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Mat.No. 1.2581/DIN X30WCrV93/AISI H21

This alloy is one of the hot work, tungsten containing tool steels. The tungsten content is beneficial for hot strength at red heat, although toughness is somewhat reduced.
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  • Mat.No. 1.2581/DIN X30WCrV93/AISI H21

This alloy is one of the hot works, tungsten containing tool steels. The tungsten content is beneficial for hot strength at red heat, although toughness is somewhat reduced.

Designation by Standards

Mat. No.DINENAISI
1.2581X30WCrV93X30WCrV9-3H21


Chemical Composition (in weight %)

CSiMnCrMoNiVWOthers
0.300.250.302.85--0.409.00-

Applications 

Used for hot working dies and tooling such as die casting, extrusion and hot forming of parts. Pressure die casting tools, molds for Cu and Cu-alloys. This grade is not used for water cooled tools.  

Physical properties (avarage values) at ambient temperature 
Modulus of elasticity [103 x N/mm2]: 190-210  
Density [g/cm3]: 7.80 
Thermal conductivity [W/m.K]: 27.0  
Electric resistivity [Ohm mm2/m]: 0.52 
Specific heat capacity[J/g.K]: 0.46 

Coefficient of Linear Thermal Expansion 10-6 oC-1

20-100oC20-200oC20-300oC20-400oC20-500oC20-600oC20-700oC
11.512.012.212.512.913.013.5


Soft Annealing
Heat to 780-810
oC, cool slowly. This will produce a maximum Brindle hardness of 240. Stress Relieving Stress relieving to remove machining stresses should be carried out by heating to 650oC, holding for one hour at heat, followed by air cooling. This operation is performed to reduce distortion during heat treatment. 

Hardening
Harden from a temperature of 1080-1160
oC followed by air, oil or warm bath quenching. Hardness after quenching is 47-53 HRC. 

Tempering Temperature (oC) vs. Hardness (HRC)

400oC500oC550oC600oC650oC700oC
494951504636


Forging
Hot forming temperature: 1150-926oC.

Machinability
The tungsten content makes H21 somewhat difficult to machine. As compared to the W group of water hardening low alloy steels rated at 100% for machinability the H21 would rate 55%.

Corrosion Resistance
This is a steel alloy and does not have corrosion resistance. It will rust unless given protective treatment.


Welding
This alloy may be welded. Consult the supplier for details. Manufacturing form: please refer to size sales plan.

Disclaimer
The information and data presented herein are typical or average values and are not a guarantee of maximum or minimum values. Applications specifically suggested for material described herein are made solely for the purpose of illustration to enable the reader to make his own evaluation and are not intended as warranties, either express or implied, of fitness for these or other purposes. There is no representation that the recipient of this literature will receive updated editions as the become available.


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