CN112941409A - 低温钢及其制造方法 - Google Patents
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Abstract
本发明公开了一种低温钢及其制造方法,该低温钢的成分以质量百分比计包括C:0.6~0.8%、Mn:18~20%、Ni:4~6%、Si:≤0.5%、P:≤0.02%、S:≤0.01%,余量的Fe和不可避免的杂质。其成分设计以C、Mn、Ni为主要合金元素,获得了在‑269℃仍具有优良冲击韧性的奥氏体组织低温钢。该钢与9%Ni钢和铬镍奥氏体不锈钢相比Ni含量更低,与9%Ni钢相比使用温度更低,且不需要进行调质或固溶处理等热处理,制造工艺更为简单。
Description
技术领域
本发明涉及一种钢及其制造方法,具体涉及一种-269℃冲击韧性优良的低温钢及其制造方法。
背景技术
液氢、液氦等相关低温领域需要使用具有优良低温性能的材料,最低服役温度低至-269℃。9%Ni钢和铬镍奥氏体不锈钢是常用的低温用钢,9%Ni钢的使用温度不低于-196℃,铬镍奥氏体不锈钢则可在更低温度下使用。然而,两者都添加了大量的Ni元素,铬镍奥氏体体不锈钢还添加了大量的Cr元素,此外生产过程还需要调质(9%Ni钢)或固溶(铬镍奥氏体不锈钢)等热处理,因此制造成本高、工艺复杂。
发明内容
发明目的:为了克服现有技术的缺陷,本发明提供一种低温钢,该钢较少添加或不添加Ni、Cr元素,且无需热处理,能够保证在-269℃仍具有优良冲击韧性。
本发明的另一目的是提供一种上述低温钢的制造方法。
技术方案:本发明所述的一种低温钢,成分以质量百分比计,包括C:0.6~0.8%、Mn:18~20%、Ni:4~6%、Si:≤0.5%、P:≤0.02%、S:≤0.01%,余量的Fe和不可避免的杂质。
该低温钢的成分设计机理如下:
首先,成分设计要从根本上将材料组织类型改变为奥氏体,并使得奥氏体具有足够高的稳定性从而在低温下不发生相变,进而在不增加Ni含量的情况下使材料在更低温度下具有优良冲击韧性。
具体而言,与Ni元素相比,Mn和C稳定奥氏体的效果更强,且能够明显提高材料强度。但是,每种元素都有其作用特点,应当复合添加多种元素并选取最佳配比。
因此,本发明通过添加0.6~0.8%的C、18~20%的Mn和4~6%的Ni,使得任何温度下的奥氏体的自由能始终低于马氏体,并将奥氏体在室温至-269℃温度范围内的层错能控制在5~40mJ·m-2,主要以孪晶机制实现强化与韧化。奥氏体组织的FCC晶体结构具有很高的抵抗裂纹扩展的能力,能够在冲击形变过程中提高裂纹扩展功,从而提高冲击韧性。
除上述化学成分外,本发明对其它元素的添加和范围进行了限定。Si能够产生一定程度的固溶强化,但Si在晶界偏聚会弱化晶界并提高沿晶脆性,此外Si还会降低塑性,Si的含量应控制在0.5%以下。此外,有害元素P和S会显著损害低温韧性,需要控制上限,P≤0.02%、S≤0.01%。
对应于上述低温钢,本发明提供的制造方法所采用的技术方案包括如下步骤:
(1)坯料选择:在目标成分的坯料中选择,坯料厚度150~320mm,且坯料与钢板的厚度比值不小于8;
(2)坯料加热:目标温度1130~1230℃;加热过程控制为:室温~700℃范围内的加热时间≥(0.6min/mm)×H,700℃至目标温度的加热时间≥(0.4min/mm)×H,目标温度下的均热时间≥(0.1min/mm)×H,其中H为坯料厚度;加热气氛的氧气体积分数≤3%;
(3)坯料轧制:开轧温度≤1100℃,终轧目标温度890~940℃;道次变形量≥10%;
(4)钢板冷却:轧制后钢板浇水加速冷却,开冷温度≥800℃,终冷温度≤300℃;水冷结束后空冷至室温。
该制造方法的机理如下:
坯料加热时得到一定晶粒尺寸的高温奥氏体组织,同时合金元素通过扩散方式均匀化。加热温度过高将导致过热甚至过烧,而加热温度过低不利于合金元素的均匀化,因此本发明将加热温度控制在1130-1230℃。加热后坯料进行轧制,通过再结晶细化获得尺寸均匀的等轴奥氏体晶粒,要求在奥氏体完全再结晶区进行轧制,因此本发明将轧制变形温度控制在890℃以上,并且通过控制终轧温度在890~940℃以保证足够的晶粒细化效果。为了获得足够的高温再结晶晶粒细化效果,要求坯料与轧制钢板的厚度比不小于8。
除了获得细化奥氏体组织之外,还需要抑制晶界上的渗碳体析出才能够确保足够的晶界强度,以实现优良的低温韧性。本发明低温钢的渗碳体析出温度低于800℃,因此要求轧制后钢板的开冷温度≥800℃,冷却至300℃及以下。在300℃以下碳化物析出缓慢,可以进行空冷。钢板无需进行热处理。
有益效果:本发明以C、Mn、Ni为主要合金元素进行成分设计,获得了具有高稳定性和特定层错能的奥氏体组织、以及在-269℃仍具有优良冲击韧性的低温钢。该钢与9%Ni钢和铬镍奥氏体不锈钢相比Ni含量更低,与9%Ni钢相比使用温度更低,且不需要进行调质或固溶处理等热处理,制造工艺更为简单。
附图说明
图1是本发明实施例1中钢板的V型缺口夏比冲击试验冲击功随试验温度的变化曲线。
具体实施方式
实施例1:低温钢的化学成分及其质量分数分别为0.69%C、19%Mn、5.2%Ni、0.24%Si、0.011%P,0.003%S,以及余量Fe和杂质元素。钢板厚度20mm,如图1所示,冲击功随温度降低而近似呈线性规律降低,-269℃的V型缺口夏比冲击试验冲击功93J。
钢板轧制方法:使用与上述成分相同的坯料,厚度260mm。坯料加热温度1180℃;室温~700℃范围内的加热时间178min,700~1180℃的加热时间125min,均热时间31min,加热气氛的氧气体积分数1.8%。开轧温度1080℃,终轧温度917℃。轧制后钢板浇水加速冷却,开冷温度845℃,终冷温度170℃,水冷结束后空冷至室温。
实施例2:低温钢的化学成分及其质量分数分别为0.69%C、19%Mn、5.2%Ni、0.24%Si、0.011%P,0.003%S,以及余量Fe和杂质元素。钢板厚度5mm,-269℃的V型缺口夏比冲击试验冲击功59J。
钢板轧制方法:使用与上述成分相同的坯料,厚度150mm。坯料加热温度1230℃;室温~700℃范围内的加热时间90min,700~1230℃的加热时间65min,均热时间20min,加热气氛的氧气体积分数3%。开轧温度1100℃,终轧温度890℃。轧制后钢板浇水加速冷却,开冷温度811℃,终冷温度52℃,水冷结束后空冷至室温。
实施例3:低温钢的化学成分及其质量分数分别为0.69%C、19%Mn、5.2%Ni、0.24%Si、0.011%P,0.003%S,以及余量Fe和杂质元素。钢板厚度40mm,-269℃的V型缺口夏比冲击试验冲击功107J。
钢板轧制方法:使用与上述成分相同的坯料,厚度320mm。坯料加热目标温度1130℃;室温~700℃范围内的加热时间195min,700~1130℃的加热时间140min,均热时间39min,加热气氛的氧气体积分数1.1%。开轧温度1042℃,终轧温度940℃。轧制后钢板浇水加速冷却,开冷温度880℃,终冷温度287℃,水冷结束后空冷至室温。
实施例4:低温钢的化学成分及其质量分数分别为0.6%C、18%Mn、4%Ni、0.5%Si、0.008%P,0.006%S,以及余量Fe和杂质元素。钢板厚度20mm,-269℃的V型缺口夏比冲击试验冲击功91J。
钢板轧制方法:使用与上述成分相同的坯料,厚度260mm。坯料加热温度1200℃;室温~700℃范围内的加热时间183min,700~1180℃的加热时间104min,均热时间30min,加热气氛的氧气体积分数1.6%。开轧温度1100℃,终轧温度924℃。轧制后钢板浇水加速冷却,开冷温度856℃,终冷温度300℃,水冷结束后空冷至室温。
实施例5:低温钢的化学成分及其质量分数分别为0.8%C、20%Mn、6%Ni、0.12%Si、0.016%P,0.004%S,以及余量Fe和杂质元素。钢板厚度20mm,-269℃的V型缺口夏比冲击试验冲击功75J。
钢板轧制方法:使用与上述成分相同的坯料,厚度280mm。坯料加热温度1190℃;室温~700℃范围内的加热时间191min,700~1180℃的加热时间140min,均热时间28min,加热气氛的氧气体积分数1.6%。开轧温度1080℃,终轧温度900℃。轧制后钢板浇水加速冷却,开冷温度800℃,终冷温度192℃,水冷结束后空冷至室温。
Claims (6)
1.一种低温钢,其特征在于,成分以质量百分比计,包括C:0.6~0.8%、Mn:18~20%、Ni:4~6%、Si:≤0.5%、P:≤0.02%、S:≤0.01%,余量的Fe和不可避免的杂质。
2.根据权利要求1所述的低温钢,其特征在于,组织为奥氏体。
3.根据权利要求1所述的低温钢,其特征在于,钢板的厚度为5~40mm。
4.根据权利要求1所述的低温钢,其特征在于,包括C:0.69~0.8%、Mn:19~20%、Ni:4~5.2%、Si:≤0.24%、P:≤0.02%、S:≤0.01%,余量的Fe和不可避免的杂质。
5.根据权利要求3所述的低温钢,其特征在于,钢板的-269℃的V型缺口夏比冲击试验冲击功59J以上。
6.一种根据权利要求1-5任一项所述的低温钢的制造方法,其特征在于,包括如下步骤:
(1)坯料选择:在目标成分的坯料中选择,坯料厚度150~320mm,且坯料与钢板的厚度比值不小于8;
(2)坯料加热:目标温度1130~1230℃;加热过程控制为:室温~700℃范围内的加热时间≥(0.6min/mm)×H,700℃至目标温度的加热时间≥(0.4min/mm)×H,目标温度下的均热时间≥(0.1min/mm)×H,其中H为坯料厚度;加热气氛的氧气体积分数≤3%;
(3)坯料轧制:开轧温度≤1100℃,终轧目标温度890~940℃;道次变形量≥10%;
(4)钢板冷却:轧制后钢板浇水加速冷却,开冷温度≥800℃,终冷温度≤300℃;水冷结束后空冷至室温。
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