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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 O6 M7 M8 o2 K0 R6 n
in our products.9 {8 Q& X* i; l
This is developed to improve anticorrosion of SUS430(ferritic stainless steel) and has achieved
. S4 M, `6 [) u/ |& h) |anticorrosion near SUS304 by 20%Cr-2%Mo.0 I, B1 a7 N. C! M# D
Currently, it is near SUS444, but is not applied to JIS(Japanese Industrial Standard) steel grade.
2 L' c- a$ y+ B3 \ z! u" s; KSF20T is free-cutting stainless steel of low-carbon ferritic series.. x7 L( N* P) b* M
Characteristic
2 Z, D+ Q. w3 T ☆Machinability
9 n- t0 g% P- `% N$ ? SF20T has an equivalent or greater machinability than JIS SUM24L(heavy free-cutting) and
) Z4 s# w) i: L3 V6 Jnear at brass.9 y1 `+ K4 o% ~8 S7 y( b z
☆Anticorrosion/ c: U! m0 k% E. x
In usual atomosphere, the anticorrosion is the order of bellow.
W/ N: m; @; J, q4 x+ T6 l High SUS304＞SF20T=SUS303＞SUS430 Low.3 x) a* Q) x+ ]
And SF20T has an enough anticorrosion.9 _/ I" O; i; g
☆Magnetic characteristic
7 x7 i4 e- e3 i1 c1 J% T SF20T which have high permeability and low coercive force, can be used as an electromagnetic
% U& S# R" j/ V" hstainless steel.
7 [. k3 ~: _& ?- m1 ]2 a ☆Cold processing (Caulking)3 z1 a* L+ \" Y- N6 z9 z
Cold processing of SF20T is more excellent than SUS303.
4 v1 p2 V6 Z( A, F. x" r. G ☆Welding% A) I) X3 ^! l+ | {1 G
Welding of SF20T is inferior to SUS304 for added free-cutting ingredient.. t9 e }4 R" }" V$ u1 g: N/ }
However, SF20T is many used to the brazing and spot-welding.( H8 H9 {3 ^4 U+ H
And it is not problem at the plasma-welding test. |
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