Soft measurement method for size of austenite grains in heating process of steel billet

A technology for heating austenite grains and steel slabs, applied in heat treatment process control, heat treatment furnaces, heat treatment equipment, etc., can solve the problems of not being able to know the dynamic changes of austenite grains, affecting product performance, and energy waste, etc., to achieve Accurate control, improve heating quality, and reduce energy waste

Inactive Publication Date: 2018-11-13
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is used to solve the problem that the dynamic change of austenite grains in the steel billet during the high temperature process cannot be known by the existing technology, which causes energy waste, and makes the structure inside the billet coarse, which affects the performance of the product

Method used

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  • Soft measurement method for size of austenite grains in heating process of steel billet
  • Soft measurement method for size of austenite grains in heating process of steel billet
  • Soft measurement method for size of austenite grains in heating process of steel billet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067] Example 1 (slab and billet)

[0068] The low-carbon steel slab enters the heating furnace for heating, and after the heating is completed, it is rolled out of the furnace. The chemical composition of the steel slab is:

[0069] element name

C

Si

mn

Nb

Ni

content

0.058

0.43

1.68

0.051

0.17

[0070] Firstly, according to step 1 and step 2, the parameter information of the billet is obtained, and the temperature distribution and grain size distribution of the billet are set. The thickness of the billet is 200mm, the width is 300mm, and the length is 10m. For the first calculation, the temperature distribution of the slab is set to the actual measured surface temperature at the time of furnace charging i=1,2,3,4,5; j=1,2,3,4,5; the initial grain size distribution of the billet is set as k=1, 2, 3 represent head, middle and tail respectively.

[0071] The heating process is as follows, the upper part of the heating...

Embodiment 2

[0081] Embodiment 2 (round billet)

[0082] In this embodiment, the round billet has a diameter of 300 mm, low carbon steel, and the composition is the same as in Embodiment 1. meshing as image 3 , the radial direction is divided into 7, and the angular direction is divided into 9. The initial temperature and grain size of the round billet are the same as in Example 1.

[0083] The heating process is as follows:

[0084]

heat recovery section

Preheating section

Heating section

soaking section

temperature °C

700

1100

1280

1250

time min

30

30

85

35

[0085]In this case, the round billet adopts one-sided heating, and the same method as in Example 1 is used to calculate the heat flux at the top of the round billet. The radiation coefficient of the upper part is 0.9, and the radiation coefficient of the side is linearly decreased from 0.9 to 0.25 from the top to the bottom.

[0086] The calculated temperature ...

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PUM

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Abstract

The invention relates to a soft measurement method for the size of austenite grains in a heating process of a steel billet. The soft measurement method comprises the following steps that (1) parameterinformation of a heating furnace and the steel billet is acquired; (2) initial temperature distribution and initial grain size distribution of the steel billet are set; (3) current temperature distribution and current grain size distribution of the steel billet are calculated; (4) a calculation result is displayed; and (5) the current temperature distribution and the current grain size distribution of the steel billet are used as initial values, and iterative calculation is carried out on the grain size until the whole heating process is completed. According to the soft measurement method, the size of the austenite grains at different positions of the steel billet is dynamically calculated, so that the size of the grains inside the steel billet can be visualized, the heating temperature and the heating time can be more reasonably controlled, the heating quality of the steel billet is improved, and the energy waste is reduced; and the problems that in the prior art, the dynamic changeof the austenite grains in the high-temperature process cannot be learned, then energy waste is caused, furthermore, the interior structure of the steel billet is thick, and the product performance isinfluenced are solved.

Description

technical field [0001] The invention relates to the technical field of steel rolling, in particular to a soft measurement method for the size of austenite grains in the heating process of steel billets. Background technique [0002] The purpose of heating the billet in the heating furnace is to ensure the uniformity of the structure and increase the plasticity of the material, so that the rolling mill can be thinned smoothly. At present, in advanced iron and steel enterprises, the heating furnace uses a mathematical model to automatically heat the billet. The general method is: according to the position of the billet in the heating furnace, the temperature is calculated according to the temperature of the thermocouple in the furnace, and then according to the rhythm of rolling, The furnace gas temperature is dynamically controlled, so that when the billet is discharged from the furnace, it reaches the target temperature and soaking time specified in the process. [0003] Ho...

Claims

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Application Information

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IPC IPC(8): C21D11/00C21D9/70
CPCC21D11/00C21D9/70C21D2211/001
Inventor 吕立华邓龙刘运华王彦峰许娜
Owner BAOSHAN IRON & STEEL CO LTD
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