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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% k0 Y# _4 ~1 l
in our products.; T% Q& S, X; n8 v3 j3 |& @
This is developed to improve anticorrosion of SUS430(ferritic stainless steel) and has achieved& P: n4 Z F& d5 N) B
anticorrosion near SUS304 by 20%Cr-2%Mo.4 S2 n6 ]4 J4 |- L
Currently, it is near SUS444, but is not applied to JIS(Japanese Industrial Standard) steel grade.3 d# H$ L+ I/ D& w
SF20T is free-cutting stainless steel of low-carbon ferritic series.
! k% {' j/ r9 ] E- f; mCharacteristic
8 f1 R/ P, r! `, j# s( {5 ?+ q ☆Machinability
" Y: W* @7 o9 ^- ~/ g; L SF20T has an equivalent or greater machinability than JIS SUM24L(heavy free-cutting) and/ o8 Z+ n, ]9 q3 y8 O* e
near at brass.
: B. s$ t, D1 c( I8 R ☆Anticorrosion/ s$ L- {( p$ \0 F/ S
In usual atomosphere, the anticorrosion is the order of bellow.
! Z$ i: D; E, {1 j1 O0 h High SUS304＞SF20T=SUS303＞SUS430 Low.% o% G! s9 ~+ ^! |. m
And SF20T has an enough anticorrosion.7 c; V# V9 ?% [" J) r8 G
☆Magnetic characteristic
8 Q6 d: {+ [& _. I SF20T which have high permeability and low coercive force, can be used as an electromagnetic2 h2 G' S+ u9 f6 @. V8 `5 g
stainless steel. n) X0 b, o- c" ]9 U( M2 @
☆Cold processing (Caulking)
% b5 N% q, M7 N% j Cold processing of SF20T is more excellent than SUS303.
, l' r. a, I9 d1 @ ☆Welding; ]6 e3 F* J0 f* i
Welding of SF20T is inferior to SUS304 for added free-cutting ingredient.
% q! |3 B. g& q: M, e( P% vHowever, SF20T is many used to the brazing and spot-welding.# a" y+ X/ \/ F
And it is not problem at the plasma-welding test. |
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