Posts by wilsonpipeline

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...

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...

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...

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 1. Removes rebate on export of 146 steel products from May 1 2. Cuts import duty on pig iron, crude steel, recycl...

Straight seam welded pipes, steel pipes made of hot-rolled or cold-rolled steel plates or steel strip coils welded on welding equipment, are all called straight seam welded pipes. (The name is given b...

Straight seam steel pipe is a steel pipe whose weld seam is parallel to the longitudinal direction of the steel pipe. It is generally pided into metric electric welded steel pipe, electric welded thin...

What are the weld requirements for straight seam steel pipes? 1. The height of the weld burr of the electric resistance welded steel pipe (ERW pipe) The external burrs of the steel pipe welds should...

Straight seam steel pipes can be pided into high-frequency straight seam steel pipes(ERW) and submerged arc welded straight seam steel pipes (LSAW) according to the production process. The most common...

Annealing process for seamless steel pipes: The seamless annealing of the seamless steel pipe is to heat the hypo-eutectoid steel to 30~50°C above the Ac3 temperature, and to the temperature range of ...