Hot work tool steel H21 / 1.2581 ---- hot work tool steel for oil or air hardening to develop high hot strength, retention of hardness, and heat checking resistance.
Equivalent Grade of AISI H21
Chemical Composition (%)
*1.2581 Cr:2.50 to 2.80, W:8.00 to 9.00
Forging: 1100 to 900℃, slowing cooling in furnace.
Heat Treatment of Hot Work Steel H21 / 1.2581
Annealing: 750 to 800℃, slow cooling in furnace (10-20℃/hr), down to approx. 600℃, cooling in air. Hardness after annealing: max. 240 HB.
Stress relieving: 600 to 650℃, slow cooling in furnace. Hold in neutral atmosphere for 1 to 2hours.
Hardening: 1070 to 1150℃, oil, salt bath 500 to 550℃, air. Hold 15 to 30 minutes. Hardness, 48 to 52 HRC, in oil or salt bath; 44 to 48 HRC in air.
Tempering: 550 to 700℃. Slowly heating to tempering temperature right after hardening. Recommended to temper 2 or 3 times to increase toughness.
* Hardening temperature: 1100℃, specimen size: dia50mm
Nitriding: suitable for both bath or gas nitriding.
Properties of Hot Work Steel H21 / 1.2581
Outstanding high temperature strength and tempering resistance, and high temperature wear resistance.
Applications of H21 / 1.2581 Steel
Tools exposed to strong thermal stress, such as dies, die holders, dummy blocks, mandrels etc. for the extrusion of copper and copper alloys; hot stamping dies for copper and copper alloys.
|Available Size of H21 / 1.2581 Steel|
|Round：||Dia 12-50mm||hot rolled|
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