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BT1 chemical information,mechanical properties, physical properties, mechanical properties, heat treatment, and Micro structure, etc. It also contains the use of BT1

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B.S. BT1

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This page is mainly introduced the BT1 chemical information,mechanical properties, physical properties, mechanical properties, heat treatment, and Micro structure, etc. It also contains the use of BT1,such as it is commonly used in bars, sheet,plates, steel coils, steel pipes,forged and other materials application.
W series high speed steel

Steel Garde:BT1
Type:Tool Die Steels
Country:UK
Standard:B.S.
Standard Number:

ITEM Standard Number Descriptions

1 BS 4659 High speed tool steel
Application:W series high speed steel

ITEM	Standard Number	Descriptions
1	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

Tensile strength	211～823	σb/MPa
Yield Strength	772	σ 0.2 ≥/MPa
Elongation	29	δ5≥(％)
ψ	-	ψ≥(％)
Akv	-	Akv≥/J
HBS	404～261	-
HRC	30	-

Physical Properties

Thermal expansion	11-32	e-6/K
Thermal conductivity	46-76	W/m.K
Specific heat	450-460	J/kg.K
Melting temperature	7725-7758	째C
Density	5596-4587	kg/m³
Resistivity	0.50-0.60	Ohm.mm²/m

Heat Treatment Regime

Annealing	Quenching	Tempering	Normalizing	Q & T
√	√	√	√	√

Size Availability

Steel Grade	Specification	Processing range(mm)
BT1 Tool Die Steels	Round Bar and Hollow Bar	Φ1 to Φ2000
	Square and Flat Steel	Φ10 to Φ100
	Plate and Sheet	0.08-800(Thickness)10-1500(Width)Length
	Tube or Pipe	OD:Φ4-410; WT:1-35 mm; Lenght:10-12000
	Coil and Strip Steel	THK:0.1mm Width:1500mm
	Forged	Ring/Cylindrical/Disk