17CR, 17CRS, Super 17Cr
Alloy Group
Martensitic Stainless Steel
Corrosion Resistance
Mild
Yield Strength
125
—
145
Wall Tolerance
0.875
Density
0.28
PREN
24.25
—
29.55
17 Chrome is a quenched and tempered martensitic-ferritic stainless steel designed for corrosion resistance in sweet (CO2) environments with moderate chloride levels, providing high strength up to 400°F. Compared to standard 13 Chrome, 17 Chrome offers improved mechanical properties and greater resistance to the effects of CO2, chlorides, pH variations, and elevated temperatures. Its higher strength and better temperature resistance, relative to Super 13 Chrome, make it well-suited for high-pressure, high-temperature (HPHT) conditions in deeper wells, where it is used in downhole tubular components, packers, and other subsurface equipment.
In certain HPHT applications, 17 Chrome can be a cost-effective alternative to duplex stainless steels like 22 Chrome. However, it is essential to consider all environmental factors, such as H2S, CO2, temperature, pH, and chloride concentration, before selecting the appropriate material.
17 Chrome is not recommended for use in sour service environments.
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 | 145 | 130 | Function of specimen size | 38 | Not recommended for sour service | H2S ≤ 1.5 psi, pH ≥ 3.5 |
* Non-standard mechanical properties and grades are made available upon agreement.
