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Common Technical Standards for Domestic Valve Materials Technical Conditions of Ductile Iron and Mechanical Properties of Cast Specimens


Release time:

2018-03-02

Common Technical Standards for Domestic Valve Materials Technical Conditions of Ductile Iron and Mechanical Properties of Cast Specimens

Common Technical Standards for Domestic Valve Materials Technical Conditions of Ductile Iron and Mechanical Properties of Cast Specimens

Brand Casting wall thickness/mm

Tensile Strength

Sb/MPa

Yield strength

S0.2/MPa

Elongation δ/%

Reference value
Hardness HB main metallographic structure
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
    Note: The letter "A" indicates the mechanical properties of the grade measured on the attached cast sample to distinguish the mechanical properties measured on the single cast sample.