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316l stainless steel tubing suppliers

316l seamless pipe manufacturers in India, 316l welded pipe exporter in India, ss 316l Square Tube distributor in Mumbai

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316L Stainless Steel Seamless Pipes & Tubes Grades

316L Stainless Steel Seamless Pipes & Tubes

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. 

 

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 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
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

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
316L 485 170 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 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
316L S31603 316S11 - 1.4404 X2CrNiMo17-12-2 2348 SUS 316L

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.