After welding on all sides of cleaned two 300 mm x 2 000 mm x 4 000 mm casting slabs to 585 ~ 595 mm stock in vacuum chamber

and heating at 1 200 ℃

the 300 ~ 410 mm clad heavy plate of steel SM45 (/% ：0. 42 ~ 0. 48C

0.17 ~0. 37Si

0. 50 ~ 0. 80Mn

≤0. 030P

≤0. 035S) is rolled with beginning rolling at > 1100 ℃

rolling speed 1. 0 ~1. 2 m/s and pass reduction more than 45 mm

after rolling the clad plate is slow-cooling for 48 h. The degree of combination and mechanical properties of clad plate is examined by ultrasonic inspection

structure analysis

cold bending

tensile

impact and hardness test. Results show that the metallographic structure of clad steel plate is ferrite and pearlite

the combination of steel plate is nice and there is no obvious defect; the tensile strength of clad steel plate is 600 ~675 MPa

and the tensile strength of specimen at Z direction of clad interface is 612 ~ 661 MPa.