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CN103484636B - 一种锻三通的生产工艺 - Google Patents

一种锻三通的生产工艺 Download PDF

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CN103484636B
CN103484636B CN201310399303.0A CN201310399303A CN103484636B CN 103484636 B CN103484636 B CN 103484636B CN 201310399303 A CN201310399303 A CN 201310399303A CN 103484636 B CN103484636 B CN 103484636B
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CN103484636A (zh
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呙文武
颜廷勇
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Tongyu Heavy Industry Co Ltd
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Abstract

本发明提供了一种锻三通的生产工艺,主要包括如下步骤:钢水经浇注、锻制成锻坯,然后热处理加工成毛坯,进一步锻造、快速冷却正火,最后经风冷、回火保温等工序,即得所述锻三通。采用本发明所述生产工艺生产得到的锻三通屈服强度Rel和抗拉强度Rm均高出技术要求50-70MPa,可满足其机械性能要求;组织为P+B+F,晶粒度5-6级,满足技术要求。试验证明,采用快速冷却正火可以显著提高锻三通的机械性能,晶粒度及组织均符合要求,尤其适于生产F22锻三通。

Description

一种锻三通的生产工艺
技术领域
本发明属于热处理制造技术领域,具体涉及一种锻三通的生产工艺。
背景技术
现生产的锻三通,技术要求为:屈服强度Rel≥310MPa,抗拉强度Rm≥515MPa,延伸率A≥20%,断面收缩率Z≥30%,常温冲击Akv≥27J,金相组织为珠光体(P)或贝氏体(B)+铁素体(F),晶粒度≥4级。根据要求正火很难满足机械性能要求,即使采取鼓风吹冷,性能也无法保证;若是调质处理可满足机械性能要求,但是无法满足金相组织为珠光体(P)+铁素体(F)的要求。
发明内容
为解决上述技术问题,本发明提供了一种锻三通的生产工艺。
本发明所述锻三通的生产工艺主要包括如下步骤:
步骤(1)采用电弧炉冶炼钢水,经真空脱气后浇注到钢锭模中,得到钢锭;
步骤(2)钢锭经1200-1250℃高温加热,用压机将钢锭锻制成锻坯;
步骤(3)锻坯经锻后热处理后,加工成毛坯;
步骤(4)将毛坯以≤60℃/h加热至700-750℃,保温2-4小时,然后以≤80℃/h加热至940-960℃,保温7-9小时后出炉快速冷却正火;
步骤(5)快速冷却正火,出炉空冷2-4分钟,水冷15-25秒,然后鼓风冷至200℃以下;
步骤(6)将风冷结束后的毛坯以≤60℃/h加热至600-650℃,回火保温14-18h后以≤30℃/h炉冷至300℃以下出炉,即得所述锻三通。
本发明所述生产工艺的有益效果:
1、  屈服强度Rel和抗拉强度Rm均高出技术要求50-70MPa,可满足其机械性能要求;
2、  组织为P+B+F,晶粒度5-6级,满足技术要求。
试验证明,本发明的步骤(5)采用快速冷却正火可以显著提高锻三通的机械性能,晶粒度及组织均符合要求,尤其适于生产F22锻三通。
具体实施方式
实施例1 快速冷却正火工艺
步骤(1)采用电弧炉冶炼钢水,经真空脱气后浇注到钢锭模中,得到钢锭;
步骤(2)钢锭经1200℃高温加热,用压机将钢锭锻制成锻坯;
步骤(3)锻坯经锻后热处理后,加工成毛坯;
步骤(4)将毛坯以≤60℃/h加热至700℃,保温4小时,然后以≤80℃/h加热至960℃,保温7小时后出炉快速冷却正火;
步骤(5)快速冷却正火,出炉空冷2分钟,水冷25秒,然后鼓风冷至200℃以下;
步骤(6)将风冷结束后的毛坯以≤60℃/h加热至600℃,回火保温18h后以≤30℃/h炉冷至300℃以下出炉,即得所述锻三通。
实施例2 快速冷却正火工艺
步骤(1)采用电弧炉冶炼钢水,经真空脱气后浇注到钢锭模中,得到钢锭;
步骤(2)钢锭经1250℃高温加热,用压机将钢锭锻制成锻坯;
步骤(3)锻坯经锻后热处理后,加工成毛坯;
步骤(4)将毛坯以≤60℃/h加热至750℃,保温2小时,然后以≤80℃/h加热至940℃,保温9小时后出炉快速冷却正火;
步骤(5)快速冷却正火,出炉空冷4分钟,水冷15秒,然后鼓风冷至200℃以下;
步骤(6)将风冷结束后的毛坯以≤60℃/h加热至650℃,回火保温14h后以≤30℃/h炉冷至300℃以下出炉,即得所述锻三通。
实施例3 普通正火工艺
步骤(1)将所得毛坯以≤60℃/h升至700-750℃保温2-4小时;
步骤(2)然后以≤80℃/h升至940-960℃保温7-9小时;
步骤(3)普通正火,出炉鼓风冷至200℃以下;
步骤(4)将风冷结束后的毛坯以≤60℃/h加热至600-650℃回火保温14-18h后以≤30℃/h炉冷至300℃以下出炉
不同生产工艺的性能对比:
普通正火工艺(实施例3)制得的锻三通性能如下:
快速冷却正火工艺(实施例1)制得的锻三通性能如下:
对比上述两工艺,快速冷却正火可以显著提高其机械性能,晶粒度及组织均符合要求。可见,快速冷却正火能够满足性能及组织要求。

Claims (1)

1.一种锻三通的生产工艺,其特征在于,主要包括如下步骤:
步骤(1)采用电弧炉冶炼钢水,经真空脱气后浇注到钢锭模中,得到钢锭;
步骤(2)钢锭经1200-1250℃高温加热,用压机将钢锭锻制成锻坯;
步骤(3)锻坯经锻后热处理后,加工成毛坯;
步骤(4)将毛坯以≤60℃/h加热至700-750℃,保温2-4小时,然后以≤80℃/h加热至940-960℃,保温7-9小时后出炉快速冷却正火;
步骤(5)快速冷却正火,出炉空冷2-4分钟,水冷15-25秒,然后鼓风冷至200℃以下;
步骤(6)将风冷结束后的毛坯以≤60℃/h加热至600-650℃,回火保温14-18h后以≤30℃/h炉冷至300℃以下出炉,即得所述锻三通。
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CN105252230B (zh) * 2015-12-01 2017-05-24 河北宏润核装备科技股份有限公司 一种斜三通的加工工艺
CN109423544A (zh) * 2017-08-28 2019-03-05 南京雄豹精密机械有限公司 一种直线导轨等温正火中冷却阶段的控制方法
CN107557540B (zh) * 2017-10-30 2018-11-06 山东伊莱特重工股份有限公司 一种a105锻件的控冷正火方法
CN112045123A (zh) * 2020-08-26 2020-12-08 刘海龙 一种45度锻制斜三通制备工艺

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