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发表于 2008-3-23 08:19:55
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来自： LAN
英國標准
# G, W+ _9 w7 Z% \3 F7 ~EN39B Case hardening steel
' s( w7 B0 c8 C5 } C Si Mn Ni Cr Mo S P
: P" e% }" n: }4 s(Ave. values %) 0.15 0.25 0.4 4.2 1.2 0.25 0.025 0.0258 M8 s# u* a" l
AS DIN BS
4 j7 `3 i* K2 ~' e3 z5 rNEAREST
5 W: j G/ p" y- q6 X! u4 hSTANDARD X9315 1.6723 835 M 15) W5 ~! M, T j; Z
% E5 z! E) y2 W( c8 H- {, I# M* CDESCRIPTION " j; ~, U- h' ~
4¼% Nickel Chromium Molybdenum case hardening steel for large and highly% T: a2 J1 P, f& w
stressed applications.
) n+ w. n6 p6 T" u! _: H; |( K' [* T, E' |8 N' f" o7 X. Z. X
APPLICATIONS% J% ~% f8 F& A6 M" |
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.9 X3 F) j# t4 P. c
' @9 V) \, {0 j5 pMECHANICAL PROPERTIES Heat Treated Condition# W" T' e; z' M J0 [& y
Tensile Strength MPa 1310
) s& g& q: b* tElong.% 12
r3 M5 E4 I" r5 H0 SIzod Impact J 33
& F6 k( x) {! C7 a: y- \, t! B7 ^Brinell Hardness Annealed 277max
: o# T2 R; p" }4 s+ ~ n; m. F, i, C# R- l6 d: T- Y
HEAT TREATMENT
7 B5 C6 H: Y8 T9 S9 NForge 850-1050oC. Cool in furnace. G8 q. @* K- D* s- W7 m5 j% ], {
Normalize 850-880oC. Air cool.
! F8 z; e9 L% v9 c3 AAnneal 650-700oC. Cool slowly in controlled furnace.- i5 |6 ]5 Q1 Y0 o6 s3 a+ k
Carburize 880-930oC. Furnace or Air cool o' ~# t0 [6 {7 Z; J
Core Refine 850-880oC. Oil quench or Air cool.
3 a( K. m8 L) k4 K7 v: J! [7 AHarden 760-780oC Oil quench.
$ r7 K3 T# c3 ]5 B- L6 S1 F$ kTemper 180-200oC air cool
3 m5 A# Q$ b# ]8 o" V( t) Y; o
7 _1 u, O+ c9 U. M b7 SWELDING ; o1 n1 p7 F" q( ~+ o1 Y: N
Parts should be welded before Carburizing and Hardening. Preheat to 250-350oC.& W7 }& y: B$ W# _
Filler metals:-Bohler FOX DCMS-KB or FOX 2.5 Ni electrodes. DCMS-IG wire.9 ]* f& G( \7 ]( ^0 N
: j1 B. f" E' a- w. `SIZE RANGE
3 V. i8 Z+ k4 `9 l) ?Round 42-142 mm |
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发表于 2008-3-22 22:55:26
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