AISI 304H & AISI 321H


AISI 304H & AISI 321H

Steel alloys with a higher carbon content inside them are characterized by the letter H following the grade.

Among our “stainless solutions” we offer 2 alloys that are increasingly used, AISI 304H and AISI 321H.


AISI 304H, compared to standard AISI 304, has a higher carbon content C≥0.04% which improves its resistance to high temperatures, as well as its resistance in acidic environments.

It is easily workable and weldable, which makes it a versatile material for various industrial applications. AISI 304H is therefore commonly used in high temperature applications such as ovens, heat exchangers, heat treatment systems and other applications where resistance to corrosion and high temperatures is required.

This grade is known in various nomenclatures as:

UNS S30409 – 1.4948
X5CrNi18-10, AISI 304H, Tp 304H, Type 304H

AISI 321H, also with a higher carbon content than the AISI 321 standard, is more appreciated for its greater weldability thanks to its physical structure.

Furthermore, due to its resistance to corrosion and high temperatures, it is preferred in case of aggressive environments. In fact, it is used in pressure vessels, boilers, and more generally in the chemical and petrochemical industry.

Its nomenclatures are:

Wr. 1.4878, AISI 321H, UNS S32109, ASTM A240


For both of these alloys, we can supply products in the form of pipes, fittings, flanges, but also “long” products such as rounds, plates, plates, and eventually sheets.


As with other products in our range, we can supply European production materials in case of origin restrictions.

If you want to find out about our other stainless solutions, click on the following link which will take you to the blog of our website, which is constantly updated.



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