NYB66
Spécifications
Composition
Applications
• Various mechanical and fabricated components operating in corrosive environments: sea water, chlorinated media, acid gases (H2S).
• The grade is specifically used in:
– offshore oil production industry (ASTM A182 Grade F58).
– marine industry.
– paper pulp industry.
– chemical industry.
Characteristics
• Super austenitic stainless steel with excellent corrosion resistance either general or localised (pitting, crevice) particularly in oxidant atmosphere with high chloride content:
Suitable for the test ASTM G48:
CPT > 95°C – CCT = 70°C
• Excellent crevice corrosion resistance in sea water atmosphere.
• Excellent stress corrosion resistance in H2S environment.
• The crevice corrosion resistance of steel NYB66 is significantly better than that of Ni-base alloy 625 and conventional super austenitic steels.
Mechanical properties
| Heat treatment |
UTS (N/mm²) |
0,2% YS (N/mm²) |
A (%) |
|---|---|---|---|
| H | > 800 | > 420 | > 50 |
Key to heat treatment symbols
| Solution treated | H | Annealed | R |
|---|---|---|---|
| Thermo-mechanical treatment | TM | Quenched and tempered | T+RV |
| Sub-zero treatment | F | Solution treated and aged | H+V |