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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
. k ^" p* ~$ ^( B% C& o* cin our products.5 W" [$ F; L1 H" Z
This is developed to improve anticorrosion of SUS430(ferritic stainless steel) and has achieved& y; v) o0 W V- S* `
anticorrosion near SUS304 by 20%Cr-2%Mo.
; T6 B% ?% i5 [" a- d7 {) jCurrently, it is near SUS444, but is not applied to JIS(Japanese Industrial Standard) steel grade.
. H, u1 ?8 d$ K1 C8 Z* XSF20T is free-cutting stainless steel of low-carbon ferritic series.8 e2 k' E; x+ G9 l8 u# H) Q
Characteristic
) c* [7 X# O! Y; N+ o0 m- h; V ☆Machinability, B6 F# R- m' @; j q
SF20T has an equivalent or greater machinability than JIS SUM24L(heavy free-cutting) and0 I. X: |) ]" R4 H1 O7 T
near at brass.
, T( |3 P5 T6 A m8 C+ c ☆Anticorrosion% x/ `8 X0 Y! `/ `/ r0 j7 B
In usual atomosphere, the anticorrosion is the order of bellow.3 _7 I. j) a+ F5 |9 s
High SUS304＞SF20T=SUS303＞SUS430 Low.4 c/ k$ Y2 o- R- m- q( q: m
And SF20T has an enough anticorrosion.# c7 ~& d. [% P' u1 P
☆Magnetic characteristic+ R* Z9 ^( {; v! Y
SF20T which have high permeability and low coercive force, can be used as an electromagnetic7 R* k6 m& E& y) C
stainless steel./ I% {; u W2 Q5 r, W. v
☆Cold processing (Caulking)$ o1 f+ A5 E0 r
Cold processing of SF20T is more excellent than SUS303.
7 O% D# M( K: P+ d5 Q" O ☆Welding
8 p" G7 [7 ]+ z* ^, d Welding of SF20T is inferior to SUS304 for added free-cutting ingredient.
C- @8 ^2 J' l L0 ]However, SF20T is many used to the brazing and spot-welding.
/ n) W- P E7 t. ]! J8 [( y) wAnd it is not problem at the plasma-welding test. |
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