CN100369712C - 一种低铁损冷轧无取向硅钢板的制造方法 - Google Patents
一种低铁损冷轧无取向硅钢板的制造方法 Download PDFInfo
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- CN100369712C CN100369712C CNB2005100468101A CN200510046810A CN100369712C CN 100369712 C CN100369712 C CN 100369712C CN B2005100468101 A CNB2005100468101 A CN B2005100468101A CN 200510046810 A CN200510046810 A CN 200510046810A CN 100369712 C CN100369712 C CN 100369712C
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- 238000005098 hot rolling Methods 0.000 claims abstract description 10
- 238000009749 continuous casting Methods 0.000 claims description 10
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- NINIDFKCEFEMDL-UHFFFAOYSA-N sulfur Chemical compound 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[S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
Abstract
本发明提出了一种低铁损冷轧无取向硅钢板的制造方法，包括连铸板坯热轧、酸洗、冷轧、退火、涂绝缘层和卷带各工序，其特征在于冷轧时采用一次冷轧法，并且在其末道次冷轧中引入异步轧制方式，轧机上、下轧辊的周向转速比为1∶1.05～1∶1.30。冷轧分成五个道次，总压下率为72～85%，道次压下率为20～35%。本发明利用异步轧制特有的搓轧变形来强化材料组织和织构的调控效果，从而达到降低铁损的目的。利用本发明的方法生产无取向硅钢板可产生很好的经济效益，取得显著的技术进步。
Description
一种低铁报冷轧无取向珪钢板的制造方法技术領滅本发明属于钢铁冶金与加工的技术领域，即涉及一种低铁损冷轧无取向硅钢板的制造方法*背暴技术冷轧无取向硅钢板主要用于制造电动机和发电机的铁芯，铁损是其嚴关键的性能指标。 冷轧无取向硅钢板的制造流程包括冶炼、连铸、热轧、冷轧及成品退火和涂绝缘层等主要工 艺过程。降低无取向硅钢板的铁损目前主要依靠三个途径： 一是纯净钢质，即尽量降低钢中 碳、硫、氮和氧的含量，这对冶炼设备和技术等都铕要提出极髙的要求；二是提离钢中Si+Al 的含量，增大电阻率，但这会导致磁感降低，并使钢材的冷加工性能恶化；三是改进和调整 轧制与退火等工艺，优化成品钢板的再结晶织构和晶粒尺寸。异步轧制是由于上下工作辊周向速度不等而形成的特殊轧制方式，它具有轧制力和扭矩 低以及轧制薄板糖度髙等优点，同时其特有的搓轧形式可产生通体剪切变形，改变轧制态组 织和织构特征。特公昭56-152923和152925号公报公开了在2.4~4.5wt%Si>Kl.0wt%Al和 1.5一.5wtynSi4^1.0wtyoAl无取向硅钢的热连轧精轧机组最后一个或两个机架采用异步轧制的 技术，通过破坏板厚方向中心区的柱状晶，使冷轧和退火后各处的晶粒均匀生长，且可省去 常化工艺。特公昭55-148725公开了在取向硅钢连铸坯（2.(M.0wt%Si，《0.085wt%C)的热 轧工艺（精轧或粗轧）中引入异步轧制技术，用以产生贯穿板厚的强剪切变形，破碎热轧前 髙温加热过程中形成的粗大晶粒，使二次再结晶更完全，从而获得更优异的磁性能。 发明内容本发明旨在寻求一种低铁损冷轧无取向硅钢板的制造方法。本发明提出了一种冷轧无取向硅钢板的制造方法，它包括冶炼、连铸、热轧、酸洗、冷 轧、退火、涂绝缘层和巻带等工序，其特征在于冷轧过程的末道次中引入异步轧制方式，通 过异步轧制特有的搓轧变形来强化组织和织构的调控效果，实现在相同杂质水平和Si+Al含 i的基础上，大幅度阵低铁损，生产高品质的无取向硅钢板。本发明的冷轧无取向硅钢板的制造方法，其热轧工艺的加热温度为1130~11801C,终轧 温度为83(K8701C,巻取温度为58(^620*0。热轧后采用一次冷轧法，总压下率为72~85%，
通常分为五道次，道次压下率为2(K35%。本发明在最后一道冷轧工序中采用异步轧制方式， 其上、下工作辊的周向速度比为1:1.05〜1:1.30,且冷轧方向始终与热轧方向一致。冷轧板经 常规的成品退火和涂维缘层后制成无取向硅钢板。本发明的制造方法适用于化学成分（以重量百分数计算）为：Si+Al《4.2; C《0.005; Mn0.2~0.35; S《0.003; N2《0.003; O2《0.002; Fe余量。使用本发明的方法所制造的无取向 硅钢板与常规工艺所生产的同成分、同规格的硅钢板相比较，磁感（B5o)相近而铁损（P15) 则有明显的降低。本发明的方法，不是通过提纯钢质或提髙Si+Al含量的途径，而只是改变轧制方式和工 艺參数来达到降低铁损的目的。故从工艺上来说比较容易在现有的生产线上实施，产生可观 的杜会效益和经济效益。 具体实旌方式下面结合实施例对本发明的方法作进一步说明。实施例l化学成分（以重i百分数计算）为：C 0.002; Si +A1=2.1(H0.90; Mn 0.35; P 0.018; S 0.0025; N2 0.0012; O2 0.0010: Fe余量的连铸坯，经1150"均热后，热轧至2.4mm厚，终轧温度830 r，巻取温度5801C。酸洗去氣化皮后，采用一次冷轧法分五道次冷轧至成品厚度0.35mm，总压下率85%, 五道次的压下率分别为：35%、 31%、 33%、 32%和27%,即经由2.4mm—1.56mm—1.07mm —0.71mm—0.48 mm—0.35mm,前四道冷轧工序采用同步轧制方式，末道冷轧工序引入异步 轧制方式，上下轧辊的周向速度比为l: 1.05。冷轧后，对硅钢板进行900X:、 5分钟的成品退火，再涂绝缘层后即巻带入成品库。实施例2化学成分（以重:l:百分数计算）为：C0.005; Si+Al=3.10+1.0: Mn0.2; P0.02; S 0.003; N2 0.003; O2 0.002; Fe余量的连铸坯，经过11801C均热后，热轧至2.4mm厚，终轧温度870 'C,巻取温度620"。 .酸洗去氧化皮后，釆用一次冷轧法分五道次冷轧至成品厚度0.65mm,总压下率72%。 五道次的压下率分别为27%、24°/。、22°/。、21%和20%,即2.4mm—1.75mm—1.32mm—1.03mm ,0.81mm—0.65mm。前四道冷乳工序采用同步轧制方式，末道冷轧工序引入异步轧制方式， 上下轧辊的周向速度比取l: 1.30。
冷轧后，对硅钢板进行iooot:、 i分钟的成品退火，再涂敷绝缘层并巻带入成品库。实施例3化学成分（以重量百分数计算）为：C0.0024; Si+Al= 2.42+0.333; Mn0.28; P0.014; S 0.0025: N2 0.0012; O2 0.0016; Fe余量的连铸坯，经1138"C均热后，热轧至2.4mm厚，终 轧温度852'C,巻取温度607"C。酸洗去氧化皮后，采用一次冷轧法分五道次冷轧至成品厚度0.5mm,总压下率80%,道 次压下率为25~30%，即2.4mm—1.70mm—1.24mm—0.88mm—0.65mm—0.5mm。前四道次 冷轧工序为常規的同步轧制方式，末道冷轧工序则引入异步轧制方式，上下轧辊的周向速度 比采用l: 1.063,冷轧后，对硅钢板进行950"C、 l分钟的成品退火，再经涂绝缘层后巻带入库。 实施例4化学成分（以重Jt百分数计算）为：C0.0024; Si+Al=2.42+0.333; MnO.28; P0.014; S 0.0025; N2 0.0012; 02 0.0016; Fe余i的连铸坯，经1138卩均热后，热轧至2.4mm厚，终 轧温度852"C,巻取温度607"。酸洗去氣化皮后，釆用一次冷轧法分五道次冷轧至成品厚度0.5mm，总压下率80%,道 次压下率为25~30%,艮卩2.4mm—1.70mm—1.24mm—0.88mm—0.65mm—0.5mm。前四道次 冷轧工序为常规的同步轧制方式，末道冷轧工序则引入异步轧制方式，上下轧辊的周向速度 比采用l: U25。冷轧后，对硅钢板进行9501C、 l分钟的成品退火，再经涂绝缘层后巻带入库。 实施例5化学成分（以重量百分数计算）为：C0.003; Si+Al=2.0+1.0; Mn0.25; P0.010; S0.0025: N2 0.0010; 02 0.0015; Fe余量的连铸板坯，经1130"C均热后，热轧至2.4mm厚，终轧温度 850"，巻取温度600"C。酸洗去氧化皮后，采用一次冷轧法分五道次冷轧至成品厚度0.65mm,总压下率72%。 五个道次的压下率分别为：27%、 24%、 22%、 21%和20°/。，即2.4mm—1.75mm—1.32mm— 1.03mm—0.81mm—0.65mrn。前四道次冷轧采用同步轧制方式，末道冷轧工序引入异步轧制 方式，上下轧辊的周向速度比为l: 1.063。冷轧后，对硅钢板进行9501C、 l分钟的成品退火，再经涂绝缘层后巻带入库。实施例6
化学成分（以重Jl百分数计算）为：C 0.002; Si +A1=2.10+0.35; Mn 0.30; P 0.015; S 0.0020: N2 0.0020; Oz 0.0015; Fe余i的连铸坯，经1160匸均热后，热轧至2.4mm厚，终轧温度860 •C,巻取温度610"C。经酸洗去氣化皮后，采用一次冷轧M五道次冷轧至成品厚度0.35mrn，总压下率85%, 五道次的压下率分别为：35%、 31%、 33%、 32%和27%，即经由2.4mm—1.56mm—1.07mm —0.71mm—0.48mm—0.35mm。前四道次冷轧采用同步轧制方式，末道次冷轧工序引入异步 轧制方式，上、下轧辊的周向速度比为l: 1,125。冷轧后，对硅钢板进行10501C、 30秒钟的成品退火，再经表面涂绝缘层后巻带入成品库。 以实施例3和4及常规工艺制造的无取向硅钢板的铁损（P15)和磁感（Bw),其纵横向 測试的平均值列入表l中。表l<table>table see original document page 6</column></row>
<table>由表1可见，在冷轧工序中引入末道异步轧制可使无取向硅钢板的铁损明显降低，这很 好地体现了本发明的价值。
Claims (2)
1、一种低铁损冷轧无取向硅钢板的制造方法，包括连铸坯热轧、酸洗、冷轧、退火、涂绝缘层、卷带各工序，冷轧采用一次冷轧法，其特征在于冷轧的末道工序采用异步轧制。
2、 按权利要求1所述的低铁损冷轧无取向硅钢板的制造方法，其特征在于所说的异步轧 制方式中上下轧辊的周向转速比为1:1.05〜1:1.30。
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