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    16mn厚壁无缝钢管哪里有卖
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    16mn厚壁无缝钢管哪里有卖

    发布时间:2018-12-18  

      16mn厚壁无缝钢管是含碳量为0.1%-0.25%,加入主要合金元素锰、硅、钒、铌和钛等.它的含合金总量<3%。按强度分为300、350、400和450MPa等4个级别。主要有Q295、Q345、Q390、Q420、Q460。:“Q”是屈服的“屈”字的汉语拼音大写字头,其后数字为该牌号最小屈服点(σs)值,其后的符号是按照该钢杂质元素(硫、磷)含量由高到低并伴随碳、锰元素的变化而分为A、B、C、D四等。其中A、B级钢通常称16Mn

    16mn厚壁无缝钢管

      16mn厚壁无缝钢管力学性能:

      钢材力学性能是保证钢材最终使用性能(机械性能)的重要指标,它取决于钢的化学成分和热处理制度。在钢管标准中,根据不同的使用要求,规定了拉伸性能(抗拉强度、屈服强度或屈服点、伸长率)以及硬度、韧性指标,还有用户要求的高、低温性能等。

      1:抗拉强度(σb)

      试样在拉伸过程中,在拉断时所承受的最大力(Fb),除以试样原横截面积(So)所得的应力(σ),称为抗拉强度(σb),单位为N/mm2(MPa)。它表示金属材料在拉力作用下抵抗破坏的最大能力。

      2:屈服点(σs)

      具有屈服现象的金属材料,试样在拉伸过程中力不增加(保持恒定)仍能继续伸长时的应力,称屈服点。若力发生下降时,则应区分上、下屈服点。屈服点的单位为N/mm2(MPa)。

      上屈服点(σsu):试样发生屈服而力首次下降前的最大应力; 下屈服点(σsl):当不计初始瞬时效应时,屈服阶段中的最小应力。

      屈服点的计算公式为:

      式中:Fs--试样拉伸过程中屈服力(恒定),N(牛顿)So--试样原始横截面积,mm2。

      3:断后伸长率(σ)

      在拉伸试验中,试样拉断后其标距所增加的长度与原标距长度的百分比,称为伸长率。以σ表示,单位为%。计算公式为:σ=(Lh-Lo)/L0*100%

      式中:Lh--试样拉断后的标距长度,mm; L0--试样原始标距长度,mm。

      4:断面收缩率(ψ)

      在拉伸试验中,试样拉断后其缩径处横截面积的最大缩减量与原始横截面积的百分比,称为断面收缩率。以ψ表示,单位为%。计算公式如下:

      式中:S0--试样原始横截面积,mm2; S1--试样拉断后缩径处的最少横截面积,mm2。

      5:硬度指标

      金属材料抵抗硬的物体压陷表面的能力,称为硬度。根据试验方法和适用范围不同,硬度又可分为布氏硬度、洛氏硬度、维氏硬度、肖氏硬度、显微硬度和高温硬度等。对于管材一般常用的有布氏、洛氏、维氏硬度三种。

      A、布氏硬度(HB)

      用一定直径的钢球或硬质合金球,以规定的试验力(F)压入式样表面,经规定保持时间后卸除试验力,测量试样表面的压痕直径(L)。布氏硬度值是以试验力除以压痕球形表面积所得的商。以HBS(钢球)表示,单位为N/mm2(MPa)。

      其计算公式为:

      式中:F--压入金属试样表面的试验力,N; D--试验用钢球直径,mm; d--压痕平均直径,mm。

      16mn厚壁无缝钢管)和薄壁钢管的最大区别在于钢管壁的厚度,一般说来,薄壁钢管都是冷拔技术,

      而厚壁钢管一般使用热轧技术,如果是用度量单位来区分的话,那么,一般认为,壁厚/管径等于0.05是厚壁钢管和薄壁钢管的分水岭,壁厚/管径小于0.05的是薄壁钢管,大于的是厚壁钢管,在用途上来说,薄壁钢管多用于管道上。而厚壁钢管多应用于空心零件的坯料。承压以及重要管道上使用。

      厚壁钢管主要应用于自来水工程、石化工业、化学工业、电力工业、农业灌溉、城市建设。作液体输送用:给水、排水。作气体输送用:煤气、蒸气、液化石油气。作结构用:作打桩管、作桥梁;码头、道路、建筑结构用管等。

    16mn厚壁无缝钢管

      16mn厚壁无缝钢管的化学成分:

      C:0.12~0.20; Mn:1.20~1.60; Si:0.20~0.55; 抗拉强度:470~660牛/平方毫米; 屈服强度:275~345牛/平方毫米; 伸长率:21%。具体值要根据钢材的厚度或直径,以上数据对应钢材的厚度或直径为:16~100mm

      16mn厚壁无缝钢管的用途:

      用于桥梁的专用钢种为“16Mnq”,汽车大梁的专用钢种为“16MnL”,压力容器的专用钢种为“16MnR”。

      16mn厚壁无缝钢管标准:

      GB/T8163-2008(输送流体用) GB6479-2000(高压化肥设备用无缝钢管)

      此类钢是依靠调整含碳(C)量来改善钢的力学性能,因此,根据含碳量的高低,此类钢又可分为:

      低碳钢--含碳量一般小于0.25%,如10、20钢等;

      中碳钢--含碳量一般在0.25~0.60%之间,如35、45钢等;

      高碳钢--含碳量一般大于0.60%。此类钢一般不用于制造钢管。


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