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Introduction
UR 28(N08028)alloy is a super austenitic stainless steel with very high nickel (31%) and chromium (27%) contents. The molybdenum content is about 3.5%. The alloy is designed for specific purposes, including sulphuric and phosphoric acid applications.
It behaves particularly well in sulphuric and phosphoric acid environments, even when contaminated by chlorides and fluorides species. The high nickel content improves its stress corrosion cracking resistance.
The combined chromium and molybdenum additions contribute to drastically increase the localized corrosion resistance.
N08028 Alloy behaves much better than alloy 825 and could be considered in some applications (sour gas) to replace the more expensive 625 grade. The alloy is extensively used in chemical and offshore applications including very sour gas fields.
Specification:
ASTM B668 For Seamless tube and Pipes
ASTM B709 For hot rolled and cold Rolled Plate/sheet/Strip
Chemical components(%)
Composition | C | Si | Mn | P | S | Cr | Ni | Mo | Cu |
Min | \ | \ | \ | \ | \ | 26.00 | 30.00 | 3.00 | 0.60 |
Max | 0.03 | 1.00 | 2.50 | 0.03 | 0.03 | 28.00 | 34.00 | 4.00 | 1.40 |
Mechanical properties
Rigidity | Tensile strength | Yield strength | Elongation |
HB≤200 | ≥600MPa | ≥300MPa | ≥40% |
Physical properties
Density | Melting points | Specific heat | Magnetism | Resistivity | Thermal conductivity | Linear expansivity |
8.0g/cm3 | 1390-1420℃ | 455J/(Kg.℃） | \ | 1.0Ω·m(20℃) | 14.3W/(m.k)(100℃) | 15.6×10-6/K(0-100℃) |
Advantages
Corrosion resistance:N08028 Alloy has excellent corrosion resistance in both acidic and alkaline environments, especially in corrosive media such as sulfuric acid, hydrochloric acid, and chloride.
It can still maintain its corrosion resistance in high temperature environments and is suitable for work in high temperature corrosive media.
It has good resistance to stress corrosion cracking and is suitable for environments sensitive to stress corrosion cracking. Heat resistance:N08028 Nickel Chromium Alloy has good heat resistance and can work in high temperature environments. Its operating temperature range is -100℃ to 600℃. At high temperatures, Alloy 28 Alloy can still maintain good corrosion resistance and will not cause corrosion or deformation.
Applications
Production, concentration and use of phosphoric acid reactors tanks, impellers, piping systems, cyclone evaporators, surface coolers, circulation pumps, agitators, superphosphoric acid storage, shell/tubes for heat exchangers
Production and use of sulphuric acid: heating equipment, reactor tanks, agitators, inlet pipe in reactors...
Oil and gas production : sour gas application, tubing, separators...
Several offshore platform equipment
Chemical industry (acetic acid, vinyl chlorides)
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