Standard: API SPEC 5L (Latest edition)
Grades: B, X42, X52, X56, X60, X65, X70 and S (S for sour service, for example X70QS)
Steel Pipe Dimensions OD: 1/2” to 2”, 3”, 4”, 6”, 8”, 10”, 12”, 16 inch, 18 inch, 20 inch, 24 inch, 26 inch to 40 inch.
Pipe Weight Schedule Thickness: SCH 10. SCH 20, SCH 40, SCH STD, SCH 80, SCH XS, to SCH 160
Ends Type: Beveled ends, Plain ends
Length Range: 20 FT (6 meter), 40FT (12 meter)or customized
Protection Caps in plastic or iron
Surface: Natural, Varnished, Black painting, FBE and 3PE, Cladding and Lined etc
CRA Clad and lined pipe available (Carbon steel + cladding or lined alloy steel material)
a. For outer diameters less than 2 3/8 in (60.3 mm), pipe body diameter tolerance +/-0.5 mm. Pipe end +/- 0.5 mm; Out of Roundness tolerance for pipe body is
0.9 mm (0.036 in), pipe end 0.6 mm (0.024 mm).
b. For OD equal or above 2 3/8 in (60.3) to 24 in (610 mm), (diameter tolerance) for pipe body is +/- 0.0075D, pipe end +/- 0.005D but max to +/- 1.6 mm (0.063mm);
Roundness tolerance for pipe body ≤ 0.015D, pipe end ≤ 0.01D.
(In case agreed with manufacturer and client, more strictly tolerances could be applied)
c. For wall thickness
Below than 4 mm (0.0157 in), tolerance +0.6 (0.024 mm), -0.5 mm (0.020 in);
For API 5L seamless steel pipe thickness in 4 mm to 10 mm (0.394 in), +0.150t, -0.125t;
For API seamless pipe thickness 10 mm to 25mm (0.984 in), +/-0.125t;
Wall thickness ≥ 25 mm, +3.7mm or +0.1t (if larger) and -3.0 mm (0.120 in) or -0.1t (if larger).
t for thickness;
d. For straightness, max for full length, tolerance maximum 0.15% of length.
e. Straightness, max deviation for pipe end, shall be ≤ 0.3 mm /m.
f. Length +/- 200 mm for general, +/- 25.4 mm for special.
API 5L Seamless steel pipe production methods can be divided into: Hot-rolled seamless pipe, Cold drawn (rolled) pipe and tube, Thermal expansion pipe, Cold spinning tube and Squeeze tubes.
Formation – Seamless API steel pipes are made from a round steel billet while welded pies are made from a strip which is rolled and welded. The formation process of seamless pipes involves
forging, perforation, rolling, and shaping all at a time. The defects in the steel can be easily eliminated during the rolling process. On the other hand, the formation process of seamed or
welded pipes involves bending plates and welding in desired shapes. The process of making welded pipes is less expensive, and hence, the prices are lower. But in terms of
performance, seamless ones are way ahead.
Hot Rolling Seamless Steel Line Pipe Manufacturing / Production processes
Rolled Round Billets – Examination – Cut Off – Heating – Piercing – Elongation – Slight Tension Reducing – Straightening – Corp End Cutting Off – Visual Inspection – NDT – Hydrostatic
Test – Ends Procession – Product Inspection – Painting and Marking – Packing – Warehousing
Mother pipe (Normally for hot rolled pipe) – Inspection – Annealing – Ends Treatment (Hitting and Drilling hole) – Pickling – Grinding – Phosphorization (Annoit)
– Cold Drawn (Rolled) – Degreasing and Cleaning – Heat treatment (Solution treatment) – Straightening – Hydrostatic test – Painting and Marking – Warehousing
Top seamless steel pipe manufacturers in China, with high quality and competitive prices.
Further more, we offer:
a. Common sizes in stock.
b. Small quantity with different sizes.
c. Customized Length.
d. NACE MR 0175 pipe material stock available.
e. Fast delivery.
f. Big diameters seamless steel pipe in API standards. (Original seamless pipe in 20” 508 mm OD) Hot expanded to diameter up to 40 in, 1016 mm.
g. Material guaranteed high quality with full traceability.
