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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: @9 c' I& w7 b# z
in our products.
# ]+ h' q7 }8 [7 Y" nThis is developed to improve anticorrosion of SUS430(ferritic stainless steel) and has achieved
: f' ?; u! S# l& ^0 r" ?& n$ U! ]anticorrosion near SUS304 by 20%Cr-2%Mo.% N; O `7 z$ V$ V
Currently, it is near SUS444, but is not applied to JIS(Japanese Industrial Standard) steel grade.
& }; I7 |/ e7 Y- t. u7 ~ D9 OSF20T is free-cutting stainless steel of low-carbon ferritic series.
+ ~. H: }0 H& w8 z1 a( ICharacteristic% ?6 _: Y* L+ S8 E% x n" ]
☆Machinability$ C, m$ k. D) `1 Z% L1 m
SF20T has an equivalent or greater machinability than JIS SUM24L(heavy free-cutting) and5 V$ H% v# q1 g9 o/ V3 ^' w5 o
near at brass.7 c/ Z4 x& U, T( _$ E; @( F
☆Anticorrosion
& A9 {7 B# c2 @% i6 [In usual atomosphere, the anticorrosion is the order of bellow.
( o- B. w- J, k High SUS304＞SF20T=SUS303＞SUS430 Low.
+ c$ K% W! D5 o5 z" u; u# ~- l' x1 l6 yAnd SF20T has an enough anticorrosion.: C$ \( D7 k$ [3 R$ _" y2 s2 |
☆Magnetic characteristic2 f ^- E- y2 ]. Y
SF20T which have high permeability and low coercive force, can be used as an electromagnetic" U; k' @! x* V8 t }( y
stainless steel.
8 t( b3 |0 t$ |7 F7 B ☆Cold processing (Caulking): C q, ~4 p; U6 e
Cold processing of SF20T is more excellent than SUS303.0 a) T' ]" G% E9 H, H: Q8 p
☆Welding
, M! V, c# S& M+ N' J Welding of SF20T is inferior to SUS304 for added free-cutting ingredient.
" Q5 }( R9 W8 `& OHowever, SF20T is many used to the brazing and spot-welding.2 P1 z: E$ j* F6 u0 I
And it is not problem at the plasma-welding test. |
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