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Rolling technology for controlling decarbonization of 42CrMo steel bloom hot-rolled wire rod

A hot-rolled wire rod and bloom technology, which is applied in the field of metallurgy, can solve the problems of unpublished research reports on decarburization control technology, and achieve the effects of avoiding severe decarburization, solving decarburization exceeding the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

Active Publication Date: 2014-11-12
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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  • Rolling technology for controlling decarbonization of 42CrMo steel bloom hot-rolled wire rod
  • Rolling technology for controlling decarbonization of 42CrMo steel bloom hot-rolled wire rod
  • Rolling technology for controlling decarbonization 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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Abstract

The invention discloses a rolling technology for controlling the decarbonization of a 42CrMo steel bloom hot-rolled wire rod, belonging to the field of metallurgy technology. The rolling technology comprises the following steps: blooming a 42CrMo steel bloom, wherein the temperature, time and remaining oxygen of a blooming heating furnace are all under control; polishing the surface and corners of the bloomed steel bloom; then rolling, wherein the temperature, time, remaining oxygen of a rolling heating furnace, as well as the retention time of each steel bloom are all under control, and in rolling, the rough rolling temperature is 980-1020DEG C, the finish rolling temperature is 900DEG C, and the wire drawing temperature is 850DEG C; rapidly cooling to 600DEG C-650DEG C at the cooling speed of 5-15DEG C / S after rolling, reeling after the temperature is held to about 300-350DEG C, wherein the speed of a roller bed is controlled to be 0.4-0.5m / s. According to the rolling technology, the decarbonization layer of the 42CrMo steel bloom hot-rolled wire rod is basically eliminated, and the thickness of the decarbonization layer is controlled to be no more than 0.5%D, and the thickness of more than 95% of decarbonization layer reaches or is close to 0.

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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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
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