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Economical low-temperature toughness E-grade high-strength marine steel plate and manufacturing method thereof

A low-temperature toughness, marine steel plate technology, used in manufacturing tools, temperature control, metal rolling, etc., can solve the problem of high cost of marine high-strength steel plates, achieve high control of morphology and grain size, and good uniformity of structure and properties , to achieve the effect of tissue strengthening

Active Publication Date: 2021-07-27
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, microalloying is basically used in China to design the chemical composition of steel plates, and AH32, DH32, EH32, AH36, DH36, and EH36 ship plates with Nb, V, and Ti are added on the basis of the composition of C / Mn steel. The cost of high-strength steel plates for ships has been high due to the addition of

Method used

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  • Economical low-temperature toughness E-grade high-strength marine steel plate and manufacturing method thereof
  • Economical low-temperature toughness E-grade high-strength marine steel plate and manufacturing method thereof
  • Economical low-temperature toughness E-grade high-strength marine steel plate and manufacturing method thereof

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Embodiment Construction

[0032] Specific embodiments are described below in conjunction with accompanying drawing:

[0033] From the metallographic structure of Example 1, it can be seen that the structure of the steel plate after TMCP treatment is basically ferrite + pearlite + a small amount of bainite structure, the original austenite structure of the steel plate and the structure of the finished steel plate have clear grain boundaries, and the grain Very fine (with austenite grain size of 9.0 and ferrite grain size of 10.0), which greatly improves the low-temperature impact toughness and high strength level of economical low-temperature marine steel.

[0034] Table 1 shows the chemical composition of the economical low-temperature toughness grade E high-strength marine steel plate of the present invention;

[0035] Table 1 steel chemical composition of the embodiment of the present invention

[0036]

[0037] Table 2 steel rolling method of the embodiment of the present invention

[0038] ...

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Abstract

The invention discloses an economical low-temperature toughness E-grade high-strength marine steel plate and a manufacturing method of the steel plate. The steel plate comprises the following chemical elements in percentage by mass: C: 0.11%-0.16%; Si: 0.05%-0.14%; Mn: 1.45%-1.65%; S: smaller than or equal to 0.002%; P: smaller than or equal to 0.008%; Als: 0.02%-0.04%; N: 0.003%-0.015%; Nb: 0.01%-0.03%; Ti: 0.008%-0.014%; and the balance of Fe and inevitable impurities. The technical requirements of the marine steel plate in severe and harsh ocean environments can be met.

Description

technical field [0001] The invention belongs to the field of steel material preparation, and in particular relates to an economical low-temperature toughness E-grade high-strength marine steel plate and a manufacturing method thereof. Background technique [0002] High-strength AH32, DH32, EH32, AH36, DH36, EH36 marine steel plates are one of the main materials required for ship construction, with large output and wide application. At present, microalloying is basically used in China to design the chemical composition of steel plates, and AH32, DH32, EH32, AH36, DH36, and EH36 ship plates with Nb, V, and Ti are added on the basis of the composition of C / Mn steel. The cost of high-strength steel plates for ships has been high due to the addition of high-strength steel plates. Contents of the invention [0003] In order to overcome the above-mentioned defects, the technical problem to be solved in the present invention proposes an economical low-temperature toughness E-grad...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/12C22C38/14C22C33/04C21D8/02B21B37/74B21B45/00
CPCC22C38/02C22C38/04C22C38/06C22C38/001C22C38/12C22C38/14C22C33/04C21D8/0205C21D8/0226B21B37/74B21B45/004C21D2211/005C21D2211/009
Inventor 张鹏严玲王华韩鹏王东旭陈华李广龙王晓航李文斌齐祥羽
Owner ANGANG STEEL CO LTD
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