ASTM A193 B8MA A320 B8MA W 1.4435
The ASTM A193 grade B8MA or A320 B8MA specification defines the technical characteristics of stainless steel hardware suitable for application in pressure vessels and in the presence of high or low temperature (service temperatures -196°C to 800°C); this type of hardware is widely used in the petroleum chemical plant and energy sectors. It differs from ASTM A193 B8M or A320 B8M by the fact that the finished parts undergo solubilization treatment to achieve hardness in the 90-192 HB range.
CHEMICAL CHARACTERISTICS ASTM A193 B8MA A320 B8MA W 1.4404
| Element | Content |
|---|---|
| C max | 0.08 |
| S max | 0.030 |
| P max | 0.045 |
| Yes max | 1.0 |
| Mn max | 2.0 |
| Cr | 16.0 – 18.0 |
| Ni | 10.0 – 14.0 |
| Mo | 2.0 – 3.0 |
MECHANICAL COMPOSITION ASTM A193 B8MA A320 B8MA W 1.4404
| Material | League | Rm min | Rp 0.2 min | A% min | Z% min | Hardness max |
|---|---|---|---|---|---|---|
| ASTM A193 B8MA Class 1 | 1.4404 | 515 | 205 | 30 | 50 | 192 HB |
PHYSICAL PROPERTIES
- Bulk density: 8.0 kg/cm³ at 20°C
- Modulus of elasticity: 200,000 N/mm² at 20°C
- Thermal conductivity: 14.6 W/m.K at 20°C
- Specific heat: 500 J/g.K at 20°C
- Coefficients of linear expansion: 16.5 (20° – 200°C), 17.5 (20° – 400°C), 19.0 (20° – 600°C)
- Electrical resistivity: 0.75 Ω mm²/m at 20°C
- Amagnetic: Yes
CORRESPONDENCE AND SPECIFICATIONS ASTM A193 B8MA A320 B8MA W 1.4404
- EN 10088/3: X2 Cr Ni Mo 17-12-2
- W: 1.4404
- JIS: G4303 – SUS316
- AISI: 316 L
- ISO 3506-1/2: A4-50
