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Seamless Steel Pipe Normalizing, Quenching and Tempering Process
1) Normalizing of seamless steel pipe
Process: The steel parts are heated to 40~60°C above the critical temperature, kept for a certain period of time, and then cooled and heat treated in the air.
Pu...
5 Heat Treatment Processes for Seamless Steel Pipes
The heat treatment process of seamless steel pipe mainly includes the following 5 categories:
1. Quenching + high temperature tempering
The steel pipe is heated to the quenching temperature to trans...
How to Solve these Problems Encountered in Welding?
1. Cracks
Hot cracking, in the process of welding seam cooling, due to the sulfur and phosphorus impurities in the steel or welding material and the steel to form a variety of brittle and hard low-me...
Elimination of Scratches on the Surface of Welded Pipes
Causes of scratches on the surface of welded pipes (LSAW/SSAW/ERW Pipe):
The welded pipe using roll forming requires the strip to be bent into a circle transversely. This is achieved by deforming the...
Welding Process Parameters Affect the Shape of Submerged Arc Welding Seam
Submerged arc welding (SAW) is mainly suitable for welding at the flat welding position. If certain tooling aids are used, welding at fillet welding and horizontal welding positions can be realized. T...
China Removes VAT Rebate on Steel Exports, Cuts Tax on Raw Material Imports to Zero
China removes VAT rebate on steel exports, cuts tax on raw material imports to zero
1. Removes rebate on export of 146 steel products from May 1
2. Cuts import duty on pig iron, crude steel, recycl...
