The process of Ssaw steel pipe:
Steel coils→Ray material test → Delivery straightening → Plate cutting and welding → circle shear edge milling → Forming → inside auto-welding → Outside auto-welding → Online ultrasonic inspection → Fixed length cutting → Visual inspection for outside seam → Visusl inspection for inside seam → X-ray inspection for welding seam → Even end and end bevel → Hydrostatic test → Ultrasonic inspection → Final product inspection → Marking → Store up
A252 Comparitive Specifications
ASTM Specification A252 describes nominal (average) wall steel pipe piles of cylindrical shape and applies to pipe piles in which the steel cylinder acts as a permanent load-carrying member or as a shell to form case-in-place concrete piles.
Surface imperfections exceeding 25% of the nominal wall in depth are considered defects. Defects not exceeding 22.5% of the nominal wall in depth may be repaired by welding. Before welding, the defect shall be completely removed.
MECHANICAL PROPERTIES – TENSILE
Tensile Strength, min, psi
CHEMICAL REQUIREMENTS FOR A252
Seamless and Welded
•Testing Requirements for seamless and welded A252 steel piling pipe
oHydrostatic Testing: Not specified.
Tensile Test: Either longitudinal or transverse at option of manufacturer.
oNumber of Tests: One tensile test per 200 lengths.
•Permissible Variations for A252 steel piling pipe
oWall thickness: Not more than 12.5% under the nominal wall thickness specified.
oWeights per foot: The weight of any individual length of pipe shall not vary more than 15% over or 5% under the weight specified. Each individual length shall be weighed separately.
oOutside diameter: Shall not vary more than plus or minus 1% from the diameter specified.
•Lengths of A252 steel piling pipe
Steel Tubular Products A252 steel piling pipe may be ordered in single or double random lengths or in uniform lengths.
oSingle random – 16’ – 25’ inclusive
oDouble random – Over 25’ with a minimum average of 35’
oUniform – Plus or minus 1” on length specified
Rolled, die-stamped, or paint-stenciled (manufacturer’s option).
oManufacturer’s name, brand, or trademark
oMethod of pipe manufacture
oSize, weight, length
oASTM A252 and steel grade
Other Types of API 5L / ASTM A252/ EN10219-2/ ASTM A572Spiral Steel Pipe / SSAW Steel Pipe: