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发表于 2010-8-20 21:45:14
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来自： 中国辽宁大连
SF20T(product of Shimomura Tokushu Seiko Co., Ltd.) is used as standard lens holder material
+ F4 `: {7 X& Cin our products.
$ v# i; F4 p% g0 YThis is developed to improve anticorrosion of SUS430(ferritic stainless steel) and has achieved" L+ u6 d- W& T/ t
anticorrosion near SUS304 by 20%Cr-2%Mo.
3 e H9 F: u! rCurrently, it is near SUS444, but is not applied to JIS(Japanese Industrial Standard) steel grade.1 n% f) j. R5 Z3 m" P* Z
SF20T is free-cutting stainless steel of low-carbon ferritic series.
' j) Z: b; _, l& T1 q7 ?5 A6 CCharacteristic2 q5 `2 Z* ]2 K
☆Machinability
+ ~! S9 ]/ m* Q( j( @ SF20T has an equivalent or greater machinability than JIS SUM24L(heavy free-cutting) and
' f0 V3 ]6 A4 @# [7 Inear at brass.! D* N3 Z0 S. T4 ~; d& N6 Z; e, s
☆Anticorrosion
% ]# t; I: j, ^0 ~. \In usual atomosphere, the anticorrosion is the order of bellow.
) m* N( Y: {& Z% x( W+ w- { High SUS304＞SF20T=SUS303＞SUS430 Low.
. A, U# a5 P6 M: CAnd SF20T has an enough anticorrosion., W z: p. V6 [# ?- M% N
☆Magnetic characteristic
7 ^( r6 [! P7 v/ s U+ ]8 a2 S SF20T which have high permeability and low coercive force, can be used as an electromagnetic$ w; d$ z) h' l P1 l/ g7 u# G
stainless steel.1 P) B& b' m8 K* M/ i/ D, k+ W
☆Cold processing (Caulking)
, T, ?/ f& k7 E. V* l* U m) l Cold processing of SF20T is more excellent than SUS303.
: p" n7 W6 s5 ~# Y ☆Welding
7 ?5 o! s/ Y6 w' r Welding of SF20T is inferior to SUS304 for added free-cutting ingredient.
& w/ Y, h9 M! {! B, w6 NHowever, SF20T is many used to the brazing and spot-welding.
& k+ }/ n# X1 VAnd it is not problem at the plasma-welding test. |
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