Mat.No. 1.2888, DIN X20CoCrWMo10-9
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Designation by Standards Mat. No. DIN EN AISI 1.2888 X20CoCrWMo10-9 - - Chemical Composition (in weight %) C Si Mn Cr Mo Ni V W Others 0.20 0.25 0.50 9.50 2.0 - - 5.50 Co: 10.0 Description Special high alloy hor work steel. Extreme retention of hardness; suitable for all applications where particular resistance to high temperature wear and melt of of metal is required. Applications Extrusion tools for copper, copper alloys and steel, including spcial dies, die casting tools of...
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Designation by Standards
| Mat. No. | DIN | EN | AISI |
| 1.2888 | X20CoCrWMo10-9 | - | - |
Chemical Composition (in weight %)
| C | Si | Mn | Cr | Mo | Ni | V | W | Others |
| 0.20 | 0.25 | 0.50 | 9.50 | 2.0 | - | - | 5.50 | Co: 10.0 |
Description Special high alloy hor work steel. Extreme retention of hardness; suitable for all applications where particular resistance to high temperature wear and melt of of metal is required. Applications Extrusion tools for copper, copper alloys and steel, including spcial dies, die casting tools of all kind for brass, goosenecks and chambers for magnesium die casting, ectrusion tools for steel. No water cooling. Physical properties (avarage values) at ambient temperature Modulus of elasticity [103 x N/mm2]: 215 Density [g/cm3]: 8.08 Soft Annealing Heat to 760-840oC, cool slowly in furnace. Time is 4-6 hours. This will produce a maximum Brinell hardness of 320. Stress Relieving Stress relieving to remove machining stresses should be carried out by heating to 600-650oC, holding for 1-2 hours at heat, followed by air cooling. This operation is performed to reduce distortion during heat treatment. Hardening Harden from a temperature of 1100-1150oC followed by air, oil quenching or vacuum quenching. Hardness after quenching is about 52 HRC. Tempering Tempering temperature: 600-750oC, to increase hardness, temper 2 or 3 times. Tempering Temperature (oC) vs. Hardness (HRC)
| 500oC | 550oC | 600oC | 650oC | 700oC | 750oC |
| 56 | 56 | 55.5 | 54 | 48 | 42.3 |
Tempering Diagram 
Click the image to enlarge the diagram. Diagram Tempering Temperature – Mechanical Properties 
Click the image to enlarge the diagram. Forging Hot forming temperature: 1100-900oC. Machinability No data. Forms manufactured: Please see the Dimensional Sales Program. 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 puposes. There is no representation that the recipient of this literature will receive updated editions as the become available.
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