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A rolling process for controlling decarburization of 42crmo steel bloom hot-rolled wire rod

A hot-rolled wire rod and bloom technology is applied in the field of metallurgy, and can solve the problems of unpublished research reports on the control technology of decarburization, and achieve the effects of avoiding severe decarburization, reducing decarburization, and solving decarburization exceeding the standard.

Active Publication Date: 2016-06-22
武安市裕华钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] To sum up, there is no public research report on the control technology of wire rod decarburization in the rolling process of 42CrMo steel bloom.

Method used

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  • A rolling process for controlling decarburization of 42crmo steel bloom hot-rolled wire rod
  • A rolling process for controlling decarburization of 42crmo steel bloom hot-rolled wire rod
  • A rolling process for controlling decarburization of 42crmo steel bloom hot-rolled wire rod

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Using 325mm×280mm bloom heating-opening-pit cooling-heating-wire rolling-roller cooling process to produce Φ13mm wire rod for high-strength bolts, the chemical composition of the 42CrMo steel used is: C: 0.38~0.45 %, Si: 0.17~0.37%, Mn: 0.50~0.80%, S: ≤0.030%, P≤0.030%, Cr: 0.90~1.20%, Ni: ≤0.25%, Cu: ≤0.030, Mo: 0.15~0.25 %, the balance being Fe, a rolling process for controlling the decarburization of 42CrMo steel bloom hot-rolled wire rods, carried out according to the following steps:

[0033] (1) The 42CrMo steel 280mm × 325mm bloom of the above-mentioned composition is blanked. During the blanking process, the parameters of the blanking heating furnace are: heating temperature 1200°C, heating time 8h, and residual oxygen controlled at 2.5%;

[0034] (2) Grind the 160mm×160mm steel billet after billet opening, grind 4mm, cut off the head and tail 200mm, and grind the corners 5mm, and there should be no right angles at the corners. For this reason, the radius of the c...

Embodiment 2

[0042] Using 325mm×280mm bloom heating-opening-pit cooling-heating-wire rolling-roller cooling process to produce Φ10mm wire rod for high-strength bolts, the chemical composition of the 42CrMo steel used is: C: 0.38~0.45 %, Si: 0.17~0.37%, Mn: 0.50~0.80%, S: ≤0.030%, P≤0.030%, Cr: 0.90~1.20%, Ni: ≤0.25%, Cu: ≤0.030, Mo: 0.15~0.25 %, the balance being Fe, a rolling process for controlling the decarburization of 42CrMo steel bloom hot-rolled wire rods, carried out according to the following steps:

[0043] (1) The 42CrMo steel 280mm × 325mm bloom of the above-mentioned composition is blanked, and the parameters of the blanking heating furnace during the blanking process are: heating temperature 1180°C, heating time 8h, residual oxygen controlled at 3.5%;

[0044] (2) Grind the 160mm×160mm steel billet after billeting, grind 3mm, cut off the head and tail by 150mm, and grind the corner by 5mm, and there should be no right angle at the corner. For this reason, the radius of the co...

Embodiment 3

[0050] Using 325mm×280mm bloom heating-opening-pit cooling-heating-wire rolling-roller cooling process to produce Φ10mm wire rod for high-strength bolts, the chemical composition of the 42CrMo steel used is: C: 0.38~0.45 %, Si: 0.17~0.37%, Mn: 0.50~0.80%, S: ≤0.030%, P≤0.030%, Cr: 0.90~1.20%, Ni: ≤0.25%, Cu: ≤0.030, Mo: 0.15~0.25 %, the balance being Fe, a rolling process for controlling the decarburization of 42CrMo steel bloom hot-rolled wire rods, carried out according to the following steps:

[0051] (1) The 42CrMo steel 280mm × 325mm bloom of the above composition is blanked, and the parameters of the blanking heating furnace during the blanking process are: heating temperature 1150°C, heating time 9h, and residual oxygen content controlled at 4.5%;

[0052] (2) Grind the 160mm×160mm steel billet after billet opening, grind 2mm, cut off the head and tail 100mm, and grind the corners by 3mm, and there should be no right angles at the corners. For this reason, the radius of...

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PUM

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Abstract

The invention discloses a rolling process for controlling the decarburization of a 42CrMo steel bloom hot-rolled wire rod, belonging to the technical field of metallurgy. The present invention is carried out according to the following steps: open the 42CrMo steel bloom, control the temperature, time and residual oxygen amount of the heating furnace for opening the billet; grind the steel billet after the bloom, and grind the surface and corners; and then carry out rolling , the rolling heating furnace controls the temperature, time, residual oxygen and the residence time of each billet; during rolling, the rough rolling temperature is 980-1020°C, the finish rolling temperature is 900°C, and the spinning temperature is 850°C; after rolling, the temperature is greater than The cooling rate of 5-15°C / S is used to rapidly cool down to 600°C-650°C, keep warm to about 300-350°C for coil collection, and the speed of the roller table is controlled at 0.4-0.5m / s. The invention basically eliminates the decarburized layer of the 42CrMo steel bloom hot-rolled wire rod, so that the thickness of the decarburized layer is controlled to be less than or equal to 0.5% D, and the thickness of the decarburized layer above 95% reaches or is close to zero.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a rolling process for controlling the decarburization of a 42CrMo steel bloom hot-rolled wire rod. Background technique [0002] At present, my country's iron and steel industry is seriously overcapacity. At the same time, my country imports a large amount of high-value-added steel, especially steel for high-end engine bolts. The steel for domestic passenger cars, high-end commercial vehicles, aircraft, ships, trains and other high-end engine bolts of grade 12.9 has been produced by individual foreign companies. Manufacturer monopoly. The overcapacity of steel in my country and the shortage of high-end products, the development of China's automobile, aircraft and other industries and the improvement of national defense, social and economic benefits require systematic and detailed research on high-strength bolt steel such as 42CrMo. [0003] In actual production, th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D11/00C21D1/34B21B37/74C22C38/22
Inventor 徐东郑冰
Owner 武安市裕华钢铁有限公司