CN111468556A - 一种改善冷拔直缝焊管钩状裂纹的方法 - Google Patents

一种改善冷拔直缝焊管钩状裂纹的方法 Download PDF

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CN111468556A
CN111468556A CN202010095549.9A CN202010095549A CN111468556A CN 111468556 A CN111468556 A CN 111468556A CN 202010095549 A CN202010095549 A CN 202010095549A CN 111468556 A CN111468556 A CN 111468556A
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cold
hook
pipe
casting blank
welded pipe
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康海军
王旭生
张楠
于立伟
闵洪刚
姜艳菲
王文澜
董宝权
杨得草
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Bengang Steel Plates Co Ltd
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21CMANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
    • B21C37/08Making tubes with welded or soldered seams
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21BROLLING OF METAL
    • B21B1/00Metal-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
    • B21B1/46Metal-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 metal immediately subsequent to continuous casting
    • B21B1/463Metal-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 metal immediately subsequent to continuous casting in a continuous process, i.e. the cast not being cut before rolling
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING 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
    • C21D8/00Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0221Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
    • C21D8/0226Hot rolling
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING 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
    • C21D8/00Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0247Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
    • C21D8/0263Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment following hot rolling
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING 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
    • C21D2211/00Microstructure comprising significant phases
    • C21D2211/002Bainite

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatment Of Steel (AREA)

Abstract

本发明提供了一种改善冷拔直缝焊管钩状裂纹的方法,包括:第一步:按常规方法冶炼,浇注成铸坯;第二步:将铸坯置于步进式加热炉中加热,在高温环境中保温60min,铸坯出炉后进行除鳞箱除鳞后,进入粗轧机轧制,随后进入精轧机组轧制,终轧温度870℃,层流冷却后卷取;第三步:直缝焊接成钢管,冷拔后无损探伤,无钩状裂纹。可以更稳定的应用于工业化大生产冷拔直缝焊管用热轧钢卷,相比以往生产的热轧钢卷,可以实现无钩状裂纹缺陷。

Description

一种改善冷拔直缝焊管钩状裂纹的方法
技术领域
本发明涉及金属材料热处理领域,尤其涉及一种改善冷拔直缝焊管钩状裂纹的方法。
背景技术
冷拔钢管是钢管的一种,采用热轧钢卷直缝焊接后,再进行冷拔,性能优异、成本低廉。冷拔直缝焊管的生产工艺路径:热轧卷、分条、ERW 制管、退火、表面处理、冷拔、打压测试、退火、探伤、涂油包装。
直缝焊管冷拔易出现钩状裂纹,影响冷拔后的产品质量。围绕此类钩状裂纹国内外开展了大量工作,但工作均围绕着炼钢工序,控制钢水的非金属夹杂物提高钢水纯净度、控制化学成分偏析、裂纹等等,控制钢水的非金属夹杂物提高钢水纯净度:精炼过程让钢水中的非金属夹杂物充分上浮,最终吸附在钢渣中;开浇前中间包内用覆盖剂或者氩气进行保护。
现有冷拔直缝焊管的热轧钢卷原料采用卷取温度550~650℃的工艺进行生产,形成铁素体加珠光体组织,个别钢卷带状组织较重,会遗传到钢管中,钩状裂纹与非金属夹杂物有关,也与组织呈铁素体与珠光体交替条带状分布有关,这种组织与现有生产技术直接相关。铁素体与珠光体交替条带状分布的钢管,铁素体强度低容易变形,珠光体强度高不易变形,在外力作用下钢管无法均匀延伸造成开裂,多沿着珠光体与铁素体带状的交界处开裂和扩展。
发明内容
为了解决上述问题,本发明提供了一种改善冷拔直缝焊管钩状裂纹的方法。
本发明提供的技术方案是:一种改善冷拔直缝焊管钩状裂纹的方法,包括以下步骤:
第一步:按常规方法冶炼,浇注成铸坯;
第二步:将铸坯置于步进式加热炉中加热,在高温环境中保温60min,铸坯出炉后进行除鳞箱除鳞后,进入粗轧机轧制,随后进入精轧机组轧制,终轧温度870℃,层流冷却后卷取;
第三步:直缝焊接成钢管,冷拔后无损探伤,无钩状裂纹。
优选,最终由15个热轧钢卷,直缝焊接成钢管后冷拔。
进一步优选,在第二步中,直缝焊管用热轧钢卷的热轧工序卷取温度 300~450℃。
进一步优选,直缝焊管用热轧钢卷的组织以贝氏体组织为主,可以含有铁素体或铁素体加少量珠光体。
本发明提供了一种改善冷拔直缝焊管钩状裂纹的方法,可以更有效更稳定的应用于工业化大生产冷拔直缝焊管用热轧钢卷,相比以往生产的热轧钢卷,可以实现无钩状裂纹缺陷。采用卷取温度300~450℃比控制钢水非金属夹杂物,在工业化大生产中更容易实现,两者均能实现改善钩状裂纹缺陷的目的,但因为非金属夹杂物无法再炼钢过程中进行检测,无法实现稳定性控制,只能进行条件制约。而卷取温度可以在热轧过程中通过温度仪表直接反馈,控制更容易、更稳定,此外,生产过程中的热轧钢卷组织以贝氏体为主,使钢卷的组织更为均匀,减少或消除了铁素体或珠光体呈带状分布,组织协调变形的能力增强,不易在外力的作用下开裂。
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。
实施例一:以制作SPHT3为例,说明本发明的生产方法。
(1)按常规方法冶炼,浇注成铸坯;
(2)将铸坯置于步进式加热炉中加热,在1220℃的高温环境中保温60min,铸坯出炉后进行除鳞箱除鳞后,进入粗轧机轧制,开轧温度设为 1140℃,随后进入精轧机组轧制,终轧温度870℃,带钢厚度6.0mm,层流冷却后卷取,卷取温度设为400℃;
(3)直缝焊接成钢管,冷拔后无损探伤,无钩状裂纹。
实施例二:以制作SPHT3为例,说明本发明的生产方法。
(1)按常规方法冶炼,浇注成铸坯;
(2)将铸坯置于步进式加热炉中加热,在1210℃的高温环境中保温 60min,铸坯出炉后进行除鳞箱除鳞后,进入粗轧机轧制,开轧温度设为 1130℃,随后进入精轧机组轧制,终轧温度870℃,带钢厚度8.0mm,层流冷却后卷取,卷取温度设为380℃;
(3)直缝焊接成钢管,冷拔后无损探伤,无钩状裂纹。
实施例三:以制作SPHT52.3为例,说明本发明的生产方法。
(1)按常规方法冶炼,浇注成铸坯;
(2)将铸坯置于步进式加热炉中加热,在1240℃的高温环境中保温 60min,铸坯出炉后进行除鳞箱除鳞后,进入粗轧机轧制,开轧温度设为 1150℃,随后进入精轧机组轧制,终轧温度870℃,带钢厚度8.0mm,层流冷却后卷取,卷取温度设为350℃;
(3)直缝焊接成钢管,冷拔后无损探伤,无钩状裂纹。
本领域技术人员在考虑说明书及实践这里公开的发明后,将容易想到本发明的其它实施方案。本申请旨在涵盖本发明的任何变型、用途或者适应性变化,这些变型、用途或者适应性变化遵循本发明的一般性原理并包括本发明未公开的本技术领域中的公知常识或惯用技术手段。说明书和实施例仅被视为示例性的,本发明的真正范围和精神由权利要求指出。
应当理解的是,本发明并不局限于上面已经描述的内容,并且可以在不脱离其范围进行各种修改和改变。本发明的范围仅由所附的权利要求来限制。

Claims (4)

1.一种改善冷拔直缝焊管钩状裂纹的方法,其特征在于,包括:
第一步:按常规方法冶炼,浇注成铸坯;
第二步:将铸坯置于步进式加热炉中加热,在高温环境中保温60min,铸坯出炉后进行除鳞箱除鳞后,进入粗轧机轧制,随后进入精轧机组轧制,终轧温度870℃,层流冷却后卷取;
第三步:直缝焊接成钢管,冷拔后无损探伤,无钩状裂纹。
2.根据权利要求1所述的一种改善冷拔直缝焊管钩状裂纹的方法,其特征在于,最终由15个热轧钢卷,直缝焊接成钢管后冷拔。
3.根据权利要求1所述的一种改善冷拔直缝焊管钩状裂纹的方法,其特征在于,在第二步中,直缝焊管用热轧钢卷的热轧工序卷取温度300~450℃。
4.根据权利要求1所述的一种改善冷拔直缝焊管钩状裂纹的方法,其特征在于,直缝焊管用热轧钢卷的组织以贝氏体组织为主,可以含有铁素体或铁素体加少量珠光体。
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