Technical requirements for straight seam welded steel pipes:Technical requirements and inspection of straight seam welded steel pipes According to the GB3092 "Welded Steel Pipes for Low-Pressure Fluid Transport" standard, the nominal diameter of the welded steel pipe are 6~150mm, the nominal wall th

First, the accepted principle of spiral steel pipeThe quality inspection and acceptance of the spiral welded pipe shall be carried out by the technical quality supervision department of the supplier. The supplier must ensure that the delivered spiral welded pipe meets the requirements of the corresp

1. Multi-storey building fire pipe network settinga. When there are more than 10 indoor fire hydrants and the fire water consumption exceeds 15L/s, the indoor fire water supply pipeline should have at least two water inlet pipes connected to the outdoor pipe network, and the indoor pipes should be l

In the production process of stainless steel welded pipe, intermediate heat treatment and finished heat treatment can be carried out. Because a bright surface without oxidation can be obtained, the traditional pickling process is eliminated. The use of this heat treatment process not only improves t

1: Flange connection:Generally, the flange connection speed is fast, the construction is convenient, and the tools are simple, but in terms of safety and sealing, it cannot meet most engineering requirements. Generally, pipes with low pressure and frequently used pipes are suitable for this connecti

1. Thermomechanical treatmentHigh-temperature thermomechanical treatment can improve the yield ratio and elastic limit of the spiral steel pipe. Improve the comprehensive mechanical properties, fatigue properties, and stress relaxation properties of spiral steel pipes. Reducing the ductile-brittle t

1. Straight seam steel pipes should be submitted for acceptance in batches, and the batching rules should comply with the provisions of the corresponding product standards.2. The inspection items, sampling quantities, sampling locations, and test methods of straight seam steel pipes shall be by the

Thick-walled welded pipe is a kind of precipitation-strengthened nickel-based superalloy that is difficult to deform. It is similar in composition to the former Soviet Union's ЭИ929 alloy. The solid solution strengthening of alloy elements and the precipitation strengthening of γ' phase are very hig

Forming method of submerged arc steel pipe:Submerged arc steel pipe forming methods include continuous twist forming (HME), row roll forming method (CFE), UingOingExpanding forming method (UOE), roll bending forming method (RBE), JingCingOingExpanding forming method (JCOE), etc., but the most widely

1.316 stainless steel is a molybdenum-containing stainless steel. Due to the molybdenum in the steel, the overall performance of this steel is better than that of 310 and 304 stainless steel. Under high temperature conditions, when the concentration of sulfuric acid is lower than 15% and higher than