TP316 TP316L TP316H TP316Ti TP316N TP316LN Stainless Steel Pipe

Stainless 316 is the standard molybdenum-bearing grade, second in importance to 304 amongst the austenitic stainless steels. The molybdenum gives 316 better overall corrosion resistant properties than Grade 304, particularly higher resistance to pitting and crevice corrosion in chloride environments.

Stainless 316L is the low carbon version of 316 and is immune from sensitisation (grain boundary carbide precipitation). When cold worked, 316 can produce high yield and tensile strengths similar to Duplex stainless grades.

Stainless 316H is a higher carbon variant of 316 making the steel more suitable for use in applications where elevated temperatures are present.

Stainless 316Ti (UNS S31635) is a titanium stabilised version of 316 molybdenum-bearing austenitic stainless steel.

Stainless 316N is the standard molybdenum-bearing steel grade. It provides excellent forming and welding characteristics. In variety of parts for applications in the industrial, architectural, and transportation fields it readily brake or roll formed. It also has outstanding welding characteristics.

Stainless 316LN (UNS S31653) is a lowcarbon, nitrogen-enhanced version of Type 316 molybdenum-bearing austenitic stainless steel.

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

Applications

• Typical applications include:
• Food preparation equipment particularly in chloride environments.
• Laboratory benches & equipment.
• Coastal architectural panelling, railings & trim.
• Boat fittings.
• Chemical containers, including for transport.
• Heat Exchangers.
• Woven or welded screens for mining, quarrying & water filtration.
• Threaded fasteners.

Grade specifications

Grade	UNS No	Old British		Euronorm		Swedish SS	Japanese JIS
		BS	En	No	Name
316	S31600	316S31	58H, 58J	1.4401	X5CrNiMo17-12-2	2347	SUS 316
316L	S31603	316S11	–	1.4404	X2CrNiMo17-12-2	2348	SUS 316L
316H	S31609	316S51	–	1.4919	X6CrNiMoB17-12-2	–	SUS 316H
316Ti	S31635	320S31		1.4571	X6CrNiMoTi17-12-2	2350	SUS 316Ti
316N	S31651						SUS 316N
316LN	S31653	316S61		1.4406	X2CrNiMoN17-11-2		SUS 316LN

Composition ranges

Grade		C	Mn	Si	P	S	Cr	Mo	Ni	Other
316	Min	–	–	–	0	–	16.0	2.00	10.0	–
	Max	0.08	2.0	0.75	0.045	0.03	18.0	3.00	14.0	N 0.10
316L	Min	–	–	–	–	–	16.0	2.00	10.0	–
	Max	0.03	2.0	0.75	0.045	0.03	18.0	3.00	14.0	N 0.10
316H	Min	0.04	0.04	0	–	–	16.0	2.00	10.0	–
	max	0.10	0.10	0.75	0.045	0.03	18.0	3.00	14.0	–
316Ti	Min	–	–	–	–	–	16.0	2.00	10.5
	max	0.08	2.0	1.0	0.045	0.015	18.0	2.50	13.5	Ti 0.7
316N	Min	–	–	–	0	–	16.0	2.00	11.0	N 0.10
	Max	0.08	2.0	0.75	0.045	0.03	18.0	3.00	14.0	N 0.16
316LN	Min	–	–	–	–	–	16.0	2.00	10.0	N 0.12
	Max	0.03	2.0	0.75	0.045	0.015	18.0	2.50	12.5	N 0.22

Mechanical Properties

Grade	Tensile Str (MPa) min	Yield Str 0.2% Proof (MPa) min	Elong (% in 50 mm) min	Hardness
				Rockwell B (HR B) max	Brinell (HB) max
316	515	205	40	95	217
316L	485	170	40	95	217
316H	515	205	40	95	217

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

Excellent in a range of atmospheric environments and many corrosive media – generally more resistant than 304. Subject to pitting and crevice corrosion in warm chloride environments, and to stress corrosion cracking above about 60 °C. Considered resistant to potable water with up to about 1000 mg/L chlorides at ambient temperatures, reducing to about 500 mg/L at 60 °C.

316 is usually regarded as the standard “marine grade stainless steel”, but it is not resistant to warm sea water. In many marine environments 316 does exhibit surface corrosion, usually visible as brown staining. This is particularly associated with crevices and rough surface finish.

Heat Resistance

Good oxidation resistance in intermittent service to 870 °C and in continuous service to 925 °C. Continuous use of 316 in the 425-860 °C range is not recommended if subsequent aqueous corrosion resistance is important. Grade 316L is more resistant to carbide precipitation and can be used in the above temperature range. Grade 316H has higher strength at elevated temperatures and is sometimes used for structural and pressure-containing applications at temperatures above about 500 °C.

Heat Treatment

Solution Treatment (Annealing) – Heat to 1010-1120 °C and cool rapidly. These grades cannot be hardened by thermal treatment.

Welding

Excellent weldability by all standard fusion methods, both with and without filler metals. AS 1554.6 pre-qualifies welding of 316 with Grade 316 and 316L with Grade 316L rods or electrodes (or their high silicon equivalents). Heavy welded sections in Grade 316 require post-weld annealing for maximum corrosion resistance. This is not required for 316L. Grade 316Ti may also be used as an alternative to 316 for heavy section welding.

Machining

A “Ugima” improved machinability version of grade 316 is available in round and hollow bar products. This machines significantly better than standard 316 or 316L, giving higher machining rates and lower tool wear in many operations.

Dual Certification

It is common for 316 and 316L to be stocked in “Dual Certified” form – mainly in plate and pipe. These items have chemical and mechanical properties complying with both 316 and 316L specifications. Such dual certified product does not meet 316H specification and may be unacceptable for high temperature applications.