AISI P20 + ni / 1.2738, DIN 40CrMnNiMo8-6-4
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Spécification, Chemical & Performance mécanique
esignation by Standards
| Marque | Ravne No. | Tapis. Non. | DIN | EN | AISI |
| UTOPNIN | 249 | 1.2738 | 40CrMnNiMo8-6-4 | - | P20 Mod. |
Composition chimique (en% en poids)
| C | Si | Mn | Cr | Mo | Ni | V | W | Autres |
| 0.40 | 0.30 | 1.45 | 1.95 | 0.20 | 1.05 | - | - | - |
Description
This steel is in the category generally labeled as Mold Steels. Nickel and chromium are the alloying elements for hardness and toughness. Cold work tool steel with good machinability, excellent polishability, suitable for texturing. Improved through hardenability comapred to Mat.No. 1.2311.Applications
Typically used for relatively low temperature applications such as die casting dies and injection molds, synthetic plastic moulds dies, for large moulds.Propriétés physiques (valeurs moyennes) à température ambiante
Module d'élasticité [103 x N / mm2]: 205
Densité [g / cm3]: 7.80
Conductivité thermique [W / mK]: 29.0
Capacité thermique spécifique [J / gK]: 0.46Coefficient de dilatation thermique linéaire 10-6oC-1
| 20-100oC | 20-200oC | 20-300oC | 20-400oC | 20-500oC | 20-600oC | 20-700oC |
| 11.7 | 12.3 | 13.0 | 13.3 | 13.7 | 13.7 | 14.0 |
Diagramme de transformation en refroidissement continu (CCT)
Recuit doux
Chauffer à 710-740oC, refroidir lentement. Cela produira une dureté Brinell maximale de 235.Stress Soulager
Stress relieving to remove machining stresses should be carried out by heating to 650oC, maintien pendant une heure à chaud, suivi d'un refroidissement par air. Cette opération est réalisée pour réduire la distorsion lors du traitement thermique.durcissement
Durcir à une température de 840-880oC followed by oil, air ot warm bath (180-220oC) quenching. Hardness after quenching is 52 HRC.Tempérer
Température de revenu: Voir les données ci-dessous.Température de revenu (oC) vs. Hardness (HRC) vs. Tensile Stregth (N/mm2)
| 100oC | 200oC | 300oC | 400oC | 500oC | 600oC | 700oC |
| 52 | 51 | 49 | 46 | 42 | 36 | 28 |
| 1790 | 1730 | 1620 | 1480 | 1330 | 1140 | 920 |
Diagramme de revenu
Forger
Température de formage à chaud: 1093-898oC.Usinabilité
Machinability is relatively good at about 80% that of the W group water hardening steels.Soudage
This alloy is weldable by conventional methods. Contact the alloy supplier for details and weld procedures.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
