| Martensitic |
It
is straight chromium type of stainless, containing
Chromium as
main alloying element.
It is normally Hard and Brittle, includes 4% - 10% Chromium types and is Air Hardening, and Magnetic. Preheat and Post heat is necessary when welding. |
| Ferritic |
straight
Chromium type.
Normally is Soft and Ductile. Includes the 12% - 28% Chromium types.
It is Magnetic. Preheat and Post heat is necessary when welding. |
| Austenitic |
It
is Chromium-Nickel type.
Nickel content usually ranges from 7% - 35% with 8% - 10% being the most
predominantly used.
It is Strong, Ductile and Impact Resistant.
Non-magnetic in the annealed condition, but slightly magnetic when cold worked.
No preheat or Post heat is necessary when welding. |
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| How Heat
affects Stainless Steel |
| Heat and Corrosion Resistance |
- Carbide precipitation causes the stainless steel to loose its corrosion resisting properties in
the areas affected.
- Martensitic Stainless Steels are considered stable over the entire temperature range.
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| Heat
and Grain growth |
- Martensitic SS are affected by grain growth of the individual crystals when subjected to elevated welding or forging temperatures. This grain growth causes the metal to become brittle.
- Small crystals can be restored by heat treatments to improve ductility
- Pre-heats and post-heats are used to slow down the cooling to avoid excessive hardening and to prevent cracking.
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Material selection
Recently, it is known as a science and is the most important item for reverse engineering
SESCO
basis for material selection as follows : |
Latest software for steel materials and applications
Experience in heat treatment
International Technical support ( USA , Canada and UK) |
Inspection System |
| SESCO implements inspection system to achieve the following |
Correct Heat Treatment
Required Tempering
High measurements accuracy Geometrical Tolerance
Good Surface finish |
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Life
Time
Improve
Performance |
We always submit samples prior to any production run, to insure customer satisfaction.
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We
look forward to working with you! |
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