CN112317536B - 一种极限薄规格花纹板的制造方法 - Google Patents
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Abstract
本发明公开了一种极限薄规格花纹板的制造方法,属于钢铁冶金领域,所述的花纹板化学成分及质量百分比为:C:≤0.06%,Si:0.08%~0.18%,Mn:0.95%~1.25%,P≤0.020%,S≤0.015%,余量为Fe和杂质;制造方法步骤包括:板坯加热→粗轧→精轧→层流冷却→卷取。与现有技术相比较,本发明生产的1.2mm极限薄规格花纹板纹高在0.16mm~0.25mm,断后伸长率可达29%,成材率在96.5%以上。
Description
技术领域
本发明涉及冶金领域,特别是一种适用于极限薄规格花纹钢板的制造方法,能在常规热轧生产线生产1.2mm极薄规格花纹板。
背景技术
节能环保越来越成为社会广泛关注的话题,轻量化也广泛应用到社会各行各业,在保证产品整体品质不变的前提下,降低自身的重量,既节约了能源,又提高了企业经营效益。目前,花纹板市场主流规格≥1.5mm,在一些电子台秤底板、小推车底板上使用1.5mm以上厚度花纹板,多数设备在其使用周期结束后,底板无任何损坏,所以降低底板的厚度,也被认为是降低制造业生产企业成本的重要因素,极薄规格花纹板市场前景广泛。
我国极限薄规格花纹板受装备水平及工艺控制能力限制,尚处于起步阶段,尽管许多钢厂在极限薄规格花纹板方面做了大量研究工作,但是,不能满足1.2mm厚度极限薄规格花纹板市场需求。
例如,中国专利申请《一种薄规格花纹板及其生产方法》(申请号201810347775.4)公开的生产方法为:(1)钢水经过反向旋转的一对铜铸辊形成连续铸带;(2)铸带经过一道次热轧轧制成薄规格热轧带钢;(3)在第一机架热轧机后配置花纹轧机,将热轧带钢上表面轧制成设计的花纹形状;(4)对轧后花纹板进行冷却,并卷取成卷。其方法使用超薄带双辊铸轧生产线,因此不能批量生产,且过渡规格较多,不适合工业生产。
又如,中国专利申请《700MPa含钒热轧花纹钢板及其生产方法》(申请号201810515363.7)公开的花纹板其化学成分为C:0.06%-0.09%,Si:0.15%-0.35%,Mn:1.35%-1.50%,P≤0.020%,S≤0.010%,Nb:0.025-0.035%,Ti:0.09-0.11%,V:0.015~0.025%,Als:0.020~0.060%,N≤0.0060%,余量为Fe和杂质;工艺包括加热、高压水除鳞、刻槽、控制轧制、卷曲工序。可生产出花纹钢板厚度为1.5-8.0mm,延伸率21~26%的花纹板,不足之处为合金元素含量较高,且延伸率低,不适合在一些电子台秤底板、小推车底板上使用。
发明内容
本发明的技术任务是针对以上现有技术的不足,提供一种基于常规热连轧生产线生产极限薄规格花纹板的制造方法,从而获得具有高成材率、批量稳定生产及板形、表面质量良好的极限薄规格花纹板。
本发明解决其技术问题的技术方案是:一种极限薄规格花纹板的制造方法,其特征在于:所述的花纹板化学成分及质量百分比为:C:≤0.06%,Si:0.08%~0.18%,Mn:0.95%~1.25%,P≤0.020%,S≤0.015%,余量为Fe和杂质;制造方法步骤包括:板坯加热→粗轧→精轧→层流冷却→卷取;所述的板坯加热采用四段加热方式;所述的粗轧终轧温度控制在1130℃~1080℃;所述的精轧开轧温度整体控制在1000℃~1050℃,终轧温度850~880℃,穿带速度控制在600~650m/min;花纹辊形设计采用扁豆形,花纹辊槽口豆宽9.0mm,豆长31.5mm,花纹辊表面至槽底沿长度方向为圆弧形,辊槽底部由半径R为2.5mm平滑圆弧连接,表面至槽底>3.5mm;所述层冷卷取的卷取温度580-620℃。
上述板坯长度8600-9700mm,宽度1010-1260mm,厚度210mm。
上述板坯加热步骤的在炉时间热坯≥180min,冷坯≥210min。
上述四段加热方式的温度分别为:预热段950-1100℃,第一加热段1150-1250℃,第二加热段1300-1350℃,均热段温度1290℃~1330℃。
上述粗轧后投用中间辊道保温罩及热卷箱。
与现有技术相比较,本发明具有以下突出的有益效果:
1、本发明采取了低碳低合金的成分设计,满足客户后期加工中个性化折弯需求,断后伸长率可达29%;
2、采用极限薄规格花纹板加热制度,采用四段加热方式,其中预热段950-1100℃,第一加热段1150-1250℃,第二加热段1300-1350℃,均热段温度控制在1290℃~1330℃,保证钢坯温度均匀稳定。采用独特的轧钢压下制度,前两道次压下率保证>50%,末机架压下率>15%,保证末道次穿带及保证花纹板豆高;
3、实现了极限薄规格花纹板在常规热连轧生产线的连续批量稳定生产,最薄厚度达到1.2mm,单次轧程可连续轧制1.2mm厚度花纹板13块200吨以上,成材率在96.5%以上。
4、本发明生产的1.2mm极限薄规格花纹板纹高在0.16mm~0.25mm。
5、在电子台秤底板、小推车底板上使用厚度1.2mm替代厚度1.5mm,在不影响使用性能情况下可节约钢材26%。
具体实施方式
下面结合具体实施方式对本发明进一步说明。
本发明公开了一种极限薄规格花纹板的制造方法,采用低碳低锰低磷低合金独特成分设计,通过优化花纹辊豆形、控制加热、轧制、卷取等工序参数,实现了1.2mm厚度极限薄规格花纹板批量稳定生产,在电子台秤底板、小推车底板上相同使用面积情况,具有更低比重值。
本发明极限薄规格花纹板的化学成分及质量百分比为:C:≤0.06%,Si:0.08%~0.18%,Mn:0.95%~1.25%,P≤0.020%,S≤0.015%,余量为Fe和杂质。
本发明步骤包括:板坯加热→粗轧→精轧→层流冷却→卷取。
1、板坯加热
板坯长度8600-9700mm,宽度1010-1260mm,厚度210mm,在炉时间热坯≥180min,冷坯≥210min,采用四段加热方式,其中预热段950-1100℃,第一加热段1150-1250℃,第二加热段1300-1350℃,确保均热段温度1290℃~1330℃,保证板坯温度均匀,同板坯温差≤15℃。
2、粗轧
粗轧终轧温度控制在1130℃~1080℃,粗轧6道次,粗轧采用1+5模式,粗轧后中间坯厚度30~34mm,粗轧压下量173~177mm,粗轧后投用中间辊道保温罩及热卷箱缓解中间坯温降。
3、精轧
精轧机架间冷却水关闭,检查轧线漏水点,工作辊上水切间隙≤1mm,保证轧制过程中板坯温度均匀稳定。
精轧开轧温度整体控制在1000℃~1050℃,精轧7道次,终轧温度850~880℃,穿带速度控制在600~650m/min。
F1-F4采用大辊径工作辊(辊径760~850mm),F5-F7使用小辊径工作辊(辊径630~700mm),可以通过增加F1-F4轧制力,此阶段带钢厚度较大,金属更容易横向流动,带钢凸度值较容易调整,本发明F6出口凸度控制为60μm,可相应减少F7凸度调整值达25%。来优化板形确保带钢的平直度,精轧末道次上辊为花纹辊,下辊为平辊,F1~F7压下率分别为55-60%、52-58%、35-40%、28-35%、18-25%、14-18%、15-25.2%,前两道次压下率保证>50%,末机架压下率>15%,保证末道次穿带及保证花纹板豆高。为保证成品钢卷板形,F1-F6采用CVC辊型,F7采用-0.04mm的辊型。
本发明花纹辊形设计采用扁豆形,花纹辊槽口豆宽由传统厚板工艺的5.0mm调整为9.0mm,豆长由原有的27mm调整为31.5mm,花纹辊表面至槽底沿长度方向为圆弧形,减少了F7两个肩部支撑辊在连续轧制极限花纹板的掉肉状况,辊槽底部由半径R为2.5mm平滑圆弧连接,表面至槽底>3.5mm,保证花纹豆高满足客户需求,豆表面圆润光滑。花纹辊在轧制一个计划后,重复磨削使用,豆深会变浅,为改善花纹豆高,轧辊豆深<2.4mm后,花纹辊报废。
4、层冷卷取
卷取温度580-620℃,头部不开水,头部穿带后粗调开1组,达到最高速度后逐级精调开2~4组,F1抛钢时逐组关闭,F7抛钢后精调开2~4组,调节层冷侧喷角度,避免直接喷带钢边部,控制边部温度过渡降低,控制边部浪形的发生。
卷取张力设定15.5N/mm2,卷取夹送辊下导板间隙≤0.8mm,过渡板入口间隙≤0.8mm,卷取活门间隙≤1mm。
经由上述工艺步骤,所得成品参数见下表:
分组 | 厚度mm | 纹高mm | 伸长率% |
实施例1 | 1.21 | 0.23 | 29 |
实施例2 | 1.19 | 0.19 | 27 |
实施例3 | 1.16 | 0.16 | 29 |
由上述结果可以看出,使用本发明,1.2mm厚度基板实际测量值1.15-1.21mm,纹高在0.16mm~0.25mm。断后伸长率可达29%。成品成材率在96.5%以上,表面质量、板形稳定,可批量稳定生产。
需要说明的是,本发明的特定实施方案已经对本发明进行了详细描述,对于本领域的技术人员来说,在不背离本发明的精神和范围的情况下对它进行的各种显而易见的改变都在本发明的保护范围之内。
Claims (5)
1.一种极限薄规格花纹板的制造方法,其特征在于:所述的花纹板化学成分及质量百分比为:C:≤0.06%,Si:0.08%~0.18%,Mn:0.95%~1.25%,P≤0.020%,S≤0.015%,余量为Fe和杂质;制造方法步骤包括:板坯加热→粗轧→精轧→层流冷却→卷取;所述的板坯加热采用四段加热方式;所述板坯厚度210mm;所述的粗轧终轧温度控制在1130℃~1080℃;所述的精轧开轧温度整体控制在1000℃~1050℃,终轧温度850~880℃,穿带速度控制在600~650m/min;F1-F4采用大辊径工作辊,F5-F7使用小辊径工作辊,F6出口凸度控制为60μm,精轧末道次上辊为花纹辊,下辊为平辊,F1~F7压下率分别为55-60%、52-58%、35-40%、28-35%、18-25%、14-18%、15-25.2%,前两道次压下率保证>50%,末机架压下率>15%;花纹辊形设计采用扁豆形,花纹辊槽口豆宽9.0mm,豆长31.5mm,花纹辊表面至槽底沿长度方向为圆弧形,辊槽底部由半径R为2.5mm平滑圆弧连接,表面至槽底>3.5mm;所述层流冷却卷取的卷取温度580-620℃;所述的极限薄规格厚度为1.2mm,纹高在0.16mm~0.25mm。
2.根据权利要求1所述的极限薄规格花纹板的制造方法,其特征在于:所述板坯长度8600-9700mm,宽度1010-1260mm。
3.根据权利要求2所述的极限薄规格花纹板的制造方法,其特征在于:所述板坯加热步骤的在炉时间热坯≥180min,冷坯≥210min。
4.根据权利要求2所述的极限薄规格花纹板的制造方法,其特征在于:所述四段加热方式的温度分别为:预热段950-1100℃,第一加热段1150-1250℃,第二加热段1300-1350℃,均热段温度1290℃~1330℃。
5.根据权利要求1所述的极限薄规格花纹板的制造方法,其特征在于:所述粗轧后投用中间辊道保温罩及热卷箱。
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