Hygienic Tube™ 304L | 316L

Stainless Steel Hygienic Tube™ 304L | 316L

Producing a quality product consistently, starts with the base material. Hygienic Tube™ is New Zealand manufactured from stainless cold rolled coil strip ASTM A240M in grade 304L or 316L.

304L performs well in most sanitary or food grade applications and is often specified due to price point and the required lifecycle of the installation.
316L is generally used in higher heat applications, with more aggressive detergent solutions, where heavy water is used (often dictating higher acid dilution) or where harsher local conditions may require this to be specified.

We use low carbon 304L and 316L, mainly to avoid carbide precipitation, improve welding performance and allow a more formable product. The surface finish is 2B, cold rolled, annealed and pickled, giving a smooth corrosion resistant surface.

The testing we undertake during manufacture as part of AS 1528.1 is designed to test the integrity of the base material, the weld zone and suitability for pressure purposes. These can be separated into non-destructive testing (NDT) methods and destructive (mechanical) testing.

304L | 316L Specifications

Base Material	Cold-rolled, annealed and skin-passed coil strip (2B) in grades 304L or 316L
Yield Strength	170 MPa (Base Material)
Tensile Strength	485 MPa (Base Material)
Base Material Standard	ASTM A240/A240M
Product Standard	AS 1528.1 Test certificates are provided with each order as per EN10204 Type 3.1
Other Standards	ASTM A249 - Austenitic Steel Boiler, Superheater, Heat-Exchanger & Condenser. ASTM A269 - Welded Austenitic Stainless Steel Tubing for General Service.
Surface Finish	Buff polished to a 320G finish. AWBP (As Welded Buff Polish) CWBP (Cold Worked Buff Polish)
Internal Surface Quality	Typically 0.2μm to 0.6μm Ra (excluding the weld zone).
Weld	The internal weld zone roughness allows for a maximum Rt value of 14.0μm. Our results typically range from 2.0 to 6.5 Rt Longitudinally welded TIG process, no additional filler material.
Annealing	ASTM A249 or A269
Product type	304L and 316L
Identification	ITMNZ HYGIENIC - TUBE
Standard stocked lengths	6.0m. Custom lengths available.
Tube Profile	Round
Tolerance	As per AS 1528.1
Guage (mm)	0.9, 1.2, 1.6, 2.0
Size Range - Round	From 6.35mm to 203.2mm
Packaging	304L is sleeved in clear plastic, 316L in blue plastic Bundles are strapped with timber cleats and plywood for the forklift plate. See sizing table for individual bundle sizes.
Typical Applications:	Food and beverage processing lines, in dairy factories, breweries, wineries, distilleries and other sanitary processing applications. Annealing Stainless Steel Tube applications include boilers, superheaters, heat exchangers, condenser systems, pressure equipment to transfer heat and some hydraulic applications.

304L & 316L Base Material - Typical Mechanical Properties

Yield strength	Tensile strength	EI % on Lo=50mm
170 MPa	485 MPa	40

Stainless Steel Tube Sizing

Round Tube

Size (mm)	Product Type & Gauge (mm)		Finish	Nom Linear mass (kg/m)				Length per pack
Size (mm)	304L	316L	Finish	0.9	1.2	1.6	2.0	Length per pack
6.35	0.9		AWBP	0.13				50
7.95	0.9		AWBP	0.16				50
9.5	0.9, 1.2	1.2	AWBP	0.19	0.25	0.31		50
12.7	0.9, 1.2, 1.6	1.2, 1.6	AWBP	0.27	0.34	0.44		50
15.9	0.9, 1.2, 1.6	1.2, 1.6	AWBP	0.33	0.43	0.56		50
19.1	0.9, 1.2, 1.6	1.6	AWBP	0.41	0.53	0.69	0.88	50
22.2	0.9, 1.2, 1.6		AWBP	0.47	0.61	0.81	1.04	50
25.4	0.9, 1.2, 1.6, 2.0	1.2, 1.6	AWBP	0.55	0.72	0.94	1.22	50
31.8	1.2, 1.6	1.2, 1.6	CWBP	0.69	0.92	1.19	1.54	50
38.1	0.9, 1.2, 1.6	1.2, 1.6	CWBP	0.83	1.10	1.44	1.87	50
44.5	1.6, 2.0	1.6	CWBP	0.95	1.29	1.69	2.15	50
50.8	0.9, 1.2, 1.6, 2.0	1.6, 2.0	CWBP	14.1	1.47	1.94	2.41	50
63.5	1.2, 1.6	1.6	CWBP		1.84	2.44	3.06	28
76.2	1.2, 1.6	1.6	CWBP		2.17	2.94	3.86	28
101.6	1.6, 2.0	1.6, 2.0	CWBP			3.46	4.91	18
127.0	1.6	1.6	CWBP			4.96	6.15	8
152.4	1.6, 2.0	1.6, 2.0	CWBP			5.97	7.46	8
203.2	2.0	2.0	CWBP				9.96	5