Generally, the common cutting method of straight seam steel pipe is gas cutting. Gas cutting is to use the heat generated by the combustion of oxygen and acetylene to melt the cut metal at high temperature to produce iron oxide slag, and then blow the slag away from the metal with high-pressure oxygen flow.

Now, Let's us discuss the technical terms of steel pipes with you

The technical requirements galvanized steel pipe should reach. 1, grades and chemical composition. Galvanized steel grades and chemical composition shall comply with the stipulated GB3092 standard of black steel pipe steel. 2, the manufacture method: the manufacturing method of black steel pipe (furnace or electric welding) should be selected by the factory. Galvanized by hot dip galvanizing.

Process equipment distinction: cold drawn seamless steel pipe is usually 0.5 ~ 100T single-chain or double-chain cold drawn machine. Finished seamless steel tubes are usually carried out on a two-roll mill where the steel pipe is rolled in a ring-shaped bore formed by a variable cross-section round hole and a stationary tapered head.

ERW welded steel pipe: High frequency electric resistance welded pipe, raw material is hot rolled steel plate, through the continuous forming, bending, welding, heat treatment, sizing, straightening, cutting process.

Working pressure and diameter of oil and gas pipelines, are first identified in pipeline design framework technical parameters. Working pressure directly determine the number of pumping stations and compressor stations, steel consumption in the power station unit and piping.

Stainless steel does not readily corrode, rust or stain with water as ordinary steel does. However, it is not fully stain-proof in low-oxygen, high-salinity, or poor air-circulation environments. There are different grades and surface finishes of stainless steel to suit the environment the alloy must endure. Stainless steel is used where both the properties of steel and corrosion resistance are required.

Surface quality problems of steel pipe mainly shows in the surface oxide thick, surface cracking, surface re-skin, surface mechanical pumps and so on. After the completion of hot-rolled carbon steel, cold rolled steel and then heat treatment or after, it will form a thick and strong adhesion, high temperature oxide. Not only the existence of oxide steel looks poor quality, also affects the use of steel, which is not allowed by the standard.

According to the quality and performance of steel pipes, we have summarized the properties of different metal elements contained.

The tube is generally believed that non-metallic inclusions in the steel tube will destroy the continuity and compactness, severe inclusions will lead to appear the steel pipe delamination phenomena. Another thought is hydrogen induced cracking, namely due to hydrogen accumulation caused by metal steel internal gas pressure is too high, the formation of white spots in the round tube, crack extension occurs in the rolling process, and ultimately form a layered defects. In addition, the stress exceeds the strength of two rolls of plastic rotary piercing uneven deformation can also cause delamination.