Saky Steel waxay soo saartaa 440 taxane ah oo adag oo martensitic ahama bir ah & taargooyin 440A, 440B, 440C
AISI 440A, UNS S44002, JIS SUS440A, W.-nr. 1.4109
AISI 440B, UNS S44003, JIS SUS440B, W.-nr. 1.4112
AISI 440C, UNS S44004, JIS SUS440C, W.-nr. 1.4125
440A 440B 440C qayb kiimikaad:
| Darajo | C | Si | Mn | S | P | Cr | Ni | Mo |
| 440A | 0.60 ~ 0.75 | ≤1 | ≤1 | ≤0.030 | ≤0.040 | 16.00 ilaa 18.00 | - | ≤0.75 |
| 440B | 0.85 ilaa 0.95 | ≤1 | ≤1 | ≤0.030 | ≤0.035 | 16.00 ilaa 18.00 | ≤0.60 | ≤0.75 |
| 440C | 0.95 - 1.20 | ≤1 | ≤1 | ≤0.030 | ≤0.040 | 16.00 ilaa 18.00 | - | ≤0.75 |
Waxa ku jira kaarboonka iyo adkaanta 440A-440B-440C ayaa si isdaba joog ah uga kordhay ABC (A-0.75%, B-0.9%, C-1.2%). 440C waa bir aan-dhamaadka sare aad u wanaagsan oo leh 56-58 RC adag. Saddexdan bir waxay leeyihiin iska caabin wanaagsan oo miridhku, 440A ayaa ugu fiican, iyo 440C waa kan ugu hooseeya. 440C waa mid aad u badan. Halabuurka kiimikaad ee birta aan lahayn martensitic waxaa lagu gartaa marka lagu daro curiyeyaasha sida molybdenum, tungsten, vanadium, iyo niobium oo ku salaysan isku darka qaybaha kala duwan ee 0.1% -1.0% C iyo 12% -27% Cr. Maadaama qaab-dhismeedka unuggu uu yahay qaab-dhismeed cubic ah oo jidhka ku salaysan, xooggu si aad ah ayuu hoos ugu dhacayaa heerkulka sare. Ka hooseeya 600 ° C, xoogga heerkulka sare ayaa ah kan ugu sarreeya dhammaan noocyada birta aan fiicnayn, iyo xoogga gurguurta ayaa sidoo kale ah kan ugu sarreeya. 440A waxay leedahay deminta iyo qallafsanaanta aad u fiican iyo engegnaanta sare. Waxay leedahay adayg ka sarreeya birta 440B iyo birta 440C. 440B waxaa loo isticmaalaa in lagu gooyo qalabka, qalabka cabbirka, xajmiyada iyo valves. Waxay leedahay qallafsanaan ka sarreeya 440A birta iyo adayga ka sarreeya birta 440C. 440C waxa ay leedahay engegnaanta ugu saraysa ee dhamaan birta aan birta lahayn iyo birta u adkaysata kulaylka waxaana loo isticmaalaa birta iyo birta. 440F waa darajo bir ah oo wanaajisa sifooyinka fudud ee 440C ee birta si toos ah
Waqtiga boostada: Agoosto-17-2018