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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
' s' v+ o2 S) ~8 U; iin our products.
% b7 a8 ]! X9 a% p4 a' ~5 M4 nThis is developed to improve anticorrosion of SUS430(ferritic stainless steel) and has achieved
1 T F$ J8 d/ K) `+ V+ K" uanticorrosion near SUS304 by 20%Cr-2%Mo.2 z; p/ Y% w' y9 S7 F/ o$ J
Currently, it is near SUS444, but is not applied to JIS(Japanese Industrial Standard) steel grade.' u0 ^6 b. B* ?: h
SF20T is free-cutting stainless steel of low-carbon ferritic series.
5 @/ p+ D) D0 v+ u& wCharacteristic1 }) X% S% j5 Q6 \
☆Machinability- }2 G8 n; T- ]+ m
SF20T has an equivalent or greater machinability than JIS SUM24L(heavy free-cutting) and) d% u% b: `' m' D
near at brass.
2 B7 f& U, W1 r! a4 ] ☆Anticorrosion
4 f- U0 N2 f, ?2 JIn usual atomosphere, the anticorrosion is the order of bellow.+ }. ^- B1 N# F, ~! m& A7 J2 i
High SUS304＞SF20T=SUS303＞SUS430 Low." }0 l7 L- w7 _2 g4 f" c( F
And SF20T has an enough anticorrosion.
0 D2 S! j N7 W ☆Magnetic characteristic$ ?/ V* W0 k: I& ~5 ] O& s
SF20T which have high permeability and low coercive force, can be used as an electromagnetic) K# Y# L2 t6 H' N
stainless steel.
0 o5 ?- d P% c# P( i4 ?, } ☆Cold processing (Caulking)
* W; U7 t& x& c: K0 o Cold processing of SF20T is more excellent than SUS303.8 I) ^. ~+ l8 j. K, i
☆Welding
' _% Y; f& v( S0 Z+ f Welding of SF20T is inferior to SUS304 for added free-cutting ingredient.; |5 o" b# i* Z" Y
However, SF20T is many used to the brazing and spot-welding.: p1 W) m/ R; V$ k- u- b5 S5 M
And it is not problem at the plasma-welding test. |
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