CN114959427A - 一种汽车用180MPa级超低碳烘烤硬化钢的制造方法 - Google Patents
一种汽车用180MPa级超低碳烘烤硬化钢的制造方法 Download PDFInfo
- Publication number
- CN114959427A CN114959427A CN202210546131.4A CN202210546131A CN114959427A CN 114959427 A CN114959427 A CN 114959427A CN 202210546131 A CN202210546131 A CN 202210546131A CN 114959427 A CN114959427 A CN 114959427A
- Authority
- CN
- China
- Prior art keywords
- mpa
- steel
- temperature
- rolling
- equal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 27
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 17
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 15
- 229910000760 Hardened steel Inorganic materials 0.000 title claims description 11
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 29
- 239000010959 steel Substances 0.000 claims abstract description 29
- 238000000034 method Methods 0.000 claims abstract description 27
- 230000008569 process Effects 0.000 claims abstract description 17
- 238000000137 annealing Methods 0.000 claims abstract description 15
- 238000005097 cold rolling Methods 0.000 claims abstract description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 36
- 238000005096 rolling process Methods 0.000 claims description 22
- 229910052742 iron Inorganic materials 0.000 claims description 17
- 238000010438 heat treatment Methods 0.000 claims description 14
- 238000005261 decarburization Methods 0.000 claims description 13
- 238000006477 desulfuration reaction Methods 0.000 claims description 11
- 230000023556 desulfurization Effects 0.000 claims description 11
- 238000007689 inspection Methods 0.000 claims description 11
- 238000010079 rubber tapping Methods 0.000 claims description 9
- 238000005070 sampling Methods 0.000 claims description 8
- 238000003723 Smelting Methods 0.000 claims description 7
- 238000001816 cooling Methods 0.000 claims description 7
- 238000005098 hot rolling Methods 0.000 claims description 7
- 229910001200 Ferrotitanium Inorganic materials 0.000 claims description 6
- 239000002253 acid Substances 0.000 claims description 6
- 239000002893 slag Substances 0.000 claims description 6
- 238000009628 steelmaking Methods 0.000 claims description 6
- 229910052717 sulfur Inorganic materials 0.000 claims description 6
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 5
- 239000011593 sulfur Substances 0.000 claims description 5
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 4
- 238000009529 body temperature measurement Methods 0.000 claims description 4
- 238000009749 continuous casting Methods 0.000 claims description 4
- 229910052760 oxygen Inorganic materials 0.000 claims description 4
- 239000001301 oxygen Substances 0.000 claims description 4
- 238000007670 refining Methods 0.000 claims description 4
- 239000000126 substance Substances 0.000 claims description 4
- 238000009966 trimming Methods 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- 238000005303 weighing Methods 0.000 claims description 4
- 238000003466 welding Methods 0.000 claims description 4
- 229910052782 aluminium Inorganic materials 0.000 claims description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 3
- 238000007872 degassing Methods 0.000 claims description 3
- 239000012535 impurity Substances 0.000 claims description 3
- 238000002791 soaking Methods 0.000 claims description 3
- 230000007306 turnover Effects 0.000 claims description 3
- 229910000859 α-Fe Inorganic materials 0.000 claims description 3
- 238000004140 cleaning Methods 0.000 claims description 2
- 238000001035 drying Methods 0.000 claims description 2
- 238000004806 packaging method and process Methods 0.000 claims description 2
- 239000002245 particle Substances 0.000 claims description 2
- 238000002360 preparation method Methods 0.000 claims description 2
- 238000010583 slow cooling Methods 0.000 claims description 2
- 238000005406 washing Methods 0.000 claims description 2
- 229910052698 phosphorus Inorganic materials 0.000 abstract description 7
- 229910052757 nitrogen Inorganic materials 0.000 abstract description 5
- 229910001209 Low-carbon steel Inorganic materials 0.000 abstract description 4
- 229910052748 manganese Inorganic materials 0.000 abstract description 4
- 238000009864 tensile test Methods 0.000 abstract description 2
- 238000005266 casting Methods 0.000 description 7
- 239000011572 manganese Substances 0.000 description 4
- 125000004429 atom Chemical group 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 239000013049 sediment Substances 0.000 description 3
- 239000006104 solid solution Substances 0.000 description 3
- 238000003756 stirring Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 2
- 229910001069 Ti alloy Inorganic materials 0.000 description 2
- 239000012298 atmosphere Substances 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000007667 floating Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 239000011574 phosphorus Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- 229910000616 Ferromanganese Inorganic materials 0.000 description 1
- 229910000592 Ferroniobium Inorganic materials 0.000 description 1
- 229910000519 Ferrosilicon Inorganic materials 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- CKUAXEQHGKSLHN-UHFFFAOYSA-N [C].[N] Chemical class [C].[N] CKUAXEQHGKSLHN-UHFFFAOYSA-N 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 229910001566 austenite Inorganic materials 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000000265 homogenisation Methods 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- DALUDRGQOYMVLD-UHFFFAOYSA-N iron manganese Chemical compound [Mn].[Fe] DALUDRGQOYMVLD-UHFFFAOYSA-N 0.000 description 1
- ZFGFKQDDQUAJQP-UHFFFAOYSA-N iron niobium Chemical compound [Fe].[Fe].[Nb] ZFGFKQDDQUAJQP-UHFFFAOYSA-N 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 238000010907 mechanical stirring Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000003607 modifier Substances 0.000 description 1
- 125000004433 nitrogen atom Chemical group N* 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 238000010422 painting Methods 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000001953 recrystallisation Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 238000009489 vacuum treatment Methods 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
- C22C33/06—Making ferrous alloys by melting using master alloys
-
- 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
-
- 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
-
- 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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/005—Heat treatment of ferrous alloys containing Mn
-
- 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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/008—Heat treatment of ferrous alloys containing Si
-
- 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
- C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
-
- 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
-
- 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
-
- 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
- C21D8/0242—Flattening; Dressing; Flexing
-
- 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
- C21D8/0273—Final recrystallisation annealing
-
- 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
-
- 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
- C22C38/004—Very low carbon steels, i.e. having a carbon content of less than 0,01%
-
- 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
-
- 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
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- 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
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
-
- 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
-
- 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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/005—Ferrite
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Sheet Steel (AREA)
Abstract
本发明公开了本发明的目的是提供一种汽车用180MPa级超低碳烘烤硬化钢的制造方法，在超低碳钢中添加一定量的T i元素，T i与C、N含量相互协调，使钢中保留1～20ppm的自由碳含量，使产品具有35～70MPa的烘烤硬化性；同时添加P、Mn元素，协同冷轧退火核心工艺，提高产品抗拉强度，保证较低屈强比，实现成品屈服强度180～230MPa，抗拉强度300～340Mpa，断后伸长率37.0～47.0％(横向，拉伸检验：L0＝80mm，b＝20mm)，n值0.20～0.23，r值1.9～2.50，保证较低的屈强比0.59～0.67，具有良好的冲压性能。
Description
技术领域
本发明涉及材料成型领域，尤其涉及一种汽车用180MPa级超低碳烘烤硬化钢的制造方法，此发明材料广泛用于冲压汽车顶盖、门板、侧围等汽车外覆盖件。
背景技术
超低碳烘烤硬化钢板由于具有较好的深冲性能、抗凹陷性能以及在后期烤漆后较高的屈服强度，顺应了汽车轻量化发展以及节约能源的需求，成为近年来汽车行业钢板用钢的研究热点。烘烤硬化钢其在物理冶金、强化机理、使用特性等方面与传统高强钢存在很大差异。其通过微合金元素与C、N含量相互协调来控制固溶原子的数量，在交货状态下具有较低的屈服强度，有利于成形，成形后涂漆烘烤时，材料的屈服强度进一步提高，使零件具有良好的抗凹陷性和抗内压性，生产难度较大。
发明内容
本发明的目的是提供一种汽车用180MPa级超低碳烘烤硬化钢的制造方法，在超低碳钢中添加一定量的Ti元素，Ti与C、N含量相互协调，使钢中保留1～20ppm的自由碳含量，使产品具有35～70MPa的烘烤硬化性；同时添加P、Mn元素，提高产品抗拉强度，保证较低屈强比，实现成品屈服强度180～230MPa，抗拉强度300～340Mpa，断后伸长率37.0～47.0％(横向，拉伸检验：L0＝80mm，b＝20mm)，n值0.20～0.23，r值1.9～2.50，保证较低的屈强比0.59～0.67，具有良好的冲压性能。
为解决上述技术问题，本发明采用如下技术方案：
本发明一种汽车用180MPa级超低碳烘烤硬化钢的制造方法，所述180MPa级冷轧超低碳烘烤硬化钢的质量百分比的化学成分为：C 0.0010～0.0040％、Si≤0.30％、Mn 0.20～0.50％、P 0.020～0.060％、Ti 0.010％～0.040％、Al 0.015％～0.060％、S≤0.010％、O≤0.0050％、N≤0.0050％，余量为Fe和不可避免的杂质；其具体制备工艺包括：
炼钢工艺：铁水→转炉炼钢→RH精炼→板坯连铸；铁水经脱硫预处理后进行转炉冶炼，要求入转炉铁水硫含量要求小于0.002％，铁水渣扒清面积大于95％；转炉冶炼要求出钢温度≥1670℃，必须使用周转包出钢，出钢温降要求小于70℃；RH工序要求根据转炉供RH钢水就位成分及温度进行深脱碳处理，脱碳结束后，根据定氧情况加入铝粒脱氧，循环4分钟以上后加入钛铁合金调整成分；调成分完毕后确保真空循环一定时间再测温、取样，钛铁加入后，纯脱气时间保证6min以上，钢水过热度30～60℃；
热轧工艺：板坯加热→高压水除鳞→定宽压力机→E1R1粗轧机轧制→E2R2粗轧机轧制→飞剪→高压水除鳞→F1～F7精轧机轧制→加密型层流冷却→卷取→托盘运输系统→取样、检验；其板坯加热温度为1180～1260℃；加热时间150～300min；粗轧模式采用3+3；精轧终轧温度≥890℃，卷取温度为600～700℃；
冷轧工艺：酸轧开卷→焊接→拉矫→酸洗→漂洗→烘干→切边→连轧机冷轧→分切→卷取→离线检查→称重→标识→打捆→包装→入库→连退开卷→焊接→清洗→入口活套→退火炉→出口活套→平整→检查活套→切边→表面检查→涂油→卷取→称重→取样、检验；退火工艺参数：加热和均热段出口温度760～860℃，缓冷段出口温度620～700℃，快冷段出口温度≤400℃，过时效段温度≤350℃，终冷段出口温度≤150℃，平整机延伸率1.0～1.6％。
进一步的，调成分完毕后确保真空循环3min后再测温、取样。
进一步的，所制备180MPa级冷轧超低碳烘烤硬化钢的金相组织为等轴铁素体，晶粒度7.5～9.5级。
进一步的，所制备180MPa级冷轧超低碳烘烤硬化钢的成品屈服强度180～230MPa，抗拉强度300～340Mpa，断后伸长率37.0～47.0％。
与现有技术相比，本发明的有益技术效果：
本发明的汽车用180MPa级超低碳烘烤硬化钢的制造方法，采用Ti合金元素含量与C、N相互协调，消除部分间隙原子的基础上，钢中保留一定量自由碳；添加P和Mn元素设计思路，通过控制热轧、酸轧和退火工艺，实现成品性能的烘烤硬化性、低屈强比、高抗拉强度及断后伸长率。
附图说明
下面结合附图说明对本发明作进一步说明。
图1为成品金相组织。
具体实施方式
一种汽车用180MPa级超低碳烘烤硬化钢的制造方法，包括：
1.冶炼工艺
1.1脱硫预处理：采用KR铁水脱硫技术，要求深脱硫后终点硫含量在0.002％以内，KR脱硫通过机械搅拌法脱硫，搅拌头插入铁水中旋转，使铁水产生漩涡，然后向铁水漩涡中投入脱硫剂，使脱硫剂和铁水中的硫在不断的搅拌中发生脱硫反应，脱硫完成后将脱硫渣彻底扒除干净，要求铁水渣扒清面积要求大于95％，防止高硫渣兑入转炉中导致回硫。
1.2转炉冶炼：铁水经脱硫预处理后进行转炉冶炼，转炉脱磷工艺主要依靠高碱度、高氧化性、大渣量的炉渣进行脱磷。但是要想深脱磷，创造条件使铁水中的磷能够被大量氧化进入炉渣，才能达到深脱磷目标。转炉入炉铁水磷含量≤0.035％，吹氧脱碳升温，控制P、S成分，防止钢液过氧化，转炉终点温度控制在1670℃以上，必须使用周转包出钢，出钢温降要求小于70℃。转炉出钢过程加入锰铁进行合金化，加入白灰和改质剂进行顶渣改质。
1.3精炼：RH精炼炉根据钢水就位成分及温度进行脱碳处理，RH脱碳是超低碳钢生产中最重要的脱碳环节，由于真空处理时高温和搅拌强烈，所有利于提高脱碳速率的各项因素都可以加快脱碳反应。在真空室内压力迅速降低的过程中，随着提升气体流量增加，循环流量、容积系数增加，提高了脱碳速率，加快了脱碳反应的进行，脱碳结束后，根据定氧情况加入脱氧剂和成分铝，循环4分钟以上后加入钛铁、铌铁、金属锰、微碳硅铁、磷铁等合金调整成分。调成分完毕后确保真空循环3min方可测温、取样，钛铁加入后，纯脱气时间保证6min以上，保证钢水温度成分均匀化，同时有利于钢水夹杂物的上浮，提高钢水的洁净度。
1.4连铸：连铸保护浇注，防止钢液的二次氧化，避免钢水二次氧化钢质。采用恒拉速，拉速控制在1.0～2.0m/min，控制浇注合适的过热度，浇注过程中过热度控制在30～60℃左右，促进夹杂物的上浮，实现了多炉浇注。
2热轧工艺
采用步进式加热炉加热铸坯(加热工艺见表1)，粗轧采用双机架R1和R2往返式轧制，粗轧模式为3+3，精轧采用F1～F7连轧工艺，精轧温度900～960℃，保证奥氏体单相区轧制，卷取温度600～700℃，保证碳氮化物正常析出，提高深冲性能，具体热轧工艺见表2。
表1铸坯加热制度
表2轧制工艺
3退火工艺
退火使用立式连续退火炉，炉内采用还原性气氛和氮氢混合保护气氛冷却。加热段和均热段温度范围760～860℃，保证晶粒完全再结晶，加热炉各段出口温度控制情况见表3，平整机延伸率不同厚度控制情况见表4。
表3退火工艺
表4平整机延伸率
4实施例分析
4.1炼钢成分
根据以上的炼钢工艺要求，实际板坯化学成分(质量百分比)如下表5所示。
表5实例化学成分wt.％
4.2热轧性能
按照以上设计化学成分和热轧工艺，热轧板室温拉伸性能见表6，试验方法参照GB/T 228.1和GB/T 229。
表6热轧拉伸性能
4.3成品性能
在上述热轧性能的基础上进行冷轧和退火，成品的室温拉伸力学性能见表7，金相组织为等轴铁素体，晶粒度7.5～9.5级，组织形貌见图1。
表7成品拉伸性能
综上所述，本产品通过性能检验和用户使用各项性能满足需求。
本发明在超低碳钢中加入少量的Ti合金元素，与钢中的部分碳、氮原子结合生成碳氮化合物，保留一定量的固溶间隙原子C，连续退火工序采用高温退火及快速冷却，使其具有烘烤硬化性；同时添加一定量的Mn和P元素，通过置换型固溶强化来提高钢的强度。生产工艺经过冶炼、2250mm轧机、酸连轧和连续退火工艺，重点设计成分和冷轧退火核心工艺。
以上所述的实施例仅是对本发明的优选方式进行描述，并非对本发明的范围进行限定，在不脱离本发明设计精神的前提下，本领域普通技术人员对本发明的技术方案做出的各种变形和改进，均应落入本发明权利要求书确定的保护范围内。
Claims (4)
1.一种汽车用180MPa级超低碳烘烤硬化钢的制造方法，其特征在于：所述180MPa级冷轧超低碳烘烤硬化钢的质量百分比的化学成分为：C 0.0010～0.0040％、Si≤0.30％、Mn0.20～0.50％、P 0.020～0.060％、Ti 0.010％～0.040％、Al 0.015％～0.060％、S≤0.010％、O≤0.0050％、N≤0.0050％，余量为Fe和不可避免的杂质；其具体制备工艺包括：
炼钢工艺：铁水→转炉炼钢→RH精炼→板坯连铸；铁水经脱硫预处理后进行转炉冶炼，要求入转炉铁水硫含量要求小于0.002％，铁水渣扒清面积大于95％；转炉冶炼要求出钢温度≥1670℃，必须使用周转包出钢，出钢温降要求小于70℃；RH工序要求根据转炉供RH钢水就位成分及温度进行深脱碳处理，脱碳结束后，根据定氧情况加入铝粒脱氧，循环4分钟以上后加入钛铁合金调整成分；调成分完毕后确保真空循环一定时间再测温、取样，钛铁加入后，纯脱气时间保证6min以上，钢水过热度30～60℃；
热轧工艺：板坯加热→高压水除鳞→定宽压力机→E1R1粗轧机轧制→E2R2粗轧机轧制→飞剪→高压水除鳞→F1～F7精轧机轧制→加密型层流冷却→卷取→托盘运输系统→取样、检验；其板坯加热温度为1180～1260℃；加热时间150～300min；粗轧模式采用3+3；精轧终轧温度≥890℃，卷取温度为600～700℃；
冷轧工艺：酸轧开卷→焊接→拉矫→酸洗→漂洗→烘干→切边→连轧机冷轧→分切→卷取→离线检查→称重→标识→打捆→包装→入库→连退开卷→焊接→清洗→入口活套→退火炉→出口活套→平整→检查活套→切边→表面检查→涂油→卷取→称重→取样、检验；退火工艺参数：加热和均热段出口温度760～860℃，缓冷段出口温度620～700℃，快冷段出口温度≤400℃，过时效段温度≤350℃，终冷段出口温度≤150℃，平整机延伸率1.0～1.6％。
2.根据权利要求1所述的汽车用180MPa级超低碳烘烤硬化钢的制造方法，其特征在于：调成分完毕后确保真空循环3min后再测温、取样。
3.根据权利要求3所述的汽车用180MPa级超低碳烘烤硬化钢的制造方法，其特征在于：所制备180MPa级冷轧超低碳烘烤硬化钢的金相组织为等轴铁素体，晶粒度7.5～9.5级。
4.根据权利要求1所述的汽车用180MPa级超低碳烘烤硬化钢的制造方法，其特征在于：所制备180MPa级冷轧超低碳烘烤硬化钢的成品屈服强度180～230MPa，抗拉强度300～340Mpa，断后伸长率37.0～47.0％。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210546131.4A CN114959427A (zh) | 2022-05-18 | 2022-05-18 | 一种汽车用180MPa级超低碳烘烤硬化钢的制造方法 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210546131.4A CN114959427A (zh) | 2022-05-18 | 2022-05-18 | 一种汽车用180MPa级超低碳烘烤硬化钢的制造方法 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114959427A true CN114959427A (zh) | 2022-08-30 |
Family
ID=82984910
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210546131.4A Pending CN114959427A (zh) | 2022-05-18 | 2022-05-18 | 一种汽车用180MPa级超低碳烘烤硬化钢的制造方法 |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114959427A (zh) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0432519A (ja) * | 1990-05-28 | 1992-02-04 | Nippon Steel Corp | 焼付硬化性の優れた深絞り用冷延鋼板の製造方法 |
| US20080251168A1 (en) * | 2005-09-23 | 2008-10-16 | Posco | Bake-Hardenable Cold Rolled Steel Sheet With Superior Strength and Aging Resistance, Gal-Vannealed Steel Sheet Using the Cold Rolled Steel Sheet and Method For Manufacturing the Cold Rolled Steel Sheet |
| US20080251167A1 (en) * | 2005-09-23 | 2008-10-16 | Posco | Bake-Hardenable Cold Rolled Steel Sheet With Superior Strength, Galvannealed Steel Sheet Using the Cold Rolled Steel Sheet and Method for Manufacturing the Cold Rolled Steel Sheet |
| CN111101067A (zh) * | 2020-02-06 | 2020-05-05 | 鞍钢蒂森克虏伯汽车钢有限公司 | 一种烘烤硬化性能稳定的热镀锌钢板及其生产方法 |
| CN111809107A (zh) * | 2020-06-16 | 2020-10-23 | 包头钢铁（集团）有限责任公司 | 一种Ti系吨桶用热镀锌高强IF钢及其制造方法 |
-
2022
- 2022-05-18 CN CN202210546131.4A patent/CN114959427A/zh active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0432519A (ja) * | 1990-05-28 | 1992-02-04 | Nippon Steel Corp | 焼付硬化性の優れた深絞り用冷延鋼板の製造方法 |
| US20080251168A1 (en) * | 2005-09-23 | 2008-10-16 | Posco | Bake-Hardenable Cold Rolled Steel Sheet With Superior Strength and Aging Resistance, Gal-Vannealed Steel Sheet Using the Cold Rolled Steel Sheet and Method For Manufacturing the Cold Rolled Steel Sheet |
| US20080251167A1 (en) * | 2005-09-23 | 2008-10-16 | Posco | Bake-Hardenable Cold Rolled Steel Sheet With Superior Strength, Galvannealed Steel Sheet Using the Cold Rolled Steel Sheet and Method for Manufacturing the Cold Rolled Steel Sheet |
| CN111101067A (zh) * | 2020-02-06 | 2020-05-05 | 鞍钢蒂森克虏伯汽车钢有限公司 | 一种烘烤硬化性能稳定的热镀锌钢板及其生产方法 |
| CN111809107A (zh) * | 2020-06-16 | 2020-10-23 | 包头钢铁（集团）有限责任公司 | 一种Ti系吨桶用热镀锌高强IF钢及其制造方法 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110791705A (zh) | 一种汽车用340MPa级Ti-P系加磷高强IF钢带及其制造方法 | |
| CN107151763B (zh) | 薄规格高强度冷成型用热轧钢带及其生产方法 | |
| CN109136755B (zh) | 一种汽车用冷轧高强度钢及其生产方法 | |
| CN109136754B (zh) | 一种冷轧低合金高强度钢及其生产方法 | |
| CN114000048B (zh) | 一种公称直径12.5mm的预应力钢绞线用SWRH82B热轧盘条及其制备方法 | |
| CN103540845A (zh) | 屈服强度为330MPa级的热轧薄板搪瓷钢及制造方法 | |
| CN111809107A (zh) | 一种Ti系吨桶用热镀锌高强IF钢及其制造方法 | |
| CN106148821B (zh) | 加磷高强无间隙原子钢的生产工艺 | |
| CN113789480B (zh) | 一种冷锻齿轮钢及其制备方法 | |
| CN110358979A (zh) | 一种400MPa级冷轧高强IF钢及其制备方法 | |
| CN112011738B (zh) | 一种低成本复合稀土结构钢及其生产方法 | |
| CN102212747A (zh) | 一种低成本汽车大梁用钢及其制造方法 | |
| CN110144524A (zh) | 一种440MPa级冷轧无间隙原子高强钢及其CSP+BAF生产方法 | |
| CN117965840B (zh) | 低温钢的转炉控磷冶炼方法及高质量低温钢的生产方法 | |
| CN114645188A (zh) | 一种高效生产2~4mm极限薄规格抗拉强度650MPa级优质搅拌罐用热轧钢带的方法 | |
| CN117840395B (zh) | 低温钢的铸坯质量控制方法和板材生产方法 | |
| CN111826578B (zh) | 一种420MPa级冷轧低合金高强钢及其制造方法 | |
| CN113699431A (zh) | 一种减少低合金钢表面裂纹的方法 | |
| CN109234614B (zh) | 一种超超深冲级if钢的生产方法 | |
| CN114959427A (zh) | 一种汽车用180MPa级超低碳烘烤硬化钢的制造方法 | |
| CN111057828B (zh) | 一种高氧搪瓷钢及其生产方法 | |
| CN114032458A (zh) | 一种屈服强度620MPa级薄规格混凝土搅拌罐用热轧钢带的制备方法 | |
| CN113462960A (zh) | 一种340MPa级含铌热镀锌高强IF钢制备方法 | |
| CN115558838A (zh) | 一种低平整机延伸率控制的超深冲冷轧钢带的生产方法 | |
| CN118581310A (zh) | 一种汽车顶盖用冷轧烘烤硬化钢的制造方法 |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20220830 |
|
| RJ01 | Rejection of invention patent application after publication |