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发表于 2008-3-23 08:19:55
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来自: LAN
英國標准6 m2 q8 A3 L5 H
EN39B Case hardening steel
4 T4 P, v% Q) ^6 E. k- w5 B C Si Mn Ni Cr Mo S P
/ J2 d) ~6 e+ L6 e$ L2 _2 _6 I(Ave. values %) 0.15 0.25 0.4 4.2 1.2 0.25 0.025 0.025) U$ _0 U0 c! [) j
AS DIN BS9 U0 k1 f4 H! A
NEAREST
. H/ }3 m0 y4 L) e4 {$ h1 TSTANDARD X9315 1.6723 835 M 152 H' I) I5 y3 |" A: x
; s r/ L, \- t' y3 V! t$ uDESCRIPTION
# u6 G, B# A) D 4¼% Nickel Chromium Molybdenum case hardening steel for large and highly8 S# y( e1 q$ b) M( D% i. N7 e* ]2 R
stressed applications.
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APPLICATIONS
( _1 i$ ~1 u4 H1 H! S- Z, w 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.
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MECHANICAL PROPERTIES Heat Treated Condition
- c0 U( Y( N0 t3 p$ V2 T/ x zTensile Strength MPa 1310
4 @ T0 @1 t1 B2 `+ |7 GElong.% 12
' c/ A- X/ B! b: e9 P B3 C+ gIzod Impact J 33
% l& w w/ C7 N' A8 k5 E; uBrinell Hardness Annealed 277max
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$ }/ M2 {5 S+ KHEAT TREATMENT5 @" E2 A+ ?+ A0 }/ }, J7 `
Forge 850-1050oC. Cool in furnace./ P1 B7 _& x: |' U+ D' @. G
Normalize 850-880oC. Air cool.* S% s, }% r$ \4 |7 r/ x
Anneal 650-700oC. Cool slowly in controlled furnace.1 c$ Y, v5 |0 C; r: [
Carburize 880-930oC. Furnace or Air cool
, \, d6 k6 Z1 C- b C& K/ I" V# }Core Refine 850-880oC. Oil quench or Air cool.+ E9 h$ u& V0 C" D# f* b
Harden 760-780oC Oil quench.; c" W/ ~' W6 V2 p& x d
Temper 180-200oC air cool
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0 w3 \6 y$ ~+ h3 T: W4 hWELDING , Z- ~5 y& C t2 @8 r
Parts should be welded before Carburizing and Hardening. Preheat to 250-350oC.. H0 q+ g1 S. f, E4 G9 m9 D
Filler metals:-Bohler FOX DCMS-KB or FOX 2.5 Ni electrodes. DCMS-IG wire.6 F& E X$ |# |. s. Q' h
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SIZE RANGE / o9 ` o) ?" o1 ]; \
Round 42-142 mm |
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