Alloy SGS-37-18

Austenitic refractory steel SGS-37-18
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Descriptions

The SGS-37-18 refractory alloy shows an excellent oxidation resistance at high temperatures.

Designations

SEVA designation : SGS-37-18

Standard designation:
AFNOR Z12NCS37.18
EN GX40NiCrSiNb38-19
DIN 1.4849

Chemical analysis

C : 0.3-0.5
Ni : 36-39
Cr : 18-21
Nb : 1.2-1.8
Si : 0.75-2.5
Mn : ≤ 2
Fe : Bal

Mechanical properties

Hardness: 150-190 HB

Tensile tests at room temperature:

Rp0,2 (MPa) Rm (MPa) A (%)
230 430 6

Young's modulus at 20°C : E = 200 GPa

Hot tensile tests:

Temperature (°C) 870°C
Rp0,2 (en Mpa) 90-100
Rm (en Mpa) 145-160
A(%) 30-40

Creep resistance

Temperature 925°C
Creep strength in MPa causing rupture for a duration of 1000h: 24 Mpa
Stress causing an elongation of 1% after 1000 h: 19 Mpa

Applications

Areas of use:

• Aircraft industry
• Industries

Maximum temperature of use:

900°C-1000°C

Types of parts produced:

• Tools for shaping titanium sheets by Super-Plastic
Forming (SPF) process
• Tools or industrial parts working at high temperatures

Standard structure

Austenitic matrix reinforced by precipitation of carbides.

Physical properties

Density at 20°C: 8.0 g/cm³

Approximate melting range: 1340-1390°C

Expansion coefficient α in 10-6 /°C :

Temperature (°C) α (10-6/°C)
300 15.23
400 15.68
500 16.1
600 16.53
700 16.94
800 17.38
850 17.58
900 17.86
950 18.07

Other properties

Magnetism : non-magnetic

Thermal conductivity λ W.m-1.K-1 at:

Temperature (°C) λ W.m-1.K-1
20 12

Heat capacity at 20°C : 500 J.kg-1.K-1

Production

SEVA produces the SGS-37-18 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: 60 to 90 m/min
Polishing ●●●●○  
Hot isostatic pressing (HIP) ●●●●○  
Forging ●●●●○  
Welding ●●○○○  

Documentation

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Product datasheet
Product picture
Fiche technique SGS-37-18
Others