Alloy SGS-625

Superalloy with excellent high-temperature characteristics and good toughness at very low temperatures.
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Descriptions

The SGS-625 has excellent high temperature properties (creep, oxidation and corrosion resistance), good toughness at very low temperatures and high tensile strength.
Excellent pitting resistance in marine environment.

Designations

SEVA designation: SGS-625

Standard designation:
AFNOR NC 22 Dnb
EN NiCr22Mo9Nb
DIN 2,4856
USA (AISI) N06625 (ASTM B 446)

Chemical analysis

C : 0.1
Cr : 20-23
Mo : 8-10
Nb : 3.15-4.15
Fe : <5
Mn : <0.5
Si : <0.5
P : <0.015
S : < 0.015
Al : <0.4
Ni : Bal.

Mechanical properties

Hardness: 180-250 HB

Tensile tests at room temperature:

Rp0,2 (MPa) Rm (MPa) A (%)
300-400 550-700 20-40

 

Young's modulus at 20°C : E = 200 GPa
 

Temperature 200 300 400 500
Rp0,2 (MPa) 420 410 380 310

 

Applications

Areas of use:

• Aircraft industry
• Shipbuilding
• Petrochemicals
• Cryogenics
• Nuclear industry
• Industrial application at high temperature

Maximum temperature of use:

1000°C

Types of parts produced:

Various foundry parts

Standard structure

Austenitic nickel matrix reinforced with Nb and Cr.

Physical properties

Density at 20°C : 8.4g/cm³

Approximate melting range: 1290-1350°C

Expansion coefficient α in 10-6 /°C :
 

Temperature (°C) α (10-6/°C)
93 12.8μm/m.°C

Other properties

Magnetism: paramagnetic

Thermal conductivity at 20°C : 9.8 λ W.m-1.K-1

Specific heat capacity at 20°C : 0.41 Cp en J.g-1.°C-1

Thermal conductivity λ in W.K-1.m-1
at different temperatures:
 

Temp.  - 157°C 21°C 38°C 93°C 204°C 316°C
λ 7.2 9.8 10.1 10.8 12.5 14.1

 

Temp. 427°C 538°C 649°C 760°C 871°C 982°C
λ 15.5 17.5 19 20.8 22.8 25.2

 

 

Production

SEVA produces the SGS-625 alloy in an electric induction furnace under an argon gas protective atmosphere.
Cast in a sand mold.

Compatible processes

  Compatibility Remarks
Machining ●●●○○ Cutting speed recommended: 30 to 50 m/min
Polishing ●●●○○  
Hot isostatic pressing (HIP) ●●●●●  
Forging ●●●●○  
Welding ●●○○○ Electrode or TIG.

Documentation

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Product datasheet
Product picture
Alliage SGS-30-55
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