A105 is the United States ASTM standard number, A on behalf of the ordinary carbon structural steel. Standard Name: Carbon Steel Forgings for Piping Components. Because this standard only provides for a carbon steel forgings, A105 even if a kind of forgings carbon steel grades. A105 is also a material code, is a special steel, is a cold forged steel. A105 is a low carbon steel forgings. The standard is the United States standard "ASTM A105 / A105M pipe components with carbon steel forgings"

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Slip On Flange generally only connected with the pipe, but can not be directly connected with the pipe fittings; Butt welding flange can be generally all welded pipe fittings (including elbow, tee, reducer, etc.) directly connected, of course, including pipeline.

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