میانگین هزینه مقاومت حرارتی astm a479
ASTM A479_A479M-21 Standard Specification for Stainless … : Designation: A479/A479M − 21 Used in USDOE-NE StandardsStandard Specif i cation forStainless Steel Bars and Shapes for Use in Boilers andOther Pressure Vessels 1This standard is issued under the f i xed designation A479/A479M; the number immediately following the …