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FH36 steel plate for economical icebreaker and preparation method thereof

An icebreaker, economical technology, applied in the direction of metal rolling, etc., can solve the problems of not providing brittle fracture resistance, strain aging performance, lack of brittle fracture resistance, strain aging performance, lack of FH36 steel plate production technology, etc., to improve Effect of strain aging performance, improvement of brittle fracture resistance, and reduction of crack probability

Active Publication Date: 2022-07-29
JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chinese patent document CN108517462 has obtained a high ductility EH40 grade ship plate steel. Although no precious alloys such as Cr, V, and Ni are added, its impact toughness is only at -40°C, and the amount of precious alloy Nb added is also relatively high. , between 0.03 and 0.04%
This method focuses on corrosion resistance and does not provide its anti-brittle fracture performance and strain aging performance. It has impact performance at -60°C, but it does not necessarily have -60°C brittle fracture resistance and -60°C strain aging performance, but it meets NDT performance. The strain aging performance must meet the conventional impact performance at the corresponding temperature
Without brittle fracture resistance and strain aging performance, it is not suitable for icebreakers. Therefore, this document lacks the production technology for directly producing FH36 steel plates for icebreakers
[0005] In addition to the aspect of composition design, the existing technology rarely involves in considering the low temperature strain timeliness and low temperature brittle fracture resistance required by icebreakers

Method used

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  • FH36 steel plate for economical icebreaker and preparation method thereof
  • FH36 steel plate for economical icebreaker and preparation method thereof
  • FH36 steel plate for economical icebreaker and preparation method thereof

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Embodiment Construction

[0030] The present invention will be further described in detail below with reference to the embodiments, which are exemplary and intended to explain the present invention, but should not be construed as limiting the present invention.

[0031] The chemical composition of the economical icebreaker FH36 steel plate corresponding to each embodiment is shown in Table 1. The data in the table is the mass percentage content of each element, and the remainder is Fe and inevitable impurity elements.

[0032] Table 1

[0033]

[0034]

[0035] The production process of the steel plate is as follows:

[0036] Smelting and continuous casting: select high-quality raw materials, use molten iron pretreatment, KR deep desulfurization, and the sulfur content is less than 0.0020%; converter tapping adopts premelting refining slag + active lime for slagging; converter end point C≤0.02%, the tapping process is carried out Argon and nitrogen are blown at the bottom for 15 to 20 minutes, t...

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Abstract

The invention relates to an economical FH36 steel plate for icebreakers and a preparation method thereof. The transverse tensile yield strength of the steel plate is between 464 and 480 MPa, the tensile strength is between 558 and 574 MPa, the yield strength ratio is between 0.83 and 0.84, and the elongation is greater than or equal to 26. %, -60°C low temperature longitudinal impact toughness value ≥200J; steel plate samples were subjected to 5% plastic deformation, aged at 250°C for 1 hour, and the impact toughness value aged at -60°C did not decrease significantly; drop weight test NDT according to ASTM E208, -60 ℃ test qualified, with excellent low temperature brittle fracture resistance, ductile-brittle transition temperature T NDT <‑60℃; microstructure is proeutectoid ferrite, acicular ferrite and a small amount of pearlite.

Description

technical field [0001] The invention belongs to the field of iron and steel metallurgy, and in particular relates to an FH36 steel plate for icebreakers and a preparation method thereof. Background technique [0002] Onshore oil and gas resources are increasingly depleted, while the Arctic region is rich in resource reserves, which have great strategic significance and research potential. At the same time, the new Arctic waterway greatly shortens the navigation route and reduces the fuel consumption, thereby saving the navigation cost. Therefore, the construction of icebreakers is increasing day by day. Icebreakers break ice mainly through impact force and gravity. These two methods have extremely strict requirements on the performance and quality of ship plate steel, and because of their service in extremely cold regions, in addition to high strength, they also need to have excellent low temperature toughness, corrosion resistance, and laminar tear resistance. , In parti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/12C22C38/14C21D6/00C21D8/02C22C33/04B21B1/26
CPCC22C38/02C22C38/04C22C38/12C22C38/14C22C38/06C22C38/002C22C33/04C21D8/0221C21D8/0205C21D6/005C21D6/008B21B1/26C21D2211/005C21D2211/009
Inventor 刘朝霞罗元东白云陈翀周永浩戚晓光徐光琴韩步强
Owner JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO LTD
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