Export
Carbon Steel Pipe,
China Steel Pipe,
Low Carbon Steel Pipe,
welded pipes, from China. Our company specializes in the export of welded steel pipes and seamless steel pipes. Thousands of tons of welded steel pipes are exported every year. Welded pipes that are often exported are divided into LSAW and SSAW. Do you know the differences between LSAW Pipe and SSAW Pipe?
LSAW Pipe (Longitudinal Submerged Arc-Welding Pipe), also called SAWL pipe. It is taking the steel plate as raw material, mold it by the molding machine, then do double-sided submerged arc welding. Through this process the LSAW steel pipe will get excellent ductility, weld toughness, uniformity, plasticity and great sealing.
The LSAW pipe diameter range is larger than ERW, normally from 16 inch to 60 inch, 406mm to 1500mm. Good performances on high pressure resistance, and low-temperature corrosion resistance.
It has been widely applied in the oil and gas pipelines, specially required large diameter and thick wall pipe with high strength and long distance. Meanwhile in construction of structure that need tough strength, water treatment, thermal industry, bridge building, etc. According API specifications, the LSAW pipe (SAWL pipe or JCOE pipe) is specially designated in large scaled oil and gas transportation, in the cases that pipelines across the city, sea, and the urban area. These are the class 1 and class 2 areas.
SSAW Pipe (Spiral Submerged Arc-Welding Pipe), also called HSAW pipe (Helical SAW), welding line shape like a helix. It is using the same welding technology of Submerged Arc-Welding with LSAW pipe. Differently SSAW pipe is spiral welded where the LSAW is longitudinally welded. Manufacturing process is rolling the steel strip, to make the rolling direction have an angle with the direction of the pipe center, forming and welding, so the welding seam is in a spiral line.
The SSAW pipe diameter range is from 20 inch to 100 inch, 406 mm to 2540 mm.The advantage part is we can get the different diameter of SSAW pipes with the same size of the steel strip, there is a wide application for the raw material steel strip, and welding seam should avoid the primary stress, good performances to bear the stress.
The disadvantage is the bad physical dimension, welding seam length is longer than the pipe length, easy to cause the defects of cracks, air hole, cinder inclusion, partial welding, welding force in pulling status.
For oil and gas pipeline systems, but in petroleum design specification, the SSAW pipe / HSAW pipe could only be applied in class 3 and class 4 areas. Construction structure, water transport and sewage treatment, thermal industry, buildings etc.
Overview
Application
It Is Mainly Used for force and pressure parts, and for general purpose steam, water, gas and air pipes.
Main Grade
GR.A, GR.B
Chemical Component
|
Grade
|
Component %，≤ |
| C |
Mn |
P |
S |
CuA
|
NiA
|
CrA
|
MoA |
VA |
| S type（seamless pipe） |
| GR.A |
0.25B |
0.95 |
0.05 |
0.045 |
0.40
|
0.40
|
0.40
|
0.15 |
0.08 |
| GR.B |
0.30C |
1.20 |
0.05 |
0.045 |
0.40
|
0.40
|
0.40
|
0.15 |
0.08 |
| E type（Resistance welded pipe） |
| GR.A |
0.25B |
0.95 |
0.05 |
0.045 |
0.40
|
0.40
|
0.40
|
0.15 |
0.08 |
| GR.B |
0.30C |
1.20 |
0.05 |
0.045 |
0.40
|
0.40
|
0.40
|
0.15 |
0.08 |
| F type（Furnace Welded Pipe） |
| A |
0.30B |
1.20 |
0.05 |
0.045 |
0.40
|
0.40
|
0.40
|
0.15 |
0.08 |
A The sum of these five elements must not be greater than 1.00%。
B For every 0.01% decrease in the maximum carbon content, the maximum manganese content is allowed to increase by 0.06%, but the maximum cannot exceed 1.35%.
C Each 0.01% decrease in the maximum carbon content will allow the maximum manganese content to increase by 0.06%, but the maximum must not exceed 1.65%.
Mechanical Property
| item |
GR.A |
GR.B |
|
tensile strength, ≥, psi [MPa]
Yield Strength, ≥, psi [MPa]
Gauge 2in.or 50mm elongation
|
48 000 [330]30 000 [205]A,B |
60 000 [415]35 000 [240]A,B |
A The minimum elongation of gauge length 2in. (50mm) shall be determined by the following formula：
e=625000(1940)A0.2/U0.9
e = the minimum elongation of the gauge 2in. (50mm), the percentage rounded to the nearest 0.5%;
A = Calculated according to the specified outer diameter of the nominal tube or the nominal width of the tensile sample and its specified wall thickness, and rounded to the nearest cross-sectional area of the tensile sample of 0.01 in.2 (1 mm2), and It is compared with 0.75in.2 (500mm2), whichever is smaller.
U = specified minimum tensile strength, psi (MPa).
B For various combinations of different sizes of tensile test specimens and prescribed minimum tensile strength, the required minimum elongation is shown in Table X4.1 or Table X4.2, according to its applicability.
Test Requirement
Tensile test, bending test, hydrostatic test, nondestructive electrical test of welds.
Supply Ability
Supply Ability: 2000 Tons Per Month Per Grade Of ASTM A53/A53M-2012 Steel Pipe
Packaging
In Bundles And In Strong Wooden Box
Delivery
7-14 days if in stock, 30-45 days to produce
Payment
30% depsoit, 70% L/C or B/L copy or 100% L/C at sight
Product Detail
Boiler Tube