Astm A139 Welded Spiral Steel Standard Hollow Section Ssaw Steel
Pipe
SSAW Steel Pipe (Spiral steel tube) is a spiral welded steel tube
made of strip steel coil as raw material, usually formed by warm
extrusion, and welded by automatic double-wire double-side
submerged arc welding process. The spiral steel tube feeds the
strip into the welding tube unit, and after rolling with multiple
rollers, the strip is gradually rolled up to form a round tube
blank with open clearance. The pressure reduction of the extrusion
roller is adjusted so that the weld clearance is controlled at
1~3mm and both ends of the welding joint are flush.Main
technological features of spiral steel tube:In the forming process,
the steel plate deformation uniformity, the residual stress is
small, the surface does not produce scratches. The processed spiral
steel pipe has greater flexibility in the size and specification
range of diameter and wall thickness, especially in the production
of high-steel grade thick wall pipe, This specification covers five
grades of electric-fusion (arc)-welded straight-seam or spiral-seam
steel pipe in 4" to 92" inclusive with wall thickness up to 1 "
inclusive.Pipe having other dimensions may be furnished provided
such pipe complies with all other requirements of this
specification and the grades of steel of the manufactured pipes.
The pipe is intended for conveying liquid, gas, or vapor.Each
length of pipe shall be tested by the manufacturer to a hydrostatic
pressure that will produce in the pipe wall a stress of not less
than 60% of the minimum specified yield point at room
temperature.The pressure shall be determined by the following
equation : p=2st/d.Test pressure shall be held for not less than 5
sec., or for a longer time as agreed upon between the purchaser and
the manufacturer.When agreed upon by the purchaser and the
manufacturer and so stated on the order, pipe may be tested :to 1
1/2 times the working pressure with condition it does not exceed
2800-psi, nor shall the maximum fiber stress exceed 85% of minimum
yield point of the grade of steel used.to a fiber stress which does
not exceed 85% of the minimum yield point of the grade of steel
used or exceed 2800-psi test pressure.
Product | Astm A139 Welded Spiral Steel Standard Hollow Section Ssaw Steel
Pipe |
Standard | Astm a139 En10219,En10217-1,API 5L PSL1,Astm a252 |
Material | Grade B,C,D,S355J0H,s235jrh,s355j2h |
OD | 406 mm |
Wt | 8 mm |
Length | 6-14 meter |