CN107413848A - 一种冷轧钢板的制备方法 - Google Patents
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- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
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- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- 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
- 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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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- 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
- 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
- C21D8/0236—Cold rolling
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- 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
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0081—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for slabs; for billets
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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
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
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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
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
- B21B2001/221—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length by cold-rolling
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
- B21B2001/225—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length by hot-rolling
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2261/00—Product parameters
- B21B2261/20—Temperature
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2271/00—Mill stand parameters
- B21B2271/02—Roll gap, screw-down position, draft position
Abstract
一种冷轧钢板的制备方法,该方法包括:将板坯依次经过热轧、卷取、冷轧、退火、光整和拉矫,其特征在于,在所述热轧之后且在所述卷取之前,先以75‑95℃/s的冷却速度将热轧后得到的中间板坯冷却至770‑840℃后,再以19‑29℃/s的冷却速度冷却至卷取的温度;所述卷取的温度为710~740℃;所述冷轧的压下率为70~85%;所述退火的方式为连续退火,所述退火过程中,冷轧后得到的中间板坯依次经过加热段、均热段、一次冷却段、过时效段和二次冷却段,所述热轧包括粗轧和精轧。
Description
技术领域
本发明属于冶金领域,特别是涉及一种冷轧钢板的制备方法。
背景技术
最近,出于保护地球环境的问题,对排出气体进行限制,与此相关,减轻汽车车身重量成为极重要的课题。为了减轻汽车车身重量,使大量使用的钢板强度增加,也就是说,使用高强度钢板,对所使用的钢板进行减薄是有效的。
此外,在制作汽车零件的过程中,要对钢板进行冲压成形,因此,在钢板的强度过高时,会产生以下问题:(1)形状冻结性降低,(2)因为延性降低,在成形时发生裂纹或缩颈等缺陷,这些阻碍了对汽车车身扩大使用高强度钢板。
目前,作为制备特超深冲冷轧钢板的方法,钢板在退火前经过清洗,进入连续退火炉,采用氮氢混合气体喷出钢板表面,对钢板进行保护、防止氧化,同时使钢板两次加热;然后对钢板进行冷却并保温进行过时效处理,随后冷却至常温。由于采用过时效退火工艺,使钢中的碳化物得到充分析出,保证了家电钢板和汽车板冲压性能和超深冲性能。但是,通过该工艺获得的钢板的冲压成型性能还需要进一步提高。
发明内容
本发明的目的在于提供一种屈服强度在140-180MPa范围内,且成形性能优良的高塑性应变比值的冷轧钢板及其制备方法。
通过深入的研究发现:通过控制板坯组成成分、热轧、冷轧、退火等工序,特别是在热轧中对冷却速度的控制、冷轧中的压下率的控制、连续退火过程中对各个处理段的温度进行控制,细化并稳定铁素体晶体尺寸,从而可得到一种屈服强度在140-180MPa范围内,且成形性能优良的高塑性应变比值的冷轧钢板,由此完成了本发明。
即,本发明提供一种冷轧钢板的制备方法,该方法包括:将板坯依次经过热轧、卷取、冷轧、退火、光整和拉矫,其特征在于,
在所述热轧之后且在所述卷取之前,先以75-95℃/s的冷却速度将热轧后得到的中间板坯冷却至770-840℃后,再以19-29℃/s的冷却速度冷却至卷取的温度;
所述卷取的温度为710~740℃;
所述冷轧的压下率为70~85%;
所述退火的方式为连续退火,所述退火过程中,冷轧后得到的中间板坯依次经过加热段、均热段、一次冷却段、过时效段和二次冷却段,所述加热段的温度为780~800℃,加热时间200~350s;均热段的温度为810~860℃,均热时间70~120s;冷轧后得到的中间板坯在所述一次冷却段、过时效段和二次冷却段的终点温度分别为670~700℃、370~400℃、410~460℃,停留时间分别为60~110s、15~20s、170~450s;
所述热轧包括粗轧和精轧,所述粗轧的开轧温度为1200℃~1230℃,所述粗轧的终轧温度为1090-1150℃,粗轧时间200~300min;所述精轧的开轧温度为1000℃~1070℃,所述精轧的终轧温度为910℃~940℃。
优选的,在所述热轧之后且在所述卷取之前,先以76-89℃/s的冷却速度将热轧后得到的中间板坯冷却至800-815℃后,再以20-25℃/s的冷却速度冷却至卷取的温度。
优选的,所述板坯的组成为碳:0.0010~0.0060%,硅:≤0.05%,锰:0.50~1.0%,磷:0.06~0.10%,硫:≤0.010%,钛:0.01~0.05%,硼:0.001~0.002%,余量为铁和不可避免杂质组成。
优选的,所述粗轧后的中间板坯的厚度为50mm~40mm。
优选的,所述精轧后的中间板坯的厚度为4~7mm。
优选的,所述卷取的温度为740-765℃。
优选的,所述冷轧的压下率为75-83%。
优选的,所述光整延伸率为0.2~0.8%。
采用本发明的制备方法制备的冷轧钢板,其成品力学性能达到屈服强度为140-180MPa,是一种特别适用于汽车、摩托车领域整体冲压成型零部件的钢板,具有优良的市场前景。
具体实施方式
实施例1
一种冷轧钢板的制备方法,先以80℃/s的冷却速度将热轧后得到的中间板坯冷却至800℃后,再以25℃/s的冷却速度冷却至卷取的温度;
所述卷取的温度为720℃;
所述冷轧的压下率为75%;
所述退火的方式为连续退火,所述退火过程中,冷轧后得到的中间板坯依次经过加热段、均热段、一次冷却段、过时效段和二次冷却段,所述加热段的温度为790℃,加热时间250s;均热段的温度为830℃,均热时间100s;冷轧后得到的中间板坯在所述一次冷却段、过时效段和二次冷却段的终点温度分别为690℃、390℃、450℃,停留时间分别为90s、16s、300s;
所述热轧包括粗轧和精轧,所述粗轧的开轧温度为1220℃,所述粗轧的终轧温度为1119℃,粗轧时间279min;所述精轧的开轧温度为1061℃,所述精轧的终轧温度为925℃。
在本发明中,板坯的组成为:板坯的组成为碳:0.0010~0.0060%,硅:≤0.05%,锰:0.50~1.0%,磷:0.06~0.10%,硫:≤0.010%,钛:0.01~0.05%,硼:0.001~0.002%,余量为铁和不可避免杂质组成。所述板坯的组成成分在上述范围内时,可以在经过本发明的热轧、卷取、冷轧、退火、光整和拉矫工艺后,将制得强度和成形性能更好的冷轧钢板。
Claims (8)
1.一种冷轧钢板的制备方法,该方法包括:将板坯依次经过热轧、卷取、冷轧、退火、光整和拉矫,其特征在于,
在所述热轧之后且在所述卷取之前,先以75-95℃/s的冷却速度将热轧后得到的中间板坯冷却至770-840℃后,再以19-29℃/s的冷却速度冷却至卷取的温度;
所述卷取的温度为710~740℃;
所述冷轧的压下率为70~85%;
所述退火的方式为连续退火,所述退火过程中,冷轧后得到的中间板坯依次经过加热段、均热段、一次冷却段、过时效段和二次冷却段,所述加热段的温度为780~800℃,加热时间200~350s;均热段的温度为810~860℃,均热时间70~120s;冷轧后得到的中间板坯在所述一次冷却段、过时效段和二次冷却段的终点温度分别为670~700℃、370~400℃、410~460℃,停留时间分别为60~110s、15~20s、170~450s;
所述热轧包括粗轧和精轧,所述粗轧的开轧温度为1200℃~1230℃,所述粗轧的终轧温度为1090-1150℃,粗轧时间200~300min;所述精轧的开轧温度为1000℃~1070℃,所述精轧的终轧温度为910℃~940℃。
2.根据权利要求1所述的冷轧钢板的制备方法,其特征在于,在所述热轧之后且在所述卷取之前,先以76-89℃/s的冷却速度将热轧后得到的中间板坯冷却至800-815℃后,再以20-25℃/s的冷却速度冷却至卷取的温度。
3.根据权利要求1所述的冷轧钢板的制备方法,其特征在于,所述板坯的组成为碳:0.0010~0.0060%,硅:≤0.05%,锰:0.50~1.0%,磷:0.06~0.10%,硫:≤0.010%,钛:0.01~0.05%,硼:0.001~0.002%,余量为铁和不可避免杂质组成。
4.根据权利要求1或2所述的冷轧钢板的制备方法,其特征在于,所述粗轧后的中间板坯的厚度为50mm~40mm。
5.根据权利要求4所述的冷轧钢板的制备方法,其特征在于,所述精轧后的中间板坯的厚度为4~7mm。
6.根据权利要求5所述的冷轧钢板的制备方法,其特征在于,所述卷取的温度为740-765℃。
7.根据权利要求6所述的冷轧钢板的制备方法,其特征在于,所述冷轧的压下率为75-83%。
8.根据权利要求7所述的冷轧钢板的制备方法,其特征在于,所述光整延伸率为0.2~0.8%。
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CN104611535A (zh) * | 2015-02-06 | 2015-05-13 | 攀钢集团攀枝花钢铁研究院有限公司 | 一种冷轧钢板及其制备方法 |
CN105755370A (zh) * | 2016-05-23 | 2016-07-13 | 攀钢集团攀枝花钢铁研究院有限公司 | 一种超低碳冷轧钢板及其生产方法 |
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