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Large diameter stainless steel pipe price Stainless steel pipe manufacturers

Seamless steel pipe is divided into hot rolled and cold rolled (drawn) two kinds

Aug 21,2024

Large diameter stainless steel pipe price Stainless steel pipe manufacturers

Hot-rolled seamless steel pipe is divided into general steel pipe, low and medium pressure boiler steel pipe, high pressure boiler steel pipe, alloy steel pipe, stainless steel pipe, petroleum cracking pipe, geological steel pipe and other steel pipes.

In addition to the general steel pipe, low and medium pressure boiler steel pipe, high pressure boiler steel pipe, alloy steel pipe, stainless steel pipe, petroleum cracking pipe, other steel pipes, also includes carbon thin-wall steel pipe, alloy thin-wall steel pipe, stainless thin-wall steel pipe, special-shaped steel pipe. The outer diameter of the hot-rolled seamless pipe is generally greater than 32mm, the wall thickness is 2.5-75mm, the diameter of the cold-rolled seamless steel pipe can be up to 6mm, the wall thickness can be up to 0.25mm, the outer diameter of the thin-walled pipe can be up to 5mm, the wall thickness is less than 0.25mm, and the size accuracy is higher than that of the hot-rolled seamless pipe.

Stainless steel pipe classification: Stainless steel pipe is divided into two categories: seamless steel pipe and welded pipe.

For the stainless steel pipe under fluid pressure to carry out hydraulic tests to test its pressure resistance and quality, no leakage, wetting or expansion under the specified pressure qualified, some steel pipes also according to the standard or the requirements of the demander flange test, flaring test, flattening test, etc.

Generally used seamless steel pipe: It is made of 10#, 20#, 35#, 45# and other high-quality carbon-bonded steel 16Mn, 5MnV and other low alloy structural steel or 40Cr, 30CrMnSi, 40MnB and other alloy steel hot rolled or cold rolled. Seamless pipes made of low carbon steel such as 10 and 20 are mainly used for fluid transport pipelines. 45#, 40Cr and other medium carbon steel seamless pipe to manufacture mechanical parts, such as cars, tractor parts. Generally use seamless steel pipe to ensure the strength and flattening test. Hot-rolled steel pipes are delivered in hot-rolled or heat-treated condition; Delivered cold rolled in heat-treated condition.

The key production process of large diameter stainless steel pipe is as follows:

1. Plate probe: After the thick steel plate used for the production of large-caliber steel pipes enters the production line, the full plate ultrasonic detection is carried out first;

2. Milling: according to the milling machine, both sides of the thick steel plate are cut to achieve the specified plate width, plate edge flatness and weld appearance;

3, pre-bending edge: the use of pre-bending machine to carry out the plate edge pre-bending, so that the plate edge has the specified refractive index;

4, forming: In the JCO forming machine, the first half of the thick steel plate after pre-bending goes through several stepper motor stamping dies, grinding into a "J" shape, and then bending the other half of the thick steel plate, grinding into a "C" shape, and finally producing an open "O" shape.

5, welding treatment

8, all aspects of testing

10, expanding diameter: to expand the total length of submerged arc welded straight seam steel pipe to improve the precision of steel pipe specifications, and improve the spread of thermal stress of steel pipe;

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