304 304L 304H 1.4301 1.4306 1.4948 Stainless Steel Pipe and Tube

Stainless Steel 304 is made up of a stainless material that has 18% chromium and 8% nickel in its composition. The material has corrosion resistance and strength properties. 304 stainless steel is an excellent candidate for most processing techniques as well as both indoor and outdoor applications. This product, designed for close tolerances, has a semi-smooth, dull grey finish and sharp defined edges with accurate dimensions throughout length. 304 stainless steel is a high strength material with excellent corrosion resistance making it ideal for shelves, brackets, bracing, sculptures, and other architectural uses. Also found within the food and beverage industry, aerospace applications, and chemical processing.

Stainless Seamless Fluid Pipe Quality Control

1. Raw materials pipe blank quality classification: high quality, medium, economical
2. Raw materials inspection after receive in factory
3. After pickled, tube will be grinded careful to less defect
4. Multiple cold drawn/rolled process for precision dimension
5. Standard heat-treated of continuous annealed/solution for better property, intergranular corrosion
6. Full Inspection: ET, UT, Hydraulic Test, Penetration Test, Grinded, Sand Blast, Print Making

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We also can supply other kinds of:

• Seamless Stainless Steel Pipe & Tube
• Welded Stainless Steel Pipe & Tube
• U Type Stainless Steel Pipe & Tube
• Coil Type Stainless Steel Pipe & Tube(Max 300meter), seamless or welded
• Annealed Pickled AP Stainless Steel Pipe & Tube (Ra ≤5μm)
• Bright Annealed BA Stainless Steel Pipe & Tube (Ra ≤8μm)
• Mechanical Polished MP Stainless Steel Pipe & Tube (Ra ≤8μm)
• Electro Polished EP Stainless Steel Pipe & Tube (Ra ≤25μm)
• Sanitary Stainless Steel Pipe & Tube
• Capilllary Stainless Steel Pipe & Tube
• Instrument Stainless Steel Pipe & Tube

Typical Applications

• Food processing equipment, particularly in beer brewing, milk processing & winemaking
• Kitchen benches, sinks, troughs, equipment and appliances
• Architectural paneling, railings & trim
• Chemical containers, including for transport
• Heat Exchangers
• Woven or welded screens for mining, quarrying & water filtration
• Threaded fasteners
• Springs

Grade Specification Comparison

Grade	UNS No	BS	Euronorm		Swedish SS	Japanese JIS
			No	Name
304	S30400	304S31	1.4301	X5CrNi18-10	2332	SUS 304
304L	S30403	304S11	1.4306	X2CrNi19-11	2352	SUS 304L
304H	S30409	304S51	1.4948	X6CrNi18-11	–	–

Composition

Grade	C	Mn	Si	P	S	Cr	Ni	N
304	– 0.08	– 2.0	– 0.75	– 0.045	– 0.030	18.0 20.0	8.0 10.5	– 0.10
304L	– 0.030	– 2.0	– 0.75	– 0.045	– 0.030	18.0 20.0	8.0 12.0	– 0.10
304H	0.04 0.10	– 2.0	– 0.75	-0.045	– 0.030	18.0 20.0	8.0 10.5	–

Mechanical Properties:

Grade	Tensile Strength (MPa) min	Yield Strength 0.2% Proof (MPa) min	Elongation (% in 50 mm) min	Hardness
				Rockwell B (HR B) max	Brinell (HB) max
304	515	205	40	92	201
304L	485	170	40	92	201
304H	515	205	40	92	201

Stainless Steel Tube & Pipe Sizes:

Outsider Diameter OD : 6-630mm ; WT 3-60mm ; L max 16meter

Stainless Steel Tube Delivery Condition:

• Solution Treatment

Stainless Tube Surface:

Acid pickling – pre-passivation process of treating stainless steel parts with an acid solution, typically hydrochloric or sulfuric acid, which can remove oxide scale and heat tint while dissolving steel flecks embedded in the part.

Polishing – P grade sandpaper: P150, P200, P250, P300, P400, P500, P600, P700, P800

Stainless Pipe Inspection and Testing:

Chamical analysis / Tensile test at room temperature / flattening test / ring tensile test / drift expemdomg test / ring expanding test / leak tightness test / Tensile test at elevated temperature / impact test at room temperature / impact test at low temperature / eddy current test / ultrasonic test / magnetic flux leakage test

Stainless Tube Marking and Packages:

In addition to the marking prescribed in specification as client’s request.

Bare / Nylon / Plastic / Wooden Case

Corrosion Resistance

Grade 304 stainless steel is excellent in a wide range of atmospheric environments and many corrosive media. It is subject to pitting and crevice corrosion in warm chloride environments, and to stress corrosion cracking above 60 °C (approximate). Grade 304 is considered to be resistant to potable water up to approximately 200 mg/L chlorides at ambient temperatures, reducing to approximately150 mg/L at 60 °C.

Heat Resistance

Grade 304 has good oxidation resistance in intermittent service to 870 °C, and in continuous service to 925 °C. Continuous use of 304 in the 425-860 °C range is not recommended if subsequent aqueous corrosion resistance is important. Grade 304L is more resistant to carbide precipitation and can be heated into this temperature range.

Grade 304H has higher strength at elevated temperatures so is often used for structural and pressure-containing applications at temperatures above 500 °C up to about 800 °C (approximate). 304H will become sensitized in the temperature range of 425-860 °C. Whilst this is not a problem for high-temperature applications, it will result in reduced aqueous corrosion resistance.

Heat Treatment

During Solution Treatment (Annealing) Grade 304 can be heated to 1010-1120 °C and is then cooled rapidly. These grades cannot be hardened by thermal treatment.

Welding

Grade 304 has excellent weldability by all standard fusion methods, both with and without filler metals. AS 1554.6 pre-qualifies welding of 304 with Grade 308 and 304L with 308L rods or electrodes (and with their high silicon equivalents). Heavy welded sections in Grade 304 may require post-weld annealing for maximum corrosion resistance. This is not required for Grade 304L. Grade 321 may also be used as an alternative to 304 if heavy section welding is required and post-weld heat treatment is not possible.

Machining

A improved machinability version of grade 304 is available in bar products. machines significantly better than standard 304 or 304L, giving higher machining rates and lower tool wear in many operations.