CN103290179B - 一种低淬透性中碳合金结构钢的热处理方法 - Google Patents

一种低淬透性中碳合金结构钢的热处理方法 Download PDF

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CN103290179B
CN103290179B CN201310220748.8A CN201310220748A CN103290179B CN 103290179 B CN103290179 B CN 103290179B CN 201310220748 A CN201310220748 A CN 201310220748A CN 103290179 B CN103290179 B CN 103290179B
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thermal treatment
treatment method
trimming
waste heat
alloy steel
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CN103290179A (zh
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刘均
沈运海
沈祁阳
蒲焕章
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HUNAN GOZ PRECISION MACHINERY Co.,Ltd.
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HENGYANG PENGRUN FORGING CO Ltd
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Abstract

本发明涉及一种金属材料的热处理方法，尤其是低淬透性中碳合金结构钢的热处理方法。本发明的实施工艺包括：下料—加热—预制坯—模锻成形—校正切边—淬火—回火—抛丸，下料后加热的温度为1100-1140℃，产品经过预制坯、模锻成形和校正切边后，在空气中停留10S左右，便放入余热槽内进行淬火，余热槽内的淬火介质由5-7﹪的HT-01溶液和93-95﹪的水组成。通过这样处理可将产品硬度控制在33～38HRC之间，心部组织可达到100%回火索氏体或100%回火屈氏体，抗弯强度提高了10%左右，无开裂件，完全满足并高于客户的要求，免去了按常规所需的再次加热，降低了电能等消耗，减少了劳动工时，改善了工作环境。

Description

一种低淬透性中碳合金结构钢的热处理方法
技术领域
本发明涉及一种金属材料的热处理方法，尤其是低淬透性中碳合金结构钢的热处理方法。
背景技术
现有技术中，通常是将锻后冷却到室温的产品放入箱式电阻炉中，重新加热到820-840℃并保温1小时，出炉后在水中搅动淬火，然后经430-450℃保温2小时回火，出炉空冷。采用以上方法，产品成本高，生产周期长，劳动强度大，并且产品质量合格率低，对于低淬透性合金结构钢，油淬无法保证硬度合格，淬透深度也浅，采取水淬虽然能达到硬度要求，但心部无法完全淬透而达不到技术要求，且水淬易导致工件开裂，所以必须100%磁粉探伤。
发明内容
本发明要解决的技术问题是提供一种能够降低成本、提高产品淬透性和强度的热处理方法。
为了解决上述技术问题，本发明的实施工艺包括：下料—加热—预制坯—模锻成形—校正切边—淬火—回火—抛丸，下料后加热的温度为1100-1140℃，产品经过预制坯、模锻成形和校正切边后，在空气中停留10S左右，便放入余热槽内进行淬火，余热槽内的淬火介质由5-7﹪的HT-01溶液和93-95﹪的水组成，回火工艺的温度控制为450-470℃，保温2小时，然后出炉空冷。
通过这样处理可将产品硬度控制在33～38HRC之间，心部组织可达到100%回火索氏体或100%回火屈氏体，抗弯强度提高了10%左右，无开裂件，完全满足并高于客户的要求，免去了按常规所需的再次加热，降低了电能等消耗，减少了劳动工时，改善了工作环境。
具体实施方式
1、棒料经中频电炉加热，为了保留高温形变锻热淬火的强韧化效果，将加热温度由常规的1180℃降至1100-1140℃，用红外测温仪检测，然后预制坯，模锻成形，校正切边。
2、切边后产品在空气中停留10S左右，保证工件温度控制在820～860℃之间，然后将之放入余热槽内进行淬火。内余热槽内的淬火介质由5-7﹪的HT-01溶液和93-95﹪的水组成。HT-01溶液是由水溶性有机高分子聚合物及少量添加剂溶合而成，工作液不燃烧，无油烟，无空气污染。该淬火介质可保证工件在高温区域冷速快而组织转变区域冷速慢，从而避免了淬火变形及开裂。
3、将淬火后的工件放入井式回火炉回火，回火温度460±10℃，保温时间2小时,每炉装1200件，然后出炉空冷即可。

Claims (1)

1.一种低淬透性中碳合金结构钢的热处理方法，其实施工艺包括：下料—加热—预制坯—模锻成形—校正切边—淬火—回火—抛丸，其特征在于：下料后加热的温度为1100-1140℃，产品经过预制坯、模锻成形和校正切边后，在空气中停留10s左右，便放入余热槽内进行淬火，余热槽内的淬火介质由5-7﹪的HT-01溶液和93-95﹪的水组成，所述回火工艺的温度为450-470℃，保温2小时，然后出炉空冷。
CN201310220748.8A 2013-06-05 2013-06-05 一种低淬透性中碳合金结构钢的热处理方法 Active CN103290179B (zh)

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CN106011395A (zh) * 2016-07-12 2016-10-12 山东鲁联机械制造有限公司 一种合金结构钢的锻热淬火热处理工艺

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
"42CrMo钢平衡轴锻件的锻造余热淬火";陈希原;《金属热处理》;20081231;第33卷(第3期);第94-96页 *
"锻造余热淬火工艺的应用前景";吴元徽;《热加工工艺》;20100930;第39卷(第18期);第195-196、199页 *

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