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Home / Products / Butt Weld Fittings / ASME/ASTM SA/A 234 WPB WP11 industrial pipe fittings WP22 welded tee fitting WP9 seamless steel tee schedule 80 steel tee High-Temperature Service Butt Weld Tees and Reducing Tees
quality ASME/ASTM SA/A 234 WPB WP11 industrial pipe fittings WP22 welded tee fitting WP9 seamless steel tee schedule 80 steel tee High-Temperature Service Butt Weld Tees and Reducing Tees factory
quality ASME/ASTM SA/A 234 WPB WP11 industrial pipe fittings WP22 welded tee fitting WP9 seamless steel tee schedule 80 steel tee High-Temperature Service Butt Weld Tees and Reducing Tees factory
quality ASME/ASTM SA/A 234 WPB WP11 industrial pipe fittings WP22 welded tee fitting WP9 seamless steel tee schedule 80 steel tee High-Temperature Service Butt Weld Tees and Reducing Tees factory
quality ASME/ASTM SA/A 234 WPB WP11 industrial pipe fittings WP22 welded tee fitting WP9 seamless steel tee schedule 80 steel tee High-Temperature Service Butt Weld Tees and Reducing Tees factory
quality ASME/ASTM SA/A 234 WPB WP11 industrial pipe fittings WP22 welded tee fitting WP9 seamless steel tee schedule 80 steel tee High-Temperature Service Butt Weld Tees and Reducing Tees factory

ASME/ASTM SA/A 234 WPB WP11 industrial pipe fittings WP22 welded tee fitting WP9 seamless steel tee schedule 80 steel tee High-Temperature Service Butt Weld Tees and Reducing Tees

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butt weld tube fittings

butt weld steel pipe fittings
Product Summary
ASME/ASTM SA/A 234 WPB, WP11, WP22, WP9, WP91, WP5, WP12 equal and reducing tees. Low-alloy steel grades with chromium and molybdenum for enhanced high-temperature strength, oxidation resistance, and creep strength. Ideal for power plants, boilers, and high-temperature piping systems.

Product Details

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ASME/ASTM SA/A 234 WPB Butt Weld Tees

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WP11 – WP22 – WP9 Equal and Reducing Tees

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High-Temperature Service Butt Weld Fittings
Product Description
ASME/ASTM SA/A 234 WPB – WP11 – WP22 – WP9--WP91--WP5--WP12 Equal and Reducing Tees
WP11 Steel Grade Overview

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.

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