1.2714 55NiCrMoV7 SKT4 alloyed hot work tool steel
1. Applications:
Forging dies of all types, hammer forging dies up to largest dimensions, tools for tube and rod extrusion such as rams, bolsters, mandrels, plungers, sleeves, die holders, backing plates, chipping beds, press dies for mould parts, deep engraving dies, containers for die casting presses, hot forming dies, bending and heavy embossing tools, hot mill rolls, hammers and pile drivers, hot punching tools, very hard cold work dies and punches, hot shear blades, blocks for dies, forging
saddles, pressing spindles, shrink rings, armoured trim dies, hydro forming tools, plastic moulds, hot gripper and heading dies.
2. Chemical analysis:
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C
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Si
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S
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P
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Mn
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Cr
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V
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Mo
|
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0.50~0.60
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0.10~0.40
|
0.005
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0.025
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0.60~0.90
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0.80~1.20
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0.05~0.15
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0.35~0.55
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3. Mechanical Properties:
Cr-Ni-Mo alloyed hot work tool steel with high temperature impact toughness and thermal fatigue strength, resistant to repeated shocks, high resistant to tempering, medium wear resistance, oil and air hardening with good through harden-ability, low P and S content, polishable. Suitable for pitting and chrome plating. This grade is produced on request annealed or quenched and tempered condition.
4. Compared grades, based on usage:
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American
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German
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Japanese
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EN
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ASTM
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DIN
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JIS
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ISO 4957
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L6
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1.2714
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SKT4
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55NiCrMoV7
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5. Condition of delivery:
1. Soft annealed to max 248 HB
2. Quenched and tempered, 1100-1350MPa.
6. Available sizes:
Round Bar: Φ 12-410mm
Flat: 8-160*205-710mm
Mould: 200*200-1200*1000mm
Length: 3000-12000mm
Mill deliver conditions, or sawing or cutting for customer request.
7. Physical properties:
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Temperature [oC]
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20-100
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20-300
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20-500
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20-600
|
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Thermal expansion [10-6.K-1]
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12.3
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13.4
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14.1
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14.4
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|
Temperature [oC]
|
20
|
350
|
700
|
|
|
Heat conductivity [W.m-1.K-1]
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35.9
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38.2
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34.8
|
|
8. Heattreatment:
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Recommended temperatures for heat processing
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Hardness
|
||
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Soft annealing:
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Temperature [oC]
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Cooling
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max. 248 HB
|
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650-700
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Furnace
|
||
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Annealing after decreasing stress:
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Temperature [oC]
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Cooling
|
|
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600-650
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Furnace
|
||
|
Hardening and tempering:
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Temperature [oC]
|
Hardening
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Tempering
|
|
840-890
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Oil, pressure gas (N2), air, vacuum, warm bath
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see tempering
diagram
|
|
Hardness after quenching :
52 - 58 HRC, Oil
44 - 50 HRC, Air
