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AISI H21_1.2581 Hot Work Tool Steel

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              

Standard

Grade

AISI/SAE

H21

W.Nr/DIN

1.2581

JIS

SKD5

GB

3Cr2W8V


Chemical Composition (%)

C

Si

Mn

Cr

W

V

0.26-0.35

0.15-0.40

0.20-0.40

3.00-3.75

8.50-10.00

0.30-0.50

*1.2581 Cr:2.50 to 2.80, W:8.00 to 9.00


Hot Forming 

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.

Tempering  

400

500

600

700

HRC

50

51

49

35

* Hardening temperature: 1100, specimen size: dia50mm

 

Surface treatment

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   12-50mmhot rolled

Dia   50-600mmforged

Flat/Square:Thickness20-350mmhot forged

Width800mm max

 


Get quotation about tool steel H13 round/flat bars,plate and forged block,please contact us.

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