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The national standard seamless steel tube is made by punching a steel ingot or a solid tube into a capillary tube, and then made by hot rolling, cold rolling or cold drawing. The national standard steel pipe has an important position in the steel pipe industry in China. What is the national standard of seamless steel pipe? What is the standard for the implementation of national standard seamless steel tubes? With the following Xiaobian look at the national standard seamless steel pipe specification table and the national standard seamless steel pipe implementation standards.
National standard seamless steel pipe
The national standard seamless steel tube is made by punching a steel ingot or a solid tube into a capillary tube, and then made by hot rolling, cold rolling or cold drawing. The national standard steel pipe has an important position in the steel pipe industry in China. According to incomplete statistics, China currently has about 240 national steel pipe production enterprises and about 250 seamless steel pipe units with an annual production capacity of about 4.5 million tons. From the point of view, <φ76, accounting for 35%, <φ159-650, accounting for 25%. From the perspective of varieties, the general-purpose pipe is 1.9 million tons, accounting for 54%; the oil pipeline is 760,000 tons, accounting for 5.7%; the hydraulic prop, precision pipe is 150,000 tons, accounting for 4.3%; the stainless pipe, bearing pipe, and automobile pipe are 50,000 in total. Ton, accounting for 1.4%.
The raw material for rolling the national standard steel tube is a round tube blank. The round tube blank is cut to a length of about 1 meter through a cutting machine, and is sent to a furnace for heating by a conveyor belt. The billets are heated in a furnace and the temperature is about 1200 degrees Celsius. The fuel is hydrogen or acetylene. Furnace temperature control is a key issue. After the tube blanks are released, they are put through the pressure puncher. The most common punching machine is a conical roller puncher. This puncher has high production efficiency, good product quality, large perforation diameter, and can wear a variety of steel types. After piercing, the round billet is successively rolled, rolled or extruded by three rolls. After squeezing, take off the sizing. The sizing machine drills through the cone at a high speed into the steel die to form a steel pipe. The inner diameter of the steel pipe is determined by the outer diameter length of the sizing machine drill. After the national standard steel pipe is sizing, it enters the cooling tower and is cooled by spraying water. After the steel pipe is cooled, it must be straightened. After straightening the steel pipe, it is sent to the metal detector (or hydraulic pressure test) by the conveyor belt for internal inspection. If there are cracks inside the pipe, air bubbles and other problems will be detected. After the quality inspection of steel pipes, strict manual selection is also required. After the quality inspection of the steel pipe, the paint is sprayed with the serial number, specifications and production lot number. And lifted into the warehouse by a crane.
Specification: The specification of seamless steel pipe is expressed in outside diameter * wall thickness mm.
National standard seamless steel pipe specification table
National Standard Seamless Steel Pipe Execution Standard
1. Structural seamless steel pipe: GB8162-2008
2. Pipes used to transport fluids: GB/T 8163-2008
3, boiler seamless steel tube: GB3087-2008
4. Boiler high pressure seamless pipe: GB5310-2008 (ST45.8-III type)
5, high-pressure seamless steel pipe for chemical fertilizer equipment: GB6479-1999
6. Geological drilling seamless steel pipe: YB235-70
7. Petroleum drilling seamless steel pipe: YB528-65
8, seamless steel pipe for oil cracking: GB9948-88
9, oil drill collar special seamless tube: YB691-70
10. Seamless steel tubes for automobile half shaft: GB3088-1999
11. Seamless steel tubes for ships: GB5312-1999
12, cold-drawn cold-rolled precision seamless steel pipe: GB3639-1999
13ã€All kinds of alloy pipes 16Mn, 27SiMn, 15CrMo, 35CrMo, 12CrMov, 20G, 40Cr, 12Cr1MoV, 15CrMo
In addition, GB/T17396-1998 (hot-rolled seamless steel pipe for hydraulic pillars), GB3093-1986 (high-pressure seamless steel pipe for diesel engine), GB/T3639-1983 (cold-drawn or cold-rolled precision seamless steel pipe), GB / T3094-1986 (cold-drawn seamless steel pipe shaped steel pipe), GB/T8713-1988 (hydraulic and pneumatic cylinder with precision inner diameter seamless steel pipe), GB13296-1991 (boiler, heat exchanger stainless steel seamless steel pipe), GB/T14975 -1994 (stainless steel seamless pipe for structural use), GB/T14976-1994 (stainless steel seamless pipe for fluid transfer) GB/T5035-1993 (seamless steel pipe for automotive half-axle casing), API SPEC5CT-1999 (sleeve and tubing) Specification) etc.
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stainless steel pipe
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