CN105256231B - 冷凝管用冷轧钢板及其制备方法 - Google Patents
冷凝管用冷轧钢板及其制备方法 Download PDFInfo
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- CN105256231B CN105256231B CN201510765656.7A CN201510765656A CN105256231B CN 105256231 B CN105256231 B CN 105256231B CN 201510765656 A CN201510765656 A CN 201510765656A CN 105256231 B CN105256231 B CN 105256231B
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- cold
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- slab
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- 239000010960 cold rolled steel Substances 0.000 title claims abstract description 18
- 238000002360 preparation method Methods 0.000 title claims description 3
- 238000000137 annealing Methods 0.000 claims abstract description 41
- 239000000203 mixture Substances 0.000 claims abstract description 14
- 238000004519 manufacturing process Methods 0.000 claims abstract description 12
- 239000012535 impurity Substances 0.000 claims abstract description 11
- 239000000126 substance Substances 0.000 claims abstract description 11
- 229910000831 Steel Inorganic materials 0.000 claims description 30
- 239000010959 steel Substances 0.000 claims description 30
- 238000005096 rolling process Methods 0.000 claims description 27
- 238000001816 cooling Methods 0.000 claims description 18
- 238000010438 heat treatment Methods 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 14
- 238000005097 cold rolling Methods 0.000 claims description 12
- 238000005266 casting Methods 0.000 claims description 8
- 238000010583 slow cooling Methods 0.000 claims description 8
- 238000009413 insulation Methods 0.000 claims description 3
- 102220068392 rs6921145 Human genes 0.000 claims 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances data:image/svg+xml;base64,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 data:image/svg+xml;base64,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 [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 19
- 238000009749 continuous casting Methods 0.000 description 6
- 238000003723 Smelting Methods 0.000 description 5
- 230000003009 desulfurizing Effects 0.000 description 5
- 229910052742 iron Inorganic materials 0.000 description 5
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 4
- 239000002585 base Substances 0.000 description 4
- 238000004140 cleaning Methods 0.000 description 3
- 239000003513 alkali Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N carbon Chemical compound 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Abstract
本发明属于冷轧板带生产技术领域，特别是涉及一种连续退火方式生产冷凝管用冷轧钢板的生产方法。本发明提供一种冷凝管用冷轧钢板，其化学成分按重量百分比组成为：C：0.0010～0.0030％，Si：0.010～0.014％，Mn：0.06～0.10％，P：0.004～0.010％，S：0.003～0.015％，Ti：0.050～0.070％，Als：0.028％～0.055％，余量为Fe和不可避免杂质组成。所述冷凝管用冷轧钢板的屈服强度120～160MPa，抗拉强度280～340MPa，延伸率A80≥39％，
Description
冷凝管用冷轧钢板及其制备方法
技术领域
[0001] 本发明属于冷乳板带生产技术领域，特别是涉及一种连续退火方式生产冷凝管用 冷乳钢板的生产方法。
背景技术
[0002] 冷凝管属于精密焊管，被广泛应用于制冷、汽车、电热电器等工业中，出于降低成 本的考虑逐渐用冷乳钢带来替代紫铜管，2009年6月25日公布并于2010年4月1日开始使用 专用的国标GB/T 24187-2009。处于更好的开发此类产品进行探索，此次探索以超低碳钢为 考量基础，连续退火生产超低碳钢钢板代表性的专利有以下2项：
[0003] (1) 201010224464.2—种
的IF钢及其生产方法
[0004] 本发明涉及一种
的汽车用IF钢及生产方法。其化学组分及重量百分比：
〜0.06^18:0.015〜0.07、3:〈0.015、1〈0.005，其余为?6及不可避免的杂质；步骤:冶炼并 连铸成坯;将连铸坯加热;粗乳;精乳;卷取;冷乳;连续退火;冷却;进行光整并待用。本发明 可替代传统的超低碳Ti-IF钢，具有良好得深冲性能及较低的Δ H直，焊接性能优异。所得汽 车零件质量优异、外表美观，减少了“凸耳”或冲裂等缺陷的发生。
[0005] (2) 201110393370.2—种含钛IF钢及退火工艺
[0006] —种含钛IF钢的退火工艺，属于冶金及热处理技术领域;其化学成分及重量百分 比含量为：
0.041-0.06%，Nb: 0.001-0.003%，其余为Fe和无法检测的微量杂质；退火工艺制度一:连 续加热，保温处理后随炉冷却至一定温度后出炉空冷;退火工艺制度二：到温入炉，短时保 温后出炉空冷。通过两种工艺均可获得优异深冲性能的IF钢，由退火工艺制度一处理后的 IF钢试样具有优异的深冲性能，抗拉强度达到290-310MPa，屈服强度100-155MPa，应变硬化 指数平面各向异性度
：由退火工艺制度二处理后的IF钢试样具有良好的成型性， 抗拉强度达到290-310MPa，屈服强度115-160MPa，应变硬化指数平面各向异性度
发明内容
[0007] 本发明的目的在于提供一种冷凝管用冷乳钢板，所得钢板的符合屈服强度120〜 160MPa，抗拉强度280〜340MPa，伸长率
的要求。
[0008] 本发明的技术方案：
[0009] 本发明提供一种冷凝管用冷乳钢板，其化学成分按重量百分比组成为:C:0.0010 〜0.0030%，Si :0.010〜0.014%，Μη:0·06〜0· 10%，Ρ:0·004〜0.010%，S:0.003〜 0.015%，Ti:0.050〜0.070%，Als:0.028%〜0.055%，余量为Fe和不可避免杂质组成。
[0010] 优选的，所述冷凝管用冷乳钢板的化学成分按重量百分比组成为：c:0.0020%， Si:0.012%，Μη:0·09%，P:0.005%，S:0.005%，Ti:0.064%，Als:0.028%，余量为Fe和不 可避免杂质组成。
[0011] 优选的，所述冷凝管用冷乳钢板的化学成分按重量百分比组成为：c:o.0010%， Si:0.012%，Μη:0·06%，P:0.004%，S:0.003%，Ti:0.070%，Als:0.038%，余量为Fe和不 可避免杂质组成。
[0012] 进一步，上述冷凝管用冷乳钢板的屈服强度120〜160MPa，抗拉强度280〜340MPa， 由于后续有拉拔工序要求高的伸长率，故采用软钢用的
[0013] 本发明还提供上述冷凝管用冷乳钢板的生产方法，包括将钢水连铸成板坯，然后 将所述板坯依次进行加热、粗乳、精乳、层流冷却、卷取、冷乳和退火处理、冷却及光整，其 中，
[0014] 所述加热温度控制在1210°C〜1250°C，加热保温时间为180〜240min;
[0015] 精乳过程中开乳温度1020〜1070°C，精乳终乳温度控制在910°C〜950°C ;
[0016] 卷取温度控制在730〜770°C;
[0017] 冷乳过程中冷乳压下率控制在76%〜83.3%;
[0018] 退火处理过程中：采用连续退火炉退火，连续退火炉的机组速度为120〜280m/ min，退火温度为830〜850 °C;连续退火炉的缓冷终点温度、快冷终点温度、过时效结束温度 分别控制在660〜680°C、420〜440°C和400-420°C。
[0019] 进一步，所述板坯粗乳后中间坯的厚度为38_〜42_。
[0020] 进一步，所述板还精乳后的厚度为3〜4.8mm。
[0021] 进一步，卷取后热乳板通过碱洗清洗干净。
[0022] 进一步，光整工序中光整延伸率控制在0.4〜0.8 %。
[0023] 本发明的有益效果：
[0024] 本发明提供一种制造工艺实施难度小，表面质量和综合性能优良，可在连续退火 机组上实现批量生产的一种高强度且表面质量好、板形优良的低碳钢冷乳钢板的生产方 法。所得冷凝管用冷乳钢板的屈服强度120〜160MPa，抗拉强度280〜340MPa，伸长率A80彡 39%
附图说明
[0025] 图1为实施例1热乳过程中试验钢的金相显微组织。由图1可以看出：晶粒尺寸大小 差异小，晶粒度级别为8.5级。
[0026] 图2为实施案例1成品的金相组织，由图2可看出，晶粒尺寸大小均匀基本呈等轴 状，说明再结晶完全且晶粒级别为9.0级同时在组织内能未看到点状的碳化物，经判别其游 离渗碳体级别为〇级。
具体实施方式
[0027] 本发明选择工艺范围的原因如下：按通常铁水脱硫、转炉冶炼、LF炉Ca处理，RH脱 碳及合金化，将钢水成分控制在上述范围内，浇铸成连铸坯，加热至1210°C〜1250°C，在炉 时间180〜240min，进行粗乳。热乳中间板还厚度在38mm〜42mm，热乳精乳开乳温度1020 °C 〜1070°C，终乳温度范围为910°C〜950°C;精乳后以前段冷却的层流冷却方式冷却到730〜 770 °C进行卷取。热乳板的厚度3.0〜4.8mm。热乳板经碱洗清洗干净后，在结合冷乳机的能 力，确定为76%〜83.3%。乳后卷在连续退火炉的机组速度为120〜280m/min，在均热段将 钢板加热和830〜850°C ;在连续退火炉的缓冷终点、快冷终点、过时效结束的带钢温度分别 控制在660〜680°C、420〜440°C和400-420°C ;将带钢经过水液槽冷却至室温，进行光整，延 伸率控制在0.4〜0.5%。
[0028] 下面结合实施例对本发明的具体实施方式做进一步的描述，并不因此将本发明限 制在所述的实施例范围之中。
[0029] 实施例1
[0030] 按通常铁水脱硫、转炉冶炼、LF炉Ca处理，RH脱碳，连铸成的连铸坯，化学成分为C: 0.0020%，Si :0.012%，Mn:0.09%，P:0.005%，S:0.005%，Ti :0.064%，Als:0.028%，余量 为Fe和不可避免杂质组成。将板坯加热至1233°C进行粗乳，在炉时间225min，粗乳后中间板 坯厚度在38mm，精乳开乳温度1055°C，终乳温度为940°C，卷取温度为758°C，热乳板的厚度 3.0mm。冷乳压下率为83.3 %，冷乳板厚度为0.50mm。乳后卷在连续退火炉的机组速度为 184m/min，在加热段将钢板加热到832°C ;在连续退火炉的缓冷终点、快冷终点、过时效结束 的带钢温度分别控制在680 °C、440 °C和400 °C ;光整延伸率控制在0.53 %。
[0031] 所得钢板的屈服强度、抗拉强度、伸长率、
.分别为124MPa、298MPa、45%、 0.23、2.2。所述钢板的屈服强度〇^〇、抗拉强度(伽)、延伸率仏％)均按照68/^228.1-2010 规定的方法进行检测；
通过GB/T 5028-2008检测、
公式计算得到J通 过GB/T5027-2007检测、
公式计算得到。
[0032] 实施例2
[0033] 按通常铁水脱硫、转炉冶炼、LF炉Ca处理，RH脱碳，连铸成的连铸坯，化学成分为C: 0.0010%，Si :0.012%，Mn:0.06%，P:0.004%，S:0.003%，Ti :0.070%，Als:0.038%，余量 为Fe和不可避免杂质组成。将板坯加热至1232°C进行粗乳，在炉时间247min，粗乳后中间板 坯厚度在42mm，精乳开乳温度1050°C，终乳温度为920°C，卷取度为745°C，热乳板的厚度 4.0mm。冷乳压下率为80%，冷乳板厚度为0.794mm。乳后卷在连续退火炉的机组速度为 132m/min，在加热段将钢板加热到838.7°C ;在连续退火炉的缓冷终点、快冷终点、过时效结 束的带钢温度分别控制在671.4°C、431.3°C和411.1°C ;光整延伸率控制光整延伸率控制在 0.50 %。所得钢板的屈服强度、抗拉强度、伸长率、
分别为136MPa、297MPa、46 %、0.22、 2.5〇
[0034] 对比例I
[0035] 按通常铁水脱硫、转炉冶炼、LF炉Ca处理，RH脱碳，连铸成的连铸坯，化学成分为C: 0.007%，Si :0.01 %，Μη:0· 15%，P:0.008%，S:0.006%，Als:0.038%，余量为Fe和不可避 免杂质组成。将板坯加热至1233°C进行粗乳，在炉时间217min，粗乳后中间板坯厚度在 4〇111111，精乳开乳温度1013°(：，终乳温度为885°(：，卷取度为744°(：，热乳板的厚度3.2111111。冷乳 压下率为78%，冷乳板厚度为0.70_。乳后卷在连续退火炉的机组速度为117m/min，在加热 段将钢板加热到831°C ;在连续退火炉的缓冷终点、快冷终点、过时效结束的带钢温度分别 控制在683 °C、395 °C和366 °C;光整延伸率控制光整延伸率控制在0.90 %。所得钢板的屈服 强度、抗拉强度、伸长率、
分别为176MPa、302MPa、43.5%、0.19、2.0。
[0036] 对比例2
[0037] 按通常铁水脱硫、转炉冶炼、LF炉Ca处理，RH脱碳，连铸成的连铸坯，化学成分为C: 0.019%，Si:0.006%，Mn:0.17%，P:0.011%，S:0.006%，Als:0.036%，余量为Fe和不可避 免杂质组成。将板坯加热至1225 °C进行粗乳，在炉时间244min，粗乳后中间板坯厚度在 40mm，精乳开乳温度984°C，终乳温度为883°C，卷取度为751°C，热乳板的厚度4.0mm。冷乳压 下率为77.5%，冷乳板厚度为0.9_。乳后卷在连续退火炉的机组速度为112111/1^11，在加热 段将钢板加热到833 °C ;在连续退火炉的缓冷终点、快冷终点、过时效结束的带钢温度分别 控制在675 °C、407 °C和377 °C;光整延伸率控制光整延伸率控制在0.95 %。所得钢板的屈服 强度、抗拉强度、伸长率、
分别为203MPa、323MPa、42%、0.18、1.9。
Claims (2)
1. 冷凝管用冷乳钢板，其特征在于，其化学成分按重量百分比组成为:C: 0.0020 %，Si : 0.012%，Μη:0·09%，Ρ:0.005%，S:0.005%，Ti :0.064%，Als:0.028%，余量为Fe和不可避 免杂质组成;所述冷凝管用冷乳钢板屈服强度为124MPa，抗拉强度为298MPa，延伸率A80 = 45%,n = 0.23,r = 2.2； 其制备方法为:将钢水连铸成板坯，然后将所述板坯依次进行加热、粗乳、精乳、层流冷 却、卷取、冷乳和退火处理、冷却及光整， 所述加热温度控制在1233°C，加热保温时间为225min; 板坯粗乳后中间坯的厚度为38mm; 精乳过程中开乳温度1055°C，精乳终乳温度控制在940 °C;板坯精乳后的厚度为3.0mm; 卷取温度控制在758 °C; 冷乳过程中冷乳压下率控制在83.3 %，冷乳板厚度为0.50mm; 退火处理过程中：采用连续退火炉退火，连续退火炉的机组速度为184m/min，退火温度 为832°C;连续退火炉的缓冷终点温度、快冷终点温度、过时效结束温度分别控制在680°C、 440°C 和400°C; 光整延伸率为0.53 %。
2. 权利要求1所述冷凝管用冷乳钢板的生产方法，包括将钢水连铸成板坯，然后将所述 板坯依次进行加热、粗乳、精乳、层流冷却、卷取、冷乳和退火处理、冷却及光整，其特征在 于， 所述加热温度控制在1233°C，加热保温时间为225min; 板坯粗乳后中间坯的厚度为38mm; 精乳过程中开乳温度1055°C，精乳终乳温度控制在940 °C;板坯精乳后的厚度为3.0mm; 卷取温度控制在758 °C; 冷乳过程中冷乳压下率控制在83.3 %，冷乳板厚度为0.50mm; 退火处理过程中：采用连续退火炉退火，连续退火炉的机组速度为184m/min，退火温度 为832°C;连续退火炉的缓冷终点温度、快冷终点温度、过时效结束温度分别控制在680°C、 440°C 和400°C; 光整延伸率为0.53 %。
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