Sandvik 8R40 (Billets)
Datasheet updated 2013-03-22 15:45:40 (supersedes all previous editions)
Sandvik 8R40 is an austenitic, niobium-stabilized stainless chromium-nickel steel for use at temperatures up to 850°C (1560°F).
Standards
- ASTM 347, 347H
- UNS S34700, S34709
- EN number 1.4550
- EN name X6CrNiMo18-10
- W.Nr. 1.4550
- SS 2338
Product standards
- EN 10088-3
- ASTM A-314
Suitable for production of flanges etc. according to ASTM A-182 Grade F347/347H.
Certificates
Status according to EN 10 204 3.1
Chemical composition (nominal) %
| C |
Si | Mn | P max |
S max |
Cr | Ni | Mo | Others |
|---|---|---|---|---|---|---|---|---|
| 0.06 | 0.6 | 1.7 | 0.030 | 0.015 | 17.5 | 11 | - | Nb>10xC |
Forms of supply
Sizes and tolerances
Round-cornered square, as well as round billets, are produced in a wide range of sizes according to the following tables. Larger sizes offered on request.
Surface conditions
Square billets
Unground, spot ground or fully ground condition.
Round billets
Peel turned or black condition.
| Size | Tolerance | Length |
|---|---|---|
| mm | mm | m |
| 80 | +/-2 | 4 - 6.3 |
| 100, 114, 126, 140, 150 | +/-3 | 4 - 6.3 |
| 160, 180, 195, 200 | +/-4 | 4 - 6.3 |
| >200 - 350 | +/-5 | 3 - 5.3 |
Sizes and tolerances apply to the rolled/forged condition.
| Size | Tolerance | Length |
|---|---|---|
| mm | mm | m |
| 75 - 200 (5 mm interval) | +/-1 | max 10 |
| >200 - 450 | +/-3 | 3 - 8 |
| Size | Tolerance | Length |
|---|---|---|
| mm | mm | m |
| 77 - 112 (5 mm interval) | +/-2 | max 10 |
| 124, 134 | +/-2 | max 10 |
| 127, 147, 157 | +/-2 | max 10 |
| 142, 152, 163 | +/-2 | max 10 |
| 168, 178, 188 | +/-2 | max 10 |
| 183, 193 | +/-2 | max 10 |
Other products
- Hollow bar
- Welding wire
- Covered electrodes
Mechanical properties
Testing is performed on separately solution annealed and quenched test piece. The following figures apply to material in the solution annealed and quenched condition.
At 20°C (68°F)
| Proof strength | Tensile strength | Elong. | Contr. | HB | |
|---|---|---|---|---|---|
| Rp0.2a) | Rp1.0 a) | Rm | Ab) | Z | |
| MPa | MPa | MPa | % | % | |
| min | min | min | min | max | |
| 210 | 245 | 515-700 | 40 | 50 | 215 |
| Proof strength | Tensile strength | Elong. | Contr. | HB | |
|---|---|---|---|---|---|
| Rp0.2a) | Rp1.0 a) | Rm | Ab) | Z | |
| MPa | MPa | MPa | % | % | |
| min | min | min | min | max | |
| 30.5 | 35.5 | 75-101.5 | 40 | 50 | 215 |
1 MPa = 1 N/mm2
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 8R40 has very good impact strength both at room temperature and at cryogenic temperatures.
At high temperatures
| Temperature | Proof strength | Tensile strength | |
|---|---|---|---|
| Rp.02 | Rp1.0 | Rm | |
| °C | MPa | MPa | MPa |
| min. | min. | min. | |
| 100 | 175 | 205 | 440 |
| 200 | 155 | 185 | 390 |
| 300 | 135 | 167 | 375 |
| 400 | 125 | 156 | 375 |
| 500 | 119 | 149 | 360 |
Disclaimer: Recommendations are for guidance only, and the suitability of a material for a specific application can be confirmed only when we know the actual service conditions. Continuous development may necessitate changes in technical data without notice. This datasheet is only valid for Sandvik materials.
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