MATERIAL DESCRIPTION

Alloy 625 is a nickel-chromium-molybdenum alloy with additional of niobium. This provides a high strength alloy without a strengthening heat treatment. The alloy is especially resistant to pitting and crevice corrosion but also other severely corrosive environments. Service temperatures range from cryogenic to about 1000°C. High tensile, creep, and rupture strength together with outstanding fatigue and thermal-fatigue strength in addition to oxidation resistance and excellent weldability are characteristics of this alloy.

Applications

Alloy 625 is used in oil gas industry, marine engineering, chemical processing and pollution control equipment.

Heat Treatment

Annealing at minimum 871°C and water quench.

Weldability

Very good.

Chemical Composition

Weight % C Mn P S Si Cr Ni Mo Nb+Ta Co Fe Al Ti
Min.            20,0  58,0  8,0  3,15        
Max.  0,10  0,50  0,015  0,015  0,50  23,0    10,0  4,15  1,00  5,00  0,40  0,40

Reference Standards

 

General:

  • PED 2014/68/EU Annex I section 4.3
  • NACE MR0175/ISO 15156-3 and NACE MR0103/ISO 17945

Bars:

  • ASTM B446, ASTM B564, Norsok M-630 MDS N17

Mechanical Properties (Specific for Bars)

Dimension (mm)

 Yield strength
Rp0.2,
MPa		 Tensile strength Rm,
MPa		 Elongation
[%]		 Hardness
[HB]		 Impact Charpy-V, -60ºC
[J]
 ≤ 102  ≤ 414  ≥ 827  ≥ 30  ≤ 321  ≥ 68
 ≤ 254  ≤ 345  ≥ 758  ≥ 30  ≤ 321  ≥ 68
 > 254  ≥ 345  ≥ 758  ≥ 30  ≤ 321  ≥ 42

Round Bar Stock

DIA KG/M
12,7 mm 1,1
17 mm 2,
20 mm 2,8
25,4 mm 4,5
32 mm 6,8
38 mm 9,9
45 mm 13,8
52 mm 18,3
57 mm 22,1
61 mm 24,8
66 mm 29,
71 mm 34,5
76,2 mm 39,5
81 mm 44,7
87 mm 51,5
91 mm 56,4
102 mm 71,3
DIA KG/M
107 mm 77,9
113 mm 86,8
120 mm 97,6
128 mm 111,4
135 mm 124,
142 mm 137,5
152 mm 158
165 mm 186
180 mm 221
185 mm 233
203 mm 281
230 mm 360
254 mm 439
280 mm 533
300 mm 613
350 mm 833

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Equivalent Standards

  • EN 2.4856
  • UNS N06625
  • Alloy 625
Tags: Round Bar & Bored Bar