These special steels have improved mechanical properties and better workability which are essential for special applications in aerospace, power generation, nuclear, defence, cryogenic and other general engineering industries. These include precipitation hardening steels, non-magnetic austenitic and martensitic stainless steels and above all maraging steels.
| GRADE UNS. NO. |
UNS. NO. |
CONFORMITY TO INTERNATIONAL SPECN. |
KNOWN EQUIVALENT |
MAX SERVICE TEMP °C |
MDN 174 |
S 17400 |
ASTM A564-TYPE 630 |
Alloy 17-4 PH |
315 |
MDN 250 |
K92890 |
ASTM A538/A 579 |
Maraging 250 |
400 |
MDN 904L |
N 08904 |
ASTM B 625, B 649 |
AVESTA 904 L |
- |
GRADE PRINCIPAL CHARACTERISTICS APPLICATIONS |
MDN 174 |
A precipitation hardening steel offering good corrosion resistance with high strength and hardness Used in application demanding high corrosion resistance upto 300 °C |
Nuclear power plants, nozzles for nylon fiber compressor parts |
MDN 904L |
Used under severe corrissive conditions |
Distillation columns, reaction vessels, pipes and tanks |
MDN 250 |
High strength and toughness for service at cryogenic and ambient temperatures |
Components for rockets, missiles and aircrafts, hot forgings, dies, extrusion tooling etc. |
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