Steel plate for acicular ferrite/blocky ferrite ship and manufacturing method of steel plate

A technology of acicular ferrite and bulk ferrite, applied in the field of iron and steel metallurgy, can solve the problems of high alloy cost, not in line with the development trend of cost reduction and efficiency increase of ship plate steel, and many alloy additions, etc. Nucleation point, inhibition of pearlite formation, effect of reducing internal stress

Active Publication Date: 2022-03-04
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 alloy

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  • Steel plate for acicular ferrite/blocky ferrite ship and manufacturing method of steel plate
  • Steel plate for acicular ferrite/blocky ferrite ship and manufacturing method of steel plate
  • Steel plate for acicular ferrite/blocky ferrite ship and manufacturing method of steel plate

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Embodiment Construction

[0034] The present invention will be further described in detail below in conjunction with the examples. The examples are exemplary and intended to explain the present invention, but should not be construed as limiting the present invention.

[0035] The chemical composition of the acicular ferrite / massive ferrite marine steel plate corresponding to each embodiment is shown in Table 1. The data in the table are the mass percentage content of each element, and the rest are Fe and unavoidable impurity elements.

[0036] Table 1

[0037] Example furnace 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 ...

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Abstract

The invention relates to an acicular ferrite/blocky ferrite marine steel plate and a manufacturing method thereof, the microstructure is acicular ferrite and blocky ferrite, the acicular ferrite accounts for 40 +/-5% by volume, and the average grain size of the ferrite is 3-6 [mu] m. The transverse tensile property of the yield strength ranges from 390 MPa to 420 MPa, the tensile strength ranges from 520 MPa to 550 MPa, the yield ratio ranges from 0.72 to 0.77, the ductility is larger than or equal to 29%, the longitudinal impact toughness values at the temperature of-40 DEG C and-60 DEG C are larger than or equal to 200 J, and after strain aging, the impact toughness values at the temperature of-40 DEG C and-60 DEG C are not obviously reduced. The low carbon content is adopted, and Si-Cr-Nb elements are added, so that ferrite phases are formed as many as possible, and formation of pearlite is inhibited. The high final cooling temperature is adopted, it is guaranteed that the matrix structure of the steel plate is still ferrite/acicular ferrite through the high final cooling temperature, and the situation that the toughness and the plastic structure of the steel plate are deteriorated although the strength can be improved through upper bainite or granular bainite is avoided.

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 in countries all over the world, the marine shipbuilding industry and equipment industry have achieved considerable development, which has driven the technological progress of steel plates for ships and marine engineering. The size of steel plates used in modern ships and marine engineering is developing towards greater thickness, and they need to have the characteristics of high strength, high toughness, easy welding, easy processing, and corrosion resistance. [0003] At present, the most orders are AH36, DH36, EH36 and other high-strength hull s...

Claims

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Application Information

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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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