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方矩管生产在拉断时所承受的最大力

发布时间:2019-05-19人气:31
方管导读 :无缝方矩管的力学性能是保证无缝方矩管最终使用性能(机械性能)的重要指标,它取决于钢管的化学成分和热处理制度。所以根据不同的使用要求,从抗拉强度、屈服点、伸长率这几方面来具体的介绍下大口径螺旋钢管的力学性能。

无缝方矩管的力学性能是保证无缝方矩管最终使用性能(机械性能)的重要指标,它取决于钢管的化学成分和热处理制度。所以根据不同的使用要求,从抗拉强度、屈服点、伸长率这几方面来具体的介绍下大口径螺旋钢管的力学性能。 The mechanical properties of seamless rectangular tubes are important indexes to ensure the ultimate performance (mechanical properties) of seamless rectangular tubes, which depends on the chemical composition of the tubes and the heat treatment system. Therefore, according to different requirements, the mechanical properties of large diameter spiral steel pipe are introduced in detail from the aspects of tensile strength, yield point and elongation. 

1 抗拉强度 试样在拉伸过程中,在拉断时所承受的最大力(Fb),出以试样原横截面积(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。

1. The maximum force (Fb) that a tensile strength specimen bears during the tensile process is the stress (_) obtained by the original cross-sectional area (So) of the specimen, which is called the tensile strength (_b), in units of N/mm2 (MPa). It represents the maximum resistance of metal materials to damage under tension. 

2 屈服点 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)。

2. The yield point is a metal material with yield phenomena. The stress at which the specimen can continue to elongate without increasing the force (keeping constant) during the tensile process is called the yield point. If the force decreases, the upper and lower yield points should be distinguished. The yield point is N/mm2 (MPa). 

3 断后伸长率 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%。

3. In the tensile test, the percentage of the length of the sample's gauge increased after breaking to the original gauge length is called elongation. In_, the unit is. 

今年上半年q345b方管市场价格将会出现“慢涨快跌”的一种运行状态,“慢涨”的原因是由于成本的推动,这种成本推动体现在钢厂因原料市场价格的上涨,生产成本上升,促使钢厂出厂价格的上调;再有,钢材贸易商的采购成本提高,后期投放市场的采购价格普遍增,但考虑到下游终端用户的承受能力,现货市场上的价格不会一下子大幅上涨,而表现为缓慢稳步而上。而“快跌”则是受宏观政策面、钢材金融属性以及人为的炒作等原因,一旦钢价出现震荡回落的情况,这些不利因素的叠加效应集中显现,导致市场价格的快速下跌。

In the first half of this year, the market price of Q345b square pipe will appear a kind of operation state of "slow rising and fast falling". The reason of "slow rising" is due to the promotion of cost. This kind of cost promotion is reflected in the increase of steel mill's ex-factory price due to the rise of raw material market price, the rise of production cost, and the increase of steel trader's purchase cost and the general purchase price put into the market later. However, considering the affordability of downstream end users, prices in the spot market will not rise sharply at once, but show a slow and steady upward trend. The "fast drop" is caused by macro-policy, steel financial attributes and artificial speculation. Once the steel price oscillates and falls, the superposition effect of these adverse factors concentrates, leading to the rapid decline of market prices. 

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