Control method for heat treatment of steel pipe quenching furnace

A control method and quenching furnace technology, applied in the direction of heat treatment process control, heat treatment furnace, heat treatment equipment, etc., can solve the problems of difficult operation, high energy consumption, unstable product quality, etc. tracking effect

CN110607433AInactive Publication Date: 2019-12-24BAOSHAN IRON & STEEL CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2019-12-24
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to a control method for heat treatment of a steel pipe quenching furnace. The control method comprises the steps that a secondary model control system is arranged between a primary control system and an MES, the secondary model control system comprises a material tracking module, a temperature tracking module, a temperature setting module and an air-fuel ratio optimization module, the material tracking module realizes position tracking of a steel pipe in the furnace, the temperature tracking module realizes temperature calculation of the steel pipe in the furnace, the temperature setting module realizes optimal setting of the temperature in the furnace, and the air-fuel ratio optimization module realizes optimal setting of the air-fuel ratio. The problems that due tothe lack of secondary control in an existing heat treatment process, for small-batch and multi-variety conditions, furnace emptying needs to be carried out according to experience, operation is particularly difficult, product quality is unstable, and energy consumption is large are solved.
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Description

technical field

[0001] The invention relates to the technical field of metallurgical production, and relates to a heat treatment process, in particular to a control method for heat treatment of a steel pipe quenching furnace. Background technique

[0002] The heat treatment process is the key link to control product performance. It has strict requirements on furnace gas temperature, furnace time and furnace atmosphere. It is hoped that when the steel pipe exits the quenching furnace, it will have a uniform austenite state and less oxidation and decarburization on the surface. These process requirements must be realized through precise control of the heat treatment process. At present, it is generally controlled according to the process schedule, including the furnace gas temperature, gear position and beat of each section. The process schedule is classified according to products and specifications. In the actual production process, the operator manually enters the process s...

Examples

Embodiment

[0084] (1) A quenching furnace has 10 tooth positions, and there are 3 physical sections including the furnace tail section, heating section, and soaking section. The furnace tail section does not control the temperature. The positions of each control section and the thermocouple are as follows, assuming that the furnace The gas temperature is linearly distributed along the position of the thermocouple, see Table 1 for details:

[0085] Table I

[0086]

[0087] (2) The temperature information measured by the thermocouple obtained by L1 is shown in Table 1. The current calorific value is 2800kcal, and the calorific value fluctuation range of the last cycle is within 20kcal, the calorific value fluctuation is small, and the residual oxygen detected by the flue gas is 2 %.

[0088] (3) The steel specifications of all products in the current quenching furnace are the same. The process requires that the temperature of the steel pipe should be >800°C, the corresponding holding ...