UNS N08926/X1NiCrMoCuN25-20-7/EN 1.4529/Incoloy 25-6Mo/Alloy 926 Stainless Steel

UNS N08926 is a high corrosion-resistant stainless steel with high contents of chromium and molybdenum and provides excellent corrosion resistance under severe environments such as high-temperature seawater and flue gas desulfurization plants.

Alloy 926 Mo (INCOLOY alloy 25-6MO, UNS N08926 / W. Nr. 1.4529) is a super-austenitic 6% molybdenum stainless steel that provides excellent resistance to a variety of highly corrosive environments. This alloy performs well in high chloride process streams were pitting, crevice corrosion and stress corrosion cracking may occur. It has excellent general corrosion resistance in sulfuric, phosphoric, and organic acids, especially when they contain chloride impurities.

The high chromium and nickel content of Alloy 926 Mo provides general corrosion resistance in both oxidizing and reducing environments. The combination of molybdenum and nitrogen resists pitting and crevice corrosion, while copper enhances resistance to sulfuric acid, and nitrogen increases tensile and yield strengths. 926 Mo can be utilized as a replacement for conventional austenitic stainless steels (316L, 317L) that fail due to pitting, crevice corrosion, or chloride stress corrosion cracking. The strength of 926 Mo is approximately 50% higher than 316L. 25-6MO Mo can be a cost-effective substitute for nickel alloys.

The following datasheet will provide more details about UNS N08926 (X1NiCrMoCuN25-20-7, EN 1.4529).

Available Form of Products:

Pipe & Tube: ASTM B677, ASTM B674, ASTM B673

Plate & Sheet & Strip: ASTM B625, ASTM A240, API 5LD

Bar, Billet: ASTM B472, NACE MR0175/ISO 15156

Wire: ASTM B649

Chemical Composition:

The following table shows the chemical composition of UNS N08926.

Element Content (%)
Iron, Fe 41.69 – 50.35
Nickel, Ni 24-26
Chromium, Cr 19-21
Molybdenum, Mo 6-7
Manganese, Mn ≤2
Copper, Cu 0.5-1.5
Silicon, Si ≤0.5
Nitrogen, N 0.15-0.25
Phosphorous, P ≤0.03
Carbon, C ≤0.02
Sulfur, S ≤0.01

Physical Properties

The physical properties of UNS N08926 are outlined in the following table.

Properties Metric Imperial
Density 8.03 g/cm³ 0.29 lb/in³

Mechanical Properties

The mechanical properties of UNS N08926 are outlined in the following table.

Properties Metric Imperial
Tensile strength ≥648 MPa ≥94000 psi
Yield strength ≥296 MPa ≥43000 psi
Modulus of elasticity 192 GPa 27800 ksi
Elongation at break ≥35 % ≥35 %
Rockwell B hardness ≤86 ≤86


The following are some of the major applications of UNS N08926:

  • Desalinization systems
  • Pulp and paper industry
  • Food processing equipment
  • Chemical processing plant
  • Offshore oil and gas production
  • Power generation