Alleima® 8LR70 is an austenitic, titanium-stabilized stainless chromium–nickel steel alloyed with molybdenum.
Standards
- ASTM: 316Ti
- UNS: S31635
- EN Number: 1.4571
- W.Nr.: 1.4571
- SS: 2350
Product standards
- EN 10088-3
- ASTM A-314
Suitable for production of flanges etc. according to ASTM A-182
Certificates
Status according to EN 10 204 3.1
Chemical composition (nominal) %
| C | Si | Mn | P | S | Cr | Ni | Mo | Others |
|---|---|---|---|---|---|---|---|---|
| max | max | |||||||
| 0.06 | 0.5 | 1.8 | 0.045 | 0.030 | 17 | 11 | 2.1 | Ti>6xC |
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
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 | % | % | |
| ≥210 | ≥245 | 515-700 | ≥40 | ≥50 | ≤215 |
| Proof strength | Tensile strength | Elong. | Contr. | HB | |
|---|---|---|---|---|---|
| Rp0.2a) | Rp1.0 a) | Rm | Ab) | Z | |
| ksi | ksi | ksi | % | % | |
| ≥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 8LR70 has very good impact strength both at room temperature and at cryogenic temperatures.
Tests on bar have demonstrated that the steel fulfils the requirements (60 J (44 ft-lb) at -196 oC (-320 oF)) according to the European standards prEN13445-2(UFPV-2) and EN 10272.
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 |
| Temperature | Proof strength | Tensile strength | |
|---|---|---|---|
| Rp.02 | Rp1.0 | Rm | |
| °F | ksi | ksi | ksi |
| min. | min. | min. | |
| 200 | 25.4 | 29.7 | 63.8 |
| 400 | 22.5 | 26.8 | 56.6 |
| 600 | 19.6 | 24.2 | 54.4 |
| 800 | 18.1 | 22.5 | 54.4 |
| 1000 | 17.2 | 21.6 | 52.2 |
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 Alleima materials.