Elliptic pipe

Elliptic pipe is less likely to become distorted or bent out of shape as its shape is much stronger than round tubing when it is used on its preferential axis.

Stainless steel elliptical oval pipes for railings Stainless steel elliptical oval pipes for railings

It is also more compact and the tube takes up less storage space, making it a good choice for smaller settings with limited workroom. Furthermore, the shape of steel oval pipe is more aerodynamic, which makes it the ideal option for products such as exhaust pipes on vehicles.

Oval pipe elliptic size range:

  • Elliptic pipes can generally be produced from 1,0 - 3,0 mm.
  • Flat 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.
elliptic pipes

Elliptic pipe size range

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

Delivery

Measurement size

Measure weld stee pipes
Measure weld stee pipes
Measure weld stee pipes
Measure weld stee pipes
Flat oval pipes
Flat oval pipes

Packing

Packing weld stee pipes
Packing weld stee pipes
Packing weld stee pipes
Packing weld stee pipes
Packing weld stee pipes
Packing weld stee pipes
Packing weld stee pipes
Packing weld stee pipes
Packing weld stee pipes

Welded pipes specification and size

API SPEC 5CT

Product Name Executive Standard Dimension (mm) Steel Code / Steel Grade
Casting API 5CT Ø48.3~273 x WT2.77~11.43 J55, K55, N80, L80
Tubing API 5CT Ø48.3~273 x WT2.77~11.43 J55, K55, N80, L80, H40

API SPEC 5L

Product Name Executive Standard Dimension (mm) Steel Code / Steel Grade
Line Pipes API 5L Ø60.3~273.1 x WT2.77~12.7 A25, A, B, X42, X46, X52, X56, X60, X65, X70, X80

ASTM / ASME

Product Name Executive Standard Dimension (mm) Steel Code / Steel Grade
Electric-Resistance-Welded Steel Pipes ASTM A135 Ø42.2~114.3 x WT2.11~2.63 A
Electric-Resistance-Welded Carbon Steel and Carbon-Manganese Steel Boiler and Superheater Tubes ASTM A178 42.2-114.3 x 2.11-2.63 A, C, D
ERW and Hot-dip Galvanized Steel Pipes ASTM A53 Ø21.3~273 x WT2.11~12.7 A, B
Pipes for Piling Usage ASTM A252 Ø219.1~508 x WT3.6~12.7 Gr.2, Gr.3
Tubes for General Structural Purpose ASTM A500 Ø21.3~273 x WT2.11~12.7 Gr.2, Gr.3
Square Pipes for General Structural Purpose ASTM A500 25 x 25~160 x 160 x WT1.2~8.0 Carbon Steel

DIN

Product Name Executive Standard Dimension (mm) Steel Code / Steel Grade
Threaded Steel Pipes DIN 2440 Ø21~164 x WT2.65~4.85 Carbon Steel

BS

Product Name Executive Standard Dimension (mm) Steel Code / Steel Grade
Screwed and Socketed Steel Tubes BS 1387 Ø21.4~113.9 x WT2~3.6 Carbon Steel

EN

Scaffolding Pipes EN 39 Ø48.3 x WT3.2~4 Carbon Steel

JIS

Product Name Executive Standard Dimension (mm) Steel Code / Steel Grade
Carbon Steel Tubes for General Structure Purpose JIS G3444 Ø21.7~216.3 x WT2.0~6.0 Carbon Steel
Carbon Steel Tubes for Machine Structure Purpose JIS G3445 Ø15~76 x WT0.7~3.0 STKM11A, STKM13A
Carbon Steel Pipes for Ordinary Piping JIS G3452 Ø21.9~216.3 x WT2.8~5.8 Carbon Steel
Carbon Steel Pipes for Pressure Service JIS G3454 Ø21.7~216.3 x WT2.8~7.1 Carbon Steel
Carbon Steel Rigid Steel Conduits JIS G8305 Ø21~113.4 x WT1.2~3.5 G16~G104, C19~C75, E19~E75
Carbon Steel Rectangular Pipes for General Structure JIS G3466 16 x 16~150 x 150 x WT0.7~6 Carbon Steel
Frequently Asked Questions
The coil used for production has lower alloy content than similar steel plates, which brings better weldability. Besides, the rolling direction of the coil is not perpendicular to the pipe axis, so the finished pipe owns excellent crack resistance.
Welded steel pipe is a seamed steel product manufactured by bending steel strip or steel plate into round, square or other shapes and then welding. Its raw materials are steel sheets or strips. With the development of strip rolling, welding and inspection technology, welded pipes have richer specifications and more reliable quality.
Nickel and chromium are key elements for anti-corrosion performance. Higher nickel content provides stronger resistance against acid environments such as sulfuric acid and hydrochloric acid. Adding chromium alone can also effectively prevent corrosion.
Poor edge condition of steel strip, irregular shape and dimensional deviation at the head and tail of uncut steel strip will lead to hard bending of the strip and further cause weld misalignment. This defect may result in product downgrade.
General technical requirements and inspection rules follow GB3092 Welded Steel Pipes for Low-Pressure Fluid Transmission. Hydrostatic test complies with relevant pressure regulations, and eddy current flaw detection is implemented according to GB7735 Steel Tube Eddy Current Flaw Detection Inspection Method.
Defects like folds, cracks, delamination and lap welding are strictly prohibited. Minor scratches, weld misalignment, burns and scars that do not exceed wall thickness negative deviation are acceptable. Wall thickening and inner weld beads at welding seams are also permitted.
Welded pipes shall undergo mechanical property test, flattening test and flaring test. They must withstand a 2.5Mpa hydrostatic pressure test for 1 minute without leakage. Eddy current flaw detection can be used as an alternative to hydrostatic test.
Qualified pipes are cut to fixed length by flying saw, then transported via turning frame. Both pipe ends are chamfered and flattened, marked clearly, and finally bundled into hexagonal bundles for delivery.
The weld seam of straight seam steel pipe is parallel to the pipe longitudinal direction. It can adopt narrow blanks to produce large-diameter pipes, and the same-width blanks can make pipes of different diameters. Its disadvantage is longer weld seam and lower production efficiency compared with spiral welded pipe.
There are four mainstream processing methods: Forging, Extrusion, Rolling and Steel Drawing. Forging uses impact or pressure to shape steel; Extrusion is widely used for non-ferrous metal pipes; Rolling reduces cross-section by roller compression; Steel Drawing is mainly applied to cold working to narrow pipe diameter and extend length.
Surface quenching and tempering generally adopt induction heating or flame heating. Local quenching can also be realized by induction heating for parts requiring partial high hardness.
Vickers hardness tester is commonly used. Rockwell hardness tester is also available: use HRA scale when hardened layer thickness is 0.4-0.8mm, and HRC scale when thickness exceeds 0.8mm. For shallow hardened layers, superficial Rockwell hardness tester with HRN scale is recommended.
Yes. Vickers, Rockwell and superficial Rockwell hardness values can be converted to one another. Corresponding conversion tables are provided in ISO, ASTM and GB/T standards.
Square hollow section

Square Hollow Section

Square hollow sections for structural applications and construction projects.
Rectangular Hollow Section

Rectangular Hollow Section

Rectangular hollow sections used in various building and construction industries.
Pre-galvanized steel pipes

Pre-galvanized Steel Pipes

Pre-galvanized steel pipes for enhanced corrosion resistance and durability.
Stainless Steel Square / Rectangular Tubes

Stainless Square / Rectangular Tubes

Stainless steel tubes available in square and rectangular shapes for various uses.
Stainless steel oval pipe

Stainless Steel Oval Pipe

Stainless steel oval pipes for unique design requirements and applications.
Flat oval pipes

Flat Oval Pipes

Flat oval pipes designed for specific structural and aesthetic needs.
Elliptic pipe

Elliptic Pipe

Elliptic pipes for creating elliptical shapes and structures in construction.
Oval pipe

Oval Pipe

Oval pipes perfect for decorative and functional applications in various industries.
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