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Ultra 254 SMO EN 1.4547, ASTM UNS S31254
Sandvik 254 SMO is a high-alloy austenitic stainless steel developed for use in seawater and other aggressive chloride-bearing media. The steel is characterized by the following properties:
*The PRE is defined as, in weight-%, PRE = %Cr + 3.3 x %Mo + 16 x %N
* Obsolete. Replaced by EN.
** Nearest equivalent grade.
The following figures apply to solution annealed condition seamless tube and pipe.
Wall thickness | Proof strength | Tensile strength | Elong. | Hardness | ||
---|---|---|---|---|---|---|
Rp0.2a) | Rp1.0a) | Rm | Ab) | A2" | HRB | |
mm | MPa | MPa | MPa | % | % | |
<5 | ≥310 | ≥340 | 675-850 | ≥35 | ≥35 | ≤96 |
>5 | ≥310 | ≥340 | 655-850 | ≥35 | ≥35 | ≤96 |
1 MPa = 1 N/mm2
Wall thickness | Proof strength | Tensile strength | Elong. | Hardness | ||
---|---|---|---|---|---|---|
Rp0.2a) | Rp1.0a) | Rm | Ab) | A2" | HRB | |
inch | ksi | ksi | ksi | % | % | |
<0.187 | ≥45 | ≥49 | 98-123 | ≥35 | ≥35 | ≤96 |
>0.187 | ≥45 | ≥49 | 98-123 | ≥35 | ≥35 | ≤96 |
a) Rp0.2 and Rp1.0 correspond to 0.2% offset and 1.0% offset yield strength, respectively.
b) Based on L0 = 5.65 √S0 where L0 is the original gauge length and S0 the original cross-section area.
Due to its austenitic microstructure, Sandvik 254 SMO has very good impact strength both at room temperature and at cryogenic temperatures.
Tests have demonstrated that the steel fulfils the requirements (60 J (44 ft-lb) at -196 oC (-320 oF)) according to the European standards EN 13445-2 (UFPV-2) and EN 10216-5.
Intermetallic phases are precipitated within the temperature range of 600–1000°C (1110–1830°F). Therefore, the steel should not be exposed to these temperatures for prolonged periods.
Temperature
|
Proof strength
|
|
---|---|---|
°C | Rp0.2 | Rp1.0 |
MPa | MPa | |
min. | min. | |
100 | 230 | 270 |
200 | 190 | 225 |
300 | 170 | 200 |
400
|
160
|
190
|
500 | 148 | 180 |
Temperature
|
Proof strength
|
|
---|---|---|
°F | Rp0.2 | Rp1.0 |
ksi | ksi | |
min. | min. | |
200 | 34 | 40 |
400 | 27 | 32 |
600 | 24 | 29 |
700
|
24
|
28
|
900 | 22 | 26 |