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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
; d* m8 V+ V5 ]4 G7 G8 L: Yin our products.
5 _- p3 H4 e& ?/ m$ o3 l$ s+ ~- }This is developed to improve anticorrosion of SUS430(ferritic stainless steel) and has achieved
. Y2 `) ?) |4 B7 J9 g* T+ qanticorrosion near SUS304 by 20%Cr-2%Mo.
z5 b1 d5 m I# sCurrently, it is near SUS444, but is not applied to JIS(Japanese Industrial Standard) steel grade.
1 ?5 Y5 p! [% K2 |! ?SF20T is free-cutting stainless steel of low-carbon ferritic series.! d$ o `3 _6 e- \; F# C
Characteristic
7 e! W8 ~5 v# p" r! _* t$ k. `7 A ☆Machinability$ M* u3 k; k. ?) u% x q
SF20T has an equivalent or greater machinability than JIS SUM24L(heavy free-cutting) and5 Q. {4 O8 Y' z R
near at brass.
5 U" g+ u9 B% y) A) {2 v+ W ☆Anticorrosion6 k5 k. F& \2 [& [) @) Z: n" R5 R
In usual atomosphere, the anticorrosion is the order of bellow.# b8 l# I2 b8 g$ r
High SUS304＞SF20T=SUS303＞SUS430 Low.
9 X2 |$ c3 `- G4 e4 zAnd SF20T has an enough anticorrosion.
9 U0 w, ^+ j4 E& X ☆Magnetic characteristic
! r5 ~8 z3 b$ U4 w1 e5 [, m SF20T which have high permeability and low coercive force, can be used as an electromagnetic
0 I" I7 H. q1 F4 ^% b* p& pstainless steel./ D7 I+ u3 H- y0 K1 t/ V) J" Q3 a
☆Cold processing (Caulking)8 R# o% K* S, i3 ^3 R
Cold processing of SF20T is more excellent than SUS303.- n4 j6 b& J' Q
☆Welding
& c1 F7 ?8 n2 G+ ]5 F5 Y( s Welding of SF20T is inferior to SUS304 for added free-cutting ingredient.+ f( ^2 q8 p; X" M% t' Z
However, SF20T is many used to the brazing and spot-welding.
( l; Y/ G8 o+ cAnd it is not problem at the plasma-welding test. |
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