CN116287996A - 一种免热处理系泊链钢及其制造方法 - Google Patents
一种免热处理系泊链钢及其制造方法 Download PDFInfo
- Publication number
- CN116287996A CN116287996A CN202310198954.7A CN202310198954A CN116287996A CN 116287996 A CN116287996 A CN 116287996A CN 202310198954 A CN202310198954 A CN 202310198954A CN 116287996 A CN116287996 A CN 116287996A
- Authority
- CN
- China
- Prior art keywords
- percent
- less
- mooring chain
- steel
- 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
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 73
- 239000010959 steel Substances 0.000 title claims abstract description 73
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 22
- 238000010438 heat treatment Methods 0.000 claims abstract description 30
- 238000000034 method Methods 0.000 claims abstract description 23
- 229910000859 α-Fe Inorganic materials 0.000 claims abstract description 6
- 229910001562 pearlite Inorganic materials 0.000 claims abstract description 4
- 238000005096 rolling process Methods 0.000 claims description 28
- 238000009749 continuous casting Methods 0.000 claims description 16
- 238000007670 refining Methods 0.000 claims description 9
- 238000001816 cooling Methods 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 4
- 238000004321 preservation Methods 0.000 claims description 4
- 238000009849 vacuum degassing Methods 0.000 claims description 4
- 238000005242 forging Methods 0.000 claims description 3
- 238000005098 hot rolling Methods 0.000 claims description 3
- 238000010583 slow cooling Methods 0.000 claims description 3
- 238000009628 steelmaking Methods 0.000 claims description 3
- 239000008186 active pharmaceutical agent Substances 0.000 claims description 2
- 229910052799 carbon Inorganic materials 0.000 abstract description 6
- 230000002860 competitive effect Effects 0.000 abstract description 2
- 238000005272 metallurgy Methods 0.000 abstract 1
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 8
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 7
- 230000000694 effects Effects 0.000 description 7
- 239000010955 niobium Substances 0.000 description 7
- 239000001301 oxygen Substances 0.000 description 7
- 229910052760 oxygen Inorganic materials 0.000 description 7
- 238000003466 welding Methods 0.000 description 7
- 229910001566 austenite Inorganic materials 0.000 description 6
- 239000011651 chromium Substances 0.000 description 6
- 229910052758 niobium Inorganic materials 0.000 description 6
- 239000002244 precipitate Substances 0.000 description 6
- 238000005728 strengthening Methods 0.000 description 6
- 239000010936 titanium Substances 0.000 description 6
- 229910052719 titanium Inorganic materials 0.000 description 6
- 229910052720 vanadium Inorganic materials 0.000 description 6
- 229910045601 alloy Inorganic materials 0.000 description 5
- 239000000956 alloy Substances 0.000 description 5
- 238000005260 corrosion Methods 0.000 description 5
- 230000007797 corrosion Effects 0.000 description 5
- 239000011572 manganese Substances 0.000 description 5
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 5
- 238000010791 quenching Methods 0.000 description 5
- 230000000171 quenching effect Effects 0.000 description 5
- 238000005496 tempering Methods 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 4
- 239000010949 copper Substances 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 229910052757 nitrogen Inorganic materials 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 3
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 3
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 3
- 238000005275 alloying Methods 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 229910052802 copper Inorganic materials 0.000 description 3
- 239000013078 crystal Substances 0.000 description 3
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 description 3
- 238000001556 precipitation Methods 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 description 3
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 2
- 239000010953 base metal Substances 0.000 description 2
- 238000005266 casting Methods 0.000 description 2
- 229910001338 liquidmetal Inorganic materials 0.000 description 2
- 229910052748 manganese Inorganic materials 0.000 description 2
- NUJOXMJBOLGQSY-UHFFFAOYSA-N manganese dioxide Chemical compound O=[Mn]=O NUJOXMJBOLGQSY-UHFFFAOYSA-N 0.000 description 2
- 150000001247 metal acetylides Chemical class 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 150000004767 nitrides Chemical class 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- FBPFZTCFMRRESA-JGWLITMVSA-N D-glucitol Chemical compound OC[C@H](O)[C@@H](O)[C@H](O)[C@H](O)CO FBPFZTCFMRRESA-JGWLITMVSA-N 0.000 description 1
- 229910000640 Fe alloy Inorganic materials 0.000 description 1
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 1
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 229910001563 bainite Inorganic materials 0.000 description 1
- 238000009954 braiding Methods 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 230000001427 coherent effect Effects 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000004886 process control Methods 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000009466 transformation 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
- 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
- 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
-
- 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
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
-
- 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
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
-
- 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
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
-
- 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
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
-
- 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
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
-
- 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
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
-
- 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
- C21D2211/009—Pearlite
-
- 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 Steel (AREA)
Abstract
本发明涉及一种免热处理系泊链钢及其制造方法,属于冶金领域。该系泊链钢的元素成分为C:0.17~0.30%;Si:0.60~0.90%;Mn:0.5~2.0%;P≤0.015%;S≤0.005%;Cr:0.10~0.80%;Ni:0.10~0.90%;Cu:0.15~0.50%;Mo:0.02~0.30%;Nb:0.04~0.08%;Ti:0.0020~0.0050%;Al:≤0.020%;V:0.11~0.15%;N:0.008~0.015%;O:<0.0020%;其余为Fe。钢以热轧态交货,热轧态组织为珠光体+铁素体,以系泊链钢加工系泊链环,过程中免热处理。本方法对应的系泊链低碳环保,在目前能源紧张的时代,免热处理系泊链市场竞争优势将更加明显。对应的系泊链强韧性等各项性能指标均能达到船级社要求。
Description
技术领域
本发明属于铁基合金及其冶炼领域,具体涉及一种系泊链钢及其制造方法。
背景技术
本发明中的免热处理系泊链钢主要用于海洋平台系泊链的生产,指的是系泊链的免热处理。系泊链钢按其强度级别可以分为三级(R3)、三级半(R3S)、四级(R4)、四级半(R4S)、五级(R5)和六级(R6);其链环整体调质后的抗拉强度级别分别为690MPa、770MPa、860MPa、960Mpa、1000Mpa和1100MPa。系泊链钢在链条厂主要加工工序为:切割下料、编环焊接和高温淬火+高温回火热处理,热处理后环背组织为回火索氏体+贝氏体+铁素体混合组织;焊口组织为贝氏体+铁素体组织类型。
目前,焊接成环后的高温淬火和高温回火工序消耗大量的天然气和电能能源,因热处理造成的成本占系泊链生产成本的较大份额。同时也造成了系泊链生产周期长等问题。
开发免热处理的系泊链钢可以明显降低系泊链的生产成本,提高产品的市场竞争能力。
发明内容
本发明针对低钢级系泊链钢(R3或R3S)研发一款链条钢,所述钢在链条厂加工成链环后无需进行焊后热处理。主要通过在现有低级别系泊链钢(R3或R3S)合金体系基础上加入钒、钛、铌微合金化元素,使其在加热过程中溶于奥氏体中,因奥氏体中的钒、钛、铌的固溶度随着冷却而减小。在冷却阶段微合金元素钒、钛、铌将以细小的碳化物和氮化物形式在先析出的铁素体和珠光体中析出。这些析出物与母相保持共格关系,使钢强化,由于析出物属于纳米级析出物,有效阻止晶粒长大,起到细化晶粒的效果,实现强韧性与热处理态同等效果。
本发明的主要优势在于:通过省去链条淬火+高温回火热处理工艺,大大缩短了系泊链的制造流程,缩短了产品的生产周期,大大节省了能源,降低链环生产成本。为了实现上述目的,系泊链钢的轧制过程是控制难点,在轧前加热过程中,既要保证Nb、V、Ti充分固溶于奥氏体晶格中,又要保证出炉温度尽量低,为低温轧制做准备。
本发明的目的是要提供一种免热处理系泊链钢及其制造方法。本方法主要用于钢级为R3和R3S低钢级系泊链钢的制造,为客户提供了一款免热处理系泊链钢。
本发明采取的技术方案:一种免热处理系泊链钢,所述系泊链钢的元素质量百分含量为C:0.17~0.30%;Si:0.60~0.90%;Mn:0.5~2.0%;P≤0.015%;S≤0.005%;Cr:0.10~0.80%;Ni:0.10~0.90%;Cu:0.15~0.50%;Mo:0.02~0.30%;Nb:0.04~0.08%;Ti:0.0020~0.0050%;Al:≤0.020%;V:0.11~0.15%;N:0.008~0.015%;O:<0.0020%;其余为Fe。
系泊链钢以热轧态交货,热轧态组织为珠光体+铁素体,以系泊链钢加工系泊链环,过程中免热处理。
上述系泊链钢的制造方法,其特征在于:包括
步骤一、炼钢:采用转炉初炼、炉外精炼和真空脱气,控制钢中N和O的含量使满足设计要求,使连铸坯的夹杂物水平满足:A:0.5级及以下;B:0.5级及以下;C:0.5级及以下;D:0.5级及以下;DS:0.5级及以下;
步骤二、连铸:采用连铸工艺获得连铸坯,连铸坯入坑温度≥450℃;保温时间≥24h;起坑温度≤300℃;
步骤三、轧前加热炉炉温及升温速度控制:入加热炉温度≤900℃,加热升温速度≤100℃/h;
步骤四、轧制和轧后冷却:轧制采用一火轧制,轧制前加热至1250~1300℃后保温120min以上,开轧温度:850~1000℃,热轧或锻制成圆钢,终轧温度≤850℃;轧后空冷或缓冷。
优选地,步骤二中,连铸坯的断面尺寸为390mm*510mm。
与现有技术相比,本发明的优点在于:
本方法在成分上严格控制细化晶粒元素;化学成分中包含了Nb::0.04~0.08;Ti:0.0020~0.0050;V:0.11~0.15等细化晶粒微合金元素。起到通过析出强化和细晶强化下的高强韧性目的。添加氮元素,控制范围N:0.008~0.015;与Nb、V和Ti元素形成细小的氮化物,起到析出强化和细晶强化目的。同时控制氧,氧含量过多时,钢种纯净度收到较大的影响,大量的大颗粒氧化物夹杂物将影响钢的强度和韧性。
本方法采用炼钢和连铸生产工艺为;转炉初炼,为了获得较高的纯净度,经炉外精炼、真空脱气;控制钢种氧和氮元素含量,主要表现在夹杂物含量较低,夹杂物尺寸细小;90%以上夹杂物尺寸控制在10μm以下,最大夹杂物尺寸20μm以下;有效控制原始奥氏体晶粒尺寸提升强韧性;连铸坯入坑≥450℃;保温时间≥48h;起坑温度≤300℃。
本发明的有益效果在于:1)本发明对应的系泊链可以实现免热处理工序,大幅降低该系泊链能源消耗,降低生产成本。2)发明中的对应的系泊链生产效率高,系泊链生产周期中主要是由热处理决定的,当省去系泊链淬火+高温回火工艺后,可以大幅提升系泊链产品的生产效率。3)本方法对应的系泊链低碳环保,在目前能源紧张的时代,免热处理系泊链市场竞争优势将更加明显。4)本方法对应的系泊链强韧性等各项性能指标均能达到船级社要求。
具体实施方式
以下结合实施例对本发明作进一步详细描述,所述实施例是示例性的,旨在用于解释本发明,而不能理解为对本发明的限制。
1、成分设计。
本实施例中,化学成分百分含量%C:0.17~0.30;Si:0.60~0.90;Mn:0.5~2.0;P≤0.015;S≤0.005;Cr:0.10~0.80;Ni:0.10~0.90;Cu:0.15~0.50;Mo:0.02~0.30;Nb:0.04~0.08;Ti:0.0020~0.0050;Al:≤0.020;V:0.11~0.15;N:0.008~0.015;O:<0.0020;其余为Fe;化学成分中包含了细化晶粒微合金元素:Nb:0.04~0.08;Ti:0.0020~0.0050;V:0.11~0.15。同时添加氮元素N:0.008~0.015;氧元素低于20ppm。氧含量过多时,钢种纯净度收到较大的影响,大量的大颗粒氧化物夹杂物将影响钢的强度和韧性。五个实施例的元素含量参见表1。
本方法在成分上严格控制细化晶粒元素;为了实现钢的均匀性和强韧性强度,以下是本发明中主要合金元素的作用及其限定说明:
C:0.17~0.30;
碳可以提高钢的强度,同时又可以提高钢的淬透性。碳含量低于0.16%,不易达到强度要求,增加合金用量;高于0.30%,系泊链钢易产生制链焊接及热处理淬火裂纹。因此,须严格控制C含量。
Si:0.60~0.90
硅可提高钢的强度及淬透性,并和锰同样有脱氧效果,其链环环背和环冠等母材区域最低含量为0.15%才能有效果,但考虑到链环在闪光焊焊接过程中,氧气容易进入焊口及附近高温熔融态金属,造成高温液态金属中有益合金元素烧损,特别是细化晶粒元素Nb、V和Ti氧化烧损后,将降低焊口强度和韧性等性能指标。本发明规定下限为0.60;但过高会在钢中产生硅酸盐夹杂物,影响钢的使用性能,本发明设定其上限为0.90。
Mn:0.5~2.0;
锰是作为强淬透性元素,决定钢的强度和韧性重要元素。对组织和性能的均匀性影响特别突出。锰元素也是强脱氧元素,与Si同时起到脱氧效果,特别是在闪光焊焊接过程中,Mn可首先夺取流入焊口液态金属中的氧,生成MnO2,避免过多的有益合金元素烧损。本发明控制锰含量在0.5~2.0。
Cr:0.10~0.80;
铬是提高系泊链钢强度及淬透性的主要元素,其同时提高钢的抗腐蚀能力。但Cr含量不能过高,过高的Cr含量,将与钢中的C析出M23C6碳化物,该碳化物容易聚集长大并粗化,对钢的低温冲击韧性造成不利影响。本发明Cr含量控制在Cr:0.10~0.80;
Ni:0.10~0.90;
镍可以提高钢的淬透性,具有在保证强度的前提下而提高韧性的特点,镍是钢中耐候元素,有利于R3海洋系泊链链环的耐腐蚀性能。Ni在裂纹扩展过程中扮演着交滑移的作用,有利于提升焊口低温冲击韧性作用;但含量过高增加成本。为了达到同等提升焊口低温冲击韧性效果,本发明控制Ni含量0.10~0.90。
Mo:0.02~0.30;
钼提高钢的淬透性,防止回火脆性,显著提高钢的冲击韧性,钼也可以提高钢的耐蚀性。本发明微量添加Mo含量,控制范围0.02~0.30。
Al:≤0.02
铝是主要脱氧元素,能够形成AlN,细化晶粒,改善链条母材及焊缝处的综合力学性能。但本发明中已经加入了其他细化晶粒的合金元素,铝含量超过0.06%时,铝容易在闪光焊时高温氧化成灰斑缺陷,严重影响焊口质量和性能,其中主要降低焊口强度和低温冲击韧性,同时恶化链环服役性能,造成链环使用过程中的安全隐患,因此严格控制Al含量。
Cu:0.15~0.50;
铜在低含量时,可以适当提高钢的强韧性和耐候性,改善系泊链的耐候性。可以取得沉淀强化效果,显著增加钢的强度。铜和碳不能互溶,即不生成碳化物,因此在低碳钢中所有的铜将在铁素体中溶解或沉淀,产生轻微的强化作用。本发明控制范围:0.15~0.50。
P≤0.015;
P具有耐候性,但脆化原奥氏体晶界,降低韧性。含量多时还可能引起加工热裂纹。尽量控制P含量在0.015%及以下。
S≤0.005;
S易与Mn形成MnS夹杂,严重降低钢的强韧性和耐腐蚀性能,本发明严格控制在0.005及以下。
2、R3免热处理系泊链钢的制造工艺
1)按照表1所示的成分配比,采用转炉初炼,经炉外精炼、真空脱气后浇注成连铸坯;冶炼过程控制钢中氧和氮元素含量,主要表现在夹杂物含量较低,夹杂物尺寸细小;90%以上夹杂物尺寸控制在10μm以下,有效控制原始奥氏体晶粒尺寸的同时提升强韧性。钢水浇铸成390mm*510mm的连铸坯。
2)连铸坯入坑≥450℃;保温时间≥48h;起坑温度≤300℃。
3)轧制前加热炉炉温及升温速度控制;入加热炉温度≤900℃,实施例1的入炉温度:350℃;实施例2的入炉温度450℃;实施例3的入炉温度:500℃;实施例4的入炉温度:520℃;实施例5的入炉温度:530℃;加热升温速度≤100℃/h,优选70~80℃/h。
5)交货状态为热轧态。
所得系泊链钢经切割下料、编环焊接获得系泊链环,链环性能参见表2。
表1实施例具体成分
表2本实施例链环性能
本实施例中的钢材均是采用100t转炉冶炼,用连铸坯生产,对比例1为热处理的R3系泊链钢的典型性能一例。实施例对应的系泊链强韧性等各项性能指标均能达到船级社要求。
除上述实施例外,本发明还包括有其他实施方式,凡采用等同变换或者等效替换方式形成的技术方案,均应落入本发明权利要求的保护范围之内。
Claims (5)
1.一种免热处理系泊链钢,其特征在于:所述系泊链钢的元素质量百分含量为C:0.17~0.30%;Si:0.60~0.90%;Mn:0.5~2.0%;P≤0.015%;S≤0.005%;Cr:0.10~0.80%;Ni:0.10~0.90%;Cu:0.15~0.50%;Mo:0.02~0.30%;Nb:0.04~0.08%;Ti:0.0020~0.0050%;Al:≤0.020%;V:0.11~0.15%;N:0.008~0.015%;O:<0.0020%;其余为Fe。
2.一种免热处理系泊链钢,其特征在于:系泊链钢以热轧态交货,热轧态组织为珠光体+铁素体,以系泊链钢加工系泊链环,过程中免热处理。
3.根据权利要求1所述的免热处理系泊链钢的制造方法,其特征在于:包括
步骤一、炼钢:采用转炉初炼、炉外精炼和真空脱气,控制钢中N和O的含量使满足设计要求,使连铸坯的夹杂物水平满足:A:0.5级及以下;B:0.5级及以下;C:0.5级及以下;D:0.5级及以下;DS:0.5级及以下;
步骤二、连铸:采用连铸工艺获得连铸坯,连铸坯入坑温度≥450℃;保温时间≥24h;起坑温度≤300℃;
步骤三、轧前加热炉炉温及升温速度控制:入加热炉温度≤900℃,加热升温速度≤100℃/h;
步骤四、轧制和轧后冷却:轧制采用一火轧制,轧制前加热至1250~1300℃后保温120min以上,开轧温度:850~1000℃,热轧或锻制成圆钢,终轧温度≤850℃;轧后空冷或缓冷。
4.根据权利要求3所述的免热处理系泊链钢的制造方法,其特征在于:步骤二中,连铸坯的断面尺寸为390mm*510mm。
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN202310198954.7A CN116287996A (zh) | 2023-03-03 | 2023-03-03 | 一种免热处理系泊链钢及其制造方法 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN202310198954.7A CN116287996A (zh) | 2023-03-03 | 2023-03-03 | 一种免热处理系泊链钢及其制造方法 |
Publications (1)
Publication Number | Publication Date |
---|---|
CN116287996A true CN116287996A (zh) | 2023-06-23 |
Family
ID=86814442
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CN202310198954.7A Pending CN116287996A (zh) | 2023-03-03 | 2023-03-03 | 一种免热处理系泊链钢及其制造方法 |
Country Status (1)
Country | Link |
---|---|
CN (1) | CN116287996A (zh) |
-
2023
- 2023-03-03 CN CN202310198954.7A patent/CN116287996A/zh active Pending
Similar Documents
Publication | Publication Date | Title |
---|---|---|
CN109023119B (zh) | 一种具有优异塑韧性的耐磨钢及其制造方法 | |
CN110373607B (zh) | 一种高温渗碳钢、高温渗碳钢构件以及其制备方法 | |
CN113862558B (zh) | 一种屈服强度700MPa级低成本高韧性高强调质钢及其制造方法 | |
CN111286671B (zh) | 一种超纯净高温细晶粒齿轮钢、制造方法及其应用 | |
CN111455269A (zh) | 屈服强度960MPa级甚高强度海工钢板及其制造方法 | |
CN110846577A (zh) | 690MPa级高强度低屈强比中锰钢中厚钢及制造方法 | |
CN114574665B (zh) | 一种疲劳性能优异的船用高强韧性低温钢及制造方法 | |
CN114000056A (zh) | 一种屈服强度960MPa级低屈强比海工用钢板及其制备方法 | |
CN107287506A (zh) | 一种650MPa级中温中压锅炉钢板及其生产方法 | |
CN103361573A (zh) | 一种420MPa级含矾氮钢及其生产方法 | |
CN114438420A (zh) | 一种系泊链钢及生产工艺以及系泊链及生产工艺 | |
CN111893382B (zh) | 一种食品用链条不锈钢及其制备方法 | |
CN105200320A (zh) | 一种小规格圆环链用钢 | |
WO2023165611A1 (zh) | 一种在高废钢比下冶炼的高强韧耐蚀水下采油树阀体用钢及其热处理方法和生产方法 | |
CN112091473A (zh) | 一种Cr-Mo钢埋弧焊丝用线材及制造方法 | |
CN115354229B (zh) | 一种曲轴用非调质钢及其加工工艺 | |
CN113604736B (zh) | 一种屈服强度800MPa级高强度中厚板及其制备方法 | |
CN113621867B (zh) | 一种减少VD工序结合组分优化生产低成本20CrMoA圆钢的方法 | |
CN115261734A (zh) | 一种工程机械用高均质非调质钢及生产方法 | |
CN114134387A (zh) | 一种抗拉强度1300MPa级厚规格超高强钢板及其制造方法 | |
CN116287996A (zh) | 一种免热处理系泊链钢及其制造方法 | |
CN116121629B (zh) | 一种齿轮钢18CrNiMo7-6的制备方法 | |
CN116043106B (zh) | 一种高纯净度高韧性长服役周期冷作模具钢及其制备方法 | |
CN117248167B (zh) | 耐腐蚀工字钢及其生产方法 | |
CN111850413B (zh) | 一种易焊接耐疲劳的高强韧合金钢的制备方法 |
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 |