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Hot rolling ferrite/bainite high strength steel plate and manufacturing method thereof

A high-strength steel plate and a manufacturing method technology, applied in the field of steel material engineering, can solve the problems of high cost, high manganese content, high requirements, etc., and achieve the effects of excellent formability, high hole expansion rate, and cost reduction.

Inactive Publication Date: 2014-01-15
JIGANG GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Publication No. CN101603153A discloses a hot-rolled ferritic bainite dual-phase steel and its manufacturing method. P≤0.020%, S≤0.020%, 0.40~0.60%Cr, 0.02~0.04%Nb, high manganese content, and contains precious microalloying element Nb, the cost is also high, especially its manufacturing method requires low temperature without recrystallization Controlled rolling (finish rolling at 800-830°C) requires high capacity of hot-rolling equipment, and the air-cooling time of segmental cooling is required to be 12-15S. The requirements for the length and cooling capacity of laminar cooling line are too high. very difficult

Method used

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  • Hot rolling ferrite/bainite high strength steel plate and manufacturing method thereof
  • Hot rolling ferrite/bainite high strength steel plate and manufacturing method thereof
  • Hot rolling ferrite/bainite high strength steel plate and manufacturing method thereof

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Effect test

Embodiment 1

[0035] A hot-rolled ferritic bainite high-strength steel, the chemical composition of which is shown in Table 1.

[0036] A production method of hot-rolled ferritic bainite high-strength steel, comprising molten iron pretreatment-converter smelting-alloy fine-tuning argon blowing-LF-continuous casting-hot continuous rolling. The hot continuous rolling process is as follows: slab thickness 135mm, heating temperature 1180°C, holding time 2h, rough rolling start temperature 1130°C, finish rolling temperature 1070°C, 3-pass rolling to 33mm intermediate billet, finish rolling stage The rolling start temperature is 1020°C, the final rolling temperature is 880°C, then cooled to 729°C at a cooling rate of 64°C / S, air-cooled for 3S, and then water-cooled to the target coiling temperature at 56°C / S, and the coiling temperature is 496°C. The thickness of the finished steel plate is 4mm.

Embodiment 2

[0038] A hot-rolled ferritic bainite high-strength steel, the chemical composition of which is shown in Table 1.

[0039] A production method of hot-rolled ferritic bainite high-strength steel, comprising molten iron pretreatment-converter smelting-alloy fine-tuning argon blowing-LF-continuous casting-hot continuous rolling. Described continuous hot rolling process is:

[0040] The thickness of the slab is 135mm, the heating temperature is 1160°C, the holding time is 2.5h, the rough rolling start temperature is 1110°C, the final rolling temperature is 1060°C, and the intermediate billet of 33mm is rolled in 3 passes. The rolling temperature is 880°C, then cooled to 708°C at a cooling rate of 58°C / S, air-cooled for 3.5S, and then water-cooled to the target coiling temperature at 52°C / S, the coiling temperature is 462°C, and the thickness of the finished steel plate is 4.5mm.

Embodiment 3

[0042] A hot-rolled ferritic bainite high-strength steel, the chemical composition of which is shown in Table 1.

[0043] A production method of hot-rolled ferritic bainite high-strength steel, comprising molten iron pretreatment-converter smelting-alloy fine-tuning argon blowing-LF-continuous casting-hot continuous rolling. The hot continuous rolling process is as follows: slab thickness 135mm, heating temperature 1230°C, holding time 1.5h, rough rolling start temperature 1140°C, finish rolling temperature 1070°C, 3-pass rolling to a 35mm intermediate billet, finish rolling Stage rolling temperature is 1020°C, final rolling temperature is 840°C, then cooled to 668°C at a cooling rate of 37°C / S, air-cooled for 4S, then water-cooled to the target coiling temperature at 28°C / S, the coiling temperature is 413°C, The thickness of the finished steel plate is 6.0mm.

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Abstract

The invention relates to hot rolling ferrite / bainite high strength steel and a manufacturing method thereof. The hot rolling ferrite / bainite high strength steel comprises the following main chemical components by mass percentage: 0.05-0.10% of C, 0.20-0.50% of Si, 0.80-1.30% of Mn, 0.02-0.06% of Alt, 0.40-0.8% of Cr, less than or equal to 0.09% of P, less than or equal to 0.010% of S, less than or equal to 0.006% of N, and the balance of Fe and unavoidable impurities. The manufacturing method of the hot rolling ferrite / bainite high strength steel comprises the steps of molten iron pretreatment, converter smelting, alloy fine adjustment and argon blowing, LF (ladle furnace) refining, a continuous casting heating technology, a rolling technology, a cooling technology and a rolling technology. According to the steel and the method, C and Mn contents are strictly controlled based on the composition of C-Mn steel, an Si content is reduced, Cr and P are added appropriately, Nb, V and Ti microalloy elements are not added, noble alloys such as Mo and Ni are not added, the cost is lowered greatly, the hot rolling ferrite / bainite dual phase steel with the tensile strength reaching 550-650MPa is obtained by adopting an appropriate rolling and cooling control technology, a hole expansion rate is high, and the forming property is excellent.

Description

technical field [0001] The invention belongs to the field of iron and steel material engineering, and in particular relates to a low-cost hot-rolled ferritic bainite high-strength steel plate and a manufacturing method thereof. Background technique [0002] In recent years, with the rapid development of the modern automobile industry, energy shortages and environmental pressures are increasing, coupled with the continuous improvement of global environmental protection legislation, the development of automobile technology has been promoted to focus on energy conservation, environmental protection and safety. Realizing vehicle lightweight, reducing fuel consumption, increasing load capacity, and improving transportation efficiency have become the most common keywords. As of 2012, China's automobile production has exceeded 19 million, and it has maintained its position as the world's largest automobile producer for four consecutive years. Iron and steel materials are currently...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/18C22C33/04C21D8/02
Inventor 宋振官孙卫华王金华夏茂森魏代斌张磊王丰祥梁英梁亚
Owner JIGANG GRP
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