SSAW Steel Pipe, Piling pipe, Spiral Welded Pipe

SSAW Steel Pipe

SSAW steel pipe is a spiral seam steel pipe made of strip steel coils as raw materials, often extruded and formed by automatic double-wire double-sided submerged arc welding. The spiral steel pipe feeds the strip steel into the welded pipe unit. After rolling by multiple rollers, the strip steel is gradually rolled up to form a round tube blank with an open gap. The reduction of the squeeze roller is adjusted to control the weld gap at 1~ 3mm, and make both ends of the welding joint flush.SSAW steel pipes are generally used for welding into pipelines for fluid transportation, metal structures, pile foundations, etc. For liquid transportation: water supply, drainage. For gas transportation: coal gas, steam, liquefied petroleum gas. For structural use: as pile pipes, bridges; docks, roads, building structure pipes, etc.

Classfication of SSAW Steel Pipe

Classfication	Standard	Main Products
Steel Pipe for Fluid Service	GB/T 14291	Welded pipe for mine fluid sevice
	GB/T 3091	Welded pipe for low pressure fluid service
	SY/T 5037	Spirally submerged arc welded steel pipe for pipelines for low pressure fluid service
	ASTM A53	Black and hot-hipped galvanized welded and seamless steel pipe
	BS EN10217-2	Welded steel tybes for pressure purposes – delivery technical conditions – part2: Electric welded non- alloy and alloy steel tubes with specified elevated temperature properties
	BS EN10217-5	Welded steel tybes for pressure purposes – delivery technical conditions – part5: submerged arc welded non-alloy and alloy steel tubes with specified elevated temperature properties
Steel Pipe for Ordinary Structure	GB/T 13793	Longitudinally electric resistance welded steel pipe
	SY/T 5040	Spirally submerged arc welded steel pipe piles
	ASTM A252	Welded and seamless steel pipe piles
	BS EN10219-1	Cold formed welded structural hollow sections of non-alloy and fine grain steels – part1: Technical delivert conditions
	BS EN10219-2	Cold formed welded structural hollow sections of non-alloy and fine grain steels – part2: tolerances dimmsions and sectional properties
Line Pipe	GB/T 9711.1	Steel pipe for pipeline transportation system of petroleum and natural gas industries(Class A steel pipe)
	GB/T 9711.2	Steel pipe for pipeline transportation system of petroleum and natural gas industries(Class B steel pipe)
	API 5L PSL1/2	Line pipe
Casing Pipe	API 5CT/ ISO 11960 PSL1	Steel pipe for use as casing or tubing for wells of petroleum and natural gas industries

Description of SSAW Steel Pipe

Keywords (pipe type): SSAW Pipe, SSAW Steel Pipe, Spiral Steel Pipe, Welded Spiral Pipe

Commodity	Spiral Welded Steel Pipe
Outer diameter	ERW / HFW	LSAW / DSAW	SSAW / HSAW	RHS	SHS
	1/8 - 20 inch (10.3 - 508 mm)	12 - 56 inch (323.8 - 1420 mm)	8 - 126 inch (219 - 3200 mm)	40 x 20 mm - 1000 x 800 mm	15 x 15 mm - 1000 × 1000 mm
Wall thickness	0.4 - 16 mm	6.0 - 40 mm	6.0 - 26 mm	1.0 - 30 mm	0.6 - 30 mm
Length	5.8 ~ 12.0 m or upon customers' requirements
Standard	GB/T 3091, GB/T 13793, ASTM A252, ASTM A53, ASTM A500, EN 10210, EN 10219, API 5L, DIN 1626/1615, DIN 17120, etc.
Grade	SS400, Q235, Q345, Q460, A572 Gr.50, A572 Gr.60, S235, S275, S355, Grade A/B, X42, X52, X60, X70, etc.
Surface	Prime quality (bared, oiled, color paint, 3LPE, or other anti-corrosive treatment)
Inspection	With Chemical Composition and Mechanical Properties Analysis; Dimensional and Visual Inspection, also with Nondestructive Inspection.
Application	structure, electric power transmission tower projects, piling, water, oil & gas pipeline engineering, mechanical industry, municipal projects, roads and its auxiliary facilities, etc.
Packing	Standard export, in bulk / bundles / nylon fabric bags with seaworthy packing; or according to customers' requestments.

SSAW Steel Pipe Production Flow Chart

Spiral welded pipe (SSAW pipe) is a kind of spiral seam steel pipe made of strip steel coil as raw material, which is welded by automatic double-wire double-sided submerged arc welding process and extruded at room temperature. Water supply engineering, petrochemical industry, chemical industry, electric power industry, agricultural irrigation and urban construction are the fields where spiral welded pipes are mainly used.

SSAW steel pipe production flow chart

Uncoiling
Levelling
Skelp end cutting
Skelp end welding
Internal & external welding
Forming
Edge Trimming
On-line ultrasonic inspection
Cutting
Preliminary control

Bevelling
Final visual and dimensional control
Radiography
Hydrostatic test
Welding repair
External / internal coating
Marking
Lashing & inland transportation
Custom’s weight bridge

Advantages of SSAW Steel Pipe

SSAW pipe (or spiral welded pipe) is formed by cold forming hot rolled coil and welding in a continuous process using submerged arc welding. It is made by rolling low carbon structural steel and low alloy steel strip into pipes according to a certain spiral angle and then welding the pipe joints. The spiral welding process is efficient, flexible, low cost, and can be customized to very large diameters or long lengths according to different grades.

Advantages of spiral welded pipe:

(1) Steel pipes of different diameters can be produced from the same width of steel pipe, which is particularly suitable for producing large diameter steel pipes from narrow strip steel.

(2) Under the same pressure conditions, the stress on the spiral weld is smaller than that on the straight seam, which is 75% to 90% of that on the straight seam welded pipe, so it can withstand greater pressure. Compared with the straight seam welded pipe of the same outer diameter, the wall thickness can be reduced by 10% to 25% under the same pressure.

(3) Accurate size, generally the diameter tolerance is not more than 0.12%, the deflection is less than 1/2000, and the ovality is less than 1%. Generally, the sizing and straightening processes can be omitted.

(4) It can produce continuously. In theory, it can produce steel pipes of unlimited length. The loss of cutting the head and tail is small, which can increase the metal utilization rate by 6% to 8%.

(5) Compared with straight seam welded pipes, it is flexible to operate and easy to change varieties.

(6) The equipment is light in weight and has low initial investment. It can be made into a trailer-type mobile unit to directly produce welded pipes at the construction site of pipeline laying.

(7) It is easy to realize mechanization and automation.

Application of SSAW Steel Pipe

Spiral welded pipe is mainly used in water conservancy projects, petrochemicals, chemicals, electricity, agricultural irrigation, urban construction and other fields. Used for liquid transportation: water supply, drainage, sewage treatment projects, mud transportation, seawater transportation. Used for gas transportation: coal gas, steam, liquefied petroleum gas. Used as structures: used as piling pipes, used as bridges; docks, roads, building structures, marine piling pipes and other pipelines.

Application of SSAW steel pipe