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SKH59 Application:W-phase system high-speed tool steel
Category Type Steel grade Standard Country
Grades Special Alloy SKH59 JIS Japan

Chemical composition % of the ladle analysis of grade SKH59

C(%) Si(%) Mn(%) Cr(%) Mo(%) V(%) W(%) Co(%)
1.05-1.15 Max 0.70 Max 0.40 3.50-4.50 9.00-10.00 0.90-1.30 1.20-1.90 7.50-8.50
SKH59
Mechanical properties of grade SKH59
Proof strength
Rp0.2 (MPa)
Tensile strength
Rm (MPa)
Impact energy
KV (J)
Elongation at fracture
A (%)
Reduction in cross section on fracture
Z (%)
As-Heat-Treated Condition Brinell hardness (HBW)
733 (≥) 398 (≥) 14 43 34 Solution and Aging, Annealing, Ausaging, Q+T,etc 241
Physical properties of grade SKH59
Property Density
kg/dm3
Temperature T
°C/F
Specific heat
J / kgK
Thermal conductivity
W/mK
Electric resistance
µΩ·cm
Modulus of elasticity
kN/mm2
Expansion rate
582 (≥) 463 (≥) 21 41 41 Solution and Aging, Annealing, Ausaging, Q+T,etc 123
Temp.
°C/°F
Creep strain limit
(10000h)
(Rp1,0) N/mm2
Creep rupture strength
(10000h)
(Rp1,0) N/mm2
419 299 588
SKH59 Range of products
Product type Products Dimension Processes Deliver Status
Plates / Sheets Plates / Sheets 0.08-200mm(T)*W*L Forging, hot rolling and cold rolling Annealed, Solution and Aging, Q+T, ACID-WASHED, Shot Blasting
Steel Bar Round Bar, Flat Bar, Square Bar Φ8-1200mm*L Forging, hot rolling and cold rolling, Cast Black, Rough Turning, Shot Blasting,
Coil / Strip Steel Coil /Steel Strip 0.03-16.0x1200mm Cold-Rolled & Hot-Rolled Annealed, Solution and Aging, Q+T, ACID-WASHED, Shot Blasting
Pipes / Tubes Seamless Pipes/Tubes, Welded Pipes/Tubes OD:6-219mm x WT:0.5-20.0mm Hot extrusion, Cold Drawn, Welded Annealed, Solution and Aging, Q+T, ACID-WASHED

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