CN106555036A - 一种螺栓热处理工艺 - Google Patents

一种螺栓热处理工艺 Download PDF

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Publication number
CN106555036A
CN106555036A CN201611116249.4A CN201611116249A CN106555036A CN 106555036 A CN106555036 A CN 106555036A CN 201611116249 A CN201611116249 A CN 201611116249A CN 106555036 A CN106555036 A CN 106555036A
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Prior art keywords
bolt
temperature
heating processing
quenching
hours
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CN201611116249.4A
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罗华飚
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Hechi Technology Development Center
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Hechi Technology Development Center
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Priority to CN201611116249.4A priority Critical patent/CN106555036A/zh
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    • 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
    • C21D1/00General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/26Methods of annealing
    • C21D1/28Normalising
    • 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
    • C21D1/00General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/18Hardening; Quenching with or without subsequent tempering
    • 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
    • C21D1/00General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/56General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering characterised by the quenching agents
    • C21D1/60Aqueous agents
    • 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
    • C21D9/00Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/0093Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for screws; for bolts
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00Technologies related to metal processing
    • Y02P10/20Recycling

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

Abstract

本发明公开一种螺栓热处理工艺,包括以下步骤:(1)螺栓预热;(2)正火处理;(3)淬火处理和回火处理;(4)清洗。本发明提供一种螺栓的热处理工艺,其制得的螺栓断面收缩率小,配合率提高,废品率降低,并且避免使用对人体和环境有害的氰化物类渗剂。

Description

一种螺栓热处理工艺
技术领域
本发明涉及螺栓技术领域,特别是一种螺栓热处理工艺。
背景技术
强度高的螺栓的处理工艺是采用渗碳或氰化加淬火回火等工艺进行处理,并且采用850-900℃保温10 小时的完全退火工艺,但利用该工艺生产的螺栓在淬火时断面收缩率较大,变形率大,与螺母的配合率低,废品率有时会超过10%。
发明内容
为了克服现有的技术不足的问题,本发明提供一种螺栓热处理工艺。
本发明的技术方案是这样实现的:一种螺栓热处理工艺,包括以下步骤:
(1)将待处理螺栓预热4-5 小时,预热炉炉温360-370℃ ;
(2)正火处理,温度为800-1000℃,时间为7-8 小时,出炉空冷至室温;
(3)淬火处理,采用硝盐以50-55℃ / 分钟匀速淬火至在800-820℃,所述硝盐淬火剂为硝酸钾和硝酸钠按2:1 的质量比混合的淬火剂;油冷3-4 小时空冷,冷至300℃时回火,回火温度500-520℃,回火时间20-24 小时,出炉空冷至室温;
(4)清洗,立即作脱水封闭处理,即得成品。
本发明有益效果是:本发明提供一种螺栓的热处理工艺,其制得的螺栓断面收缩率小,配合率提高,废品率降低,并且避免使用对人体和环境有害的氰化物类渗剂。
具体实施方式
结合实施例对本发明做进一步的说明。
一种螺栓热处理工艺,包括以下步骤:
(1)将待处理螺栓预热4-5 小时,预热炉炉温360-370℃ ;
(2)正火处理,温度为800-1000℃,时间为7-8 小时,出炉空冷至室温;
(3)淬火处理,采用硝盐以50-55℃ / 分钟匀速淬火至在800-820℃,所述硝盐淬火剂为硝酸钾和硝酸钠按2:1 的质量比混合的淬火剂;油冷3-4 小时空冷,冷至300℃时回火,回火温度500-520℃,回火时间20-24 小时,出炉空冷至室温;
(4)清洗,立即作脱水封闭处理,即得成品。
本发明提供一种螺栓的热处理工艺,其制得的螺栓断面收缩率小,配合率提高,废品率降低,并且避免使用对人体和环境有害的氰化物类渗剂。
实施例1:一种螺栓热处理工艺,包括以下步骤:
(1)将待处理螺栓预热4.5 小时,预热炉炉温365℃ ;
(2)正火处理,温度为850℃,时间为7.5小时,出炉空冷至室温;
(3)淬火处理,采用硝盐以50-55℃ / 分钟匀速淬火至在810℃,所述硝盐淬火剂为硝酸钾和硝酸钠按2:1 的质量比混合的淬火剂;油冷3 小时空冷,冷至300℃时回火,回火温度510℃,回火时间22 小时,出炉空冷至室温;
(4)清洗,立即作脱水封闭处理,即得成品。
在此说明书中,本发明已参照其特定的实施例作了描述。但是,很显然仍可以做出各种修改和变换而不背离本发明的精神和范围。因此,说明书应被认为是说明性的而非限制性的。

Claims (1)

1.一种螺栓热处理工艺,其特征在于,包括以下步骤:
1)将待处理螺栓预热4-5 小时,预热炉炉温360-370℃ ;
2)正火处理,温度为800-1000℃,时间为7-8 小时,出炉空冷至室温;
3)淬火处理,采用硝盐以50-55℃ / 分钟匀速淬火至在800-820℃,所述硝盐淬火剂为硝酸钾和硝酸钠按2:1 的质量比混合的淬火剂;油冷3-4 小时空冷,冷至300℃时回火,回火温度500-520℃,回火时间20-24 小时,出炉空冷至室温;
4)清洗,立即作脱水封闭处理,即得成品。
CN201611116249.4A 2016-12-07 2016-12-07 一种螺栓热处理工艺 Pending CN106555036A (zh)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109628718A (zh) * 2017-10-09 2019-04-16 徐州东鹏工具制造有限公司 一种螺栓的热处理工艺

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05105957A (ja) * 1991-10-18 1993-04-27 Kawasaki Steel Corp 耐熱性高強度ボルトの製造方法
EP1681359A1 (en) * 2003-08-29 2006-07-19 National Institute for Materials Science High temperature bolt material
CN103643018A (zh) * 2013-11-26 2014-03-19 常熟市福熙机械零部件制造有限公司 螺栓的热处理工艺
CN103643239A (zh) * 2013-11-26 2014-03-19 常熟市福熙机械零部件制造有限公司 螺母的处理工艺
CN106119472A (zh) * 2016-08-25 2016-11-16 宁波金鼎紧固件有限公司 螺栓热处理工艺

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05105957A (ja) * 1991-10-18 1993-04-27 Kawasaki Steel Corp 耐熱性高強度ボルトの製造方法
EP1681359A1 (en) * 2003-08-29 2006-07-19 National Institute for Materials Science High temperature bolt material
CN103643018A (zh) * 2013-11-26 2014-03-19 常熟市福熙机械零部件制造有限公司 螺栓的热处理工艺
CN103643239A (zh) * 2013-11-26 2014-03-19 常熟市福熙机械零部件制造有限公司 螺母的处理工艺
CN106119472A (zh) * 2016-08-25 2016-11-16 宁波金鼎紧固件有限公司 螺栓热处理工艺

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109628718A (zh) * 2017-10-09 2019-04-16 徐州东鹏工具制造有限公司 一种螺栓的热处理工艺

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Application publication date: 20170405