Q550E SPCC Galvanized Steel Pipe 12m Q550D Z30 Structure Tube

Factory Price China Steel Welded Pipe High Quality Seamless Carbon Steel Pipe

Certificate:API, JIS, GS

Grade:1020 1045

Surface Treatment:painting

Tolerance:±15%, ±20%

Processing Service:Welding, Punching, Cutting

Oiled or Non-oiled:Non-oiled

Invoicing:by actual weight

Delivery Time:22-30 days

Product introduction: Since the 1930s, with the rapid development of continuous rolling production of high-quality strip steel and the advancement of welding and inspection technology, the quality of welds has been continuously improved, the varieties and specifications of welded steel pipes have been increasing, and more and more fields. Instead of seamless steel pipes. Welded steel pipes are divided into straight seam welded pipes and spiral welded pipes according to the form of the weld. Classification by production method: process classification - arc welded pipe, electric resistance welded pipe, (high frequency, low frequency) gas welded pipe, furnace welded pipe.

Commonly used materials for welded pipes are: Q235A, Q235C, Q235B, 16Mn, 20#, Q345, L245, L290, X42, X46, X60, X80, 0Cr13, 1Cr17, 00Cr19Ni11, 1Cr18Ni9, 0Cr18Ni11Nb, etc.
The blanks used for welded steel pipes are steel sheets or strips, which are divided into furnace welded pipes, electric welded (resistance welded) pipes and automatic arc welded pipes due to their different welding processes. Due to the different welding forms, it is divided into two types: straight seam welded pipe and spiral welded pipe. Because of its end shape, it is divided into circular welded pipe and special-shaped (square, flat, etc.) welded pipe.

Features
The production process of straight seam welded pipe is simple, the production efficiency is high, the cost is low, and the development is fast. The strength of the spiral welded pipe is generally higher than that of the straight seam welded pipe. However, compared with the same length of straight seam pipe, the length of the weld is increased by 30~100%, and the production speed is lower.

Scope of application
The products are widely used in tap water engineering, petrochemical industry, chemical industry, electric power industry, agricultural irrigation, urban construction, and are one of the 20 key products developed in my country.

For liquid transportation: water supply, drainage. For gas transportation: gas, steam, liquefied petroleum gas.
For structure: for piling pipe, for bridge; for wharf, road, building structure, etc.

Welded pipes are divided into the following varieties due to their different materials and uses:
GB/T3091-2008 (Welded steel pipes for low-pressure fluid transportation): mainly used for conveying general low-pressure fluids such as water, gas, air, oil and heating water or steam and other purpose pipes. Its representative material is: Q235A grade steel.
GB/T14291-2006 (Welded Steel Pipe for Mine Fluid Conveying): Mainly used for straight seam welded steel pipe for mine air pressure, drainage and shaft discharge gas. It represents the material Q235A, B grade steel.
GB/T12770-2002 (stainless steel welded steel pipe for mechanical structure): mainly used for machinery, automobiles, bicycles, furniture, decoration of hotels and restaurants, and other mechanical parts and structural parts. Its representative materials are 0Cr13, 1Cr17, 00Cr19Ni11, 1Cr18Ni9, 0Cr18Ni11Nb, etc.
GB/T12771-1991 (stainless steel welded steel pipe for fluid conveying): mainly used for conveying low pressure corrosive medium. The representative materials are 0Cr13, 0Cr19Ni9, 00Cr19Ni11, 00Cr17, 0Cr18Ni11Nb, 0017Cr17Ni14Mo2, etc.
In addition, welded stainless steel pipes for decoration (GB/T 18705-2002), stainless steel welded pipes for architectural decoration (JG/T 3030-1995), and welded steel pipes for heat exchangers (YB4103-2000).