Steel for 440MPa-grade polar ship body and preparation method thereof

A hull and ferrite technology, applied in manufacturing tools, temperature control, heat treatment equipment, etc., can solve problems such as high strength, high toughness, good weldability, impact resistance, etc. at the same time, achieve excellent mechanical properties, and inhibit growth , good weldability

Active Publication Date: 2021-05-25
CENT IRON & STEEL RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the above analysis, the present invention aims to provide a 440MPa polar hull steel and its preparation method to solve the problem that the existing polar hull steel cannot simultaneously satisfy high strength, high toughness, good weldability and good impact resistance question

Method used

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  • Steel for 440MPa-grade polar ship body and preparation method thereof
  • Steel for 440MPa-grade polar ship body and preparation method thereof
  • Steel for 440MPa-grade polar ship body and preparation method thereof

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preparation example Construction

[0023] The invention provides a 440MPa polar hull steel suitable for polar environment and its preparation method. The marine steel has the characteristics of high strength, high and low temperature toughness and easy welding, etc., and is used to solve the problem that the existing steel plates cannot meet the use conditions of the polar environment temperature The problem.

[0024] The steel for the 440MPa polar ship hull provided by the invention has yield strength ≥ 440MPa, tensile strength ≥ 550MPa, elongation ≥ 26%, impact energy at -60°C ≥ 200J, section fiber % ≥ 90%.

[0025] Specifically, the microstructure of the steel is ferrite and pearlite, and the average ferrite grain size is ≤8 μm.

[0026] It should be noted that the ferrite content is not less than 75%. The strength of ferrite is lower, but its plasticity and toughness are better. The strength of pearlite is higher than that of ferrite, but its plasticity and toughness are lower than that of ferrite. Guaran...

Embodiment 1

[0050] This embodiment discloses six kinds (1#-6# steel) of 440MPa grade ship hull steel suitable for polar environment.

[0051] 1#-5# all adopt the same process: (1) after KR desulfurization; (2) converter smelting + LF refining; (3) continuous casting: target superheat of tundish molten steel ≤ 25 ℃, enter slow cooling pit after continuous casting (4) Controlled rolling and controlled cooling: the slab is heated at a low temperature, the heating temperature is between 1000-1050°C, the heating time is 180-240min, and the controlled rolling adopts a two-stage rolling method: the first stage is recrystallization Zone rolling, the rolling start temperature is 964-995°C, the cumulative deformation is 45%-50%, and the recrystallization of coarse austenite grains is promoted through deformation. The second stage is rolling in the non-recrystallized zone. The starting rolling temperature is 816-846°C, the cumulative deformation is 50%-52%, and the final rolling temperature is 785°C...

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Abstract

The invention relates to steel for a 440MPa-grade polar ship body and a preparation method thereof, belongs to the technical field of special steel for polar ships, and solves the problem that steel for the polar ship body in the prior art cannot achieve high strength, high toughness, good weldability and good impact resistance at the same time. The steel for the 440 MPa-grade polar ship body is characterized in that the steel comprises the following components in percentage by weight: 0.07-0.12% of C, 0.30-0.40% of Si, 1.30-1.60% of Mn, 0.25-0.40% of Cu, 1.0-1.5% of Ni, 0.06-0.10% of V, 0.008-0.012% of Ti, 0.05-0.07% of Als, less than or equal to 0.004% of N, less than or equal to 0.005% of P, less than or equal to 0.002% of S, and the balance Fe and inevitable impurity elements. The steel for the polar ship body achieves high strength, high toughness, good weldability and good impact resistance at the same time.

Description

technical field [0001] The invention relates to the technical field of special steel for polar ships, in particular to a 440MPa class polar ship hull steel and a preparation method thereof. Background technique [0002] With the gradual depletion of conventional recoverable oil and gas resources, the rich energy reserves in the Arctic region have received more and more attention. However, extremely harsh conditions put forward harsh technical requirements for polar ships. The International Maritime Organization and the International Association of Classification Societies have issued relevant guidelines and requirements as international conventions that ships sailing in polar waters must abide by. "Dragon" meets the requirements, but is far from being able to adapt to the tasks of polar activities, which severely restricts my country's participation in Arctic energy development and the development of trade through the Arctic. [0003] Polar ships have long faced the harsh se...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/08C22C38/12C22C38/14C22C38/16C21D6/00C21D8/02C21D9/00C22C33/06B21B37/74
CPCC22C38/02C22C38/04C22C38/16C22C38/08C22C38/12C22C38/14C22C38/06C22C38/001C22C38/002C22C33/06C21D6/001C21D6/005C21D6/008C21D8/0221C21D9/0081B21B37/74C21D2211/005C21D2211/009
Inventor 王天琪师仲然柴希阳柴锋罗小兵杨才福潘涛梁丰瑞陈雪慧
Owner CENT IRON & STEEL RES INST
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