... ect out diameter:15-450mm wall thcikness:2-25mm 7021 aluminium pipesouter diameter from 15mm to 450mmwall thickness from ... Systems.True seamless extruded by the die and mandrel method. Covers nine alloys in various tempers.ASTM-B-404Seamless Aluminum ... 6R05,6A10,6A51,6A60 7001,7003,7004,7005,7020,7021,7022,7039,7049,7050,7150,7055,7072,7075, ... ,8021,8050,8150,8079,8090,8A01,8A06, 7021 aluminium pipes