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Factors affecting the fatigue strength of seamless steel pipe materials: inclusions. The inclusion itself or the hole created by it is equivalent to a tiny gap, which will produce stress concentrat...

Acceptance of ERW,LSAW straight seam steel pipe: 1 The quality inspection and acceptance of straight seam steel pipes shall be carried out by the technical quality supervision department of the suppli...

1. Low temperature embrittlement of seamless steel pipes ------  In low temperature environment, deformation energy is small. In a low temperature environment, the phenomenon that the elongation and s...

There are many reasons for the longitudinal cracking of thick-walled seamless steel pipes, including material reasons and process reasons. Taking thick-walled seamless steel pipe as an example, if the...

Metals can react with oxygen in the atmosphere to form an oxide film on the surface. The iron oxide formed on ordinary carbon steel will continue to oxidize, causing the rust to continue to expand and...

In fact, oil casing collapse is a common form of damage to oil casing, but although it is common, how can oil casing pipe damage be prevented? The anti-collapse performance of oil casing has always be...

About the cleaning of oil casing bare pipe: The bare oil casing pipes are cleaned and arrive at the processing plant. Before the formal processing, the oil stain, lime soil, oxide scale rust and old c...

High frequency welding mainly uses the skin effect and proximity effect of high frequency current to make the current highly concentrated on the side to be welded, so that it can be heated to the weld...

The geometric dimensions of the welded tube blank mainly refer to the width and thickness and their allowable deviations. The longer the length of the welded tube blank, the better the production. The...

Longitudinal submerged arc welded pipe (LSAW) is generally made of steel plate as raw material. After different forming processes, double-sided submerged arc welding and post-weld diameter expansion a...