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    冷拔無縫鋼管的外觀質量和生產規范

    發布日期:2019-06-30 瀏覽次數:136

    冷拔無縫鋼管生產進程是將實心管坯或鋼錠穿成空心的毛管,然后再將其軋制成所要求尺度的鋼管。選用的穿孔和軋管辦法不同,就構成了出產冷拔無縫鋼管的不同辦法。焊接鋼管出產進程是將管坯(鋼板或帶鋼)曲折成管狀, 再把縫隙焊接起來成為鋼管。因采用的成型和焊接辦法不同,就構成了出產焊接鋼管的不同辦法。冷拔無縫鋼管首要用熱軋法出產。 揉捏法首要用于出產難穿孔的低塑性高合金鋼管或冷拔異型鋼管和復合金屬管。冷軋和冷拔法可將熱軋管繼續加工成小直徑和薄壁的鋼管。焊接鋼管工藝進程簡略、出產效率高、成本低、產品品種日益擴大。

    The production process of cold-drawn seamless steel tube is to pass solid billet or ingot into hollow capillary tube, and then roll it into required size steel tube. Different methods of piercing and rolling are used to produce cold-drawn seamless steel tubes. The production process of welded steel pipe is to bend the billet (steel plate or strip) into tubular shape, and then weld the gap into steel pipe. Because of the different forming and welding methods, the different methods of producing welded steel pipe are formed. Cold-drawn seamless steel pipes are mainly produced by hot rolling. The kneading method is mainly used to produce low-plastic high-alloy steel pipes or cold-drawn special-shaped steel pipes and composite metal pipes which are difficult to perforate. Hot-rolled pipes can be further processed into small diameter and thin-walled pipes by cold rolling and cold drawing. The process of welded steel pipe is simple, the production efficiency is high, the cost is low, and the product variety is expanding day by day. (1)規范:冷拔鋼管的規范要求應在進出口貿易合同中列明。一般應包括規范的商標(品種代號)、鋼筋的公稱直徑、公稱分量(質量)、規則長度及上述目標的允差值等各項。我國規范引薦公稱直徑為8、10、12、16、20、40mm的冷拔鋼管系列。供貨長度分定尺和倍尺二種。我國出口螺紋鋼定尺挑選規模為6~12m,日本產螺紋鋼定尺挑選規模為3.5~10m。

    (1) Specification: Specification requirements for cold-drawn steel pipes should be specified in import and export trade contracts. Generally, it should include the standard trademark (variety code), the nominal diameter of reinforcing bar, the nominal weight (quality), the regular length and the allowable difference of the above objectives. The cold-drawn steel pipe series with nominal diameters of 8, 10, 12, 16, 20 and 40 mm are recommended in Chinese codes. The length of supply is divided into two kinds: fixed length and double length. The selection scale of fixed length for export screw steel in China is 6-12m, and that for Japanese screw steel is 3.5-10m.


    (2)外觀質量:①外表質量。有關規范中對螺紋鋼的外表質量作了規則,要求端頭應切得平直,外表不得有裂縫、結疤和折迭,不得存在運用上有害的缺點等;②外形尺度誤差允許值 。螺紋鋼的曲折度及鋼筋幾許形狀的要求在有關規范中作了規則。如我國規范規則,直條鋼筋的曲折度不大于6mm/m,總曲折度不大于鋼筋總長度的0.6%。

    (2) Appearance quality: 1) Appearance quality. The external quality of threaded steel is regulated in the relevant codes, which requires that the ends should be cut straight, that there should be no cracks, scars and folds in the appearance, and that there should be no harmful defects in application, etc. (2) The allowable value of outline dimension error. The requirements for the bending degree of threaded steel and the shape of reinforcing bars are regulated in the relevant codes. For example, according to the code of our country, the bending degree of straight bars is not more than 6 m m/m, and the total bending degree is not more than 0.6% of the total length of bars.

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