Pressure Rating Of Super Duplex 2507 Pipe
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Pressure Rating of Super Duplex 2507 Pipe: A Complete Guide
Super duplex stainless steel 2507, also known as UNS S32750 or EN 1.4410, is one of the most robust stainless steels used in highly corrosive and high-pressure environments. Its high mechanical strength, superior corrosion resistance, and excellent stress corrosion cracking resistance make it ideal for demanding applications such as offshore oil and gas, chemical processing, and desalination plants.
In this article, we focus on the pressure rating of super duplex 2507 pipe, including how it varies by pipe schedule, size, temperature, and applicable industry standards.
What Is Super Duplex 2507?
Super Duplex 2507 is a duplex stainless steel with a balanced austenitic-ferritic microstructure, offering:Yield strength ~550 MPa (twice that of austenitic 304/316),High resistance to pitting, crevice, and chloride stress corrosion,Excellent toughness and impact resistance, even at sub-zero temperatures.
Pressure Rating Factors for 2507 Pipe
The pressure rating of a 2507 pipe depends on several key factors:
Pipe Schedule: Thicker walls (higher schedules like SCH 80, SCH 160) withstand higher pressure.
Outer Diameter: Smaller diameter pipes generally withstand higher pressure.
Design Temperature: Higher temperatures reduce pressure rating due to material strength loss.
Applicable Standards: ASME B31.3, ASME B36.19, EN 10216-5, ASTM A790, etc.
Pressure Ratings of Super Duplex 2507 Pipe
Below is a general pressure rating chart (approximate) for 2507 seamless pipe, based on ASME B31.3 and ANSI/ASME B36.19 standards, at ambient temperature (up to 38°C / 100°F):
| NPS (inches) | Schedule | Wall Thickness (mm) | Pressure Rating (bar) | Pressure Rating (psi) |
|---|---|---|---|---|
| 1" | 40 | 3.38 | ~430 | ~6240 |
| 2" | 40 | 3.91 | ~285 | ~4130 |
| 4" | 40 | 6.02 | ~200 | ~2900 |
| 6" | 40 | 7.11 | ~160 | ~2320 |
| 8" | 40 | 8.18 | ~120 | ~1740 |
2507 Stainless Steel Temperature Derating Factor
| Temperature (°C) | Strength Reduction Factor |
|---|---|
| 100 | 1.00 |
| 150 | 0.95 |
| 200 | 0.90 |
| 250 | 0.85 |
| 300 | 0.80 |
To calculate pressure at elevated temperatures:Adjusted Pressure Rating = Base Rating × Reduction Factor
Applicable Standards for 2507 Pipes
2507 pipe products are typically manufactured and rated under the following standards:
ASTM A790 / A928 – Seamless and welded super duplex pipe
ASME B36.19 / B36.10 – Pipe dimensions and schedules
ASME B31.3 / B31.1 – Pressure piping design
EN 10216-5 – European standard for seamless stainless steel tubes for pressure use
