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Stainless Steel · Pipes · ASTM A312 / ASME SA312 TP347H

SS 347H Stainless Steel Pipes

In short: SS 347H pipe to ASTM A312 or A376 TP347H is the niobium-stabilised creep grade for main steam, hot reheat and refinery heater piping where stainless is specified.

S34709
UNS number
7.96
density, g/cm³
3.1 / 3.2
EN 10204 certificates
3
SS 347H product forms
Quote SS 347H pipes →Sizes and weights
SS 347H pipe weight by sizeCalculated at 7.96 g/cm³: ½" 1.29 kg/m; ¾" 1.71 kg/m; 1" 2.54 kg/m; 1¼" 3.44 kg/m; 1½" 4.10 kg/m; 2" 5.52 kg/m; 2½" 8.76 kg/m; 3" 11.45 kg/m; 4" 16.30 kg/m; 6" 28.66 kg/m; 8" 43.14 kg/m; 10" 61.15 kg/m; 12" 74.91 kg/m. SS 347H pipe weight by size7.96 g/cm³ ½": 1.29 kg/m½"¾": 1.71 kg/m¾"1": 2.54 kg/m1"1¼": 3.44 kg/m1¼"1½": 4.10 kg/m1½"2": 5.52 kg/m2"2½": 8.76 kg/m2½"3": 11.45 kg/m3"4": 16.30 kg/m4"6": 28.66 kg/m6"8": 43.14 kg/m8"10": 61.15 kg/m10"12": 74.91 kg/m12" 74.9 NPS, Sch 40S · kg/m
Calculated values for estimating; actual weights vary within tolerances.

Why this combination

Why SS 347H in pipes

High creep-rupture strengthNb-stabilised with controlled high carbonMain grade for superheater/reheater tubesFine-grain TP347HFG variant available to A213

Its carbon (0.04–0.10%), coarse grain and niobium give high creep-rupture strength and resistance to sensitisation, a combination valued in power and refinery piping.

Thick-section welds in SS 347H need care to avoid reheat cracking; follow the qualified procedure.

Specification

How to specify SS 347H pipes

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

SS 347H pipe cross-section, NPS 6 Sch 40S Engineering drawing showing outside diameter 168.28 mm and wall thickness 7.11 mm (ASTM A312 TP347H). Wall thickness is exaggerated for clarity. OD 168.28 mm WT 7.11 mm NPS 6SCH 40S ASTM A312 TP347H
SS 347H pipes: ASTM A312 / ASME SA312 TP347H (seamless & welded)
Specification
ASTM A312 / ASME SA312 TP347H (seamless & welded); A358 EFW
UNS
S34709
EN / W.Nr.
1.4961
Grade marking
TP347H
Heat treatment
Solution treated; grain size ASTM 7 or coarser

Sizes and weights

SS 347H pipes sizes, weighed at 7.96 g/cm³

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

SS 347H pipe: wall (mm) / weight (kg/m) at 7.96 g/cm³, ASME B36.19M
NPSOD mmSch 5SSch 10SSch 40SSch 80S
½"21.341.65 / 0.812.11 / 1.012.77 / 1.293.73 / 1.64
¾"26.671.65 / 1.032.11 / 1.302.87 / 1.713.91 / 2.23
1"33.401.65 / 1.312.77 / 2.123.38 / 2.544.55 / 3.28
1¼"42.161.65 / 1.672.77 / 2.733.56 / 3.444.85 / 4.53
1½"48.261.65 / 1.922.77 / 3.153.68 / 4.105.08 / 5.49
2"60.331.65 / 2.422.77 / 3.993.91 / 5.525.54 / 7.59
2½"73.032.11 / 3.743.05 / 5.345.16 / 8.767.01 / 11.57
3"88.902.11 / 4.583.05 / 6.555.49 / 11.457.62 / 15.49
4"114.302.11 / 5.923.05 / 8.496.02 / 16.308.56 / 22.63
6"168.282.77 / 11.463.40 / 14.027.11 / 28.6610.97 / 43.15
8"219.082.77 / 14.983.76 / 20.258.18 / 43.1412.70 / 65.54
10"273.053.40 / 22.934.19 / 28.179.27 / 61.1512.70 / 82.68
12"323.853.96 / 31.684.57 / 36.499.53 / 74.9112.70 / 98.82

Chemistry

SS 347H composition

UNS
S34709
EN / W.Nr.
1.4961 · X8CrNiNb16-13 (related)
Density
7.96 g/cm³
SS 347H Stainless Steel chemical composition, % (ASTM A240)
ElementLimit, %Why it matters
C0.04 – 0.10
Mn2.00 max
P0.045 max
S0.030 max
Si0.75 max
Cr17.0 – 19.0
Ni9.0 – 13.0
Nb8×C – 1.00

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
Main alloying elements of SS 347H Stainless Steel: bars show the permitted range (ASTM A240).

Questions

About SS 347H pipes

Where is SS 347H pipe used?

High-temperature steam and refinery lines in the creep range.

Is SS 347H pipe available to A376?

Yes, for central-station service.

From enquiry to dispatch

How a SS 347H 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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