Saky Steel inogadzira machira esimbi asina kusimba emartensitic anoomesesa ane masimbi 440 akatevedzana uye maplate 440A, 440B, 440C
AISI 440A, UNS S44002, JIS SUS440A, W.-nr. 1.4109 (DIN X70CrMo15) machira esimbi isina ngura, maplate, maflat
AISI 440B, UNS S44003, JIS SUS440B, W.-nr. 1.4112 (DIN X90CrMoV18) machira esimbi isina ngura, maplate, maflat
AISI 440C, UNS S44004, JIS SUS440C, W.-nr. 1.4125 (DIN X105CrMo17) machira esimbi isina ngura, maplate, maflat
440A 440B 440C chikamu chemakemikari:
| Giredhi | 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 |
Kuwanda kwekabhoni uye kuomarara kwe440A-440B-440C kwakawedzera zvichitevedzana kubva kuABC (A-0.75%, B-0.9%, C-1.2%). 440C isimbi isina ngura yakanaka kwazvo ine kuomarara kwe56-58 RC. Idzi simbi nhatu dzine simba rekudzivirira ngura, 440A ndiyo yakanakisa, uye 440C ndiyo yakaderera. 440C yakajairika. Kuumbwa kwemakemikari esimbi isina ngura yemartensitic kunoratidzwa nekuwedzerwa kwezvinhu zvakaita semolybdenum, tungsten, vanadium, uye niobium zvichibva pakusanganiswa kwezvikamu zvakasiyana zve0.1%-1.0% C uye 12%-27% Cr. Sezvo chimiro chetishu chiri chimiro che cubic chiri pakati pemuviri, simba rinodonha zvakanyanya pakupisa kwakanyanya. Pasi pe600 ° C, simba rekupisa rakakwirira ndiro rakakwirira pakati pemhando dzese dzesimbi isina ngura, uye simba re creep ndiro rakakwirirawo. 440A ine hunhu hwakanaka hwekudzima nekuomesa uye kuomarara kwakanyanya. Ine hunhu hwakanyanya kusimba kupfuura simbi ye440B nesimbi ye440C. 440B inoshandiswa pakucheka maturusi, maturusi ekuyera, mabheringi nemavharuvhu. Ine hunhu hwakanyanya kusimba kupfuura simbi ye440A uye kuomarara kupfuura simbi ye440C. 440C ine hunhu hwakanyanya kusimba kupfuura simbi dzese dzisina ngura uye dzinodzivirira kupisa uye inoshandiswa kuma nozzles nemabheringi. 440F imhando yesimbi inovandudza hunhu hwesimbi ye440C huri nyore kucheka hwema lathes otomatiki.
Nguva yekutumira: Nyamavhuvhu-17-2018