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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: Q, _+ _# t. Q+ X
in our products.
5 Z; O7 n! x: _- x, o* f0 rThis is developed to improve anticorrosion of SUS430(ferritic stainless steel) and has achieved% l. Q( @: L1 G# d' Q: g% l
anticorrosion near SUS304 by 20%Cr-2%Mo., B' D# L% X$ K! r4 N- j( ~- \, D# Y
Currently, it is near SUS444, but is not applied to JIS(Japanese Industrial Standard) steel grade.' M1 \" X9 L# z, M: C
SF20T is free-cutting stainless steel of low-carbon ferritic series.
, L( _2 R# v$ N4 `' DCharacteristic |3 Y7 O- j5 i# z
☆Machinability
/ U( D. O4 \4 W" B# b SF20T has an equivalent or greater machinability than JIS SUM24L(heavy free-cutting) and
$ y1 F+ J \% ]; J0 m0 r) ]! q# Xnear at brass.
& z; U9 {0 H4 c8 @$ {) w ☆Anticorrosion
# l: @ z+ g% ]) V# U0 oIn usual atomosphere, the anticorrosion is the order of bellow.
( b) o& d, }1 u1 R High SUS304＞SF20T=SUS303＞SUS430 Low.
; `8 I8 U: B2 @0 H3 r" r7 O/ i0 o9 v& NAnd SF20T has an enough anticorrosion.9 c; @3 O; X' \- K, r, ]
☆Magnetic characteristic+ Z2 J# Z) G! H' ^& k* k
SF20T which have high permeability and low coercive force, can be used as an electromagnetic
# J3 _5 G* R. H" [- L7 C) n5 X cstainless steel.
$ }8 \/ Q$ V, D8 T( m3 O ☆Cold processing (Caulking)
& `$ y9 t3 p9 J/ h2 @ Cold processing of SF20T is more excellent than SUS303.. K5 d5 I/ S# o8 t9 M; j7 D
☆Welding# i9 t" P' P; X/ p9 J
Welding of SF20T is inferior to SUS304 for added free-cutting ingredient.! z: h- s; q* t( I+ n" M) O q" O/ U
However, SF20T is many used to the brazing and spot-welding.
+ R: B6 v- z6 jAnd it is not problem at the plasma-welding test. |
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