CN116065012A - 一种核用大厚度冷轧奥氏体不锈钢生产方法 - Google Patents
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Abstract
本发明公开了一种核用大厚度冷轧奥氏体不锈钢生产方法,利用现有生产设备,通过合理的工艺流程和工艺参数设定,生产的大厚度(3.0~6.0mm)不锈钢产品满足核用冷轧奥氏体不锈钢产品组织以及表面粗糙度的要求。其中,热轧黑卷采用低退火温度,只进行去应力、软化带钢处理,既可以保证热退火酸洗线能正常卷曲,又可以确保第二次退火酸洗后金相组织的均匀性;通过合理设定冷轧二十辊轧机轧制规程和用辊制度,可以确保二次退火酸洗后组织的均匀性和带钢表面粗糙度;二次退火酸洗时通过对抛丸工艺、酸洗工艺以及刷洗机刷洗工艺进行合理的控制,使得最终产品粗糙度Ra≤1.6μm,满足核用冷轧奥氏体不锈钢的技术要求。
Description
技术领域
本发明属于核用不锈钢生产技术领域,具体是一种核用大厚度冷轧奥氏体不锈钢生产方法。
背景技术
奥氏体不锈钢因其良好的耐辐照性能,在核电领域得到广泛使用,而在部分核电设备制造过程中需要大厚度(3.0~6.0mm)的冷轧奥氏体不锈钢,具体要求是表面粗糙度Ra≤1.6μm,组织为大小均匀的再结晶组织。通常大厚度(3.0~6.0mm)不锈钢只能在热退火酸洗线生产,最终产品表面粗糙度Ra≥3.0μm,无法满足核电设备的使用要求。冷轧奥氏体不锈钢通常在冷退火酸洗线生产,但是只能够生产厚度为0.3~3.0mm的产品,因此只能利用热退火酸洗线生产3.0~6.0mm大厚度产品。常规的轧制工艺由于产品较厚、压下率小,采用常规退火工艺会造成组织不均匀;常规的酸洗工艺表面的粗糙度较大,无法满足核电设备粗糙度Ra≤1.6μm的要求。
发明内容
本发明的目的是提供一种核用大厚度冷轧奥氏体不锈钢生产方法,以解决目前常规工艺无法满足核用大厚度冷轧奥氏体不锈钢对产品组织均匀度以及表面粗糙度Ra≤1.6μm要求的技术问题。
为实现其目的,本发明采用如下技术方案:
一种核用大厚度冷轧奥氏体不锈钢生产方法,包括以下步骤:
步骤一、按照常规工艺冶炼、连铸生产核用奥氏体不锈钢连铸板坯,所述板坯成分以重量百分比计为C:≤0.080%,Si:≤1.00%,Mn:≤2.00%,P:≤0.030%,S:≤0.015%,Ni:8.00~11.00%,Cr:17.00~20.00%,Co:≤0.10%,其它为Fe和残留元素;
步骤二、将步骤一中所述板坯进行全修磨处理;
步骤三、将修磨后的板坯通过加热炉加热后热轧至目标厚度,得到热轧黑卷;
步骤四、将步骤三中热轧黑卷上热退火酸洗线,并上线两次:
第一次上热退火酸洗线生产时退火温度按照800~820℃设定,低退火温度主要是为
了消除应力、软化带钢,不需要发生完全再结晶,其余参数按照常规工艺执行;
将上述第一次退火、酸洗完的不锈钢卷用冷轧二十辊轧机冷轧至目标厚度3.0~6.0mm,得到冷轧硬态钢卷;
将上述冷轧硬态钢卷再次上热退火酸洗线,退火温度按照1050~1100℃控制,其余参数按照常规工艺执行,得到金相组织和表面粗糙度均符合核用标准的奥氏体不锈钢。
作为本发明技术方案的进一步优选,上述步骤一中,板坯规格为:220mm×1250mm×(8000-9000)mm。
进一步地,步骤四中,所述冷轧规程按照两道次或者三道次排布,最后一道次用精轧辊,其余道次用粗轧辊。
进一步地,步骤四中,所述冷轧硬态钢卷再次上热退火酸洗线时,四组抛丸机只投用一组,所述抛丸机抛丸速度为67~70m/s、抛丸流量为8~10kg/m2,酸洗之前投用重刷,重刷投用5挡。
本发明相对于现有技术具有以下有益效果:
1、本发明利用现有生产设备,通过合理的工艺流程和工艺参数设定,生产的大厚度(3.0~6.0mm)不锈钢产品满足核用冷轧奥氏体不锈钢产品组织以及表面粗糙度的要求。
2、热轧黑卷采用低退火温度,只进行去应力、软化带钢处理,既可以保证热退火酸洗线能正常卷曲,又可以确保第二次退火酸洗后金相组织的均匀性。
3、通过合理设定冷轧二十辊轧机轧制规程和用辊制度,可以确保二次退火酸洗后组织的均匀性和带钢表面粗糙度。
4、二次退火酸洗时通过对抛丸工艺、酸洗工艺以及刷洗机刷洗工艺进行合理的控制,使得最终产品粗糙度Ra≤1.6μm,满足核用冷轧奥氏体不锈钢的技术要求。
附图说明
图1为本发明实施例1核用大厚度冷轧奥氏体不锈钢的金相组织图;
图2为本发明实施例2核用大厚度冷轧奥氏体不锈钢的金相组织图;
图3为本发明实施例3核用大厚度冷轧奥氏体不锈钢的金相组织图。
具体实施方式
下面通过具体实施例对本发明一种核用大厚度冷轧奥氏体不锈钢生产方法作进一步详细说明。可以理解的是,此处所描述的具体实施例仅用于解释本发明,而非对该发明的限定。
实施例1
步骤一、按照常规工艺冶炼、连铸生产核用奥氏体不锈钢连铸板坯,所述板坯规格
为:220mm×1250mm×9000mm;所述板坯成分以重量百分比计为
C:0.024%,Si:0.44%,Mn:1.50%,P:0.024%,S:0.0006%,Ni:8.24%,Cr:18.20%,
Co:0.06%,其它为Fe和残留元素;
步骤二、将步骤一的板坯进行全修磨处理,修磨深度3.5mm;
步骤三、将步骤二修磨后的板坯通过加热炉加热后进行热轧,轧制目标厚度为7.5mm,得到热轧黑卷;
步骤四、将步骤三的热轧黑卷第一次上热退火酸洗线生产,退火温度为800℃,退火时间5min,其余工艺按照常规工艺执行;
将上述第一次退火、酸洗完的不锈钢卷用冷轧二十辊轧机冷轧至目标厚度6.0mm,得到冷轧硬态钢卷;轧制规规程按照两道次进行排布;
将上述冷轧硬态钢卷第二次上热退火酸洗线。退火温度为1050℃,退火时间4min;四组抛丸机只投用一组,这一组抛丸机抛丸速度为67m/s、抛丸流量为8kg/m2,酸洗之前投用重刷,重刷投用5挡。最终产品的表面粗糙度Ra为1.2μm,金相组织如图1所示。
实施例2
步骤一、按照常规工艺冶炼、连铸生产核用奥氏体不锈钢连铸板坯,所述板坯规格
为:220mm×1250mm×8000mm;所述板坯成分以重量百分比计为
C:0.025%,Si:0.38%,Mn:1.48%,P:0.024%,S:0.0007%,Ni:8.19%,Cr:18.15%,
Co:0.08%,其它为Fe和残留元素;
步骤二、将步骤一的板坯进行全修磨处理,修磨深度2.8mm;
步骤三、将步骤二修磨后的板坯通过加热炉加热后进行热轧,轧制目标厚度为4.5mm,得到热轧黑卷;
步骤四、将步骤三的热轧黑卷第一次上热退火酸洗线生产,退火温度为820℃,退火时间3min,其余工艺按照常规工艺执行;
将上述第一次退火、酸洗完的不锈钢卷用冷轧二十辊轧机冷轧至目标厚度3.0mm,得到冷轧硬态钢卷;轧制规规程按照两道次进行排布;
将上述冷轧硬态钢卷第二次上热退火酸洗线。退火温度为1070℃,退火时间2.5min;四组抛丸机只投用一组,这一组抛丸机抛丸速度为68m/s、抛丸流量为9kg/m2,酸洗之前投用重刷,重刷投用5挡。最终产品的表面粗糙度Ra为1.0μm,金相组织如图2所示。
实施例3
步骤一、按照常规工艺冶炼、连铸生产核用奥氏体不锈钢连铸板坯,所述板坯规格
为:220mm×1250mm×8500mm;所述板坯成分以重量百分比计为
C:0.022%,Si:0.44%,Mn:1.49%,P:0.026%,S:0.0007%,Ni:8.19%,Cr:18.21%,
Co:0.07%,其它为Fe和残留元素;
步骤二、将步骤一的板坯进行全修磨处理,修磨深度3.2mm;
步骤三、将步骤二修磨后的板坯通过加热炉加热后进行热轧,轧制目标厚度为6.0mm,得到热轧黑卷;
步骤四、将步骤三的热轧黑卷第一次上热退火酸洗线生产,退火温度为810℃,退火时间4min,其余工艺按照常规工艺执行;
将上述第一次退火、酸洗完的不锈钢卷用冷轧二十辊轧机冷轧至目标厚度5.0mm,得到冷轧硬态钢卷;轧制规规程按照两道次进行排布;
将上述冷轧硬态钢卷第二次上热退火酸洗线。退火温度为1100℃,退火时间3.5min;四组抛丸机只投用一组,这一组抛丸机抛丸速度为70m/s、抛丸流量为10kg/m2,酸洗之前投用重刷,重刷投用5挡。最终产品的表面粗糙度Ra为0.9μm,金相组织如图3所示。
Claims (4)
1.一种核用大厚度冷轧奥氏体不锈钢生产方法,其特征在于,包括以下步骤:
步骤一、按照常规工艺冶炼、连铸生产核用奥氏体不锈钢连铸板坯,所述板坯成分以重量百分比计为C:≤0.080%,Si:≤1.00%,Mn:≤2.00%,P:≤0.030%,S:≤0.015%,Ni:8.00~11.00%,Cr:17.00~20.00%,Co:≤0.10%,其它为Fe和残留元素;
步骤二、将步骤一中所述板坯进行全修磨处理;
步骤三、将修磨后的板坯通过加热炉加热后热轧至目标厚度,得到热轧黑卷;
步骤四、将步骤三中热轧黑卷上热退火酸洗线,并上线两次:
第一次上热退火酸洗线生产时退火温度按照800~820℃设定,其余参数按照常规工
艺执行;
将上述第一次退火、酸洗完的不锈钢卷用冷轧二十辊轧机冷轧至目标厚度3.0~6.0mm,得到冷轧硬态钢卷;
将上述冷轧硬态钢卷再次上热退火酸洗线,退火温度按照1050~1100℃控制,其余
参数按照常规工艺执行,得到金相组织和表面粗糙度均符合核用标准的奥氏体不锈钢。
2.如权利要求1所述的一种核用大厚度冷轧奥氏体不锈钢生产方法,其特征在于,步骤一中,所述板坯规格为:220mm×1250mm×(8000-9000)mm。
3.如权利要求2所述的一种核用大厚度冷轧奥氏体不锈钢生产方法,其特征在于,步骤四中,所述冷轧规程按照两道次或者三道次排布,最后一道次用精轧辊,其余道次用粗轧辊。
4.如权利要求3所述的一种核用大厚度冷轧奥氏体不锈钢生产方法,其特征在于,步骤四中,所述冷轧硬态钢卷再次上热退火酸洗线时,四组抛丸机只投用一组,所述抛丸机抛丸速度为67~70m/s、抛丸流量为8~10kg/m2,酸洗之前投用重刷,重刷投用5挡。
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