鋼級和化學成份( %)

鋼級

碳≤

錳

硅

磷≤

硫≤

鉻≤

鉬≤

ST35.8

0.17

0.40~0.80

0.10~0.35

0.030

0.030

ST45.8

0.21

0.40~1.20

0.10~0.35

0.030

0.030

Mechanical Properties

Grade

Tensile Strength (Mpa)

Yield Point (Mpa)

Elongation (%)

ST35.8

360~480

≧235

≧25

ST45.8

410~530

≧255

≧21