CN115216711A - 一种正火q345级压力容器用厚钢板及其生产方法 - Google Patents
一种正火q345级压力容器用厚钢板及其生产方法 Download PDFInfo
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Abstract
一种正火Q345级压力容器用厚钢板及其生产方法,钢的化学成分质量百分比为:C=0.12~0.15,Si=0.10~0.30,Mn=1.50~1.70,P≤0.012,S≤0.003,Alt=0.020~0.050,Nb=0.030~0.040,Cr=0.2~0.30,Ni=0.10~0.20,Cu=0.10~0.20,Ti≤0.005,N=0.006~0.0010,Ceq≤0.47%;其余为Fe和残留元素。采用工艺路线为:转炉冶炼→LF精炼→RH/VD真空精炼→连铸→板坯加热→控轧控冷→正火热处理。本发明钢组织为细小的珠光体+铁素体,钢板厚度80~150mm,焊后热处理的心部力学性能、产品表面、加工质量优良,板厚方向性能均匀,外检合格率100%,NB/T47013.3标准TI级探伤合格率100%。
Description
技术领域
本发明属于钢铁冶炼、轧制及热处理技术,涉及一种Q345级压力容器用厚钢板及其生产方法。
背景技术
随着社会经济的发展,压力容器不断向着大型化、规模化的方向发展,容器壁厚度也不断增加,大大地促进钢铁材料技术的迅速发展。
目前中国国标GB/T713中常用的Q345R厚板,性能检测位置为板厚1/4处冲击温度为0℃,无焊后热处理以及心部性能要求。但根据特殊低温压力容器的设计需求,常规板厚1/4处的力学性能以及0℃环境下的低温韧性已经难以满足设备的实际使用要求,同时考虑到压力容器的焊后消应以及多次焊补后消应的实际工况,因此经620℃长时间模焊后心部强度符合GB/T713标准,-40℃心部低温横向冲击≥41J的正火Q345级压力容器厚板在市场上具有广阔的应用前景。
CN110184531A公布了“一种40-60mm厚易焊接心部低温韧性优良的容器钢板及其制造方法”,该钢厚度仅为40~60mm且采用低C成分体系以及调质工艺生产。CN2022101501191公布了一种“提高大厚度Q345E钢低温韧性的方法及Q345E钢”,该钢采用TMCP工艺生产,性能检验依照标准要求为板厚1/4处且钢板厚度仅为80~100mm。CN2022101501191公布了一种“心部低温冲击韧性优异的厚规格Q345R钢板及制造方法”,但该钢厚度仅覆盖60~100mm。
发明内容
本发明旨在提供一种正火Q345级压力容器用厚钢板及其生产方法。采用大断面铸坯质量控制技术,通过微N低Ti的成分设计,配合高渗透性轧制及合理的热处理工艺,生产心部强度以及低温韧性优良的正火Q345级压力容器厚钢板。钢板厚度80~150mm,经620℃×12h焊后热处理的心部性能符合GB713标准要求 (80~100mm规格屈服强度≥305Mpa抗拉强度490~620Mpa;>100~150mm规格屈服强度≥285Mpa抗拉强度480~610Mpa),断后伸长率A≥20%,心部-40℃冲击吸收能量KV2≥41J,180°冷弯试验外表面无裂纹。
本发明的技术方案:
一种正火Q345级压力容器用厚钢板,生产的工艺路线为转炉冶炼→LF精炼→RH/VD真空精炼→连铸→板坯加热→控轧控冷→正火热处理。钢的化学成分质量百分比为C=0.12~0.15,Si=0.10~0.30,Mn=1.50~1.70,P≤0.012,S≤0.003,Alt=0.020~0.050,Nb=0.030~0.040,Cr=0.2~0.30,Ni=0.10~0.20,Cu=0.10~0.20,Ti≤0.005,N=0.006~0.0010,Ceq≤0.47%,其余为Fe和残留元素;钢板厚度80~150mm,组织为细小的珠光体+铁素体,晶粒度9.0~10.0级,经620℃×12h焊后热处理的心部强度80~100mm规格屈服强度≥305Mpa,抗拉强度490~620Mpa;>100~150mm规格屈服强度≥285Mpa,抗拉强度480~610Mpa,断后伸长率A≥20%,心部-40℃冲击吸收能量KV2≥41J,180°冷弯试验外表面无裂纹。
本发明还提供一种Q345级压力容器厚钢板的生产方法,工艺步骤包括:
(1)转炉炼钢:出钢C≥0.07%,P≤0.010%,出钢温度≥1580℃,出钢后进行炉后扒渣操作;
(2)LF精炼:钢水在LF炉总吹氩时间≥35min,白渣保持时间≥18min;钢水出LF前进行软吹氩操作,软吹氩时间>6min;
(3)RH精炼:RH炉真空度在0.5tor以下,保持时间≥12min;RH炉全程吹氮,氮气流量120m3/h,钢水温度1588~1612℃;破空后氩气软吹时间≥12min;
VD精炼:VD炉真空度在0.5tor以下,保持时间≥15min;VD炉破空后喂入氮线150~200米,喂入氮线速度为180~200米/min,喂线时钢水温度1575~1588℃;破空后氩气软吹时间≥12min;
(4)连铸:连铸采用断面为300/350/400/450mm,连铸实行全程保护浇铸,浇注温度按液相线温度+(5~13℃)控制,300mm断面采用动态轻压下技术,压下量≥7.0mm;350/400/450mm断面采用动态轻重压下技术,轻压下量≥7.0mm,重压下量≥14.0mm;
(5)板坯加热:板坯在步进炉中进行加热,温度控制在1180~1220℃;
(6)控制轧制:一阶段开轧温度980~1150℃,终轧温度>950℃,后三道次压下率≥14%;二阶段开轧温度在780~820℃,终轧温度740~780℃;
(7)控制冷却:钢板轧后进行加速冷却,冷速2~5℃/s,返红温度650~680℃;
(8)正火:加热温度860~880℃,保温时间为板厚mm×(1.0~1.5)min/mm。
(9)焊后热处理:加热温度620℃,保温时间为12h。
上述方法生产的钢板产品性能符合表1要求。
表1 钢板产品性能指标
本发明钢的化学成分设计原理:
C:碳元素在钢中常与其它合金元素形成碳化物,起固溶及析出强化作用,能有效提高强度并降低合金使用量,但从改善钢板低温韧性以及铸坯心部偏析方面,应尽量降低C含量。因此考虑到本钢的合金成分及性能要求,本发明钢的C含量控制在0.12~0.15%。
Si:有固溶强化作用,提高钢板屈服强度,但随着Si含量的增加低温韧性下降,同时降低未再结晶区温度,不利于晶粒细化。本发明钢的Si控制在0.10~0.30%范围。
Mn:是固溶强化元素同时细化晶粒,有利于钢板强韧性的提高,但容易出现中心偏聚现象以及形成MnS夹杂,影响心部冲击性能。
P:易偏析元素,增加回火脆性,尤其钢板经长时间消应处理后低温韧性会大幅下降。因此应该严格控制钢中磷的含量,本发明钢中的P控制在0.012%以下。
S:改善切削性,易形成MnS夹杂,产生热脆现象,影响焊接性能。本发明钢中的S控制在0.003%以内。
Nb:在钢中与氮、碳有极强的亲合力,可与之形成极稳定的Nb(C,N)化合物。沿奥氏体晶界弥散分布的Nb(C,N)粒子,可以大大提高原始奥氏体晶粒粗化温度,从而细化了铁素体晶粒,提高低温韧性和强度。
N:促进AlN、Nb(C、N)等析出物的生成,充分发挥了细晶强化和沉淀强化两种强化方式,细化厚板的心部晶粒。但过高的N含量将降低钢材的热塑性导致铸坯表面裂纹的出现,因此本发明钢将控制N=0.006%~0.0010%。
Cu:提高钢中奥氏体的稳定性,具有固溶强化作用能有效提高钢板的强度,同时具有较强的回火稳定性。
Ti:具有较强的固溶强化作用,可以细化晶粒,降低钢的过热倾向性。但本发明中Ti元素要求≤0.005%,主要减少TiN的中心析出改善冲击稳定性,同时提升AlN、Nb(C,N)等起钉扎作用的析出物含量,从而进一步细化厚板的轧态及正火态晶粒。
本发明根据对该钢的化学成分设计,严格控制各工序的生产工艺参数,通过微N低Ti的中碳成分设计,添加少量的Ni、Cu元素,辅以粗轧低速大压下以及未再结晶区控轧控冷+合理的正火工艺,钢板经620℃*12h焊后热处理的心部力学性能满足表1的要求,其组织为细小的珠光体+铁素体,晶粒度9.0~10.0级。
本发明具有以下优点:a.采用微氮、低Ti的中碳成分体系,合金生产成本低主要通过微合金元素进行细晶及析出强化,钢中添加Al、Nb微合金元素基础上,添加微量N元素同时控制Ti含量,减少TiN的中心析出改善心部冲击,促进AlN、Nb(C、N)等析出物形成,细化厚板心部晶粒提升钢材的强韧性,同时不会显著降低钢材的热塑性导致铸坯表面裂纹的出现。保证厚板心部为细小的珠光体+铁素体组织,经620℃×12h焊后热处理的性能满足表1要求;b.优良的铸坯心部偏析控制,利用大断面铸机先进的轻重动态压下结合5~13℃过热度控制技术,铸坯心部偏析稳定控制在C类1.0级及以下;c.设计合理的轧制工艺参数,坯料通过长时间的高温加热确保微合金元素的充分固溶,粗轧阶段采用高温大压下慢速轧制破碎原始奥氏体晶粒,单道次压下量40~50mm,II阶段低温控轧工艺利用轧制过程的诱变析出及轧后沉淀析出提高钢板强韧性;d.80~150mm厚板经正火后心部晶粒进一步细化,组织为均匀细小的铁素体+珠光体,晶粒度达到9.0~10.0级;e.通过对P、S有害元素以及CE的严格控制,改善钢板的回火脆性以及焊接性能等;f.采用正火工艺生产,钢板厚度方向性能均匀、板型及加工性能优良。
附图说明
图1这 实施例1钢的金相组织图。
图2为 实施例3钢的金相组织图。
具体实施方式
下面结合实施例对本发明做进一步说明。
实施例1:
炼钢工艺实施过程:转炉出钢C=0.08%,P=0.010%,出钢后进行扒渣操作。LF精炼白渣保持时间20min,钢水出LF前软吹氩时间8min;RH真空度0.3tor,保真空时间14min,氮气流量120m3/h,RH炉进站钢水温度1603℃,RH炉出站钢水温度1592℃。破空后软吹氩时间12min,定氢1.2ppm。连铸浇注断面厚度为300mm,连铸中间包钢水过热度6~11℃,动态轻压下8mm,熔炼成分如表2所示。
轧钢工艺实施过程:铸坯加热出钢温度1212℃,第一阶段开轧温度1050℃,最后三道次压下率分别为16%,19%,23%,终轧温度980℃,轧制中间坯厚度130mm。第二阶段开轧温度816℃,终轧温度772℃,轧制成品厚度80mm,钢板经正火(工艺:温度870℃,保温时间80min),焊后热处理(工艺:温度620℃,保温时间12h),其性能如表3所示,其金相组织如图1所示。
实施例2:
炼钢工艺实施过程:炼钢工艺实施过程:转炉出钢C=0.07%,P=0.008%,出钢后进行扒渣操作。LF精炼白渣保持时间22min,钢水出LF前软吹氩时间10min;VD真空度0.3tor,保真空时间18min,破空后喂入氮线180米,喂入氮线速度为195米/min,喂线开始时钢水温度1582℃,喂线结束时钢水温度1578℃。破空后软吹氩时间15min,定氢1.4ppm。连铸浇注断面厚度为450mm,连铸中间包钢水过热度6~10℃,动态轻压下8mm,动态重压下14mm,熔炼成分如表2所示。
轧钢工艺实施过程:铸坯加热出钢温度1205℃,第一阶段开轧温度1070℃,最后三道次压下率分别为15%,18%,21%,终轧温度992℃,轧制中间坯厚度160mm。第二阶段开轧温度802℃,终轧温度764℃,轧制成品厚度120mm。钢板经正火(工艺:温度880℃,保温时间140min)+焊后热处理(工艺:温度620℃,保温时间12h)。其性能如表3所示。
实施例3:
炼钢工艺实施过程及熔炼成分同实施例2。
轧钢工艺实施过程:铸坯加热出钢温度1216℃,第一阶段开轧温度1060℃,最后三道次压下率分别为14%,16%,19%,终轧温度985℃,轧制中间坯厚度190mm。第二阶段开轧温度790℃,终轧温度752℃,轧制成品厚度150mm。钢板经正火(工艺:温度880℃,保温时间180min)+焊后热处理(工艺:温度620℃,保温时间12h)。其性能如表3所示,其金相组织如图2所示。
表2 实施例化学成分组成(wt.%)
表3 实施例性能试验结果
表2所示,实施例成分符合设计成分要求。表3所示,本发明钢经控轧控冷、正火、620℃×12h焊后热处理,钢板心部具有优良的强度以及低温韧性,完全满足表1的技术要求,符合特殊压力容器的设计需求。由图1和图2可以看出,其心部组织为细小的珠光体+铁素体。
Claims (4)
1.一种正火Q345级压力容器用厚钢板,采用工艺路线为转炉冶炼→LF精炼→RH/VD真空精炼→连铸→板坯加热→控轧控冷→正火热处理,其特征在于:钢的化学成分质量百分比为C=0.12~0.15,Si=0.10~0.30,Mn=1.50~1.70,P≤0.012,S≤0.003,Alt=0.020~0.050,Nb=0.030~0.040,Cr=0.2~0.30,Ni=0.10~0.20,Cu=0.10~0.20,Ti≤0.005,N=0.006~0.0010,Ceq≤0.47%,其余为Fe和残留元素;钢板厚度80~150mm,组织为细小的珠光体+铁素体,晶粒度9.0~10.0级。
2.一种正火Q345级压力容器用厚钢板的生产方法,其特征在于关键工艺步骤包括:
(1)转炉炼钢:出钢C≥0.07%,P≤0.010%,出钢温度≥1580℃,出钢后进行炉后扒渣操作;
(2)LF精炼:钢水在LF炉总吹氩时间≥35min,白渣保持时间≥18min;钢水出LF前进行软吹氩操作,软吹氩时间>6min;
(3)VD/RH精炼;
(4)连铸:连铸采用断面为300/350/400/450mm,实行全程保护浇铸,浇注温度按液相线温度+(5~13℃)控制,300mm断面采用动态轻压下技术,压下量≥7.0mm;350/400/450mm断面采用动态轻重压下技术,轻压下量≥7.0mm,重压下量≥14.0mm;
(5)板坯加热:板坯在步进炉中进行加热,温度控制在1180~1220℃;
(6)控制轧制:一阶段开轧温度980~1150℃,终轧温度>950℃,后三道次压下率≥14%;二阶段开轧温度在780~820℃,终轧温度740~780℃;
(7)控制冷却:钢板轧后进行加速冷却,冷速2~5℃/s,返红温度650~680℃;
(8)正火:加热温度860~880℃,保温时间为板厚mm×(1.0~1.5)min/mm。
3.根据权利要求2所述的一种Q345级压力容器用厚钢板的生产方法,其特征在于:所述步骤(3)VD/RH精炼为VD精炼,精炼炉真空度在0.5tor以下,保持时间≥15min;VD炉破空后喂入氮线150~200米,喂入氮线速度为180~200米/min,喂线时钢水温度1575~1588℃;破空后氩气软吹时间≥12min。
4.根据权利要求2所述的一种Q345级压力容器用厚钢板的生产方法,其特征在于:所述步骤(3)VD/RH精炼为RH精炼,RH炉真空度在0.5tor以下,保持时间≥12min;RH炉全程吹氮,氮气流量120m3/h,钢水温度1588~1612℃;破空后氩气软吹时间≥12min。
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