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EN 1.4424 (X2CrNiMoSi18-5-3) Stainless Steel
Date:2024-04-09 15:04:18View:168Tags:Nickel Alloy Supplier

1.4424, also known as X2CrNiMoSi18-5-3, is a high-alloy stainless steel whose chemical composition has been carefully formulated to achieve outstanding performance. Specifically, the carbon content of this material is controlled below 0.02%, the silicon content is between 0.60% and 1.00%, and the manganese content does not exceed 2.00%. Phosphorus and sulfur content are also limited to less than 0.045% and 0.030% respectively. As for the key alloying elements, chromium ranges from 17.00% to 19.00%, nickel ranges from 4.50% to 5.50%, and molybdenum ranges from 2.50% to 3.00%.

Chemical composition % of steel X2CrNiMoSi18-5-3 (1.4424):EN 10088-2-2005

Elements not listed in this table shall not be intentionally added to the steel without the agreement of the purchaser except for finishing the cast.










max   0.03

1.4 - 2

1.2 - 2

4.5 - 5.2

max   0.035

max   0.015

18 - 19

2.5 - 3

0.05 - 0.1

Mechanical properties of steel X2CrNiMoSi18-5-3 (1.4424)

Rm - Tensile strength (MPa) (+A)


Rm - Tensile strength (MPa) (+AT)


Rp0.2 0.2% proof strength (MPa) (+A)


Rp0.2 0.2% proof strength (MPa) (+AT)


KV - Impact energy (J) longitud.,


A - Min. elongation at fracture (%) (+A)


A - Min. elongation at fracture (%) (+AT)


  Brinell hardness   (HB):   (+A)



When we delve deeper into the machining properties of X2CrNiMoSi18-5-3 rods, we find that they perform extremely well. This material is not only suitable for cold processing, but also for hot processing. In terms of cold working, its cutting performance is excellent, making high-speed cutting and high-precision processing possible. In terms of hot processing, due to its good plastic deformation ability, it can be processed through various methods such as forging, rolling, and extrusion.


The advantages of X2CrNiMoSi18-5-3 rod are not only reflected in its machining performance. First of all, it has excellent corrosion resistance and can be stably used in a variety of acids, alkalis, salts and other media, and is not prone to corrosion and oxidation. Secondly, the high-temperature strength and heat resistance of this material are equally excellent, allowing it to maintain stable performance in high-temperature environments and not prone to deformation and softening. In addition, X2CrNiMoSi18-5-3 also exhibits excellent fatigue resistance and can operate stably for a long time under repeated loading and cyclic stress.


The heat treatment process has a significant impact on the mechanical properties of 1.4424. By precisely controlling parameters such as heating temperature, holding time, and cooling rate, the material's organizational structure can be adjusted to optimize its mechanical properties. For example, proper heat treatment can increase the hardness, strength and toughness of the material while maintaining its good corrosion resistance and high temperature performance. This makes X2CrNiMoSi18-5-3 have broad application prospects in different fields, especially aviation, aerospace, chemical industry and marine engineering.


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