Aisi 4340 Karfe | 36CrNiMo4 | 1,6511 | EN24 | 817M40 | SNCM439

Aisi 4340 karfe

ne a matsakaici carbon, low gami karfe sani na da tauri da kuma
ƙarfi a gwada manyan sassan. Aisi 4340 ne kuma daya irin
nickel chromium molybdenum steels. 4340 gami karfe ne kullum
kawota ƙẽƙashe kuma zafin a cikin tensile kewayon 930 - 1080 Mpa.
Pre ƙẽƙashe kuma zafin 4340 steels iya zama m surface taurare, ta

harshen wuta ko shigar da hardening da kuma ta nitriding. A 4340 karfe yana da kyau
buga da kuma tasiri juriya, kazalika da lalacewa da abrasion juriya a
cikin taurare yanayin. Aisi 4340 karfe Properties bayar da kyau ductility
a annealed yanayin, kyale shi za a lankwashe à ko kafa. Fusion da kuma
juriya waldi ne kuma zai yiwu tare da mu 4340 gami karfe. ASTM 4340

material ne sau da yawa amfani inda wasu gami steels ba su da
hardenability ba ƙarfin da ake bukata. Domin sosai jaddada sassa
shi ne kyau zabi. Aisi 4340 gami karfe kuma za a iya machined da
duk m hanyoyin.

Saboda kasancewa da ASTM 4340 aji karfe ne sau da yawa musanya
da Turai dangane da matsayin 817M40 / EN24 da 1,6511 / 36CrNiMo4 ko Japan
tushen SNCM439 karfe. Kana da cikakken data na 4340 karfe kasa.

1. Aisi 4340 Karfe Musammantawa da Relevant Standards

2. ASTM 4340 Steels Kuma Equilvalents Chemical Abun da ke ciki

3. Aisi Alloy 4140 Karfe inji Properties

thermal Properties

4. Forging na 4340 Alloy Karfe

Preheat

da karfe 4340 na farko, zafi sama zuwa 1150 ° C - 1200 ° C iyakar for ƙirƙirãwa,
rike har zafin jiki ne uniform a ko'ina cikin sashe.

Kada ku ƙirƙira

kasa 850 ° C. 4340 yana da kyau Forging halaye amma kula dole ne a
dauka a lokacin da sanyaya matsayin karfe nuna laulayi fatattaka.
Wadannan Forging aiki da aikin yanki ya kamata a sanyaya kamar yadda sannu a hankali kamar yadda

zai yiwu. Kuma sanyaya a cikin yashi ko bushe lemun tsami bada shawarar da dai sauransu

5. Aisi 4340 Karfe Grade Heat jiyya

• danniya ya ɗauke

Domin

pre-taurare karfe danniya ya ɗauke aka samu da dumama karfe 4340
zuwa tsakanin 500 zuwa 550 ° C. Heat zuwa 600 ° C - 650 ° C, rike har zafin jiki

ne uniform a ko'ina cikin sashe, jiƙa for 1 hour da 25 mm sashe,
da kuma kwantar a yanzu iska.

• Annealing

A

cikakken anneal iya yi a 844 ° C (1550 F) bi sarrafawa
(makera) sanyaya a wani kudi ba da sauri fiye da 10 ° C (50 F) awa saukar zuwa

315 ° C (600 F). Daga 315 ° C 600 F shi yana iya zama iska sanyaya.

• Tempering

Aisi

4340 gami karfe kasance a cikin zãfi bi da ko bisa al'ada da zafi
bi da yanayin kafin tempering. A tempering zazzabi for
dogara kan karfin matakin da ake so. Domin karfin matakan a cikin 260 -

280 ksi kewayon fushi a 232 ° C (450 F). Domin ƙarfi a cikin 125 - 200
ksi kewayon fushi a 510 ° C (950 F). Kuma kada zafin da 4340 steels idan
shi ne a cikin 220 - 260 ksi ƙarfi fuska kamar yadda tempering iya haifar da
lalacewar tasiri juriya domin wannan matakin na da ƙarfi.

Tempering kamata a kauce masa idan zai yiwu a cikin kewayon 250 ° C - 450 ° C saboda zafin brittleness.

• Flame ko shigar da hardening

Kamar yadda aka ambata a sama, pre-ƙẽƙashe kuma zafin 4340 karfe sanduna ko faranti na iya zama m surface taurare, ta ko dai harshen wuta ko shigar da hardening

hanyoyin sakamakon wani hali taurin a wuce haddi na RC 50. Aisi 4340
karfe sassa kamata a mai tsanani da sauri zuwa ga da austenitic
zazzabi range (830 ° C - 860 ° C) da ake bukata hali zurfin bi ta
wani nan da nan mai ko ruwa quenching, dangane bisa taurin ake bukata,
workpiece size / siffar da quenching shirye-shirye.

Wadannan
quenching to mika dumi, tempering a 150 ° C - 200 ° C zai rage gajiyan
a cikin yanayin da kadan sakamako a kan ta daga bãyan wancan.

All de-carburised surface abu na farko dole ne a cire don tabbatar da mafi kyau da sakamakon.

• Nitriding

Ƙẽƙashe

kuma zafin 4340 gami karfe kuma za a iya nitrided, bada wani surface
taurin har zuwa RC 60. Heat zuwa 500 ° C - 530 ° C da kuma rike for isasshen
lokaci (daga 10 zuwa 60 hours) wajen samar da zurfin hali. Nitriding

ya kamata a bi da jinkirin sanyaya (babu ice), Munã rage matsalar da
murdiya. A nitrided sa 4340 kayan iya sabili da haka za machined
zuwa kusa da karshe size, barin wani karamin nika allowance kawai. A tensile

ƙarfin da 4340 karfe abu core ne yawanci ba ya canzawa tun
da nitriding zafin jiki fuska ne kullum a kasa asali
tempering zafin jiki aiki.

Surface taurin achievable ne 600 zuwa 650HV.

6. Machinability

Machining

ne mafi kyau yi tare da gami karfe 4340 a annealed ko bisa al'ada
da kuma zafin yanayin. Yana za ta iya daukar machined da duk al'ada
hanyoyin kamar sawing, juya, hakowa da dai sauransu Duk da haka, a cikin babban
karfin yanayin 200 ksi ko mafi girma da machinability ne kawai daga

25% zuwa 10% cewa daga cikin gami a cikin annealed yanayin.

7. Welding

Welding

na karfe 4340 a ƙẽƙashe kuma zafin yanayin (as kullum
kawota), ba da shawarar da ya kamata a kauce masa idan a duk zai yiwu,
saboda hatsarin ice fatattaka, a matsayin inji Properties
za a canza a cikin Weld zafi shafa zone.

Idan waldi

dole ne a za'ayi, pre-zafi zuwa 200 zuwa 300 ° C da kuma kula da wannan yayin da
waldi. Nan da nan bayan waldi danniya taimaka a 550 zuwa 650 ° C, kafin

su hardening da kuma tempering.

Idan waldi a ƙẽƙashe kuma
zafin yanayin ne da gaske zama dole, sa'an nan aikin yanki, nan da nan

a kan sanyaya a mika dumi, ya kamata idan zai yiwu danniya kuranye a 15 ° C

da ke ƙasa asali tempering zazzabi.

8. Application na 4340 Karfe

Aisi

4340 karfe da aka yi amfani da mafi masana'antu sassa na aikace-aikace bukata
mafi girma tensile / amfanin ƙasa ƙarfi daga 4140 karfe iya samar.

Wasu hankula aikace-aikace kamar:

• Aircraft Saukowa Gear

• Automotive,

• Oil and Gas hakowa,

• bisa ƙirƙira,

• Dumi da kuma Cold kafa,

• Machine Building,

• Sauye Systems, kamar ikon watsa giya da shafts.

• Janar
  
  injiniya masana'antu da kuma tsarin yin amfani da aikace-aikace, kamar: nauyi
  wajibi shafts, giya, axles, spindles, couplings, fil, chucks, kyawon tsayuwa da dai sauransu