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B770 20CT

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America ASTM B77020CT 通用铜铍合金砂型铸件 and Mechanical Properties, Chemical Element, Cross Reference.

Datasheet for: Metals: B77020CT / B770 20CT
Category Grade Standard Region/Area Standard Content
Metals B770 20CT ASTM B770 America 通用铜铍合金砂型铸件

Chemical composition(mass fraction)(wt.%) of the B770 20CT

Element Min Max Similar
Zn - 0.1000 -
Total Others - - -
Sn - 0.1000 -
Si 0.2000 0.3500 -
Pb - 0.0200 -
Ni - 0.2000 -
Fe - 0.2500 -
Cu - - -
Cr - 0.0900 -
Co 0.3500 0.7000 -
Be 1.9000 2.2500 -
Al - 0.1500 -

Mechanical Properties of steel grade B770 20CT

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)
315 (≥) 421 (≥) 32 33 21 Solution and Aging, Annealing, Ausaging, Q+T,etc 244

Physical Properties of steel grade B770 20CT

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 - -     0.14 -  
166 331 - 31.3 121   -  
549 - 23 11.2   131 333

Heat Treatment of steel grade B770 20CT

Heat treated : 1396°C - 1171°C

Technological Curves of steel grade B770 20CT

Cross Reference Table (Equivalent Grade) of B770 20CT

Grade Standard Country Application
ASTM 5140
AISI 201
AISI 202
1.2767
17-4PH
AISI 1052
AISI 416Se
AISI 1330
AISI 205 Stainless Steel
AISI A10
AISI A2
AISI A3
AISI A4
1.0036
1.0037
SAE J403
UNS G10100
AMS 4924
ASTM A36
Electrode 100S-1
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