Project Description
2507 1.4410 S31260 Duplex Stainless Steel Pipe For Oilfield
1.4410 UNS S31260, also referred to as 2507 Duplex or Duplex 25 Chrome, is a cold hardened duplex stainless steel intended for corrosion resistance in sweet (CO2) and mildly sour (H2S) environments with high chloride content, requiring high strength up to 450°F.
25 Chrome offers increased resistance to the effects of CO2 , chlorides, pH, and temperatures relative to 22 Chrome allowing use as downhole tubular components, packers, and other subsurface equipment in deeper wells with high-pressure and high-temperature (HPHT) conditions where pitting corrosion from high chlorides are a concern.
This alloy is classified in MR0175/ISO15156 as a duplex stainless steel having a Pitting Resistance Equivalent Number ≤40, suitable for H2S partial pressure ≤0.3 psi.
ALSO KNOWN AS
- 25 Chrome Duplex
• 25Cr
• SM25CR®
• VM® 25
• 2507
• Duplex 2507 - 1.4410
SUITABLE APPLICATIONS
Corrosive environments containing the presence of CO2 , low H2S, and chlorides High-pressure, high-temperature (HPHT), sweet (CO2) environments where localized corrosion is a concern (high temperature, high chlorides, and low pH)
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
CHEMICAL COMPOSITION
| C | Cr | Ni | Fe | Mn | Si | Mo | Cu | P | S | W | N |
| ≤ 0.03 | 24 – 26 | 5.5 – 7.5 | BAL | ≤ 1 | ≤ 0.75 | 2.5 – 3.5 | 0.2 – 0.8 | ≤ 0.03 | ≤ 0.03 | 0.1 – 0.5 | 0.1 – 0.3 |
MANUFACTURING PROCESS
| PROCESS | DESCRIPTION |
| Steel Making | Made by electric furnace process or blast furnace followed by Vacuum Oxygen Decarburization (VOD) process or Argon Oxygen Decarburization (AOD) Process |
| Pipe Making | Manufactured by traditional tube manufacturing processes, High strength tubulars should be furnished in cold worked condition |
| Heat Treatment | Solution Annealing Process before final cold drawing |
API 5CRA / ISO 13680 Group 2 Category 25-7-3
| Grade | Yield Strength ksi |
Tensile Strength ksi |
Elongation % |
Hardness HRC |
NACE MR0175/ISO 15156 H2S Sour Service Limits |
||
| min | max | min | min | max | |||
| 65 | 65 | 90 | 90 | 25 | 26 | Table A.24 (annealed) |
H2S ≤ 3.0 psi, Temp ≤ 450°F |
| 75 | 75 | 100 | 90 | 25 | 26 | ||
| 110 | 110 | 140 | 125 | 11 | 36 | Table A.25 (cold-worked) |
H2S ≤ 3.0 psi |
| 125 | 125 | 150 | 130 | 10 | 36 | ||
| 140 | 140 | 160 | 145 | 9 | 38 | 140 Grade not recommended for sour service | |
| *Non-standard mechanical properties and grades are made available upon agreement. | |||||||
TYPICAL PHYSICAL PROPERTIES
| 70°F | 200°F | 400°F | ||
| Density | lbs/in3 | 0.28 | ||
| Thermal Expansion | X10-6/°F | 7 | 7.5 | 8 |
| Elastic Modulus | psi x 106 | 29 | 28.2 | 27 |
| Poisson Ratio | 0.24 | 0.24 | 0.24 | |
| Thermal Conductivity | Btu/ft h °F | 8 | 9 | 10 |
| Specific Heat | Btu/lb °F | 0.12 | 0.12 | 0.12 |
Intergranural Corrosion
2507’s low carbon content greatly lowers the risk of carbide precipitation at the grain boundaries during heat treatment; therefore, the alloy is highly resistant to carbide-related intergranular corrosion.
Stress Corrosion Cracking
The duplex structure of 2507 provides excellent resistance to chloride stress corrosion cracking (SCC). Because of its higher alloy content, 2507 is superior to 2205 in corrosion resistance and strength. 2507 is especially useful in offshore oil and gas applications and in wells with either naturally high brine levels or where brine has been injected to enhance recovery.
Pitting Corrosion
Different testing methods can be used to establish the pitting resistance of steels in chloride-containing solutions. The data above were measured by an electrochemical technique based on ASTM G 61. The critical pitting temperatures (CPT) of several high-performance steels in a 1M sodium chloride solution were determined. The results illustrate the excellent resistance of 2507 to pitting corrosion. The normal data spread for each grade is indicated by the dark gray portion of the bar.
Crevice Corrosion
The presence of crevices, almost unavoidable in practical constructions and operations, makes stainless steels more susceptable to corrosion in chloride enviroments. 2507 is highly resistant to crevice corrosion. The critical crevice corrosion temperatures of 2507 and several other high-performance stainless steels are shown above.
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