Cam khwb cia hlau manhole npog tau muab faib ua cov hlau hlau manhole npog thiab grey hlau manhole npog, feem ntau hais lus, tib qhov hnyav ntawm cov hlau hlau manhole npog dua li grey hlau manhole npog lub siab tsis kam.Cov ntaub ntawv siv rau grey hlau manhole npog feem ntau yog HT200, thiab cov khoom siv rau cov kua mem hluav manhole npog feem ntau yog QT500-7.

Cov yam ntxwv ntawm spheroidal number case manhole npog:

Zoo toughness.Tus nqi cuam tshuam zoo ib yam li cov pa roj carbon nruab nrab thiab ntau dua 10 npaug ntawm cov hlau grey.

Muaj zog corrosion kuj.Dej tshuaj tsuag corrosion test, 90 hnub ntawm corrosion tsuas yog 1/40 steel yeeb nkab, yog 1/10 grey hlau yeeb nkab.Kev pabcuam lub neej yog 2 npaug ntawm cov yeeb nkab hlau grey thiab 5 npaug ntawm cov yeeb nkab steel.

Zoo plasticity.Elongation≥7%, zoo ib yam li cov khoom siv carbon siab, thaum grey hlau cov khoom elongation yog xoom.

Siab zog.Tensile zog ob≥420MPa, yield zog os≥300MPa, thiab cov pa roj carbon tsawg yog tib yam, yog peb zaug ntawm cov khoom siv hlau grey.

Daim ntawv thov: txoj kev hauv nroog, txoj kev loj, kev sib txuas lus, hluav taws xob, dej kais dej, zej zog, tsev kawm ntawv thiab lwm qhov chaw ua si.