|
|
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
. p z" A! [* d* E+ |9 h& Fin our products.
9 D1 Z% n8 X) ^2 p; ^* \5 IThis is developed to improve anticorrosion of SUS430(ferritic stainless steel) and has achieved
8 |7 h2 q9 g- _7 E. tanticorrosion near SUS304 by 20%Cr-2%Mo.$ s4 u& b9 W2 p9 U+ K
Currently, it is near SUS444, but is not applied to JIS(Japanese Industrial Standard) steel grade.; O* M8 X; b$ F- ~$ l
SF20T is free-cutting stainless steel of low-carbon ferritic series.
- \3 C8 s% x2 f( z9 j9 bCharacteristic
2 V& x O( o5 K! o0 l1 E9 Y+ n ☆Machinability* B; O' L$ | y/ \2 s1 l- r9 U
SF20T has an equivalent or greater machinability than JIS SUM24L(heavy free-cutting) and1 E0 T8 D" ~( q! ?5 O
near at brass.
6 J: o, E; S) p* k% p6 f8 d$ ?! l ☆Anticorrosion# X" E* c, q3 T7 O
In usual atomosphere, the anticorrosion is the order of bellow.7 T2 P- Z) ^5 [- Z B( p& R3 u
High SUS304＞SF20T=SUS303＞SUS430 Low.7 ~9 ?2 b+ _ L" a( b2 ]/ j% {
And SF20T has an enough anticorrosion.
7 K) i- h# m! }% ]+ w6 g ☆Magnetic characteristic
2 k! J2 O0 Q3 f# g9 d1 K, u SF20T which have high permeability and low coercive force, can be used as an electromagnetic6 ?+ O; N* Y# L- ?
stainless steel.
* V4 \, H4 d% W G ☆Cold processing (Caulking)
/ \. S) y3 {- U- x Cold processing of SF20T is more excellent than SUS303.
7 L: k+ @# n- h4 W C# D) v% c ☆Welding
^, d6 A! W$ G% l Welding of SF20T is inferior to SUS304 for added free-cutting ingredient.: T( p! H. U. ]$ e
However, SF20T is many used to the brazing and spot-welding.
]- S% n( W) y' c) zAnd it is not problem at the plasma-welding test. |
-
|
