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The alloys
We can provide you all kinds of steels (building steel, steel for tooling...) but we mainly elaborate stainless steels and nickel or cobalt-based superalloys. |
The main fields of application of the alloys we elaborate are among others : |
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The process industry(furnaces, various tools and particularly glass tools). |
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The food-processing industry. |
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The chemical industry(pumps, special alloys). |
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The transport industry. |
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Designations and equivalence of our alloys : |
Alloy family |
SEVA designations |
AFNOR equivalence |
EN equivalence |
DIN equivalence |
AISI equivalence |
Martensitic steel |
SGS-X13 |
Z30 C13 - M |
GX 30 Cr 13 |
1.4028 |
- |
Austenitic steel |
SGS-R18-09 |
Z25 CNS 18-09-02 - M |
GX 25 CrNiSi 18-09 |
1.4825 |
302 |
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SGS-R25-20 |
Z15 CNS 25-20 - M |
GX 15 CrNiSi 25-20 |
1.4841 |
310 |
Duplex steel |
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 |
- |
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SGS-75 |
ASTM A-494 GR CY5SnBiM |
This list is not exhaustive. Other alloys can be developed on demand.
Note : the nickel and cobalt-based superalloys are patented alloys developed by Saint-Gobain Seva. They do not appear in this table of normalized designations. Please consult us. |
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The stainless and refractory steels |
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The austenitic steels
They are outstanding steels because of their resistance to heat-oxidization and corrosion. Among the most common at Saint-Gobain Seva : SGS-R18-09 and SGS-R25-20 of which the good properties at heat enables to come up to numerous applications in very various fields such as tooling and furnace equipment, cement works, petro-
chemistry, metallurgy or glass industry. |
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The duplex steels
They provide a good compromise between resistance to corro- sion and mechanical properties. For instance, SGS-X23-24 (auste-
noferritic structure) enjoys a resistance to corrosion at least equiva-
lent to the common austenitic steels as well as mechanical properties and resistance to abrasion slightly superior.
These properties enables to use it in transformation industry where chemical, mechanical and abrasive stresses are quite harsh. |
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The martensitic steels
They are distinguished by very high mechanical properties.
SGS-X13 is a standard example of moulded martensitic steel which is used in the glass industry, for parts of pumps and gates in the food-processing industry, in hydraulics, energy... |
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Among these steels, there are : |
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The martensitic steels. |
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The austenitic steels. |
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The duplex steels. |
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The superalloys |
The nickel or cobalt-based superalloys with very high mechanical properties (particularly creep resistance and resistance to corrosion) are used in very agressive conditions at high, even very high, temperature and with strong mechanical and chemical stresses. Their structure is austenitic and the matrix is in-situ reinforced by precipitation of phases or carbides which enables to slow down the movement of dismantling under stress, at the origin of the plastic bending of tooling.
We produce several hundreds of tons a year of nickel-based or cobalt-based superalloys, particularly for the glass industry. In collaboration with university partners and the laboratories of the Saint-Gobain Group, we developed a cobalt-based alloy of which use can be envisaged till 1,200°C.
We produce as well SGS-75, an alloy based on nickel and chromium, with a secondary phase rich in bismuth and tin. |
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The SGS-75 alloy (naming CY5SnBi-M) |
The SGS-75 alloy is an antigalling/self-lubricating alloy with a nickel-based matrix in which one a binary bismuth/tin alloy (playing the role of an integrated lubricant) is precipitated. Its content in chromium enables to use it in the food-processing industry. |
It is used in case of close contact on stainless steel and more particularly for rotors and pistons which will equip pumps and mixture machines. The use of this alloy enables to decrease significantly the friction coefficient and the galling stress. |
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We work in close collaboration with a large network of university laboratories and industrial research centres. Besides our own skill, this collaboration enables us to come up to specific needs and expectations in metallurgy and to develop or improve some steel compositions.
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