ERW Steel Pipe

    Welded steel pipe, also known as welded pipe, is a steel pipe made of steel plate or strip steel that is welded after being crimped and formed, and is generally 6 meters in length. Welded steel pipe production process is simple, high production efficiency, many varieties and specifications, less equipment investment, but the general strength is lower than seamless steel pipe. Welded steel pipes are divided into straight seam welded pipes(ERW pipe, LSAW pipe) and spiral welded pipes (SSAW pipe)in the form of welds.     Production Process     Straight seam welded pipe production process is simple, high production efficiency, low cost and rapid development. The strength of spiral welded pipe is generally higher than that of straight seam welded pipe. It is possible to use narrow blanks to produce welded pipes with larger diameters. It is also possible to produce welded pipes with different diameters from blanks of the same width. But compared with the ...

    Hydrostatic testing of pipelines involves pressure testing with water to verify their integrity and to detect possible leaks. Chemical additives (typically a corrosion inhibitor, an oxygen scavenger, and a dye) may be added.     In managing hydro-test waters, the following pollution prevention and control measures should be implemented:     (1) using the same water for multiple tests to conserve water and minimize discharges of potentially contaminated effluent;     (2) reducing the use of corrosion inhibiting or other chemicals by minimizing the time that test water remains in the equipment or pipeline;     (3) selecting the least hazardous alternative with regards to toxicity, biodegradability, bio-availability, and bio-accumulation potential;     (4) dosing according to local regulatory requirements and manufacturer recommendations.     http://www.xysteelpipe.com/info/Water-pressure-test-pollution-c...

    The surface quenching and tempering heat treatment of ERW pipe is usually carried out by induction heating or flame heating. The main technical parameters are surface hardness, local hardness and effective hardened layer depth. Hardness testing can use Vickers hardness tester, Rockwell or surface Rockwell hardness tester can also be used. The choice of test force (scale) is related to the depth of the effective hardened layer and the surface hardness of the straight seam welded pipe. Three types of hardness testers are involved here.     The Vickers hardness tester is an important method for testing the surface hardness of heat-treated straight seam welded pipes. It can use a test force of 0.5 to 100 kg to test the surface hardened layer as thin as 0.05 mm. Its accuracy is the highest and can distinguish the surface of the heat-treated workpiece. Small difference in hardness. In addition, the effective depth of the hardened layer must also be tested by the Vick...

    The oil casing pipe is made of seamless steel tubes. The rules adopted at the time of delivery are irregular, but they must also meet certain rules.     1. The domestic casing is in accordance with SY/T6194-96, the length of the casing is not fixed, and its range is 8-13m. However, casings no shorter than 6m can be provided, and the number must not exceed 20%.     2. There are three lengths specified in the API: R-1 is 4.88～7.62m, R-2 is 7.62～10.36m, R-3 is 10.36m to longer.     3. There must be no folds, hair lines, delamination, cracks, folds and scars on the inner and outer surfaces of the casing. These defects shall be completely removed, and the removal depth shall not exceed 12.5% of the nominal wall thickness.     4. According to the provisions of SY/T6194-96, domestic casings should be tied with steel wire or steel tape. The protective ring should be screwed on the exposed part of each casing and coupling thread to pr...

    Stainless steel welded pipe is a hollow long round steel material, mainly used in industrial transportation pipelines and mechanical structural parts such as petroleum, chemical industry, medical treatment, food, light industry, mechanical instrumentation, etc. In addition, when the bending and torsional strength are the same, the weight is light, so it is also widely used in the manufacture of mechanical parts and engineering structures.     1. Automotive industry     The main use of stainless steel is the exhaust system, accounting for more than 1/2 of the total amount of automotive stainless steel, and 80% is ferritic stainless steel. The exhaust gas generated by the automobile engine finally flows out of the muffler through the exhaust gas intake pipe, the front pipe, the hose, the converter, and the center pipe. Commonly used steel types for exhaust system are 409L, 436L, etc. Automotive mufflers mainly use stainless steel welded pipes. Accordi...