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Hot-rolling transformation-induced plasticity steel plate and preparation method thereof

A technology of phase change induced plasticity and hot-rolled steel plate, which is applied in the field of metallurgy, can solve the problems of poor toughness of continuous casting slabs, difficulty in pickling, thick iron scale, etc., and achieve good impact toughness, strength and good plasticity

Inactive Publication Date: 2011-04-13
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the high silicon content makes TRIP steel have the following problems in industrial production: (a) the continuous casting slab has poor toughness and is not easy to produce; (b) it is easy to produce thick iron oxide scale during hot rolling, which is not easy to pickle Affect the surface quality of the strip; (c) When hot-dip galvanizing, high Si content makes the wettability of the zinc layer worse and easily forms a brittle alloy layer, thereby weakening the bonding force between the coating and the substrate
However, the silicon content of the existing TRIP steel is too high, which makes the toughness of the continuous casting slab of the steel plate poor, and deteriorates the hot rolling performance and coating performance of the steel.

Method used

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  • Hot-rolling transformation-induced plasticity steel plate and preparation method thereof
  • Hot-rolling transformation-induced plasticity steel plate and preparation method thereof
  • Hot-rolling transformation-induced plasticity steel plate and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The low-carbon silicon steel is smelted into steel ingots, the composition of which is C0.19%, Mn1.37%, Si0.68%, Al0.54%, P0.0068%, S0.0068% by weight percentage, and the balance is Fe. Heat the ingot to 1200±10°C, keep it warm for 1.5hr, and forge it into a billet.

[0024] The billet is loaded into the heating furnace under the condition of 750°C by hot charging, heated to 1200±10°C, and kept for 1 hour. After the heat preservation is completed, it is transferred to the rolling mill through the conveying roller table, and the rolling mill is used for rough rolling and finish rolling. , the rough rolling is 3 passes, the starting rolling temperature is 1060°C, the second rolling temperature is 980°C, the third rolling temperature is 900°C, and the rough rolling total deformation is 47%.

[0025] The finishing rolling consists of 2 passes, the first finishing rolling temperature is 870°C, and the final rolling temperature is 800°C. The total deformation of finish rolli...

Embodiment 2

[0040] Low-carbon silicon steel is smelted into steel ingots, and its composition by weight percentage is C0.18%, Mn1.38%, Si0.67%, Al0.56%, P0.0075%, S0.0048%, Nb0.014%, The balance is Fe. Heat the steel ingot to 1200±10°C, keep it warm for 2 hours, and forge it into a steel billet.

[0041] Adopt the method of hot charging, put the steel billet into the heating furnace under the condition of 780°C, heat it to 1200±10°C, keep it for 1.5hr, after the heat preservation is completed, transfer it to the rolling mill through the conveying roller table, and use the rolling mill for rough rolling and finishing Rolling, rough rolling is 3 passes, the starting rolling temperature is 1080°C, the second rolling temperature is 1000°C, the third rolling temperature is 930°C, and the rough rolling total deformation is 45%.

[0042] The finishing rolling consists of 2 passes, the temperature of the first finishing rolling is 850°C, and the finishing rolling temperature is 780°C. The total...

Embodiment 3

[0057] Low-carbon silicon steel is smelted into steel ingots, and its composition is C0.18%, Mn1.39%, Si0.66%, Al0.58%, P0.0083%, S0.0050%, Nb0.036%, The balance is Fe. Heat the ingot to 1200±10°C, keep it warm for 1.5hr, and forge it into a billet.

[0058] The billet is loaded into the heating furnace under the condition of 800°C by hot charging method, heated to 1200±10°C, and kept for 2 hours. After the heat preservation is completed, it is transferred to the rolling mill through the conveying roller table, and the rolling mill is used for rough rolling and finish rolling. , the rough rolling is 3 passes, the starting rolling temperature is 1120°C, the second rolling temperature is 1020°C, the third rolling temperature is 960°C, and the rough rolling total deformation is 43%.

[0059] The finishing rolling consists of 2 passes, the temperature of the first finishing rolling is 820°C, and the finishing rolling temperature is 760°C. The total deformation of finish rolling ...

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Abstract

A hot-rolling transformation-induced plasticity steel plate and a preparation method thereof belong to the field of metallurgical technology. The steel plate comprises the following components by weight percentage: 0.18 to 0.20 percent of C, 1.30 to 1.45 percent of Mn, 0.60 to 0.70 percent of Si, 0.50 to 0.60 percent of Al, 0.009 percent or less than 0.009 percent of P, 0.007 percent or less than0.007 percent of S, 0 to 0.040 percent of Nb and the balance of Fe. The preparation method thereof comprises the steps of: smelting low-silicon and low-carbon steel into steel ingot; heating the steel ingot to 1200 plus / minus 10 DEG C to obtain billet through forging; loading the billet into a heating furnace, heating the billet to 1200 plus / minus 10 DEG C and keeping temperature for 1 to 2 hours; carrying out rough rolling and precision rolling; air cooling till the temperature reaches 700 to 760 DEG C; accelerating cooling at a speed of reducing 40 to 50 DEG C per second; and adopting a reeling machine for reeling. The hot-rolling transformation-induced plasticity steel plate prepared by the method has high intensity of tension and better impact ductility.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, in particular to a hot-rolled phase transformation-induced plastic steel plate and a preparation method thereof. Background technique [0002] The country's introduction of fuel tax policy has made consumers choose more cars with less fuel consumption and smaller displacement. The upgrading of the automobile industry must be accelerated. TRIP (Transformation Induced Plasticity) steel, also known as phase transformation induced plasticity steel, is a high-strength and high-plasticity steel developed in recent years. Used as an automobile steel plate, it can reduce the weight of the vehicle and reduce fuel consumption. At the same time, it has a strong energy absorption capacity, can resist plastic deformation during impact, and significantly improves the safety level of the automobile. It has obvious advantages. This kind of steel plate has become a hot spot for steel plates for automobiles re...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/06C22C38/12C22C33/04C21D8/02
Inventor 唐正友丁桦
Owner NORTHEASTERN UNIV LIAONING
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