Saky Steel samar da jerin 440 masu tauri martensitic bakin karfe zanen gado da faranti 440A, 440B, 440C
AISI 440A, UNS S44002, JIS SUS440A, W.-nr. 1.4109 ( DIN X70CrMo15 ) zanen ƙarfe na bakin ƙarfe, faranti, da lebur
AISI 440B, UNS S44003, JIS SUS440B, W.-nr. 1.4112 ( DIN X90CrMoV18 ) zanen ƙarfe na bakin ƙarfe, faranti, da lebur
AISI 440C, UNS S44004, JIS SUS440C, W.-nr. 1.4125 ( DIN X105CrMo17 ) zanen ƙarfe na bakin ƙarfe, faranti, da lebur
Sinadarin sinadarai na 440A 440B 440C:
| Matsayi | 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 | 0.85～0.95 | ≤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 |
Yawan sinadarin carbon da taurin 440A-440B-440C ya ƙaru a jere daga ABC (A-0.75%, B-0.9%, C-1.2%). 440C ƙarfe ne mai kyau mai ƙarfi wanda ke da taurin 56-58 RC. Waɗannan ƙarfe uku suna da juriyar tsatsa mai kyau, 440A shine mafi kyau, kuma 440C shine mafi ƙanƙanta. 440C abu ne da aka saba gani. Sinadarin sinadarai na ƙarfen martensitic yana da alaƙa da ƙara abubuwa kamar molybdenum, tungsten, vanadium, da niobium bisa ga haɗin sassa daban-daban na 0.1%-1.0% C da 12%-27% Cr. Tunda tsarin nama tsari ne mai siffar jiki, ƙarfin yana raguwa sosai a yanayin zafi mai yawa. Ƙasa da 600 ° C, ƙarfin zafin jiki mai girma shine mafi girma a cikin dukkan nau'ikan ƙarfe mai launin shuɗi, kuma ƙarfin rarrafe shi ma shine mafi girma. 440A yana da kyawawan halaye na kashewa da taurarewa da kuma babban tauri. Yana da ƙarfi fiye da ƙarfe 440B da ƙarfe 440C. Ana amfani da 440B don kayan aikin yankewa, kayan aikin aunawa, bearings da bawuloli. Yana da ƙarfi fiye da ƙarfe 440A kuma yana da ƙarfi fiye da ƙarfe 440C. 440C yana da ƙarfi mafi girma fiye da dukkan ƙarfe mai bakin ƙarfe da ƙarfe mai jure zafi kuma ana amfani da shi don bututu da bearings. 440F wani nau'in ƙarfe ne wanda ke inganta halayen sassauƙa na ƙarfe 440C don lathes na atomatik.
Lokacin Saƙo: Agusta-17-2018