Accreditation Administration System:
KR Grade AH40,KR Grade DH40,KR Grade EH40,KR Grade FH40 Shipbuilding steel plate are
using in the higher strength enviornment underwater.There shall be the following steel marks
on the plates:
① Steel Grade and KR Logo.
② Mill’s name or Mill’s Logo.
③ Specifications
④ Heat Number. and Bath Number.
Mill Test Certificate should indicate the chemical and tensile values,and follow the KR rule.
Property Data:
|
Grade |
|
KR Grade AH40 |
KR Grade DH40 |
KR Grade EH40 |
KR Grade FH40 |
|
Chemical Composition % ≤ |
C |
0.18 |
0.18 |
0.18 |
0.16 |
|
Mn |
0.90-1.60 |
0.90-1.60 |
0.90-1.60 |
0.90-1.60 | |
|
Si |
0.10-0.50 |
0.10-0.50 |
0.10-0.50 |
0.10-0.50 | |
|
P |
0.035 |
0.035 |
0.035 |
0.025 | |
|
S |
0.035 |
0.035 |
0.035 |
0.025 | |
|
Al (acid) |
0.015 |
0.015 |
0.015 |
0.015 | |
|
Nb |
0.02-0.05 |
0.02-0.05 |
0.02-0.05 |
0.02-0.05 | |
|
V |
0.05-0.10 |
0.05-0.10 |
0.05-0.10 |
0.05-0.10 | |
|
Ti |
0.02 |
0.02 |
0.02 |
0.02 | |
|
Cu |
0.35 |
0.35 |
0.35 |
0.35 | |
|
Cr |
0.20 |
0.20 |
0.20 |
0.20 | |
|
Ni |
0.40 |
0.40 |
0.40 |
0.80 | |
|
Mo |
0.08 |
0.08 |
0.08 |
0.08 | |
|
N |
|
|
|
0.009 | |
|
Tensile Strength (Mpa) ≥ |
510-650 |
510-650 |
510-650 |
510-650 | |
|
Yield Strength (Mpa) ≥ |
390 |
390 |
390 |
390 | |
|
Mark on steel plate |
KR/AH40 |
KR/DH40 |
KR/EH40 |
KR/FH40 | |
