1.2379 vs DIN 1.2379: What Actually Changes on the Shop Floor

Requests for 1.2379 often arrive together with a request for the nearest equivalent grade. The two names are frequently treated as interchangeable, and in many applications they are. The differences appear when the part is large, the duty is severe or the surface finish matters.

The equivalent names

1.2379 is also sold as DIN 1.2379. Different standards bodies, different mills and different trade names describe the same family, so the first job is to agree which specification is actually being quoted.

Where the grades agree

Both descriptions share the same general character: hardened and tempered to 58 to 62 HRC. For blanking and piercing dies and trimming tools, a correctly made material to either name will normally perform the same way.

Where they differ

a high carbon high chromium grade with about 12 percent chromium and 1.5 percent carbon that provides excellent wear resistance in blanking and forming. That is the property that separates a properly specified purchase from a purchase made on price alone, and it is the first thing to verify on the mill certificate.

Choosing for your application

If the part is cold forming and roll tooling, the tighter specification is worth paying for. If the part is small, lightly loaded and replaceable, the difference will never be noticed in service.

Documentation to request

Ask for the carbide segregation rating and the amount of hot reduction. Wear resistance is limited by carbide quality, and poorly worked material chips even at the correct hardness. Put the requirement in the purchase order rather than in a covering email, because the order is the document that the mill and the inspection department will actually work to.

Hubei Keyspark Special Steel Co., Ltd. runs two 20-ton EAF furnaces, two 20-ton LF ladle furnaces, a 20-ton VD unit and a 5-ton ESR furnace, with open-die forging, 12 precision heat treatment furnaces, four vacuum annealing furnaces and over twenty machining centres. Annual capacity is about 15,000 tonnes.

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