Saky Steel tsim 440 series hardenable martensitic stainless hlau nplooj ntawv & daim hlau 440A, 440B, 440C
AISI 440A, UNS S44002, JIS SUS440A, W.-nr. 1.4109 (DIN X70CrMo15) stainless hlau nplooj ntawv, daim hlau, flats
AISI 440B, UNS S44003, JIS SUS440B, W.-nr. 1.4112 (DIN X90CrMoV18) stainless hlau nplooj ntawv, daim hlau, flats
AISI 440C, UNS S44004, JIS SUS440C, W.-nr. 1.4125 (DIN X105CrMo17) stainless hlau nplooj ntawv, daim hlau, flats
440A 440B 440C tshuaj tiv thaiv:
| Qib | C | Si | Mn | S | P | Cr | Ni | Mo |
| 440a ua | 0.60 ~ 0.75 hli | ≤1 | ≤1 | ≤ 0.030 | ≤ 0.040 | 16.00 – 18.00 Nws | - | ≤ 0.75 |
| 440b ua | 0.85 ~ 0.95 hli | ≤1 | ≤1 | ≤ 0.030 | ≤ 0.035 | 16.00 – 18.00 Nws | ≤ 0.60 | ≤ 0.75 |
| 440c ua | 0.95-1.20 Nws | ≤1 | ≤1 | ≤ 0.030 | ≤ 0.040 | 16.00 – 18.00 Nws | - | ≤ 0.75 |
Cov ntsiab lus carbon thiab hardness ntawm 440A-440B-440C nce zuj zus los ntawm ABC (A-0.75%, B-0.9%, C-1.2%). Lub 440C yog ib qho zoo heev high-end stainless hlau nrog ib tug hardness ntawm 56-58 RC. Peb cov hlau no muaj cov xeb zoo, 440A yog qhov zoo tshaj plaws, thiab 440C yog qhov qis tshaj. 440C yog qhov ntau heev. Cov tshuaj muaj pes tsawg leeg ntawm martensitic stainless hlau yog tus cwj pwm los ntawm kev sib ntxiv ntawm cov khoom xws li molybdenum, tungsten, vanadium, thiab niobium raws li kev sib xyaw ntawm cov khoom sib txawv ntawm 0.1% -1.0% C thiab 12% -27% Cr. Txij li cov qauv ntawm cov ntaub so ntswg yog ib lub cev-centered cubic qauv, lub zog poob sharply ntawm qhov kub thiab txias. Hauv qab 600 ° C, qhov kub thiab txias lub zog yog qhov siab tshaj plaws ntawm txhua hom stainless hlau, thiab lub zog creep kuj yog siab tshaj. 440A muaj zoo heev quenching thiab hardening zog thiab siab hardness. Nws muaj zog dua 440B steel thiab 440C steel. 440B yog siv rau kev txiav cov cuab yeej, ntsuas cov cuab yeej, bearings thiab li qub. Nws muaj hardness siab dua 440A steel thiab siab zog dua 440C steel. Lub 440C muaj qhov hardness siab tshaj plaws ntawm tag nrho cov hlau tsis muaj steel thiab kub-resistant steel thiab yog siv rau nozzles thiab bearings. 440F yog qib steel uas txhim kho cov cuab yeej txiav yooj yim ntawm 440C steel rau cov tshuab dhos tsis siv neeg.
Post lub sij hawm: Aug-17-2018