{"id":6216,"date":"2026-09-25T19:52:52","date_gmt":"2026-09-25T16:52:52","guid":{"rendered":"https:\/\/www.defencemetal.com\/index.php\/2026\/09\/25\/aisi-f255-aisi-f55-farki\/"},"modified":"2026-09-30T10:44:31","modified_gmt":"2026-09-30T07:44:31","slug":"aisi-f255-aisi-f55-farki","status":"publish","type":"post","link":"https:\/\/www.defencemetal.com\/index.php\/2026\/09\/25\/aisi-f255-aisi-f55-farki\/","title":{"rendered":"AISI F255 ile AISI F55 Aras\u0131ndaki Fark Nedir?"},"content":{"rendered":"

AISI F255<\/strong> ve AISI F55<\/strong> ikisi de s\u00fcper dubleks paslanmaz \u00e7eliktir. Krom, nikel ve molibden seviyeleri birbirine yak\u0131nd\u0131r. Ayr\u0131\u015ft\u0131klar\u0131 yer iki elementtir: F255’in bak\u0131r\u0131, F55’in tungsteni.<\/strong><\/p>\n

Bak\u0131r m\u0131, tungsten mi?<\/h3>\n

F255 (1.4507) nominal olarak yakla\u015f\u0131k %2 bak\u0131r<\/strong> i\u00e7erir ve tungsten i\u00e7ermez. Bak\u0131r, \u00f6zellikle s\u00fclf\u00fcrik ve fosforik asit<\/strong> ortamlar\u0131nda diren\u00e7 sa\u011flar — Langley Alloys, Rolled Alloys, Industeel ve IMOA bu noktada birle\u015fiyor.<\/p>\n

F55 (UNS S32760) ise bak\u0131r\u0131 %0,50 – 1,00 ile s\u0131n\u0131rlay\u0131p yerine %0,50 – 1,00 tungsten<\/strong> koyar. Tungstenin amac\u0131 \u00e7ukurcuk direncini art\u0131rmakt\u0131r — ama a\u015fa\u011f\u0131da g\u00f6rece\u011finiz gibi bu katk\u0131n\u0131n \u015fartname d\u00fczeyinde say\u0131l\u0131p say\u0131lmad\u0131\u011f\u0131 tart\u0131\u015fmal\u0131d\u0131r.<\/p>\n

Rakamlarla kar\u015f\u0131la\u015ft\u0131rma<\/h3>\n
\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
\u00d6ZELL\u0130K<\/th>\nAISI F255 (1.4507)<\/th>\nAISI F55 (S32760)<\/th>\n<\/tr>\n<\/thead>\n
ASTM A182 g\u00f6sterimi<\/td>\nF59<\/strong> (S32520) veya F61<\/strong> (S32550) — bkz. a\u015fa\u011f\u0131<\/td>\nF55<\/strong><\/td>\n<\/tr>\n
EN \/ W.Nr<\/td>\n1.4507<\/td>\n1.4501<\/td>\n<\/tr>\n
Karbon (C)<\/td>\nmax %0,030<\/td>\nmax %0,030<\/td>\n<\/tr>\n
Krom (Cr)<\/td>\n%24,00 – 26,00<\/td>\n%24,00 – 26,00<\/td>\n<\/tr>\n
Nikel (Ni)<\/td>\n%6,00 – 8,00<\/td>\n%6,00 – 8,00<\/td>\n<\/tr>\n
Molibden (Mo)<\/td>\n%3,00 – 4,00<\/td>\n%3,00 – 4,00<\/td>\n<\/tr>\n
Bak\u0131r (Cu)<\/strong><\/td>\nnominal ~%2 (ala\u015f\u0131m katk\u0131s\u0131)<\/strong><\/td>\n%0,50 – 1,00<\/strong><\/td>\n<\/tr>\n
Tungsten (W)<\/strong><\/td>\nyok<\/strong><\/td>\n%0,50 – 1,00<\/strong><\/td>\n<\/tr>\n
Azot (N)<\/td>\n%0,20 – 0,30<\/td>\n%0,20 – 0,30<\/td>\n<\/tr>\n
Mangan (Mn)<\/td>\nmax %2,00<\/td>\nmax %1,00<\/td>\n<\/tr>\n
Akma (Rp0,2), \u00e7\u00f6zeltiye al\u0131nm\u0131\u015f<\/td>\n\u2265 500 MPa (EN 10088-3)<\/td>\n\u2265 550 N\/mm²<\/td>\n<\/tr>\n
\u00c7ekme (Rm), \u00e7\u00f6zeltiye al\u0131nm\u0131\u015f<\/td>\n700 – 900 MPa (EN 10088-3)<\/td>\n\u2265 750 N\/mm²<\/td>\n<\/tr>\n
Kopma uzamas\u0131<\/td>\n\u2265 %25<\/td>\n\u2265 %25<\/td>\n<\/tr>\n
NACE MR0175 \/ ISO 15156<\/td>\nlisteli (max 28 HRC)<\/td>\nlisteli (max 28 HRC)<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

Bile\u015fim: \u00fc\u00e7 ayr\u0131 \u015fartname, \u00fc\u00e7 ayr\u0131 s\u0131n\u0131r<\/h3>\n

Bu kalitenin en b\u00fcy\u00fck tuza\u011f\u0131 burada. Ayn\u0131 ticari ad i\u00e7in \u00fc\u00e7 farkl\u0131 \u015fartname band\u0131<\/strong> dola\u015f\u0131mdad\u0131r ve bunlar birbirinin yerine ge\u00e7mez. A\u015fa\u011f\u0131daki tablo \u00fc\u00e7\u00fcn\u00fc yan yana koyuyor (a\u011f\u0131rl\u0131k\u00e7a %).<\/p>\n

\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
ELEMENT<\/th>\nEN 1.4507<\/th>\nUNS S32520 (ASTM A240)<\/th>\nUNS S32550 (ASTM)<\/th>\n<\/tr>\n<\/thead>\n
Karbon (C)<\/td>\nmax 0,030<\/td>\nmax 0,030<\/td>\nmax 0,040<\/td>\n<\/tr>\n
Silisyum (Si)<\/td>\nmax 0,70<\/td>\nmax 0,80<\/td>\nmax 1,00<\/td>\n<\/tr>\n
Mangan (Mn)<\/td>\nmax 2,00<\/td>\nmax 1,50<\/td>\nmax 1,50<\/td>\n<\/tr>\n
Fosfor (P)<\/td>\nmax 0,035<\/td>\nmax 0,035<\/td>\nmax 0,040<\/td>\n<\/tr>\n
K\u00fck\u00fcrt (S)<\/td>\nmax 0,015<\/td>\nmax 0,020<\/td>\nmax 0,030<\/td>\n<\/tr>\n
Krom (Cr)<\/td>\n24,0 – 26,0<\/td>\n24,0 – 26,0<\/td>\n24,0 – 27,0<\/td>\n<\/tr>\n
Nikel (Ni)<\/strong><\/td>\n6,0 – 8,0<\/strong><\/td>\n5,5 – 8,0<\/strong><\/td>\n4,5 – 6,5<\/strong><\/td>\n<\/tr>\n
Molibden (Mo)<\/td>\n3,0 – 4,0<\/td>\n3,0 – 4,0<\/td>\n2,9 – 3,9<\/td>\n<\/tr>\n
Azot (N)<\/td>\n0,20 – 0,30<\/td>\n0,20 – 0,35<\/td>\n0,10 – 0,25<\/td>\n<\/tr>\n
Bak\u0131r (Cu)<\/td>\n1,00 – 2,50<\/td>\n0,50 – 2,00<\/td>\n1,50 – 2,50<\/td>\n<\/tr>\n
Tungsten (W)<\/td>\ntan\u0131ml\u0131 de\u011fil<\/td>\ntan\u0131ml\u0131 de\u011fil<\/td>\ntan\u0131ml\u0131 de\u011fil<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n
\n

EN 1.4507 metalurjik olarak S32520’ye yak\u0131nd\u0131r, S32550’ye de\u011fil.<\/p>\n

Yukar\u0131daki nikel sat\u0131r\u0131na bak\u0131n: 1.4507 (%6,0–8,0) ile S32520 (%5,5–8,0) neredeyse \u00f6rt\u00fc\u015f\u00fcyor; S32550 (%4,5–6,5) ise ayr\u0131 bir bantt\u0131r. Azot ve karbon tavanlar\u0131nda da ayn\u0131 durum ge\u00e7erli.<\/p>\n

Buna ra\u011fmen piyasa 1.4507’yi \u00e7o\u011fu zaman S32550 \/ F61 ile e\u015fle\u015ftirir — \u00e7\u00fcnk\u00fc stokta bulunan odur. Langley Alloys bunu a\u00e7\u0131k\u00e7a s\u00f6yl\u00fcyor: S32520 yayg\u0131n olarak stoklanmaz; haz\u0131r bulunan en yak\u0131n kalite S32550’dir.<\/em> Defence Metal \u00fcr\u00fcn sayfas\u0131 1.4507 \/ UNS S32520<\/strong> g\u00f6sterimini kullan\u0131r.<\/p>\n

Ve bir uyar\u0131 daha:<\/strong> ASTM’in kendi spesifikasyonlar\u0131 S32520 i\u00e7in farkl\u0131 s\u0131n\u0131rlar veriyor. ASTM A182 (d\u00f6vme, F59) molibdeni %3,0–5,0 ve bak\u0131r\u0131 %0,50–3,00’e kadar a\u00e7arken, ASTM A240 \/ A276 \/ A479 ayn\u0131 UNS i\u00e7in %3,0–4,0 ve %0,50–2,00 diyor. Sipari\u015fe hangi ASTM \u00fcr\u00fcn \u015fartnamesine g\u00f6re \u00e7al\u0131\u015ft\u0131\u011f\u0131n\u0131z\u0131 yaz\u0131n.<\/strong><\/p>\n<\/div>\n

Mekanik de\u011ferler — \u00e7\u00f6zeltiye al\u0131nm\u0131\u015f durum<\/h3>\n
\n\n\n\n\n\n\n\n\n\n\n
\u015eARTNAME \/ \u00dcR\u00dcN<\/th>\nRp0,2 min<\/th>\nRm min<\/th>\nA min<\/th>\nSertlik maks<\/th>\n<\/tr>\n<\/thead>\n
ASTM A240 levha — S32550<\/td>\n550 MPa (80 ksi)<\/td>\n760 MPa (110 ksi)<\/td>\n%15<\/td>\n302 HBW \/ 32 HRC<\/td>\n<\/tr>\n
ASTM A240 levha — S32520<\/td>\n550 MPa (80 ksi)<\/td>\n770 MPa (112 ksi)<\/td>\n%25<\/td>\n310 HBW<\/td>\n<\/tr>\n
EN 10088-3 \u00e7ubuk — 1.4507<\/td>\n500 MPa<\/td>\n700 – 900 MPa<\/td>\n%25<\/td>\n270 HB<\/td>\n<\/tr>\n
ASTM A182 d\u00f6vme — F61 (2 kurulu\u015f)<\/em><\/td>\n550 MPa (80 ksi)<\/td>\n750 MPa (109 ksi)<\/td>\n%25<\/td>\n\u015fart yok<\/td>\n<\/tr>\n
ASTM A182 d\u00f6vme — F59 (3 kurulu\u015f)<\/em><\/td>\n550 MPa (80 ksi)<\/td>\n770 MPa (112 ksi)<\/td>\n%25<\/td>\n\u015fart yok<\/td>\n<\/tr>\n
ASTM A479 \u00e7ubuk — S32550 (ASTM metni)<\/em><\/td>\n550 MPa (80 ksi)<\/td>\n760 MPa (110 ksi)<\/td>\n%15<\/td>\n297 HBW<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

Uzama fark\u0131na dikkat:<\/strong> ASTM A240’ta S32550 i\u00e7in %15, S32520 i\u00e7in %25’tir. Ayn\u0131 ticari ad\u0131 ta\u015f\u0131yan iki malzeme, ayn\u0131 standartta farkl\u0131 uzama \u015fart\u0131na tabidir.<\/p>\n

NORSOK M-630 \u015fartlar\u0131<\/h3>\n

Bu malzemelerin a\u00e7\u0131k deniz i\u015flerinde fiilen sat\u0131n al\u0131nd\u0131\u011f\u0131 \u015fartname NORSOK’tur. D\u00f6vme par\u00e7a (MDS D54) ve \u00e7ubuk (MDS D57) i\u00e7in \u015fartlar \u015funlard\u0131r (NORSOK M-630 metninin iki ayr\u0131 reprod\u00fcksiyonundan)<\/em>:<\/p>\n

\n\n\n\n\n\n\n\n\n\n\n\n\n\n
GEREKL\u0130L\u0130K<\/th>\nDE\u011eER<\/th>\n<\/tr>\n<\/thead>\n
PREN (= %Cr + 3,3×%Mo + 16×%N)<\/td>\n\u2265 40,0<\/td>\n<\/tr>\n
Is\u0131l i\u015flem<\/td>\n\u00e7\u00f6zeltiye alma tav\u0131 + su verme<\/strong><\/td>\n<\/tr>\n
Akma (Rp0,2) min<\/td>\n550 MPa<\/td>\n<\/tr>\n
\u00c7ekme (Rm) min<\/td>\n800 MPa<\/td>\n<\/tr>\n
Kopma uzamas\u0131 min<\/td>\n%15<\/td>\n<\/tr>\n
Charpy-V, −46 °C<\/td>\n45 J ortalama \/ 35 J tekil<\/td>\n<\/tr>\n
Sertlik<\/td>\n32 HRC alt\u0131 (301 HB veya 330 HV10)<\/td>\n<\/tr>\n
Ferrit i\u00e7eri\u011fi (ASTM E562)<\/td>\n%35 – 55<\/td>\n<\/tr>\n
Korozyon testi<\/td>\nASTM G48 Metot A, 50 °C, 24 saat — \u00e7ukurcuk yok, k\u00fctle kayb\u0131 < 4,0 g\/m²<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n
\n

NORSOK yaln\u0131zca S32550’yi ad\u0131yla an\u0131yor.<\/p>\n

MDS D54 ve D57 metinlerinde UNS S32520 ve EN 1.4507 ge\u00e7mez. “1.4507 NORSOK kapsam\u0131ndad\u0131r” ifadesi yaln\u0131zca S32550 \u00fczerinden do\u011frudur.<\/p>\n

Bir aritmetik not: ASTM band\u0131n\u0131n alt k\u00f6\u015fesi PREN 40’\u0131 tutmaz. S32550’nin alt k\u00f6\u015fesi (Cr 24,0 + Mo 2,9 + N 0,10) 38,2; S32520’ninki (24,0 + 3,0 + 0,20) 37,1 verir. ASTM’e uygun olmak PREN 40’\u0131 garanti etmez<\/strong> — NORSOK ve markalar bu y\u00fczden ayr\u0131ca “PRE \u2265 40” \u015fart ko\u015far ve kendi kimya bantlar\u0131n\u0131 daralt\u0131r.<\/p>\n<\/div>\n

\u00c7\u00f6zeltiye alma s\u0131cakl\u0131\u011f\u0131<\/h3>\n

S32520 \/ F59: 1080 – 1120 °C<\/strong> (ASTM A182 metni, IMOA ve Nickel Institute)<\/em>. S32550: 1040 °C<\/strong> (ASTM A479 metni ve IMOA)<\/em>; ASTM A182 grade F61 i\u00e7in 1050 – 1125 °C verilir. Hangi rakam olursa olsun su verme zorunludur<\/strong> — hi\u00e7bir \u015fartname havada so\u011futmaya izin vermez.<\/p>\n

Ek\u015fi servis sertlik s\u0131n\u0131r\u0131 da iki ayr\u0131 yerden gelir ve \u00e7ak\u0131\u015fmaz: NORSOK 32 HRC alt\u0131n\u0131 isterken, NACE MR0175 \/ ISO 15156 maksimum 28 HRC (270 HB)<\/strong> s\u0131n\u0131r\u0131 koyar (Langley Alloys)<\/em>. ASTM’in 302 HBW tavan\u0131na uymak ek\u015fi servis i\u00e7in yeterli de\u011fildir.<\/p>\n

Bu tablonun okunu\u015fu.<\/strong> Kaynak ad\u0131 yaz\u0131lmayan sat\u0131rlar en az d\u00f6rt ba\u011f\u0131ms\u0131z kurulu\u015fta do\u011frulanm\u0131\u015ft\u0131r. Parantez i\u00e7inde kurulu\u015f ad\u0131 ge\u00e7en sat\u0131rlar daha az say\u0131da kaynakta bulunabildi\u011fi i\u00e7in kayna\u011f\u0131yla birlikte veriliyor. Do\u011frulayamad\u0131\u011f\u0131m\u0131z hi\u00e7bir de\u011fer yaz\u0131lmam\u0131\u015ft\u0131r.<\/p>\n

PREN tart\u0131\u015fmas\u0131 — ticari olarak en \u00f6nemli b\u00f6l\u00fcm<\/h3>\n

S\u00fcper duplekslerde \u00e7ukurcuk direnci g\u00f6stergesi PREN’dir. Ama form\u00fclde tungstenin say\u0131l\u0131p say\u0131lmayaca\u011f\u0131 konusunda sekt\u00f6r ikiye b\u00f6l\u00fcnm\u00fc\u015ft\u00fcr.<\/strong><\/p>\n

Tungstensiz form\u00fcl<\/strong> (PREN = %Cr + 3,3×%Mo + 16×%N) kullananlar: Outokumpu, Alleima, Industeel, Sandmeyer Steel, ATI, Carpenter Technology, Smiths grubu, Columbia Metals ve — en \u00f6nemlisi — NORSOK M-630<\/strong>.<\/p>\n

Tungstenli form\u00fcl<\/strong> (PREN = %Cr + 3,3×(%Mo + 0,5×%W) + 16×%N) kullananlar: Rolled Alloys ve IMOA.<\/p>\n

Bunun al\u0131c\u0131 i\u00e7in anlam\u0131 \u015fudur: bu malzemelerin fiilen sat\u0131n al\u0131nd\u0131\u011f\u0131 en yayg\u0131n \u015fartname olan NORSOK M-630’un zorunlu PREN \u2265 40 hesab\u0131nda F55’in tungsteni say\u0131lmaz.<\/strong> “Tungsten sayesinde PREN daha y\u00fcksek” arg\u00fcman\u0131, \u015fartname d\u00fczeyinde \u00e7o\u011fu zaman ge\u00e7erli de\u011fildir.<\/p>\n

Sipari\u015f verirken dikkat<\/h3>\n
\n

“F255” bir ASTM g\u00f6sterimi de\u011fildir.<\/p>\n

“F255” piyasa jargonudur; ASTM A182’de b\u00f6yle bir harf-numaras\u0131 yoktur. Bu ticari ad i\u00e7in iki ayr\u0131 UNS numaras\u0131 dola\u015f\u0131mdad\u0131r: S32520 (ASTM A182 F59)<\/strong> ve S32550 (F61)<\/strong>. Bunlar farkl\u0131 numaralard\u0131r. Defence Metal \u00fcr\u00fcn sayfas\u0131 1.4507 \/ UNS S32520<\/strong> g\u00f6sterimini kullan\u0131r. Sipari\u015f ve sertifikada malzeme numaras\u0131n\u0131 ve UNS’i a\u00e7\u0131k\u00e7a yaz\u0131n, “F255” ile yetinmeyin.<\/p>\n<\/div>\n

\n

\u0130ki uyar\u0131 daha<\/p>\n

1.<\/strong> EN 1.4507 ile ASTM numaralar\u0131 otomatik e\u015fde\u011fer de\u011fildir — \u00f6zellikle nikel aral\u0131klar\u0131 neredeyse hi\u00e7 \u00f6rt\u00fc\u015fmez. E\u015fde\u011ferlik tablolar\u0131 rutin olarak yaz\u0131l\u0131r, ama \u00e7ift sertifikasyon kendili\u011finden gelmez.<\/p>\n

2.<\/strong> F55’in tungsteninde alt s\u0131n\u0131r<\/em> oldu\u011fundan emin olun. Baz\u0131 distrib\u00fct\u00f6rler tungsteni yaln\u0131zca “max %1,00” olarak yay\u0131ml\u0131yor; alt s\u0131n\u0131r yoksa tungsten i\u00e7ermeyen bir S32760 teslim edilebilir. Sipari\u015fe “W %0,50 – 1,00”<\/strong> yaz\u0131n.<\/p>\n<\/div>\n

\u00dcst s\u0131cakl\u0131k s\u0131n\u0131r\u0131<\/h3>\n

S\u00fcper dubleksler y\u00fcksek s\u0131cakl\u0131k ala\u015f\u0131m\u0131 de\u011fildir. Yay\u0131mlanan \u00fcst servis s\u0131cakl\u0131klar\u0131 270 – 316 °C<\/strong> band\u0131nda da\u011f\u0131l\u0131r (Industeel 270 °C, Langley 275 °C, Rolled Alloys 300 °C, IMOA\/ASME 315 °C). Sebep, ferrit faz\u0131ndaki alfa-prime \u00e7\u00f6kelmesinin (“475 °C k\u0131r\u0131lganl\u0131\u011f\u0131”) toklu\u011fu d\u00fc\u015f\u00fcrmesidir.<\/p>\n

Hangisi nerede?<\/h3>\n

F255:<\/strong> g\u00fcbre tesisleri, fosforik ve s\u00fclf\u00fcrik asit prosesleri, baca gaz\u0131 k\u00fck\u00fcrt giderme, ka\u011f\u0131t hamuru, tuzdan ar\u0131nd\u0131rma, pompa ve vanalar, deniz pervaneleri ve \u015faftlar\u0131.<\/p>\n

F55:<\/strong> petrol-gaz prosesi ve deniz suyu sistemleri, denizalt\u0131 sistemleri, vanalar, manifoldlar, flan\u015flar ve c\u0131vatalar, madencilik.<\/p>\n

K\u0131saca: asit ortam\u0131 varsa bak\u0131r (F255), deniz suyu sistemi ise F55<\/strong> taraf\u0131na bak\u0131l\u0131r.<\/p>\n

G\u00f6sterimler, standartlar ve AMS kar\u015f\u0131l\u0131klar\u0131<\/h3>\n

Ayn\u0131 \u00e7elik, hangi sistemde konu\u015ftu\u011funuza g\u00f6re farkl\u0131 isimle an\u0131l\u0131r. Sipari\u015f ve sertifika kar\u0131\u015f\u0131kl\u0131klar\u0131n\u0131n \u00e7o\u011fu buradan \u00e7\u0131kar, o y\u00fczden k\u0131saca \u00f6zetleyelim:<\/p>\n