Introduction to the
439 steel grade is in general ferrite materials (430) to reduce the content of C, on the basis of the stabilizing element such as join Ti at the same time, make the steel intergranular corrosion resistance, formability and weldability are improved. Compared with 304 steel, the elongation rate is lower (30% or so), but the strength, corrosion resistance and corrosion resistance are better than 200 series materials.
Chemical composition
National standard brand chemical composition (%)
C Si Mn P S Cr Ni N Ti
Or less
ASTM 439 0.03 1.00 0.03 0.03 17.0-19.0 is less than or equal to 0.04 0.2+4(C+N)-1.10
Germany DIN 1.4510 0.01 0.01 0.04 0.015 16.0-18.0-4 (C+N)-0.80
Mechanical properties of
Standard mechanical properties
Tensile strength yield strength elongation hardness
N/m ㎡ (or less) N/m ㎡ (or greater) % (or less) HV
ASTM is greater than 415, 205, 205, 180
DIN 420-600, 230, 23
The main purpose
Elevator, escalator decoration board
Architectural decorative boards, such as decorative structural pieces, structural tubes
Automobile exhaust system components
Washing machine