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Production method of crack arresting steel for container ship

A technology for container ships and production methods, applied in workpiece cooling devices, workpiece surface treatment equipment, metal rolling, etc., capable of solving problems such as temperature fluctuations in the rolling process, rolling warping and mid-waste, low primary yield, etc. To achieve the effect of increasing the pass reduction, reducing the rolling pass and increasing the effective compression ratio

Active Publication Date: 2019-08-02
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

Method used

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  • Production method of crack arresting 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*2600*2955. 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 th...

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 billet section 320mm, according to the principle of reducing the rolling pass, select the billet design of the full cross rolling method, the product target width design is 3475mm, and the billet size is 320*2770*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 320-370mi...

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Abstract

The invention discloses a production method of crack arresting steel for a container ship. Billets having different cross sections are selected for rolling according to different finished product widths, the rolling pass is reduced, and the reduction in pass is increased; as for planning arrangement, according to the characteristics that the rolling mode is special and the rolling frequency is slow, the time in a furnace is shortened through blank positions in a heating furnace, execution of a heating technology is ensured, and the surface quality is ensured; the heating process ensures the uniformity of a plate slab in the thickness direction; a rolling technology uses a full longitudinal rolling or full horizontal rolling manner as many as possible, and the effective compression ratio isincreased; and in order to refine grains, the intermediate billet is subjected to ultra-fast cooling, different cooling technologies are set according to specifications, and a finished steel sheet cooling technology is determined. A stable production technology for accurately and effectively producing the crack arresting steel can be realized, the stability of the production technology of the crack arresting steel meets the batch industrial production, the mechanical properties, the product quality stability and various indexes meet the standard requirement, and the production process is easyto 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 Applications(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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