{"id":2943,"date":"2026-09-15T11:31:48","date_gmt":"2026-09-15T08:31:48","guid":{"rendered":"https:\/\/www.defencemetal.com\/index.php\/aisi-4340\/"},"modified":"2026-09-25T19:57:19","modified_gmt":"2026-09-25T16:57:19","slug":"aisi-4340","status":"publish","type":"page","link":"https:\/\/www.defencemetal.com\/index.php\/aisi-4340\/","title":{"rendered":"AISI 4340"},"content":{"rendered":"

<\/p>\n

AISI 4340 \/ UNS G43406 \/ AMS 6414 \/ AMS 6415<\/h1>\n
DEFENCE METAL<\/span><\/p>\n
\n
AISI 4340<\/div>\n
UNS G43400 (u\u00e7ak kalitesi E4340 = G43406) \u00b7 ASTM A29 \/ SAE J404 band\u0131: C %0,38-0,43 \u2013 Mn %0,60-0,80 \u2013 Si %0,15-0,35 \u2013 Cr %0,70-0,90 \u2013 Ni %1,65-2,00 \u2013 Mo %0,20-0,30 \u2013 P en \u00e7ok %0,035 \u2013 S en \u00e7ok %0,040 \u2013 kalan Fe. U\u00c7AK KAL\u0130TES\u0130 E4340’ta fosfor ve k\u00fck\u00fcrt tavan\u0131 %0,025’e \u00e7ekilir (Aircraft Materials ve Smiths Advanced). BEL\u0130RLEY\u0130C\u0130 ELEMENT N\u0130KELD\u0130R: %1,65-2,00 nikel 4140’ta yoktur ve bu kalitenin derin sertle\u015fmesinin sebebi budur. W.Nr. \/ EN ATAMASI KAYNAKLAR ARASINDA \u00c7EL\u0130\u015eK\u0130L\u0130D\u0130R ve bu y\u00fczden karta TEK B\u0130R NUMARA YAZILMAMI\u015eTIR: Virgamet sayfas\u0131 ba\u015fl\u0131kta 40NiCrMo8-4 ve 1.6565 verir ama ayn\u0131 sayfan\u0131n g\u00f6vdesinde 1.6565’i 40NiCrMo6 ile, 40NiCrMo8-4’u 1.6562 ile e\u015fler ve AISI 4340’a en yak\u0131n e\u015fde\u011fer olarak 40NiCrMo7 (UNI) \/ 40NCD7 (AFNOR) g\u00f6sterir; Otai 1.6511 \/ 36CrNiMo4 ve 34CrNiMo6 \/ 1.6582 verir; Flame Hardening 1.6565 ile birlikte ‘~EN24’ der. Bunlar\u0131n kimyasal bantlar\u0131 birbirinden farkl\u0131d\u0131r. S\u0130PAR\u0130\u015e, W.Nr. \u00dcZER\u0130NDEN DE\u011e\u0130L, UNS G43400 \/ ASTM A29 kimyas\u0131 ve AMS numaras\u0131 \u00fczerinden verilmelidir. MARTENZ\u0130T\u0130K ISLAH \u00c7EL\u0130\u011e\u0130D\u0130R: \u00f6stenitleme + ya\u011fa su verme + temperleme ile sertle\u015fir. PASLANMAZ DE\u011e\u0130LD\u0130R. \u00c7\u00d6KELME SERTLE\u015eMEZ; H900 \/ H1025 benzeri bir ya\u015fland\u0131rma kademesi YOKTUR.<\/div>\n
\n
Kar\u0131\u015ft\u0131r\u0131lmamas\u0131 gerekenler<\/div>\n

Ti Grade 5<\/a>300M<\/a>AISI 4140<\/a>AISI 8740<\/a><\/div>\n<\/div>\n

\n
\n
Ne i\u00e7in<\/div>\n
Kesit kal\u0131n oldu\u011fu halde merkeze kadar sertlik ve tokluk istenen par\u00e7alar i\u00e7in al\u0131n\u0131r: u\u00e7ak ini\u015f tak\u0131m\u0131 bile\u015fenleri, tahrik ve \u015fanz\u0131man milleri, a\u011f\u0131r kesitli krank ve di\u015fli, y\u00fcksek mukavemetli ba\u011flant\u0131 eleman\u0131, ASTM A320 Grade L43 d\u00fc\u015f\u00fck s\u0131cakl\u0131k c\u0131vatas\u0131.<\/div>\n<\/div>\n
\n
Formlar<\/div>\n
Yuvarlak \u00e7ubuk \u00b7 lama \u00b7 levha \u00b7 sac \u00b7 boru \u00b7 d\u00f6vme. T\u00fcm formlar sipari\u015f baz\u0131nda temin edilmektedir; 4340 VAR \u00fcr\u00fcn sayfas\u0131nda ‘istenen \u00f6l\u00e7\u00fc ve formda, sertifikal\u0131 olarak temin edilir’ denmektedir.<\/div>\n<\/div>\n
\n
Standartlar<\/div>\n
AMS (do\u011frulanm\u0131\u015f, d\u00fcz 4340 kimyas\u0131 0,80Cr \u2013 1,8Ni \u2013 0,25Mo \u2013 C %0,38-0,43): 6415 (\u00c7UBUK, D\u00d6VME, MEKAN\u0130K TUBE, D\u00d6VME K\u00dcT\u00dc\u011e\u00dc; hava ergitme; temel numara) \u00b7 6414 (ayn\u0131 formlar; VAKUM ARK YEN\u0130DEN ERG\u0130TME \/ VAR \u015fartl\u0131) \u00b7 6409 (ayn\u0131 formlar; \u00d6ZEL U\u00c7AK KAL\u0130TES\u0130 TEM\u0130ZL\u0130K; NORMAL\u0130ZE VE TEMPERLENM\u0130\u015e) \u00b7 6484 (ayn\u0131 formlar; NORMAL\u0130ZE VE TEMPERLENM\u0130\u015e) \u00b7 6359 (SAC, \u015eER\u0130T, LEVHA; u\u00e7ak kalitesi) \u00b7 6454 (SAC, \u015eER\u0130T, LEVHA; VAR \u015fartl\u0131) \u00b7 6456 (KAYNAK TEL\u0130 \u2014 dikkat: bu numaran\u0131n karbonu %0,35-0,40’tir ve ba\u015fl\u0131\u011f\u0131 SAE 4340Mod’dur; d\u00fcz 4340 de\u011fildir). Eski askeri \u015fartname: AMS-S-5000 \/ MIL-S-5000. ASTM: A29 \/ A29M (genel \u015fartlar) \u00b7 A304 (sertle\u015febilirlik \u015fartl\u0131 ala\u015f\u0131ml\u0131 \u00e7ubuk) \u00b7 A322 (standart kalite ala\u015f\u0131ml\u0131 \u00e7ubuk) \u00b7 A331 (so\u011fuk \u00e7ekilmi\u015f \u00e7ubuk) \u00b7 A506 (s\u0131cak haddelenmi\u015f sac ve \u015ferit) \u00b7 A519 (diki\u015fsiz mekanik tube) \u00b7 A646 (premium kalite havac\u0131l\u0131k bloom ve k\u00fct\u00fck; 4340-7 s\u0131n\u0131f\u0131) \u00b7 A711 (d\u00f6vme k\u00fct\u00fc\u011f\u00fc) \u00b7 A752 (tel \u00e7ubuk) \u00b7 A829 (ala\u015f\u0131ml\u0131 yap\u0131 levhas\u0131) \u00b7 A320 Grade L43 (d\u00fc\u015f\u00fck s\u0131cakl\u0131k c\u0131vata). EN \/ ISO: W.Nr. atamas\u0131 \u00e7eli\u015fkilidir; kimlik alan\u0131na bak\u0131n\u0131z.
AMS NUMARALARI B\u0130RB\u0130R\u0130N\u0130N YER\u0130NE GE\u00c7MEZ. Alt\u0131 numara ayn\u0131 kimyasal band\u0131 ta\u015f\u0131r ama ERG\u0130TME YOLU, TEM\u0130ZL\u0130K SEV\u0130YES\u0130 ve TESL\u0130M DURUMU farkl\u0131d\u0131r: 6415 hava ergitme temel numaras\u0131d\u0131r; 6414 VAKUM ARK YEN\u0130DEN ERG\u0130TME (VAR) \u015fart\u0131 getirir;<\/span><\/div>\n<\/div>\n
\n
Art\u0131s\u0131<\/div>\n
Tek en \u00f6nemli pratik \u00fcst\u00fcnl\u00fc\u011f\u00fc, ayn\u0131 \u00e7ekme band\u0131n\u0131 \u00e7ok daha kal\u0131n kesitte tutabilmesidir ve bunun say\u0131sal kar\u015f\u0131l\u0131\u011f\u0131 ayn\u0131 standardin (AS 1444-1996) ayn\u0131 ko\u015ful harfi tablosunda okunur: 250 mm kesitte 4340 i\u00e7in T ko\u015fulu 850-1000 MPa \u00e7ekme ve en az 570 MPa akma ile verilirken, ayn\u0131 kesitte 4140 i\u00e7in\u2026<\/div>\n<\/div>\n
\n
Kaynak<\/div>\n
KAYNAK ED\u0130LEB\u0130L\u0130R AMA 4140’TAN DAHA ZORDUR, \u00e7\u00fcnk\u00fc sertle\u015febilirli\u011fi daha y\u00fcksektir: \u0131s\u0131 tesir b\u00f6lgesi daha geni\u015f bir so\u011fuma h\u0131z\u0131 aral\u0131\u011f\u0131nda martenzite d\u00f6ner.<\/div>\n<\/div>\n
\n
S\u0131n\u0131rlar\u0131<\/div>\n
1) PASLANMAZ DE\u011e\u0130LD\u0130R. Kromu %0,70-0,90’dir ve pasif tabaka olu\u015fturmaz; korozyon korumas\u0131 zorunludur. Nikel oran\u0131 y\u00fcksek diye paslanmaz san\u0131lmas\u0131 bu kalitede s\u0131k yap\u0131lan bir hatad\u0131r.
\n2) Y\u00dcKSEK MUKAVEMET = Y\u00dcKSEK H\u0130DROJEN R\u0130SK\u0130. 4340’\u0131n kullan\u0131ld\u0131\u011f\u0131 mukavemet seviyeleri (1400 MPa ve \u00fcst\u00fc) hidrojen gevrekli\u011fine en duyarl\u0131 b\u00f6lgedir.<\/div>\n<\/div>\n
TEKL\u0130F \u0130STE<\/a>T\u00fcm ala\u015f\u0131ml\u0131 \u00e7elikler →<\/a>TEKN\u0130K DETAYLAR ↓<\/span><\/div>\n
Veriler \u00fcretici veri sayfalar\u0131ndan derlenmi\u015ftir · sipari\u015f \u00f6ncesi g\u00fcncel \u015fartnameden teyit ediniz<\/div>\n<\/div>\n<\/div>\n

<\/p>\n