15CR, UHP-15CR, Ultra Hyper Chrome, UHP, 15CR UHP
Alloy Group
Martensitic Stainless Steel
Corrosion Resistance
Mild
Yield Strength
80
—
150
Wall Tolerance
0.875
Density
0.2837
PREN
21.59
—
25.9
15 Chrome, also known as Super 15 Chrome, is a quenched and tempered martensitic-ferritic stainless steel designed for corrosion resistance in sweet (CO2) environments with moderate chloride levels, offering high strength up to 400°F. Compared to standard 13 Chrome, 15 Chrome provides enhanced mechanical properties and superior resistance to the effects of CO2, chlorides, pH variations, and higher temperatures. Its improved strength and temperature tolerance, relative to Super 13 Chrome, make it suitable for deeper wells operating under high-pressure, high-temperature (HPHT) conditions, where it is used in downhole tubular components, packers, and other subsurface equipment.
In certain applications, 15 Chrome may serve as a more cost-effective alternative to duplex stainless steels like 22 Chrome in HPHT environments. However, it is crucial to evaluate all relevant environmental factors, such as H2S, CO2, temperature, pH, and chloride concentration, before finalizing material selection.
Super 15 Chrome, grade 125, is not recommended for use in sour service conditions.
Martensitic stainless steels, such as 13 Chrome and its enhanced variants, are widely used as downhole tubular components in mildly corrosive environments, such as sweet (CO2) wells, where carbon and low alloy steels experience general corrosion. These alloys are typically quenched and tempered to achieve yield strengths in the range of 80 to 140 ksi.
| Grade | Yield Strength ksi | Tensile Strength ksi | Elongation % | Hardness HRC | NACE MR0175/ISO 15156 H2S Sour Service Limits |
|
| min | max | min | min | max | ||
| 125 | 125 | 150 | 135 | Function of specimen size & strength | 37 | Not recommended for sour service |
* Non-standard mechanical properties and grades are made available upon agreement.
