Bešavno čelik cijev

Seamless steel pipe is perforated by the whole round steel, and the steel pipe with no weld on the surface is called seamless steel pipe. According to the production method, the seamless steel pipe can be divided into hot-rolled seamless steel pipe, cold-rolled seamless steel pipe, cold-drawn seamless steel pipe, extruded seamless steel pipe, pipe jacking and so on. According to the section shape, the seamless steel pipe is divided into two kinds of round and shaped, shaped pipe has square, oval, triangle, hexagonal, melon seed, star, fin tube and many complex shapes. The maximum diameter is 900mm and the minimum diameter is 4mm. According to different uses, there are thick wall seamless steel pipes and thin wall seamless steel pipes. Seamless steel pipe is mainly used for petroleum geological drilling pipe, petrochemical cracking pipe, boiler furnace pipe, bearing pipe and high-precision structural steel pipe for automobiles, tractors and aviation.

① glavni proizvodnja proces vruće valjano bešavno čelik cijev (glavno inspekcija proces) :

Priprema i inspekcija cijevi gredice % e2% 86% 92 grijanje cijevi gredica % e2% 86% 92 perforacija % e2 / 86 / 92 valjanje cijevi % e2 / 86 % 92 podgrijavanje čelik cijev % e2 % 86 % 92 dimenzioniranje (smanjenje) % e2 % 86 / 92 toplinska obrada % e2 % 86 % 92 ravnanje gotova cijev % e2% 86 / 92 završna obrada % e2 % 86 % 92 inspekcija (nedestruktivno % 2c fizičko i kemijsko / 2c stol inspekcija) % e2 % 86 % 92 skladištenje

② Hladno valjano (izvučeno) bešavno čelik cijev glavno proizvodnja proces:

Prazno priprema % e2 % 86 % 92 dekapiranje podmazivanje % e2 % 86 % 92 hladno valjanje (izvlačenje) % e2 % 86 % 92 toplina obrada % e2 / 82 ravnanje % e2

General seamless steel pipe production process can be divided into two kinds of cold drawing and hot rolling, cold rolled seamless steel pipe production process is generally more complex than hot rolling, the tube billet first to carry out three roller continuous rolling, extrusion after sizing test, if the surface does not respond to the crack after the round tube to be cut by the cutting machine, cutting the growth of about one meter blank. Then enter the annealing process, annealing with acidic liquid pickling, pickling should pay attention to whether there is a large number of bubbles on the surface, if there is a large number of bubbles, indicating that the quality of the steel pipe can not meet the corresponding standards. The appearance of cold-rolled seamless steel pipe is shorter than that of hot-rolled seamless steel pipe, the wall thickness of cold-rolled seamless steel pipe is generally smaller than that of hot-rolled seamless steel pipe, but the surface looks brighter than that of thick-walled seamless steel pipe, the surface is not too rough, and the caliber is not too much burr.

The delivery state of hot-rolled seamless steel pipe is generally delivered after hot rolled heat treatment. Hot rolled seamless steel pipe after the quality inspection to go through the staff's strict manual selection, after the quality inspection to carry out the surface oil, and then followed by a number of cold drawing experiment, hot rolling treatment to carry out the test of perforation, if the perforation enlargement is too large to be straightener. After straightening, it is sent to the flaw detection machine by the transmission device for flaw detection experiment, and finally labeled, formatted and placed in the warehouse.

Okrugla cijev prazno % e2 % 86 % 92 grijanje % e2 % 86 % 92 perforacija % e2 % 86 % 92 tri valjka koso kotrljanje % 2c kontinuirano valjanje ili ekstruzija % e2 / 86 skidanje % e2 86% 92 dimenzioniranje (ili smanjenje) % e2 / 86 / 92 hlađenje % e2 / 82 voda tlak ispitivanje (ili inspekcija) % e2 / 86 / Označavanje % e2 / 86 / 92 bešavno čelik cijev u skladištenje je izrađeno od čelika ingot ili čvrsta cijev prazno kroz perforacija do izrada kapilara cijev 2c i zatim vruće valjanje % 2c hladno valjanje ili hladno crtanje. specifikacije bešavni čelik cijev su izraženi vanjski promjer * zid debljina od milimetara.

vanjski promjer toplo valjana bešavna cijev općenito veći od 32 mm% % 2c zid debljina je 2.{% 7b3% 7d% 7dmm% 2c vanjski promjer hladno valjani bešavni čelik cijev može biti 6 mm% 2c zid debljina može biti % 7b % 7b6 % 7 d / 7 mm / 2 vanjski promjer tanki zid cijev može biti 5 mm / 2 zid debljina je manje od % 7b % 7b10 % 7d % 7 d.2 mm % 2c i veličina točnost je veća nego that of the hot-rolled seamless pipe.

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