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ASTM M7 Details

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M7 Application:High-Speed Tool Steel

Category Type Grade Designations
Grades Tool Die Steels M7 USA - ASTM ,

Chemical composition(wt.%) of M7 grade:

Elements Min.(≥) Max.(≤) Similar Remarks
C 0.97 1.05
Si 0.20 0.55
Mn 0.15 0.40
P - 0.030
S - 0.030
Cr 3.50 4.00
Mo 8.20 9.20
V 1.75 2.25
W 1.40 2.10
Co - -
High-Speed Tool Steel

Mechanical properties of grade M7

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)
595 (≥) 423 (≥) 31 32 41 Solution and Aging, Annealing, Ausaging, Q+T,etc 233

Physical properties of grade M7

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
155 (≥) 489 (≥) 12 41 11 Solution and Aging, Annealing, Ausaging, Q+T,etc 242
Temp.
°C/°F
Creep strain limit
(10000h)
(Rp1,0) N/mm2
Creep rupture strength
(10000h)
(Rp1,0) N/mm2
961 619 918

M7 - 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
SUS XM7 JIS Japan
Stainless steel bars
SUS XM7 JIS Japan
Hot-rolled stainless steel plates, sheet and strip
SUS XM7 JIS Japan
Cold-rolled stainless steel plate, sheet and strip
SUS XM7 JIS Japan
Stainless steel wire rods
SUS XM7 JIS Japan
Stainless steel wires
SUS XM7-WSA JIS Japan
Stainless steel wires for cold heading and cold forging
SUS XM7-WSB JIS Japan
Stainless steel wires for cold heading and cold forging
STSXM7 KS Korea
Stainless steel bars
STSXM7WSA KS Korea
Stainless steel wires for cold heading and cold forging
STSXM7WSB KS Korea
Stainless steel wires for cold heading and cold forging
XM7 CNS China
Stainless steel wire rods
M7 ASTM USA
High-Speed Tool Steel

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