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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
3 m# v4 J. c# Q1 b8 Y9 [4 fin our products." }4 R. Q6 ?# p$ @+ b
This is developed to improve anticorrosion of SUS430(ferritic stainless steel) and has achieved% c2 ^& B; u' d$ x
anticorrosion near SUS304 by 20%Cr-2%Mo.
% _5 r- |- E* d9 rCurrently, it is near SUS444, but is not applied to JIS(Japanese Industrial Standard) steel grade.' n1 C. A+ c/ a" e" R
SF20T is free-cutting stainless steel of low-carbon ferritic series./ V" O9 G! ^: z0 I; E
Characteristic- h3 I( P4 O' D7 k6 Y+ T4 ~
☆Machinability
n7 v. A2 [+ W0 J- }& Q9 `& v SF20T has an equivalent or greater machinability than JIS SUM24L(heavy free-cutting) and; M/ ^9 X7 d/ W, n
near at brass.
# ^( i2 {0 v: O1 N ☆Anticorrosion" l( L+ b" b1 v: G, ^: |6 z
In usual atomosphere, the anticorrosion is the order of bellow.' B2 \ `8 E3 \- K0 d, l9 A' N# G
High SUS304＞SF20T=SUS303＞SUS430 Low.0 `4 [- s4 l% K4 v- u
And SF20T has an enough anticorrosion.
; m2 S( s" t! e% j: d5 t9 B& y ☆Magnetic characteristic% T2 r( T5 E) K' s
SF20T which have high permeability and low coercive force, can be used as an electromagnetic
/ T) P: }% |# J3 ?% b; R; g( ~2 Kstainless steel.
8 j1 i6 d5 z' E( c: Y ☆Cold processing (Caulking) R n' X8 ^- z; L1 r6 ]$ v
Cold processing of SF20T is more excellent than SUS303.
8 r& c' ~. L7 f. W0 G5 ?4 b1 Y/ K6 N ☆Welding
* o3 _& k5 X+ I% D! h, T _ Welding of SF20T is inferior to SUS304 for added free-cutting ingredient.
$ g0 c7 i4 n& o& f6 C' |8 gHowever, SF20T is many used to the brazing and spot-welding.2 R+ ~& Z- ]6 i- D! }; ~
And it is not problem at the plasma-welding test. |
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