SMO UNS S31254 Seamless Welded Pipe
Specifications : ASTM A 409 ASME SA 409 / ASTM A 312 ASME SA 312 / ASTM A 358 ASME SA 358
Dimensions : ASTM, ASME and API
Size : 3/4″ – 12″
Specialized in : Large Diameter Size
Thickness : 20 Swg., 18 Swg., 16 Swg., 14 Swg., 12 Swg., 10 Swg., & Sch. 10, Sch. 40, Sch. 80 etc.
Type : Seamless / ERW / Welded / Fabricated
Form : Round, Hydraulic Etc
Length : Single Random, Double Random & Cut Length.
End : Plain End, Beveled End, Treaded
CHEMICAL COMPOSITION:
| C | Si | Mn | P | S | Cr | Ni | Mo | N | Cu |
|---|---|---|---|---|---|---|---|---|---|
| ≤0.020 | ≤0.80 | ≤1.00 | ≤0.030 | ≤0.010 | 20 | 18 | 6.1 | 0.20 | 0.7 |
MECHANICAL PROPERTIES:
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.
Impact strength
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.
At high temperatures
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 |
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