ASTM A182 – Forged or Rolled Alloy and Stainless Steel Pipe Flanges, Forged Fittings, and Valves and Parts for High-Temperature Service
Grade: F12 Class1 and Class2
Chemical Requirements max,%
| Elements | F12 Class1 | F12 Class2 |
| Carbon | 0.05-0.15 | 0.10-0.20 |
| Manganese | 0.30-0.60 | 0.30-0.60 |
| Phosphorus | 0.045 | 0.040 |
| Sulfur | 0.045 | 0.040 |
| Silicon | 0.50 | 0.10-0.60 |
| Chromium | 0.80-1.25 | 0.80-1.25 |
| Molybdenum | 0.44-0.65 | 0.44-0.65 |
Tensile and Hardness Requirements
| Grade Symbol | F12 Class1 | F12 Class2 |
| Tensile Strength,min, ksi [Mpa] | 60[415] | 70[485] |
| Yield Strength, min,ksi [MPa] | 32[220] | 40[275] |
| Elongation in 2 in.[50 mm] or 4D,min, % | 20 | 20 |
| Reduction of Area, min, % | 45 | 30 |
| Brinell HardnessNumber | 121-174 | 143-207 |