CN115074627A - 一种卷尺用弹簧钢带及其制备方法 - Google Patents
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- 229910000639 Spring steel Inorganic materials 0.000 title claims abstract description 14
- 238000002360 preparation method Methods 0.000 title abstract description 7
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 58
- 239000010959 steel Substances 0.000 claims abstract description 58
- 238000007670 refining Methods 0.000 claims abstract description 28
- 238000005096 rolling process Methods 0.000 claims abstract description 18
- 238000010438 heat treatment Methods 0.000 claims abstract description 16
- 238000001816 cooling Methods 0.000 claims abstract description 14
- 238000000034 method Methods 0.000 claims abstract description 13
- 238000005266 casting Methods 0.000 claims abstract description 12
- 238000003723 Smelting Methods 0.000 claims abstract description 11
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 10
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- 238000009749 continuous casting Methods 0.000 claims abstract description 10
- 229910052742 iron Inorganic materials 0.000 claims abstract description 9
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 9
- 239000000126 substance Substances 0.000 claims abstract description 7
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- 238000004519 manufacturing process Methods 0.000 claims description 7
- 229910000616 Ferromanganese Inorganic materials 0.000 claims description 5
- 229910000519 Ferrosilicon Inorganic materials 0.000 claims description 5
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 5
- DALUDRGQOYMVLD-UHFFFAOYSA-N iron manganese Chemical compound [Mn].[Fe] DALUDRGQOYMVLD-UHFFFAOYSA-N 0.000 claims description 5
- 229910052760 oxygen Inorganic materials 0.000 claims description 5
- 239000001301 oxygen Substances 0.000 claims description 5
- 238000001953 recrystallisation Methods 0.000 claims description 5
- 238000010079 rubber tapping Methods 0.000 claims description 5
- 238000002791 soaking Methods 0.000 claims description 5
- 239000007921 spray Substances 0.000 claims description 5
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 abstract description 4
- 239000010703 silicon Substances 0.000 abstract description 4
- 229910052755 nonmetal Inorganic materials 0.000 abstract description 3
- 238000005097 cold rolling Methods 0.000 abstract description 2
- 238000005261 decarburization Methods 0.000 abstract description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 12
- 239000002893 slag Substances 0.000 description 4
- 238000007920 subcutaneous administration Methods 0.000 description 4
- 238000005496 tempering Methods 0.000 description 4
- 238000009489 vacuum treatment Methods 0.000 description 4
- 229910045601 alloy Inorganic materials 0.000 description 3
- 239000000956 alloy Substances 0.000 description 3
- 230000003811 curling process Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000010791 quenching Methods 0.000 description 3
- 230000000171 quenching effect Effects 0.000 description 3
- 229910001567 cementite Inorganic materials 0.000 description 2
- KSOKAHYVTMZFBJ-UHFFFAOYSA-N iron;methane Chemical compound C.[Fe].[Fe].[Fe] KSOKAHYVTMZFBJ-UHFFFAOYSA-N 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- 239000013078 crystal Substances 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000009851 ferrous metallurgy Methods 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
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- 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
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Abstract
本发明公开了一种卷尺用弹簧钢带及其制备方法,卷尺用弹簧钢带化学成分以质量百分数计含有:C:0.66~0.72%、Si:1.80~2.10%、Mn:0.80~1.10%、P≤0.020%、S≤0.020%、Ti≤0.0020%、Al≤0.010%,余量为Fe和不可避免的杂质。制备方法包括电炉初炼、LF精炼、VD精炼、连铸、铸坯加热、带钢轧制和带钢卷曲。本发明通过调整化学成分中的碳和硅含量,通过采用LF+VD夹杂物塑性化工艺获得洁净钢,采用控轧控冷工艺轧制获得均匀、细小组织和脱碳少的热轧钢带,其非金属夹杂总和≤4.5,脱碳层≤0.08mm,晶粒度≥8级。带钢经后续冷轧、分条、热处理制成宽度≥25mm尺带后,硬度可达50~58HRC,疲劳寿命达5千至1万次,直线度、挺直度均满足卷尺标准要求。
Description
技术领域
本发明属于钢铁冶金领域,涉及一种卷尺用弹簧钢带及其制备方法。
背景技术
卷尺尺带一般采用50、65Mn钢等材料,制成尺带宽度一般为5~25mm,淬回火硬度为45~50HRC。使用时,将尺带从尺壳中拉出;使用结束后,尺壳内的螺旋尺簧带动尺带盘转动将尺带卷收起来,尺带反复拉收要求钢尺带具有非常高的纯净度和疲劳寿命。当前,市场对于卷尺尺带宽度、硬度及疲劳寿命提出了新的需求,采用现有材料制作尺带宽度为25mm以上时,硬度低于50HRC,疲劳寿命低于5千次,同时直线度、挺直度也达不到卷尺标准要求。因此,开发一种宽尺带、高硬度尺带用材料具有重要意义。
发明内容
发明目的:本发明的目的是针对上述的宽尺带、高硬度尺带材料需求,提出一种卷尺用弹簧钢带;本发明的第二目的是提出该卷尺用弹簧钢带的制备方法。
技术方案:本发明所述的卷尺用弹簧钢带,化学成分以质量百分数计含有:C:0.66~0.72%、Si:1.80~2.10%、Mn:0.80~1.10%、P≤0.020%、S≤0.020%、Ti≤0.0020%、Al≤0.010%,余量为Fe和不可避免的杂质。
碳是钢中主要强化元素,做成卷尺经淬回火热处理后,碳是保证其回火组织具有良好强度和硬度的关键因素。硅在钢中主要起固溶强化作用,通过抑制渗碳体在回火过程中晶核的形成和长大,从而改变渗碳体的形态和分布,提高钢的抗松弛能力,使得卷簧疲劳寿命得到大幅提高。本发明通过成分优化,在成本增加较少的情况下,将碳由0.50~0.65%提高至0.66~0.72%,硅由0.17~0.37%提高至1.80~2.10%,使得尺带淬回火后硬度达到50~58HRC,疲劳寿命达5千至1万次。
优选地,卷尺用弹簧钢带化学成分以质量百分数计含有:C:0.67~0.69%、Si:1.85~1.95%、Mn:0.85~0.95%、P≤0.010%、S≤0.010%、Ti≤0.0010%、Al≤0.005%,余量为Fe和不可避免的杂质。
本发明还保护一种卷尺用弹簧钢带的制备方法,工艺流程包括电炉初炼、LF精炼、VD精炼、连铸、铸坯加热、带钢轧制和带钢卷曲;
其中,电炉初炼,将30%~60%的铁水和40%~70%的废钢在电炉中初炼40~50min,得到碳≤0.06%、氧≤600ppm初炼钢水,出钢时加入硅铁、锰铁合金,不允许加Al脱氧,减少B类夹杂形成;
LF精炼,将电炉初炼钢水转移至LF精炼,白渣精炼时间20~80min,获得高洁净LF精炼钢水;
VD精炼,将LF精炼钢水转移至VD精炼,真空处理时间30~60min;
连铸,将成分和温度符合要求的钢水吊包至连铸,采用汽-水喷雾弱冷方式,恒拉速1.4m/min,得到无角裂与皮下裂纹的150mm×220mmm方坯;
铸坯加热,铸坯经肉眼检测无缺陷后,采用推进式加热,均热段温度1000~1200℃,加热时间1.5h~4h,减少脱碳层形成。
带钢轧制,轧制时调节最后一台平辊轧机速度和过程冷却管水流量,保证带钢精轧时未再结晶区变形量≥30%,终轧温度低于890℃;轧制钢带厚度为2~6mm,宽度为145~285mm;
带钢卷曲时,轧件进入运输链后,采用风机、雾炮等方式冷却,保证卷曲温度不低于650℃。
有益效果:本发明与现有技术相比,具有如下显著优点:本发明通过调整化学成分中的碳和硅含量,通过采用LF+VD夹杂物塑性化工艺获得洁净钢,采用控轧控冷工艺轧制获得均匀、细小组织和脱碳少的热轧钢带,其非金属夹杂总和≤4.5,脱碳层≤0.08mm,晶粒度≥8级。带钢经后续冷轧、分条、热处理制成宽度≥25mm尺带后,硬度可达50~58HRC,疲劳寿命达5千至1万次,直线度、挺直度均满足卷尺标准要求。目前市面上无同性能产品,本发明的产品竞争力强,可拓宽带钢市场。
具体实施方式
表1各实施例中卷尺用弹簧钢带冶炼终点成分表(单位:质量百分数wt%)
元素 | C | Si | Mn | P | S | Ti | Al |
实施例一 | 0.67 | 1.85 | 0.85 | 0.005 | 0.002 | 0.0001 | 0.0020 |
实施例二 | 0.68 | 1.90 | 0.90 | 0.007 | 0.003 | 0.0002 | 0.0030 |
实施例三 | 0.69 | 1.95 | 0.95 | 0.010 | 0.003 | 0.0009 | 0.0050 |
实施例1
(1)电炉初炼,将30%的铁水和70%的废钢在电炉中初炼40min,得到碳0.04%、氧600ppm初炼钢水,出钢时加入硅铁、锰铁合金,不允许加Al脱氧,减少B类夹杂形成;
(2)LF精炼,将电炉初炼钢水转移至LF精炼,白渣精炼时间20min,获得高洁净LF精炼钢液。
(3)VD精炼,将LF精炼钢水转移至VD精炼,真空处理时间30min。
(4)连铸,将成分和温度符合要求的钢水吊包至连铸,采用汽-水喷雾弱冷方式,恒拉速1.4m/min,得到无角裂与皮下裂纹的150mm×220mmm方坯。
(5)铸坯加热,铸坯经肉眼检测无缺陷后,采用推进式加热,均热段温度1000℃,加热时间4h,减少脱碳层形成。
(6)轧制工艺:调节最后一台平辊轧机速度和过程冷却管水流量,保证带钢精轧时未再结晶区变形量40%,终轧温度885℃。
(7)卷曲工艺:轧件进入运输链后,采用风机、雾炮方式冷却,卷曲温度650℃。
实施例2
(1)电炉初炼,将40%的铁水和60%的废钢在电炉中初炼45min,得到碳0.05%、氧500ppm初炼钢水,出钢时加入硅铁、锰铁合金,不允许加Al脱氧,减少B类夹杂形成;
(2)LF精炼,将电炉初炼钢水转移至LF精炼,白渣精炼时间48min,获得高洁净LF精炼钢液。
(3)VD精炼,将LF精炼钢水转移至VD精炼,真空处理时间42min。
(4)连铸,将成分和温度符合要求的钢水吊包至连铸,采用汽-水喷雾弱冷方式,恒拉速1.4m/min,得到无角裂与皮下裂纹的150mm×220mmm方坯。
(5)铸坯加热,铸坯经肉眼检测无缺陷后,采用推进式加热,均热段温度1100℃,加热时间2.5h,减少脱碳层形成。
(6)轧制工艺:调节最后一台平辊轧机速度和过程冷却管水流量,保证带钢精轧时未再结晶区变形量40%,终轧温度878℃。
(7)卷曲工艺:轧件进入运输链后,采用风机、雾炮方式冷却,卷曲温度653℃。
实施例3
(1)电炉初炼,将60%的铁水和40%的废钢在电炉中初炼50min,得到碳0.06%、氧450ppm初炼钢水,出钢时加入硅铁、锰铁合金,不允许加Al脱氧减少B类夹杂形成;
(2)LF精炼,将电炉初炼钢水转移至LF精炼,白渣精炼时间80min,获得高洁净LF精炼钢液。
(3)VD精炼,将LF精炼钢水转移至VD精炼,真空处理时间58min。
(4)连铸,将成分和温度符合要求的钢水吊包至连铸,采用汽-水喷雾弱冷方式,恒拉速1.4m/min,得到无角裂与皮下裂纹的150mm×220mmm方坯。
(5)铸坯加热,铸坯经肉眼检测无缺陷后,采用推进式加热,均热段温度1200℃,加热时间1.5h,减少脱碳层形成。
(6)轧制工艺:调节最后一台平辊轧机速度和过程冷却管水流量,保证带钢精轧时未再结晶区变形量40%,终轧温度870℃。
(7)卷曲工艺:轧件进入运输链后,采用风机、雾炮方式冷却,卷曲温度665℃。
通过实施例1至3的方法可制得非金属夹杂总和≤4.5,脱碳层≤0.08mm,晶粒度≥8级的弹簧热轧带钢。轧制厚度2.1mm、2.5mm、3.0mm弹簧热轧带钢,制作26mm~35mm宽度尺带时,硬度可达到53~58HRC,疲劳寿命达7~9千次,同时直线度、挺直度均符合卷尺标准要求。
Claims (8)
1.一种卷尺用弹簧钢带,其特征在于:化学成分以质量百分数计含有:C:0.66~0.72%、Si:1.80~2.10%、Mn:0.80~1.10%、P≤0.020%、S≤0.020%、Ti≤0.0020%、Al≤0.010%,余量为Fe和不可避免的杂质。
2.根据权利要求1所述的卷尺用弹簧钢带,其特征在于:化学成分以质量百分数计含有:C:0.67~0.69%、Si:1.85~1.95%、Mn:0.85~0.95%、P≤0.010%、S≤0.010%、Ti≤0.0010%、Al≤0.005%,余量为Fe和不可避免的杂质。
3.一种权利要求1或2所述的卷尺用弹簧钢带的制备方法,其特征在于:工艺流程包括电炉初炼、LF精炼、VD精炼、连铸、铸坯加热、带钢轧制和带钢卷曲;
通过电炉初炼得到碳≤0.06%、氧≤600ppm的初炼钢水,出钢时加入硅铁、锰铁合金,不加Al脱氧,减少B类夹杂形成;
带钢轧制时,调节最后一台平辊轧机速度和过程冷却管水流量,保证带钢精轧时未再结晶区变形量≥30%,终轧温度低于890℃。
4.根据权利要求3所述的制备方法,其特征在于:连铸时,采用汽-水喷雾弱冷方式,恒拉速1.4m/min。
5.根据权利要求3所述的制备方法,其特征在于:连铸坯为规格150mm×220mm的方坯。
6.根据权利要求3所述的制备方法,其特征在于:铸坯加热时,采用推进式加热,均热段温度1000~1200℃,加热时间1.5h~4h。
7.根据权利要求3所述的制备方法,其特征在于:轧制钢带厚度为2~6mm,宽度为145~285mm。
8.根据权利要求3所述的制备方法,其特征在于:带钢卷曲时,轧件进入运输链后,采用风机、雾炮方式冷却,保证卷曲温度不低于650℃。
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