Acicular ferrite/bulk ferrite marine steel plate and manufacturing method thereof

A technology of acicular ferrite and massive ferrite, applied in the field of iron and steel metallurgy, can solve the problems of high alloy cost, not conforming to the development trend of ship plate steel to reduce cost and increase efficiency, and add more alloys, etc. Nucleation point, inhibiting the formation of pearlite, reducing the effect of internal stress

Active Publication Date: 2022-07-22
JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The patent document CN106756543 relates to a high-strength ship plate steel for low-cost high-energy-input welding in TMCP state. There are many alloys added, and the cost of the alloy is too high, which does not meet the development trend of ship plate steel to reduce costs and increase efficiency.

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  • Acicular ferrite/bulk ferrite marine steel plate and manufacturing method thereof
  • Acicular ferrite/bulk ferrite marine steel plate and manufacturing method thereof
  • Acicular ferrite/bulk ferrite marine steel plate and manufacturing method thereof

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Embodiment Construction

[0034] 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.

[0035] The chemical compositions of the acicular ferrite / mass ferrite marine steel sheets corresponding to each embodiment are shown in Table 1. The data in the table are the mass percentage contents of each element, and the remainder are Fe and inevitable impurity elements.

[0036] Table 1

[0037] Example Heat number C Si Mn P S Cr Ca Al Ti N Nb Example 1 S22007231 0.03 0.36 1.58 0.004 0.0014 0.10 0.0010 0.014 0.016 0.0035 0.047 Example 2 S22004775 0.04 0.48 1.46 0.003 0.0007 0.18 0.0012 0.008 0.012 0.0045 0.050 Example 3 S11904874 0.05 0.40 1.53 0.005 0.0013 0.22 0.0020 0.018 0.015 0.0050 0.048 Example 4 S11904883 0.04 0.45 1.56 0.003 0.0016 0.15 0.0...

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Abstract

The invention relates to an acicular ferrite / block ferrite marine steel sheet and a manufacturing method thereof. The microstructure is acicular ferrite+block ferrite, wherein the volume ratio of acicular ferrite is 40%. ±5%, the average grain size of ferrite is 3‑6 μm. Yield strength Transverse tensile properties range from 390 to 420MPa, tensile strength ranges from 520 to 550MPa, yield strength ratio ranges from 0.72 to 0.77, elongation ≥29%, ‑40℃, ‑60℃ longitudinal impact toughness values ​​≥200J, After strain aging, the impact toughness values ​​at ‑40℃ and ‑60℃ did not decrease significantly. With a lower carbon content, and through the addition of Si-Cr-Nb elements, as many ferrite phases are formed as possible, and the formation of pearlite is suppressed. A higher final cooling temperature is adopted, which ensures that the matrix structure of the steel plate is still ferrite / acicular ferrite, and avoids upper bainite or granular bainite. Although these can improve the strength, they will deteriorate the steel plate. Toughness and plasticity appear.

Description

technical field [0001] The invention belongs to the field of iron and steel metallurgy, and in particular relates to an acicular ferrite / block ferrite marine steel plate and a preparation method thereof. The thickness of the steel plate is between 50-70mm, and it has good low temperature impact toughness and strain aging performance. Background technique [0002] With the continuous development and utilization of marine resources by countries all over the world, the marine shipbuilding industry and the equipment industry have developed by leaps and bounds, which has driven the technological progress of steel plates for ships and marine engineering. The size of steel plates for modern ships and offshore engineering is developing to larger thickness, and it needs to have the characteristics of high strength, high toughness, easy welding, easy processing, and corrosion resistance. [0003] At present, the largest order quantity is AH36, DH36, EH36 and other high-strength hull ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/38C22C38/28C22C38/26C22C38/06C22C33/06C21D8/02C21D11/00
CPCC22C38/02C22C38/04C22C38/38C22C38/28C22C38/26C22C38/06C22C38/001C22C38/002C22C33/06C21D8/0205C21D8/0226C21D8/0247C21D11/005C21D2211/005
Inventor 刘朝霞罗元东许晓红刘俊周永浩戚晓光潘继峰徐光琴高俊陈翀
Owner JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO LTD
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