ASTM A234 WP9 Elbow Pipe Fittings ASME B16.9 Manufacturer & Exporter
We are a leading manufacturer and supplier of ASTM A234 WP9 Elbows for high-temperature and high-pressure piping systems. Our WP9 alloy steel elbows are produced according to ASME B16.9, MSS-SP-75, and ASTM A234 requirements, ensuring excellent creep strength, oxidation resistance, and long service life in boiler, refinery, and petrochemical applications.
What is ASTM A234 WP9?
ASTM A234 WP9 is a Cr-Mo alloy steel (9% Cr, 1% Mo) used for elevated-temperature service. It offers:
- Superior creep resistance
- Excellent high-temperature strength
- Good oxidation and corrosion resistance
- Reliable weldability and stability after heat treatment
It is commonly used in power plants, refinery heater lines, steam lines, and superheater piping systems.
Chemical Composition of A234 WP9
| Grade | C | Mn | Si | S | P | Cr | Mo |
|---|---|---|---|---|---|---|---|
| A234 WP9 | ≤0.15 | ≤0.6 | 1.00 | ≤0.03 | ≤0.03 | 8-10 | 0.90-1.10 |
Mechanical Propery of A234 WP9
| Grade | Tensile Strength (Mpa) | Yield Strength (Mpa) | Elongation % |
|---|---|---|---|
| A234 WP9 | 380 min | 585 min | ≥30 |
Types of A234 WP9 Fittings
We supply all sizes and schedules of WP9 elbows, including:
- A234 WP9 45° Elbow (Short & Long Radius)
- A234 WP9 90° Elbow (LR & SR)
- A234 WP9 180° Return Bend
- A234 WP9 Tee
- A234 WP9 Reducer
Available wall thickness: SCH 40, SCH 80, SCH 160, XXS
Dimensions: DN15–DN1200 / ½” to 48”
Manufacturing Standards
Our ASTM A234 WP9 elbows comply with:
- ASTM A234 / ASME SA234
- ASME B16.9
- MSS-SP-75
- EN 10253-2
- NACE MR0103 / MR0175 (on request)
Heat Treatment for ASTM A234 WP9
Heat treatment is a mandatory and critical process for WP9 fittings to develop the required mechanical properties (strength, ductility, toughness) and to ensure microstructural stability at high service temperatures.
The standard heat treatment for WP9 is Full Annealing or Normalizing and Tempering.
1. Normalizing
- Process: The fitting is heated to a temperature above its upper critical transformation temperature (Ac₃), typically in the range of 1650°F – 1750°F (900°C – 955°C).s.
2. Tempering (or Stress Relieving)
- Process: Immediately after normalizing, the fitting is reheated to a sub-critical temperature. The standard tempering range for WP9 is 1250°F – 1400°F (675°C – 760°C).
Heat treatment records are provided with EN 10204 3.1 MTC.
Why Choose our WP9 Elbow?
- In-house forging & heat-treatment facility
- 100% dimensional and visual inspection
- PMI testing for Cr-Mo material verification
- Ultrasonic testing (UT) & radiography on request
- Global export experience (Asia, Middle East, Europe)
- Fast delivery for standard sizes
Order Example:
ASTM A234 WP9 Elbow, 90°, Long Radius (LR), 6″ SCH 40, ASME B16.9, BW Ends, Heat Treatment: Normalized & Tempered (N+T), Hardness ≤ 197 HB, MTC EN 10204 3.1, Black Surface, Qty: 40 PCS.
Available Related Products
- ASTM A234 WP5 Elbows
- ASTM A234 WP11 Elbows
- ASTM A234 WP22 Pipe Fittings
- ASTM A335 P9 Alloy Steel Pipes
- ASTM A182 F9 Flanges
