Ship Duilding tube specification table

Welded steel pipes refer to steel pipes with seams on the surface that are welded after bending and deforming steel strips or steel plates into round or square shapes. The production process of welded steel pipes is simple, the production efficiency is high, the steel pipes have many varieties and specifications, and the equipment is less, but the general strength is lower than seamless steel pipes. Since the 1930s, with the rapid development of high-quality strip continuous rolling production and the advancement of welding and inspection technology, the quality of welds has been continuously improved, and the variety and specifications of welded steel pipes have increased, and they have replaced non-products in more and more fields. Seam the steel pipe.

Choose to buy stainless steel pipes 1. Identify whether the steel stamped material "304" is printed on the surface of the pipe, and obtain the stainless steel pipe manufacturer's quality certificate and quality assurance certificate.

Cr5Mo alloy tube Average carbon content: 0.15%, chromium content: 4.00～6.00%, molybdenum content: 0.45～0.60%.

Welded pipe: the specification is in the form of seamless pipe, welded steel pipe expressed by outer diameter * wall thickness in millimeters, and metric welded pipe is welded with ordinary carbon steel, high-quality carbon steel or general energy low-alloy steel in the hot zone, cold zone, or hot zone Cold drawing method after welding

Shaped seamless steel pipe is a general term for seamless steel pipes with cross-sectional shapes other than round pipes.

The biggest difference between high frequency resistance welded pipe (Electric Resistance Welding, ERW) and seamless steel pipe is that ERW has a weld, which is also the key to the quality of ERW steel pipe.

Knowledge of steel pipe and square steel specifications, models and weight tables

Welded steel pipe weight

Flange is a disc-shaped part, which is the most common in pipeline engineering. Flanges are used in pairs. In pipeline engineering, flanges are mainly used for the connection of steel pipes. In the pipelines that need to be connected, a flange plate is installed in various ways. The low-pressure pipeline can use the wire flange, and the welding flange is used for the pressure above 4 kg. Add a sealing point between the two flanges, and then tighten them with bolts. Flanges with different pressures have different thicknesses and use different bolts. When water pumps and valves are connected to pipelines, parts of these equipment and equipment are also made into corresponding flange shapes, also known as flange connections. All connecting parts that are connected by bolts on the two planes and are closed at the same time are generally called "flanges", such as the connection of ventilation pipes. This type of parts can be called "flange parts". But this kind of connection is only a part of the equipment, such as the connection between the flange and the water pump, it is not good to call the water pump "flange parts". Smaller ones, such as valves, can be called "flange parts".

Most stainless steel products require good corrosion resistance. Some foreign merchants also conduct corrosion resistance tests on the products: use NACL aqueous solution to heat to boiling, pour the solution after a period of time, wash and dry, and weigh the weight loss to determine the damage. Corrosion degree (note: when the product is polished, because the emery cloth or sandpaper contains Fe components, it will cause rust spots on the surface during the test)

Seamless steel pipes have a hollow section and are used in large quantities as pipelines for transporting fluids, such as pipelines for transporting oil, natural gas, gas, water and certain solid materials. Compared with solid steel such as round steel, steel pipe is lighter when the bending and torsion strength is the same. It is a kind of economical cross-section steel, which is widely used in the manufacture of structural parts and mechanical parts. 1. The diameter of the pipe can be divided into outer diameter. , Inner diameter, nominal diameter. The outer diameter of a seamless steel pipe is indicated by the letter D, followed by the size and wall thickness of the outer diameter. For example, a seamless steel pipe with an outer diameter of 108, with a wall thickness of 5MM, is represented by D108*5, plastic pipe It is also expressed by outer diameter, such as De63. Others such as reinforced concrete pipes, cast iron pipes, galvanized steel pipes, etc. are expressed by DN. In the design drawings, the nominal diameter is generally used to express. The nominal diameter is artificially specified for the convenience of design, manufacture and maintenance. One of the standards, which is also the nominal diameter, is the specification name of the pipe (or fitting).

When brown rust spots (spots) appear on the surface of stainless steel pipes, some people think that "stainless steel does not rust, and rust is not stainless steel. It may be that there is a problem with the steel." In fact, some stainless steel materials with low nickel content are rusty, so the rusty material may also be stainless steel. Nowadays, stainless steel pipe applications are well-known. Stainless steel can also rust under certain conditions

Seamless steel pipes are perforated from whole round steel, and steel pipes without welds on the surface are called seamless steel pipes.

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Cold-drawn or cold-rolled precision seamless steel pipe (GB3639-83) is a cold-drawn or cold-rolled precision seamless steel pipe with high dimensional accuracy and good surface finish for mechanical structure and hydraulic equipment. The use of precision seamless steel pipes to manufacture mechanical structures or hydraulic equipment can greatly save machining man-hours, increase material utilization, and at the same time help improve product quality.

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