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焊接钢管

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焊接钢管也称焊管,是用钢板或带钢经过卷曲成型后焊接制成的钢管.焊接钢管生产工艺简单,生产效率高,品种规格多,设备资少,但一般强度低于无缝钢管.20世纪30年代以来,随着优质带钢连轧生产的迅速发展以及焊接和检验技术的进步,焊缝质量不断提高,焊接钢管的品种规格日益增多,并在越来越多的领域代替了无缝钢管.焊接钢管按焊缝的形式分为直缝焊接钢管螺旋焊接钢管.
  焊接钢管采用的坯料是钢板或带钢,因其焊接工艺不同而分为炉焊管,电焊(电阻焊)管和自动电弧焊管.因其焊接形式的不同分为直缝焊接钢管和螺旋焊接钢管两种.因其端部形状又分为圆形焊接钢管和异型(方,扁等)焊接钢管.

厚壁焊接钢管 大口径焊接钢管 直缝焊接钢管
厚壁焊接钢管 大口径焊接钢管 直缝焊接钢管
高频焊接钢管 镀锌焊接钢管 公制焊接钢管
高频焊接钢管 镀锌焊接钢管 公制焊接钢管

焊接钢管分类方法
按焊接方法不同可分为电弧焊管,高频或低频电阻焊管,气焊管,炉焊管,邦迪管等.
电焊钢管:用于石油钻采和机械制造业等.
炉焊管:可用作水煤气管等,大口径直缝焊管用于高压油气输送等;螺旋焊管用于油气输送,管桩,桥墩等.
按焊缝形状可分为直缝焊管和螺旋焊管
直缝焊接钢管:生产工艺简单,生产效率高,成本低,发展较快.
螺旋焊接钢管:强度一般比直缝焊管高,能用较窄的坯料生产管径较大的焊管,还可以用同样宽度的坯料生产管径不同的焊管.但是与相同长度的直缝管相比,焊缝长度增加30~100%,而且生产速度较低.因此,较小口径的焊管大都采用直缝焊,大口径焊管则大多采用螺旋焊.
按用途又分为一般焊接钢管,镀锌焊接钢管,吹氧焊接钢管,电线套管,公制焊接钢管,托辊管,深井泵管,汽车用管,变压器管,电焊薄壁管,电焊异型管和螺旋焊接钢管.
一般焊接钢管:一般焊接钢管用来输送低压流体.用Q195A,Q215A,Q235A钢制造.也可采用易于焊接的其它软钢制造.钢管要进行水压,弯曲,压扁等实验,对表面质量有一定要求,通常交货长度为4-10m,常要求定尺(或倍尺)交货.焊管的规格用公称口径表示(毫米或英寸)公称口径与实际不同,焊管按规定壁厚有普通钢管和加厚钢管两种,钢管按管端形式又分带螺纹和不带螺纹两种.
镀锌焊接钢管:为提高钢管的耐腐蚀性能,对一般钢管(黑管)进行镀锌.镀锌钢管分热镀锌和电钢锌两种,热镀锌镀锌层厚,电镀锌成本低.
吹氧焊接钢管:用作炼钢吹氧用管,一般用小口径的焊接钢管,规格由3/8寸-2寸八种.用08,10,15,20或Q195-Q235钢带制成.为防蚀,有的进行渗铝处理.
电线套管:也是普通碳素钢电焊钢管,用在混凝土及各种结构配电工程,常用的公称直径从13-76mm.电线套套管壁较薄,大多进行涂层或镀锌后使用,要求进行冷弯试验.
公制焊接钢管:规格用无缝管形式,用外径*壁厚毫米表示的焊接钢管,用普通碳素钢,优质碳素钢或普能低合金钢的热带,冷带焊接,或用热带焊接后再经冷拨方法制成.公制焊管分普能和薄壁,普通用作结构件,如传动轴,或输送流体,薄壁用来生产家具,灯具等,要保证钢管强度和弯曲试验.
托辊管:用于带式输送机托辊电焊钢管,一般用Q215,Q235A,B钢及20钢制造,直径63.5-219.0mm.对管弯曲度,端面要与中心线垂直,椭圆度有一定要求,一般进行水压和压扁试验.
变压器管:用于制造变压器散热管和其它热交换器,采用普通碳素钢制造,要求进行压扁,扩口,弯曲,液压试验.钢管以定尺或倍尺交货,对钢管弯曲度有一定要求.
异型管:由普通碳结结构钢及16Mn等钢带焊制的方形管,矩形管,帽形管,空胶钢门窗用钢管,主要用作农机构件,钢窗门等.
电焊薄壁钢管:主要用来制作家具,玩具,灯具等.近年来不锈钢带制作的薄壁管应用很广,高级家具,装饰,栏栅等.
螺旋焊接钢管:是将低碳碳素结构钢或低合金结构钢钢带按一定的螺旋线的角度(叫成型角)卷成管坯,然后将管缝焊接起来制成,它可以用较窄的带钢生产大直径的钢管.螺旋焊接钢管主要用于石油,天然气的输送管线,其规格用外径*壁厚表示.螺旋焊接钢管有单面焊的和双面焊的,焊接钢管应保证水压试验,焊缝的抗拉强度和冷弯性能要符合规定.
按端部形状又分为圆形焊接钢管和异型(方,扁等)焊接钢管.

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