1. Summary
The addition of carbon stabilizing element Ti to 304 steel grade inhibits grain boundary sensitization and can be used in the sensitization range (450~8500C).
2. Features
1) Excellent resistance to intergranular corrosion;
2) Used for parts that cannot be heat treated after welding;
3) Excellent welding performance and better processing performance.
3. Scope of application
Heat exchangers, pipes, expansion joints, aviation equipment, exhaust pipes, boiler parts, parts/equipment that cannot be heat treated after assembly.
4. Chemical composition (JIS G 4305-2005) (wt%)
Chemical composition | C | Si | Mn | P | S | Cr | Ni | Ti |
Standard | ￡0.08 | ￡1.0 | ￡2.0 | ￡0.045 | ￡0.030 | 17.0~19.0 | 9.0~13.0 | ≥ 5XC% |
| General | 0.04 | 0.50 | 1.3 | 0.026 | 0.001 | 17.70 | 9.10 | 0.30 |
5. Performance (JIS G 4305-2005)
Distinguish | Mechanical properties | |||
Ys (Mpa) | Ts (Mpa) | El (%) | Hv | |
Standard | ≥ 205 | ≥ 520 | ≥ 40 | ≤ 200 |
| General | 270 | 610 | 51 | 155 |
6. Physical properties
| Density (g/cm3) | Magnetic | Specific heat (J/g.0C) | Thermal conductivity 1000C(W/m. 0C) | Thermal expansion rate 20~1000C(10-6/0C) |
| 7.93 | No | 0．5 | 16.1 | 16．7 |
7. Heat treatment
Melting point: 1400~14250C;
Solution treatment: 920~11500C. To
8. Use status
1) Annealing and solid solution state:
NO. 1, 2D, 2B, and various other surface treatment states
2) Rolling hard.
9. Matters needing attention
Magnetism will appear after processing;
Due to the addition of Ti, its surface color is relatively poor with 304.