This article provides the alternative specifications for the Australian food industry service. Such specifications include:
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”
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.
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.
All specifications need fusion-welded products without filler metals. Specifications such as ASTM A270, ASTM A269 and AS 1528 also cover seamless products.
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.
* ASTM A554 tolerances for the weld bead removed condition. * AS1528 also covers OD sizes 12.7, 19.0, 31.8, 127.0, 152.4 and 203.2mm
All these tube specifications provide limits for wall thickness and OD. The inside diameters are not mentioned separately.
The surface finish properties of various specifications, recommended for Australian food industry services, are as follows:
The handling products used in the food industry require a tube without weld bead remnant on the inner surface.
The mechanical properties of various stainless steel grades, commonly used in food industries, are given below:
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