What is ASTM A252 Grade 2 Grade 3 Piling Pipe?
ASTM A252 Grade 2 Grade 3 Piling pipe is an industrial spiral seam steel pipe widely used in pile foundation construction for deep-water offshore wharves, bridges, roads, and high-rise buildings in coastal, river, and lake areas. It can reach a maximum diameter of 3,620 mm, primarily made of Q235 and Q345 materials, with customization available. Its outer diameter range is 219-3,620 mm, with lengths typically between 8-12 meters. It is manufactured by flattening, edge trimming, and forming steel coil plates followed by double-sided submerged arc welding (SAW) processes. The welds undergo multiple inspection procedures including ultrasonic testing, X-ray re-examination, and hydrostatic testing.
ASTM A252 Grade 2 Grade 3 Piling Pipe Manufacturing Process
ASTM A252 Grade 2 Grade 3 Spiral steel pipe is produced by cold-forming steel coil into a spiral shape and welding it using automatic double-wire double-sided submerged arc welding (SAW).
(1) Raw materials (steel coil, welding wire, and flux) undergo strict physical and chemical testing before use.
(2) End-to-end coil welding is performed using single or double-wire SAW, with additional SAW for repair after coiling into a pipe.
(3) Pre-forming treatment: The coil undergoes leveling, edge trimming, planing, surface cleaning, and pre-bending before forming.
(4) Pressure control: An electrical pressure gauge ensures stable coil feeding by regulating hydraulic pressure on both sides of the conveyor.
(5) Forming method: External or internal roller forming is used.
(6) Weld gap control: A dedicated device ensures proper weld gap, strictly controlling pipe diameter, misalignment, and weld clearance.
(7) Welding: Both internal and external welds use Lincoln electric welders (single or double-wire SAW) for consistent welding parameters.
(8) In-line ultrasonic testing: Every weld undergoes continuous automatic ultrasonic inspection for 100% coverage. Defects trigger alarms and marking, allowing immediate process adjustments.
(9) Cutting: Pipes are cut into individual lengths using air plasma cutting.
(10) First-piece inspection: The first three pipes per batch undergo rigorous checks on weld mechanical properties, chemical composition, fusion quality, surface finish, and NDT before full production.
(11) Defect re-examination: marked weld areas with ultrasonic indications undergo manual ultrasonic and X-ray re-examination. Confirmed defects are repaired and re-inspected until cleared.
(12) X-ray inspection: All coil butt welds and T-joints intersecting spiral welds are examined via X-ray TV or film.
(13) Hydrostatic testing: Each pipe undergoes radial-seal pressure testing with parameters strictly controlled by a computer system and automatically recorded.
(14) End machining: Pipe ends are mechanically processed to ensure precise perpendicularity, bevel angle, and blunt edge dimensions.
ASTM A252 Grade 2 Grade 3 pile pipe Specification
Usage: Used for low pressure liquid delivery,such as water, gas,and oil; construction and piling
Standard: API 5L, API 5CT,ASTM A252,ASTM 53, EN10217, EN10219, BS 5950,ASTM A572,JIS, IS,
Certificate: EN10217, EN10219,API 5L PSL1/ PSL2,API 5CT
Size:Out Diameter:219.1mm-3048mm
Wall Thickness:5.0mm-30mm
Length: Up to 70m
Steel Grade:
API 5L:GR A, GR B,X42,X46, X56,X60,X65,X70
ASTM A252 GR 1, GR 2,GR 3
ASTMA53:GR A, GR B, GR C, GR D
BS 4360:Grade 43,Grade 50
EN: S275,S275JR, S355JRH, S355J2H
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