|
发表于 2010-8-20 21:45:14
|
显示全部楼层
来自: 中国辽宁大连
SF20T(product of Shimomura Tokushu Seiko Co., Ltd.) is used as standard lens holder material# b$ w- D0 j% m; W
in our products.
. V- ]) p+ _' g: }. y( K/ SThis is developed to improve anticorrosion of SUS430(ferritic stainless steel) and has achieved8 E& i( {1 W1 j) e9 i0 G. Q
anticorrosion near SUS304 by 20%Cr-2%Mo.$ K& m9 z& P" {6 [. D' @
Currently, it is near SUS444, but is not applied to JIS(Japanese Industrial Standard) steel grade.. L$ \# n! \) V& _$ u4 F: z/ U. s! D
SF20T is free-cutting stainless steel of low-carbon ferritic series.
+ a* T- A- d2 Y: f$ _; F7 ^* h! i7 wCharacteristic
$ C: _ I. [! o3 F* I) Y" z* [9 d ☆Machinability
# `) ]6 E7 D4 E6 r! | SF20T has an equivalent or greater machinability than JIS SUM24L(heavy free-cutting) and7 Y( K' x2 A; h% x
near at brass.
# Y8 p3 Z: \5 R* w# P* e/ K ☆Anticorrosion
/ x6 d2 Q3 E' K0 A# ZIn usual atomosphere, the anticorrosion is the order of bellow.2 V T8 h" i8 Z+ s' E
High SUS304>SF20T=SUS303>SUS430 Low." _+ i2 x- h2 G8 K l9 g
And SF20T has an enough anticorrosion.% {* f% J. X% O1 j' [+ r# l
☆Magnetic characteristic
0 F- W$ w8 J0 g* R: B SF20T which have high permeability and low coercive force, can be used as an electromagnetic! ?0 i! ]# z* j9 u: x7 `% w/ {1 _# W
stainless steel.
' s# r6 o* l& u9 ~5 I ☆Cold processing (Caulking)
. x4 j2 g% c' R i Cold processing of SF20T is more excellent than SUS303.9 m$ o9 [6 ^; M( a6 `; @
☆Welding- C9 j4 t3 z$ k) f* u3 _
Welding of SF20T is inferior to SUS304 for added free-cutting ingredient.+ ^/ h% }' J* b# S$ g
However, SF20T is many used to the brazing and spot-welding.
- d# F+ d! |& X1 r( Y$ bAnd it is not problem at the plasma-welding test. |
-
|