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The X42 spiral steel pipe feeds the strip into the welded pipe mill. After rolling with multi-pass rollers, the strip is gradually rolled up to form a circular tube blank with an open gap. The reduction of the extrusion roll is adjusted to control the weld gap between 1 and 3 mm, and the weld gap between the two ends is also controlled. Qi Ping. 1. If the gap is too large, the proximity effect will be reduced, the eddy current heat will be insufficient, and the weld grain will not fuse or crack. 2. If the gap is too small, the adjacency effect will be increased, and the welding heat will be too large, resulting in weld burning loss; or the weld will be extruded and rolled to form a deep pit, affecting the surface quality of the weld. Heat the two edges of the tube to the welding temperature. 2. The amount of smoke and cold air in the pipe is larger than the amount of useful air inhaled by the dust collector. It is impossible to completely absorb the smoke and dust by cutting off the pipe.

  邱躍成：今年螺紋上漲【勝倉管業(yè) 袁經(jīng)理18903175665  QQ1623133043】我認為最重要的原因就是環(huán)保限產(chǎn)題材不斷在發(fā)酵，7月份我國粗鋼、生鐵和鋼材日均產(chǎn)量分別為262.06萬噸、217.81萬噸和308.68萬噸，環(huán)比6月分別下降2%、下降0.8%和下降3%。顯示各地環(huán)保限產(chǎn)持續(xù)發(fā)力，對鋼鐵生產(chǎn)形成抑制。為攻堅大氣污染防治，打贏藍天保衛(wèi)戰(zhàn)，高排放產(chǎn)業(yè)限制區(qū)域不再僅僅限于京津冀及周邊，長三角一市三省、汾渭平原等區(qū)域也將納入。涉及城市數(shù)量將從此前的2+26個，增加至80個，預計將有4億多噸鋼鐵產(chǎn)能在環(huán)保限產(chǎn)范圍之內。近期江蘇省發(fā)文要求粗鋼產(chǎn)能總量控制在1.15億噸以內，沿太湖、沿江、沿運河等區(qū)域的落后冶煉產(chǎn)能退出或搬遷，徐州2018年底前關停所有獨立煉鐵企業(yè)。8月17日，河北省去產(chǎn)能調結構現(xiàn)場推進會在唐山市召開，會議指出河北省各級各部門各單位要深刻認識到，去產(chǎn)能、調結構具有很強的政治性，必須作為踐行“四個意識”、落實“兩個維護”、堅決當好首都政治“護城河”的實際行動。當前環(huán)保限產(chǎn)已上升到政治高度，力度不斷加碼，對市場供應也將持續(xù)形成影響。【勝倉管業(yè) 袁經(jīng)理18903175665  QQ1623133043】