Saky Karfe samar 440 jerin hardenable martensitic bakin karfe zanen gado & faranti 440A, 440B, 440C
AISI 440A, UNS S44002, JIS SUS440A, W.-nr. 1.4109 (DIN X70CrMo15) bakin karfe zanen gado, faranti, lebur
AISI 440B, UNS S44003, JIS SUS440B, W.-nr. 1.4112 (DIN X90CrMoV18) bakin karfe zanen gado, faranti, lebur
AISI 440C, UNS S44004, JIS SUS440C, W.-nr. 1.4125 (DIN X105CrMo17) bakin karfe zanen gado, faranti, lebur
440A 440B 440C bangaren sinadaran:
| Daraja | C | Si | Mn | S | P | Cr | Ni | Mo |
| 440A | 0.60 ~ 0.75 | ≤1 | ≤1 | ≤0.030 | ≤0.040 | 16.00 ~ 18.00 | - | ≤0.75 |
| 440B | 0.85 zuwa 0.95 | ≤1 | ≤1 | ≤0.030 | ≤0.035 | 16.00 ~ 18.00 | ≤0.60 | ≤0.75 |
| 440C | 0.95 - 1.20 | ≤1 | ≤1 | ≤0.030 | ≤0.040 | 16.00 ~ 18.00 | - | ≤0.75 |
Abubuwan da ke cikin carbon da taurin 440A-440B-440C sun karu a jere daga ABC (A-0.75%, B-0.9%, C-1.2%). 440C babban bakin karfe ne mai matukar kyau tare da taurin 56-58 RC. Wadannan karfe uku suna da juriya mai kyau, 440A shine mafi kyau, kuma 440C shine mafi ƙasƙanci. 440C yana da yawa. Abubuwan da ke tattare da sinadarai na bakin karfe na martensitic yana da alaƙa da ƙarin abubuwa kamar molybdenum, tungsten, vanadium, da niobium dangane da haɗuwa daban-daban na 0.1% -1.0% C da 12% -27% Cr. Tun da tsarin nama shine tsarin cubic mai tushen jiki, ƙarfin yana raguwa sosai a yanayin zafi. A ƙasa da 600 ° C, ƙarfin zafin jiki shine mafi girma tsakanin kowane nau'in bakin karfe, kuma ƙarfin rarrafe kuma shine mafi girma. 440A yana da kyau kwarai quenching da hardening Properties da high taurin. Yana da mafi girma tauri fiye da 440B karfe da 440C karfe. Ana amfani da 440B don yankan kayan aiki, kayan aikin aunawa, bearings da bawuloli. Yana da mafi girma taurin fiye da 440A karfe da mafi girma tauri fiye da 440C karfe. 440C yana da mafi girman taurin duk bakin karfe da karfe mai jure zafi kuma ana amfani dashi don nozzles da bearings. 440F matakin karfe ne wanda ke haɓaka kaddarorin sassauƙan yanke ƙarfe na 440C don lathes ta atomatik.
Lokacin aikawa: Agusta-17-2018