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A control method for implementing NAC process of marine plate by using quenching machine device

A control method and marine board technology, applied in the field of heat treatment, can solve problems such as connection, limited use of quenching machines, difficulty in ensuring temperature compliance, etc., and achieve the effects of strong pertinence, easy realization, and performance requirements

Active Publication Date: 2016-08-24
NANJING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, the Chinese patent "A quenching process for ultra-high-strength marine steel E690 extra-thick steel plates" (application number: 201310291750.4, application date: 2013-07-12) discloses a method of controlling the water volume and roll speed of several groups of nozzles to A technical solution to control the quenching process, but this technical solution has very limited use of the entire quenching machine, and the entire process is not well connected with the heat treatment process, so it is difficult to ensure that the temperature reaches the standard in actual production

Method used

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  • A control method for implementing NAC process of marine plate by using quenching machine device
  • A control method for implementing NAC process of marine plate by using quenching machine device
  • A control method for implementing NAC process of marine plate by using quenching machine device

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Effect test

Embodiment 1

[0025] The steel type is 20mm D36N; the shape of the incoming material is 5mm / m; the total heating time is 30min, and the soaking time is 20min; the soaking temperature is 890°C, the furnace temperature is 887°C, and the cooling temperature is 877°C; The cooling water temperature is controlled at 25°C. The opening mode of the quenching machine: the aerosol section is closed; the water volume at the high pressure end is 200m 3 / h, the water ratio is set to 1.20; the low pressure end is 120 m 3 / h; the water ratio is set to 1.20; the measurement time of the redness temperature point is 10s after exiting the quenching machine, the redness temperature is 630°C, and the cooling rate is 4.0°C / s.

Embodiment 2

[0027] The steel type is 45mm D36N; the incoming plate shape is 4mm / m; the total heating time is 65min, and the soaking time is 30min; the soaking temperature is 891°C, the furnace temperature is 889°C, and the cooling temperature is 882°C; The cooling water temperature is controlled at 25°C. The opening mode of the quenching machine: the aerosol section is closed; the water volume at the high pressure end is 260m 3 / h, the water ratio is set to 1.30; the low pressure end is 150 m 3 / h; the water ratio is set to 1.30; the measurement time of the redness temperature point is 12s after exiting the quenching machine, the redness temperature is 635°C, and the cooling rate is 5.2°C / s.

Embodiment 3

[0029] The steel type is 60mm E36N; the shape of the incoming material is 3mm / m; the total heating time is 125min, and the soaking time is 40min; the soaking temperature is 908°C, the furnace temperature is 906°C, and the cooling temperature is 902°C; The cooling water temperature is controlled at 25°C. The opening mode of the quenching machine: the aerosol section is closed; the water volume at the high pressure end is 350m 3 / h, the water ratio is set to 1.40; the low pressure end is 180 m 3 / h; the water ratio is set to 1.40; the measurement time of the temperature point of turning red is 18s after exiting the quenching machine, the temperature of turning red is 660°C, and the cooling rate is 6.5°C / s.

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Abstract

The present invention is a kind of control method that utilizes the quenching machine device to implement the NAC process of marine panels, and is carried out according to the following procedures: 1. The thickness of the plate is 20-100mm; the shape of the plate in the furnace is ≤ 8mm / m; H‑2H min, H steel plate thickness, min time unit; soaking time ≥ 20min, soaking temperature T1 890-910°C; relationship between T2 and T1 is T2‑T1=±5°C; 2. Turn off the quenching machine gas Fog device, roller speed 0.30-0.80m / s, cooling water temperature 25°C; the relationship between the open-cooling temperature T3 and T2 of the marine board is 0°C≤T2-T3≤10°C; the water volume at the high-pressure end is 200-500m³ / h, The upper and lower water ratios are 1.20-1.50; the low-pressure end is 120-200 m³ / h, the upper and lower water ratios are 1.20-1.50; 3. 10-25s out of the quenching machine to measure the red temperature, the red temperature is 630-680°C, cooling rate: 4- 10°C / s; this method proposes specific control means from the whole process of heat treatment to ensure that the temperature reaches the standard.

Description

technical field [0001] The invention relates to a heat treatment method, in particular to a control method for implementing a NAC process of a marine plate by using a quenching machine device, and belongs to the technical field of steel plate normalizing and cooling control. Background technique [0002] NAC process, also called NCC process, its technical feature is normalizing + accelerated cooling. Generally, normalizing steel types are completed by air cooling, but for some steel types with special requirements, in order to make the performance meet the standard, it is necessary to give special treatment to the steel type. A larger cooling rate is used to complete the purpose, so that a certain strength margin can be obtained to prevent the problems caused by the reduction of subsequent aging strength; such a process is not only different from the online TMCP process, but also has the essence of the traditional quenching and tempering process Its advantage is that it can ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D11/00C21D1/18C21D9/46
Inventor 王从道李东晖赵荣贵檀传淼
Owner NANJING IRON & STEEL CO LTD
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