316L Stainless Steel Seamless Pipes Grades
Type 304 | Type 304L | Type 304H | Type 316 | Type 316L | Type 316H | Type 317L | Type 321 | Type 347 | Type 410 | Type 904L | UNS 32750 Duplex
316L Stainless Steel Seamless Pipes
ASTM A/ASME SA213/A249/A269/A312/A358 CL. I to V ASTM A789/A790 TP 304 Stainless Steel Pipes and Tubes
Type 316L is the low carbon version of 316 stainless. With the addition of molybdenum, the steel is popular for use in severe corrosion environments due to the materials immunity from boundary carbide precipitation (sensitisation).
Size : 1/8"NB TO 42"NB IN
Schedule: SCH 10, SCH20, SCH30, SCH40, STD, SCH60, XS, SCH80, SCH120, SCH140, SCH160, XXS
Type : Seamless / ERW / Welded / Fabricated / LSAW Pipes
Form : Round, Square, Rectangular, Hydraulic Etc.
Length : Single Random, Double Random & Cut Length.
End : Plain End, Beveled End, Treaded.
Nickel Alloy Pipe Standard:
• UNS 10276 (HASTELLOY C 276 Pipe)
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• UNS 2200 (NICKEL 200 Pipe) |
• UNS 2201 (NICKEL 201 Pipe ) |
• UNS 4400 (MONEL 400 Pipe) |
• UNS 8020 (ALLOY 20 Pipe) |
• UNS 8825 INCONEL (825 Pipe) |
• UNS 6600 (INCONEL 600 Pipe ) |
• UNS 6601 (INCONEL 601 Pipe) |
• UNS 6625 (INCONEL 625 Pipe) |
Benefits of using Type 316L Stainless Steel
- Low carbon content eliminates carbon precipitation in the welding process
- Can be used in severe corrosive environments
- Improved anti-corrosion scope due to added Molybdenum
- Weld annealing only required in high stress applications
- Very similar to Grade 316 in chemical composition and mechanical properties
316 & 316L steel plate and pipes have common properties and are often stocked with Dual Certification, where it is determined that both have properties and composition which comply with both steel types.
Type 316H is excluded from this scenario by virtue of the fact that unlike 316 & 316L, 316H is engineered to work in elevated working temperatures.
Product Range
Specifications: ASTM A/ASME SA213/A249/A269/A312/A358 CL. I to V ASTM A789/A790
Sizes (Seamless): 1/2" NB - 24" NB
Sizes (ERW): 1/2" NB - 24" NB
Sizes (EFW): 6" NB - 100" NB
Wall Thickness available:
Schedule 5S - Schedule XXS (heavier on request)
Other Materials Testing:
NACE MR0175, H2 SERVICE, OXYGEN SERVICE, CRYO SERVICE, etc.
Dimensions:
All Pipes is manufactured and inspected/tested to the relevant standards including ASTM, ASME and API etc.
Background of 316L Stainless Steel Pipes and Tubes
Grade 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. It has excellent forming and welding characteristics. It is readily brake or roll formed into a variety of parts for applications in the industrial, architectural, and transportation fields. Grade 316 also has outstanding welding characteristics. Post-weld annealing is not required when welding thin sections.
Grade 316L, the low carbon version of 316 and is immune from sensitisation (grain boundary carbide precipitation). Thus it is extensively used in heavy gauge welded components (over about 6mm). Grade 316H, with its higher carbon content has application at elevated temperatures, as does stabilised grade 316Ti.
The austenitic structure also gives these grades excellent toughness, even down to cryogenic temperatures.
Composition of 316L Stainless Steel Pipes and Tubes
Table 1. Composition ranges for 316 grade of stainless steels.
| Grade |
|
C |
Mn |
Si |
P |
S |
Cr |
Mo |
Ni |
N |
| 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 |
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 |
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 |
- |
Mechanical Properties of 316L Stainless Steel Pipes and Tubes
Table 2. Mechanical properties of 316 grade stainless steels.
| Grade |
Tensile Str
(MPa) min |
Yield Str
0.2% Proof
(MPa) min |
Elong
(% in 50mm) 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 |
Note: 316H also has a requirement for a grain size of ASTM no. 7 or coarser.
Physical Properties of 316L Stainless Steel Pipes and Tubes
Table 3. Typical physical properties for 316 grade stainless steels.
| Grade |
Density
(kg/m3) |
Elastic Modulus
(GPa) |
Mean Co-eff of Thermal Expansion (m/m/0C) |
Thermal Conductivity
(W/m.K) |
Specific Heat 0-1000C
(J/kg.K) |
Elec Resistivity
(nΩ.m) |
| 0-1000C |
0-3150C |
0-5380C |
At 1000C |
At 5000C |
| 316/L/H |
8000 |
193 |
15.9 |
16.2 |
17.5 |
16.3 |
21.5 |
500 |
740 |
Grade Specification Comparison of 316L Stainless Steel Pipes and Tubes
Table 4. Grade specifications for 316 grade stainless steels.
| 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 |
- |
- |
- |
- |
- |
Note: These comparisons are approximate only. The list is intended as a comparison of functionally similar materials not as a schedule of contractual equivalents. If exact equivalents are needed original specifications must be consulted.
Corrosion Resistance of 316L Stainless Steel Pipes and Tubes
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 600C. Considered resistant to potable water with up to about 1000mg/L chlorides at ambient temperatures, reducing to about 500mg/L at 600C.
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 Treatment of 316L Stainless Steel Pipes and Tubes
Solution Treatment (Annealing) - Heat to 1010-11200C and cool rapidly. These grades cannot be hardened by thermal treatment.
- INCONEL Seamless Pipes and Tubes 600 gr.
- INCONEL Seamless Pipes and Tubes 601 gr.
- INCONEL Seamless Pipes and Tubes 617 gr
- INCONEL Seamless Pipes and Tubes 625 gr
- INCONEL Seamless Pipes and Tubes 718 gr
- INCONEL Seamless Pipes and Tubes 800 gr
- INCONEL Seamless Pipes and Tubes 800H gr
- INCONEL Seamless Pipes and Tubes 800HT GR
- INCONEL Seamless Pipes and Tubes 825 gr
- HASTELLOY Seamless Pipes and Tubes GR. C-22
- HASTELLOY Seamless Pipes and Tubes GR. C-276
- HASTELLOY Seamless Pipes and Tubes GR. B-2
- HASTELLOY Seamless Pipes and Tubes GR. X
- NICKEL Seamless Pipes and Tubes 200 gr.
- NICKEL Seamless Pipes and Tubes 201 gr.
- MONEL Seamless Pipes and Tubes 400 gr.
- MONEL Seamless Pipes and Tubes 405 gr.
- MONEL Seamless Pipes and Tubes K500 gr
- Stainless steel Seamless Pipes and Tubes 304 gr.
- Stainless steel Seamless Pipes and Tubes 304l gr.
- Stainless steel Seamless Pipes and Tubes 304H gr.
- Stainless steel Seamless Pipes and Tubes 316 gr.
- Stainless steel Seamless Pipes and Tubes 316l gr.
- Stainless steel Seamless Pipes and Tubes 904L gr.
- Stainless steel Seamless Pipes and Tubes 310 gr.
- Stainless steel Seamless Pipes and Tubes 321 gr.
- Stainless steel Seamless Pipes and Tubes 347 gr.
- Stainless steel Seamless Pipes and Tubes 347h gr.
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- ALLOY STEEL Seamless Pipes and Tubes ASTM A-335, GR P-5
- ALLOY STEEL Seamless Pipes and Tubes ASTM A-335, GR P-9
- ALLOY STEEL Seamless Pipes and Tubes ASTM A-335, GR P-11
- ALLOY STEEL Seamless Pipes and Tubes ASTM A-335, GR P-22
- ALLOY STEEL Seamless Pipes and Tubes ASTM A-335, GR P-91
- duplex steel 2507 gr. Seamless Pipes and Tubes
- CARBON STEEL Seamless Pipes and Tubes FITTINGS ASTM A-106, GR B
- CARBON STEEL Seamless Pipes and Tubes FITTINGS ASTM A-333, GR 6
- CARBON STEEL Seamless Pipes and Tubes FITTINGS ASTM A-53, GR B
- TITANIUM Seamless Pipes and Tubes IN GRADE OF 2
- TITANIUM Seamless Pipes and Tubes IN GRADE OF 5
- TiTANIUM Seamless Pipes and Tubes IN GRADE OF 7
- Duplex Steel S32760 gr. Seamless Pipes and Tubes
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