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Material
40B
Standard
GB /T 3077-1999
Alloy Structure Steels
Standard
GB /T 3077-2015
Alloy structure steels
Standard
GB /T 3078-2019
Quality structural steel cold drawm bars
Chemical Composition
(%)
Standard
Material Designation
Chemical Composition (%)
GB /T 3077-1999
Alloy Structure Steels
40B
(
A70402
)
Min
Max
GB /T 3078-2019
Quality structural steel cold drawm bars
40B
Min
Max
GB /T 3077-2015
Alloy structure steels
40B
(
A70402
)
Min
Max
For Reference Only
