Kenyelletso ea sehlahisoa
AISI 4340tshepeke k'habone e mahareng, tšepe ea alloy e tlase e tsejoang ka ho tiea le matla a eona likarolong tse batlang li le kholo. AISI 4340 hape ke mofuta o le mong oa litšepe tsa nickel chromium molybdenum. 4340 alloy steel hangata e fanoa e le thata ebile e halefile ka har'a mefuta e fapaneng ea 930 - 1080 Mpa. Litšepe tse 4340 tse thatafalitsoeng le tse halefileng li ka thatafatsoa ka ho fetesisa ke lelakabe kapa ho thatafala ha induction le ka nitriding. Tšepe ea 4340 e na le ts'okelo e ntle 'me e hanyetsana le tšusumetso hammoho le ho se mamelle le ho hahloa ha boemo bo thata. Lisebelisoa tsa tšepe tsa AISI 4340 li fana ka ductility e ntle boemong ba annealed, e lumellang hore e kobehe kapa e thehoe. Fusion le ho hanyetsa welding le tsona lia khoneha ka tšepe ea rona ea 4340 alloy. Lisebelisoa tsa ASTM 4340 hangata li sebelisoa moo litšepe tse ling tsa alloy li se nang boima ba ho fana ka matla a hlokahalang. Bakeng sa likarolo tse hatelitsoeng haholo ke khetho e ntle haholo. AISI 4340 alloy steel le eona e ka etsoa ka mekhoa eohle e tloaelehileng.
Ka lebaka la ho fumaneha ha tšepe ea ASTM 4340 hangata e nkeloa sebaka ke maemo a Europe a 817M40/EN24 le 1.6511/36CrNiMo4 kapa tšepe ea SNCM439 ea Japane. U na le lintlha tse qaqileng tsa tšepe ea 4340 ka tlase.
1. AISI Alloy 4340 Steel Supply Range
4340 Steel Round Bar: bophara ba 8mm - 3000mm (*Dia30-240mm ka setokong maemong a annealed, thomello ea hanghang)
Plate ea tšepe ea 4340: botenya 10mm - 1500mm x bophara 200mm - 3000mm
4340 Steel Grade Square: 20mm - 500mm
Surface Finish: E Ntšo, e Khōlō e Entsoe, E Fetotsoe kapa ho ea ka litlhoko tse fanoeng.
2. Tlhaloso ea Tšepe ea AISI 4340 le Maemo a Tšoanelehang
| Naha |
usa |
Brithani |
Brithani |
Japane |
| Standard |
ASTM A29 |
EN 10250 |
BS970 |
JIS G4103 |
| Mephato |
4340 |
36CrNiMo4/
1.6511 |
EN24/817M40 |
SNCM 439/SNCM8 |
3. ASTM 4340 Steels And Equilvalents Chemical Composition
| Standard |
Kereiti |
C |
Mong |
P |
S |
Si |
Ni |
Kr |
Mo |
| ASTM A29 |
4340 |
0.38-0.43 |
0.60-0.80 |
0.035 |
0.040 |
0.15-0.35 |
1.65-2.00 |
0.70-0.90 |
0.20-0.30 |
| EN 10250 |
36CrNiMo4/
1.6511 |
0.32-0.40 |
0.50-0.80 |
0.035 |
0.035 |
≦0.40 |
0.90-1.20 |
0.90-1.2 |
0.15-0.30 |
| BS970 |
EN24/817M40 |
0.36-0.44 |
0.45-0.70 |
0.035 |
0.040 |
0.1-0.40 |
1.3-1.7 |
1.00-1.40 |
0.20-0.35 |
| JIS G4103 |
SNCM 439/SNCM8 |
0.36-0.43 |
0.60-0.90 |
0.030 |
0.030 |
0.15-0.35 |
1.60-2.00 |
0.60-1.00 |
0.15-0.30 |
4. AISI Alloy 4340 Steel Mechanical Properties
| Thepa ea Mechini
(Boemo ba Pheko ea Mocheso)
|
Boemo |
Karolo e laolang
mm |
Tensile Matla MPa |
Kotulo Matla
MPa |
Elong.
% |
Izod Impact
J |
Brinell
Ho thatafala |
| T |
250 |
850-1000 |
635 |
13 |
40 |
248-302 |
| T |
150 |
850-1000 |
665 |
13 |
54 |
248-302 |
| U |
100 |
930-1080 |
740 |
12 |
47 |
269-331 |
|
| V |
63 |
1000-1150 |
835 |
12 |
47 |
293-352 |
| W |
30 |
1080-1230 |
925 |
11 |
41 |
311-375 |
| X |
30 |
1150-1300 |
1005 |
10 |
34 |
341-401 |
|
| Y |
30 |
1230-1380 |
1080 |
10 |
24 |
363-429 |
| Z |
30 |
1555- |
1125 |
5 |
10 |
444- |
Thermal Properties
| Thepa |
Metric |
Moemphera |
| Tšebelisano-'moho ea katoloso ea mocheso (20°C/68°F, oli ea mohlala e thatafalitsoe, mocheso oa 600°C (1110°F) |
12.3 µm/m°C |
6.83 µin/in°F |
| Thermal conductivity (tšepe e tloaelehileng) |
44.5 W/mK |
309 BTU ho/hr.ft².°F |
5. Ho etsoa ha 4340 Alloy Steel
Preheat tšepe 4340 pele, mocheso ho fihlela ho 1150 ° C - 1200 ° C boholo ba ho forging, tšoara ho fihlela mocheso o lekana ho pholletsa le karolo.
Se ke oa fetelletsa ka tlase ho 850 °C. 4340 e na le litšobotsi tse ntle tsa ho qhekella empa tlhokomelo e tlameha ho nkuoa ha e pholile kaha tšepe e bonts'a ho pepeseha habonolo. Ka mor'a ts'ebetso ea ho qhekella, karolo ea mosebetsi e lokela ho pholile butle ka hohle kamoo ho ka khonehang. 'Me ho pholile ka lehlabatheng kapa kalaka e omeletseng ho khothalletsoa joalo-joalo.
6. AISI 4340 Steel Grade Heat Treatment
Bakeng sa ho imolla khatello ea tšepe pele ho thata ho fihleloa ka ho futhumatsa tšepe ea 4340 ho ea lipakeng tsa 500 ho isa ho 550 ° C. Mocheso ho isa ho 600 °C - 650 °C, tšoara ho fihlela mocheso o lekana ho pholletsa le karolo, inela hora e le 1 karolong ea 25 mm, 'me u phole moeeng o khutsitseng.
Anneal e feletseng e ka etsoa ka 844 ° C (1550 F) e lateloa ke ho pholile ho laoloang (sebōpi) ka lebelo le sa feteng 10 ° C (50 F) ka hora ho ea ho 315 ° C (600 F). Ho tloha ho 315°C 600 F e ka ba moea o pholileng.
AISI 4340 alloy steel e lokela ho ba ka mochesong o phekotsoeng kapa ho tloaeleha le ho phekoloa mocheso pele o halefa. Thempereichara ea mocheso e itšetlehile ka matla a lakatsehang. Bakeng sa maemo a matla ho 260 - 280 ksi range temper ho 232 ° C (450 F). Bakeng sa matla ho 125 - 200 ksi range temper ho 510 ° C (950 F). Hape u se ke ua halefisa litšepe tsa 4340 haeba li le ka har'a matla a 220 - 260 ksi kaha ho halefa ho ka fella ka ho senyeha ha matla a ho hanyetsa boemong bona ba matla.
Ho futhumatsa ho lokela ho qojoa ha ho khoneha ka har'a mocheso oa 250 °C - 450 °C ka lebaka la ho halefa.
- Lelakabe kapa Induction Harding
Joalokaha ho boletsoe ka holimo, litšepe kapa lipoleiti tsa 4340 tse thatafalitsoeng pele li ka thatafatsoa ka holim'a lelakabe kapa mekhoa ea ho thatafatsa ea induction e bakang boima ba kesi ho feta Rc 50. Likarolo tsa tšepe tsa AISI 4340 li lokela ho futhumatsoa kapele kamoo ho ka khonehang. mocheso o fapaneng oa austenitic (830 ° C - 860 ° C) le botebo bo hlokahalang bo lateloa ke ho tima oli hang-hang kapa ho tima metsi, ho itšetlehile ka boima bo hlokahalang, boholo ba mosebetsi / sebopeho le litokisetso tsa ho tima.
Ka mor'a ho tima letsoho ho futhumala, ho halefa ka 150 ° C - 200 ° C ho tla fokotsa khatello ea kelello tabeng e nang le phello e fokolang holim'a ho thatafala ha eona.
Lintho tsohle tse tsoang holim'a metsi li tlameha ho tlosoa pele ho netefatsa liphello tse ntle.
Tšepe ea alloy e thata le e halefileng ea 4340 le eona e ka ba nitrided, e fana ka boima ba holim'a metsi ho fihlela ho Rc 60. Mocheso ho 500 ° C - 530 ° C 'me u tšoare nako e lekaneng (ho tloha ho lihora tse 10 ho isa ho tse 60) ho hlahisa botebo ba nyeoe. Nitriding e lokela ho lateloa ke ho pholisa butle (ha ho tima) ho fokotsa bothata ba ho khopama. Thepa ea nitrided grade 4340 ka hona e ka etsoa mochini ho isa boholo ba ho qetela, e siea chelete e nyane feela ea ho sila. Matla a tsitsitseng a motheo oa tšepe ea 4340 hangata ha a amehe kaha mocheso oa nitriding hangata o ka tlase ho mocheso oa pele oa mocheso o sebelisitsoeng.
Ho thatafala ha bokaholimo ho ka fihlellehang ke 600 ho isa ho 650HV.
7. Ho sebetsa
Ho sebetsa ka mokhoa o motle ka ho fetisisa ka tšepe ea alloy 4340 ka mokhoa o tsitsitseng kapa o tloaelehileng le o halefileng. E ka etsoa habonolo ka mekhoa eohle e tloaelehileng e kang ho sakha, ho reteleha, ho cheka joalo-joalo Leha ho le joalo maemong a matla a phahameng a 200 ksi kapa ho feta machinability ke feela ho tloha ho 25% ho ea ho 10% ea alloy boemong ba annealed.
8. Welding
Welding ea tšepe 4340 boemong bo thata le bo halefileng (joalo ka ha ho fanoa ka tloaelo), ha e khothalletsoe 'me e lokela ho qojoa ha ho khoneha, ka lebaka la kotsi ea ho tima ho phatloha, kaha thepa ea mochine e tla fetoloa ka har'a sebaka se amehileng ke mocheso oa weld.
Haeba welding e tlameha ho kengoa, futhumatsa pele ho 200 ho isa ho 300°C 'me u boloke sena ha u cheselletsa. Hang ka mor'a ho cheselletsa khatello ea kelello imolla ho 550 ho 650 ° C, pele ho thatafala le ho halefa.
Haeba tjheseletsa maemong a thata le a halefileng a hlile a hlokahala, joale karolo ea ho sebetsa, hang-hang ha ho pholile ho futhumatsa letsoho, e lokela ho fokotsoa khatello ea maikutlo ho 15 °C ka tlase ho mocheso oa pele oa mocheso.
9. Tšebeliso ea 4340 Steel
AISI 4340 tšepe e sebelisoa likarolong tse ngata tsa indasteri bakeng sa lits'ebetso tse hlokang matla a phahameng a tensile / lihlahisoa ho feta tšepe ea 4140 e ka fanang ka eona.
Lisebelisoa tse ling tse tloaelehileng joalo ka:
- Lisebelisoa tsa ho Lulisa Lifofane
- Likoloi,
- Ho Cheka Oli le Khase,
- Ho qhekella,
- Mofuthu le ho bata,
- Kaho ea Mechini,
- Transfer Systems, joalo ka likere tsa phetisetso ea matla le shafts.
- Liindasteri tse akaretsang tsa boenjiniere le lits'ebetso tsa ts'ebeliso ea meralo, joalo ka: li-shafts tse boima, likere, li-axle, li-spindle, li-couplings, li-pin, li-chucks, hlobo, joalo-joalo.
Gnee Steel ke e mong oa barekisi ba ka sehloohong ba tšepe ea AISI 4340 bakeng sa ts'ebeliso ea hau e fapaneng joalo ka holimo. 'Me re fana ka tšepe ea 4140, litšepe tse 4130 hape. Ikopanye le 'na' me u ntsebise likopo tsa hau neng kapa neng.
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