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BT21

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BT21 BT42
#BT21

Description

UK BT21 Carbide for cutting tools and BT21 Mechanical Properties, Chemical Element, Cross Reference, Datasheet.

Datasheet for: Steel Grades:Tool Steel And Hard Alloy: BT21
Category Type Steel Grade Standard Country Application
Steel GradesTool Steel And Hard Alloy BT21 UK Carbide for cutting tools
BT4
BT6
BT6
BT15
BT15
BT20①
BT20①
BT20①
BT20①
BT21

Chemical composition(mass fraction)(wt.%) of the BT21

C(％) Si(％) Mn(％) Cr(％) Ni(％) Mo(％) V(%) W(%) Co(%) Other(%)
0.60-0.70 ≤0.40 ≤0.40 3.50-4.25 ≤0.40 ≤0.70 0.40-0.60 13.5-14.5 ≤1.00 Cu≤0.20,Sn≤0.05

Mechanical Properties of steel grade BT21

Yield
Rp0.2 (MPa)		 Tensile
Rm (MPa)		 Impact
KV/Ku (J)		 Elongation
A (%)		 Reduction in cross section on fracture
Z (%)		 As-Heat-Treated Condition Brinell hardness (HBW)
956 (≥) 323 (≥) 43 24 32 Solution and Aging, Annealing, Ausaging, Q+T,etc 211

Physical Properties of steel grade BT21

Temperature
(°C)		 Modulus of elasticity
(GPa)		 Mean coefficient of thermal expansion 10-6/(°C) between 20(°C) and Thermal conductivity
(W/m·°C)		 Specific thermal capacity
(J/kg·°C)		 Specific electrical resistivity
(Ω mm²/m)		 Density
(kg/dm³)		 Poisson’s coefficient, ν
22 - -     0.43 -  
437 874 - 31.3 243   -  
338 - 42 31.2   431 112

Heat Treatment of steel grade BT21

Heat treated : 1986°C - 1991°C

Technological Curves of steel grade BT21

Cross Reference Table (Equivalent Grade) of BT21

Grade Standard Country Application
BT21 UK Carbide for cutting tools
BT21 UK Carbide for cutting tools
BT21 BT42
Available Suppliers
Jiangyou Longhai Special Steel Co.,Ltd.
Jiangyou Longhai Special Steel Co.,Ltd.

Our main peoducts of steel are many kinds of special steel, like tool steel, mould steel, alloy steel, alloy constructural steel, heat-resistant steel, high speed tool steel,spring steel and bearing steel , stainless steel and so on, which have formed 12 series and more than 350 varieties with n...

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