ASTM A334 steel boiler pipe 

Standard A 334 covers several grades of minimum-wall-thickness, seamless and welded, carbon and alloy-steel tubes intended for use at low temperatures. Some product sizes may not be available under this specification because heavier wall thicknesses have an adverse affect on low-temperature impact properties.
Grade: GR1 Gr3,GR6,GR7,Gr8,Gr9

Type:Seamless - Hot Rolled / Cold Drawn

Outer diameter:1/4" NB To 2" NB (Nominal Bore Size)

Wall thickness:1 mm Thickness to 8 mm Thickness

Application: Boiler, Heat exchanger, condenser, preheater, etc

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