CN110106321A - 一种改善低温性能的加氢筒体用sa336f11 cl3钢及其热处理工艺 - Google Patents
一种改善低温性能的加氢筒体用sa336f11 cl3钢及其热处理工艺 Download PDFInfo
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Abstract
一种改善低温性能的加氢筒体用SA336F11 CL3钢及其热处理工艺,对SA336F11 CL3钢中多种元素的含量进行合理控制,并在SA336F11 CL3钢中添加了Al、Ni、Nb等有益元素,使SA336F11 CL3钢在温度低至零度以下等低温工作情况下的性能得到提升,能够有效避免SA336F11 CL3钢在低温时出现低温冲击及韧性指标偏低的问题,并且还提供了能够保证SA336F11 CL3钢低温性能的热处理工艺,能够提升加氢筒体锻件的性能,消除加氢筒体寿命降低等隐患,利于推广运用。
Description
技术领域
本发明涉及加氢筒体用合金钢领域,尤其涉及一种改善低温性能的加氢筒体用SA336F11 CL3钢及其热处理工艺。
背景技术
随着国内外压力容器向超大规格、超大壁厚市场的发展,加氢筒体等压力容器的主体材料机械性能指标要求也在不断提高,不仅要求具有高的强度,还逐渐提高了对低温性能指标的要求;SA336F11 CL3钢属于低碳合金钢,指的是符合ASEM SA-336/SA-336M《高温承压件用合金钢锻件》标准中的3类合金钢,已在加氢筒体等压力容器中得到广泛应用,但是SA336F11 CL3钢所制成的加氢筒体的使用过程中,在温度低至零度以下等低温工作的情况下,容易出现低温冲击及韧性指标偏低的现象,影响加氢筒体锻件的性能,并且会造成加氢筒体寿命降低等多种隐患。
发明内容
为解决现有的SA336F11 CL3钢低温性能不足的问题,本发明提供了一种改善低温性能的加氢筒体用SA336F11 CL3钢及其热处理工艺。
本发明为解决上述技术问题所采用的技术方案是:一种改善低温性能的加氢筒体用SA336F11 CL3钢,所述的SA336F11 CL3钢的化学成分按重量百分比包括:0.13-0.15%的C,0.50-0.60%的Si,0.60-0.68%的Mn,1.40-1.50%的Cr,0.15-0.20%的Ni,0.55-0.65%的Mo,0.030-0.040%的Nb,0.015-0.025%的Al,≤0.025%的P,并控制以下元素的含量:S≤0.025%,As≤0.010%,Sn≤0.010%,Sb≤0.003%,Cu≤0.20%,H≤0.0002%,O≤0.0020%,N≤0.008%,余量为Fe及杂质。
优选的,所述的SA336F11 CL3钢的化学成分按重量百分比包括:0.14%的C,0.56%的Si,0.62%的Mn,1.44%的Cr,0.16%的Ni,0.58%的Mo,0.038%的Nb,0.025%的Al,0.0047%的P,0.0008%的S,0.0069%的As,0.0019%的Sn,0.0024%的Sb,0.037%的Cu,0.00017%的H,0.0017%的O,0.0064%的N,余量为Fe及杂质。
优选的,所述的SA336F11 CL3钢的化学成分按重量百分比包括:0.14%的C,0.54%的Si,0.60%的Mn,1.46%的Cr,0.16%的Ni,0.58%的Mo,0.042%的Nb,0.022%的Al,0.0052%的P,0.001%的S,0.0075%的As,0.0013%的Sn,0.0020%的Sb,0.035%的Cu,0.00012%的H,0.0015%的O,0.0060%的N,余量为Fe及杂质。
本发明的SA336F11 CL3钢的各化学成分含量均符合ASEM SA-336/SA-336M《高温承压件用合金钢锻件》标准中所规定的含量,其中,Si元素会阻滞锻件内部组织的贝氏体转变,并且会与P元素配合作用而促进P在钢中的脆化,导致锻件的韧性下降,所以对Si的含量按照《高温承压件用合金钢锻件》标准中的下限进行控制;Ni元素具有提高钢的淬透性及提高钢的低温韧性的效应,所以控制钢中含有适量的Ni;Mo元素能提高钢的淬透性,并且能减轻钢的回火脆性,所以Mo的含量按照《高温承压件用合金钢锻件》标准中的上限进行控制;Nb元素对于C元素具有极高的亲和力,使钢中形成稳定的碳化物,起到细化晶粒提高韧性的作用,但如果Nb含量过高则会使钢加重偏析并产生较多液析碳化物,所以控制钢中含有适量的Nb; Al元素能细化钢的晶粒,提高钢的强度,并且,Al能够与钢中的N结合形成AlN并在钢中起到钉扎位错的作用,可有效的增强钢在低温时的韧性等性能;对于钢中的有害元素As、Sn、Sb、Cu,以及气体元素H、O、N,本发明均对其含量进行了限制,并且根据限制后钢中的N元素含量,控制Al元素的含量在适当的范围,从而既保证了Al元素和AlN对钢低温性能的增强作用,也避免了钢中N含量过高而影响钢的性能。
本发明还提供了一种改善低温性能的加氢筒体用SA336F11 CL3钢的热处理工艺,包括以下步骤:
一、预备热处理
步骤1、将SA336F11 CL3钢锻件加热至600-650℃,保温3-6h;
步骤2、将步骤1保温后的锻件以≤60℃/h的升温速率加热至900-940℃并保温,保温时间(h)=(1.5~2.5)×锻件壁厚(mm)/100;
步骤3、将步骤2保温后的锻件空冷至280-320℃,保温6-10h;
步骤4、将步骤3保温后的锻件以≤60℃/h的升温速率加热至840-900℃并保温,保温时间(h)=(3~4)×锻件壁厚(mm)/100,然后空冷至280℃以下;
步骤5、将步骤4空冷后的锻件以≤60℃/h的升温速率加热至640-660℃并保温12-18h,然后空冷至室温;
二、快速冷却式正火处理
对预备热处理后的SA336F11 CL3钢锻件进行加工以去除表面黑皮,然后将锻件加热至300-350℃并保温3-6h,再以≤80℃/h的升温速率加热至600-650℃并保温4-8h,再加热至900-940℃并保温6-10h,出炉水冷至表面温度低于60℃,水冷过程中控制水温不超过25℃,然后锻件出水并空冷至室温;
三、最终回火处理
将出水并空冷至室温的锻件加热至300-350℃并保温3-6h,再以≤50℃/h的升温速率加热至680-720℃并保温10-14h,空冷至室温,即完成SA336F11 CL3钢锻件的热处理。
本发明中先对SA336F11 CL3钢锻件进行预备热处理,具体为先对锻件进行预热,然后对锻件先后进行了两次正火+回火的组合处理,其中第一次正火将锻件加热至900-940℃,采用了较高的奥氏体化温度,目的是打断原始晶粒与新形核晶粒之间的相互关系,使锻件中重新结晶奥氏体均匀化;第二次正火将锻件加热至840-900℃,采用了较低的奥氏体化温度,目的是在锻件中获得较细的晶粒;再通过回火使锻件内部组织转变为相对稳定状态,降低硬度便于切削加工;然后本发明对锻件进行了快速冷却式正火处理,在对锻件进行正火后,通过水冷方式并控制水温不超过25℃,从而保证了对锻件进行水冷的速度,使锻件快速降温冷却,以防止锻件内在高温状态下析出铁素体,再对锻件进行最终回火处理,全面提升锻件的内部组织性能,即可获得改善低温性能的加氢筒体用SA336F11 CL3钢锻件。
根据上述技术方案,本发明的有益效果是:
本发明提供的一种改善低温性能的加氢筒体用SA336F11 CL3钢,通过对SA336F11 CL3钢中多种元素的含量进行合理控制,并在SA336F11 CL3钢中添加了Al、Ni、Nb等有益元素,使SA336F11 CL3钢在温度低至零度以下等低温工作情况下的性能得到提升,能够有效避免SA336F11 CL3钢在低温时出现低温冲击及韧性指标偏低的问题,并且还提供了能够保证SA336F11 CL3钢低温性能的热处理工艺,所以本发明能够提升加氢筒体锻件的性能,消除加氢筒体寿命降低等隐患,利于推广运用。
具体实施方式
实施例1:一种改善低温性能的加氢筒体用SA336F11 CL3钢,其化学成分按重量百分比包括:0.14%的C,0.56%的Si,0.62%的Mn,1.44%的Cr,0.16%的Ni,0.58%的Mo,0.038%的Nb,0.025%的Al,0.0047%的P,0.0008%的S,0.0069%的As,0.0019%的Sn,0.0024%的Sb,0.037%的Cu,0.00017%的H,0.0017%的O,0.0064%的N,余量为Fe及杂质。
实施例2:一种改善低温性能的加氢筒体用SA336F11 CL3钢,其化学成分按重量百分比包括:0.14%的C,0.54%的Si,0.60%的Mn,1.46%的Cr,0.16%的Ni,0.58%的Mo,0.042%的Nb,0.022%的Al,0.0052%的P,0.001%的S,0.0075%的As,0.0013%的Sn,0.0020%的Sb,0.035%的Cu,0.00012%的H,0.0015%的O,0.0060%的N,余量为Fe及杂质。
对采用实施例1及实施例2的SA336F11 CL3钢制成的加氢筒体锻件采用相同的热处理工艺,具体步骤如下:
一、预备热处理
步骤1、将加氢筒体锻件加热至600-650℃,保温4h;
步骤2、将步骤1保温后的锻件以≤60℃/h的升温速率加热至930℃并保温,保温时间(h)=2×锻件壁厚(mm)/100;
步骤3、将步骤2保温后的锻件空冷至280-320℃,保温8h;
步骤4、将步骤3保温后的锻件以≤60℃/h的升温速率加热至880℃并保温,保温时间(h)=4×锻件壁厚(mm)/100,然后空冷至280℃以下;
步骤5、将步骤4空冷后的锻件以≤60℃/h的升温速率加热至650℃并保温15h,然后空冷至室温;
二、快速冷却式正火处理
对预备热处理后的SA336F11 CL3钢锻件进行加工以去除表面黑皮,然后将锻件加热至350℃并保温4h,再以≤80℃/h的升温速率加热至650±10℃并保温6h,再加热至915℃并保温8h,出炉采用快速冷却式水冷至表面温度低于60℃,水冷过程中控制水温不超过25℃,然后锻件出水并空冷至室温;
三、最终回火处理
将出水并空冷至室温的锻件加热至350℃并保温4h,再以≤50℃/h的升温速率加热至690±10℃并保温10h,空冷至室温,即完成SA336F11 CL3钢锻件的热处理,得到增强了低温性能的SA336F11 CL3钢加氢筒体锻件,性能如下表所示,可知实施例1及实施例2制成的锻件均具有优异的性能,能够满足加氢筒体的使用要求。
Claims (4)
1.一种改善低温性能的加氢筒体用SA336F11 CL3钢,其特征在于:所述的SA336F11CL3钢的化学成分按重量百分比包括:0.13-0.15%的C,0.50-0.60%的Si,0.60-0.68%的Mn,1.40-1.50%的Cr,0.15-0.20%的Ni,0.55-0.65%的Mo,0.030-0.040%的Nb,0.015-0.025%的Al,≤0.025%的P,并控制以下元素的含量:S≤0.025%,As≤0.010%,Sn≤0.010%,Sb≤0.003%,Cu≤0.20%,H≤0.0002%,O≤0.0020%,N≤0.008%,余量为Fe及杂质。
2.根据权利要求1所述的一种改善低温性能的加氢筒体用SA336F11 CL3钢,其特征在于:所述的SA336F11 CL3钢的化学成分按重量百分比包括:0.14%的C,0.56%的Si,0.62%的Mn,1.44%的Cr,0.16%的Ni,0.58%的Mo,0.038%的Nb,0.025%的Al,0.0047%的P,0.0008%的S,0.0069%的As,0.0019%的Sn,0.0024%的Sb,0.037%的Cu,0.00017%的H,0.0017%的O,0.0064%的N,余量为Fe及杂质。
3.根据权利要求1所述的一种改善低温性能的加氢筒体用SA336F11 CL3钢,其特征在于:所述的SA336F11 CL3钢的化学成分按重量百分比包括:0.14%的C,0.54%的Si,0.60%的Mn,1.46%的Cr,0.16%的Ni,0.58%的Mo,0.042%的Nb,0.022%的Al,0.0052%的P,0.001%的S,0.0075%的As,0.0013%的Sn,0.0020%的Sb,0.035%的Cu,0.00012%的H,0.0015%的O,0.0060%的N,余量为Fe及杂质。
4.根据权利要求1所述的一种改善低温性能的加氢筒体用SA336F11 CL3钢的热处理工艺,其特征在于,包括以下步骤:
一、预备热处理
步骤1、将SA336F11 CL3钢锻件加热至600-650℃,保温3-6h;
步骤2、将步骤1保温后的锻件以≤60℃/h的升温速率加热至900-940℃并保温,保温时间(h)=(1.5~2.5)×锻件壁厚(mm)/100;
步骤3、将步骤2保温后的锻件空冷至280-320℃,保温6-10h;
步骤4、将步骤3保温后的锻件以≤60℃/h的升温速率加热至840-900℃并保温,保温时间(h)=(3~4)×锻件壁厚(mm)/100,然后空冷至280℃以下;
步骤5、将步骤4空冷后的锻件以≤60℃/h的升温速率加热至640-660℃并保温12-18h,然后空冷至室温;
二、快速冷却式正火处理
对预备热处理后的SA336F11 CL3钢锻件进行加工以去除表面黑皮,然后将锻件加热至300-350℃并保温3-6h,再以≤80℃/h的升温速率加热至600-650℃并保温4-8h,再加热至900-940℃并保温6-10h,出炉水冷至表面温度低于60℃,水冷过程中控制水温不超过25℃,然后锻件出水并空冷至室温;
三、最终回火处理
将出水并空冷至室温的锻件加热至300-350℃并保温3-6h,再以≤50℃/h的升温速率加热至680-720℃并保温10-14h,空冷至室温,即完成SA336F11 CL3钢锻件的热处理。
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