CN111804729A - 一种通过高性能预压下钢材板坯生产中特厚板的方法 - Google Patents
一种通过高性能预压下钢材板坯生产中特厚板的方法 Download PDFInfo
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Abstract
本发明提供了一种通过高性能预压下钢材板坯生产中特厚板的方法,包括如下步骤:(1)炼钢,(2)连铸、重压下和高温轧制,(3)加热,(4)控轧控冷,(5)切边打包。本发明采用一种高性能预压下板坯生产中特厚板技术,可以用小轧制力的常规轧机代替原先大轧制力重型轧机生产高性能中特厚板,该工艺避免了为了生产厚钢板,在大轧制力重型中厚板轧机以及所配套的大断面炼钢连铸装备等方面的巨额投资,只需要在原有连铸机上增加一组超重压下装备,通过高温轧制得到高性能、高密度、少缺陷、常规尺寸的预压下板坯。
Description
技术领域
本发明属于钢铁冶炼技术领域,涉及一种通过高性能预压下钢材板坯生产中特厚板的方法。
背景技术
在压力容器、油炼油设备、管线、电力、船舶、海洋平台、低温临氢和耐磨机械等领域用中厚板和特厚板,对探伤、强度、冲击等性能要求极高,目前主要依靠10000吨左右的大型中厚板轧机生产,通过增加板坯断面和低温大压下高压缩比来改善板坯中间的缺陷组织,保证中特厚板的机械性能和探伤指标。但对常规吨位的轧机,由于轧制力小,设备受限,无法通过大压下高压缩比,将大断面板坯轧制成性能合格的中特厚板,而通过投资兴建大吨位轧机或对目前轧机进行改造加大轧机吨位改造,同时配套大断面板坯连铸机,成为当前生产中特厚板的必有之路。但在当前钢铁市场疲软的环境中,需要企业投入大资金,成本较高、风险巨大。
发明内容
本发明针对现有技术存在的问题,提供一种通过高性能预压下钢材板坯生产中特厚板的方法。
为此,本发明采取如下技术方案:
一种通过高性能预压下钢材板坯生产中特厚板的方法,包括以下步骤:
(1)炼钢得到方坯;
(2)通过连铸机对方坯进行连铸,获得截面积分别为:厚度*宽度=300mm*1240mm~1580mm和220mm*1240mm~1580mm的厚板坯,在连铸机上增设超重压下装备,进行连铸后板坯的重压和高温下轧制操作,具体为:对连铸后的板坯,控制其温降,在连铸后板坯最终凝固点附近的变形温度区间内,即板坯心部温度为1250-1450℃的高温粘塑性变形区间内予以重压设备下的轧制变形,将厚度*宽度=300mm*1240mm~1580mm和220mm*1240mm~1580mm的板坯经轧制分别得到规格为220mm *1240~1580mm或160mm *1240~1580mm的高压缩比常规尺寸板坯;
(3)对获得的高压缩比板坯入炉后进行加热;
(4)对加热后的高压缩比板坯控轧控冷,得到板材;
(5)将板材切边后打包。
进一步地,所述步骤(2)中连铸操作中,连铸机结晶器为角部圆弧过渡。
进一步地,所述步骤(3)中对对高压缩比常规尺寸方坯进行三段式加热。
进一步地,所述步骤(4)的控轧控冷操作中,对加热后的高压缩比板坯的再结晶区和未再结晶区分两阶段进行轧制操作,将轧制完成后的板材快速冷却至相变点温度,获得成品板材。
进一步地,步骤(2)中,厚度*宽度=300mm*1240mm~1580mm板坯轧制到220mm*1240~1580mm板坯时,采取轻压下、重压下、小压下、小压下、大压下、大压下、大压下最后小压下平整道次,压下制度为:厚度:
300mm-290mm-295mm-290mm-280mm-265mm-245mm-225mm-218mm。
进一步地,步骤(2)中,厚度*宽度=220mm*1240mm~1580mm板坯轧制到160mm*1240~1580mm板坯时,采取轻压下、重压下、小压下、大压下、大压下、大压下、最后小压下平整道次压下制度为:厚度:
220mm-218mm-215mm-210mm-200mm-185mm-165mm-158mm。
本发明的有益效果在于:
(1)采用一种高性能预压下板坯生产中特厚板技术,可以用小轧制力的常规轧机代替原先大轧制力重型轧机生产高性能中特厚板,该工艺避免了为了生产厚钢板,在大轧制力重型中厚板轧机以及所配套的大断面炼钢连铸装备等方面的巨额投资,只需要在原有连铸机上增加一组超重压下装备,通过高温轧制得到高性能、高密度、少缺陷、常规尺寸的预压下板坯,该板坯再通过常规中厚板轧制工艺,在原先常规轧机上即可获得超出轧机设计厚度规格的中特厚钢板,该技术用最少的投资实现现有轧机厚度规格的扩充,投资少、易操作、易于实现。
(2)采用一种高性能预压下板坯生产中特厚板技术,充分利用了连铸过程中钢坯自身的热量,无需加热,直接从大规格板坯轧制成常规规格板坯,加热炉内只需要将常规规格尺寸的预压下的板坯,而不是大规格的板坯加热到 1200℃,相比较而言,减少了加热时间、能耗和烧损。
(3)利用连铸坯外冷内热的状态,实施高温粘塑性区心部组织的粘塑性变形,实现降低变形能耗,改善铸坯组织。
(4)充分降低了常规轧机的负荷分配,冲较小尺寸的板坯生产在常规轧机上生产高压缩比的板材,不仅提高了产品性能,而且提高了轧机机时产量,降低的生产成本。
具体实施方式
下面结合实施例对本发明做详细解释。
一种通过高性能预压下钢材板坯生产中特厚板的方法,包括如下步骤:
(1)通过常规炼钢操作得到方坯,具体地方坯适用于常规生产的低合金钢,其冶炼成分要求,总合金含量控制不高于3.0%,合金量过高会使得凝固速度降低,从而造成坯壳厚度减薄,在重压下操作中会产生漏钢的风险,冶炼选择优质铁水,经转炉冶炼后到精炼炉,控制有害元素S+P≤0.020%;
(2)对方坯进行连铸操作,连铸所采用的连铸结晶器为角部圆弧过度,连铸时首先采用连铸工艺的钢水进行保护浇铸,浇铸过热度控制在15-30℃,拉坯速率为0.80-1.0m/min,连铸完成后得到规格为截面积为厚度*宽度=160mm*1240mm~1580mm或220mm*1240mm~1580mm的坯板, 然后在连铸机上增设一组重压下装备,进行连铸后板坯的重压和高温下轧制操作,具体地,设置两台超重压下设备,并根据目标厚度和钢坯壳的凝固状态,调节压下装备的压下量和冷却配水制度,通过一组重压下装备,一边压缩,迫使心部夹杂物上浮,提高铸坯的内部纯净度,一边以0.6-1.2m/min外拉,拉出后的厚规格板坯呈现出内热外冷的状态,即坯子内部熔融态-外部凝固形成足够的坯壳,重压下设备一组为两台,第一台为轻压下,第二台为重压下,轻压下到重压下长度2.0-2.5米,然后对重压后的板坯进行高温轧制操作,首先控制其温降,在连铸后板坯最终凝固点附近的变形温度区间内,即板坯心部温度为1250-1450℃的高温粘塑性变形区间内予以重压设备下的轧制变形,即板坯外壳在高温区1050℃-1250℃变形温度区间内开轧,将重压下的厚板坯在一组常规轧机上进行高温粘塑性轧制变形,经历不同轧制道次压下(总共采用5台轧机),采取先小压下因此时板坯温度最高,芯部有部分液态相,如采取大压下会有漏钢的风险产生,小压下可以将夹杂物挤压上浮,破坏枝晶长大,改善坯子内部质量,再大压下,因温度逐步降低,芯部液态相几乎为零,大压下可以将坯子内部缺陷有效压合,然后继续大压下,大压下可以有效的保证轧制力逐步渗透到铸坯内部,最大程度的压合疏松疏空等缺陷改,极大改善内部质量,最后小压下为平整道次,终轧温度950-1150℃;
最终将厚度*宽度=300mm*1240mm~1580mm和220mm*1240mm~1580mm的板坯经轧制分别得到规格为220mm *1240~1580mm或160mm *1240~1580mm的高压缩比常规尺寸板坯;
具体地,对截面积分别为300mm方坯进行重压下 ,将其压到220mm,采取轻压下、重压下、小压下、小压下、大压下、大压下、大压下最后小压下平整道次,压下制度为:
厚度:300mm-290mm-295mm-290mm-280mm-265mm-245mm-225mm-
218mm(表1);
表1 300mm高性能预压下坯压下制度
对截面积分别为220mm方坯进行重压下 ,将其压到160mm,采取轻压下、重压下、小压下、大压下、大压下、大压下、最后小压下平整道次压下制度为:
厚度:220mm-218mm-215mm-210mm-200mm-185mm-165mm-158mm(表2);
表2 220mm高性能预压下坯压下制度
从表1和表2可以看出,该制度中的“轻压下”、“重压下”“小压下”、“大压下”均为自定义,压下量和压下率从小到大,和传统轧制过程中的压下制度截然相反;
(3)对高压缩比常规尺寸板坯进行加热,具体地,对高压缩比常规尺寸方坯进行三段式加热,将其加热到1180-1230℃,保温3.5-4.5小时,加热可用于防止对高压缩比常规尺寸方坯的晶粒粗化;
(4)对加热后的高压缩比常规尺寸板坯控轧控冷,具体地,对加热后高压缩比常规尺寸方坯的再结晶区和未再结晶区分两阶段进行轧制操作,具体地,第一阶段的轧制温度为1050-1100℃,待温厚度为成品规格的2.5-3倍,采取增大控轧厚度的方式来增加低温阶段未再结晶区累计变形带;第二阶段的轧制温度为900-940℃,其中220mm预压下板坯可轧至厚度60-100mm一级探伤成品,160mm预压下板坯可轧至厚度40-60mm一级探伤成品,终轧温度为770-810℃,轧制完成后的钢板会处于奥氏体状态,将奥氏体状态的板材通过气雾冷却方式快速冷却至相变点温度,然后通过空冷的方式冷却至室温,使得硬化态奥氏体充满轧制变形带和位错缺陷,然后即可获得成品板材;
(5)最后将成品板材切边,喷印标记包装入库。
Claims (6)
1.一种通过高性能预压下钢材板坯生产中特厚板的方法,其特征在于,包括以下步骤:
(1)炼钢得到方坯;
(2)通过连铸机对方坯进行连铸,获得截面积分别为:厚度*宽度=300mm*1240mm~1580mm和220mm*1240mm~1580mm的厚板坯,在连铸机上增设超重压下装备,进行连铸后板坯的重压和高温下轧制操作,具体为:对连铸后的板坯,控制其温降,在连铸后板坯最终凝固点附近的变形温度区间内,即板坯心部温度为1250-1450℃的高温粘塑性变形区间内予以重压设备下的轧制变形,将厚度*宽度=300mm*1240mm~1580mm和220mm*1240mm~1580mm的板坯经轧制分别得到规格为220mm *1240~1580mm或160mm *1240~1580mm的高压缩比常规尺寸板坯;
(3)对获得的高压缩比板坯入炉后进行加热;
(4)对加热后的高压缩比板坯控轧控冷,得到板材;
(5)将板材切边后打包。
2.根据权利要求1所述的一种通过高性能预压下钢材板坯生产中特厚板的方法,其特征在于,所述步骤(2)中连铸操作中,连铸机结晶器为角部圆弧过渡。
3.根据权利要求1所述的一种通过高性能预压下钢材板坯生产中特厚板的方法,其特征在于,所述步骤(3)中对对高压缩比常规尺寸方坯进行三段式加热。
4.根据权利要求1所述的一种通过高性能预压下钢材板坯生产中特厚板的方法,其特征在于,所述步骤(4)的控轧控冷操作中,对加热后的高压缩比板坯的再结晶区和未再结晶区分两阶段进行轧制操作,将轧制完成后的板材快速冷却至相变点温度,获得成品板材。
5.根据权利要求1所述的一种通过高性能预压下钢材板坯生产中特厚板的方法,其特征在于,步骤(2)中,厚度*宽度=300mm*1240mm~1580mm板坯轧制到220mm*1240~1580mm板坯时,采取轻压下、重压下、小压下、小压下、大压下、大压下、大压下最后小压下平整道次,压下制度为:厚度:300mm-290mm-295mm-290mm-280mm-265mm-245mm-225mm-218mm。
6.根据权利要求1所述的一种通过高性能预压下钢材板坯生产中特厚板的方法,其特征在于,步骤(2)中,厚度*宽度=220mm*1240mm~1580mm板坯轧制到160mm*1240~1580mm板坯时,采取轻压下、重压下、小压下、大压下、大压下、大压下、最后小压下平整道次压下制度为:厚度:220mm-218mm-215mm-210mm-200mm-185mm-165mm-158mm。
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