Longitudinally Submerged Arc Welded Steel pipes

LSAW (Longitudinally Submerged Arc Welded Steel pipes) in leaflets plate as raw material, the steel plate in the mold or molding machine pressure (volume) into using double-sided submerged arc welding and flaring from production.

Q345B steel polishing method

Polishing means a processing method by the action of mechanical, chemical or electrochemical, lower the q345b steel pipe surface roughness, to obtain a bright and smooth surface, and surface modification process making use of a flexible polishing tools and polishing abrasive particles or other media on the workpiece.

Q345B steel polishing method often used Polishing means a processing method by the action of mechanical, chemical or electrochemical, lower the q345b steel pipe surface roughness, to obtain a bright and smooth surface, and surface modification process making use of a flexible polishing tools and polishing abrasive particles or other media on the workpiece.

Polishing can not improve the dimensional accuracy or geometrical shape accuracy of q345b steel pipe, but can obtain a smooth surface or specular gloss, sometimes to be used to eliminate gloss. Usually buff as a polishing tool. Buff is generally made with multilayer canvas, leather crafted stacked, on both sides clamped with a metal circular plate, its rim coated abrasive mixture of powder and oil and other uniform.

(1) Mechanical q345b steel polishing surface corrosion resistance. As we know, the mechanical polishing q345b steel corrosion resistance is significantly lower than the electrochemical polishing q345b steel pipe, mainly due to the cold mechanical q345b polishing surface hardened steel deformed layer high corrosion rate, coupled with in the mechanical polishing process, inevitably have abrasive particles embedded in the deformable layer, the corrosion rate of deformation layer increased greatly.

(2) electrochemical q345b steel polishing makes the metal surface hardening layer easy to be dissolved, and can lower the surface activity, what’s more, there is a continuous passivation film formed on the surface, significantly improved the corrosion resistance.

The developing trend of lsaw steel pipe

Mechanical Properties of Chinese low alloy steel: Q345B

Q345B steel is a Chinese standardized low alloy, medium tensile strength steel made with a hot-rolling process, and is used for a number of manufacturing purposes. It is a steel with less than 0.2 percent of its composition made up of carbon, less than 0.55 percent of its composition made of silicon and several impurities (mostly sulfur, chromium and nickel). This particular grade of steel is a 'general purpose' manufacturing steel in construction equipment field, such as Q345B is basic mateiral of making excavator bucket and long boom arms.

Mechnical property for Q345B low alloy structural steel:
Tensile strength yield strength

1, Yield Strength

A yield strength or yield point is the material property defined as the stress at which a material begins to deform plastically. Prior to the yield point the material will deform elastically and will return to its original shape when the applied stress is removed, Yield strength of Q345B is 345 MegaPascals. Like most steels of its grade, it suffers elongation before it pulls apart, typically at 20-21 percent of its initial length.

2, Tensile strength

The tensile strength of a material is the maximum amount of tensile stress that it can take before failure, for example breaking. Steel tensile strength is expressed in units of force divided by cross sectional area; in the Metric system, this unit is known as the Pascal. One Pascal is a Newton (the force needed to accelerate a one kilogram object to a velocity of one meter per second) per square meter. The tensile strength of Q345B steel is rated at 470 to 660 MegaPascals (where mega is million).

Thickness (mm)
Q345B ≤ 16 > 16 ≤ 35 > 35 ≤ 50 >50
Yield strength (≥Mpa) 345 325 295 275
Tensile strength (Mpa) 470-630

Steel tensile strength is expressed in units of force divided by cross sectional area; in the Metric system, this unit is known as the Pascal. One Pascal is a Newton (the force needed to accelerate a one kilogram object to a velocity of one meter per second) per square meter. The tensile strength of Q345B steel is rated at 470 to 630 MegaPascals (where mega is million) and a yield strength (where the material starts to thin and pull like taffy) at 345 MegaPascals. Like most steels of its grade, it suffers elongation before it pulls apart, typically at 20-21 percent of its initial length.

Chemical composition for Q345B low alloy structural steel (Heat Analysis Max%)
Main chemical elements composition of Q345B
C Si Mn P S V Nb Ti
0.20 0.55 1.00-1.60 0.040 0.040 0.02-0.15 0.015-0.060 0.02-0.20

The equivalent steel grade with Q345B are EN 10025-2 S355JR,ASTM A572/A572 A572 Grade 50 and DIN 17100 St52-3.

Worldwide equivalents of grade Q345B:

The density of Q345B steel is approximately 7.8 (where water is 1.0), and it is commonly available in thicknesses ranging from 2 mm to 12.7 mm (12.7 mm is approximately half-inch thick plates), with sheets typically sold in 1 to 1.35 meter wide splits.

EU 
EN
USA
-
Germany
DIN,WNr
Japan
JIS
France
AFNOR
England
BS
Canada
HG
European old
EN
Italy
UNI
Belgium
NBN
Spain
UNE
China
GB
Sweden
SS
Inter
ISO
Portugal
NP
India
IS
S355JR (1.0045)
A572
A678Gr.A
SSGrade50
St52-3
SM490A
SS490
E36-2
50B
350W
350WT
Fe510B
Fe510B
AE355B
AE355B
Q345B
Q345C
2132-01
E355C
Fe510B
FE510-B
IS961

The major benefit of this grade of steel is its mild temper. It's easy to form and easy to weld.

LSAW pipes are mainly used as long distance transportation pipeline for oil, gas, liquid coal etc. on land and offshore.
And also can be applied as construction pipes on offshore platform, power station, petrochemistry and city construction etc.

LSAW pipes Production Range

LSAW (Longitudinally Submerged Arc Welded Steel pipes) in leaflets plate as raw material, the steel plate in the mold or molding machine pressure (volume) into using double-sided submerged arc welding and flaring from production.
Range of LSAW pipes for oil and gas pipeline
Range of LSAW pipes for oil and gas pipeline
Range of LSAW pipes applied in construction

Range of roller pipes:

Range of LSAW pipes applied in construction

Note: The specification in the table is available to Q345.

Remarks:non-standard dimensions pipes can be produced to customer specifications.

Range of Roller Pipes
Number Technical parameter

Unit

HQW11s-120X3200

1 Material yield limited Mpa 245 345 345
2 Wall thickness mm 120 100 110
3 Maximum pre-bending thickness mm 110 90 100
4 Maximum width of steel plate mm 3200 3200 3200
5 Minimum diameter of fully loaded rolling steel plate mm 2500 1600 1600

Range of roller pipes:

The developing trend of LSAW steel pipe

LSAW pipes
The developing trend of LSAW steel pipe in the future:
Application of LSAW pipe

Base on its advantage of high reliability and safety performance, the LSAW pipe is widely used in various pipelines engineering and construction, even under the most severe condition, and also can be used in engineering of chemical industry, electric power, irrigation, construction and piling etc.

Technical support for LSAW pipes

Longitudinally Submerged Arc Welded Process Flow
(LSAW Pipes)with JCOE forming mode

Base on its advantage of high reliability and safety performance, the LSAW pipe is widely used in various pipelines engineering and construction, even under the most severe condition, and also can be used in engineering of chemical industry, electric power, irrigation, construction and piling etc.

LSAW Flow
LSAW Flow
LSAW Flow
LSAW Flow
Our technical support for ERW , SSAW & LSAW stel pipe

Mainly as a field gathering pipe and internal high-pressure natural gas pipeline of small-caliber, long-distance pipelines for oil and gas a small number, the vast majority of long-distance pipeline is the use of high-frequency straight seam welded pipe (ERW), spiral submerged arc welded pipe (SSAW), LSAW steel pipe (LSAW) three.

Inspection & Test Plan for LSAW

LSAW (Inspection & Test Plan for LSAW) in leaflets plate as raw material, the steel plate in the mold or molding machine pressure (volume) into using double-sided submerged arc welding and flaring from production.

The purpose of cold expansion for lsaw steel pipe

After cold expansion for lsaw steel pipe, steel tube and pipe end diameter will increase by about one percent difference in diameter of the diameter, roundness, and the pipe ends are greatly improved, also have greatly improved the straightness of the steel pipe, steel pipea length of about 0.5% reduction in wall thickness decreases by about 0.8%.

Q345B steel polishing method

Polishing means a processing method by the action of mechanical, chemical or electrochemical, lower the q345b steel pipe surface roughness, to obtain a bright and smooth surface, and surface modification process making use of a flexible polishing tools and polishing abrasive particles or other media on the workpiece .

The LSAW steel pipe producing equipments

The major equipment such as Plate Edge Milling Machine, Plate Edge Crimping Machine, Pipe Forming Press, Tack Welding Machine and Pipe Expander all adopt the technology and equipment of SMS MEER. The SMS MEER is the most famous special manufacturer to design and manufacture the whole production line equipment for LSAW pipe in the world . They have supplied all kinds of steel pipe manufacturing equipment for plenty of LSAW pipe manufacturers in the world and have got a very good reputation in this field.

LSAW produce Technology Center

As a superior technology center has been establish ed including the domestic first-class chenical laboratory,mechanics laboratory, the metallography test laboratory and welding laboratory with advanced equipments for inspection and test Accordingly,it can provide a comprehensive inspection for the raw material and the finished products so that it guaran test the high quality of products.



Weled steel pipe specification, Standard and identification

Welded steel pipe (steel pipe manufactured with a weld) is a tubular product made out of flat plates, known as skelp, that are formed, bent and prepared for welding.

Galvanized pipe process characteristics

What is Galvanized Steel Pipe? Galvanized steel can be made into a strong plumbing or tubing material -- one that resists corrosion from exposure to water or the elements. It has been used used for water-supply pipes or as a strong tubing for outdoor applications.

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