SSAW Steel 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.

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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.