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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) X. B' t: Y% L$ K+ K
in our products.
) O/ {0 t& ]7 r. ?( ?& [9 |) W4 pThis is developed to improve anticorrosion of SUS430(ferritic stainless steel) and has achieved" \. V8 `# T+ i% J
anticorrosion near SUS304 by 20%Cr-2%Mo.
5 A$ b: [- l) Z( N7 iCurrently, it is near SUS444, but is not applied to JIS(Japanese Industrial Standard) steel grade.
2 G: |' e2 p9 [$ K# e) I fSF20T is free-cutting stainless steel of low-carbon ferritic series.
" p7 K5 N6 s. q! sCharacteristic
% N" j3 M) @( d ☆Machinability
* J; q# p9 R1 H' p$ X! Q6 \. S' f) I SF20T has an equivalent or greater machinability than JIS SUM24L(heavy free-cutting) and4 y% d! l7 ?* K5 J, u' j
near at brass.
, C8 s: S* F o6 x5 e/ I2 C) E ☆Anticorrosion: I- S0 g7 d4 z# o2 C
In usual atomosphere, the anticorrosion is the order of bellow.6 a* U7 e# F5 k* [
High SUS304＞SF20T=SUS303＞SUS430 Low.7 s/ h, b, ^8 p a% f. C1 H
And SF20T has an enough anticorrosion.: H* V @- h1 E) L4 q
☆Magnetic characteristic& ^7 K( z. z7 I; l8 t
SF20T which have high permeability and low coercive force, can be used as an electromagnetic
7 Y4 y; R4 t& K8 F# ustainless steel.; b1 w! K2 S1 y" D& d P
☆Cold processing (Caulking)- d S7 Q4 T* C
Cold processing of SF20T is more excellent than SUS303.2 w) i# x/ W( s0 z# _
☆Welding3 z# R$ {, h4 W3 [& r- Q
Welding of SF20T is inferior to SUS304 for added free-cutting ingredient.
: v. L: `% ~0 o; [4 }5 k, mHowever, SF20T is many used to the brazing and spot-welding.
- Z8 g9 D) t: ]5 u8 r; F bAnd it is not problem at the plasma-welding test. |
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