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Alliages & Transformation is a registered trademark of Saint-Gobain SEVA.

The company makes and transforms superalloys, through its metallurgy laboratory, foundry and CNC machining equipment.

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Technical documentation:

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Our alloys

Alloys

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We can supply all types of steel (construction steel, tool steel, etc.), but we mainly produce stainless steels and nickel- or cobalt-based superalloys. Our alloys are used in various sectors :

  • Process industries (various industrial tools, furnaces, etc...).
  • Foodstuffs industries.
  • Chemical industry (pumps, special alloys).
  • Tools for the aerospace industry.
  • The energy sector (generator wheels, etc...).

Alloy grades table with a few of our equivalent grades :

Alloy grade

SEVA grade

AFNOR

EN

DIN

AISI

Martensitic alloy

SGS-X13

Z30 C13 - M

GX 30 Cr 13

1.4028

-

Austenitic alloy

SGS-R18-09

Z25 CNS 18-09-02 - M

GX 25 CrNiSi 18-09

1.4825

302

SGS-R25-20

Z15 CNS 25-20 - M

GX 15 CrNiSi 25-20

1.4841

310

Duplex alloy

SGS-X23-24

Z5 CND 27-05

-

1.4460

329

Superalloy

SGS-R26-52

Z45 NCW 45-25 - M

GX 45 NiCrW 48-28

2.4879

-

SGS-30-55

-

GX 70 NiCrW 55-30-7

-

-

SGS-75

ASTM A-494 GR CY5SnBiM

This list isn't exhaustive. Other alloys can be produced to order.

Note : Nickel- and cobalt-based superalloys are patented alloys developed by Saint-Gobain SEVA.
They are thus not shown in this table of standard grades.

Stainless and refractory steels

These include :

Martensitic steels

These have excellent mechanical properties.

SGS-X13 is a classic example of cast martensitic steel. It is used in the glass industry, for pump and valve parts in the foodstuffs industry, hydraulics, energy industry, etc.

Austenitic steels

These have remarkable resistance to hot oxidation and corrosion. The most used Saint-Gobain SEVA grades are SGS-R18-09 and SGS-R25-20. Their excellent hot mechanical properties allow these grades to be used for many applications in a broad range of sectors, such as tools and furnace equipment, cement works, petro-chemical plants, metallurgy or glass manufacturing.

Duplex steels

Duplex steels offer an excellent compromise between corrosion resistance and mechanical properties. To give an example, SGS-X23-24 alloy, with an austenitic-ferritic structure, resists corrosion at least as well as the usual grades of austenitic steels, and has significantly better mechanical properties and abrasion resistance, which means it can be used in the conversion industries, which involve severe chemical environments, mechanical loads and abrasion.

Superalloys

Nickel- or cobalt-based superalloys, with their excellent mechanical properties (notably resistance to both creeping and corrosion) are used in particularly severe environments, in high or very high temperatures, and under high mechanical and chemical stress. Their structure is austenitic and the matrix is strengthened in situ by phase or carbide precipitation, which retard separation under stress which causes plastic distortion in tools.

The SEVA foundry also produces SGS-75, a nickel and chrome alloy, with a secondary phase rich in bismuth and tin.

SGS-75 alloy (ASTM A-494 Grade CY5SnBi-M)

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The SGS-75 alloy is a stainless, anti-seizing / self-lubricating alloy, with a nickel-based matrix, in which a bismuth/tin binary alloy precipitates and acts as an integral lubricant. This alloy is widely used in the foodstuffs equipment sector. In cases of dry friction on stainless steel, and particularly for rotors and pistons in pumps and dosing machines, the use of this alloy significantly reduces the coefficient of friction and seizing loads.

 

The SEVA foundry works in close cooperation with a large network of university laboratories and industry research centres. In addition to the SEVA foundry's own skills, this support enables specific requirements to be met in terms of metallurgy and development, or certain alloy compositions to be modified.