CN113416819A - 一种大厚度合金容器钢板的生产方法 - Google Patents
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 51
- 239000010959 steel Substances 0.000 title claims abstract description 51
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 20
- 229910045601 alloy Inorganic materials 0.000 title claims abstract description 19
- 239000000956 alloy Substances 0.000 title claims abstract description 19
- 238000005242 forging Methods 0.000 claims abstract description 37
- 238000000034 method Methods 0.000 claims abstract description 22
- 238000005096 rolling process Methods 0.000 claims abstract description 21
- 238000010791 quenching Methods 0.000 claims abstract description 13
- 230000000171 quenching effect Effects 0.000 claims abstract description 13
- 238000005496 tempering Methods 0.000 claims abstract description 12
- 238000000137 annealing Methods 0.000 claims abstract description 8
- 238000004512 die casting Methods 0.000 claims abstract description 8
- 238000010438 heat treatment Methods 0.000 claims description 9
- 238000005266 casting Methods 0.000 claims description 5
- 238000007711 solidification Methods 0.000 claims description 5
- 230000008023 solidification Effects 0.000 claims description 5
- 239000000126 substance Substances 0.000 claims description 3
- 229910052804 chromium Inorganic materials 0.000 claims description 2
- 229910052802 copper Inorganic materials 0.000 claims description 2
- 239000012535 impurity Substances 0.000 claims description 2
- 229910052748 manganese Inorganic materials 0.000 claims description 2
- 229910052750 molybdenum Inorganic materials 0.000 claims description 2
- 229910052759 nickel Inorganic materials 0.000 claims description 2
- 229910000851 Alloy steel Inorganic materials 0.000 claims 1
- 238000001514 detection method Methods 0.000 abstract description 10
- 239000013078 crystal Substances 0.000 abstract description 3
- 230000007547 defect Effects 0.000 abstract description 3
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- 238000009792 diffusion process Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
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- C—CHEMISTRY; METALLURGY
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- 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
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- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
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- B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
- B21J5/002—Hybrid process, e.g. forging following casting
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D7/00—Casting ingots, e.g. from ferrous metals
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- 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
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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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/004—Heat treatment of ferrous alloys containing Cr and Ni
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- 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
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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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/008—Heat treatment of ferrous alloys containing Si
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- 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
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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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0081—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for slabs; for billets
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- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
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- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
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- B21B1/38—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling sheets of limited length, e.g. folded sheets, superimposed sheets, pack rolling
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Abstract
一种大厚度合金容器钢板的生产方法,包括模铸、锻造、轧制、淬火、回火工序,所述锻造工序,将锻造锭锻造成坯,操作步骤为:S1:将锻造锭进行退火,退火温度为900‑940℃,保温32‑36h;S2:先将锻造锭镦粗至厚度为1500‑1700mm;然后将锻造锭拔长至厚度为450‑500mm,长度为7000‑7500mm。钢板经过探伤检验,全部满足NB/T47013.3‑2015及其第1号修改单T1级,采用单晶直探头检测直径Φ5‑8mm缺陷,检测结果为1‑8个/m2;钢板心部晶粒度达到8级以上,夹杂物(A类、B类、C类、D类、Ds类总和)≤2.5级,‑30℃冲击吸收能量≥120J。
Description
技术领域
本发明属于大厚度合金容器钢板生产技术领域,具体涉及一种大厚度合金容器钢板的生产方法。
背景技术
对于大厚度合金容器钢板,钢板心部(组织性能最薄弱处),要求严格的探伤质量、低冲击温度及高洁净度。随着钢板厚度增大,钢板轧制过程中变形量难以渗透到心部,造成钢板心部缩孔缺陷难以压合、组织无法充分细化、夹杂物难以压碎弥合。厚度增大,造成钢板心部组织性能变差,对于应用于高温高压状态下的设备而言,设备的使用效果及应用年限将受到严重影响。
为此,提高大厚度合金容器钢板心部质量至关重要,本发明专利采用锻造+轧制+淬火+回火的生产工艺,改善了大厚度合金容器钢板的探伤质量及组织性能。
发明内容
本发明解决的技术问题是,改善大厚度合金容器钢板心部质量。
为解决以上技术问题,本发明的技术方案是:一种大厚度合金容器钢板的生产方法,包括模铸、锻造、轧制、淬火、回火工序,所述锻造工序,将锻造锭锻造成坯,操作步骤为:
S1:将锻造锭进行退火,退火温度为900-940℃,保温32-36h;
S2:先将锻造锭镦粗至厚度为1500-1700mm;然后将锻造锭拔长至厚度为450-500mm,长度为7000-7500mm。
进一步的,所述锻造工序步骤S1中,锻造锭退火过程装炉温度为500-600℃。
进一步的,所述锻造工序步骤S2中,锻造温度为1180-1270℃。
进一步的,所述锻造锭通过钢液模铸生产得到,浇注过程中采用保温钢冒口,冒口处钢液凝固时间8-10h,浇注后20-24h脱模。
进一步的,所述轧制工序,轧制过程中轧制压力5000-6000t。
进一步的,所述轧制工序,将锻造坯料在加热炉加热后进行轧制,加热过程锻造坯料加热温度1240-1270℃,在炉时间8-10h。
进一步的,所述淬火工序,淬火温度930-950℃;所述回火工序,回火温度710-730℃。
进一步的,所述钢板成品单重40-50t,厚度170-200mm。
所述钢板成品为经过模铸、锻造、轧制、淬火、回火工序生产得到的钢板。
进一步的,所述钢板主要化学成分及其重量百分含量为:C 0.11-0.16%、Si≤0.10%、Mn 0.30-0.60、P≤0.008%、S≤0.008%、Cr 2.00-2.50、Mo 0.90-1.10%、Cu≤0.20%、Ni≤0.30%,其余为Fe及不可避免的杂质元素。
本发明设计思路为:浇注过程冒口凝固时间延长,可以减少钢液偏析;锻造锭脱模后进行高温长时退火处理,促进合金元素扩散,进一步减少成分偏析;锻造时采用先拔长再镦粗工艺,可以最大限度的将变形量渗透到钢板心部;轧制过程中大的轧制压力,进一步增大心部轧制压下量;钢板轧后进行淬火+高温回火处理,可以改善组织,提高性能。
采用上述技术方案所产生的有益效果在于:
1)钢板经过探伤检验,全部满足NB/T47013.3-2015及其第1号修改单T1级,采用单晶直探头检测直径Φ5-8mm缺陷,检测结果为1-8个/m2;
2)钢板心部晶粒度达到8级以上,夹杂物(A类、B类、C类、D类、Ds类总和)≤2.5级,-30℃冲击吸收能量≥120J;
3)本发明生产方法仅对生产工艺进行创新,未增加设备投入,生产成本较低。
具体实施方式
为了使本发明的目的、技术方案及优点更加清楚明白,以下结合实施例,对本发明进行进一步详细说明。应当理解,此处所描述的具体实施例仅仅用以解释本发明,并不用于限定本发明。
实施例1-8
钢板的化学成分及其质量百分含量见表1,生产过程包括模铸、锻造、轧制、淬火、回火工序,钢液经过模铸得到锻造锭,浇注过程中采用保温钢冒口,冒口处钢液凝固时间t冒见表2,钢液浇注后凝固脱模,浇注到脱模间隔时间t脱见表2。锻造工序,锻造锭退火入炉温度、退火温度、保温时间见表2,锻造过程锻造温度见表2,锻造锭先镦粗、再拔长,镦粗后锭的厚度h1见表2,拔长后锭的厚度h2、长度a见表2,锻造锭经过锻造后得到锻造坯料。
轧制工序将锻造坯料在加热炉加热后进行轧制,加热过程锻造坯料加热温度、在炉时间见表3,轧制过程轧制力见表3,淬火工序淬火温度、回火工序回火温度见表3,钢板成品单重、厚度见表3
表1
表2
表3
对实施例1-8钢板成品进行探伤,全部满足NB/T47013.3-2015及第1号修改单T1级,采用单晶直探头检测直径Φ5-8mm的缺陷,每块钢板检测出的缺陷个数见表4,对钢板夹杂物级别、-30℃冲击性能、心部晶粒度进行检测,检测结果见表4。
表4
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)
1.一种大厚度合金容器钢板的生产方法,包括模铸、锻造、轧制、淬火、回火工序,其特征在于,所述锻造工序,将锻造锭锻造成坯,操作步骤为:
S1:将锻造锭进行退火,退火温度为900-940℃,保温32-36h;
S2:先将锻造锭镦粗至厚度为1500-1700mm;然后将锻造锭拔长至厚度为450-500mm,长度为7000-7500mm。
2.根据权利要求1所述的一种大厚度合金容器钢板的生产方法,其特征在于,所述锻造工序步骤S1中,锻造锭退火过程装炉温度为500-600℃。
3.根据权利要求1所述的一种大厚度合金容器钢板的生产方法,其特征在于,所述锻造工序步骤S2中,锻造温度为1180-1270℃。
4.根据权利要求1所述的一种大厚度合金容器钢板的生产方法,其特征在于,所述锻造锭通过钢液模铸生产得到,浇注过程中采用保温钢冒口,冒口处钢液凝固时间8-10h,浇注后20-24h脱模。
5.根据权利要求1-4任一项所述的一种大厚度合金容器钢板的生产方法,其特征在于,所述轧制工序,轧制过程中轧制压力5000-6000t。
6.根据权利要求1-4任一项所述的一种大厚度合金容器钢板的生产方法,其特征在于,所述轧制工序,将锻造坯料在加热炉加热后进行轧制,加热过程锻造坯料加热温度1240-1270℃,在炉时间8-10h。
7.根据权利要求1-4任一项所述的一种大厚度合金容器钢板的生产方法,其特征在于,所述淬火工序,淬火温度930-950℃;所述回火工序,回火温度710-730℃。
8.根据权利要求1-4任一项所述的一种大厚度合金容器钢板的生产方法,其特征在于,所述钢板成品单重40-50t,厚度170-200mm。
9.根据权利要求1-4任一项所述的一种大厚度合金容器钢板的生产方法,其特征在于,所述钢板主要化学成分及其重量百分含量为:C 0.11-0.16%、Si≤0.10%、Mn 0.30-0.60、P≤0.008%、S≤0.008%、Cr 2.00-2.50、Mo 0.90-1.10%、Cu≤0.20%、Ni≤0.30%,其余为Fe及不可避免的杂质元素。
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EP3505651A1 (en) * | 2016-10-18 | 2019-07-03 | Jiangyin Xing Cheng Special Steel Works Co., Ltd | Toothed rack steel plate having thickness of 177.8 mm and manufactured by continuous casting billet and manufacturing method therefor |
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