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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 material9 {1 Z$ u# v$ m7 ?3 k) P! s
in our products.
8 ]/ g3 J" T! l9 S* }This is developed to improve anticorrosion of SUS430(ferritic stainless steel) and has achieved
- r3 X; V- @/ ]8 banticorrosion near SUS304 by 20%Cr-2%Mo.* [1 F1 q$ g* R3 x. B. Y
Currently, it is near SUS444, but is not applied to JIS(Japanese Industrial Standard) steel grade.
" _, v& Y9 f f4 ASF20T is free-cutting stainless steel of low-carbon ferritic series.
; M" v* ^. d& R' e) r, ICharacteristic
8 P6 X# X& a: J: Y& B" B7 f! `! G% _1 y ☆Machinability
' t" A) p9 S, I6 ?0 k SF20T has an equivalent or greater machinability than JIS SUM24L(heavy free-cutting) and
; M! \$ C3 X3 H) Anear at brass.( \1 d- Q# k9 d; E8 S- s' Z
☆Anticorrosion
|: ~: H2 f0 o0 l& {In usual atomosphere, the anticorrosion is the order of bellow.% Q! _, x6 p2 [* _4 ]8 g8 E
High SUS304＞SF20T=SUS303＞SUS430 Low.5 L. C4 u. e/ p, ~) e
And SF20T has an enough anticorrosion.( @* J9 L0 T( P7 i5 O
☆Magnetic characteristic8 S& S6 P. G3 k* ~/ @; y/ E2 Y2 l0 D
SF20T which have high permeability and low coercive force, can be used as an electromagnetic
( Y ^* G4 x: E, I5 ` `stainless steel." _( N( O4 L" r O6 @* s. w
☆Cold processing (Caulking)6 k9 t" y% M* r& h1 p6 H; h
Cold processing of SF20T is more excellent than SUS303.7 Y3 P& u( q) c7 E3 Z* N k
☆Welding. t0 D8 K6 y2 {! l7 g5 ~7 b0 [9 K
Welding of SF20T is inferior to SUS304 for added free-cutting ingredient.: I( m8 [5 U( t7 t# ^" \8 X( H
However, SF20T is many used to the brazing and spot-welding.7 X4 x8 n3 q2 G) a( z/ d# _
And it is not problem at the plasma-welding test. |
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