DH32 is a high strength ship plate. There are two types of hull structural steel: ordinary thickness steel and high strength steel. General strength steel is divided into four grades according to quality: A, B, C and D; High strength steel is divided into two strength grades and three quality grades; AH32、DH32、EH32、AH36、DH36、EH36。
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General strength structural steel specified by China Classification Society is divided into four quality grades: A, B, D and E (namely CCSA, CCSB, CCSC and CCSD);
The high-strength structural steel of China Classification Society has three strength grades and four quality grades.
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Chemical composition of DH32:
Carbon (C)≤0. 18
Manganese 0.90 ~ 1.60
Aluminum (Al)≥0.0 15
Silicon (Si) 0. 10 ~ 0.50
Phosphorus (P)≤0.04
Sulfur content ≤0.04
Yield strength σs (MPa)3 15
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Structural steel for hull is divided into general strength structural steel and high strength structural steel according to the small yield point. Ship plate refers to the hot-rolled steel plate produced in accordance with the requirements of the construction code of classification society for the manufacture of hull structures. General strength structural steel specified by China Classification Society is divided into four quality grades: A, B, D and E (namely CCSA, CCSB, CCSD and CCSE); The high-strength structural steel of China Classification Society has three strength grades and four quality grades.
The main classification society specifications are:
China CCS
American ABS
Germany GL
France BV
Norwegian DNV
Japan NK
British LR
Korea KR
RINA Italy
Structural steel for hull is divided into general strength structural steel and high strength structural steel according to the small yield point.
General strength structural steel of China Classification Society is divided into four quality grades: A, B, D and E; The high-strength structural steel of China Classification Society has three strength grades and four quality grades:
A32
A36
A40
D32
D36
D40
E32
E36
E40
F32
F36
F40
A32 D32 E32 F32 ≤50mm carbon equivalent ceq, and% is not more than 0.36.
& gt50- 100 carbon equivalent Ceq,% is not more than 0.4.
A36 D36 E36 F36 ≤50mm carbon equivalent CEQ, and% is not more than 0.38.
& gt50- 100 carbon equivalent Ceq,% is not more than 0.4.
A40 D40 E40 F40≤50mm carbon equivalent ceq, and% is not more than 0.4.
& gt50- 100 carbon equivalent Ceq,% none.
The calculation formula of carbon equivalent is c eq (%) = c+Mn/6+(Cr+Mo+V)/5+(Ni+Cu)/15.
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I. Steel for hull structure with general strength
Hull structures are classified into Grade A, Grade B, Grade D and E4 with ordinary strength steel. The yield strength (not less than 235 N/mm 2) of these four steels is the same as the tensile strength (400 ~ 520 N/mm 2), but the impact work at different temperatures is different.
High-strength steel for hull structure is divided into strength grades according to its yield strength, and each strength grade is divided into A, D, E and F4 grades according to its impact toughness.
The yield strength of A32, D32, E32 and F32 is not less than 3 15N/mm 2, and the tensile strength is 440 ~ 570N/mm 2. A, D, E and F respectively indicate that they can be reached at 0, -20, -40 and -60 respectively.
The yield strength of A36, D36, E36 and F36 is not less than 355 N/mm 2, and the tensile strength is 490 ~ 620 N/mm 2. A, D, E and F represent their impact toughness at 0, -20, -40 and -60 respectively.
The yield strength of A40, D40, E40 and F40 is not less than 390 N/mm 2, and the tensile strength is 5 10 ~ 660 N/mm 2. A, D, E and F respectively indicate that they can be used at 0, -20, -40 and -60 respectively.
Also,
High strength quenched and tempered steels for welded structures: A420, D420, E420, F420；; A460、D460、E460、F460A500、D500、E500、F500A550、D550、E550、F550A620、D620、E620、F620A690、D690、E690、F690
Steel for boilers and pressure vessels: 360A, 360B；; 4 10A、4 10B； 460A、460B490A、490B 1Cr0.5Mo、2.25Cr 1Mo
Steel for mechanical structure: generally, the above steel can be selected;
Low temperature toughness steel: 0.5NiA, 0.5NiB, 1.5Ni, 3.5Ni, 5Ni, 9Ni；;
Austenitic stainless steel: 00cr18ni10,00cr10n, 00cr17ni14mo2,00cr17ni/.
Duplex stainless steel: 00Cr22Ni5Mo3N, 00Cr25Ni6Mo3Cu, 00Cr25Ni7Mo4N3.
Composite steel plate: suitable for containers and cargo holds of chemical carriers;
Z-direction steel: based on a certain grade of structural steel (called mother grade steel), it has undergone special treatment (such as calcium treatment, vacuum degassing, argon stirring, etc.). ) and carry out appropriate heat treatment.