CN113416819A - 一种大厚度合金容器钢板的生产方法 - Google Patents

一种大厚度合金容器钢板的生产方法 Download PDF

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CN113416819A
CN113416819A CN202110546848.4A CN202110546848A CN113416819A CN 113416819 A CN113416819 A CN 113416819A CN 202110546848 A CN202110546848 A CN 202110546848A CN 113416819 A CN113416819 A CN 113416819A
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thickness
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李建朝
赵国昌
李�杰
侯敬超
龙杰
庞辉勇
袁锦程
吴艳阳
牛红星
尹卫江
李样兵
王东阳
顾自有
赵紫娟
岳欣欣
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Wuyang New Wide Heavy Steel Plate Co ltd
Wuyang Iron and Steel Co Ltd
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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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    • 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
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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
    • 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
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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
    • 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
    • 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
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    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
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    • B21B1/00—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
    • 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

一种大厚度合金容器钢板的生产方法
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
Figure DEST_PATH_IMAGE001
表2
Figure 812390DEST_PATH_IMAGE002
表3
Figure DEST_PATH_IMAGE003
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
Figure 854164DEST_PATH_IMAGE004
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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CN111826506A (zh) * 2020-06-08 2020-10-27 舞阳钢铁有限责任公司 一种锻造坯生产大厚度12Cr2Mo1VR钢板的方法

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CN105925894A (zh) * 2016-06-23 2016-09-07 江阴兴澄特种钢铁有限公司 一种超厚高强抗层状撕裂q500d-z35水电机组钢板及其制造方法
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
CN111826506A (zh) * 2020-06-08 2020-10-27 舞阳钢铁有限责任公司 一种锻造坯生产大厚度12Cr2Mo1VR钢板的方法

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Application publication date: 20210921