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Crack arrest steel plate for BCA2-grade container ship and manufacturing method of crack arrest steel plate

A technology for container ships and manufacturing methods, applied in the directions of manufacturing tools, metal rolling, furnace types, etc., can solve the problems of lack of general production conditions, low rolling efficiency, and rising comprehensive costs, and achieve increased crack initiation energy and quantity. The effect of reduction and fewer restrictions on production conditions

Active Publication Date: 2021-03-16
NANJING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The total compression ratio of the steel plate is required to be ≥ 3.5, which does not meet the general production conditions; the production process is complicated, and the rolling efficiency is low, which on the contrary brings the disadvantages of rising comprehensive costs

Method used

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  • Crack arrest steel plate for BCA2-grade container ship and manufacturing method of crack arrest steel plate
  • Crack arrest steel plate for BCA2-grade container ship and manufacturing method of crack arrest steel plate
  • Crack arrest steel plate for BCA2-grade container ship and manufacturing method of crack arrest steel plate

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Embodiment Construction

[0032] The embodiment provides a BCA2 grade crack arresting steel plate for container ships, its composition is shown in Table 1, Table 2 to Table 4 are the manufacturing process of the steel plate in the example, and Table 5 is the performance parameters of the steel plate in the example.

[0033] Table 1 Chemical composition unit: w.t.%

[0034] serial number Plate thickness / mm C Si mn P S Cr Ni Cu Nb Ti Alt Example 1 80 0.04 0.40 1.70 0.009 0.003 0.01 0.35 0.30 0.012 0.012 0.020 Example 2 90 0.09 0.10 1.85 0.004 0.002 0.10 0.50 0.20 0.030 0.005 0.030 Example 3 100 0.07 0.25 2.00 0.006 0.001 0.22 0.58 0.10 0.045 0.020 0.050

[0035] Table 2

[0036] serial number Plate thickness / mm Heating temperature / ℃ Cumulative strain ε 1

Grain size d / μm Example 1 80 1180 0.74 26.52 Example 2 90 1100 0.27 33.67 Example 3 100 1080 0.41 25.45

[0037] ta...

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Abstract

The invention discloses a crack arrest steel plate for a BCA2-grade container ship, and relates to the technical field of steel production. The crack arrest steel plate comprises, by mass, 0.04%-0.10%of C, 1.60%-2.00% of Mn, 0.30%-0.60% of Ni, 0.005%-0.05% of Nb, 0.005%-0.02% of Ti, 0.015%-0.060% of Al, 0.01%-0.25% of Cr, 0.10%-0.35% of Cu, 0.10%-0.40% of Si, less than or equal to 0.010% of P, less than or equal to 0.004% of S, and the balance Fe and other unavoidable impurities. Ferrite is induced to be separated out through grain boundary deformation, generation of carbide at the grain boundary is restrained, the crack initiation probability is reduced, and the crack initiation energy is increased; and coarse carbide particles among bainite strip bundles are refined, the quantity of coarse carbide is reduced, the length of a crack propagation path is increased, the brittle crack propagation resistance is effectively increased, and thus the crack arrest toughness is remarkably improved.

Description

technical field [0001] The invention relates to the technical field of iron and steel production, in particular to a crack arresting steel plate for BCA2 container ships and a manufacturing method thereof. Background technique [0002] The International Association of Classification Societies stipulates in UR W31 that when the thickness of the crack arrest steel plate for container ships exceeds 80mm, its crack arrest toughness should meet BCA2 level, that is, the crack arrest toughness Kca≥8000N / mm at -10°C 1.5 , and will take effect on January 1, 2021. [0003] For the steel plate above 80mm, due to the relatively small compression ratio and the slow controlled cooling rate, the conventional TMCP process has been difficult to improve the crack arrest performance of the steel plate. [0004] Existing studies have shown that there are many factors affecting the crack arrest performance of steel plates. The grain size, the volume fraction of each phase, the number of pearlit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/06C22C38/42C22C38/48C22C38/50C22C38/58C21D6/00C21D8/02C21D9/00B21B1/22
CPCC22C38/02C22C38/58C22C38/48C22C38/50C22C38/06C22C38/42C22C38/002C21D6/004C21D6/005C21D6/008C21D8/0221C21D9/0081B21B1/22B21B2001/225
Inventor 邱保文赵晋斌车马俊李恒坤张晓雪伯飞虎张淼邓阳
Owner NANJING IRON & STEEL CO LTD
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