CE8MN Duplex stainless steel


CE8MN overview

CE8MN Castings are a great option for difficult scenarios. Thanks to the combination of toughness, strength, and corrosion resistance, especially localized corrosion resistance, duplex steels are extremely suitable for oil & gas as well as petrochemical industries.

They are stronger and more resistant to localized phenomena such as crevice corrosion, pitting corrosion, and stress corrosion cracking than austenitic stainless steels, especially at low temperatures. It is stronger and more resistant to local corrosion phenomena such as crevice corrosion, pitting corrosion, and stress corrosion cracking than austenitic stainless steel, especially at low temperatures, it is stronger and tougher than ferritic stainless steel, tougher and more resistant to corrosion.

NJXS has firmly established itself as an industry leader in the manufacture of duplex alloy castings, specifically those designed for use in harsh environments such as seawater, cryogenics, or other corrosive conditions. Our team of experts is always available to work with your organization to create a custom-tailored product that meets your exact needs and specifications.

Characteristics of astm a890 a995 2a ce8mn stainless

  • In comparison to ASTM A890 CD3MN duplex steel, CE8MN is a superior material option with enhanced strength and corrosion resistance. In fact, its PREN value is higher than 38, showcasing its remarkable performance in tough environments.
  • 904L steel is already renowned for its superior corrosion resistance, however, compared to 904L, ASTM A890 2A has an even higher level of resistance to corrosion caused by the combination of dilute sulfuric acid and chloride ions. This makes it a great choice for industries that require highly resistant materials in harsh environments.
  • It has a higher yield strength and lower ductility than austenitic stainless steels, which makes it a more reliable material in applications that require increased mechanical strength without compromising on ductility or formability.
  • CE8MN super duplex steel is renowned for its impressive combination of strength, corrosion resistance, and high impact strength, making it an ideal alloy for a wide range of industrial applications. 

  • Not suitable for use at temperatures above 570°F or 300°C as prolonged exposure to such environments will result in reduced toughness.

Application of a890 a995 2a ce8mn stainless steel

CE8MN(A890 A2) duplex stainless steel is a high-performance alloy that is widely used in various industries due to its excellent mechanical and corrosion resistance properties.

  • Oil and Gas:  manifolds, pumps, valves, risers,  flowlines, pipes.
  • Pulp and Paper: pressure vessels, roller, digesters, liquor tanks.
  • Chemical engineering:  heat exchangers, distillation  agitators, pressure vessels, condensers, columns,  marine chemical tankers
  • Renewable energy: Biogas tanks
  • Mobility: iron ore wagons, tank trucks,  tramcars, and bus frames.
  • Engineering: valves, pumps,  springs, fittings, 
  • Architecture and Infrastructure
  • Water: desalination plants,  wastewater treatment, large tanks for water storage.

Chemical composition:

Carbon:                                                      0.08%MAX

Manganese:                                                1.0%MAX

Silicon:                                                         1.5%MAX

Phosphorus:                                             0.04%MAX

Sulfur:                                                        0.04%MAX

Chromium:                                               22.5–25.5%

Nickel:                                                           8.0–11.0%

Molybdenum:                                              3.0–4.5%

Nitrogen:                                                     0.1–0.30%

Spectral analysis CE8MN chemical composition
Physical Propertie test rod of CE8MN
Physical Propertie test rod of CE8MN

Physical Properties:

Cited properties of materials are suitable and applicable for both the normalized and tempered conditions.


Tensile strength, ksi[MPa], min                            100[690]

Yield strength (0.2% offset), ksi[MPa], min         65[450]

Elongation in 2 in.(50mm), %                                  25 

Reference standard

CE8MN material equivalent

ACI-ASTM CE8MN steel is a duplex stainless steel designed specifically for casting:

ASTM: A890 2A

ASME: SA890 2A

Type: 24Cr-10Ni-Mo-N

UNS – Cast: J93345


Wrought UNS: S32750

Heat Treatment Requirements:

To achieve desired results, castings must be heated to a minimum temperature of 2050°F (1120°C) and held for an appropriate duration to ensure the casting is uniformly heated throughout. Quenching in water or any other rapid cooling method should then be used to rapidly cool the casting, resulting in increased material strength, improved ductility, and toughness minimized potential for microstructural defects, and improved performance of the final product.