NYB66 Austenitic stainless steels

Spécifications

EU
X1CrNiMoWN24-22-6
USA
UNS:S31266

Typical composition

C
< 0.03
Ni
22
Cr
24
Mo
5,5
N
0,5
W
2

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.

Mechanical properties

• 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 features

Heat treatment
H
UTS (N/mm²)
> 800
A (%)
> 50

Solution treated : H
Annealed : R
Thermo-mechanical treatment : TM
Quenched and tempered : T+RV
Sub-zero treatment : F
Solution treated and aged : T+RV

NYB66_FR

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