Choosing 1.2379 for blanking and piercing dies

Selecting 1.2379 for blanking and piercing dies is a decision about failure modes. Every tool and every component fails in a particular way, and the steel should be chosen to resist that specific mechanism rather than to maximise a property that does not matter.

The service conditions

blanking and piercing dies typically involves a combination of mechanical load, abrasion and temperature cycling. The dominant mechanism decides whether wear resistance, toughness or thermal stability should lead the specification.

Why this grade fits

1.2379 is specified because 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. In practice it is supplied hardened and tempered to 58 to 62 HRC, which is the condition in which the property balance was designed to work.

Where it is not the best choice

If the part is lightly loaded and made in large numbers, a lower cost steel will usually give the same service life. If the part is cold forming and roll tooling under extreme conditions, a remelted or higher alloyed grade may be justified.

Design and machining notes

Radii, fillets and generous transitions reduce stress concentration and are free. Sharp internal corners are the most common cause of premature cracking in trimming tools, and no steel specification can compensate for them.

Life cycle cost

Compare the cost of the steel against the cost of the downtime, not against the cost of a cheaper grade. For blanking and piercing dies the material is usually a small fraction of the total cost of a failure.

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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