UNS N08535 Round Bar, sometimes called Alloy 8535 or 2535, is an advanced superaustenitic alloy created specifically for harsh oil field and downhole conditions. The alloy, which consists of nickel, iron, chromium, and molybdenum, offers stable properties under HPHT well conditions and H₂S-containing corrosive environment. UNS N08535 round bars are produced in the solution-annealed state in order to ensure necessary properties. In case of sour service application, materials can be supplied qualified to NACE MR0175 / ISO 15156 standard. In addition, chemical and mechanical test certificates, as well as EN 10204 3.1 MTCs, are available. Amardeep Steel supplies UNS N08535 Round Bars for demanding oilfield service requirements.
Technical Data
Specifications of UNS N08535 Round Bar
Attribute | Detail |
|---|---|
Primary Grade | UNS N08535 |
Common / Trade Name | Alloy 8535 / 2535 |
Governing Standards | Material chemistry and mechanical properties conform to ASTM B622 / ASME SB-622 and ISO 13680 standards. (Note: As no separate formal ASTM specification exists exclusively for bar product forms of this specialty grade, round bar stock is manufactured to ASTM B622 chemistry and property limits with mill-agreed bar tolerances). |
Sour Service Qualification | NACE MR0175 / ISO 15156 (Type 4c Alloy) |
Supply Condition | Solution Annealed |
Diameter Range | 10 mm to 300 mm (custom forged sizes available on request) |
Certification | EN 10204 3.1 MTC, NABL lab reports, Third-Party Inspection (TPI) |
Chemical Compositions of UNS N08535 Round Bar
Ni | Cr | Mo | Cu | Fe | Mn | Si | C | P | S |
|---|---|---|---|---|---|---|---|---|---|
29.0 – 36.5 | 24.0 – 27.0 | 2.5 – 4.0 | 1.50 max | Balance | 1.00 max | 0.50 max | 0.03 max | 0.03 max | 0.03 max |
Mechanical Properties of UNS N08535 Round Bar
Property | Tensile Strength (Rm) | Yield Strength (0.2% Offset) | Elongation (A5) |
|---|---|---|---|
Minimum Value | 503 MPa (73,000 psi) | 214 MPa (31,000 psi) | 40% |
Typical Mill Actuals | 550 – 620 MPa (79,800 – 89,900 psi) | 260 – 310 MPa (37,700 – 44,900 psi) | 46% – 52% |
UNS N08535 Round Bar Physical Properties
Property / Parameter | Value (Metric / Imperial) |
|---|---|
Density | 8.03 – 8.07 g/cm³ (0.290 – 0.291 lb/in³) |
Solidus (Melting Onset) | 1,370 °C (2,500 °F) |
Elastic Modulus | 195 – 200 GPa |
Poisson's Ratio | 0.28 – 0.29 |
Thermal Conductivity | 13 W/m·K |
Thermal Expansion | 16 µm/m·K |
Specific Heat | 470 J/kg·K |
Equivalent Grades of UNS N08535 Round Bar
UNS | Common / Trade Name | Pipe & Tube Standard | International Standard | Sour Service Qualification |
|---|---|---|---|---|
N08535 | Alloy 8535 / 2535 | ASTM B622 / ASME SB-622 | ISO 13680 | NACE MR0175 / ISO 15156 (Type 4c) |
Applications and Industrial Uses of UNS N08535 Round Bar
- Oil and Gas Downhole Equipment
- HPHT Well Components
- Sour Gas Service Equipment
- Oilfield Drilling Components
- Downhole Completion Tools
- Subsurface Safety Valves
- Wellhead and Christmas Tree Components
- Oilfield Production Equipment
Frequently Asked Questions
What is UNS N08535 Round Bar?
UNS N08535 Round Bar is a nickel-iron-chromium-molybdenum alloy bar designed for demanding oilfield and downhole applications.
What is UNS N08535 also known as?
UNS N08535 is also known as Alloy 8535 or Alloy 2535.
What is Alloy 2535 used for?
Alloy 2535 is used for oilfield equipment, downhole components, and sour-service applications.
What are the main properties of UNS N08535?
It offers high strength, excellent corrosion resistance, and resistance to aggressive sour-service environments.
Is UNS N08535 suitable for sour service?
Yes, it is designed for demanding sour-service environments containing hydrogen sulfide (H₂S).
What is the NACE MR0175 / ISO 15156 rating of UNS N08535?
UNS N08535 can be qualified for sour service according to NACE MR0175 / ISO 15156, subject to applicable conditions.
What is the hardness limit of UNS N08535 for sour service?
The applicable hardness limit depends on the material condition, product form, and NACE requirements specified for the service.
Can UNS N08535 be used in HPHT wells?
Yes, UNS N08535 is developed for demanding high-pressure, high-temperature (HPHT) oilfield and downhole environments.
