TU 14-1-493-72 extract
Extract from TU 14-1-493-72
Hot-rolled sheet metal from alloy grade ХН70Ю (ЭИ652).
Technical requirements:
1. The chemical composition of the alloy ХН70Ю (ЭИ652) must comply with GOST 5632.
2. The mechanical properties of sheets during short-term tensile tests carried out on samples heat-treated according to the mode: air quenching from a temperature of (1200±10°), must satisfy the requirements specified in Table 1.
Table 1
| Test temperature °C | Mechanical properties (not less than) | |
| Ultimate strength, σ in N/mm 2 (kgf/mm 2 ) | Relative elongation, δ 5 , % | |
| 20 | 740 (75) | 30 |
| 900 | 150 (15) | 20 |
3. Long-term strength must meet the requirements of Table 2.
Table 2
| T/processing mode | Test temperature °C | Long lasting strength | |
| Continuously applied stress, N/mm² (kgf/mm²) | Test time in hours (not less than) | ||
| Air hardening at (1200±10)°C | 900° | 29 (3) | 100 |
4. Sheets are supplied in a heat-treated and etched condition.
