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Stainless Steel · Pipes · ASTM A312 / ASME SA312 TP316

SS 316 Stainless Steel Pipes

In short: SS 316 pipe to ASTM A312 TP316 adds 2–3% molybdenum to the 18-8 base, giving better resistance to chlorides and many chemicals than SS 304. It is used for chemical, marine, pharmaceutical and food piping, usually dual-certified SS 316/316L.

S31600
UNS number
8
density, g/cm³
3.1 / 3.2
EN 10204 certificates
7
SS 316 product forms
Quote SS 316 pipes →Sizes and weights
SS 316 pipe weight by sizeCalculated at 8 g/cm³: ½" 1.29 kg/m; ¾" 1.72 kg/m; 1" 2.55 kg/m; 1¼" 3.45 kg/m; 1½" 4.12 kg/m; 2" 5.54 kg/m; 2½" 8.80 kg/m; 3" 11.51 kg/m; 4" 16.38 kg/m; 6" 28.80 kg/m; 8" 43.36 kg/m; 10" 61.46 kg/m; 12" 75.28 kg/m. SS 316 pipe weight by size8 g/cm³ ½": 1.29 kg/m½"¾": 1.72 kg/m¾"1": 2.55 kg/m1"1¼": 3.45 kg/m1¼"1½": 4.12 kg/m1½"2": 5.54 kg/m2"2½": 8.80 kg/m2½"3": 11.51 kg/m3"4": 16.38 kg/m4"6": 28.80 kg/m6"8": 43.36 kg/m8"10": 61.46 kg/m10"12": 75.28 kg/m12" 75.3 NPS, Sch 40S · kg/m
Calculated values for estimating; actual weights vary within tolerances.

Why this combination

When SS 316 pipe earns its premium over SS 304

2–3% molybdenum for chloride pitting resistancePREN about 23–25 against 18–20 for 304Non-magnetic when annealedWidely available in every product form

Molybdenum is the difference: it raises pitting resistance (PREN about 23–25 against 18–20 for SS 304), which matters wherever chlorides, salt air or chloride-bearing process streams are present.

Plain SS 316 has the higher strength of the pair; SS 316L the lower carbon for welding. Ordering dual SS 316/316L pipe gives both and is the usual stock practice.

Specification

How to specify SS 316 pipes

NPS ⅛" to 48" and larger (DN 6 – DN 1200+), schedules 5S to XXS, single random, double random and cut lengths

SS 316 pipe cross-section, NPS 6 Sch 40S Engineering drawing showing outside diameter 168.28 mm and wall thickness 7.11 mm (ASTM A312 TP316). Wall thickness is exaggerated for clarity. OD 168.28 mm WT 7.11 mm NPS 6SCH 40S ASTM A312 TP316
SS 316 pipes: ASTM A312 / ASME SA312 TP316 (seamless & welded)
Specification
ASTM A312 / ASME SA312 TP316 (seamless & welded); A358 EFW
UNS
S31600
EN / W.Nr.
1.4401
Grade marking
TP316, commonly dual TP316/TP316L
Dimensions
ASME B36.19M 5S–80S

Sizes and weights

SS 316 pipes sizes, weighed at 8 g/cm³

Other sizes on request. For general pipes information, such as manufacturing routes and end finishes, see the pipes guide.

SS 316 pipe: wall (mm) / weight (kg/m) at 8 g/cm³, ASME B36.19M
NPSOD mmSch 5SSch 10SSch 40SSch 80S
½"21.341.65 / 0.822.11 / 1.022.77 / 1.293.73 / 1.65
¾"26.671.65 / 1.042.11 / 1.302.87 / 1.723.91 / 2.24
1"33.401.65 / 1.322.77 / 2.133.38 / 2.554.55 / 3.30
1¼"42.161.65 / 1.682.77 / 2.743.56 / 3.454.85 / 4.55
1½"48.261.65 / 1.932.77 / 3.173.68 / 4.125.08 / 5.51
2"60.331.65 / 2.432.77 / 4.013.91 / 5.545.54 / 7.63
2½"73.032.11 / 3.763.05 / 5.365.16 / 8.807.01 / 11.63
3"88.902.11 / 4.603.05 / 6.585.49 / 11.517.62 / 15.57
4"114.302.11 / 5.953.05 / 8.536.02 / 16.388.56 / 22.75
6"168.282.77 / 11.523.40 / 14.097.11 / 28.8010.97 / 43.37
8"219.082.77 / 15.063.76 / 20.358.18 / 43.3612.70 / 65.87
10"273.053.40 / 23.044.19 / 28.319.27 / 61.4612.70 / 83.10
12"323.853.96 / 31.844.57 / 36.679.53 / 75.2812.70 / 99.31

Chemistry

SS 316 composition

UNS
S31600
EN / W.Nr.
1.4401 · X5CrNiMo17-12-2
Density
8 g/cm³
PREN
23 – 25
SS 316 Stainless Steel chemical composition, % (ASTM A240)
ElementLimit, %Why it matters
C0.08 max
Mn2.00 max
P0.045 max
S0.030 max
Si0.75 max
Cr16.0 – 18.0
Ni10.0 – 14.0
Mo2.00 – 3.00
N0.10 max

Limits per ASTM A240; other product forms and specifications differ slightly. Your order's specification and edition govern.

0%5%10%15%20% Mn Cr Ni Mo
Main alloying elements of SS 316 Stainless Steel: bars show the permitted range (ASTM A240).

Questions

About SS 316 pipes

Is SS 316 pipe suitable for seawater?

Only for short exposure or non-critical use. Warm seawater pits SS 316; super duplex, 6Mo or CuNi are used for seawater systems.

Is SS 316 pipe used at high temperature?

Yes, within code limits. For creep-range service, SS 316H is specified.

From enquiry to dispatch

How a SS 316 pipes order runs

  1. 01 EnquiryGrade, specification, size, quantity
  2. 02 ReviewChecked against your standard
  3. 03 InspectPMI, dimensions, TPI if required
  4. 04 CertifyEN 10204 3.1 / 3.2, heat traceable
  5. 05 ShipPacked and documented for the destination

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