CN112048670A - 表面质量优良的冷轧热镀锌dh590钢及其生产方法 - Google Patents
表面质量优良的冷轧热镀锌dh590钢及其生产方法 Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 84
- 239000010959 steel Substances 0.000 title claims abstract description 84
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 20
- 238000005097 cold rolling Methods 0.000 claims abstract description 19
- 238000000137 annealing Methods 0.000 claims abstract description 18
- 238000005246 galvanizing Methods 0.000 claims abstract description 17
- 238000001816 cooling Methods 0.000 claims abstract description 11
- 238000005096 rolling process Methods 0.000 claims abstract description 11
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 10
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 9
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 8
- 239000012535 impurity Substances 0.000 claims abstract description 6
- 230000009467 reduction Effects 0.000 claims abstract description 6
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 5
- 229910052750 molybdenum Inorganic materials 0.000 claims abstract description 5
- 238000010438 heat treatment Methods 0.000 claims abstract description 4
- 229910052742 iron Inorganic materials 0.000 claims abstract description 4
- 238000005266 casting Methods 0.000 claims abstract description 3
- 238000000034 method Methods 0.000 claims description 16
- 229910001566 austenite Inorganic materials 0.000 claims description 14
- 239000002253 acid Substances 0.000 claims description 12
- 230000008569 process Effects 0.000 claims description 12
- 239000011701 zinc Substances 0.000 claims description 11
- 229910000859 α-Fe Inorganic materials 0.000 claims description 10
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 9
- 238000005098 hot rolling Methods 0.000 claims description 9
- 229910052725 zinc Inorganic materials 0.000 claims description 9
- 229910001563 bainite Inorganic materials 0.000 claims description 7
- 238000009749 continuous casting Methods 0.000 claims description 7
- 238000005554 pickling Methods 0.000 claims description 7
- 239000000126 substance Substances 0.000 claims description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 6
- 238000003723 Smelting Methods 0.000 claims description 6
- 229910000734 martensite Inorganic materials 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 4
- 229910001335 Galvanized steel Inorganic materials 0.000 claims description 3
- 239000008397 galvanized steel Substances 0.000 claims description 3
- 238000007747 plating Methods 0.000 claims description 3
- 230000000717 retained effect Effects 0.000 claims description 3
- 229910001567 cementite Inorganic materials 0.000 claims description 2
- KSOKAHYVTMZFBJ-UHFFFAOYSA-N iron;methane Chemical compound C.[Fe].[Fe].[Fe] KSOKAHYVTMZFBJ-UHFFFAOYSA-N 0.000 claims description 2
- 229910001562 pearlite Inorganic materials 0.000 claims description 2
- 238000005498 polishing Methods 0.000 claims description 2
- 238000007517 polishing process Methods 0.000 claims description 2
- 238000010583 slow cooling Methods 0.000 claims description 2
- 229910052698 phosphorus Inorganic materials 0.000 abstract description 4
- 229910052717 sulfur Inorganic materials 0.000 abstract description 3
- 229910052720 vanadium Inorganic materials 0.000 abstract description 3
- 239000011572 manganese Substances 0.000 description 10
- 239000011651 chromium Substances 0.000 description 8
- 238000005728 strengthening Methods 0.000 description 8
- 229910000885 Dual-phase steel Inorganic materials 0.000 description 6
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- 230000009286 beneficial effect Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 239000000463 material Substances 0.000 description 4
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- 239000010410 layer Substances 0.000 description 3
- 238000001556 precipitation Methods 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
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- 239000010960 cold rolled steel Substances 0.000 description 2
- 238000000354 decomposition reaction Methods 0.000 description 2
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- MTJGVAJYTOXFJH-UHFFFAOYSA-N 3-aminonaphthalene-1,5-disulfonic acid Chemical compound C1=CC=C(S(O)(=O)=O)C2=CC(N)=CC(S(O)(=O)=O)=C21 MTJGVAJYTOXFJH-UHFFFAOYSA-N 0.000 description 1
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 229910000794 TRIP steel Inorganic materials 0.000 description 1
- 229910000797 Ultra-high-strength steel Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052796 boron Inorganic materials 0.000 description 1
- 125000004432 carbon atom Chemical group C* 0.000 description 1
- 239000011247 coating layer Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000001808 coupling effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 229940024464 emollients and protectives zinc product Drugs 0.000 description 1
- -1 exists in a VC form Chemical compound 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 238000001953 recrystallisation Methods 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 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
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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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
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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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- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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Abstract
本发明公开表面质量优良的冷轧热镀锌DH590钢及其生产方法。钢中含有,C:0.10%~0.15%,Mn:1.3%~1.9%,Al:0.02%~0.75%,Si≤0.40%,Cr≤0.2%,Mo≤0.4%,P≤0.03%,S≤0.03%,V≤0.04%,Ti≤0.03%,余量为铁和不可避免的杂质。铸坯加热温度1150~1250℃,开轧温度1000~1120℃,终轧温度在880℃以上,卷取温度500~650℃;冷轧压下率为40%~75%;退火温度750~850℃,退火时间在30~300s之间,镀锌温度450~470℃,镀锌结束后带钢先气刀冷却到400~420℃,随后采用风冷冷却,冷却塔顶辊温度控制在250~300℃;光整延伸率控制在0.2%~0.5%范围内。钢板表面质量优良。
Description
技术领域
本发明属于冷轧钢技术领域,涉及一种汽车用表面质量优良的590MPa级冷轧热镀锌DH钢。
背景技术
在汽车行业,对车身轻量化、排放限制、安全标准均已提出了更高的要求,为了更好地服务用户,汽车行业对成形性高的零配件需求越来越多。传统双相钢难以满足高拉延性的复杂冲杯件要求,TRIP钢由于高合金含量带来昂贵的生产成本而限制了其广泛使用。DH钢是Dual Phase Steels with Improved Formability的英文简称,最早由2016年德国汽车工业协会发布的VDA 239-100冷成形钢板标准中提及。DH钢由于引入一定量的残余奥氏体而具有良好的成形性能,可以克服DP钢和TRIP钢在上述应用过程中存在的不足,进而使得其在未来钢材应用市场中具有显著的优势。
专利文献CN 109402355 A公开了一种600MPa级热轧TRIP型双相钢及其制备方法,其主要化学成分为:C:0.12%~0.14%,Si:0.3%~0.4%,Mn:1.5%~1.7%,Al:0.35%~0.45%,P≤0.014%,生产工艺主要采用热轧工艺,该专利产品塑性较差,A80断后伸长率仅为24%,且表面质量较差。
专利文献CN 103827332 B公开了一种TRIP型马氏体双相钢及使用其的超高强度钢制加工件,其主要化学成分为:C:0.1%~0.7%,Si:0.5%~2.5%,Mn:0.5%~3.0%,Cr:0.5%~2.0%,Mo≤0.5%,Al:0.04%~2.5%,生产工艺主要采用冷轧连退工艺,强度级别1500MPa,该专利合金成本昂贵,表面质量相对较差。
专利文献CN 107747039 A公开了一种高扩孔性能冷轧双相钢及其制备方法,其主要化学成分为:C:0.10%~0.50%,Si:0.1%~0.5%,Mn:1.60%~2.00%,V:0.01%~0.03%,Al:0.02%~0.06%,P≤0.020%,S≤0.015%,N≤0.006%,生产工艺为冷轧连退制度,未涉及热镀锌产品。
发明内容
针对以上现有技术问题,本发明目的在于提供一种表面质量优良的冷轧热镀锌DH590钢及其生产方法,所生产的钢板厚度规格为0.8~2.0mm,通过合理的冶炼成分以及连铸、热轧、酸洗冷轧、连续热浸镀锌工艺控制,杜绝表面氧化铁皮压入破坏产品质量,可实现生产的DH590热镀锌钢板表面质量优良,更容易为广大汽车主机厂接收。
具体的技术方案是:
一种表面质量优良的冷轧热镀锌DH590钢,钢中化学成分(以质量百分比计)含有:C:0.10%~0.15%,Mn:1.3%~1.9%,Al:0.02%~0.75%,Si:0.05%~0.40%,Mo:0.02%~0.4%,Cr:0.02%~≤0.2%,P≤0.03%,S≤0.03%,V≤0.04%,Ti≤0.03%,B≤0.005%,且Si+Al:0.3%~1.2%,余量为铁和不可避免的杂质,钢板沿着平行于轧制方向(纵向)取样,屈服强度为340~420MPa,抗拉强度590~700MPa,A80断后伸长率30%~35%,上下表面粗糙度均在0.9~1.8μm之间;满足汽车用钢的高强高塑要求的同时兼具优良的表面质量。
本发明合金设计的理由如下:
C:碳元素通过固溶强化来保障钢材的强度要求,游离碳可以对奥氏体起到较好的稳定效果,进而改进了钢材的成形性能。C元素含量过低,不能获得本发明中钢材的力学性能;含量过高会使钢材脆化,存在延迟断裂风险。因此,本发明中将C元素的含量控制为0.10%~0.15%。
Mn:锰元素是钢中的奥氏体稳定元素,可以扩大奥氏体相区,降低钢的临界淬火速度,同时,还可以细化晶粒,有助于固溶强化来提高强度。Mn元素含量过低,过冷奥氏体不够稳定,降低钢板的塑性和韧性等加工性能;Mn元素含量过高,会导致钢板焊接性能变差,且生产成本上升,不利于工业化生产。因此,本发明中将Mn元素含量控制为1.3%~1.9%。
Al:铝元素有助于钢液脱氧,还可以抑制残余奥氏体分解和碳化物析出。Al元素含量过高,不仅会提高生产成本,还会导致连铸生产困难等。因此,本发明中将Al元素含量的范围控制在0.02%~0.75%。另外,本发明还控制Si+Al:0.3%~1.2%,主要目的是为了发挥Si、Al的协同作用,从而提高钢材的韧性和塑性。
Si:硅元素在铁素体中具有一定的固溶强化作用,确保钢材具有足够的强度,同时,Si还可以抑制残余奥氏体分解和碳化物析出,减少钢中的夹杂。Si元素含量过低,起不到强化的作用;Si元素含量过高,会降低钢板的表面质量以及焊接性能。因此,本发明中将Si元素的含量控制为Si≤0.4%。
Cr:铬元素可以增加钢的淬透性来保证钢的强度,并可以稳定残余奥氏体,Cr含量过低将影响钢的淬透性,含量过高将增加生产成本。因此,本发明中将Cr元素含量控制在Cr≤0.20%。
Mo:钼元素为钢中的强化元素,有助于稳定残余奥氏体,同时对提高钢的淬透性效果显著,本发明将Mo元素含量的范围控制在Mo≤0.4%。
P:磷元素是钢中的有害元素,严重降低钢材的塑性及变形性能,其含量越低越好。考虑到成本,本发明中将P元素含量控制在P≤0.03%。
S:硫元素是钢中的有害元素,严重影响钢材的成形性,其含量越低越好。考虑到成本,本发明中将S元素含量控制在S≤0.03%。
V:微合金化元素钒主要以VC形式存在,通过细晶强化和弥散强化来提高材料的综合性能,在合金化热镀锌退火加热过程中,未溶解VC颗粒可以钉扎铁素体晶界,从而起到细化晶粒的作用;退火温度增加至两相区时,VC溶解温度较低,故充分溶解于基体中,同时固溶C原子向奥氏体中富集以提高其稳定性;在退火过程中,铁素体中的VC将重新析出,从而生产明显的沉淀强化。因此,在本发明中,可根据实际情况酌情添加不高于0.04%的V元素,为了控制生产成本,亦可不添加V微合金化元素。
Ti:少量添加Ti元素可以细化晶粒尺寸,并显著改善材料的强韧性能,可根据实际情况酌情添加不高于0.03%的Ti。
B:少量的硼元素可以显著改善钢的淬透性,有助于减少其他合金元素,降低合金成本,本发明中B元素含量控制在B≤0.005%。
本发明还提供了一种表面质量优良的冷轧热镀锌DH590钢的生产方法,其特征在于,包括以下步骤:转炉冶炼、板坯连铸、热轧、酸洗冷轧、连续热镀锌。该制备工艺的具体步骤如下:
转炉冶炼:通过转炉进行冶炼,得到按质量百分比计,满足下述成分要求的钢水,C:0.10%~0.15%,Mn:1.3%~1.9%,Al:0.02%~0.75%,Si:0.05%~0.40%,Mo:0.02%~0.4%,Cr:0.02%~≤0.2%,P≤0.01%,S≤0.01%,V≤0.04%,Ti≤0.03%,B≤0.005%,且Si+Al:0.3%~1.2%,余量为铁和不可避免的杂质。
热轧:铸坯入炉温度在400~500℃之间,加热温度在1150~1250℃之间,开轧温度在1000~1120℃之间,终轧温度在880℃以上,卷取温度在500~650℃之间。热轧卷厚度在2~5mm之间,产品热轧态显微组织按体积百分比计,由40%~70%铁素体、20%~40%珠光体,5%~20%贝氏体,1%~5%渗碳体组成。
酸洗冷轧:冷轧前钢卷通过酸液去除表面的氧化铁皮,酸液温度控制在60~95℃,酸液浓度在50~250g/L,冷轧压下率为40%~75%。压下率过高,会导致变形抗力过大,难以轧制到目标厚度;压下率过低,会导致冷轧钢板的延伸率下降。
热浸镀锌:退火温度在750~850℃之间,退火时间在30~300s之间,缓冷出口温度为660~700℃,快速冷却速率大于20℃/s,镀锌温度为450~470℃,镀锌结束后带钢先气刀冷却到400~420℃,随后采用风冷冷却,冷却塔顶辊温度控制在250~300℃;镀液成分含0.16%~0.25%的Al,其余为Zn和不可避免的杂质,镀锌钢板单位面积锌层重量为60~200g/cm2。光整过程的光整延伸率控制在0.2%~0.5%范围内。冷轧热浸镀锌产品的显微组织按体积百分比计,为40%~80%铁素体,10%~50%马氏体,3%~12%残余奥氏体,2%~10%贝氏体组织。
临界区退火温度为750~850℃,若退火温度过高,由于奥氏体化趋于完全而铁素体比例不足,将降低钢材的延展性;如果退火温度过低,最终材料的软相铁素体比例过高会大幅降低材料的强度。退火时间为30~300s,若退火时间过长,会导致钢板晶粒粗大,退火时间过短,钢板来不急完成退火和再结晶过程,导致钢板塑性下降。快冷出口温度为450~470℃,接近锌锅温度便于进行镀锌,出锌锅后带钢气刀冷却至400~420℃,保证锌层表面正常凝固,防止锌液流动;冷却塔顶辊温度控制在250~300℃,可以使锌层凝固完全,避免其粘辊而影响镀层质量。
通过上述方法可以生产出钢板沿纵向取样,屈服强度为340~420MPa,抗拉强度590~700MPa,A80断后伸长率30%~35%,上下表面粗糙度在0.9~1.8μm之间的表面质量优良的热镀锌DH590钢板带。
有益效果:
本发明同现有技术相比,有益效果如下:
(1)本发明采用转炉冶炼—板坯连铸—热轧—酸洗冷轧—连续热浸镀锌的生产工艺,在传统的合金化热镀锌双相钢产线上即可实现DH590冷轧热镀锌产品的工业化生产,具有成本低,不需要添加新的生产设备,生产工艺稳定的优点。
(2)本发明生产的DH590冷轧热镀锌产品是在传统双相钢的基础上引入了残余奥氏体及少量贝氏体,在相变诱导塑性(TRIP)效应辅助和贝氏体协调变形耦合作用下实现高强高塑性的特点。成品组织由40%~80%铁素体,10%~50%马氏体,3%~12%残余奥氏体,2%~10%贝氏体组成。
(3)本发明生产冷轧热镀锌DH590钢产品可实现沿纵向取样屈服强度为340~420MPa,抗拉强度590~700MPa,A80断后伸长率30%~35%,成品厚度为0.8~2.0mm,上下表面粗糙度在0.9~1.8μm之间;满足汽车用钢的高强高塑要求的同时兼具优良的表面质量。
附图说明
图1为实施例1钢板的SEM组织形貌;
图2为实施例1工程应力应变曲线。
具体实施方式
以下实施例用于具体说明本发明内容,这些实施例仅为本发明内容的一般描述,并不对本发明内容进行限制。
表1中列出了实施例钢的化学成分,表2列出了实施例钢的连铸和热轧工艺参数,表3列出了实施例钢冷轧工艺参数,表4给出了实施例钢的热浸镀锌的工艺参数;表5给出了实施例钢的组织;表6给出了实施例钢的力学性能。
表1实施例钢的化学成分,wt%
实施例 | C | Mn | Al | Si | Cr | Mo | P | S | B | V | Ti |
1 | 0.13 | 1.68 | 0.66 | 0.22 | 0.12 | 0.23 | 0.006 | 0.003 | - | - | - |
2 | 0.13 | 1.75 | 0.51 | 0.14 | 0.14 | - | 0.002 | 0.004 | - | 0.015 | - |
3 | 0.12 | 1.84 | 0.67 | 0.34 | 0.03 | 0.34 | 0.001 | 0.003 | - | - | 0.022 |
4 | 0.14 | 1.45 | 0.63 | 0.06 | 0.15 | - | 0.003 | 0.002 | 0.004 | - | - |
5 | 0.15 | 1.38 | 0.36 | 0.05 | 0.02 | 0.12 | 0.002 | 0.001 | - | 0.023 | - |
6 | 0.11 | 1.81 | 0.46 | 0.35 | 0.38 | - | 0.005 | 0.002 | - | 0.028 | 0.024 |
7 | 0.14 | 1.55 | 0.06 | 0.25 | 0.04 | 0.01 | 0.002 | 0.003 | - | 0.014 | - |
8 | 0.13 | 1.72 | 0.02 | 0.33 | 0.19 | - | 0.003 | 0.002 | - | - | - |
9 | 0.14 | 1.60 | 0.54 | 0.08 | 0.13 | 0.27 | 0.002 | 0.004 | - | - | 0.014 |
10 | 0.11 | 1.77 | 0.75 | 0.25 | 0.09 | 0.30 | 0.008 | 0.006 | 0.002 | - | 0.026 |
11 | 0.10 | 1.90 | 0.35 | 0.40 | 0.20 | - | 0.002 | 0.004 | - | 0.032 | - |
12 | 0.13 | 1.63 | 0.44 | 0.27 | 0.05 | - | 0.003 | 0.002 | - | 0.012 | - |
13 | 0.12 | 1.86 | 0.60 | 0.32 | 0.13 | 0.03 | 0.005 | 0.003 | - | 0.010 | 0.012 |
表2实施例钢的连铸和热轧工艺
表3实施例钢的冷轧工艺
实施例 | 热轧卷厚/mm | 酸洗温度/℃ | 酸液浓度/(g·L<sup>-1</sup>) | 冷轧压下率/% |
1 | 2.84 | 88 | 120 | 64 |
2 | 2.56 | 76 | 188 | 55 |
3 | 3.18 | 92 | 56 | 60 |
4 | 3.75 | 68 | 225 | 66 |
5 | 3.12 | 75 | 161 | 52 |
6 | 3.62 | 82 | 147 | 64 |
7 | 2.54 | 90 | 62 | 48 |
8 | 4.32 | 87 | 76 | 72 |
9 | 2.44 | 76 | 178 | 64 |
10 | 3.01 | 81 | 147 | 63 |
11 | 2.25 | 65 | 240 | 55 |
12 | 3.52 | 94 | 55 | 61 |
13 | 2.29 | 89 | 61 | 56 |
表4实施例钢的热浸镀锌工艺
表5实施例钢的组织
表6实施例钢的力学性能及关键参数
由上述实施例可见,采用本发明的成分设计、轧制、热浸镀锌工艺,生产出的冷轧热镀锌DH590钢产品沿纵向取样,可实现屈服强度为340~420MPa,抗拉强度590~700MPa,A80断后伸长率30%~35%,厚度为0.8~2.0mm,上下表面粗糙度均在0.9~1.8μm之间;满足汽车用钢的高强高塑要求的同时兼具优良的表面质量。
Claims (5)
1.一种表面质量优良的冷轧热镀锌DH590钢板,其特征在于,钢中化学成分按质量百分比为:C:0.10%~0.15%,Mn:1.3%~1.9%,Al:0.02%~0.75%,Si:0.05%~0.40%,且Si+Al:0.3%~1.2%,Mo:0.02%~0.4%,Cr:0.02%~≤0.2%,P≤0.03%,S≤0.03%,V≤0.04%,Ti≤0.03%,B≤0.005%,余量为铁和不可避免的杂质,镀液成分含0.16%~0.25%的Al,其余为Zn和不可避免的杂质,热镀锌钢板单位面积锌层重量为60~200g/cm2。
2.根据权利要求1所述的一种表面质量优良的冷轧热镀锌DH590钢板,其特征在于,冷轧热镀锌后成品钢板的显微组织按体积百分比计为,40%~80%铁素体,10%~50%马氏体,3%~12%残余奥氏体,2%~10%贝氏体。
3.根据权利要求1或2所述的一种表面质量优良的冷轧热镀锌DH590钢板,其特征在于,成品钢板沿平行于轧制方向取样,屈服强度为340~420MPa,抗拉强度590~700MPa,A80断后伸长率30%~35%,上下表面粗糙度均在0.9~1.8μm;成品钢板厚度为0.8~2.0mm。
4.一种如权利要求1或2或3所述的表面质量优良的冷轧热镀锌DH590钢板的生产方法,钢板的生产工艺为:转炉冶炼、板坯连铸、热轧、酸洗冷轧、连续热镀锌,其特征在于:
热轧:铸坯入炉温度在400~500℃之间,加热温度在1150~1250℃之间,开轧温度在1000~1120℃之间,终轧温度在880℃以上,卷取温度在500~650℃之间;热轧钢板厚度在2~6mm之间;
酸洗冷轧:酸液温度控制在60~95℃,酸液浓度在50~250g/L,冷轧压下率为40%~75%;
热镀锌:预热温度控制在250~450℃之间,退火温度在750~850℃之间,退火时间在30~300s之间,缓冷出口温度为660~700℃,快速冷却速率大于20℃/s,镀锌温度为450~470℃,镀锌结束后带钢先气刀冷却到400~420℃,随后采用风冷冷却,冷却塔顶辊温度控制在250~300℃;光整过程的光整延伸率控制在0.2%~0.5%范围内。
5.根据权利要求4所述的表面质量优良的冷轧热镀锌DH590钢板的生产方法,其特征在于:热轧后钢板显微组织按体积百分比计,由40%~70%铁素体、20%~40%珠光体,5%~20%贝氏体,1%~5%渗碳体组成。
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