Ibyuma bya Saky ibyuma bya Martensitike ni ibyuma bya chromium idafite ibyuma bikomeza microstructure ya martensitike ku bushyuhe bwicyumba, imitungo yayo ishobora guhindurwa no kuvura ubushyuhe (kuzimya no gutwarwa).Muri rusange, ni ubwoko bwicyuma gikomeye.Nyuma yo kuzimya, gutondeka no gufata annealing, Ubukomezi bwibyuma 440 butagira umuyonga bwaratejwe imbere cyane kuruta ubundi bwuma butagira umwanda nubushyuhe.Bikunze gukoreshwa mugukora ibikoresho, gukata, cyangwa ibishushanyo bya pulasitike bisaba imizigo myinshi kandi birwanya kwihanganira ibintu byangirika.Abanyamerika basanzwe 440 urukurikirane rwicyuma rurimo: 440A, 440B, 440C, 440F.Ibirimo bya karubone bya 440A, 440B na 440C byiyongereye bikurikiranye.440F (ASTM A582) ni ubwoko bwibyuma byo gukata kubuntu hamwe nibirimo S byongeweho hashingiwe kuri 440C.
Ibyiciro bingana na 440 SS
| Umunyamerika | ASTM | 440A | 440B | 440C | 440F |
| UNS | S44002 | S44003 | S44004 | S44020 | |
| Ikiyapani | JIS | SUS 440A | SUS 440B | SUS 440C | SUS 440F |
| Ikidage | DIN | 1.4109 | 1.4122 | 1.4125 | / |
| Ubushinwa | GB | 7Cr17 | 8Cr17 | 11Cr17 9Cr18Mo | Y11Cr17 |
Ibigize imiti ya 440 SS
| Impamyabumenyi | C | Si | Mn | P | S | Cr | Mo | Cu | Ni |
| 440A | 0.6-0.75 | .00.00 | .00.00 | ≤0.04 | ≤0.03 | 16.0-18.0 | ≤0.75 | (≤0.5) | (≤0.5) |
| 440B | 0.75-0.95 | .00.00 | .00.00 | ≤0.04 | ≤0.03 | 16.0-18.0 | ≤0.75 | (≤0.5) | (≤0.5) |
| 440C | 0.95-1.2 | .00.00 | .00.00 | ≤0.04 | ≤0.03 | 16.0-18.0 | ≤0.75 | (≤0.5) | (≤0.5) |
| 440F | 0.95-1.2 | .00.00 | ≤1.25 | ≤0.06 | ≥0.15 | 16.0-18.0 | / | (≤0.6) | (≤0.5) |
Icyitonderwa: indangagaciro ziri mumutwe ziremewe kandi ntabwo ari itegeko.
Ubukomezi bwa 440 SS
| Impamyabumenyi | Gukomera, Annealing （HB） | Kuvura ubushyuhe （HRC） |
| 440A | 2555 | ≥54 |
| 440B | 2555 | ≥56 |
| 440C | ≤269 | ≥58 |
| 440F | ≤269 | ≥58 |
Kimwe nicyuma gisanzwe kivanze, ibyuma bya Saky ibyuma 440 bya Martensite ibyuma bitagira umuyonga bifite ibiranga gukomera binyuze mu kuzimya, kandi birashobora kubona ibintu byinshi byubukanishi hakoreshejwe uburyo butandukanye bwo kuvura ubushyuhe.Muri rusange, 440A ifite imikorere ikomeye yo gukomera no gukomera cyane, kandi ubukana bwayo burenze ubwa 440B na 440C.440B ifite ubukana nuburemere burenze 440A na 440C kuri ibikoresho byo gukata, ibikoresho byo gupima, ibyuma na valve.440C ifite ubukana buhanitse bwibyuma byose bidafite ingese hamwe nicyuma cyihanganira ubushyuhe kubikoresho byiza byo gukata neza, nozzles hamwe na bearings.440F nicyuma gikata kubuntu kandi gikoreshwa cyane mumisarani yikora.
Igihe cyo kohereza: Nyakanga-07-2020