Birta Saky Martensitic ahama waa nooc ka mid ah birta aan lahayn chromium kaas oo ilaalinaya qaab-dhismeed yar oo martensitic heerkulka qolka, kuwaas oo hantidooda lagu hagaajin karo daawaynta kulaylka (dejinta iyo xanaaqa). Guud ahaan marka loo hadlo, waa nooc ka mid ah birta aan la adkeyn karin. Ka dib deminta, xanaaqa iyo habka dib u dhigista, adkaanta 440 birta aan fiicnayn ayaa si weyn loo hagaajiyay marka loo eego kuwa kale ee aan lahayn iyo kulaylka u adkaysta. Waxaa caadi ahaan loo adeegsadaa soo saarista xajinta, qalabka goynta, ama caagagga caaga ah ee u baahan culaysyo badan oo xidha caabbinta xaaladaha daxalka. Heerka American 440 taxane ahama bir ah oo ay ku jiraan: 440A, 440B, 440C, 440F. Kaarboonka 440A, 440B iyo 440C ayaa si isdaba joog ah u kordhay. 440F (ASTM A582) waa nooc ka mid ah birta goynta bilaashka ah oo leh nuxurka S oo lagu daray 440C.
Fasalada u dhigma ee 440 SS
| Maraykan | ASTM | 440A | 440B | 440C | 440F |
| UNS | S44002 | S44003 | S44004 | S44020 | |
| Jabbaan | JIS | SUS 440A | SUS 440B | SUS 440C | SUS 440F |
| Jarmal | DIN | 1.4109 | 1.4122 | 1.4125 | / |
| Shiinaha | GB | 7Cr17 | 8Cr17 | 11Cr17 9Cr18Mo | Y11Cr17 |
Halabuurka Kiimikada ee 440 SS
| Darajooyinka | C | Si | Mn | P | S | Cr | Mo | Cu | Ni |
| 440A | 0.6-0.75 | ≤1.00 | ≤1.00 | ≤0.04 | ≤0.03 | 16.0-18.0 | ≤0.75 | (≤0.5) | (≤0.5) |
| 440B | 0.75-0.95 | ≤1.00 | ≤1.00 | ≤0.04 | ≤0.03 | 16.0-18.0 | ≤0.75 | (≤0.5) | (≤0.5) |
| 440C | 0.95-1.2 | ≤1.00 | ≤1.00 | ≤0.04 | ≤0.03 | 16.0-18.0 | ≤0.75 | (≤0.5) | (≤0.5) |
| 440F | 0.95-1.2 | ≤1.00 | ≤1.25 | ≤0.06 | ≥0.15 | 16.0-18.0 | / | (≤0.6) | (≤0.5) |
Fiiro gaar ah: qiyamka ku jira xidhmooyinka waa la oggol yahay mana aha qasab.
Adag ee 440 SS
| Darajooyinka | Hardness, Annealing (HB) | Daaweynta kulaylka (HRC) |
| 440A | ≤255 | ≥54 |
| 440B | ≤255 | ≥56 |
| 440C | ≤269 | ≥58 |
| 440F | ≤269 | ≥58 |
Si la mid ah birta daawaha caadiga ah, Saky steel's 440 taxane Martensite ahama birta ah waxay leedahay sifooyin qallafsanaan iyada oo loo marayo deminta, waxayna heli kartaa noocyo kala duwan oo qalab farsamo ah iyada oo loo marayo daaweynta kulaylka kala duwan. Guud ahaan, 440A waxa ay leedahay wax qabad adag oo adag iyo adkeysi aad u saraysa, adaygeeduna waxa uu ka sareeyaa 440B iyo 440C. 440B waxa uu leeyahay qallafsanaan sare iyo adayg ka badan 440A iyo 440C waayo qalabka wax lagu gooyo, qalabka wax lagu cabbiro, xajmiyada iyo baallooyinka. 440C waxay leedahay qallafsanaanta ugu sareysa ee dhammaan birta aan fiicnayn iyo kulaylka u adkeysata qalabka tayada sare leh ee wax lagu gooyo, nozzles iyo birta. 440F waa bir goynta bilaashka ah oo inta badan loo isticmaalo laysarka tooska ah.
Waqtiga boostada: Jul-07-2020