ASTM 440C Stainless Hlau: Siab -Carbon Martensitic Qib rau siab tshaj plaws hardness thiab hnav tsis kam

1.4125 (440C) Bar

Qib 440C muaj peev xwm ua tau, tom qab kev kho cua sov, lub zog siab tshaj plaws, hardness thiab hnav tsis kam ntawm tag nrho cov hlau stainless. Nws cov ntsiab lus carbon siab heev yog lub luag haujlwm rau cov yam ntxwv no, uas ua rau 440C tshwj xeeb rau cov ntawv thov xws li pob bearings thiab valve qhov chaw.

Qib 440A thiab 440B zoo ib yam tshwj tsis yog cov ntsiab lus qis dua me ntsis (0.60 - 0.75% thiab 0.75 - 0.95% feem); Cov no muaj qis attainable hardnesses tab sis me ntsis siab dua corrosion kuj. Txawm hais tias tag nrho peb cov qauv ntawm qib no yog cov qib txheem, hauv kev xyaum 440C muaj ntau dua li A lossis B sib txawv.

Ib qho dawb -machining variant 440F (UNS S44020) kuj muaj, nrog rau cov ntsiab lus carbon siab tib yam li 440C. Ib zaug ntxiv, qib no tsis muaj nyob hauv Australia.

Martensitic stainless hlau yog optimized rau siab hardness, thiab lwm yam khoom yog ib co℃cuam tshuam. Fabrication yuav tsum yog los ntawm cov txheej txheem uas tso cai rau cov weldability tsis zoo thiab feem ntau kuj tso cai rau qhov kawg harden thiab temper kub kho. Corrosion tsis kam yog qis dua cov qib austenitic, thiab lawv qhov kev ua haujlwm kub muaj txiaj ntsig raug txwv los ntawm lawv qhov poob ntawm qhov dej ntawm sub- xoom kub thiab poob ntawm lub zog los ntawm ntau dua - tempering ntawm qhov kub siab.