CN117385292A - 一种550-750MPa薄规格低合金高强钢的制造方法 - Google Patents
一种550-750MPa薄规格低合金高强钢的制造方法 Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 42
- 239000010959 steel Substances 0.000 title claims abstract description 42
- 229910045601 alloy Inorganic materials 0.000 title claims abstract description 37
- 239000000956 alloy Substances 0.000 title claims abstract description 37
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 18
- 238000005096 rolling process Methods 0.000 claims abstract description 37
- 238000000137 annealing Methods 0.000 claims abstract description 28
- 238000000034 method Methods 0.000 claims abstract description 26
- 238000010438 heat treatment Methods 0.000 claims abstract description 20
- 239000002253 acid Substances 0.000 claims abstract description 12
- 238000002791 soaking Methods 0.000 claims abstract description 10
- 238000009749 continuous casting Methods 0.000 claims abstract description 8
- 238000005098 hot rolling Methods 0.000 claims abstract description 8
- 239000000126 substance Substances 0.000 claims abstract description 5
- 238000009628 steelmaking Methods 0.000 claims abstract description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 16
- 238000010079 rubber tapping Methods 0.000 claims description 12
- DALUDRGQOYMVLD-UHFFFAOYSA-N iron manganese Chemical compound [Mn].[Fe] DALUDRGQOYMVLD-UHFFFAOYSA-N 0.000 claims description 8
- 229910000616 Ferromanganese Inorganic materials 0.000 claims description 7
- 229910052742 iron Inorganic materials 0.000 claims description 7
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 6
- 238000003723 Smelting Methods 0.000 claims description 6
- CYUOWZRAOZFACA-UHFFFAOYSA-N aluminum iron Chemical compound [Al].[Fe] CYUOWZRAOZFACA-UHFFFAOYSA-N 0.000 claims description 6
- 229910052791 calcium Inorganic materials 0.000 claims description 6
- 239000011575 calcium Substances 0.000 claims description 6
- 229910000519 Ferrosilicon Inorganic materials 0.000 claims description 5
- 229910001200 Ferrotitanium Inorganic materials 0.000 claims description 5
- 238000005275 alloying Methods 0.000 claims description 5
- 238000007664 blowing Methods 0.000 claims description 5
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 4
- 229910000592 Ferroniobium Inorganic materials 0.000 claims description 4
- ZFGFKQDDQUAJQP-UHFFFAOYSA-N iron niobium Chemical compound [Fe].[Fe].[Nb] ZFGFKQDDQUAJQP-UHFFFAOYSA-N 0.000 claims description 4
- 238000005070 sampling Methods 0.000 claims description 4
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- 238000005303 weighing Methods 0.000 claims description 4
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- 238000001816 cooling Methods 0.000 claims description 3
- 239000001257 hydrogen Substances 0.000 claims description 3
- 229910052739 hydrogen Inorganic materials 0.000 claims description 3
- XWHPIFXRKKHEKR-UHFFFAOYSA-N iron silicon Chemical compound [Si].[Fe] XWHPIFXRKKHEKR-UHFFFAOYSA-N 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- 230000001681 protective effect Effects 0.000 claims description 3
- 229910052786 argon Inorganic materials 0.000 claims description 2
- 238000004140 cleaning Methods 0.000 claims description 2
- 238000005097 cold rolling Methods 0.000 claims description 2
- 230000003009 desulfurizing effect Effects 0.000 claims description 2
- 238000001035 drying Methods 0.000 claims description 2
- 239000012535 impurity Substances 0.000 claims description 2
- 238000007689 inspection Methods 0.000 claims description 2
- 238000004806 packaging method and process Methods 0.000 claims description 2
- 238000003756 stirring Methods 0.000 claims description 2
- 238000005406 washing Methods 0.000 claims description 2
- 238000005266 casting Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 2
- JMAHHHVEVBOCPE-UHFFFAOYSA-N [Fe].[Nb] Chemical compound [Fe].[Nb] JMAHHHVEVBOCPE-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 239000011572 manganese Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000005554 pickling Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
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- C—CHEMISTRY; METALLURGY
- 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
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/06—Deoxidising, e.g. killing
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- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/064—Dephosphorising; Desulfurising
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- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
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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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- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
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- 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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- 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550‑750MPa薄规格低合金高强钢的制造方法，包括：炼钢工序；热轧工序；酸轧工序；连退工序；其中退火工艺参数：(1)550MPa级低合金高强钢加热和均热段温度830±10℃，退火速度120‑150m/min；(2)650MPa级低合金高强钢加热和均热段温度770±10℃，退火速度130‑170m/min；(3)750MPa级低合金高强钢加热和均热段温度720±10℃，退火速度130‑170m/min。本发明的制造方法，其化学成分一致，可实现不同钢级连续浇注，成分设计含量较低，轧机负荷低，能够轧制厚度较薄的钢带，厚度范围0.6‑1.0mm。
Description
技术领域
本发明涉及冶金材料领域，尤其涉及一种550-750MPa薄规格低合金高强钢的制造方法。
背景技术
随着行业的发展，汽车行业对材料的要求日益提高，汽车轻量化是产业未来发展的必由之路，降低车重的最好办法是使用高强度钢板，另一方面高强度钢板还会提高汽车的抗凹陷性和抗冲击强度，增加了汽车的使用寿命和安全性。冷轧低合金高强钢通过添加Mn、Nb、Ti等合金元素实现强度提升，在汽车结构件和加强板中占主要比例，开发强度级别较高，钢板厚度较薄的钢带应用前景广阔。
目前市场上冷轧低合金高强钢均通过调整合金成分实现不同强度等级的开发，冶炼过程造成的浪费较高，由于成分差异导致强度等级不同的低合金高强钢不能连续浇注，并且冶炼过程产生较多的混浇坯无法使用。此外采用不同成分设计提高了酸洗连轧机组轧机轧制负荷，对于强度较高的钢级，轧制难度大，容易导致板型不良、厚度超差、断带等诸多问题。
发明内容
本发明的目的是提供一种550-750MPa薄规格低合金高强钢的制造方法，其化学成分一致，可实现不同钢级连续浇注，成分设计含量较低，轧机负荷低，能够轧制厚度较薄的钢带，厚度范围0.6-1.0mm。
为解决上述技术问题，本发明采用如下技术方案：
一种550-750MPa薄规格低合金高强钢的制造方法，其质量百分比的化学成分：C≤0.09％；Si≤0.2％；Mn≤1.2％；P≤0.015；S≤0.008；Al≤0.040；Nb≤0.04％；Ti：0.050-0.090％；N≤50ppm，其余为Fe及不可避免夹杂；其制造方法包括：
炼钢工序：铁水→转炉炼钢→LF精炼→板坯连铸；转炉冶炼采用KR预脱硫铁水，硅铁、锰铁、铌铁和钛铁合金脱氧合金化，钢水全过程吹氩搅拌；
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→飞剪→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***→取样、检验；其板坯加热温度为1220-1270℃；加热时间180-300min；粗轧模式采用3+3；精轧终轧温度850-920℃，卷取温度为500-600℃，热轧厚度2.5-2.7mm；
酸轧工序：酸轧开卷→焊接→拉矫→酸洗→漂洗→烘干→切边→连轧机冷轧→分切→卷取→离线检查→称重→标识→打捆→包装→入库；酸轧厚度0.6-1.0mm；
连退工序：连退开卷→焊接→清洗→入***套→退火炉→出***套→平整→检查活套→切边→表面检查→涂油→卷取→称重→取样、检验；其中退火工艺参数：(1)550MPa级低合金高强钢加热和均热段温度830±10℃，退火速度120-150m/min；(2)650MPa级低合金高强钢加热和均热段温度770±10℃，退火速度130-170m/min；(3)750MPa级低合金高强钢加热和均热段温度720±10℃，退火速度130-170m/min。
进一步的，转炉终点出钢温度≥1620℃，保证成分与温度协调出钢，出钢温度1600-1640℃；转炉出钢过程中加入铝铁、锰铁及硅铁等合金进行脱氧合金化。
进一步的，LF炉造渣脱硫，并加入铝铁、硅铁、锰铁、铌铁、钛铁合金调整成分至目标值；LF处理结束后进行钙处理，钙处理后保证软吹时间在8分钟以上。
进一步的，连铸：过热度25-40℃，拉速控制在1.0-1.8m/min。
进一步的，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。
进一步的，热轧厚度2.5-2.7mm。
进一步的，0.6mm≤成品厚度≤1.0mm。
与现有技术相比，本发明的有益技术效果：
本发明提供了一种550-750MPa级薄规格冷轧低合金高强钢的制造方法，其化学成分一致，可实现不同钢级连续浇注，成分设计含量较低，轧机负荷低，能够轧制厚度较薄的钢带，厚度范围0.6-1.0mm。且性能优异。
具体实施方式
一种550-750MPa薄规格低合金高强钢的制造方法，包括：
1.冶炼工艺
1.1转炉冶炼：转炉终点出钢温度≥1620℃，保证成分与温度协调出钢，出钢温度1600-1640℃。转炉出钢过程中加入铝铁、锰铁及硅铁等合金进行脱氧合金化。
1.2精炼：LF炉造渣脱硫，并加入铝铁、硅铁、锰铁、铌铁、钛铁合金调整成分至目标值。LF处理结束后进行钙处理，钙处理后保证软吹时间在8分钟以上。
1.3连铸：过热度25-40℃，拉速控制在1.0-1.8m/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，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
| 热轧厚度(mm) | 精轧终轧温度(℃) | 卷取温度(℃) | 冷却方式 |
| 2.5-2.7 | 850-920 | 500-600 | 前分散 |
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，酸轧压下率63％-76％。
表3酸轧轧制规程
| 成品厚度(mm) | 原料厚度(mm) |
| 0.6≤t<0.8 | 2.5 |
| 0.8≤t≤1.0 | 2.7 |
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及速度控制情况见表4。
表4退火工艺
| 屈服强度级别 | 退火加热温度(℃) | 退火均热温度(℃) | 退火速度(m/min) |
| 550MPa级 | 830±10 | 830±10 | 120-150 |
| 650MPa级 | 770±10 | 770±10 | 130-170 |
| 750MPa级 | 720±10 | 720±10 | 130-170 |
5钢带性能
通过以上工艺获得的钢带产品的力学性能情况见表7。
表5：力学性能
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 (7)
1.一种550-750MPa薄规格低合金高强钢的制造方法，其特征在于：其质量百分比的化学成分：C≤0.09％；Si≤0.2％；Mn≤1.2％；P≤0.015；S≤0.008；Al≤0.040；Nb≤0.04％；Ti：0.050-0.090％；N≤50ppm，其余为Fe及不可避免夹杂；其制造方法包括：
炼钢工序：铁水→转炉炼钢→LF精炼→板坯连铸；转炉冶炼采用KR预脱硫铁水，硅铁、锰铁、铌铁和钛铁合金脱氧合金化，钢水全过程吹氩搅拌；
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→飞剪→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***→取样、检验；其板坯加热温度为1220-1270℃；加热时间180-300min；粗轧模式采用3+3；精轧终轧温度850-920℃，卷取温度为500-600℃；
酸轧工序：酸轧开卷→焊接→拉矫→酸洗→漂洗→烘干→切边→连轧机冷轧→分切→卷取→离线检查→称重→标识→打捆→包装→入库；
连退工序：连退开卷→焊接→清洗→入***套→退火炉→出***套→平整→检查活套→切边→表面检查→涂油→卷取→称重→取样、检验；其中退火工艺参数：(1)550MPa级低合金高强钢加热和均热段温度830±10℃，退火速度120-150m/min；(2)650MPa级低合金高强钢加热和均热段温度770±10℃，退火速度130-170m/min；(3)750MPa级低合金高强钢加热和均热段温度720±10℃，退火速度130-170m/min。
2.根据权利要求1所述的550-750MPa薄规格低合金高强钢的制造方法，其特征在于：转炉终点出钢温度≥1620℃，保证成分与温度协调出钢，出钢温度1600-1640℃；转炉出钢过程中加入铝铁、锰铁及硅铁等合金进行脱氧合金化。
3.根据权利要求1所述的550-750MPa薄规格低合金高强钢的制造方法，其特征在于：LF炉造渣脱硫，并加入铝铁、硅铁、锰铁、铌铁、钛铁合金调整成分至目标值；LF处理结束后进行钙处理，钙处理后保证软吹时间在8分钟以上。
4.根据权利要求1所述的550-750MPa薄规格低合金高强钢的制造方法，其特征在于：连铸：过热度25-40℃，拉速控制在1.0-1.8m/min。
5.根据权利要求1所述的550-750MPa薄规格低合金高强钢的制造方法，其特征在于：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。
6.根据权利要求1所述的550-750MPa薄规格低合金高强钢的制造方法，其特征在于：热轧厚度2.5-2.7mm。
7.根据权利要求1所述的550-750MPa薄规格低合金高强钢的制造方法，其特征在于：0.6mm≤成品厚度≤1.0mm。
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