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On-line normalizing method for SAE1050M round steel

A round steel, normalizing technology, applied in the direction of furnace type, furnace, heat treatment furnace, etc., can solve the problems of poor heat treatment effect, uneven performance of the same furnace, low production efficiency, etc., to reduce the process and avoid uneven heating of the same furnace , to avoid the effect of excessive consumption

Active Publication Date: 2021-05-25
NANJING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to its poor sealing and large heat loss, the thermal efficiency of the furnace is not high, and there are problems such as uneven performance of the same furnace, low production efficiency, and poor heat treatment effect.

Method used

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  • On-line normalizing method for SAE1050M round steel

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Embodiment 1: 1. The temperature of the soaking section of the heating furnace is controlled at 1080°C before rolling, and the temperature is controlled at 880°C before the last rolling, and the specification of the rolled round steel is Φ34mm.

[0012] 2. The cooling stage is cooled by a step-by-step cooling bed, the temperature of the upper cooling bed is 860°C, the temperature is lowered to 400°C at a cooling rate of ≤1.0°C / s, and the temperature is lowered from 400°C to 100°C at a cooling rate of ≤2.0°C / s.

Embodiment 2

[0013] Embodiment 2: 1. The temperature of the soaking section of the heating furnace before rolling is controlled at 1070° C., and the temperature before the last rolling is controlled at 870° C., and the specification of the rolled round steel is Φ30.4 mm.

[0014] 2. The cooling stage is cooled by a step-by-step cooling bed, the temperature of the upper cooling bed is 855°C, the temperature is lowered to 400°C at a cooling rate of ≤1.0°C / s, and the temperature is lowered from 400°C to 100°C at a cooling rate of ≤2.0°C / s.

Embodiment 3

[0015] Embodiment 3: 1. The temperature of the soaking section of the heating furnace before rolling is controlled at 980°C, and the temperature before the last rolling is controlled at 790°C, and the specification of the rolled round steel is Φ25mm.

[0016] 2. The cooling stage is cooled by a step-by-step cooling bed. The temperature of the upper cooling bed is 790°C, and the temperature is lowered to 400°C at a cooling rate of ≤1.0°C / s, and from 400°C to 100°C at a cooling rate of ≤2.0°C / s.

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Abstract

The invention discloses an on-line normalizing method for SAE1050M round steel. The normalizing method is directly embedded into a rolling cooling process, the round steel does not need to be reheated by adopting a car bottom type heat treatment furnace, the working procedures are reduced, the excessive consumption of energy is avoided, and meanwhile, the problems of non-uniform heating of the same furnace and non-uniform product performance caused by the characteristics of the car bottom type heat treatment furnace are solved. After being normalized, the SAE1050M round steel with the specification of phi 25-35 mm can obtain uniformly distributed positive structures of blocky ferrite and flaky pearlite, and the actual grain size can be controlled at 6-9 grades; and the hardness of a cross section is 180-240 HBW, the hardness of the 1 / 4D position is 190-240 HBW, and the hardness dispersion difference of the 1 / 4D position of the same cross section can be controlled to be smaller than or equal to 10 HBW.

Description

technical field [0001] The invention relates to a steel normalizing method, in particular to an on-line normalizing method for SAE1050M round steel. Background technique [0002] Special steel production enterprises generally use car bottom (also known as trolley type) heat treatment furnaces to normalize SAE1050M 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. The car bottom heat treatment furnace is generally heated by a flame furnace. The heating fuel can be natural gas, coke oven gas, blast furnace gas, fuel oil, coal and other fuels, and it can also be heated by resistance. Due to its poor sealing and large heat loss, the thermal effic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/28C21D8/06C21D9/52
CPCC21D1/28C21D8/065C21D9/525C21D2211/005C21D2211/009Y02P10/143
Inventor 赵军周蕾王建鹰江雁
Owner NANJING IRON & STEEL CO LTD