ASTM A234 WP9-S 180 Degree Elbow SR For High Temperature And Pressure Application

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Model Number:ASTM A234 WP9-S 180 Degree Elbow SR
Minimum Order Quantity:1 PC
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ASTM A234 WP9-S 180 Degree Elbow SR For High Temperature and Pressure Application


A 180°Elbow SR (Short Radius) is a pipe fitting that changes the direction of flow by 180 degrees (a complete U-turn) with a tighter bend radius compared to a Long Radius (LR) elbow.


Below are the key details:


1. Material: ASTM A234 WP9
Chemical Composition of ASTM A234 WP9

The composition is based on heat analysis (in weight percentage, %):

ElementComposition (%)
Carbon (C)≤ 0.15
Manganese (Mn)0.30 – 0.60
Phosphorus (P)≤ 0.03
Sulfur (S)≤ 0.03
Silicon (Si)0.50 – 1.00
Chromium (Cr)8.00 – 10.00
Molybdenum (Mo)0.90 – 1.10
Nickel (Ni)≤ 0.40
Vanadium (V)≤ 0.03
Columbium (Cb/Nb)≤ 0.08

Notes:

  • The material is a low-alloy steel with 9% Cr and 1% Mo, designed for high-temperature service.
  • Residual elements (Cu, Ni, etc.) may be present in small amounts.


Mechanical Properties of ASTM A234 WP9

PropertyValue
Tensile Strength (min)415 MPa (60,000 psi)
Yield Strength (min)205 MPa (30,000 psi)
Elongation (min)20% (in 50 mm / 2 in)
Hardness (max)197 HBW (Brinell) / 92 HRB (Rockwell B)

Notes:

  • Mechanical properties are typically tested at room temperature.
  • WP9 retains strength at elevated temperatures (up to ~600°C / 1112°F).
  • Impact testing (Charpy V-notch) may be required for certain applications.

Comparison with Other Grades

GradeCr (%)Mo (%)Tensile (MPa)Common Use
WP54.0–6.00.45–0.65415Moderate temp
WP98.0–10.00.90–1.10415High temp/pressure
WP111.0–1.500.44–0.65415Steam services

2. 180°Elbow

A pipe fitting that changes the direction of flow by 180 degrees (U-turn).

Commonly used in piping systems where a complete reversal of flow is needed.


SR (Short Radius)

The center-to-end dimension is 1.0 × Nominal Pipe Size (NPS).

Compared to Long Radius (LR) elbows (1.5 × NPS), SR elbows have a tighter bend, saving space but increasing flow resistance.


Why Use WP9-S (Seamless) & Short Radius?

FeatureAdvantage
Material (WP9)High creep strength, oxidation resistance (9% Cr, 1% Mo).
Seamless (S)No weld seams = better pressure integrity, ideal for critical services.
Short Radius (SR)Saves space in congested areas (e.g., skid-mounted plants, ship piping).
180° BendAllows full flow reversal where piping must double back (U-turn configurations).


Alternative Materials for Comparison

Material GradeUse CaseTemp Limit
A234 WP9High-temp steam, hydrogen serviceUp to 600°C (1112°F)
A234 WPBLow-temp water/oil (carbon steel)Up to 350°C (662°F)
A403 WP316Corrosive fluids (stainless steel)Up to 800°C (1472°F)

The applications of ASTM A234 WP9-S 180 Degree Elbow SR:


1. Power Generation Plants

  • Steam Lines: Used in boiler systems, turbine connections, and high-pressure steam piping (up to 600°C/1112°F).
  • Heat Recovery Steam Generators (HRSG): Handles thermal cycling in combined-cycle power plants.
  • Superheater/Economizer Piping: Resists oxidation and creep at elevated temperatures.

2. Oil & Gas Refineries

  • Hydroprocessing Units: Found in hydrocrackers and hydrotreaters due to corrosion resistance
  • Catalytic Reforming: Withstands sulfur-containing hydrocarbons at high temps.
  • FCC (Fluid Catalytic Cracking) Units: Manages hot catalyst-laden gases.

3. Petrochemical & Chemical Processing

  • Ethylene Crackers: Used in pyrolysis coils handling extreme heat.
  • Hydrogen Service: Resists hydrogen embrittlement in high-pressure H₂ pipelines.
  • Sulfuric Acid/Ammonia Plants: Compatible with corrosive process streams.

4. High-Temperature Pipelines

  • District Heating Systems: Transfers superheated water/steam in compact layouts.
  • Cogeneration Plants: Short-radius 180° bends save space in tight installations.


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ASTM A234 WP9-S 180 Degree Elbow SR For High Temperature And Pressure Application

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