CN102433500A - 一种含钛if钢及退火工艺 - Google Patents
一种含钛if钢及退火工艺 Download PDFInfo
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- CN102433500A CN102433500A CN2011103933702A CN201110393370A CN102433500A CN 102433500 A CN102433500 A CN 102433500A CN 2011103933702 A CN2011103933702 A CN 2011103933702A CN 201110393370 A CN201110393370 A CN 201110393370A CN 102433500 A CN102433500 A CN 102433500A
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- steel
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- 239000010959 steel Substances 0.000 title claims abstract description 38
- 238000000137 annealing Methods 0.000 title claims abstract description 37
- 229910052719 titanium Inorganic materials 0.000 title claims abstract description 10
- 238000005516 engineering process Methods 0.000 title abstract description 7
- 239000010936 titanium Substances 0.000 title abstract 3
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- 238000001816 cooling Methods 0.000 claims abstract description 8
- 238000010438 heat treatment Methods 0.000 claims abstract description 7
- 239000012535 impurity Substances 0.000 claims abstract description 7
- 239000000126 substance Substances 0.000 claims abstract description 7
- 238000000034 method Methods 0.000 claims description 23
- 235000019628 coolness Nutrition 0.000 claims description 11
- 239000004615 ingredient Substances 0.000 claims description 6
- 238000002791 soaking Methods 0.000 claims description 4
- 238000009413 insulation Methods 0.000 claims 1
- 229910052698 phosphorus Inorganic materials 0.000 abstract description 5
- 238000005482 strain hardening Methods 0.000 abstract description 5
- 229910052799 carbon Inorganic materials 0.000 abstract description 4
- 238000005272 metallurgy Methods 0.000 abstract description 2
- 238000007599 discharging Methods 0.000 abstract 2
- 238000004321 preservation Methods 0.000 abstract 1
- 238000007669 thermal treatment Methods 0.000 abstract 1
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- 230000015572 biosynthetic process Effects 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N carbon Chemical compound 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[C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 238000005755 formation reaction Methods 0.000 description 2
- 238000001953 recrystallisation Methods 0.000 description 2
- 229910017083 AlN Inorganic materials 0.000 description 1
- 229910000655 Killed steel Inorganic materials 0.000 description 1
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 1
- 229910019802 NbC Inorganic materials 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminum Chemical compound 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[Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- PIGFYZPCRLYGLF-UHFFFAOYSA-N aluminum nitride Chemical compound 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Abstract
一种含钛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：C≤0.008％，Si 0.01～0.0143％，Mn≤0.15％，P≤0.01％，S≤0.01％，Ti 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Δr≤0.35；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
Description
一种含钛IF钢及退火工艺
技术领域
[0001] 本发明属于冶金及热处理技术领域，涉及一种含钛IF钢及退火工艺。 背景技术
[0002] 无间隙原子钢（简称IF钢），即在超低碳钢中加入强碳、氮化合物形成元素Nb、 Ti，使钢中间隙C、N原子以碳、氮化物形式存在，因而具有低屈强比、高延伸率、高应变硬化指数（η值）和高塑性应变比（r值）等优异性能，广泛应用于汽车工业。按照合金元素的不同，IF钢被分为3种：即单一添加Ti，单一添加Nb和同时添加Ti和Nb。含Ti元素IF 钢是较为广泛生产的一种IF钢，与铝镇静钢相比，Ti-IF钢具有良好的冲压成型性，不存在钢板的时效问题。IF钢热加工生产工艺主要包括热轧、冷轧、退火等工序。其中退火是保证钢带最终性能均勻性的关键工序，罩式退火和连续退火是较为传统的两种退火方式，然而对于含有一定量Ti的IF钢而言，由于含Ti的IF钢的沉淀物（MnS、A1N、NbC)比含Nb和 Ti的IF钢中的沉淀物粗大，这种粗大的析出物会有利于促使退火后{111}织构的形成，含 Ti的IF钢的再结晶温度比含Nb和Ti的IF钢的再结晶温度低，在一个给定较低的退火温度下，含Ti的IF钢比含Nb和Ti的IF钢具有更高的成型性。
发明内容
[0003] 本发明的目的是公开一种含钛IF钢及退火工艺，其化学成分及重量百分比含量应符合：C 彡 0. 008%, Si 0. 01 〜0. 0143%, Mn ^ 0. 15%, P ^ 0. 01 %, S ^ 0. 01%, Ti 0. 041-0. 06%, Nb 0.001-0. 003%，其余为！^和无法检测的微量杂质。退火处理工艺制度一：加热速率6°C /分钟，退火温度为650-700°C，保温时间为1-10小时，随炉冷却至 4000C _450°C出炉空冷。退火处理工艺制度二 ：退火温度为800-840°C，到温入炉，保温2-10 分钟出炉空冷。
[0004] 通过上述工艺处理之后的IF钢试样中晶粒形核前孕育时间充分，{111}织构组分增强，第二相析出呈弥散分布。由上述两种工艺处理后的IF钢试样均具有优异的深冲性能和良好的成型性能。通过工艺制度一处理的含钛IF钢其抗拉强度达到290-310MPa， 屈服强度100-155MPa，应变硬化指数„ ^0. 245，平面各向异性度ΔΓ彡0. 35 ；通过工艺制度二处理的含钛IF钢其抗拉强度达到290-310MPa，屈服强度115_160MPa，应变硬化指数 n^O. 26，平面各向异性度ΔΓ彡0. 40。
[0005] 本发明具有生产效率高、产品性能高、可生产高深冲性能软质钢板的优势，生产灵活，建设投资少，适合小批量、多品种生产。
附图说明
[0006] 图1为退火方案一工艺制度曲线；
[0007] 图2为退火方案二工艺制度曲线，虚线为样品未入炉，实线为样品入炉；
[0008] 图3为实施例1的试样拉伸曲线；[0009] 图4为660°C退火金相组织照片；
[0010] 图5为800°C退火金相组织照片。
具体实施方式
[0011] 以下结合实施例对本发明作进一步的描述。
[0012] 实施例1
[0013] 将拟轧制的冷硬薄板放入加热炉，薄板的化学成分及重量百分比含量为： CO. 0042%, Si 0. 012%,Mn 0. 14%, P 0. 008%, S 0. 004%, Ti 0. 045%, Nb 0.001%，其余
为Fe和无法检测的微量杂质。
[0014] 加热速率6°C /分钟，退火温度660°C，保温时间2小时，之后随炉冷却至440°C出炉空冷。依据上述工艺处理之后的IF钢试样力学性能检测值见表1，退火工艺曲线如图1、 拉伸曲线如图3、金相组织如图4所示。
[0015] 表1力学性能检测值
[0016]
[0017] 实施例2
[0018] 将拟轧制的冷硬薄板放入加热炉，薄板的化学成分及重量百分比含量为： CO. 0054%, Si 0. 013%, Mn 0. 148%, P 0. 01%, S 0. 004%, Ti 0. 05%, Nb 0.002%，其余
为Fe和无法检测的微量杂质。
[0019] 加热速率6°C /分钟，退火温度680°C，保温时间2小时，之后随炉冷却至420°C出炉空冷。依据上述工艺处理之后的IF钢试样力学性能检测值见表2。
[0020] 表2力学性能检测值
[0021]
[0022] 实施例3
[0023] 将拟轧制的冷硬薄板到温放入加热炉，薄板的化学成分及重量百分比含量为：C0. 0054%, Si 0. 013%,Mn 0. 148%, P 0. 01%, S 0. 004%, Ti 0. 05%, Nb 0.002%，其余为
Fe和无法检测的微量杂质。
[0024] 薄板试样到温入炉，退火温度800°C，保温2分钟出炉空冷。依据上述工艺处理之后的IF钢试样力学性能检测值见表3，退火工艺曲线如图2、金相组织如图5所示。
[0025] 表3力学性能检测值
[0026]
[0027] 实施例4
[0028] 将拟轧制的冷硬薄板到温放入加热炉，薄板的化学成分及重量百分比含量为：C 0. 006%, Si 0. 011%,Mn 0. 14%, P 0. 008%, S 0. 005%, Ti 0. 045%, Nb 0.002%，其余为
Fe和无法检测的微量杂质。
[0029] 薄板试样到温入炉，退火温度820°C，保温5分钟出炉空冷。依据上述工艺处理之后的IF钢试样力学性能检测值见表4。
[0030] 表4力学性能检测值
[0031]
Claims (3)
1. 一种含钛IF钢，其特征在于化学成分及重量百分比含量应符合：C ^ 0. 008%, Si 0. 01 〜0. 0143 %, Mn ^ 0. 15 %, P ^ 0. 01 %, S ^ 0. 01 %, Ti 0. 041-0. 06 %, Nb 0. 001-0. 003%，其余为！^和无法检测的微量杂质。
2.如权利要求1所述特征的含钛IF钢的退火处理工艺，其特征在于退火处理工艺制度一为：加热速率6V /分钟，退火温度660-700°C，保温时间为1-10小时，随炉冷却至 4000C _450°C出炉空冷；退火处理工艺制度二为：退火温度800-840°C，到温入炉，保温2-10 分钟出炉空冷。
3.根据权利要求2所述的含钛IF钢的退火处理工艺，其特征在于退火工艺制度一采用连续式加热，保温后随炉冷却到一定温度出炉空冷，退火工艺制度二采用到温入炉，短时保温后出炉空冷。
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