What are the different between SSAW and LSAW pipe? Both SSAW and LSAW pipes are large-diameter steel pipes. And made acc. to API 5L, ASTM A252 and etc. So let’s see what’s the differences between LSAW and SSAW from 6 aspects.
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All we know, LSAW pipes use 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 characteristic. Such as ductility, weld toughness, uniformity, plasticity, and great sealing. Meanwhile, producing process of SSAW steel pipe’s 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.
Outside diameter of LSAW pipe ranging from 16 inches (406.4 mm) to 60 inches (.0 mm). And wall thickness from 6.0 mm to 30.0 mm. Good performances on high-pressure resistance, and low-temperature corrosion resistance.
While SSAW steel pipe diameter range is from 8 inches (219.1 mm) to 120 inches (.0 mm); Wall thickness from 5.0 mm to 25.0 mm. The advantage part is we can get the different diameter of SSAW pipes with the same size as the steel strip. There is a wide application for the raw material steel strip.
SSAW pipe weld seam should avoid primary stress, and good performances to bear the stress. The disadvantage is the bad physical dimension. Welding seam length is longer than the pipe length. It is easy to cause the defects of cracks. Like air hole, cinder inclusion, partial welding, welding force in pulling status. Thought SSAW pipe is using welding technology of Submerged Arc-Welding. It is same with LSAW steel pipes. The SSAW pipe is spiral welded where the LSAW is straight welded.
Application of LSAW steel pipes used in the oil and gas pipelines. Especially required large diameter and thick wall pipe with high strength and long-distance. Meanwhile, it needed in construction of a structure that needs tough strengthl. In the water treatment, thermal industry, bridge building, and etc.
According to API specifications, the LSAW pipe designated in many areas. Such as, large-scaled oil and gas transportation. In the cases that pipeline across the city, sea, and the urban area.
As we know, SSAW pipes used for oil and gas pipeline systems. But in petroleum design specification, the SSAW could only applied in many areas. Such as construction structure, water transport and sewage treatment, thermal industry, building, etc.
Finally, different use of the raw material, the price of LSAW is higher than the SSAW steel pipe. But the LSAW has better performance than the SSAW steel pipe. For common used steel grade, the MOQ for the LSAW pipe has no limitation while SSAW is about 30 ~ 50 tons per size.
The scope of ASTM A106 and A53
ASTM A53 specifications cover seamless and welded steel pipe manufacturing types, and the materials are carbon steel and black steel. Surface natural, black, and hot-dipped galvanized, zinc coated steel pipe. Diameters range from NPS 1⁄8 to NPS 26 (10.3mm to 660mm), nominal wall thickness.
ASTM A106 standard specification covers seamless carbon steel pipe requiring the high-temperature service.
For ASTM A53 there are ERW and seamless steel pipes Type F, E, S covers Grade A and B.
A53 Type F, furnace butt welded, continuous weld Grade A
A53 Type E, Electric resistance welded (ERW), in Grade A and Grade B.
A53 Type S, Seamless steel pipe, in Grade A and Grade B.
ASTM A53 Grade B chemical properties content C≤0.30%, Mn≤1.2%, P≤0.05%, S≤0.045%, Cr≤0.40, Cu≤0.40, Ni≤0.40, Mo≤0.40, V≤0.08.
ASTM A53 B mechanical strength is the same with ASTM A106 B steel pipe, Tensile strength maximum 415 Mpa, Yield strength maximum 240 Mpa.
Elongation: For A53 pipe there are 2 methods to calculate elongation.
A: Use equation: e = 625 000 [] A^0.2/U^0.9
B: See ASTM A53 elongation value table X4.1 or table X4.2 for different specimen area.
For ASTM A106 steel pipe, manufacturing Type only in seamless, processes hot rolled and the cold drawn. Grade in A, B and C
ASTM A106 Grade A: Maximum Carbon element 0.25%, Mn 0.27-0.93%. Minimum tensile strength Psi or 330 Mpa, yield strength Psi or 205 Mpa.
A106 Grade B: Maximum C below 0.30%, Mn 0.29-1.06%. Minimum tensile strength Psi or 415 Mpa, yield strength Psi or 240 Mpa.
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Grade C: Maximum C 0.35%, Mn 0.29-1.06%. Minimum tensile strength Psi or 485 Mpa, yield strength Psi or 275 Mpa.
Mechanical Properties
Tensile Strength:
A53 Grade B: Minimum 60,000 psi (415 MPa)
A106 Grade B: Minimum 60,000 psi (415 MPa)
Yield Strength:
A53 Grade B: Minimum 35,000 psi (240 MPa)
A106 Grade B: Minimum 35,000 psi (240 MPa)
Both grades have similar mechanical properties, but A106 is often used in applications where more stringent quality and performance are required.
Application and Usage
A53 Grade B:
Generally used for low to medium pressure applications, such as water pipes, air pipes, steam, and structural applications.
Common in general construction, mechanical, and plumbing applications.
A106 Grade B:
Used in high-temperature services and high-pressure systems, particularly where seamless piping is preferred.
Common in oil refineries, gas plants, and power generation plants.
Pressure and Temperature:
A53 Grade B:
Typically used in applications with lower pressure and temperature requirements.
A106 Grade B:
Suitable for higher pressure and temperature applications, often used in environments where pipes are exposed to elevated temperatures and pressures.
Summary
A53 Grade B is more commonly used for general piping, construction, and low-pressure applications. It can be either seamless or welded.
A106 Grade B is specifically designed for high-temperature and high-pressure applications and is always seamless, making it more suitable for demanding environments.
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