ASTM A182 – Forged or Rolled Alloy and Stainless Steel Pipe Flanges, Forged Fittings, and Valves and Parts for High-Temperature Service
Grade: F11 Class1, Class2 and Class3
Chemical Requirements max,%
| Elements | F11 Class1 | F11 Class2 | F11 Class3 |
| Carbon | 0.05-0.15 | 0.10-0.20 | 0.10-0.20 |
| Manganese | 0.30-0.60 | 0.30-0.80 | 0.30-0.80 |
| Phosphorus | 0.030 | 0.040 | 0.040 |
| Sulfur | 0.030 | 0.040 | 0.040 |
| Silicon | 0.5-1.0 | 0.5-1.0 | 0.5-1.0 |
| Chromium | 1.00-1.50 | 1.00-1.50 | 1.00-1.50 |
| Molybdenum | 0.44-0.65 | 0.44-0.65 | 0.44-0.65 |
Tensile and Hardness Requirements
| Grade | F11 Class1 | F11 Class2 | F11 Class3 |
| Tensile Strength,min, ksi [Mpa] | 60[415] | 70[485] | 75[515] |
| Yield Strength, min,ksi [MPa] | 30[205] | 40[275] | 45[310] |
| Elongation in 2 in.[50 mm] or 4D,min, % | 20 | 20 | 20 |
| Reduction of Area, min, % | 45 | 30 | 30 |
| Brinell HardnessNumber | 121-174 | 143-207 | 156-207 |