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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
4 d0 t1 p8 n7 }9 |in our products.
7 h' V6 }% I) V# Q6 x6 ^This is developed to improve anticorrosion of SUS430(ferritic stainless steel) and has achieved
- Y$ E+ n$ g/ Q5 p1 ~anticorrosion near SUS304 by 20%Cr-2%Mo.
) G/ j1 A; k9 T# ZCurrently, it is near SUS444, but is not applied to JIS(Japanese Industrial Standard) steel grade.! F- T* ^5 ]! i" S
SF20T is free-cutting stainless steel of low-carbon ferritic series.
7 ?5 o6 P; P+ e0 I& x3 WCharacteristic
# o5 j6 F8 R! ?/ F ☆Machinability
# Q1 V! U9 }% u SF20T has an equivalent or greater machinability than JIS SUM24L(heavy free-cutting) and
1 j- D2 K8 R" g3 X+ [" Y* Qnear at brass.
* ]% Y& C7 q( b% C* v" K- ` ☆Anticorrosion
/ D( R8 l0 A8 e! |2 [In usual atomosphere, the anticorrosion is the order of bellow.
% _% I6 ~% B+ d. R" n& ~ High SUS304＞SF20T=SUS303＞SUS430 Low.: k" E1 ^3 |: e
And SF20T has an enough anticorrosion.
8 a E+ N" }8 \. B" t8 i% H ☆Magnetic characteristic% d" N& _, }$ i3 n% u4 ~
SF20T which have high permeability and low coercive force, can be used as an electromagnetic8 o$ @8 l3 @( ` H8 \5 ]" q
stainless steel.
: G$ f& w& a* |! Z/ P9 I, v3 W3 N ☆Cold processing (Caulking)
/ i1 B; |, o2 i& ^& o- }4 O7 O) K Cold processing of SF20T is more excellent than SUS303.
7 W* X) v) f0 j ^ G m9 K ☆Welding% i) ]# c- z! X% W
Welding of SF20T is inferior to SUS304 for added free-cutting ingredient./ K; A/ B. k2 V/ ~
However, SF20T is many used to the brazing and spot-welding.% [! {- T. L! L) ^2 B: F" |
And it is not problem at the plasma-welding test. |
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