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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
- B2 c3 l6 Q8 w9 ~ \ \in our products.
$ D! F( l% N( V! XThis is developed to improve anticorrosion of SUS430(ferritic stainless steel) and has achieved
4 L8 j% b' A' T8 f$ q nanticorrosion near SUS304 by 20%Cr-2%Mo.+ v& ]& f1 _5 s
Currently, it is near SUS444, but is not applied to JIS(Japanese Industrial Standard) steel grade.
6 A( W1 P0 y, ^! o4 x9 hSF20T is free-cutting stainless steel of low-carbon ferritic series.1 {4 `5 I: V% t; |) x. t" `
Characteristic
" x5 m' i0 T2 ]/ M% R) m ☆Machinability
# |; V6 O0 F0 ^8 Z SF20T has an equivalent or greater machinability than JIS SUM24L(heavy free-cutting) and
1 L4 d' k1 i* P8 Lnear at brass.! n: r `* N7 K. H8 d& A
☆Anticorrosion
" \# F: S& B: t$ K: J1 R/ SIn usual atomosphere, the anticorrosion is the order of bellow.
9 D$ ~& |+ C7 I7 I3 P" z High SUS304＞SF20T=SUS303＞SUS430 Low.# t2 r2 X) Q# u8 C ?) _5 B
And SF20T has an enough anticorrosion.- ]1 M4 B: q1 e; n/ L" s
☆Magnetic characteristic. X1 a$ t. Y% Y2 K4 i! b$ F
SF20T which have high permeability and low coercive force, can be used as an electromagnetic
. k$ w6 ~: ?& p! Ystainless steel.4 q2 h; y8 }: z
☆Cold processing (Caulking), z* L+ ~3 ~ l% E# N l
Cold processing of SF20T is more excellent than SUS303.
# ~- Y2 T% `( x6 B$ s5 q ☆Welding! R/ T1 x+ l* y8 J
Welding of SF20T is inferior to SUS304 for added free-cutting ingredient.
6 S% \4 a% Z) p7 }, bHowever, SF20T is many used to the brazing and spot-welding.
; K2 W z; M0 r/ D# C6 @And it is not problem at the plasma-welding test. |
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