Project Description
N06255 Alloy 2550 Corrosion Resistance Alloy Pipe For Oilfield
Alloy 2550 (UNS N06255) is a cold hardened nickel-based alloy intended for corrosion resistance to highly sour (H2S) environments with high chloride content, requiring high strength up to 400°F.
The high nickel and molybdenum content of 2550 extends the sour service limits of nickel alloys while also providing excellent resistance to chlorides and dissolved oxygen. It is therefore used for downhole tubular components, packers, and other subsurface equipment in severely sour wells with high-pressure and high-temperature (HPHT) conditions, saltwater injection wells, and Acid Gas Injection (AGI) wells. However, all environmental factors, including H2S, CO2 , temperature, pH, and chloride concentration, should be considered before final material selection.
For sour service applications, 2550 is classified in MR0175/ISO15156 as a type 4d alloy, with no restrictions to a partial pressure of H2S below 300°F and resistant to 300 psi H2S at 425°F.
CRA 2550E
CRA 2550E (UNS N06255) is a premium, electro-slag re-melted version of alloy 2550. The performance and consistency are enhanced through tightly controlled compositional limits and microstructural cleanliness. CRA 2550E has excellent hydrogen embrittlement resistance at all standard strength levels.
ALSO KNOWN AS
- CRA 2550E
• CRA2550
• 25%CR50%Ni
• SM2550®
SUITABLE APPLICATIONS
Corrosive environments containing high levels of CO2 , H2S, and chlorides
High-pressure, high-temperature (HPHT) wells
Acid gas injection wells
Water alternating gas wells
Salt water disposal (SWD) wells containing dissolved oxygen
PRODUCT AVAILABILITY
FORMS:Seamless Pipe, Tubing
OD:MIN OD: 2-7/8” MAX OD: 10-3/4”
Standard & Non-Standard Sizes Available
RANGE:R1, R2, R3, Lengths up to 70
CHEMICAL COMPOSITION
| C | Cr | Ni | Fe | Mn | Si | Mo | Cu | P | S | Ti | W |
| ≤ 0.03 | 23 – 26 | 47 – 52 | BAL | ≤ 1 | ≤ 1 | 6 – 9 | ≤ 1.2 | ≤ 0.03 | ≤ 0.03 | ≤ 0.69 | ≤ 3 |
MANUFACTURING PROCESS
| PROCESS | DESCRIPTION |
| Steel Making | Made by electric furnace process followed by Vacuum Oxygen Decarburization (VOD) or Argon Oxygen Decarburization (AOD) |
| Pipe Making | Manufactured by traditional tube manufacturing processes, High strength tubulars should be furnished in cold worked condition |
| Heat Treatment | Solution Annealing Process |
API 5CRA / ISO 13680 Group 2 Category 25-50-6
| Grade | Yield Strength ksi |
Tensile Strength ksi |
Elongation % |
Hardness HRC |
NACE MR0175/ISO 15156 H2S Sour Service Limits |
||
| min | max | min | min | max | |||
| 110 | 110 | 140 | 125 | 11 | 35 | Table A.14 | No limit ≤ 300°F, Refer to table for temperatures up to 400°F |
| 125 | 125 | 150 | 130 | 10 | 37 | ||
| 140 | 140 | 160 | 145 | 9 | 38 | 140 Grade not recommended for sour service | |
| *NACE MR0175/ISO 15156 LIMITS YIELD STRENGTH TO 150 ksi, Non-standard mechanical properties and grades are made available upon agreement. | |||||||
TYPICAL PHYSICAL PROPERTIES
| 70°F | 250°F | 350°F | 450°F | ||
| Density | lbs/in3 | 0.297 | 0.296 | 0.295 | 0.294 |
| Thermal Expansion | X10-6/°F | 7.2 | 7.4 | 7.7 | |
| Elastic Modulus | psi x 106 | 28.5 | 27.9 | 27.8 | 27.6 |
| Poisson Ratio | 0.29 | 0.29 | 0.29 | 0.3 | |
| Thermal Conductivity | W/ft h °F | 1.5 | 1.8 | 2 | 2.2 |
| Specific Heat | Btu/lb °F | 0.09 | 0.1 | 0.1 | 0.11 |
We are committed to integrate steel resources in china and serve the global steel market. Our company has more than 15 years of experience in steel researching, production, managing and sales. And our team mostly are based on and worked in national famous steel enterprise before. In the aspect of resources and information, we have established cooperative relationship with nearly hundred enterprises, either state-owned or private owned in China.
What’s more, we have built long, deep and close business relationship with dozens of steel company, Sharing and holding equities with several steel enterprises. Because of the close cooperation with steel companies and our pioneering spirit, which can ensure us stay at the top competition, and ensure our customers get what they really want. We provide preffesional one-stop service to the Contractors of follows project:
- Oil and Gas Pipeline Construction
- Onshore and Offshore
- Boiler Manufacturers
- Oil Refining Equipment
- Petroleum and Chemical Plant Construction
- Fire Protection
- Heating & Air Conditioning
Our ability to purchase materials directly from leading mills at the best possible price will give you the competitive edge. This coupled with a skilled workforce dedicated to embracing the demands of the markets we serve. Just give us a call +86-731-89903933.
