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A kind of anti-crack steel plate for BCA2 container ship and its manufacturing method

A container ship and manufacturing method technology, applied in the direction of manufacturing tools, metal rolling, furnaces, etc., can solve the problems of not having common production conditions, low rolling efficiency, and rising comprehensive costs, so as to increase crack initiation energy and improve quenching Permeability, the effect of less restrictions on production conditions

Active Publication Date: 2022-03-01
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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  • A kind of anti-crack steel plate for BCA2 container ship and its manufacturing method
  • A kind of anti-crack steel plate for BCA2 container ship and its manufacturing method
  • A kind of anti-crack steel plate for BCA2 container ship and its manufacturing method

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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 arresting steel plate for BCA2 container ships, which relates to the technical field of iron and steel production. Its chemical composition and mass percentage are as follows: C: 0.04%-0.10%, Mn: 1.60%-2.00%, Ni: 0.30%-0.60 %, Nb: 0.005%~0.05%, Ti: 0.005%~0.02%, Al: 0.015%~0.060%, Cr: 0.01%~0.25%, Cu: 0.10%~0.35%, Si: 0.10%~0.40%, P≤0.010%, S≤0.004%, the balance is Fe and other unavoidable impurities. Deformation induces ferrite precipitation at grain boundaries, curbs the generation of carbides at grain boundaries, reduces the probability of crack initiation, and increases crack initiation energy; refines coarse carbide particles between bainite strands, reduces the number of coarse carbides, and increases cracks Extending the path length effectively increases the resistance to brittle crack propagation, thereby significantly improving the crack arrest toughness.

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 Patents(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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