CN113714288B - 用于低成本低屈服强度dc01冷轧板的热轧带钢的生产方法 - Google Patents

用于低成本低屈服强度dc01冷轧板的热轧带钢的生产方法 Download PDF

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CN113714288B
CN113714288B CN202110951575.1A CN202110951575A CN113714288B CN 113714288 B CN113714288 B CN 113714288B CN 202110951575 A CN202110951575 A CN 202110951575A CN 113714288 B CN113714288 B CN 113714288B
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何晓波
程官江
黄重
戚新军
厚健龙
崔占利
向华
李龙飞
陈战锋
于永业
李堃
刘伟云
成晓举
高艳
张玉琴
孟晓涛
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Angang Group Cold Rolling Co ltd
Anyang Iron and Steel Co Ltd
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    • B21B1/46—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting
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    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
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    • C21D1/26—Methods of annealing
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    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
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    • C21—METALLURGY OF IRON
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    • C21D8/0226—Hot rolling
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    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
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Abstract

本发明公开了一种用于低成本低屈服强度DC01冷轧板的热轧带钢的生产方法，涉及钢铁冶金技术领域。具体为150t转炉→210mm/230mm板坯连铸机→热态板坯加热→2架粗轧机+7机架1780mm热连轧机组→钢卷冷却后卷取入库→冷轧工序。本发明是在保证产品质量的情况下，简化冶炼流程，提高冶炼效率；改进板坯装入加热炉加热的模式，缩短加热时间，降低加热温度，减少煤气消耗，降低生产成本；优化轧后卷取温度，适当提高热轧原料的铁素体晶粒，改善渗碳体的分布状态，为在冷轧生产工艺不变的条件下，降低DC01冷轧板的屈服强度，满足用户深加工的要求。本发明方法明晰、操作简单，效果明显，推广应用广泛。

Description

用于低成本低屈服强度DC01冷轧板的热轧带钢的生产方法
技术领域
本发明涉及钢铁冶金技术领域，尤其是涉及一种用于低成本低屈服强度DC01冷轧板的热轧带钢的生产方法。
背景技术
在GB/T 5213-2019《冷轧低碳钢板及钢带》中，按用途分DC01为一般用冷轧板，其产品性能要求为：屈服强度≤280MPa，抗拉强度270MPa~410MPa，伸长率按规格进行分级要求。虽然标准中对屈服强度的要求范围宽，但用户在加工过程中常因为其屈服强度偏高，而出现成形性能差或加工开裂的问题，对生产企业多次提出要降低DC01冷轧板屈服强度的要求。
采用“炼钢→LF精炼→板坯连铸→板坯加热→常规热连轧→酸轧联合机组→连续退火机组”等过程工序生产的DC01冷轧板，产品质量好，但就是工艺流程长，成本高，屈服强度也容易偏高（230MPa~260MPa）。
一般用冷轧板DC01冷轧板是冷轧板系列的基础钢种，其应用范围十分广泛。DC01冷轧板是由热轧带钢再加工而成的，热轧带钢生产工艺对冷轧产品性能具有较强的遗传性，所以在保证化学成分不变、酸轧联合机组和连续退火机组工艺制度稳定的情况下，优化原有热轧带钢的冶炼和热轧生产工艺，以低成本低屈服强度的产品性能来保证DC01广泛性和加工成形性。
发明内容
本发明主要涉及为满足优质高效DC01冷轧板生产提供热轧原料的热连轧生产领域，解决一般用冷轧板DC01生产成本和强度性能偏高的问题，发明一种用于低成本低屈服强度DC01冷轧板的热轧带钢的生产方法。
为改善冷轧板DC01生产成本和产品性能偏高的问题，在冷轧生产成本和过程参数不变的条件下，首先必须优化冶炼工序，提高转炉冶炼控制水平，去掉“LF精炼”工序，改为从转炉工序直接到连铸工序，节省一道工序，可降低成本，提高生产效率；其次是改变装钢模式，将“冷态或温态”装入加热炉加热模式改为“热态（板坯温度大于400℃）”装钢模模式，可降低加热温度，减少加热时间，以节省能源消耗，降低生产成本；第三是适当提高卷取温度，以降低热轧原料的强度，从性能遗传方面，可改善冷轧板DC01加工性能。
为实现上述目的，本发明采用的技术方案为：
一种用于低成本低屈服强度DC01冷轧板的热轧带钢的生产方法，具体为150t转炉→210mm/230mm板坯连铸机→热态板坯加热→2架粗轧机+7机架1780mm热连轧机组→钢卷冷却后卷取入库→冷轧工序，具体包括以下步骤：
步骤一，炼钢，150t转炉冶炼采用顶底复吹工艺；
步骤二，连铸，转炉冶炼结束后，将承装钢水的中间包直接调运到连铸平台，进行浇注，连铸坯厚度为210mm或230mm，宽度为1250mm~1450mm，连铸坯拉速为0.9~1.2m/min；每个连铸浇次的头部15~20m、尾部8~10m或连铸过程中异常的连铸坯在线切割后，直接吊运下线，改判为低级别的钢种，或作为报废坯切割回炉；
步骤三，板坯加热，质量正常的连铸坯在线切割后，沿装炉辊道直接装入板坯加热炉，板坯表面入炉温度为600~800℃，板坯加热温度为1160℃~1200℃，加热时间90min~120min；
步骤四，热连轧，加热后的连铸板坯在第一架可逆二辊粗轧机上轧制3道次，在第二架四辊可逆粗轧机上轧制3道次，之后在7机架4辊热连轧精轧机上各轧制1道次，中间坯入精轧温度为1030℃~1050℃，终轧温度为880℃~900℃，轧后带钢经层流冷却后进行卷取，卷取温度为690℃~710℃。
作为优选，所述步骤一中，冶炼时间为27~30min，出钢温度1650℃~1700℃，出钢时成分体系为：C 0.03%~0.08%、Si≤0.03%、Mn 0.13%~0.2%、P≤0.015%、S≤0.020%、Al 0.03%~0.06%、N≤0.004%。
作为优选，所述步骤二中，转炉冶炼结束后，直接上连铸平台进行浇注；且每个连铸浇次的头部15~20m、尾部8~10m或连铸过程中异常的连铸坯不能用于DC01的热轧原料。
作为优选，所述热轧带钢性能指标：屈服强度220MPa~250MPa，抗拉强度340MPa ~360MPa，伸长率A50为44%~47 %，晶粒度8.0~9.5 级。
与现有技术相比，本发明的有益效果为：
1、本发明是在保证产品质量的情况下，简化冶炼流程，提高冶炼效率；改进板坯装入加热炉加热的模式，缩短加热时间，降低加热温度，减少煤气消耗，降低生产成本；优化轧后卷取温度，适当提高热轧原料的铁素体晶粒，改善渗碳体的分布状态，为在冷轧生产工艺不变的条件下，降低DC01冷轧板的屈服强度，满足用户深加工的要求。
2、本发明方法明晰、操作简单，效果明显，推广应用广泛。
具体实施方式
以本公司第二炼轧厂生产铸坯在1780mm热连轧机组轧制，之后到安钢冷轧公司的1550mm酸轧机组和1550mm连退机组采用本发明生产0.4mm~2.0mm一般用冷轧板DC01的实践为例，进一步说明本发明。
实施例1
本实施例生产0.6mm*1250一般用冷轧板DC01时，各工序生产过程具体要求如下：
1）炼钢，150t转炉冶炼为一般用冷轧板DC01提供高效优质热轧带钢时采用顶底复吹工艺，冶炼时间为28min，出钢温度1660℃，出钢时成分体系为：C 0.05%、Si 0.01%、Mn0.18%、P 0.012%、S 0.010%、Al 0.042%、N 0.0032%，其余为Fe和不可避免的杂质。
2）连铸，转炉冶炼结束后，将承装钢水的中间包直接调运到连铸平台，进行浇注，连铸坯厚度为210mm，宽度为1290mm，连铸坯拉速为1.05m/min。将该连铸浇次的头部18m、尾部10m的连铸坯在线切割后，直接吊运下线，改为轧制普通花纹板的板坯。
3）板坯加热，质量正常的连铸坯在线切割后，沿装炉辊道直接装入板坯加热炉，板坯表面入炉温度为720℃，板坯加热温度为1180℃，加热时间115min。
4）热连轧，加热后的连铸板坯在第一架可逆二辊粗轧机上轧制3道次，在第二架四辊可逆粗轧机上轧制3道次，之后在7机架4辊热连轧精轧机上各轧制1道次，中间坯入精轧温度为1040℃，终轧温度为890℃，轧后带钢经层流冷却后进行卷取，卷取温度为698℃。热轧带钢规格为3.0mm*1275mm，其性能指标：屈服强度236MPa，抗拉强度352 MPa，伸长率（A50）45.5%，晶粒度9.0 级。
5）冷轧及退火工艺：冷轧压下率80%，退火温度785℃，缓冷段温度675℃，快冷段温度420℃，过时效段温度400℃，过时效时间为165s。冷轧板DC01产品性能指标：屈服强度214MPa，抗拉强度341MPa，伸长率（A80）40.5 %，晶粒度8.0级。
实施例2
本实施例生产1.5mm*1250一般用冷轧板DC01时，各工序生产过程具体要求如下：
1）炼钢，150t转炉冶炼为一般用冷轧板DC01提供高效优质热轧原料时采用顶底复吹工艺，冶炼时间为30min，出钢温度1685℃，出钢时成分体系为：C 0.03%、Si 0.01%、Mn0.17%、P 0.010%、S 0.008%、Al 0.045%、N 0.0035%，其余为Fe和不可避免的杂质。
2）连铸，转炉冶炼结束后，将承装钢水的中间包直接调运到连铸平台，进行浇注，连铸坯厚度为230mm，宽度为1450mm，连铸坯拉速为1.2m/min。将该连铸浇次的头部16m、尾部9m的连铸坯在线切割后，直接吊运下线，改为轧制普通花纹板的板坯。
3）板坯加热，质量正常的连铸坯在线切割后，沿装炉辊道直接装入板坯加热炉，板坯表面入炉温度为780℃，板坯加热温度为1200℃，加热时间108min。
4）热连轧，加热后的连铸板坯在第一架可逆二辊粗轧机上轧制3道次，在第二架四辊可逆粗轧机上轧制3道次，之后在7机架4辊热连轧精轧机上各轧制1道次，中间坯入精轧温度为1042℃，终轧温度为887℃，轧后带钢经层流冷却后进行卷取，卷取温度为700℃。热轧带钢规格为6.0mm*1450mm，其性能指标：屈服强度230MPa，抗拉强度348 MPa，伸长率（A50）46%，晶粒度8.5 级。
5）冷轧及退火工艺：冷轧压下率75%，退火温度790℃，缓冷段温度675℃，快冷段温度420℃，过时效段温度400℃，过时效时间为190s。冷轧板DC01产品性能指标：屈服强度198MPa，抗拉强度340MPa，伸长率（A80）42 %，晶粒度7.5级。
尽管已经示出和描述了本发明的实施例，对于本领域的普通技术人员而言，可以理解在不脱离本发明的原理和精神的情况下可以对这些实施例进行多种变化、修改、替换和变型，本发明的范围由所附权利要求及其等同物限定。

Claims (1)

1.用于低成本低屈服强度DC01冷轧板的热轧带钢的生产方法，其特征在于，所述生产方法具体为150t转炉→210mm/230mm板坯连铸机→热态板坯加热→2架粗轧机+7机架1780mm热连轧机组→钢卷冷却后卷取入库→冷轧工序，具体包括以下步骤：
步骤一，炼钢，150t转炉冶炼采用顶底复吹工艺，冶炼时间为30min，出钢温度1685℃，出钢时成分体系为：C 0.03%、Si 0.01%、Mn 0.17%、P 0.010%、S 0.008%、Al 0.045%、N0.0035%，其余为Fe和不可避免的杂质；
步骤二，连铸，转炉冶炼结束后，将承装钢水的中间包直接调运到连铸平台，进行浇注，连铸坯厚度为230mm，宽度为1450mm，连铸坯拉速为1.2m/min；每个连铸浇次的头部16m、尾部9m或连铸过程中异常的连铸坯在线切割后，直接吊运下线；
步骤三，板坯加热，质量正常的连铸坯在线切割后，沿装炉辊道直接装入板坯加热炉，板坯表面入炉温度为780℃，板坯加热温度为1200℃，加热时间108min；
步骤四，热连轧，加热后的连铸板坯在第一架可逆二辊粗轧机上轧制3道次，在第二架四辊可逆粗轧机上轧制3道次，之后在7机架4辊热连轧精轧机上各轧制1道次，中间坯入精轧温度为1042℃，终轧温度为887℃，轧后带钢经层流冷却后进行卷取，卷取温度为700℃；
热轧带钢规格为6.0mm*1450mm，其性能指标：屈服强度230MPa，抗拉强度348MPa，伸长率A50为46%，晶粒度8.5 级；
所述生产方法生产的热轧带钢作为DC01冷轧板生产的热轧原料，经过冷轧及退火工艺生产DC01冷轧板，所述冷轧及退火工艺：冷轧压下率75%，退火温度790℃，缓冷段温度675℃，快冷段温度420℃，过时效段温度400℃，过时效时间为190s；冷轧板DC01产品性能指标：屈服强度198MPa，抗拉强度340MPa，伸长率A80为42 %，晶粒度7.5级。
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