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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. P* U. e6 S B' Q
in our products.
8 ?% A- P2 I1 E. LThis is developed to improve anticorrosion of SUS430(ferritic stainless steel) and has achieved
?% L5 O {( uanticorrosion near SUS304 by 20%Cr-2%Mo.' j& h+ R: h- s) q
Currently, it is near SUS444, but is not applied to JIS(Japanese Industrial Standard) steel grade.
. \% P: S5 f( a: D7 w3 vSF20T is free-cutting stainless steel of low-carbon ferritic series.
) k* d c9 [. g0 R: J- bCharacteristic
$ w- P( ?& F/ ?$ [3 u+ G ☆Machinability
& N; H1 y" H; K2 P8 C/ w5 H SF20T has an equivalent or greater machinability than JIS SUM24L(heavy free-cutting) and
1 j3 A |* E X4 [9 Z* G- ?near at brass.3 c9 \7 U- l. Y/ d1 A# g
☆Anticorrosion
- j5 c- m# W* Q J( _! jIn usual atomosphere, the anticorrosion is the order of bellow.
: r+ @. e b3 o9 { High SUS304＞SF20T=SUS303＞SUS430 Low.9 T, s) V& {0 @6 p% W, I) V: h
And SF20T has an enough anticorrosion.
6 j7 U5 p' x, C/ \; u ☆Magnetic characteristic, s3 H8 {5 j" M' B! J3 E e9 u
SF20T which have high permeability and low coercive force, can be used as an electromagnetic
0 S/ ]& d% q3 O5 o7 u5 Tstainless steel.- X, s% Y) e! _, y+ V+ P0 s/ j
☆Cold processing (Caulking)
, w) W b& g& P8 R3 l Cold processing of SF20T is more excellent than SUS303., S7 `1 E! w' d. P4 F
☆Welding0 v% O6 b! H5 U K/ a( L [
Welding of SF20T is inferior to SUS304 for added free-cutting ingredient.5 b, s& ?- ]; H& | X! i
However, SF20T is many used to the brazing and spot-welding.& a& C' P+ H5 K
And it is not problem at the plasma-welding test. |
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