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Description
Alloy special structural steels. Cr-Mo-steels with > 0.35% Mo.
Applications
High-temperature structural steel: Collectors, water boiler and superheater tubes (530oC).
Physical properties (avarage values) at ambient temperature
Modulus of elasticity [103 x N/mm2]: 210
Density [g/cm3]: 7.85
Soft Annealing
Heat to 680-720oC, cool slowly in furnace.
Hardening
Harden from a temperature of 910-940oC followed by oil or air quenching.
Tempering
Tempering temperature: 650-720oC.
Mechanical Properties in Hardened and Tempered Condition
| Diameter in mm | 0.2 % proof stress (N/mm2) | Tensile strength (N/mm2) | Elongation (%) | Impact strength (J) |
| up to 60 | 295 | 440-590 | 20 | 44 |
| 61-90 | 285 | 440-590 | 20 | 44 |
| 91-150 | 275 | 440-590 | 20 | 44 |
0.2 % Proof Stress (N/mm2) vs. Temperature
| 100oC | 150oC | 200oC | 250oC | 300oC | 350oC | 400oC | 450oC | 500oC |
| 260 | 245 | 240 | 230 | 215 | 200 | 190 | 180 | 175 |
| 250 | 240 | 230 | 220 | 205 | 190 | 180 | 170 | 165 |
| 250 | 235 | 220 | 210 | 195 | 180 | 170 | 160 | 155 |
1 % Creep Limit (N/mm2) vs. Temperature (oC)
| Hours | 450oC | 460oC | 480oC | 500oC | 520oC | 540oC | 560oC |
| 10 000 | 245 | 228 | 193 | 157 | 122 | 90 | 64 |
| 100 000 | 191 | 172 | 133 | 98 | 70 | 46 |
COPYRIGHT © 2019. HAIXIANG METAL TECHNOLOGY (HANGZHOU) CO., LTD. ALL RIGHTS RESERVED
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