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.

JCOE pipes

The mill adopts continuous axis contorting J-C-O(J-ing, C-ing and O-ing)process with characteristics of high forming accuracy and efficiency as well as balanced distribution of forming stress.

JCOE manufacturing technology is developed in the 1990s as a pipe forming process, the process of molding process is the first major steel mill edge (or planing) after pre-bending by longitudinal side, and then type → J-→ C O-order molding, stamping each step are the basic principles of three-point bending. Because it is a progressive multi-pass pressing, it must address the following questions: how to determine the die shape, the upper die and lower die stroke distance, and how much press pass in order to ensure the most appropriate bend radius and the best opening round hair tube.

But these issues with the steel plate, steel plants of different mechanical properties of concrete, pipe size (diameter and wall thickness), which in turn is very complex. Currently mainly by "trial and error", that is, whenever replacement or new steel specifications, we take a certain number of sample pressure test, worked out the right amount of punch. Trial and error method is more reliable, but the efficiency is relatively low.

Specifications 

• Throughput: 300,000 MT
• Outside Diameter :Φ406-Φ1829mm (16"-72")
• Wall Thickness :6.0-25.4mm (1/4"-1")
• Ouality Standards :API, BS, ASTM , JIS, DIN, GB , ISO, DNV
• Length :3-12.2m (10'-40')
• Grades :GB/T9711 L190-L555(API 5L A-X80)

JCOE Pipe Manufacturing Process

This is the first large diameter longitudinal submerged arc welded (LSAW) pipe production line in China .The mill adopts continuous axis contorting J-C-O(J-ing, C-ing and O-ing)process with characteristics of high forming accuracy and efficiency as well as balanced distribution of forming stress. The mill has the advantages of wide specifications and can produce pipes in any size within its production range.

We are able to provide customers with quality products and perfect service.
If you want to know more information, please kind to visit our website. 

LSAW steel pipe

LSAW (Longitudinally Submerged Arc Welded Steel pipes) in leaflets plate as raw material, the steel plate in the mold or molding machine pressure (volume) into using double-sided submerged arc welding and flaring from production.

LSAW Steel Pipe For Oil & Gas pipeline
Material: As per API 5L, the steel grade covers X80 and lower,
Size Range:

• Dimension: Outer diameter: Ф406-1524mm
• Wall thickness: 6-40mm
• Unit length: 8-12.1m

LSAW Steel Pipe For Construction

• Size range: Outer diameter: Ф350-1600mm
• Wall thickness: 6-60mm
• Unit length: 6-12m

Roller Pipe

• Size range: Outer diameter: Ф1200-3800mm
• Wall thickness: 12-120mm
• Unit length (max) 3.2m

Thick Walled Large Diameter LSAW Pipe

Our mills has introduced advanced U.S. Lincoln automatic welding devices, and the international production of West German high-end quality JCOE molding technology, professional production of large diameter thick wall straight seam double submerged arc welding production line 4, the advanced German steel production equipment, with high technology, advanced technology and so on, straight seam steel several participating countries and the fluid transmission of major structural engineering projects, the company has become the designated use of structural steel enterprises, low pressure fluid supply pipe unit.

Size: OD :351-1050mm, thickness :8-30mm

material: 20 #, 16Mn, Q235B, Q345B, X42, X52, alloy steel, stainless steel.

Longitudinally Submerged Arc Welded carbon steel pipes
(LSAW Pipes)with JCOE forming mode

Roller Pipes Process Flow

Range of roller pipes: Outer diameter: Ф1200-3800mm  |  Wall thickness: 12-120mm  |  Unit length (max) 3.2m.

EFW pipes

EFW is Electric Fusion Welding, a welding process without filler.

The EFW pipe division consists of a JCO forming press, helical / spiral mill, inside and outside welding system, heat treatment furnace and testing facilities.

The EFW pipe divison consists of a JCO forming press, helical / spiral mill, inside and outside welding system, heat treatment furnace and testing facilities. Welding process employed is gtaw for root-pass and saw/tig for final pass with suitable filler wires as prescribed by aws specifications and asme boiler and pressure vessel code, section-ix. These facilities are capable of manufacturing austenitic and various duplex grades.

Sunny Steel has been supplying EFW Electric Fusion Welded Pipe for many years. We supply EFW Electric Fusion Welded Pipe to the folowing industries on a global scale:

• Oil Industry
• Gas Industry
• Filtration Industry
• Refrigeration Industry
• Refining Industry
• Petrochemical Industry
• Offshore Industry

Electric Fusion Welded Pipe

EFW is Electric Fusion Welding, a welding process without filler.

The EFW pipe division consists of a JCO forming press, helical / spiral mill, inside and outside welding system, heat treatment furnace and testing facilities.

The EFW pipe divison consists of a JCO forming press, helical / spiral mill, inside and outside welding system, heat treatment furnace and testing facilities. Welding process employed is gtaw for root-pass and saw/tig for final pass with suitable filler wires as prescribed by aws specifications and asme boiler and pressure vessel code, section-ix. These facilities are capable of manufacturing austenitic and various duplex grades.

Sunny Steel has been supplying EFW Electric Fusion Welded Pipe for many years. We supply EFW Electric Fusion Welded Pipe to the folowing industries on a global scale:

• Oil Industry
• Gas Industry
• Filtration Industry
• Refrigeration Industry
• Refining Industry
• Petrochemical Industry
• Offshore Industry

Oval pipe

Oval pipe, flat oval pipe and elliptic pipe

For the best quality Oval Tubes, we serve as one-stop destination in the international market. Our Steel Oval Tubes are endurable and long lasting. They are extensively used in various industrial and engineering applications. Apart from that, we are identified as one of the reliable Oval Steel Tubes Manufacturers and Suppliers in the country.

The specialty of the oval pipe is the form itself. We offer two different types of oval pipe forms.
One is the elliptic pipe and the other the flat oval type.

Steel Grade: Q235, Q345, S235JR, S275JR, SS4007, Stainless

Flat oval pipes

Oval pipes are mainly produced with a diameter of 1,0 - 3,0 mm. Different wall thickness, materials and surfaces (e.g. IIIc, K240, K400, K600) as well as lengths can be produced on inquiry.

flat oval pipes

a	b	d	length in mm	material
30,0	15,0	1,5	6.000	1.4301
30,0	17,0	1,5	6.000	1.4301
35,0	15,0	1,5	6.000	1.4301
40,0	20,0	1,5	6.000	1.4301
48,0	20,0	1,5	6.000	1.4301
56,5	29,8	1,5	6.000	1.4301
60,0	20,0	1,5	6.000	1.4301
60,0	32,0	2,0	6.000	1.4301

Elliptic pipe

Elliptic pipes can generally be produced from 1,0 - 3,0 mm. Different wall thickness, material and surfaces (e.g. IIIc, K240, K400, K600) as well as length can be produced in inquiry.

Oval pipe elliptic

a	b	d	length in mm	material
26,3	16,2	1,5	6.000	1.4301
36,0	14,0	1,5	6.000	1.4301
40,0	28,5	1,5	6.000	1.4301
55,0	18,0	1,5	6.000	1.4301

Rectangular Hollow Sections

Rectangular steel tube comes in different sizes, specifications and wall thicknesses. Its uniformity makes it predictable to use and visually appealing. It has a high weight-to-strength ratio. It’s easy to bend, and because square steel tubing is inexpensive, it’s cost-effective- even for large projects.

We are manufacturing and exporting Rectangular Hollow Sections, Rectangular Hollow Steel Sections and Rectangular Hollow Section Tubes as per customer's requirement with anti rust oil coating from inside & outside of the tubes to ensure safe delivery to end customers.

Specialising in Steel, Cut to Length, Round, Square, Hollow, Rectangular, Rectangular Hollow Sections, RHS

• Steel Grade: Q235, Q345, S235JR, S275JR, SS4007
• Surface Finish: hot dipped galvanized, electro galvanized, black
• SHS (Square Hollow Section) Size range Table 3. 

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.

Pre-galvanized steel pipe

We can produce and supply to you various steel pipes according to international standard. Pre-galvanized steel pipes are used in the following fields, steel structure, build structure, guard rail, fence, metal furniture etc. our products are exported to about 50 countries in the world, we get a lot of recognition from many customers since our good quality and service.

Production standard: ASTM, JIS, BS, DIN, EN, API, GB
Section type: round, square, rectangular, oval and other special section type. 

British Standard (BS1387-85) Thin thickness pipe specification

		Outside Diameter (mm)			Weight of Black Pipe (kg/m)
Nominal Size (DN)	Screw Identifiers	Maximum	Minimum	Thickness	Plain end pipe	Threaded and With Coupler
15	1/2	21.4	21.0	2.0	0.947	0.956
20	3/4	26.9	26.4	2.3	1.38	1.39
25	1	33.8	33.2	2.6	1.98	2.00
32	11/4	42.5	41.9	2.6	2.54	2.57
40	11/2	48.4	47.8	2.9	3.23	3.27
50	2	60.2	59.6	2.9	4.08	4.15
65	21/2	76.0	75.2	3.2	5.71	5.83
80	3	88.7	87.9	3.2	6.72	6.89
100	4	113.9	113.0	3.6	9.75	10.0

Normal steel pipe size

		Outside Diameter (mm)			Weight of Black Pipe (kg/m)
Nominal Size ( DN)	Screw Identifiers	Maximum	Minimum	Thickness	Plain end pipe	Threaded and With Coupler
15	1/2	21.7	21.1	2.6	1.21	1.22
20	3/4	27.2	26.6	2.6	1.56	1.57
25	1	34.2	33.4	3.2	2.41	2.43
32	11/4	42.9	42.1	3.2	3.10	3.13
40	11/2	48.8	48.0	3.2	3.57	3.61
50	2	60.8	59.8	3.6	5.03	5.10
65	21/2	76.6	75.4	3.6	6.43	6.55
80	3	89.5	88.1	4.0	8.37	8.54
100	4	114.9	113.3	4.5	12.2	12.5
125	5	140.6	138.7	5.0	16.6	17.1
150	6	166.1	164.1	5.0	19.7	20.3

Galvanized Steel Pipe

Steel Pipes manufacturers and Exports huge range of ERW Galvanized Steel Tubes & Steel Pipes.

Steel Pipes manufacturers and Exports huge range of ERW Galvanized Steel Tubes & Steel Pipes. For pipes or tubes size 4 inch (10.2mm) OD and below, strip is fed into a set of forming rolls which consists of horizontal and vertical rollers so placed as to gradually from the flat strip in to a tube which is then allowed to pass the welding electrodes. The electrodes are copper disks connected to the secondary of a revolving transformer assembly. The copper disk electrodes make contact on each side of the seam and temperature is raised to the welding point. Outside flash is removed by a cutting tool as the tube leaves the electrodes, inside flash is removed either by an air hammer or by passing a mandrel through the welded tube after the tube has been cooled. This is termed as Electric Resistance Welded or ERW tube/pipe.

Steel Pipes manufacturers and Exports huge range of ERW Galvanized Steel Tubes & Steel Pipes. For pipes or tubes size 4 inch (10.2mm) OD and below, strip is fed into a set of forming rolls which consists of horizontal and vertical rollers so placed as to gradually from the flat strip in to a tube which is then allowed to pass the welding electrodes. The electrodes are copper disks connected to the secondary of a revolving transformer assembly. The copper disk electrodes make contact on each side of the seam and temperature is raised to the welding point. Outside flash is removed by a cutting tool as the tube leaves the electrodes, inside flash is removed either by an air hammer or by passing a mandnel through the welded tube after the tube has been cooled. This is termed as Electric Resistance Welded or ERW tube/pipe.

Tolerances

1. Outside Diameter : ±0.8%
2. Quality below 168.3mm : 0.50 mm
3. Quality including 168.3mm and above : 1.0mm
4. Thickness : ±10%
5. Weight Kg/Mtr: Single Tube : ±10%
6. For Truck Load of Tonnes : ± 7.5%

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

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.