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DIN 70Si7 Details

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70Si7 Application:Alloyed Si steel

Category Type Grade Designations
Grades Tool Die Steels 70Si7 Germany - DIN ,

Chemical composition(wt.%) of 70Si7 grade:

Elements Min.(≥) Max.(≤) Similar Remarks
C 0.65 0.75
Si 1.50 1.80
Mn 0.60 0.80
P - 0.030
S - 0.030
Cr - -
Mo - -
V - -
Alloyed Si steel

Mechanical properties of grade 70Si7

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)
758 (≥) 742 (≥) 23 14 11 Solution and Aging, Annealing, Ausaging, Q+T,etc 312

Physical properties of grade 70Si7

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
949 (≥) 844 (≥) 33 41 14 Solution and Aging, Annealing, Ausaging, Q+T,etc 323
Temp.
°C/°F
Creep strain limit
(10000h)
(Rp1,0) N/mm2
Creep rupture strength
(10000h)
(Rp1,0) N/mm2
858 289 559

70Si7 - Form of Supply

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

Cross Reference Table(Equivalent Grade)

Grade Standard Country Application
70Si7 DIN Germany
Alloyed Si steel

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