SAW pipes

Submerged arc welding (SAW) is a common arc welding process. SAW is normally operated in the automatic or mechanized mode, however, semi-automatic (hand-held) SAW guns with pressurized or gravity flux feed delivery are available.

• Spiral Submerged-arc Welded Quality Assurance
• ASTM A252 SSAW pipes
• ASTM A252-89 Weldedd and seamless pipe piles
• Spiral Submerged-arc Welded steel pipe Success Stories

The process is normally limited to the flat or horizontal-fillet welding positions (although horizontal groove position welds have been done with a special arrangement to support the flux).

SAW pipe is made of hot rolled coiled steel by automatic submerged arc weld under normal atmospheric temperature. All the pipes are produced according to API Spec 5L, GB/T9711.1, GB/T9711.2, ASTM A252-89 standard. These pipes mainly used in petroleum and natural gas industry to transport flammable and non-flammable liquid and steel construction.

Size:

• (O.D×Wall Thickness)mm×Length(mm)
• 219-3200mm×5-30mm x 12000mm+500mm
• In addition to above specification, the pipes can be produced according to customer’s requirements.

Execute Standard:

• ASTM A252-89 WELDE AND SEAMLESS STEEL PIPE PILES  
• API SPEC 5L Specification for Line Pipe
• GB/T9711.1 Petroleum and natural gas industries—Steel pipe for pipelines—Technical delivery conditions
• SY/T5037 Spiral submerged arc welded pipe for low pressure liquid transportation

Material:

Q235-Q345,　L175-L485,　SS400,　16Mn,　L290-L360

or according to the customer's requirements.

Mainly usage:

Spiral welded steel pipes are widely used in Oil, Natural Gas, Water and other flammable & nonflammable liquid conveyance and distribution pipelines, steel structures for construction and other general purposes by means of their wide size range.

• Pipe Coating: HDPE/ 3PE/ 3PP/ Pipe cement mortar lining
• Mill Test Certificate: EN 10204/3.1B 
• Third party inspection: SGS, BV, Lloyds etc.

Spiral Submerged-arc Welded Quality Assurance

Excellent Equipment:

There are nine modernized product lines in our company with the yield capacity of 1000 thousands tons of B-X80 steel pipe of φ219-φ3200mm, WT5-30mm.

Ultrasonic Inspecting SSAW pipe mills High Frequency Welding Normalizing

Lincoln Welder Welding Supercoil Accumulator Forming Machine Airport

Welding of hot rolled steel coils takes spiral form after passing through preforming and forming rolls. Excellent exterior weld quality at high production speeds is provided by double submerged arc welding process. Manufactured pipes are cut to the desired lengths at the exit of the pipe machine. Pipe ends are beveled by means of carbide machining for accurate on-site welding. 

After the pipe is conveyed to hydrostatic testing and off-line ultrasonic testing and/or real time X-ray inspection, the pipe will be subject to final inspection for the compliance to customer requirements. 

Starting from incoming control up to the final inspection stage; entire process is monitored and supported by computerized system. Traceability is achieved by input controls and barcodes through entire production lines.

Steel Square Tubing

Our Steel Square Tubing are used in mechanical engineering and steel construction, even for demanding applications.

Steel square tubing is some of the most versatile and useful pieces of metal products around. Made from high quality steel, its sturdy construction gives it long-lasting strength. The unique hollow-body structure of steel square tubing give it an added layer of sturdiness, as well as make it significantly lighter than a solid steel bar. Here at Sunny Steel we recognize the usefulness and versatility of steel square tubing, and that’s why we have a huge selection in plenty of different sizes.

Steel tube is easily recyclable. Many projects take advantage of square steel tubing, including all types of buildings, highway guardrails and signage, support columns, trusses, bridges, heavy equipment, storage systems, and exercise equipment.

A wide range of dimensions, when combined with the appropriate steel grade, ensure that the functionality and cost-efficiency of your structure can be optimised.

Tolerances:

Length	+/- 50 MM
Wall Thickness	+/- 12.5%
Weight	+/- 8%

Mill Test Certificate: EN 10204/3.1B 
Third party inspection: SGS, BV, Lloyds etc.

Note: Pre-galvanized square / rectangular hollow section with OD 19mm-70mm and thickness 1mm-2.3mm are also available. 
Application:
Furniture industries & domestic applications, bus body, fencing etc. Sizes other than mentioned above can also be produced upon specific requirements.