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Stainless Steel · Pipes · ASTM A312 / ASME SA312 TP316L

SS 316L Stainless Steel Pipes

In short: SS 316L pipe to ASTM A312 TP316L is the most specified stainless pipe for chemical, pharmaceutical, food, marine and offshore utility service: 2–3% molybdenum for chloride resistance and 0.030% max carbon so welds stay sound.

S31603
UNS number
8
density, g/cm³
3.1 / 3.2
EN 10204 certificates
7
SS 316L product forms
Quote SS 316L pipes →Sizes and weights
SS 316L 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 316L 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

Why SS 316L is the default process pipe

Carbon 0.030% max for weld-zone corrosion resistance2–3% molybdenum for chloride pitting resistanceCommonly dual-certified SS 316/316LDefault choice for welded pharma, chemical and marine equipment

SS 316L combines the two things most process piping needs: molybdenum for pitting resistance in chlorides and acids, and low carbon so hundreds of welds do not sensitise. That combination covers a very wide range of service at moderate cost.

Its limits are clear: warm seawater and strong chlorides pit it, and it is not a creep-range material. Those cases go to duplex, super duplex or SS 316H. See why SS 316L pipe fails in seawater on our blog.

Specification

How to specify SS 316L pipes

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

SS 316L pipe cross-section, NPS 6 Sch 40S Engineering drawing showing outside diameter 168.28 mm and wall thickness 7.11 mm (ASTM A312 TP316L). Wall thickness is exaggerated for clarity. OD 168.28 mm WT 7.11 mm NPS 6SCH 40S ASTM A312 TP316L
SS 316L pipes: ASTM A312 / ASME SA312 TP316L (seamless & welded)
Specification
ASTM A312 / ASME SA312 TP316L (seamless & welded); A358 EFW
UNS
S31603
EN / W.Nr.
1.4404
Grade marking
TP316L, commonly dual TP316/TP316L
Dimensions
ASME B36.19M 5S–80S; B36.10M for heavier walls

Sizes and weights

SS 316L 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 316L 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 316L composition

UNS
S31603
EN / W.Nr.
1.4404 · X2CrNiMo17-12-2
Density
8 g/cm³
PREN
23 – 25
SS 316L Stainless Steel chemical composition, % (ASTM A240)
ElementLimit, %Why it matters
C0.030 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 316L Stainless Steel: bars show the permitted range (ASTM A240).

Questions

About SS 316L pipes

Why is SS 316L pipe preferred over SS 316?

Low carbon prevents sensitisation in weld zones, so welded systems resist intergranular corrosion without heat treatment.

Can SS 316L pipe be used offshore?

For utility and instrument service, yes; seawater lines generally need super duplex, 6Mo or CuNi.

From enquiry to dispatch

How a SS 316L 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

Need SS 316L pipes?

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