CN113245856B - 一种u型换热管的制造工艺 - Google Patents
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Abstract
本发明公开了一种U型换热管的制造工艺,工艺步骤如下:下料→快速穿孔→酸洗磷化皂化润滑→冷轧→无氧化退火→酸洗磷化皂化润滑→冷轧→无氧化正火→多点矫直→切头尾定长度→涡流、超声波探伤。采用所述的制造工艺能批量生产得到外径19.05mm×厚度2.11mm×长度32m的U型换热管,换热管的机械性能能达到如下要求:抗拉强度≥325MPa,屈服强度≥180MPa,延伸率≥35%,洛氏硬度HRB≤72。
Description
技术领域
本发明涉及管材加工工艺领域,具体涉及一种U型换热管的制造工艺。
背景技术
现有一种外径19.05mm×厚度2.11mm×长度32m的未弯折的U型换热管,该换热管机械性能需要达到如下要求:抗拉强度≥325MPa,屈服强度≥180MPa,延伸率≥35%,洛氏硬度HRB≤72。该种换热管由于超长且机械性能要求高,所以采用现有的加工工艺很难加工得到。
发明内容
本发明所要解决的技术问题是:将提供一种U型换热管的制造工艺,采用该制造工艺能批量生产得到机械性能符合要求、外径19.05mm×厚度2.11mm×长度32m的U型换热管。
为了解决上述问题,本发明所采用的技术方案为:一种U型换热管的制造工艺,工艺步骤如下:下料→快速穿孔→酸洗磷化皂化润滑→冷轧→无氧化退火→酸洗磷化皂化润滑→冷轧→无氧化正火→多点矫直→切头尾定长度→涡流、超声波探伤;其特征在于:
(1) 下料中:准备圆钢坯料,圆钢坯料的钢号为SA179、直径尺寸为φ50mm,将圆钢坯料在剪断机上剪断成段,从而得到一段段长度为1800mm的圆钢;
(2)快速穿孔中:在加热炉中对圆钢进行加热,首先将圆钢在800±10℃的温度下保温18~22分钟进行预热,然后从800±10℃匀速加热到1250±10℃,加热时间为13~17分钟,接着在1250±10℃的温度下,保温4~6分钟,从而来保证圆钢外部和芯部的温度一致性;圆钢出炉后马上在穿孔机组上进行穿孔,从而得到钢管,钢管的尺寸为外径51mm×厚度3.8mm×长度6200mm,穿孔的过程中,圆钢的温度保持在1150~1200℃之间,轧制速度为0.8±0.05米/秒,这样才能保证1800mm的圆钢在8秒内制成长6200mm的钢管;
(3)通过两次冷轧来代替冷拔工艺;
(4)多点矫直中:采用十七辊矫直机对U型换热管进行矫直,十七辊矫直机中设置有八对沿着前后方向布置的辊子,每对辊子由两个辊子组成,八对辊子从前向后依次分别为:第一对辊子、第二对辊子、第三对辊子、第四对辊子、第五对辊子、第六对辊子、第七对辊子、第八对辊子,第一、第二对辊子用来对U型换热管前进进行导向,第三、第四、第五对辊子调整为双曲线型来对U型换热管进行塑性变形,第六、第七对辊子用来保证U型换热管的直线度,第八对辊子作为出口导向辊,这样的布局方式能消除超长U型换热管热处理后形成的小弯,从而保证U型换热管的直线度为1/1000mm。
进一步的,前述的一种U型换热管的制造工艺,其中:无氧化退火中:热处理炉的温度为800~820℃,热处理时间为45±5分钟。
进一步的,前述的一种U型换热管的制造工艺,其中:冷轧在二辊冷轧机上进行。
进一步的,前述的一种U型换热管的制造工艺,其中:洗磷化皂化润滑中:钢管放置24小时后进行酸洗磷化皂化处理,酸洗:硫酸浓度3%~16%,硫酸中硫酸亚铁含量≤280g/L,酸缸温度40℃~60℃,酸洗时间30~50分钟;经过清水缸清洁后磷化,磷化液总酸度15drop~45drop,游离酸度0.3drop~1.5drop,磷化缸温度60℃~75℃,磷化时间20~40分钟;再经过清水缸清洁后皂化,皂化缸pH值为7.5~9,皂化缸温度60℃~80℃,皂化时间6~10分钟。
进一步的,前述的一种U型换热管的制造工艺,其中:皂化润滑中:皂化缸pH值为7.5~9,皂化缸温度60℃~80℃,皂化时间6~10分钟。
本发明的优点为:采用本发明所述的制造工艺能批量生产得到外径19.05mm×厚度2.11mm×长度32m的U型换热管,换热管的机械性能能达到如下要求:抗拉强度≥325MPa,屈服强度≥180MPa,延伸率≥35%,洛氏硬度HRB≤72。
具体实施方式
下面结合具体实施例对本发明作进一步的详细描述。
一种U型换热管的制造工艺,工艺步骤如下:下料→快速穿孔→酸洗磷化皂化润滑→冷轧→无氧化退火→酸洗磷化皂化润滑→冷轧→无氧化正火→多点矫直→切头尾定长度→涡流、超声波探伤;
(1)下料中:准备圆钢坯料,圆钢坯料的钢号为SA179、直径尺寸为φ50mm,将圆钢坯料在剪断机上剪断成段,从而得到一段段长度为1800mm的圆钢;
(2)快速穿孔中:在加热炉中对圆钢进行加热,首先将圆钢在800℃的温度下保温20分钟进行预热,然后从800℃匀速加热到1250℃,加热时间为15分钟,接着在1250℃的温度下,保温5分钟,从而来保证圆钢外部和芯部的温度一致性;圆钢出炉后马上在穿孔机组上进行穿孔,从而得到钢管,钢管的尺寸为外径51mm×厚度3.8mm×长度6200mm,穿孔的过程中,圆钢的温度保持在1150~1200℃之间,轧制速度为0.8米/秒,这样才能保证1800mm的圆钢在8秒内制成长6200mm的钢管;针对超长换热管设计的快速穿孔工艺解决了穿孔过程中钢管因前后温差太大引起的局部横裂的现象;
(3)酸洗磷化皂化润滑中:钢管放置24小时后进行酸洗磷化皂化处理,酸洗:硫酸浓度3%~16%,硫酸中硫酸亚铁含量≤280g/L,酸缸温度40℃~60℃,酸洗时间30~50分钟;经过清水缸清洁后磷化,磷化液总酸度15drop~45drop,游离酸度0.3drop~1.5drop,磷化缸温度60℃~75℃,磷化时间20~40分钟;再经过清水缸清洁后皂化,皂化缸pH值为7.5~9,皂化缸温度60℃~80℃,皂化时间6~10分钟;
(4)冷轧中:冷轧在二辊冷轧机上进行,轧制后钢管的尺寸为外径32mm×厚度2.8mm×长度15m;
(5)无氧化退火中:热处理炉的温度为800~820℃,热处理时间为45±5分钟;
(6)酸洗磷化皂化润滑中:钢管放置24小时后进行酸洗磷化皂化处理,酸洗:硫酸浓度3%~16%,硫酸中硫酸亚铁含量≤280g/L,酸缸温度40℃~60℃,酸洗时间30~50分钟;经过清水缸清洁后磷化,磷化液总酸度15drop~45drop,游离酸度0.3drop~1.5drop,磷化缸温度60℃~75℃,磷化时间20~40分钟;再经过清水缸清洁后皂化,皂化缸pH值为7.5~9,皂化缸温度60℃~80℃,皂化时间6~10分钟;
(7)冷轧中:冷轧在二辊冷轧机上进行,轧制后得到尺寸为外径19.05mm×厚度2.11mm×长度32.5m的U型换热管;
(8)在加热炉中对U型换热管进行无氧化正火
(9)多点矫直中:采用十七辊矫直机对U型换热管进行矫直,十七辊矫直机中设置有八对沿着前后方向布置的辊子,每对辊子由两个辊子组成,八对辊子从前向后依次分别为:第一对辊子、第二对辊子、第三对辊子、第四对辊子、第五对辊子、第六对辊子、第七对辊子、第八对辊子,第一、第二对辊子用来对U型换热管前进进行导向,第三、第四、第五对辊子调整为双曲线型来对U型换热管进行塑性变形,第六、第七对辊子用来保证U型换热管的直线度,第八对辊子作为出口导向辊,这样的布局方式能消除超长U型换热管热处理后形成的小弯,从而保证U型换热管的直线度为1/1000mm;
(10)切头尾定长度,最后得到尺寸为外径19.05mm×厚度2.11mm×长度32m的U型换热管;
(11)对U型换热管进行涡流、超声波探伤。
U型换热管制造完成后还需要弯折成蛇形。
本发明通过两次冷轧来代替冷拔工艺,如果采用传统冷拔工艺来制造超长管的话,对冷拔前一道的酸洗磷化皂化润滑工艺来说,需要的槽体会超过24米的长度,对于很多厂家来说无法做到。而二次冷轧就能很好解决这个问题,只需要常规18米的槽体就能生产出32米以上的超长管。就算槽体能满足的话,工艺道次会冷拔5次,而且最后2道为空拔,钢管内部会残留很多磷化液和润滑剂在里面,无法清除。经过最后成品热处理会牢牢粘附在钢管内壁,影响换热效率。而冷轧就不会出现这样的现象。二次冷轧的工艺制造成本相比冷拔工艺来说,下降了近40%。
Claims (5)
1.一种U型换热管的制造工艺,工艺步骤如下:下料→快速穿孔→酸洗磷化皂化润滑→冷轧→无氧化退火→酸洗磷化皂化润滑→冷轧→无氧化正火→多点矫直→切头尾定长度→涡流、超声波探伤;其特征在于:
(1)下料中:准备圆钢坯料,圆钢坯料的钢号为SA179、直径尺寸为φ50mm,将圆钢坯料在剪断机上剪断成段,从而得到一段段长度为1800mm的圆钢;
(2)快速穿孔中:在加热炉中对圆钢进行加热,首先将圆钢在800±10℃的温度下保温18~22分钟进行预热,然后从800±10℃匀速加热到1250±10℃,加热时间为13~17分钟,接着在1250±10℃的温度下,保温4~6分钟,从而来保证圆钢外部和芯部的温度一致性;圆钢出炉后马上在穿孔机组上进行穿孔,从而得到钢管,钢管的尺寸为外径51mm×厚度3.8mm×长度6200mm,穿孔的过程中,圆钢的温度保持在1150~1200℃之间,轧制速度为0.8±0.05米/秒,这样才能保证1800mm的圆钢在8秒内制成长6200mm的钢管;
(3)通过两次冷轧来代替冷拔工艺;
(4)多点矫直中:采用十七辊矫直机对U型换热管进行矫直,十七辊矫直机中设置有八对沿着前后方向布置的辊子,每对辊子由两个辊子组成,八对辊子从前向后依次分别为:第一对辊子、第二对辊子、第三对辊子、第四对辊子、第五对辊子、第六对辊子、第七对辊子、第八对辊子,第一、第二对辊子用来对U型换热管前进进行导向,第三、第四、第五对辊子调整为双曲线型来对U型换热管进行塑性变形,第六、第七对辊子用来保证U型换热管的直线度,第八对辊子作为出口导向辊,这样的布局方式能消除超长U型换热管热处理后形成的小弯,从而保证U型换热管的直线度为1mm/1000mm。
2.根据权利要求1所述的一种U型换热管的制造工艺,其特征在于:无氧化退火中:热处理炉的温度为800~820℃,热处理时间为45±5分钟。
3.根据权利要求1或2所述的一种U型换热管的制造工艺,其特征在于:冷轧在二辊冷轧机上进行。
4.根据权利要求1或2所述的一种U型换热管的制造工艺,其特征在于:酸洗磷化皂化润滑中:钢管放置24小时后进行酸洗磷化皂化处理,酸洗:硫酸浓度3%~16%,硫酸中硫酸亚铁含量≤280g/L,酸缸温度40℃~60℃,酸洗时间30~50分钟;经过清水缸清洁后磷化,磷化液总酸度15drop~45drop,游离酸度0.3drop~1.5drop,磷化缸温度60℃~75℃,磷化时间20~40分钟;再经过清水缸清洁后皂化,皂化缸pH值为7.5~9,皂化缸温度60℃~80℃,皂化时间6~10分钟。
5.根据权利要求1或2所述的一种U型换热管的制造工艺,其特征在于:皂化润滑中:皂化缸pH值为7.5~9,皂化缸温度60℃~80℃,皂化时间6~10分钟。
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