What is the difference between Bisplate450 and Bisplate400 steel plate

The difference between Bisplate450 and Bisplate400 steel plate is that the chemical element composition is different, and the hardness value is also different. The hardness value of Bisplate450 is 425-475HBW, and the hardness value of Bisplate400 is 370-430HBW.

Bisplate450 steel plate chemical elements, melting analysis:

Grade	Thickness	C	P	Mn	Si	S	Cr	Mo	B	CE (Ⅱw)	CET
Bisplate450	6mm-50mm	0.25-0.26	0.02	1.2-1.35	0.8	0.006	0.9	0.30-0.40	0.0022	0.45-0.55	0.30-0.37

Bisplate400 steel plate finished product analysis, chemical elements:

Grade	Thickness (mm)	C	P	Mn	Si	S	Cr	Mo	B	CE(Ⅱw)	CET
Bisplate400	≤5mm-16mm	0.20	0.025	1.5	0.30	0.008	0.50	0.35	0.002	0.38	0.29
	≥16mm-80mm	0.22	0.025	1.6	0.25	0.008	0.3	0.25	0.002	0.48	0.35
	≥80mm-100mm	0.22	0.025	1.6	0.090	0.008	1.5	0.65	0.003	0.58	0.35

Bisplate450 steel plate impact test:

V-Charpy impact toughness
Thickness (mm)	Specimen (mm)	-40℃longitudinal impact minimum energy value
6-8	10X5	17J
10	10X7.5	21J
12-20	10X10	25J
20-40	10X10	20J
40-50	10X10	15J

Mechanical properties of Bisplate450 steel plate:
Brinell hardness 425-475HBW
Yield strength: 1150 MPa
Tensile strength: 1400 Mpa
Elongation (50mm gauge length) 14%

Bisplate400 steel plate mechanical properties:
Bisplate400 suit strength: 1070 MPa
Bisplate400 tensile strength: 1320 Mpa
Bisplate400 elongation (50mm gauge) 16%
Bisplate400 steel plate -20℃ longitudinal Charpy impact value 65J
Bisplate400 steel plate -40℃ longitudinal Charpy impact value 50J
Bisplate400 Brinell hardness 370-430HBW