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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- s, v u/ k; S- J( r, X% v- A: e
in our products.
. ]+ {/ l" {9 b) [This is developed to improve anticorrosion of SUS430(ferritic stainless steel) and has achieved4 ]) K n8 e8 p; ]' |
anticorrosion near SUS304 by 20%Cr-2%Mo.
" e0 w$ Q$ n1 V0 E9 ^7 E7 ]Currently, it is near SUS444, but is not applied to JIS(Japanese Industrial Standard) steel grade.
# B+ H, n9 }, M1 Q3 m. S! KSF20T is free-cutting stainless steel of low-carbon ferritic series.9 ~% S K' o g+ ?6 f7 q( M
Characteristic
s8 C$ _4 m& k: } ☆Machinability! w/ C2 [8 P3 }6 u
SF20T has an equivalent or greater machinability than JIS SUM24L(heavy free-cutting) and& h) [, y0 q2 q0 q
near at brass.7 x; J& f$ ^ X: ]! i9 [& i4 g
☆Anticorrosion
9 D6 M/ ~4 ?& v/ D8 gIn usual atomosphere, the anticorrosion is the order of bellow.2 o" @' ^8 T6 q
High SUS304＞SF20T=SUS303＞SUS430 Low.- [0 ] P( ?6 F1 N; }& c
And SF20T has an enough anticorrosion.8 b+ c4 }6 N) i |% X* f$ A- v
☆Magnetic characteristic K- x# [* j6 c- j: f
SF20T which have high permeability and low coercive force, can be used as an electromagnetic
! }/ i: D$ C3 S lstainless steel.
: p# v' ^# \0 f" B. r$ `9 u ☆Cold processing (Caulking)0 S: V* [3 C3 Z8 g" |6 _
Cold processing of SF20T is more excellent than SUS303.
) \+ F9 T% G: L, T; X& f( f ☆Welding
0 F* G) ~6 a8 T$ e( {: a v Welding of SF20T is inferior to SUS304 for added free-cutting ingredient.* ^5 x. i4 R/ J1 l$ a9 M
However, SF20T is many used to the brazing and spot-welding.% r Q" M: `+ ^9 h2 D) O
And it is not problem at the plasma-welding test. |
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