CN115572897B - 一种1500MPa级商用汽车箱体钢板及其制造方法 - Google Patents
一种1500MPa级商用汽车箱体钢板及其制造方法 Download PDFInfo
- Publication number
- CN115572897B CN115572897B CN202211137664.3A CN202211137664A CN115572897B CN 115572897 B CN115572897 B CN 115572897B CN 202211137664 A CN202211137664 A CN 202211137664A CN 115572897 B CN115572897 B CN 115572897B
- Authority
- CN
- China
- Prior art keywords
- percent
- steel plate
- mpa
- equal
- temperature
- 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.)
- Active
Links
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 98
- 239000010959 steel Substances 0.000 title claims abstract description 98
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 17
- 238000000034 method Methods 0.000 claims abstract description 35
- 238000001816 cooling Methods 0.000 claims abstract description 26
- 238000010438 heat treatment Methods 0.000 claims abstract description 14
- 238000005096 rolling process Methods 0.000 claims abstract description 14
- 238000010791 quenching Methods 0.000 claims abstract description 11
- 230000000171 quenching effect Effects 0.000 claims abstract description 11
- 239000000126 substance Substances 0.000 claims abstract description 8
- 238000005098 hot rolling Methods 0.000 claims abstract description 7
- 238000003723 Smelting Methods 0.000 claims abstract description 5
- 238000007670 refining Methods 0.000 claims abstract description 5
- 238000003856 thermoforming Methods 0.000 claims abstract description 5
- 239000012535 impurity Substances 0.000 claims abstract description 3
- 230000008569 process Effects 0.000 claims description 23
- 229910052799 carbon Inorganic materials 0.000 claims description 20
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 18
- 229910000859 α-Fe Inorganic materials 0.000 claims description 17
- 238000005554 pickling Methods 0.000 claims description 14
- 238000004321 preservation Methods 0.000 claims description 11
- 229910000734 martensite Inorganic materials 0.000 claims description 7
- 239000000498 cooling water Substances 0.000 claims description 6
- 230000009467 reduction Effects 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 4
- 238000005266 casting Methods 0.000 claims description 4
- 238000010079 rubber tapping Methods 0.000 claims description 3
- 238000003466 welding Methods 0.000 abstract description 11
- 239000002253 acid Substances 0.000 abstract description 8
- 238000005406 washing Methods 0.000 abstract description 8
- 238000009749 continuous casting Methods 0.000 abstract description 3
- 238000005272 metallurgy Methods 0.000 abstract description 2
- 239000010936 titanium Substances 0.000 description 16
- 239000011651 chromium Substances 0.000 description 11
- 238000005728 strengthening Methods 0.000 description 11
- 239000011572 manganese Substances 0.000 description 9
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 8
- 229910045601 alloy Inorganic materials 0.000 description 8
- 239000000956 alloy Substances 0.000 description 8
- 229910052804 chromium Inorganic materials 0.000 description 8
- 229910052719 titanium Inorganic materials 0.000 description 8
- 239000000463 material Substances 0.000 description 7
- 239000006104 solid solution Substances 0.000 description 7
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 6
- 238000001556 precipitation Methods 0.000 description 6
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 229910052748 manganese Inorganic materials 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 230000018109 developmental process Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000000446 fuel Substances 0.000 description 3
- 230000006872 improvement Effects 0.000 description 3
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- 238000004886 process control Methods 0.000 description 3
- 229910052710 silicon Inorganic materials 0.000 description 3
- 239000010703 silicon Substances 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 229910052717 sulfur Inorganic materials 0.000 description 3
- 230000007704 transition Effects 0.000 description 3
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 229910052698 phosphorus Inorganic materials 0.000 description 2
- 239000011574 phosphorus Substances 0.000 description 2
- 238000005204 segregation Methods 0.000 description 2
- 238000002791 soaking Methods 0.000 description 2
- 239000011593 sulfur Substances 0.000 description 2
- MTPVUVINMAGMJL-UHFFFAOYSA-N trimethyl(1,1,2,2,2-pentafluoroethyl)silane Chemical compound C[Si](C)(C)C(F)(F)C(F)(F)F MTPVUVINMAGMJL-UHFFFAOYSA-N 0.000 description 2
- RMLPZKRPSQVRAB-UHFFFAOYSA-N tris(3-methylphenyl) phosphate Chemical compound CC1=CC=CC(OP(=O)(OC=2C=C(C)C=CC=2)OC=2C=C(C)C=CC=2)=C1 RMLPZKRPSQVRAB-UHFFFAOYSA-N 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 206010063385 Intellectualisation Diseases 0.000 description 1
- 229910001182 Mo alloy Inorganic materials 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 229910001566 austenite Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000003763 carbonization Methods 0.000 description 1
- 229910052729 chemical element Inorganic materials 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000000979 retarding effect Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
Classifications
-
- 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
- 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
- C21D1/18—Hardening; Quenching with or without subsequent tempering
-
- 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
- C21D8/04—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing
- C21D8/0405—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing 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
- C21D8/04—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing
- C21D8/0421—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing characterised by the working steps
-
- 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
- C21D8/04—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing
- C21D8/0421—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing characterised by the working steps
- C21D8/0426—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
- C21D8/04—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing
- C21D8/0421—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing characterised by the working steps
- C21D8/0442—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
- C21D8/04—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing
- C21D8/0447—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing characterised by the heat treatment
-
- 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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with 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
-
- 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
- C21D2211/008—Martensite
-
- 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)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Sheet Steel (AREA)
Abstract
本发明公开了一种1500MPa级商用汽车箱体钢板及其制造方法,属于冶金技术领域。汽车箱体钢板化学成分及质量百分含量如下:C:0.20~0.25%,Si:0.15~0.25%,Mn:1.2~1.3%,P≤0.018%,S≤0.008%,N≤0.005%,Als:0.02~0.05%,Ti:0.03~0.045%,Cr:0.20~0.30%,其余为Fe及不可避免的杂质元素。制造方法包括冶炼、精炼、板坯连铸、板坯加热、热轧轧制、层流冷却、卷取、酸洗及平整、热成型及淬火工序。本发明汽车箱体钢板抗拉强度≥1500MPa,延伸率≥10%,组织细小均匀,具有良好的焊接性能和成形性,市场应用前景广阔。
Description
技术领域
本发明属于冶金技术领域,具体涉及一种1500MPa级商用汽车箱体钢板及其制造方法。
背景技术
国家“碳达峰,碳中和”双碳政策的提出,为汽车行业向绿色发展指明了方向,实现"低碳化、信息化、智能化"是未来汽车发展趋势。有研究显示,汽车整车重量降低10%,燃油效率可提高6-8%,汽车轻量化可显著提高燃油经济性,减小汽车自身重量,提高燃油效率是今后汽车技术发展的主要方向之一。
商用汽车箱体钢通常采用强度高、耐磨性好的耐磨钢板,已经商用化的耐磨钢主要有NM450、NM500、NM550等,其抗拉强度在1000~1400MPa,延伸率在8~11%,为满足材料的高强度及高耐磨性能,化学成分均含有较高的Cr、Ni、Mo元素,靠合金元素析出强化、沉淀强化达到钢板超高强和耐磨的目的。例如公开号为CN106811689A和公开号为CN113106338A的发明专利,为保证钢板的强度及耐磨性都采用较高的Nb、Cr、Ni、Mo合金,并且C含量0.30~0.55%,根据国际焊接协会给出碳当量计算公式Ceq=C+Mn/6+(Cr+V+Mo)/5+(Cu+Ni)/15,计算碳当量均>0.8%,当钢的碳当量≤0.5%时,钢的焊接性能优良,大于0.5%时,钢的焊接性会变差。而商用车箱体钢需要大量的焊接工艺,会影响用户的焊接效率及质量。
此类耐磨钢合金成本较高,并且用该方法生产的材料随着合金加入量的增多及强度提升,对主机厂冲压模具能力和改善材料冲压回弹都提出了更高的要求。因此,如何开发出合金成本低,加工回弹小的高强度耐磨材料是目前商用车箱体钢亟待解决的问题。
发明内容
本发明提供本发明涉及一种1500MPa级商用汽车箱体钢板及其制造方法,适用于具有耐磨要求的汽车箱体钢等。本发明产品规格为1.8-6.0mm。主要应用于专用渣土车箱体等商用车领域。
为实现上述目的,本发明采用的技术方案是:一种1500MPa级商用汽车箱体钢板,所述汽车箱体钢板化学成分及质量百分含量如下:C:0.20~0.25%,Si:0.15~0.25%,Mn:1.2~1.3%,P≤0.018%,S≤0.008%,N≤0.005%,Als:0.02~0.05%,Ti:0.03~0.045%,Cr:0.20~0.30%,其中Mn+Cr+Ti:1.5~1.6%,其余为Fe及不可避免的杂质元素。
本发明所述汽车箱体钢板屈服强度≥1000MPa,抗拉强度≥1500MPa,延伸率≥10%,碳当量≤0.5%。碳当量Ceq=C+Mn/6+(Cr+V+Mo)/5+(Cu+Ni)/15。
本发明所述汽车箱体钢板厚度为1.8~6.0mm,组织为马氏体+铁素体,铁素体晶粒尺寸为3~6μm,铁素体形态为针状铁素体。
本发明还提供上述一种1500MPa级商用汽车箱体钢板的制造方法,所述制造方法包括冶炼、精炼、板坯连铸、板坯加热、热轧轧制、层流冷却、卷取、酸洗及平整、热成型及淬火工序;所述热轧轧制工序,钢坯采用两阶段控轧制度,粗轧压下率控制在70~90%,中间坯温度1000~1070℃,精轧压下率控制在85~95%,终轧温度890~910℃;所述热成型及淬火工序,将酸洗后的钢板加热至900~920℃,保温时间保温时间T=H*1min/mm,出炉温度840-860℃,快速移动至模具内,在800~830℃温度范围合模进行热冲压,所述H为钢板厚度,单位为mm;冲压过程中开启水冷,冷却速率≥45℃/S,待温度降至150℃以下后开模。
本发明所述热成型及淬火工序,冲压过程中开启水冷,冷却水温≤20℃,为达到目标强度及高耐磨性,必须控制第二相粒子析出及相变温度点,合模温度满足公式:T合模≥725-34[C]+89[Si]+41[Mn]-132[Als]-3709[Nb]+330[Ti] -115[Cu]+61[Ni]+85[Cr],其中[C]等化学元素为百分含量。
本发明所述板坯加热工序,加热温度1220~1250℃,加热时间180~210min,均热时间35~55min。
本发明所述层流冷却工序,层流冷却采用前段1/2冷却模式,关闭前三组层流冷却水,控制冷却速率20~35℃/s。
本发明所述卷取工序,卷取温度控制在650~680℃,卷取后钢卷快速放入保温罩中保温,在保温罩中缓冷至300℃以下时取出。
本发明所述酸洗及平整工序,钢卷冷却至室温后进行酸洗,酸洗前对钢卷进行平整,平整延伸率为0.3~0.7%,酸洗液为盐酸,浓度为180~210g/l,酸洗液温度为70~85℃;钢板穿行速度为80~120m/min,酸洗过程中为带张力酸洗,张力为30~50kN。
本发明钢板化学成分设计思路:一、采用低C、Si、Mn固溶强化和Cr、Ti微合金化工艺,为保证良好焊接性和强度,其中1.5%≤Mn+Cr+Ti≤1.6%,碳当量≤0.5%,碳当量在易焊接范围内,具有良好的焊接性能。二、利用相变强化替代合金强化,具有低成本优势。
碳(C):碳固溶强化元素是钢板强度的保证,碳含量过低,钢板热冲压后强度达不到预期目标,碳含量过高,会对焊接性能不利,本发明选择的碳含量为0.20~0.25%。
硅(Si):硅是固溶强化元素,可通过固溶强化作用提高钢板强度,同时,其还具有提高钢板淬透性的作用。然而,Si含量过高会使热轧钢板表面出现大量氧化铁皮、色差等缺陷。本发明采用的硅含量0.15~0.25%。
锰(Mn):固溶强化元素,既可以提高钢的强度也能够改善钢的韧性。适度提高钢的淬透性,扩大γ相区,降低钢的γ→α相变温度,有助于获得细小的相变产物。此外,还要控制锰含量过高导致的偏析问题。因此,本发明钢采用的锰含量为1.2~1.3%。
钛(Ti):钛是钢中强脱氧剂。钛和碳、氮、氧都有极强的亲和力,它能使钢的内部组织致密,细化晶粒力;降低时效敏感性和冷脆性。改善焊接性能。钛在钢中只有加热到1000℃以上才能缓慢地融入固溶体中。在未融入之前,碳化钛颗粒有阻碍晶粒长大的作用。钛也是强铁素体形成元素之一,提高了钢的A1和A3温度。由于钛固定了氮和碳并形成碳化钛,碳化物析出可使钢的塑性和冲击韧性得到显著改善,有良好的力学性能和工艺性能。但粗大方形的Ti(CN)颗粒在材料拉伸过程中易形成裂纹源,导致材料提前开裂,所以钛元素量要控制在合理范围,并通过控制加热温度来控制Ti(CN)析出量。因此,本发明钢采用的钛含量为0.030~0.045%。
铬(Cr):能显著提高钢板的淬透性,能够保证钢板在淬火过程中快速形成马氏体组织,铬还能够有效抑制氢致开裂问题及提高钢的抗腐蚀性能,铬作为铁素体形成元素,可以得到更多的针状铁素体组织;然而,过量的铬将降低钢板的加工性能。因此,本发明钢采用铬含量为0.20~0.30%。
磷(P)、硫(S):在本发明中磷和硫是有害元素,P易于使铸坯出现偏析缺陷,S会形成MnS夹杂,恶化钢板显微组织、力学性能和冲击性能,本发明中P≤0.018%,S≤0.008%。
氮(N):N的含量越低越好,但过低会导致生产困难,增加成本,因此本发明中N含量≤0.005%。
本发明通过合理的成分设计,TMCP技术控制热轧态组织均匀性,同时采用一种特殊的热成形淬火工艺,根据合金成分计算精准合模温度,获得强度、塑性和韧性均优异的高强度箱体钢板。该高强度箱体钢板的组织为马氏体+铁素体组织,其中,铁素体晶粒尺寸为3~6um,铁素体形态为针状铁素体。该钢板在抗拉强度达到1500MPa以上,仍具有10%以上的延伸率。
采用上述技术方案所产生的有益效果在于:1、本发明采用低成本合金成分体系设计,生产成本低。为保证良好焊接性能,其中1.5≤Mn+Cr+Ti≤1.6;钢种采用C、Si、Mn固溶强化和Cr、Ti微合金化工艺,获得的成品组织以马氏体为主,以及少量的铁素体。2、本发明采用热轧TMCP轧制工艺及热成形控制工艺,生产出具有高强度和良好加工性能的高强箱体钢;冲压成型采用高温奥氏体区变形,以及变形后淬火冷却工艺,利用相变强化原理,降低合金成本改善材料的加工性能,解决高强耐磨钢成本高,加工回弹大焊接困难等问题。3、产品屈服强度≥1000MPa,抗拉强度≥1500MPa,延伸率≥10%,碳当量≤0.5%,具有合金成本低,成形性和焊接性能优良,回弹小的特点,市场需求广阔。
附图说明
图1为实施例1钢板500倍视野下的典型组织图;
图2为实施例1钢板1000倍视野下的典型组织图。
具体实施方式
下面结合具体实施例对本发明作进一步详细的说明。
实施例1-6
本发明一种1500MPa级商用汽车箱体钢板的制造方法,包括如下步骤:
(1)冶炼、精炼及板坯连铸
按目标化学成分进行冶炼、精炼、连铸浇铸成铸坯;
(2)板坯加热
加热温度1220~1250℃,加热时间180~210min,均热时间35~55min;各实施例控制参数见表1;
表1 实施例1-6板坯加热工序控制参数
(3)热轧轧制
钢坯采用两阶段控轧制度,粗轧压下率控制在70~90%,中间坯温度1000~1070℃,精轧压下率控制在85~95%,终轧温度890~910℃;各实施例控制参数见表2;
表2 实施例1-6热轧轧制及层流冷却工序控制参数
(4)层流冷却
层流冷却采用前段1/2冷却模式,关闭前三组层流冷水,控制冷却速率20-35℃/S;各实施例控制参数见表2;
(5)卷取
卷取温度控制在650~680℃,卷取后钢卷快速放入保温罩中保温,在保温罩中缓冷至300℃以下时取出;各实施例控制参数见表3;
(6)酸洗及平整
钢卷冷却至室温后进行酸洗,酸洗前对钢卷进行平整,平整延伸率为0.3~0.7%,酸洗液为盐酸,浓度为180~210g/l,酸洗液温度为70~85℃;钢板穿行速度为80~120m/min,酸洗过程中为带张力酸洗,张力为30~50kN;各实施例控制参数见表3;
表3 实施例1-6卷取、酸洗及平整工序控制参数
(7)热成形及淬火
成型过程将酸洗后的钢板加热至900~920℃,保温时间根据钢板厚度不同设定,保温时间T=H*1min/mm,出炉温度840~860℃,快速移动至模具内,在800~830℃温度范围合模进行热冲压,为达到目标强度及高耐磨性,必须控制第二相粒子析出及相变温度点,合模温度还需满足公式:T合模≥725-34[C]+89[Si]+41[Mn]-132[Als]-3709[Nb]+330[Ti]-115[Cu]+61[Ni]+85[Cr]。
冲压过程中开启水冷,冷却水温≤20℃,冷却速率≥45℃/S,待温度降至150℃以下后开模。各实施例控制参数见表4;
表4 实施例1-6卷取、酸洗及平整工序控制参数
各实施例生产得到1500MPa级汽车箱体钢板,化学成分及质量百分含量见表5,性能参数、厚度见表6。
表5 实施例1-6汽车箱体钢板化学组分及含量(单位:wt%)
表6 实施例1-6汽车箱体钢板厚度及性能参数
附图1、2为实施例1钢板500倍、1000倍视野下的典型组织图(其余实施例附图相同,故省略),从图中可以看出,本发明方法获得的钢板组织细小均匀,马氏体板条非常细小,代表组织具有良好的强韧性。
以上实施例仅用以说明而非限制本发明的技术方案,尽管参照上述实施例对本发明进行了详细说明,本领域的普通技术人员应当理解:依然可以对本发明进行修改或者等同替换,而不脱离本发明的精神和范围的任何修改或局部替换,其均应涵盖在本发明的权利要求范围当中。
Claims (9)
1.一种1500MPa级商用汽车箱体钢板,其特征在于,所述汽车箱体钢板化学成分及质量百分含量如下:C:0.20~0.25%,Si:0.15~0.25%,Mn:1.2~1.3%,P≤0.018%,S≤0.008%,N≤0.005%,Als:0.02~0.05%,Ti:0.03~0.045%,Cr:0.20~0.30%,其中Mn+Cr+Ti:1.5~1.6%,其余为Fe及不可避免的杂质元素;
所述汽车箱体钢板组织为马氏体+铁素体,铁素体含量10%-20%,其余为马氏体;所述铁素体晶粒尺寸为3~6μm,铁素体形态为针状铁素体。
2.根据权利要求1所述的一种1500MPa级商用汽车箱体钢板,其特征在于,所述汽车箱体钢板屈服强度≥1000MPa,抗拉强度≥1500MPa,延伸率≥10%,碳当量≤0.5%。
3.根据权利要求1所述的一种1500MPa级商用汽车箱体钢板,其特征在于,所述汽车箱体钢板厚度为1.8~6.0mm。
4.基于权利要求1-3任意一项所述的一种1500MPa级商用汽车箱体钢板的制造方法,其特征在于,所述制造方法包括冶炼、精炼、板坯连铸、板坯加热、热轧轧制、层流冷却、卷取、酸洗及平整、热成型及淬火工序;
所述热轧轧制工序,钢坯采用两阶段控轧制度,粗轧压下率控制在70~90%,中间坯温度1000~1070℃,精轧压下率控制在85~95%,终轧温度890~910℃;
所述热成型及淬火工序,将酸洗后的钢板加热至900~920℃,保温时间T=H*1min/mm,出炉温度840-860℃,快速移动至模具内,在800~830℃温度范围合模进行热冲压,所述H为钢板厚度,单位为mm;冲压过程中开启水冷,冷却速率≥45℃/s,待温度降至150℃以下后开模。
5.根据权利要求4所述的一种1500MPa级商用汽车箱体钢板的制造方法,其特征在于,所述热成型及淬火工序,冲压过程中开启水冷,冷却水温≤20℃。
6.根据权利要求4所述的一种1500MPa级商用汽车箱体钢板的制造方法,其特征在于,所述板坯加热工序,加热温度1220~1250℃,加热时间180~210min,均热时间35~55min。
7.根据权利要求4所述的一种1500MPa级商用汽车箱体钢板的制造方法,其特征在于,所述层流冷却工序,层流冷却采用前段1/2冷却模式,关闭前三组层流冷却水,控制冷却速率20~35℃/s。
8.根据权利要求4-7任意一项所述的一种1500MPa级商用汽车箱体钢板的制造方法,其特征在于,所述卷取工序,卷取温度控制在650~680℃,卷取后钢卷快速放入保温罩中保温,在保温罩中缓冷至300℃以下时取出。
9.根据权利要求4-7任意一项所述的一种1500MPa级商用汽车箱体钢板的制造方法,其特征在于,所述酸洗及平整工序,钢卷冷却至室温后进行酸洗,酸洗前对钢卷进行平整,平整延伸率为0.3~0.7%,酸洗液为盐酸,浓度为180~210g/l,酸洗液温度为70~85℃;钢板穿行速度为80~120m/min,酸洗过程中为带张力酸洗,张力为30~50kN。
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN202211137664.3A CN115572897B (zh) | 2022-09-19 | 2022-09-19 | 一种1500MPa级商用汽车箱体钢板及其制造方法 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN202211137664.3A CN115572897B (zh) | 2022-09-19 | 2022-09-19 | 一种1500MPa级商用汽车箱体钢板及其制造方法 |
Publications (2)
Publication Number | Publication Date |
---|---|
CN115572897A CN115572897A (zh) | 2023-01-06 |
CN115572897B true CN115572897B (zh) | 2024-02-09 |
Family
ID=84581169
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CN202211137664.3A Active CN115572897B (zh) | 2022-09-19 | 2022-09-19 | 一种1500MPa级商用汽车箱体钢板及其制造方法 |
Country Status (1)
Country | Link |
---|---|
CN (1) | CN115572897B (zh) |
Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102181790A (zh) * | 2011-05-09 | 2011-09-14 | 武汉钢铁(集团)公司 | 抗拉强度1300MPa级汽车安全件用钢及其生产方法 |
CN103320700A (zh) * | 2013-06-26 | 2013-09-25 | 武汉钢铁(集团)公司 | 一种1500MPa级汽车安全件用钢及其生产方法 |
CN104195443A (zh) * | 2014-05-19 | 2014-12-10 | 首钢总公司 | 汽车用高抗弯性能热成形钢及其制造方法 |
CN106086685A (zh) * | 2016-08-24 | 2016-11-09 | 武汉钢铁股份有限公司 | 用薄板坯直接轧制的抗拉强度≥1500MPa薄热成形钢及生产方法 |
CN111041382A (zh) * | 2019-12-03 | 2020-04-21 | 马鞍山钢铁股份有限公司 | 一种具有低高温摩擦系数的1800MPa级无镀层热成形钢及其制备方法 |
KR20210050806A (ko) * | 2019-10-29 | 2021-05-10 | 현대제철 주식회사 | 핫 스탬핑 부품 및 이의 제조방법 |
CN114214563A (zh) * | 2021-12-07 | 2022-03-22 | 武汉科技大学 | 用薄板坯轧制Rm≥1500MPa高韧性热冲压钢及生产方法 |
WO2022065797A1 (ko) * | 2020-09-25 | 2022-03-31 | 주식회사 포스코 | 연신율이 우수한 고강도 후물 열연강판 및 그 제조방법 |
-
2022
- 2022-09-19 CN CN202211137664.3A patent/CN115572897B/zh active Active
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102181790A (zh) * | 2011-05-09 | 2011-09-14 | 武汉钢铁(集团)公司 | 抗拉强度1300MPa级汽车安全件用钢及其生产方法 |
CN103320700A (zh) * | 2013-06-26 | 2013-09-25 | 武汉钢铁(集团)公司 | 一种1500MPa级汽车安全件用钢及其生产方法 |
CN104195443A (zh) * | 2014-05-19 | 2014-12-10 | 首钢总公司 | 汽车用高抗弯性能热成形钢及其制造方法 |
CN106086685A (zh) * | 2016-08-24 | 2016-11-09 | 武汉钢铁股份有限公司 | 用薄板坯直接轧制的抗拉强度≥1500MPa薄热成形钢及生产方法 |
KR20210050806A (ko) * | 2019-10-29 | 2021-05-10 | 현대제철 주식회사 | 핫 스탬핑 부품 및 이의 제조방법 |
CN111041382A (zh) * | 2019-12-03 | 2020-04-21 | 马鞍山钢铁股份有限公司 | 一种具有低高温摩擦系数的1800MPa级无镀层热成形钢及其制备方法 |
WO2022065797A1 (ko) * | 2020-09-25 | 2022-03-31 | 주식회사 포스코 | 연신율이 우수한 고강도 후물 열연강판 및 그 제조방법 |
CN114214563A (zh) * | 2021-12-07 | 2022-03-22 | 武汉科技大学 | 用薄板坯轧制Rm≥1500MPa高韧性热冲压钢及生产方法 |
Also Published As
Publication number | Publication date |
---|---|
CN115572897A (zh) | 2023-01-06 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
CN107619993B (zh) | 屈服强度750MPa级冷轧马氏体钢板及其制造方法 | |
CN111979489B (zh) | 一种780MPa级高塑性冷轧DH钢及其制备方法 | |
JP6306711B2 (ja) | 耐遅れ破壊特性を有するマルテンサイト鋼および製造方法 | |
US20190194774A1 (en) | Cold-rolled high-strength steel plate having excellent phosphating performance and formability and manufacturing method therefor | |
CN100471972C (zh) | 成形性优良的高强度钢板及其制造方法 | |
CN112095046B (zh) | 一种超高强度冷轧dh1180钢及其制备方法 | |
CN112048681A (zh) | 一种980MPa级高成形性冷轧DH钢及其制备方法 | |
KR101657822B1 (ko) | 연신특성이 우수한 용융아연도금강판, 합금화 용융아연도금강판 및 그 제조방법 | |
JPWO2014132968A1 (ja) | 焼き付け硬化性と低温靭性に優れた引張最大強度980MPa以上の高強度熱延鋼板 | |
CN110527915B (zh) | 一种460MPa级热轧H型钢及其生产方法 | |
WO2019003540A1 (ja) | 熱間プレス部材およびその製造方法ならびに熱間プレス用冷延鋼板およびその製造方法 | |
WO2013160928A1 (ja) | 高強度鋼板およびその製造方法 | |
CN113528944B (zh) | 一种1000MPa易成形耐磨钢板及其制备方法 | |
CN113832407B (zh) | 一种厚规格热成形钢的制备方法、热轧钢板及热成形钢 | |
KR20230024905A (ko) | 가소성이 우수한 초고강도 강 및 이의 제조 방법 | |
CN110846571A (zh) | 一种高韧性低合金耐磨钢厚板及其制造方法 | |
CN112877591A (zh) | 一种高强韧五金工具及链条用钢及其制造方法 | |
CA3180458A1 (en) | Electro-galvanized super-strength dual-phase steel resistant to delayed cracking, and manufacturing method therefor | |
US10400301B2 (en) | Dual-phase steel sheet with excellent formability and manufacturing method therefor | |
CN115612934A (zh) | 一种590MPa级别高成形性热镀锌双相钢板及其制备方法 | |
CN115572897B (zh) | 一种1500MPa级商用汽车箱体钢板及其制造方法 | |
JP7006849B1 (ja) | 鋼板、部材及びそれらの製造方法 | |
CN115210398B (zh) | 钢板、构件和它们的制造方法 | |
JP2002363685A (ja) | 低降伏比高強度冷延鋼板 | |
JP4205892B2 (ja) | プレス成形性と打抜き加工性に優れた高強度熱延鋼板及びその製造方法 |
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 | ||
GR01 | Patent grant | ||
GR01 | Patent grant |