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A kind of induction heating normalizing method of 38b3 round steel

A technology of induction heating and round steel, applied in the direction of improving process efficiency, improving energy efficiency, etc., can solve the problems of low production efficiency and uneven performance of the same furnace, and achieve the effect of improving production efficiency and product quality

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

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a normalizing treatment method for 38B3 round steel, obtain the structure and performance that meet the technical requirements of users, and solve the problems of uneven performance and low production efficiency in the same furnace

Method used

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  • A kind of induction heating normalizing method of 38b3 round steel

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] 1.1 38B3 round steel rolling process:

[0019] High temperature heating at 1110°C, high temperature final rolling at 860°C, rapid cooling after rolling, cooling rate ≤3°C / s. Round steel specification Φ28mm.

[0020] 1.2 38B3 medium frequency induction heating normalizing process: the induction coil is fixed on the roller table, and a single steel rod in the induction coil runs in a straight line (that is, the inner penetration type, a single steel rod passes through the induction coil in a straight line under the drive of the roller wheel. Pass). The working frequency of the induction coil is 3000 HZ. The steel bar heating temperature is 830°C, the steel bar running speed is 3m / min, and the running time is 6min.

[0021] 1.3 38B3 steel normalizing cooling process:

[0022] The air cooling time is 30S, and then enter the slow cooling section. The slow cooling section uses a single steel rod in the sleeve to run in a straight line for slow cooling (the sleeve is a cy...

Embodiment 2

[0024] 2.1 38B3 round steel rolling process: high temperature heating 1120℃, high temperature final rolling 870℃, fast cooling after rolling, cooling rate ≤3℃ / s; round steel specification Φ29mm.

[0025] 2.2 38B3 medium frequency induction heating normalizing process: fix the induction coil, and adopt the linear operation mode of a single steel rod in the induction coil. The working frequency of the induction coil is 3500 HZ. Temperature The heating temperature of the steel rod is 835°C, the running speed of the steel rod is 3m / min, and the running time is 6min.

[0026] 2.3 38B3 steel normalizing cooling process:

[0027] The air cooling time is 40S, and then enter the slow cooling section. The slow cooling section adopts the slow cooling of a single steel rod running in a straight line in the sleeve, the steel rod running speed is 3m / min, and the running time is 6min. The temperature of the steel rod when the sleeve exits on the cooling bed is ≤50°C.

Embodiment 3

[0029] 3.1 38B3 round steel rolling process: high temperature heating 1130℃, high temperature final rolling 880℃, fast cooling after rolling, cooling rate ≤3℃ / s; round steel specification Φ30mm.

[0030] 3.2 38B3 medium frequency induction heating normalizing process: fix the induction coil, and adopt the linear operation mode of a single steel rod in the induction coil. The working frequency of the induction coil is 4000HZ. The steel bar heating temperature is 840°C, the steel bar running speed is 3m / min, and the running time is 6min.

[0031] 3.3 38B3 steel normalizing cooling process:

[0032] The air cooling time is 50S, and then enter the slow cooling section. The slow cooling section adopts the slow cooling of a single steel rod running in a straight line in the sleeve, the steel rod running speed is 3m / min, and the running time is 6min. The temperature of the steel rod when the sleeve exits on the cooling bed is ≤50°C.

[0033] Such as figure 1 The metallographic di...

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Abstract

The invention discloses an induction heating normalizing method of 38B3 round steel. The induction heating normalizing method is characterized in that at the stage of medium-frequency induction heating normalizing, an induction coil is fixed, and a linear operating manner of a single steel rod in the induction coil is adopted; and at the stage of slow cooling, the induction coil is not powered onand does not achieve heating, and a linear operating manner of a single steel rod in the coil is adopted. By means of the method, the problems that in the existing 38B3 round steel normalizing process, heat efficiency is not high, and same-furnace heating and product performance are not uniform are solved; a 38B3 round steel product meeting structure and performance requirements can be obtained; the product quality is improved; and the production efficiency is improved.

Description

technical field [0001] The invention relates to the field of special steel production, in particular to the normalizing process of 38B3 round steel. Background technique [0002] Special steel production enterprises generally use a car-bottom (also known as trolley-type) heat treatment furnace to normalize round steel. The furnace bottom of the car-bottom heat treatment furnace is a movable trolley, and the workpiece is arranged on the special pad iron evenly distributed on the surface of the trolley. When heating, the trolley is pulled into the furnace by the traction mechanism. After heating, the traction mechanism pulls the trolley The trolley is pulled out of the furnace to unload. [0003] The car bottom heat treatment furnace is generally heated by a flame furnace. The heating fuel can be natural gas, coke oven gas, producer gas, fuel oil, coal and other fuels, and it can also be heated by electricity. The car-bottom heat treatment furnace has poor sealing performanc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D1/28C21D1/42C21D8/06
CPCC21D1/28C21D1/42C21D8/065C21D2211/005C21D2211/009Y02P10/25
Inventor 王磊王建鹰赵军
Owner NANJING IRON & STEEL CO LTD