Carbon Steel Box Section Square:10*10mm-600*600mm
Rectangular:10*15mm-800*1000mm by HengHui Steel

Product details

Welded steel pipe, also known as welded pipe, is a steel pipe made of steel plate or strip steel after crimping and welding, generally 6 meters. Welded steel pipe has the advantages of simple production process, high production efficiency, variety specifications, less equipment investment, more use scenarios, long life and so on

Product introduction

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 specifications of welded steel pipes have been increasing, and they have replaced seamless steel pipes in more and more fields. Welded steel pipe is divided into straight seam welded pipe and spiral welded pipe according to the form of weld. Classification by production method: Process classification - arc welded pipe, resistance welded pipe, (high frequency, low frequency) gas welded pipe, furnace welded pipe.

Small diameter welded pipe adopts straight seam welding, large diameter welded pipe adopts spiral welding. According to the shape of the end of the steel pipe, it is divided into circular welded pipe and special-shaped (square, rectangular, etc.) welded pipe; According to different materials and uses, it is divided into welding steel pipes for mining fluid transportation, galvanized welded steel pipes for low pressure fluid transportation, and electric welded steel pipes for belt conveyor rollers. According to the specification and size table in the current national standard, the external diameter * wall thickness is sorted from small to large.

Product standard

Commonly used welded pipe materials are: Q235A, Q235C, Q235B, 16Mn, 20#, Q345, L245, L290, X42, X46, X60, X80, 0Cr13, 1Cr17, 00Cr19Ni11, 1Cr18Ni9, 0Cr18Ni11Nb, etc.

The billet used for welding steel pipe is steel plate or strip steel, which is divided into furnace welded pipe, electric welding (resistance welding) pipe and automatic arc welding pipe because of its different welding process. Because of its different welding forms are divided into straight seam welded pipe and spiral welded pipe two kinds. Because of the shape of its end, it is divided into circular welded pipes and special-shaped (square, flat, etc.) welded pipes.

Welded pipes are divided into the following varieties because of their different materials and uses:

GB/T3091-2008 (Welded steel pipe for low pressure fluid transportation) : mainly used for conveying water, gas, air, oil and heating hot water or steam and other general low pressure fluids and other purposes. Its representative material is: Q235A grade steel.

GB/T14291-2006 (Welded steel pipe for mining fluid transport) : mainly used for straight seam welded steel pipe for mining air pressure, drainage and shaft gas discharge. Its representative material Q235A, B grade steel.

Production process

The production process of straight welded pipe is simple, the production efficiency is high, the cost is low, and the development is fast. The strength of spiral welded pipe is generally higher than that of straight welded pipe, and welded pipe with larger diameter can be produced with narrower billet, and welded pipe with different diameter can also be produced with billet of the same width. However, compared with the straight seam pipe of the same length, the weld length is increased by 30 to 100%, and the production speed is lower.

The welded pipe with large diameter or thicker is generally made directly of steel billet, while the small welded pipe thin-walled welded pipe only needs to be directly welded through the steel strip. Then it is simply polished and brushed.

Products are widely used in tap water engineering, petrochemical industry, chemical industry, power industry, agricultural irrigation, urban construction, is one of the 20 key products developed in China.

For liquid transport: water supply, drainage. For gas transport: gas, steam, liquefied petroleum gas.

For structure: for piling pipe, as a bridge; Pier, road, building structure pipe, etc.

Product advantages

1. High strength hot rolled pipe has high strength and can withstand large load. This allows hot-rolled tubes to play an important role in various structural engineering and mechanical processing.

2. Corrosion-resistant hot rolled pipe has good corrosion resistance after treatment. This enables hot-rolled tubes to be used in harsh environments, such as Marine environments and the chemical industry.

3. Good machinability Hot rolled pipe has excellent machinability and can meet various machining requirements. The smooth surface and size of the hot rolled pipe make it easy to cut, weld and cold work.

4. Cost effective Hot rolled pipe has relatively low production cost and long service life. This makes hot-rolled tubes highly competitive in various industries.

5. Sustainable hot-rolled pipe is a recyclable material with less impact on the environment. Its sustainable development characteristics meet the requirements of modern society for environmental protection and sustainable development.

Hot rolled pipe has a wide range of applications and many advantages. It plays an important role in fields such as oil and gas transmission, structural engineering, machining, petrochemical industry and energy industry. Its advantages of high strength, corrosion resistance, good processing properties, cost-effective and sustainable development make it a material for various industries. With the continuous progress of science and technology, our company has been committed to technological innovation and make greater contributions to the development of human society