ASTM A182 – Forged or Rolled Alloy and Stainless Steel Pipe Flanges, Forged Fittings, and Valves and Parts for High Temperature Service
This specification covers forged low alloy and stainless steel piping components for use in pressure systems. Included re flanges, fittings, valves, and similar parts to specified dimensions or to dimensional standards. Several grades of low alloy steels and ferritic, martensitic, austenitic, and ferritic-austenitic stainless steels are included in this specification. Selection will depend upon design and service requirements.
Grade (UNS): F6NM (S41500) Martensitic Stainless Steel
Heat Treatment
Normalizing at a minimum temperature of 1850 ℉[1010℃] and tempering at 1040 ℉-1120 ℉ [560℃-600℃]
Chemical Requirements Composition, max, %
| Elements | F6NM (S41500) |
| Carbon | 0.05 |
| Manganese | 0.50-1.00 |
| Phosphorus | 0.030 |
| Sulfur | 0.030 |
| Silicon | 0.60 |
| Nickel | 3.5-5.5 |
| Chromium | 11.5-14.0 |
| Molybdenum | 0.50-1.00 |
Tensile and Hardness Requirements
| Grade Symbol | F6NM (S41500) |
| Tensile Strength,min, ksi [Mpa] | 115[790] |
| Yield Strength, min,ksi [MPa] | 90[620] |
| Elongation in 2 in.[50 mm] or 4D,min, % | 15.0 |
| Reduction of Area, min, % | 45.0 |
| Brinell HardnessNumber | ≤295 |