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ASTM A252 Spiral Steel pipes as piles from China Borun steel ASTM A252 is the standard specification for welded and seamless steel pipe piles. And it contains GR1, GR2, GR3 grades. This specification covers nominal wall cylindrical steel pipe piles in which the steel cylinder acts as a permanent load-carrying member or as a shell to form cast-in-place concrete piles. Each welded pile shall be made by seamless, electric resistance welding, flash welding or fusion welding with
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