ASTM A335 – Seamless Ferritic Alloy-Steel Pipe for High-Temperature Service Grade: P5 Chemical Requirements  max  % Elements Composition Carbon 0.15 Manganese 0.30–0.60 Phosphorus 0.025 Sulfur 0.025 Silicon 0.50 Chromium 4.00 – 6.00 Molybdenum 0.45 – 0.65   Tensile Requirements Tensile strength, min ksi[Mpa] 60[415] Yield strength, min: ksi[Mpa] 30[205]   Elongation Requirements Longitudinal  Transverse Elongation in 2 in. or 50 mm, (or 4D), min, %:…