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Nickel Alloys · Pipes · ASTM B444

Inconel 625 Pipes

In short: Inconel 625 pipe to ASTM B444 (seamless) or B705 (welded) is used for seawater, sour-gas, chemical and high-temperature piping where strength and pitting resistance must come together.

N06625
UNS number
8.44
density, g/cm³
3.1 / 3.2
EN 10204 certificates
6
Inconel 625 product forms
Quote Inconel 625 pipes →Sizes and weights
Inconel 625 pipe weight by sizeCalculated at 8.44 g/cm³: ½" 1.36 kg/m; ¾" 1.81 kg/m; 1" 2.69 kg/m; 1¼" 3.64 kg/m; 1½" 4.35 kg/m; 2" 5.85 kg/m; 2½" 9.29 kg/m; 3" 12.14 kg/m; 4" 17.28 kg/m; 6" 30.38 kg/m; 8" 45.74 kg/m; 10" 64.84 kg/m; 12" 79.43 kg/m. Inconel 625 pipe weight by size8.44 g/cm³ ½": 1.36 kg/m½"¾": 1.81 kg/m¾"1": 2.69 kg/m1"1¼": 3.64 kg/m1¼"1½": 4.35 kg/m1½"2": 5.85 kg/m2"2½": 9.29 kg/m2½"3": 12.14 kg/m3"4": 17.28 kg/m4"6": 30.38 kg/m6"8": 45.74 kg/m8"10": 64.84 kg/m10"12": 79.43 kg/m12" 79.4 NPS, Sch 40S · kg/m
Calculated values for estimating; actual weights vary within tolerances.

Why this combination

Why 625 pipe goes into the hardest lines

High strength without age hardeningPREN > 50: excellent pitting and crevice resistanceImmune to chloride SCCGrade 1 (annealed) and Grade 2 (solution-annealed) conditions

Offshore and sour-gas lines combine chlorides, H₂S and pressure. 625 resists pitting, crevice corrosion and chloride stress corrosion cracking while keeping high strength without ageing.

Specify Grade 1 (annealed) for corrosion service up to about 600 °C, Grade 2 (solution annealed) for higher-temperature creep service.

Specification

How to specify Inconel 625 pipes

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

Inconel 625 pipe cross-section, NPS 6 Sch 40S Engineering drawing showing outside diameter 168.28 mm and wall thickness 7.11 mm (ASTM B444 Inconel 625). Wall thickness is exaggerated for clarity. OD 168.28 mm WT 7.11 mm NPS 6SCH 40S ASTM B444 Inconel 625
Inconel 625 pipes: ASTM B444 (seamless) / B705 (welded)
Specification
ASTM B444 (seamless) / B705 (welded)
UNS
N06625
EN / W.Nr.
2.4856
Designation
UNS N06625 / W.Nr. 2.4856
Grade
Grade 1 or Grade 2

Sizes and weights

Inconel 625 pipes sizes, weighed at 8.44 g/cm³

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

Inconel 625 pipe: wall (mm) / weight (kg/m) at 8.44 g/cm³, ASME B36.19M
NPSOD mmSch 5SSch 10SSch 40SSch 80S
½"21.341.65 / 0.862.11 / 1.082.77 / 1.363.73 / 1.74
¾"26.671.65 / 1.092.11 / 1.372.87 / 1.813.91 / 2.36
1"33.401.65 / 1.392.77 / 2.253.38 / 2.694.55 / 3.48
1¼"42.161.65 / 1.772.77 / 2.893.56 / 3.644.85 / 4.80
1½"48.261.65 / 2.042.77 / 3.343.68 / 4.355.08 / 5.82
2"60.331.65 / 2.572.77 / 4.233.91 / 5.855.54 / 8.05
2½"73.032.11 / 3.973.05 / 5.665.16 / 9.297.01 / 12.27
3"88.902.11 / 4.863.05 / 6.945.49 / 12.147.62 / 16.42
4"114.302.11 / 6.283.05 / 9.006.02 / 17.288.56 / 24.00
6"168.282.77 / 12.163.40 / 14.867.11 / 30.3810.97 / 45.76
8"219.082.77 / 15.893.76 / 21.478.18 / 45.7412.70 / 69.50
10"273.053.40 / 24.314.19 / 29.879.27 / 64.8412.70 / 87.67
12"323.853.96 / 33.594.57 / 38.699.53 / 79.4312.70 / 104.78

Chemistry

Inconel 625 composition

UNS
N06625
EN / W.Nr.
2.4856 · NiCr22Mo9Nb
Density
8.44 g/cm³
PREN
≈ 51
Inconel 625 chemical composition, % (ASTM B443)
ElementLimit, %Why it matters
Ni58.0 min
Cr20.0 – 23.0
Mo8.0 – 10.0
Nb + Ta3.15 – 4.15
Fe5.0 max
C0.10 max
Mn0.50 max
Si0.50 max
Al0.40 max
Ti0.40 max
Co1.0 max

Limits per ASTM B443; other product forms and specifications differ slightly. Your order's specification and edition govern.

0%10%20%30%40%50%60% Ni Cr Mo Co
Main alloying elements of Inconel 625: bars show the permitted range (ASTM B443).

Questions

About Inconel 625 pipes

Grade 1 or Grade 2 625 pipe?

Grade 1 for most corrosion service; Grade 2 for high-temperature creep service.

Is 625 pipe NACE compliant?

It is listed in NACE MR0175 / ISO 15156 within stated limits.

From enquiry to dispatch

How a Inconel 625 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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