Technical Articles
Domestic Valve Materials Frequently-used Technical Standard, Ductile Iron Specification, Mechanical Property
Posted: 01/11/2017 10:36:24  Hits: 50

Domestic valve materials frequently-used technical standard, ductile iron specification and mechanical property
 
Grade Wall Thickness/mm Tensile Strength
σb/MPa
Yield Strength
σ0.2/MPa
Elongation
δ/%
Reference Value
HardnessHB Main Microstructure
QT400-18 >30~60 390 250 18 130~180 Ferrite
>60~200 370 240 12
QT400-15A >30~60 390 250 15 130~180 Ferrite
>60~200 370 240 12
QT500-7A >30~60 450 300 7 170~240 Ferrite+Pearlite
>60~200 420 290 5