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发表于 2010-5-12 15:07:19
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Spec. Thickness Comment 9 h4 s! J3 ~& M# \; Z- w6 s! j2 y
ASTM-B-! [3 F9 U& h6 e% ~8 Z
545-97e1 ASTM requires purchaser to supply information, such as base metal, underplating, test requirements and test methods etc. In general, copper alloys containing more than 5% Zn shall have a copper undercoating of at least 0.0001" or nickel undercoating of at least 0.000050". 0 Y# q5 V' e# P/ ?& j8 _. J
Class A .0001" min 1 u. c3 r, a6 ^4 w
Class B .0002" min 8 o2 b+ w9 `4 q. f- N& `$ b. }1 d+ g
Class C .00032" min .0004" min. for steel. 4 D- F9 E9 l' M! m
Class D .0006" min .0008" min. for steel. 2 Q3 \# F# m3 o
Class E .0012" min ASTM requires purchaser to supply information, such as base metal, underplating, test requirements and test methods etc. In general, copper alloys containing more than 5% Zn shall have a copper undercoating of at least 0.0001" or nickel undercoating of at least 0.000050".
# {5 K0 O3 U5 y7 YType Matte
+ @8 F. ~0 Q& I, N, D$ e6 S6 HType Bright
; U7 ~* }, n' Q; r) Q) ^Type Flow-
" T" W& `' Q8 E3 obrightened ----------- Flow brightening available
; f* u) R4 `3 Y* _% C最少0.00032 英寸，就是 8微米 |
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