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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
4 @/ v; s& M9 z+ c# \in our products.8 U! A& c: }6 S1 @6 f; j, f1 J, J6 }
This is developed to improve anticorrosion of SUS430(ferritic stainless steel) and has achieved
" y+ R' M" a- U1 Danticorrosion near SUS304 by 20%Cr-2%Mo.( V0 F: I$ X/ d* Y v
Currently, it is near SUS444, but is not applied to JIS(Japanese Industrial Standard) steel grade.
7 F, i3 r( o" t3 @/ H# V8 WSF20T is free-cutting stainless steel of low-carbon ferritic series.6 q: K8 c" f0 D' U; P0 R
Characteristic
* h* m( j" @4 L! c! `- b ☆Machinability a! K0 O! }1 y. `
SF20T has an equivalent or greater machinability than JIS SUM24L(heavy free-cutting) and- R" f) c N: x5 @6 J8 K
near at brass.0 `* e9 U2 p- N( y$ m& w; J2 h% O
☆Anticorrosion
6 S9 U9 \1 u* M/ ]; \ iIn usual atomosphere, the anticorrosion is the order of bellow.2 V1 T9 K B9 A! o
High SUS304＞SF20T=SUS303＞SUS430 Low.+ M9 v. E' ~3 W( ^
And SF20T has an enough anticorrosion.# _, N5 Z! F8 \/ s( B' N
☆Magnetic characteristic
8 C+ g9 r$ Z* V; t SF20T which have high permeability and low coercive force, can be used as an electromagnetic
6 f& y9 d' y* [9 l0 pstainless steel." [3 [4 i, O' Z) n: {
☆Cold processing (Caulking)
6 ?% s: R" g) F# O- g- ^ Cold processing of SF20T is more excellent than SUS303.
9 Z; e @& Z) i* I0 L0 W ☆Welding
: q4 E- E9 a3 n0 L Welding of SF20T is inferior to SUS304 for added free-cutting ingredient.
8 z/ \ H5 C% g. A, s$ w6 eHowever, SF20T is many used to the brazing and spot-welding.4 t2 Z+ e( e3 b, j
And it is not problem at the plasma-welding test. |
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