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B.S. BT1 Details

W series high speed steel

B.S. BT1 Standard Download

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BT1 Application:W series high speed steel
Category Type Grade Designations
Grades Tool Steels & Die Steels BT1 UK - B.S. , BS 4659 - High speed tool steel
Chemical composition(mass fraction)(wt.%)
Elements Min.(≥) Max.(≤)
C 0.70 0.80
Si - 0.40
Mn - 0.40
Co - 1.00
Cr 3.75 4.50
Mo - 0.70
Ni - 0.40
V 1.00 1.25
W 17.5 18.5
Cu - 0.20
Sn - 0.05
Mechanical properties of grade BT1
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)
382 (≥) 575 (≥) 42 11 43 Solution and Aging, Annealing, Ausaging, Q+T,etc 141
Physical properties of grade BT1
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
275 (≥) 176 (≥) 21 21 13 Solution and Aging, Annealing, Ausaging, Q+T,etc 411
Temp.
°C/°F
Creep strain limit
(10000h)
(Rp1,0) N/mm2
Creep rupture strength
(10000h)
(Rp1,0) N/mm2
633 547 224
BT1 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
Cross Reference Table(Equivalent Grade)
Grade Standard Country Application
BT1 B.S. UK
W series high speed steel

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