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Bakin karfen ƙarfe ne mai ƙarfi wanda ke da juriya mai ƙarfi idan aka kwatanta da sauran karafa saboda kasancewar chromium mai yawa. Dangane da tsarin crystalline, sun kasu kashi uku kamar Ferritic, Austenitic, da Martentitic. Wani rukuni na bakin karafa sune hazo-taurare karafa. Su ne hade da martensitic da austenitic karfe.
Grade 440C bakin karfe babban carbon martensitic bakin karfe. Yana da babban ƙarfi, matsakaicin juriya na lalata, da tauri mai kyau da juriya. Grade 440C yana da ikon kaiwa, bayan magani mai zafi, mafi girman ƙarfi, tauri da juriya na duk abubuwan da ba su da ƙarfi. Babban abun ciki na carbon da ke da alhakin waɗannan halaye, wanda ke sanya 440C musamman dacewa da irin waɗannan aikace-aikacen kamar ƙwanƙwasa ƙwallon ƙafa da sassan bawul.
Kemikal Haɗin Kai na 440C bakin karfe
| Babban darajar 440C | ||
| Sinadaran | Min. | Max. |
| Carbon | 0.95 | 1.20 |
| Manganese | - | 1.00 |
| Siliki | - | 1.00 |
| Phosphorus | - | 0.040 |
| Sulfur | - | 0.030 |
| Chromium | 16.00 | 18.00 |
| Molybdenum | - | 0.75 |
| Iron | Ma'auni | |
Kaddarorin jiki don bakin karfe 440
| Daraja | Yawan yawa (kg/m3) | Elastic Modulus (GPa) | Ma'anar Ƙirar Ƙarfafawar Ƙwararrun Ƙwararru (mm/m/C) | Ƙarfafa Ƙarfafawa (W/m.K) | Takamaiman Zafi 0-100C (J/kg.K) |
Resistivity na Lantarki (nW.m) | |||
| 0-100C | 0-200C | 0-600C | ku 100C | ku 500c | |||||
| 440A/B/C | 7650 | 200 | 10.1 | 10.3 | 11.7 | 24.2 | - | 460 | 600 |
Abubuwan da suka danganci 440C
| Amurka | Jamus | Japan | Ostiraliya |
| ASTM A276-98b 440C SAE 51440C AISI 440C Saukewa: UNS44004 |
1.4125 X105CrMo17 | JIS G4303 SuS 440C | AS 2837-1986 440C |
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