High Quality Welded Pipe - Longitudinal Welded Pipe – JINBAICHENG

Product Introduction

Place of Origin: Hebei, China
Type: welded pipe,
Application: high temperature resistance
Grade: high temperature alloy
Ni (Min): 50%
Powder or not: non-powder
Ultimate strength (≥ MPa): 965 extension

Elongation rate (≥ %): 30
Brand: Jinbaicheng
Melting point: 1390 degrees Celsius
Maximum temperature: 1260~1340℃
Surface: bright, oxidized or pickled
Size: custom size
Heat treatment method: solution aging treatment

Product Display

Practical Overview

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 been increasing. Seam the steel pipe. Welded steel pipes are divided into straight seam welded pipes and spiral welded pipes according to the form of welds. Classification by production method: process classification-arc welded pipe, resistance welded pipe, (high frequency, low frequency) gas welded pipe, furnace welded pipe.

Smaller diameter welded pipes are welded by straight seam, while large diameter welded pipes are mostly spiral welded. According to the shape of the end of the steel pipe, it is divided into round welded pipe and special-shaped (square, rectangular, etc.) welded pipe; according to different materials and uses, it is divided into mining fluid Conveying welded steel pipes, galvanized welded steel pipes for low-pressure fluid conveying, electric welded steel pipes for belt conveyor rollers, etc. According to the size table in the current national standard, sort by outer diameter * wall thickness from small to large.

Product Standards

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 plates or strip steels, which are divided into furnace welded pipes, electric welded (resistance welded) pipes and automatic arc welded pipes due to their different welding processes. Because of its different welding forms, it can be divided into two types:

straight seam welded pipe and spiral welded pipe. Because of its end shape, it is divided into round welded pipe and special-shaped (square, flat, etc.) welded pipe. 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 to transport water, gas, air, oil, heating water or steam and other generally lower 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 pipes for mine air pressure, drainage, and shaft discharge gas. Its representative material is Q235A, Grade B steel.

GB/T12770-2002 (Stainless steel welded steel pipe for mechanical structure): Mainly used for machinery, automobiles, bicycles, furniture, hotel and restaurant decoration 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 transportation): Mainly used to transport low-pressure corrosive media. 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).

Production Process

Longitudinal welded pipe has simple production process, high production efficiency, low cost and rapid development. The strength of spiral welded pipes is generally higher than that of straight seam welded pipes. A narrower blank can be used to produce welded pipes with larger pipe diameters, and a billet with the same width can also be used to produce welded pipes with different pipe diameters. But compared with the straight seam pipe of the same length, the weld length is increased by 30-100%, and the production speed is lower.

Large diameter or thick welded pipes are generally made directly from steel blanks, while small welded pipes and thin-wall welded pipes only need to be welded directly through steel strips. Then after a simple polishing, drawing is fine.
Supplement: The welded pipe is welded with strip steel, so it is not as high as a seamless pipe.

Scope of application

Products are widely used in water supply engineering, petrochemical industry, chemical industry, power industry, agricultural irrigation, and urban construction. It is one of the 20 key products developed in my country.

Used for liquid transportation: water supply and drainage. Used for gas transportation: coal gas, steam, liquefied petroleum gas.

For structural purposes: as piling pipes and bridges; pipes for docks, roads, and building structures. 

Product Description