Products Features
Excellent resistance to hydrogen sulfide stress corrosion cracking.
In acidic oil and gas well environments containing H₂S, INCOLOY 028 exhibits outstanding resistance to sulfide stress corrosion cracking (SSC), meeting the requirements of the NACE MR0175 / ISO 15156 standard for metallic materials used in acidic environments.
Excellent resistance to pitting and crevice corrosion.
The synergistic effect of high chromium, molybdenum, and nitrogen endows the alloy with superior pitting resistance equivalent (PREN > 40) in chloride-containing environments, making it suitable for harsh corrosive conditions such as seawater, brines, and acidic salt solutions.
Good mechanical properties and workability
It has moderate strength and excellent ductility, allowing it to be cold and hot worked, formed, and welded using conventional processes. It is suitable for manufacturing complex components such as oil well pipes, heat exchangers, valves, and piping systems.
Corrosion resistance stability over a wide temperature range
It maintains stable corrosion resistance in acidic media from ambient temperature to high temperatures, and is particularly suitable for acidic gas and liquid environments ranging from low temperatures up to around 200°C.
Technical Specifications
Chemical Composition
|
Element |
Standard Requirements |
Notes |
|
Ni |
30.0 - 34.0% |
Matrix elements that provide resistance to chloride ions and acidic media |
|
Cr |
26.0 - 28.0% |
Provide antioxidant and corrosion resistance capabilities, enhancing the stability of the passivation film |
|
Fe |
remaining quantity |
Structural support to reduce costs |
|
Mo |
3.0 - 4.0% |
Significantly improve resistance to pitting corrosion and crevice corrosion |
|
Cu |
0.6 - 1.4% |
Enhance the corrosion resistance to reducing acids (such as sulfuric acid) |
|
C |
≤ 0.03% |
Strict control to prevent intergranular corrosion |
|
Si |
≤ 1.0% |
Oxygen absorber |
|
Mn |
≤ 2.0% |
Deoxidizer, improve hot working properties |
|
P |
≤ 0.03% |
Impurity elements |
|
S |
≤ 0.03% |
Prevent hot brittleness |
Physical Properties
|
Property |
Value/Range |
Test Conditions |
|
Density |
8.0 g/cm³ |
Room temperature (20°C) |
|
Melting Point |
1350 - 1400°C |
- |
|
Coefficient of Thermal Expansion (20-100°C) |
14.0 × 10⁻⁶ /K |
- |
Mechanical Properties (Annealed Condition, Typical Values)
|
Property |
Typical Value |
Specification |
|
Tensile Strength |
≥ 690 MPa |
ASTM B668 / B709 |
|
Yield Strength (0.2% Offset) |
≥ 310 MPa |
ASTM B668 / B709 |
|
Elongation |
≥ 40% |
ASTM B668 / B709 |
|
Hardness |
≤ 85 HRB |
- |
High-temperature performance
Meets the highest level requirements of NACE MR0175 / ISO 15156 for acidic oil and gas field environments, with no SSC sensitivity under conditions of pH 2.5-4.0 and H₂S partial pressure up to 1 bar.
Pitting Corrosion Resistance: PREN (Pitting Resistance Equivalent) = %Cr + 3.3×%Mo + 16×%N ≈ 40, which exhibits excellent pitting corrosion resistance in chloride-containing environments.
Applicable corrosive media:
Acidic oil and gas well media containing H₂S/CO₂
Chloride solutions (seawater, brine)
Reducing acids (dilute sulfuric acid, phosphoric acid)
Alkaline solution
Organic acids
Application Fields
-
Acidic oil and gas wells: tubing, casing, downhole tools, liners
-
Surface and downhole valves: valve body, stem, seals
-
Acidic medium handling equipment: heat exchangers, vessels, piping systems
-
Chemical processing equipment: reactors, distillation columns, evaporators
-
Flue Gas Desulfurization (FGD) systems
-
Offshore engineering: seawater pipelines, pumps and valves, heat exchangers
-
Refineries: high-sulfur crude oil processing units
-
Geothermal power generation: geothermal well casings and related equipment
-
Pharmaceutical equipment (specific medium environments)
-
Food processing equipment (high chloride ion cleaning environments)
Delivery and Customization
We offer flexible and reliable supply chain solutions to ensure you receive INCOLOY 028 materials that perfectly match your project requirements.
|
Form |
 Sheet/Plate
|
 Bar/Rod
|
 Seamless Pipe
|
 Strip/Sheet Coil
|
 Wire/Wire Rod
|
|---|---|---|---|---|---|
|
Conventional Range |
Thickness: 0.5 - 100 mm |
Diameter Φ6-500mm |
Outer diameter Φ10-300mm |
Thickness: 0.1 – 3.0 mm |
Diameter Φ0.5-10mm |
|
Customization Capability |
Special thick/thin rolling, ultra-wide plates; special surface treatment, fixed-length cutting |
Large-sized forged bars (up to Φ800 mm), special-shaped bars, and various heat treatment conditions |
Large-diameter thick-walled pipes, special alloy composition; Pipe end processing (beveling, fixed length) |
Different hardness conditions, special heat treatments (stabilization treatment, grain size control), acid-washed surfaces, electrolytic polishing, coatings, or special protective films |
Special surface treatment, precision drawing |
Why Choose Us? - Reliable engineering technology. Dependable delivery.
We are not just a supplier, but a trusted materials partner for you in China.
Vertically Integrated Production
Own 20,000㎡ facility with 10+ automated lines (8,000+ tons/year). In-house tooling & die center enables rapid customization and effective cost control - no middleman markup.
Strict Quality Control at Every Stage
Full traceability across key QC checkpoints throughout production. 100% compliant with ASTM/ASME, EN, and GB standards. Material test reports available with every shipment.
Reliable Delivery & Export Packaging
10+ years exporting to Europe, North America, Southeast Asia & Middle East with waterproof and anti-rust protection, combined with flexible shipping options ensures safe and on-time arrival.
Sample Validation Before Mass Production
We provide free samples for quality verification, allowing you to place bulk orders only after approval. We ensure consistency from sample to mass production by accurate dimensional measurement and transparent manufacturing.
FAQ
Q: What are the main advantages of INCOLOY 028?
Q: What kind of heat treatment does INCOLOY 028 require?
Q: What is the maximum operating temperature?
Q: What is the difference between INCOLOY 028 and 825?
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