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JIS SKT4 Tool Steel

JIS SKT4 Steel

Hot Work Tool Steel






Characteristic
Hot working die steel
Preserving the hardness when hot treatment
Good abrasion resistance
High ductility and abrasion resistance
Good hardness and hardenability
Insensitivity to temper brittleness because of the molybdenum in steel
Special Use: Mold Steel


Equivalent
Steel Classification
Standard
Assab
Bohler
Daido
Thyssen
Hitachi
DIN
JIS
AISI
Hot Work Steel
1.2344
SKD 61
H13
8407
W302
DHA1
2344
DAC
1.2714
SKT 4
L6
SOMDIE
W500
GFA
2714
DM
1.2367
-
-
QRO90
W303
-
2367
-
1.2767
-
-
Grane
K600
-
-
-
ASTM L6, EN 55NiCrMoV7, ASTM A681 L6, T61206, ISO 4957, BS 4659 BH224/5


Availability
Round Bar: Φ 12-410mm
Flat: 8-160*205-710mm
Mould: 200*200-1200*1000mm
Length: 1000-6000mm

Chemical Composition
Grade C Si S P Mn Cr V Mo
SKT4 0.50-0.60 0.10-0.40 0.005 0.025 0.60-0.90 0.80-1.20 0.05-0.15 0.35-0.55


Mechanical Properties
Properties SKT4
Annealing (°C): 500
Air cooling or furnace cooling (HB): 197-241
Quenching (°C) : 830-860
Oil cooling (HRC) : 53-58
Backfire 490-510°C : 41-47 HRC small-sized forging die
Backfire 520-540°C : 38-41 HRC medium-sized forging die
Backfire 560-580°C : 34-37 HRC large-sized forging die
Backfire 620-640°C : 34-37 HRC medium-sized forging die
Backfire 640-660°C : 30-35 HRC small-sized forging die


Physical Properties
Properties
SKT4
Density (×1000 kg/m3) 7.84
Modulus of elasticity (GPa) 190-210
Thermal conductivity (W/m.K) 36.0
Specific Heat (J/kg-K) 0.46
Electrical Resistivity (Ohm.mm2/m) 0.30
Poisson’s ratio 0.27- 0.30

Applications
Tool Steel Bar, 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.


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