Q235B Steel Pipe

The commonly used standards of Q235B steel pipes are generally divided into: SY/T5037-2000 (Ministry standard, also called spiral seam submerged arc welded steel pipe for ordinary fluid transportation pipelines, GB/T9711.1-1997 (National standard, also called oil and gas industry delivery steel pipe delivery) The first part of the technical conditions: A grade steel pipe (to the strict GB/T9711.2 grade B steel pipe), API-5L (American Petroleum Institute, also called pipeline steel pipe; which is divided into two levels: PSL1 and PSL2), SY/ T5040-92 (Spiral submerged arc welded steel pipe for pile) All Carbon Steel Pipes can do Chemical Component Analysis, Mechanical Properties (Ultimate tensile strength, Yield strength, Elongation), Technical Properties (Flattening Test, Bending Test,  Hardness Test, Impact Test), Exterior Size Inspection, Hydrostatic Test, NDT TEST ( ET TEST, UT TEST), welcome to send inquire to us if any necessary.

Looking for a trusted supplier? Want a quick reply ? Contact us for free advice.

Q235B steel pipe is a steel pipe made of strip steel coils as raw materials, often extruded at temperature, and welded by automatic double-wire double-sided submerged arc welding.

Production Process
The raw materials are strip steel coils, welding wire, and flux. Strict physical and chemical tests are required before investment. The strip steel head and tail are butt jointed by single-wire or double-wire submerged arc welding, and automatic submerged arc welding is used for repair welding after coiling into steel pipe. Before forming, the strip undergoes leveling, edge trimming, edge planing, surface cleaning and conveying, and pre-bending treatment. Electric contact pressure gauges are used to control the pressure of the cylinders on both sides of the conveyor to ensure the smooth delivery of the strip. Adopt external control or internal control roll forming. The weld gap control device is used to ensure that the weld gap meets the welding requirements, and the pipe diameter, the amount of misalignment and the weld gap are strictly controlled.

Both internal welding and external welding use American Lincoln electric welding machines for single-wire or double-wire submerged arc welding, so as to obtain stable welding specifications. The welds are inspected by an online continuous ultrasonic automatic flaw instrument, which guarantees 100% non-destructive testing coverage of spiral welds. An air plasma cutting machine is used to cut the steel pipe into individual pieces. After cutting into single steel pipes, the first three steel pipes of each batch shall undergo a strict first inspection system to ensure that the pipe-making process is qualified before being officially put into production. The parts with continuous sonic flaw detection marks on the welds undergo manual ultrasonic and X-ray re-examination. The pipes where the strip butt welds and the D-shaped joints intersecting the spiral welds are all inspected by X-ray television or filming. Each steel pipe undergoes hydrostatic pressure test, and the pressure adopts radial seal. The test pressure and time are strictly controlled by the steel pipe hydraulic microcomputer detection device. The test parameters are automatically printed and recorded. The pipe end is machined to accurately control the verticality of the end surface, the bevel angle and the obtuse edge.

Q235B Steel Pipe Specifications

Production Range ·       SSAW
OD: 219mm – 3120mm
WT: 3mm – 25mm·       LSAW
OD: 16″-64″
WT: max 50mm

·       ERW
OD: 1/8″-24″
WT: max 26.5mm

·       SMLS
OD: 1/8″-36″
WT: 1.25mm – 50mm

Codes and Standards ANSI, ASME, ASTM, API, SAE, BS, AGA, AWWA, ISO, DIN
Dimensions ASME/ ANSI B36.10 / 19
Pipe schedules SCH 5, SCH10, SCH 40, SCH 80, SCH 80S, SCH 160, SCH XXS, SCH XS
Producing techniques Seamless / ERW / Welded / Fabricated / CDW / EFW
Available Shapes Round, Half Round, Square, Rectangular or Custom shape
Length 3 to Max18 Meters or custom
End Beveled End, Plain End, Treaded
Test Certificate EN 10204 3.1 B
Length Random Length / Fixed Length / SRL / DRL
Usage Mechanical Tubing Liquid Transport Steel Pipe
General structure, mechanical structure Transport liquid, gas, oil
Test ·       Chemical Component Analysis

·       Mechanical Properties (Ultimate tensile strength, Yield strength, Elongation)

·       Technical Properties (Flattening Test, Blow Test, Impact Test, Flaring Test, Bending Test, Hardness Test etc)

·       Exterior Size Inspection

·       Nondestructive Test (Ultrasonic flaw detector, Eddy current flaw detector)

·       Hydrostatic Test

Surface Fusion bond Expoxy Coating / Coal Tar Expoxy / 3PE / Varnish Coating
Bitumen Coating / Black Oil Coating as per customer’s requirement
Mill Test Certificate EN 10204/3.1B

Q235B Carbon Steel Pipe Composition

Grade Chemical Composition
C Mn Si S P
Q195 0.06-0.12 0.25-0.50 ≤0.30 ≤0.045 ≤0.05
Q215 0.09-0.15 0.25-0.55 ≤0.30 ≤0.05 ≤0.045
Q235 0.12-0.20 0.30-0.67 ≤0.30 ≤0.045 ≤0.04
Q345 ≤0.20 1.00-1.60 ≤0.55 ≤0.04 ≤0.04

Steel Grade Q195 Pipe Mechanical Properties

(N/mm2 = Mpa)

Grade Yield Strength Tensile Strength
Q195 195 315-430
Q215 215 335-450
Q235 235 370-500
Q275 275 410-540

Features
Straight seam 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 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. Therefore, most of the smaller diameter welded pipes adopt straight seam welding, and the large diameter welded pipes mostly adopt spiral welding.

Standard Classification
Spiral seam submerged arc welded steel pipe (SY5036-83) for pressure-bearing fluid transportation is mainly used for pipelines for transporting oil and natural gas; spiral seam high-frequency welded steel pipe (SY5038-83) for pressure-bearing fluid transportation, using high-frequency lap welding method Welded, spiral seam high-frequency welded steel pipe for pressure-bearing fluid transportation. The steel pipe has strong pressure-bearing capacity and good plasticity, which is convenient for welding and processing. Generally, the spiral seam submerged arc welded steel pipe (SY5037-83) for low-pressure fluid transportation is made by double-sided automatic submerged arc welding or single-sided welding for water, Submerged arc welded steel pipe for conveying general low pressure fluids such as gas, air and steam

The commonly used standards of Q235B steel pipes are generally divided into: SY/T5037-2000 (Ministry standard, also called spiral seam submerged arc welded steel pipe for ordinary fluid transportation pipelines, GB/T9711.1-1997 (National standard, also called oil and gas industry delivery steel pipe delivery) The first part of the technical conditions: A grade steel pipe (to the strict GB/T9711.2 grade B steel pipe), API-5L (American Petroleum Institute, also called pipeline steel pipe; which is divided into two levels: PSL1 and PSL2), SY/ T5040-92 (Spiral submerged arc welded steel pipe for pile)

Q235B steel pipe material: Q235A, Q23b, 0Cr13, 1Cr17, 00Cr19Ni11, 1Cr18Ni9, 0Cr18Ni11Nb. Q345 L245 L290 X42 X46 X70 X80

 

 

 

Contact us

Are you looking for a reliable supplier of stainless steel products from China? Are you afraid of being scammed by some dishonest ones? 

Wide Steel can not only supply quality ss products to worldwide customers, but also help customers investigate their supplier’s background in China.

If you need useful advice, just contact us freely.  Friendship first, business second.

Pro Service Team

Our professional service team are ready to answer any question from customers 24/7/365

Expert Engineers

The founder and the engineers have at least 10 year experiences in stainless steel industry

Top Quality Guarantee

We ship what we describled to customers, never ship low quality steel instead. We cherish our image and we want to be a company for more than 100 years.

Powerful Production Ability

We have more than 150 employees and also work with a lot of factories to fulfil our orders. We have powerful sources in China

Tell us you needs, and ...

Our sales manager will be in touch with you soon. 
You can also email to info@widesteel.com for quick reply.

Scroll to Top