|
|
发表于 2008-3-23 08:19:55
|
显示全部楼层
来自： LAN
英國標准
4 t' U( L3 e# Z$ NEN39B Case hardening steel, a) P" r8 q7 o+ l P
C Si Mn Ni Cr Mo S P
( U# L/ m9 c _4 b% E9 C(Ave. values %) 0.15 0.25 0.4 4.2 1.2 0.25 0.025 0.025/ f4 J8 ]* Z" Z- K/ ~1 H! I
AS DIN BS2 y( E* y, w& |7 C% y" w
NEAREST
) R. j. C2 I! k. D- c8 H6 T* FSTANDARD X9315 1.6723 835 M 15- Z8 o' r2 h Y( x! \, N5 y3 [
& ^) p y1 _ e2 @" S* d! h( t8 FDESCRIPTION m5 U& U7 X8 R; J
4¼% Nickel Chromium Molybdenum case hardening steel for large and highly
2 s' o" ^5 h7 F) Z$ k! J. nstressed applications.
! @! V. _( U8 t4 U2 e5 P8 n# m& P4 W! P E- `3 z1 Y9 D
APPLICATIONS S& T* Q) ?( p0 L p
Components with large cross sections requiring very high toughness and core strength (1300 MPa) such as gears, gear shafts and heavy duty gear shafts in aircraft, truck construction and mechanical engineering.
* U) U8 U0 g; V6 @
) @3 `' ?) J$ q; B9 w8 i* aMECHANICAL PROPERTIES Heat Treated Condition" P L7 y% _/ I% ^/ R0 X
Tensile Strength MPa 1310
* Y0 d2 _ j y2 I' cElong.% 12
4 h p' S j3 e# KIzod Impact J 33' a2 O! P( f) h- d8 y. P( O
Brinell Hardness Annealed 277max
8 b O3 t2 ~, b4 T. n b
) t) w2 R \3 s. T: u: mHEAT TREATMENT
{3 |. g' G* J9 @7 RForge 850-1050oC. Cool in furnace.7 F7 l" u# a8 \# t% z: P5 S, p
Normalize 850-880oC. Air cool.
0 ?" @/ b4 ], z% p9 U2 A2 ~Anneal 650-700oC. Cool slowly in controlled furnace.$ {8 d* L4 T/ h! t. J: o5 ^, N. f
Carburize 880-930oC. Furnace or Air cool2 L- J: n: C2 e! u/ _% D
Core Refine 850-880oC. Oil quench or Air cool.
c) v6 B1 @/ ?4 YHarden 760-780oC Oil quench.
$ @0 Z, y$ X( D9 N8 ~, D7 x8 rTemper 180-200oC air cool7 m0 G+ ^4 G5 G4 p
& t; \) ^ ?0 N2 b# h9 ]
WELDING
' H) E8 e# R) L Parts should be welded before Carburizing and Hardening. Preheat to 250-350oC.
- O1 M" f; n4 g% o9 R2 e Filler metals:-Bohler FOX DCMS-KB or FOX 2.5 Ni electrodes. DCMS-IG wire.: {9 W2 x g W V
2 \3 \4 d l7 `$ `: R, J: ~# H
SIZE RANGE / r9 Z- u+ R# q; ^1 u& h
Round 42-142 mm |
|
[复制链接]
发表于 2008-3-22 22:55:26
楼主