CN116043095A - 一种批量生产全厚度镀锌结构钢的生产方法 - Google Patents

一种批量生产全厚度镀锌结构钢的生产方法 Download PDF

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CN116043095A
CN116043095A CN202211461762.2A CN202211461762A CN116043095A CN 116043095 A CN116043095 A CN 116043095A CN 202211461762 A CN202211461762 A CN 202211461762A CN 116043095 A CN116043095 A CN 116043095A
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structural steel
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敬鑫
路璐
刘野
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Baotou Iron and Steel Group Co Ltd
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    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
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    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
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    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
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    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
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    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/34—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the shape of the material to be treated
    • C23C2/36—Elongated material
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Abstract

本发明公开了一种批量生产全厚度镀锌结构钢的生产方法，镀锌结构钢的质量百分比的化学成分：C0.06～0.08％；Si≤0.05％；Mn0.50～1.50；P≤0.015；S≤0.005；Al≤0.040；N≤50ppm，其余为Fe及不可避免夹杂，质量分数共计为100％，设计合理的生产工艺，保证产品性能符合客户要求，实现批量化生产，具有较好的推广价值。

Description

一种批量生产全厚度镀锌结构钢的生产方法
技术领域
本发明涉及一种批量生产全厚度镀锌结构钢的生产方法。
背景技术
稀土钢板材公司镀锌结构钢在国内多以民用为主，涉及的领域较多，规格需求范围大。镀锌结构钢产品依托全流程(炼钢、热轧、酸轧、镀锌)生产工序，根据下游不同用户使用要求，结合自身工艺调整特点，在充分识别了产线其他产品工艺特点的前提下，制定出了产品生产工艺制度、产品与其他产品过渡工艺原则，实现可批量生产出性能合格且符合客户使用要求的产品是继续解决的问题。
发明内容
本发明的目的是提供一种批量生产全厚度镀锌结构钢的生产方法，通过充分识别客户对产品的要求、产品服役环境、产品检验要求，通过使用添加C、Mn元素和微合金元素保证产品力学性能。同时，通过调整热轧温度制度、酸轧压下率、镀锌炉区工艺温度制度的措施，保证产品成本最优化配置的基础上，实现了可批量生产出性能合格且符合客户使用要求的产品。
为解决上述技术问题，本发明采用如下技术方案：
本发明一种批量生产全厚度镀锌结构钢的生产方法，主要工艺流程包括：
炼钢工序：KR脱硫→转炉冶炼→LF精炼→板坯连铸；
热轧工序：板坯加热→高压水除鳞→定宽压力机→E1R1粗轧机轧制→E2R2粗轧机轧制→保温罩)→飞剪切头尾→高压水除鳞→F1～F7精轧机轧制→加密型层流冷却→卷取→托盘运输系统→称重→入库；其板坯加热温度为1210±25℃；加热时间≥130min；粗轧模式采用3+3或1+5；精轧开轧温度980～1020℃；精轧终轧温度855～885℃，卷取温度为560～620℃；
酸轧工序：酸轧开卷→焊接→拉矫→酸洗→漂洗→烘干→切边→轧制→卷取→称重→标识→打捆→入库；
镀锌工序：热镀锌开卷→焊接→入口活套→清洗→退火炉→锌锅→镀后冷却→水淬→中间活套→光整机→拉伸矫直机→辊涂机→烘干机→空气冷却装置→出口活套→切边→表面检查→涂油→取样、检验→卷取→打捆称重→包装→入库；退火炉使用立式连续退火炉，炉内采用还原性气氛和氮氢混合保护气氛冷却；退火工艺参数：加热和均热段出口温度785～820℃，缓冷段出口温度600～670℃，快冷段出口温度380～450℃，过时效段温度200～350℃，终冷段出口温度≤150℃，平整机延伸率1.0～1.8％；
所述镀锌结构钢其质量百分比的化学成分范围：C 0.06～0.08％；Si≤0.05％；Mn0.50～1.50；P≤0.015；S≤0.005；Al≤0.040；N≤50ppm。其余为Fe及不可避免夹杂，质量分数共计为100％。
进一步的，转炉冶炼：铁水经预处理脱硫进行转炉冶炼，吹氧脱碳升温，冶炼后期加入硅铁、锰铁脱氧合金化，控制P、S成分，防止钢液过氧化，出钢温度≥1620℃，保证成分与温度协调出钢。若新出钢口或非正常周转钢包，出钢温度在上限基础上酌情提高10～15℃，转炉出钢[P]≤0.010％，[S]≤0.010％。
进一步的，精炼：采用LF全程吹氩工艺，精炼过程保持良好的还原气氛，采用Al丝脱氧，LF后期添加锰铁、钛铁进行合金化，LF结束后进行钙处理。
进一步的，连铸：钢水进中包温度控制在1545-1580℃，过热度25～40℃，拉速控制在1.00-1.50m/min。
进一步的，粗轧采用双机架R1和R2往返式轧制，采用的粗轧模式为3+3或1+5，精轧采用F1～F7连轧工艺。
进一步的，酸轧采用F1～F5机架连轧工艺。
与现有技术相比，本发明的有益技术效果：
本发明可以大批量稳定生产全厚度0.5～2.5mm的镀锌结构钢的工艺方法，根据后期使用用途的不同，有效的通过匹配上下游工艺，以最优制造成本生产出合标合用的镀锌结构钢产品，具有较好的推广价值。
附图说明
下面结合附图说明对本发明作进一步说明。
图1为成品金相组织。
具体实施方式
一种批量生产全厚度镀锌结构钢的生产方法，具体包括：
1.冶炼工艺
1.1转炉冶炼：铁水经预处理脱硫进行转炉冶炼，吹氧脱碳升温，冶炼后期加入硅铁、锰铁脱氧合金化，控制P、S成分，防止钢液过氧化，出钢温度≥1620℃，保证成分与温度协调出钢。若新出钢口或非正常周转钢包，出钢温度在上限基础上酌情提高10～15℃，转炉出钢[P]≤0.010％，[S]≤0.010％。
1.2精炼：采用LF全程吹氩工艺，精炼过程保持良好的还原气氛，采用Al丝脱氧，LF后期添加锰铁、钛铁进行合金化，LF结束后进行钙处理。
1.3连铸：钢水进中包温度控制在1545-1580℃，过热度25～40℃，拉速控制在1.00-1.50m/min。
2热轧工艺
采用步进式加热炉加热铸坯(加热工艺见表1)，粗轧采用双机架R1和R2往返式轧制，采用的粗轧模式为3+3或1+5，精轧采用F1～F7连轧工艺，具体热轧工艺见表2。
表1铸坯加热制度
表2轧制工艺
3酸轧工艺
酸轧采用F1～F5机架连轧工艺，不同成品厚度轧制规程见表3。
表3酸轧轧制规程
镀锌成品厚度(mm) 热轧原料厚度(mm)
≥0.50～﹤0.60 2.3
≥0.60～﹤0.70 2.5
≥0.70～﹤0.80 2.8
≥0.80～﹤0.90 3.0
≥0.90～﹤1.00 3.3
≥1.00～﹤1.20 3.5
≥1.20～﹤1.40 3.8
≥1.40～﹤1.60 4.0
≥1.60～﹤1.80 4.3
≥1.80～﹤2.00 4.5
≥2.00～≤2.50 4.8
4退火工艺
退火使用立式连续退火炉，炉内采用还原性气氛和氮氢混合保护气氛冷却。加热炉各段出口温度控制情况见表4，平整机延伸率不同厚度控制情况见表5。
表4退火工艺
表4退火工艺
5实施例分析
5.1炼钢成分
根据以上的炼钢工艺要求，实际板坯化学成分(质量百分比)如下表5所示。
表5实例化学成分
5.2成品性能
基于热轧力学性能，按照以上设计的酸轧工艺和退火工艺生产，成品的室温拉伸力学性能见表7，金相组织为等轴铁素体+少量的珠光体，晶粒度10～11级，组织形貌见图1。
表7成品拉伸性能
综上所述，本产品通过性能检验和用户使用各项性能满足目前市场需求，已经广泛用于民用各种结构件和加强板。主要应用于建筑、电子、轻工、农业等行业。产品多制作方管、圆管、结构面板、电缆桥架、脚手架、防护管道等
以上所述的实施例仅是对本发明的优选方式进行描述，并非对本发明的范围进行限定，在不脱离本发明设计精神的前提下，本领域普通技术人员对本发明的技术方案做出的各种变形和改进，均应落入本发明权利要求书确定的保护范围内。

Claims (6)

1.一种批量生产全厚度镀锌结构钢的生产方法，其特征在于，主要工艺流程包括：
炼钢工序：KR脱硫→转炉冶炼→LF精炼→板坯连铸；
热轧工序：板坯加热→高压水除鳞→定宽压力机→E1R1粗轧机轧制→E2R2粗轧机轧制→保温罩→飞剪切头尾→高压水除鳞→F1～F7精轧机轧制→加密型层流冷却→卷取→托盘运输系统→称重→入库；其板坯加热温度为1210±25℃；加热时间≥130min；粗轧模式采用3+3或1+5；精轧开轧温度980～1020℃；精轧终轧温度855～885℃，卷取温度为560～620℃；
酸轧工序：酸轧开卷→焊接→拉矫→酸洗→漂洗→烘干→切边→轧制→卷取→称重→标识→打捆→入库；
镀锌工序：热镀锌开卷→焊接→入口活套→清洗→退火炉→锌锅→镀后冷却→水淬→中间活套→光整机→拉伸矫直机→辊涂机→烘干机→空气冷却装置→出口活套→切边→表面检查→涂油→取样、检验→卷取→打捆称重→包装→入库；退火炉使用立式连续退火炉，炉内采用还原性气氛和氮氢混合保护气氛冷却；退火工艺参数：加热和均热段出口温度785～820℃，缓冷段出口温度600～670℃，快冷段出口温度380～450℃，过时效段温度200～350℃，终冷段出口温度≤150℃，平整机延伸率1.0～1.8％；
所述镀锌结构钢其质量百分比的化学成分范围：C0.06～0.08％；Si≤0.05％；Mn0.50～1.50；P≤0.015；S≤0.005；Al≤0.040；N≤50ppm。其余为Fe及不可避免夹杂，质量分数共计为100％。
2.根据权利要求1所述的批量生产全厚度镀锌结构钢的生产方法，其特征在于，转炉冶炼：铁水经预处理脱硫进行转炉冶炼，吹氧脱碳升温，冶炼后期加入硅铁、锰铁脱氧合金化，控制P、S成分，防止钢液过氧化，出钢温度≥1620℃，保证成分与温度协调出钢。若新出钢口或非正常周转钢包，出钢温度在上限基础上酌情提高10～15℃，转炉出钢[P]≤0.010％，[S]≤0.010％。
3.根据权利要求1所述的批量生产全厚度镀锌结构钢的生产方法，其特征在于，精炼：采用LF全程吹氩工艺，精炼过程保持良好的还原气氛，采用Al丝脱氧，LF后期添加锰铁、钛铁进行合金化，LF结束后进行钙处理。
4.根据权利要求1所述的批量生产全厚度镀锌结构钢的生产方法，其特征在于，连铸：钢水进中包温度控制在1545-1580℃，过热度25～40℃，拉速控制在1.00-1.50m/min。
5.根据权利要求1所述的批量生产全厚度镀锌结构钢的生产方法，其特征在于，粗轧采用双机架R1和R2往返式轧制，采用的粗轧模式为3+3或1+5，精轧采用F1～F7连轧工艺。
6.根据权利要求1所述的批量生产全厚度镀锌结构钢的生产方法，其特征在于，酸轧采用F1～F5机架连轧工艺。
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