Stainless Steel Tube for the Food Industry

　　ASTM A554 “Specification for welded stainless steel mechanical tubing”

　　ASTM A270 “Specification for seamless and welded austenitic stainless steel sanitary tubing”

　　ASTM A269 “Specification for seamless and welded austenitic stainless steel tubing for general service”

　　ASTM A249 “Specification for welded austenitic steel boiler, super heater, heat exchanger, and condenser tubes”

　　AS 1528.1 “Specification for tubes (stainless steel) for the food industry”

　　AS1528 was revised in 2001 by key stakeholders in the Australian food manufacturing and tube industries. AS 1528 is unique, in that it covers all the associated fittings in addition to the tube.

　　Specification Comparison

　　Material

　　All specifications pertain to common grades, such as grades 304, 304L, 316 and 316L. AS1528.1 covers all grades of duplex and austenitic stainless steel listed in ASTM A240.

　　Manufacture

　　All specifications need fusion-welded products without filler metals. Specifications such as ASTM A270, ASTM A269 and AS 1528 also cover seamless products.

　　Dimensional Tolerances

　　Wall Thickness

　　ASTM A554 requires ±10% of nominal - no nominal thicknesses are stipulated.

　　ASTM A270 requires ±12.5% of nominal - no nominal thicknesses are stipulated.

　　ASTM A269 requires ±10% of nominal for sizes over ½" - no nominal thicknesses are stipulated.

　　ASTM A249 requires ±10% of nominal - no nominal thicknesses are stipulated.

　　AS 1528 specifies nominal thicknesses of 1.6mm for all outside diameters, (ODs) except 2 mm for 203.2 mm OD; other thicknesses can be specified by purchasers. Standard tolerance is +nil, -0.10mm. The all-minus tolerance recognizes the usual practice for tube, to all specifications, to be produced towards the lower limit of the tolerance range. A range of between 1.52 and 1.58 mm is typical. This tolerance also applies to tube fittings.

　　SRT is a Group Company. Full name is Hebei Shengtian Group Reaguan Pipeline Co., Ltd, which mainly produce and export seamless steel pipes, spiral  steel pipes, welded steel pipes and oil pipes .