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A kind of production method of anti-crack steel for container ship

A technology for container ships and production methods, applied in workpiece cooling devices, manufacturing tools, metal rolling, etc., can solve the problems of temperature fluctuations in the rolling process, rolling waste in the rolling head, low yield at one time, etc. The effect of large reduction, reduction of rolling passes, and increase of effective compression ratio

Active Publication Date: 2020-05-22
NANJING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Due to the particularity of the process, multi-stage low-temperature rolling is required for the production process of crack arrest steel with a thickness of 70-80mm, and the intermediate billet needs to be watered multiple times. Plate rolling mills are very prone to rolling warping and mid-waste, and temperature fluctuations in the rolling process lead to unsuitable performance, resulting in a very low primary yield

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  • A kind of production method of anti-crack steel for container ship

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Effect test

Embodiment 1

[0024] Embodiment 1 is to produce order crack arrest steel with a thickness of 70mm and a width of 2060mm. Before production, a detailed production plan must be formulated, preparations for production should be made, and production should be optimized according to the following steps after confirming the production conditions:

[0025] 1. Material type design: choose the thickness of the thickest continuous casting billet section 320mm, according to the principle of reducing rolling passes, select the billet design of the full longitudinal rolling method, the product target width design is 2130mm, and the billet size is 320*2130*L. The billet design can be directly cross-rolled, reducing the number of forming passes and increasing the effective pass reduction.

[0026] 2. Billet heating: Due to the full longitudinal rolling of the billet, the heating temperature limit of the slab is 1145-1155°C. In order to ensure the uniformity of the thickness direction of the steel plate, th...

Embodiment 2

[0031] Embodiment 2 is to produce order crack arrest steel with a thickness of 80mm and a width of 2880mm. Before production, a detailed production plan must be formulated, preparations for production should be made, and production should be optimized according to the following steps after confirming the production conditions:

[0032] 1. Material type design: choose the thickness of the thickest continuous casting billet section 320mm, according to the principle of reducing rolling passes, choose the billet design of the full cross rolling method, the product target width design is 2955mm, and the billet size is 320*2955*L. Billet design, in order to directly transfer steel to cross rolling in the rolling process, reduce forming passes and increase effective pass reduction.

[0033] 2. Billet heating: Due to the full cross-rolling of the billet, the upper limit of the slab heating temperature is 1150-1160°C. In order to ensure the uniformity of the thickness direction of the s...

Embodiment 3

[0038] Embodiment 3 is to produce order crack arrest steel with a thickness of 75mm and a width of 3250mm. Before production, a detailed production plan must be formulated, preparations for production should be done, and production should be optimized according to the following steps after confirming the production conditions:

[0039] 1. Material type design: choose the thickness of the thickest continuous casting slab section 320mm, according to the principle of reducing the rolling pass, choose the blank design of the full cross rolling method, the product target width design is 3475mm, and the blank size is 320*3475*L. For billet design, only vertical and horizontal rolling can be selected.

[0040] 2. Billet heating: due to the full cross-rolling of the billet, the lower limit of the slab heating temperature is 1140-1150°C. In order to ensure the uniformity of the thickness direction of the steel plate, the heating time of the heating furnace is controlled at 320-370min, a...

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Abstract

The invention discloses a method for producing crack arresting steel for container ships. By selecting billets with different sections according to different widths of finished products and rolling them, the number of rolling passes is reduced and the reduction in passes is increased. Due to the characteristics of slow production rhythm, use the space left in the heating furnace to reduce the time in the furnace to ensure the execution of the heating process and ensure the surface quality; the heating process ensures the uniformity of the thickness direction of the slab; the rolling process adopts full longitudinal rolling or full transverse rolling as much as possible The rolling method increases the effective compression ratio; in order to refine the grain, the intermediate billet is cooled ultra-fast, and different cooling processes are set according to the specifications and the cooling process of the finished steel plate is determined. In this way, an accurate and effective stable production process for the production of crack arrest steel is realized, so that the stability of the production process of crack arrest steel meets the requirements of batch industrial production and various indicators such as mechanical properties and product quality stability meet the standard requirements, and the production process is easy to control.

Description

technical field [0001] The invention relates to a production method of steel, in particular to a production method of anti-crack steel for container ships. Background technique [0002] In recent years, with the needs of economic development, the volume of trade has increased. In order to improve the efficiency of ocean transportation, the volume of maritime material transportation has continued to increase. Container ships have developed in the direction of large, efficient, safe, and environmentally friendly. Higher requirements. Because the mouth coamings and decks of large container ships are subject to complex alternating stresses such as heavy loads and impacts, in order to ensure the safety of the ship structure and prevent brittle fractures, it is necessary to use high-strength, large-thickness, and high-toughness container crack arrest steel to meet the requirements. Requirements. [0003] Due to the particularity of the process, multi-stage low-temperature rollin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21B1/02B21B45/02B21B37/74
CPCB21B1/026B21B45/0203B21B37/74
Inventor 陈富强张淼车超黄龙邓飞翔樊卫
Owner NANJING IRON & STEEL CO LTD
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