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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
& r3 h9 X- k4 f: |, W0 ~' vin our products.7 l8 p) ]. B# p- H' ]: G; g; X
This is developed to improve anticorrosion of SUS430(ferritic stainless steel) and has achieved& V1 F" U1 y3 ]
anticorrosion near SUS304 by 20%Cr-2%Mo.
+ x# b' J( h: L7 ACurrently, it is near SUS444, but is not applied to JIS(Japanese Industrial Standard) steel grade.1 K& }0 [9 n( x2 M5 x
SF20T is free-cutting stainless steel of low-carbon ferritic series.8 B0 Y% z" B# O% {1 {- ^& J
Characteristic
0 Y" w2 r0 `0 N) u$ l: t ☆Machinability& o1 Q6 P7 k' ]
SF20T has an equivalent or greater machinability than JIS SUM24L(heavy free-cutting) and) ?/ a1 V+ Q# I5 j- l5 Q! W
near at brass.
! z7 J+ E! c, t8 u7 { ☆Anticorrosion6 `) m; p5 K, P; B3 `+ e
In usual atomosphere, the anticorrosion is the order of bellow.% F- o# B& s! i+ p. g
High SUS304＞SF20T=SUS303＞SUS430 Low./ [/ h8 B% q: z$ _) u$ I% v
And SF20T has an enough anticorrosion.( ]( T: U$ y1 G
☆Magnetic characteristic! X3 J8 O9 V' u/ b5 P" Z, g
SF20T which have high permeability and low coercive force, can be used as an electromagnetic5 u' e3 J3 U; A# g/ ]( d$ i6 Z
stainless steel.# l( n7 l' {, T% I8 j: b; q" [
☆Cold processing (Caulking)9 f, m5 D" B; I) w K
Cold processing of SF20T is more excellent than SUS303.; g. q$ `5 e5 I+ Y$ S
☆Welding5 [" Q6 V1 E3 g! f9 D/ U: `1 e
Welding of SF20T is inferior to SUS304 for added free-cutting ingredient.% T/ E" |5 F9 }' b
However, SF20T is many used to the brazing and spot-welding." o) P' N4 A* I( e ?$ F
And it is not problem at the plasma-welding test. |
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