温度940±10℃,接着水淬,回火温度500°C~650°C,空冷至室温。
所述的冶炼步骤中气体含量0≤40PPm,N≤80PPm,H≤2.5PPm,并控制A、B、C、D和DS类夹杂不大于1.5级,且单系和不大于4.5级。
本发明的有益效果是:通过对低碳高强度钢,添加微合金化元素,少量合金元素,经过轧制,以及成品钢管中频淬火、回火得到回火索氏体组织,有效地发挥微合金化元素的细化晶粒、中频快速加热的细化晶粒及回火过程中合金析出强化作用,从而提高材料的强度和韧性,使钢管具有较高的综合力学性能,满足BJ890起重机臂架用无缝钢管的要求。
具体实施方式
实施例1
一种大口径高强度BJ890起重机臂架用无缝钢管,所述的大口径无缝钢管其组分和各组分所占的质量百分比为:C:0.15%,Si:0.20%,Mn:1.3%,P≤0.020%,S≤0.010%,V:0.05%,Nb:0.035%,Ni≤0.40%,Cu≤0.15,Mo:0.20%,Cr:0.70%,Al:0.020%,Al/N≥2,其余为Fe和微量杂质元素。
所述的大口径无缝钢管为外径219mm~762mm、壁厚8mm~40mm的起重机臂架用无缝钢管。
所述的大口径无缝钢管屈服强度≥890Mpa,抗拉强度≥960Mpa,延伸率≥14%,-20°C冲击功≥35J。
一种大口径高强度BJ890起重机臂架用无缝钢管的中频热处理方法,包括下述步骤:
1)冶炼,将上述钢种组成元素重量成分配料冶炼,喂入钙丝控制夹杂物形态,后进行连铸,连铸过程中采用电磁搅拌和气体保护;
2)轧制,管坯轧制成外径219mm~762mm,壁厚8mm~40mm热轧钢管;
3)成品钢管热处理采用中频热处理,淬火温度930℃,接着水淬,回火温度550°C,空冷至室温。
所述的冶炼步骤中气体含量0≤40PPm,N≤80PPm,H≤2.5PPm,并控制A、B、C、D和DS类夹杂不大于1.5级,且单系和不大于4.5级。
实施例2
一种大口径高强度BJ890起重机臂架用无缝钢管,所述的大口径无缝钢管其组分和各组分所占的质量百分比为:C:0.17%,Si:0.4%,Mn:1.4%,P≤0.020%,S≤0.010%,V:0.06%,Nb:0.04%,Ni≤0.40%,Cu≤0.2%,Mo:0.3%,Cr:0.8%,Al:0.4%,Al/N≥2,其余为Fe和微量杂质元素。
所述的大口径无缝钢管为外径219mm~762mm、壁厚8mm~40mm的起重机臂架用无缝钢管。
所述的大口径无缝钢管屈服强度≥890Mpa,抗拉强度≥960Mpa,延伸率≥14%,-20°C冲击功≥35J。
一种大口径高强度BJ890起重机臂架用无缝钢管的中频热处理方法,包括下述步骤:
1)冶炼,将上述钢种组成元素重量成分配料冶炼,喂入钙丝控制夹杂物形态,后进行连铸,连铸过程中采用电磁搅拌和气体保护;
2)轧制,管坯轧制成外径219mm~762mm,壁厚8mm~40mm热轧钢管;
3)成品钢管热处理采用中频热处理,淬火温度940℃,接着水淬,回火温度600°C,空冷至室温。
所述的冶炼步骤中气体含量0≤40PPm,N≤80PPm,H≤2.5PPm,并控制A、B、C、D和DS类夹杂不大于1.5级,且单系和不大于4.5级。
实施例3
一种大口径高强度BJ890起重机臂架用无缝钢管,所述的大口径无缝钢管其组分和各组分所占的质量百分比为:C: 0.18%,Si: 0.50%,Mn: 1.5%,P≤0.020%,S≤0.010%,V:0.08%,Nb: 0.055%,Ni≤0.40%,Cu≤0.35%,Mo:0.40%,Cr:0.90%,Al:0.050%,Al/N≥2,其余为Fe和微量杂质元素。
所述的大口径无缝钢管为外径219mm~762mm、壁厚8mm~40mm的起重机臂架用无缝钢管。
所述的大口径无缝钢管屈服强度≥890Mpa,抗拉强度≥960Mpa,延伸率≥14%,-20°C冲击功≥35J。
一种大口径高强度BJ890起重机臂架用无缝钢管的中频热处理方法,包括下述步骤:
1)冶炼,将上述钢种组成元素重量成分配料冶炼,喂入钙丝控制夹杂物形态,后进行连铸,连铸过程中采用电磁搅拌和气体保护;
2)轧制,管坯轧制成外径219mm~762mm,壁厚8mm~40mm热轧钢管;
3)成品钢管热处理采用中频热处理,淬火温度950℃,接着水淬,回火温度650°C,空冷至室温。
所述的冶炼步骤中气体含量0≤40PPm,N≤80PPm,H≤2.5PPm,并控制A、B、C、D和DS类夹杂不大于1.5级,且单系和不大于4.5级。
本发明中材料各元素、轧制工艺以及中频热处理的作用及机理:
材料元素:
⑴C,Mn是最有效的固溶强化元素,C、Mn含量控制范围分别为:C:0.15~0.18%,Mn:1.3~1.5%;
⑵钢中S,P是有害杂质元素,钢中P,S含量越低越好;
⑶钢中Al的加入含量控制在0.020%~0.050%,且Al/N≥2;
⑷钒在轧制过程中应变诱导析出的V(C、N)可阻止形变奥氏体的再结晶,V的含量为0.05~0.08%;
⑸在钢中加入Nb,可以通过Nb(C、N)未溶质点及应变诱导析出抑制高温变形过程的再结晶,Nb含量控制在0.035~0.055%;
⑹Mo是钢的重要的合金元素,含量控制在0.20-0.40%;
⑺Cr是钢的淬透性合金元素,含量控制在0.70-0.90%;
⑻Cu含量控制在0.15-0.35%;
⑼控制钢种的夹杂物,进行钙处理,提高钢的纯净度,控制S≤0.010%,P≤0.020%,气体N≤80PPM,O≤40PPM,H≤2.5PPM。
轧制:轧制成外径219mm~762mm,壁厚8mm~40mm热轧钢管。
中频热处理:成品钢管热处理采用中频淬火+回火工艺,通过中频加热,进一步细化晶粒,实现成品钢管细化晶粒强化。
Claims (5)
1.一种大口径高强度BJ890起重机臂架用无缝钢管,其特征在于:所述的大口径无缝钢管其组分和各组分所占的质量百分比为:C:0.15~0.18%,Si:0.20~0.50%,Mn:1.3~1.5%,P≤0.020%,S≤0.010%,V:0.05~0.08%,Nb:0.035~0.055%,Ni≤0.40%,Cu≤0.15~0.35%,Mo:0.20~0.40%,Cr:0.70~0.90%,Al:0.020~0.050%,Al/N≥2,其余为Fe和微量杂质元素。
2.根据权利要求1所述的一种大口径高强度BJ890起重机臂架用无缝钢管,其特征在于:所述的大口径无缝钢管为外径219mm~762mm、壁厚8mm~40mm的起重机臂架用无缝钢管。
3.根据权利要求2所述的一种大口径高强度BJ890起重机臂架用无缝钢管,其特征在于:所述的大口径无缝钢管屈服强度≥890Mpa,抗拉强度≥960Mpa,延伸率≥14%,-20°C冲击功≥35J。
4.一种大口径高强度BJ890起重机臂架用无缝钢管的中频热处理方法,包括下述步骤,其特征在于:
1)冶炼,将上述钢种组成元素重量成分配料冶炼,喂入钙丝控制夹杂物形态,后进行连铸,连铸过程中采用电磁搅拌和气体保护;
2)轧制,管坯轧制成外径219mm~762mm,壁厚8mm~40mm热轧钢管;
3)成品钢管热处理采用中频热处理,淬火温度940±10℃,接着水淬,回火温度500°C~650°C,空冷至室温。
5.根据权利要求1所述的一种大口径高强度BJ890起重机臂架用无缝钢管的中频热处理方法,其特征在于:所述的冶炼步骤中气体含量0≤40PPm,N≤80PPm,H≤2.5PPm,并控制A、B、C、D和DS类夹杂不大于1.5级,且单系和不大于4.5级。
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CN105779897A (zh) * | 2014-12-23 | 2016-07-20 | 鞍钢股份有限公司 | 一种m65级电阻焊石油套管及其制造方法 |
CN109371204A (zh) * | 2018-12-22 | 2019-02-22 | 扬州龙川钢管有限公司 | 一种大口径高强度bj890起重机臂架用无缝钢管及其生产方法 |
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US20160186300A1 (en) * | 2013-08-26 | 2016-06-30 | Nippon Steel & Sumitomo Metal Corporation | Rolled round steel material for steering rack bar, and steering rack bar |
CN105779897A (zh) * | 2014-12-23 | 2016-07-20 | 鞍钢股份有限公司 | 一种m65级电阻焊石油套管及其制造方法 |
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