Q235B SMLS 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.

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Seamless steel pipes are widely used. General-purpose seamless steel pipes are rolled from ordinary carbon structural steel, low-alloy structural steel or alloy structural steel, and have the largest output. They are mainly used as pipelines or structural parts for conveying fluids.
According to different purposes, it can be supplied in three categories:
a. Supply according to chemical composition and mechanical properties;
b. According to mechanical performance;
c. According to the water pressure test supply. The steel pipes supplied according to category a and b shall be subjected to hydraulic test if they are used to withstand liquid pressure.
Special-purpose seamless pipes include seamless pipes for boilers, chemical and electric power, seamless steel pipes for geology, and seamless pipes for petroleum.
Seamless steel pipes have a hollow section and are used in large quantities as pipelines for conveying fluids, such as pipelines for conveying oil, natural gas, gas, water and certain solid materials. Compared with solid steel such as round steel, steel pipe is lighter in flexural and torsional strength, and is a kind of economical section steel.
Widely used in the manufacture of structural parts and mechanical parts, such as automobile transmission shafts, bicycle frames and steel scaffolds used in construction, to make ring parts with steel pipes, which can improve material utilization, simplify manufacturing procedures, and save materials and processing man-hours. Made of steel pipes.

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 StandardsANSI, ASME, ASTM, API, SAE, BS, AGA, AWWA, ISO, DIN
DimensionsASME/ ANSI B36.10 / 19
Pipe schedulesSCH 5, SCH10, SCH 40, SCH 80, SCH 80S, SCH 160, SCH XXS, SCH XS
Producing techniquesSeamless / ERW / Welded / Fabricated / CDW / EFW
Available ShapesRound, Half Round, Square, Rectangular or Custom shape
Length3 to Max18 Meters or custom
EndBeveled End, Plain End, Treaded
Test CertificateEN 10204 3.1 B
LengthRandom Length / Fixed Length / SRL / DRL
UsageMechanical 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

SurfaceFusion bond Expoxy Coating / Coal Tar Expoxy / 3PE / Varnish Coating
Bitumen Coating / Black Oil Coating as per customer’s requirement
Mill Test CertificateEN 10204/3.1B

Q235B Carbon Steel Pipe Composition

GradeChemical Composition
CMnSiSP
Q1950.06-0.120.25-0.50≤0.30≤0.045≤0.05
Q2150.09-0.150.25-0.55≤0.30≤0.05≤0.045
Q2350.12-0.200.30-0.67≤0.30≤0.045≤0.04
Q345≤0.201.00-1.60≤0.55≤0.04≤0.04

Steel Grade Q195 Pipe Mechanical Properties

(N/mm2 = Mpa)

GradeYield StrengthTensile Strength
Q195195315-430
Q215215335-450
Q235235370-500
Q275275410-540

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

 

 

 

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