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WP11 is a low-alloy ferritic steel grade commonly used for high-temperature service in power plants, boilers, and piping systems. It is part of the ASTM A335 (seamless ferritic alloy-steel pipe for high-temperature service) and A182 (forged or rolled alloy-steel pipe flanges, fittings, etc.) family, typically designated as Grade 11 or P11/F11.
Chemical Composition
Element
Composition Range
Carbon (C)
0.05 – 0.15%
Manganese (Mn)
0.30 – 0.60%
Silicon (Si)
0.50 – 1.00%
Chromium (Cr)
1.00 – 1.50%
Molybdenum (Mo)
0.44 – 0.65%
Phosphorus (P)
≤ 0.025% (max)
Sulfur (S)
≤ 0.025% (max)
Nickel (Ni)
≤ 0.40% (max)
Vanadium (V)
≤ 0.08% (max)
Key Composition Characteristics
Chromium (1–1.5%): Improves oxidation and corrosion resistance at elevated temperatures and increases high-temperature strength
Molybdenum (0.44–0.65%): Enhances creep strength and improves hardenability and high-temperature performance
Low Carbon Content (0.05–0.15%): Maintains good weldability and reduces risk of brittle microstructures
Silicon and Manganese: Aid in deoxidation and improve high-temperature oxidation resistance, strength, and toughness
Typical Applications
Superheater and reheater tubes
High-temperature steam piping
Headers, fittings, and flanges in thermal power plants and refineries
Important Note: For exact composition requirements, always consult the specific standard edition and manufacturer's mill test certificate (MTC) or material test report (MTR).
WP22 Steel Grade Overview
WP22 is a low-alloy steel grade used in high-temperature piping systems such as power plants and refineries. This chromium-molybdenum alloy steel is defined in standards like ASME/ASTM A234 WP22 (fittings) or A335 P22 (pipes).
Chemical Composition
Element
Composition Range
Carbon (C)
0.05 – 0.15%
Manganese (Mn)
0.30 – 0.60%
Silicon (Si)
0.50% max
Chromium (Cr)
1.90 – 2.60%
Molybdenum (Mo)
0.87 – 1.13%
Phosphorus (P)
0.030% max
Sulfur (S)
0.030% max
Practical Implications
Low carbon content ensures good weldability while maintaining strength through heat treatment
Chromium (~2%) provides high-temperature strength and oxidation/corrosion resistance
Molybdenum (~1%) significantly boosts creep strength and high-temperature performance
WP9 Steel Grade Overview
WP9 is a low-alloy steel grade used for high-temperature service in power plants, boilers, and piping systems, defined in standards like ASTM A335 and ASTM A182.
Chemical Composition
Element
Composition Range
Chromium (Cr)
8.0 – 10.0%
Molybdenum (Mo)
0.90 – 1.10%
Carbon (C)
≤ 0.15%
Manganese (Mn)
≤ 0.60%
Silicon (Si)
≤ 1.00%
Phosphorus (P)
≤ 0.030%
Sulfur (S)
≤ 0.030%
Iron (Fe)
Balance
Composition Significance
Chromium (8–10%): Provides high-temperature strength and oxidation resistance for withstanding hot steam and flue gas
Molybdenum (~1%): Improves creep strength and enhances high-temperature tensile strength and hardness
Low Carbon: Maintains weldability and reduces cracking risk in heat-affected zones
Tight P and S Controls: Prevents brittleness and hot cracking
Application Considerations
WP9 is selected for piping or components operating at elevated temperatures (typically 500–600°C range) where a balance between cost, high-temperature strength, and corrosion/oxidation resistance is required.