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Continuous furnace high-temperature heating method for TA titanium and Q235 steel composite plate/coil raw material blank

A technology for high-temperature heating and cladding, which is used in workpiece heating devices, metal processing equipment, workpiece surface treatment equipment, etc., which can solve the problem of difficult-to-roll titanium steel clad plate rolling, difficult-to-roll production in large rolling mills, and does not involve heating time, etc. question

Inactive Publication Date: 2021-07-23
CHENGDU ADVANCED METAL MATERIALS IND TECH RES INST CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The α-type TA1~TA3 industrial pure titanium and Q235 steel clad plate (coil) is a typical titanium steel clad plate. The problem that must be considered in the heating before rolling and cladding is: β phase of α-type TA1~TA3 industrial pure titanium The transition temperature is about 890°C. Therefore, it is hoped that the maximum temperature during the heating process should not be higher than 890°C, otherwise there will be a large amount of Ti-Fe intermetallic brittle compounds and brittle TiC, which will make it difficult to achieve subsequent rolling of titanium-steel clad plates. system
However, after reading this document carefully, it is found that even among the three samples taken from the composite board produced under the conditions of 900°C heating temperature and 80% deformation, only two of them meet the requirements of GB / T 8547-2006 standard. That is to say, the qualification rate of the titanium-steel clad plate produced by the optimal process recommended by this document is only two-thirds
In addition, this document only refers to the heating temperature, and does not involve the more critical heating time
[0006] Journal of Iron and Steel Research, Vol. 31, No. 2 (February 2019), pp. 214-220, "Technology and Properties of Vacuum Blanking Hot-rolled Titanium / Steel Composite Plate" literature, using a heating temperature of 850°C and holding it for 2 hours. Rolling can produce titanium steel clad plates that meet the requirements, but the heating temperature of 850 ° C has not yet reached the γ (austenite) transformation point of Q235 steel at 860 ° C, that is, the Q235 steel at this time is still α-type iron The load of the rolling mill is extremely high, and it is difficult for the large rolling mills of ordinary steel mills to realize subsequent rolling production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The strip rolling mill production line of an iron and steel plant uses a three-stage walking continuous heating furnace to heat a composite plate / coil raw material billet of 100mm (thickness) × 1750mm (width) × 11000mm (length) composed of α-type TA1 industrial pure titanium and Q235 steel , the sum of the thickness of the two titanium plates is 30.0mm, and the thickness of a single titanium plate is 15.0mm.

[0036] The preheating section of the three-stage continuous heating furnace controls the air excess coefficient to be 1.50, the furnace temperature in the preheating section is 950°C, the heating section controls the air excess coefficient to 1.50, the heating section furnace temperature is controlled to 930°C, and the soaking section controls the air excess coefficient 1.50, the furnace temperature in the soaking section is controlled at 910°C, and the total heating time is controlled at 6.0h. After the composite raw material billet is out of the furnace, it is ro...

Embodiment 2

[0039] The strip rolling mill production line of an iron and steel plant uses a three-stage walking continuous heating furnace to heat a composite plate / coil raw material billet of 250mm (thickness) × 1800mm (width) × 11000mm (length) composed of α-type TA2 industrial pure titanium and Q235 steel , the sum of the thickness of the two titanium plates is 50mm, and the thickness of a single titanium plate is 25mm.

[0040] The preheating section of the three-stage continuous heating furnace controls the air excess coefficient to be 1.30, the furnace temperature in the preheating section is 950°C, the heating section controls the air excess coefficient to 1.30, the heating section furnace temperature is controlled to 920°C, and the soaking section controls the air excess coefficient 1.30, the temperature of the furnace in the soaking section is controlled at 900°C, and the total heating time is controlled at 8.5 hours. After the composite raw material billet is out of the furnace, ...

Embodiment 3

[0043] The strip rolling mill production line of an iron and steel plant uses a three-stage walking continuous heating furnace to heat a composite plate / coil raw material billet of 400mm (thickness) × 1800mm (width) × 11000mm (length) composed of α-type TA3 industrial pure titanium and Q235 steel , the sum of the thickness of the two titanium plates is 90mm, and the thickness of a single titanium plate is 45mm.

[0044] The preheating section of the three-stage continuous heating furnace controls the air excess coefficient to be 1.40, the furnace temperature in the preheating section is 950°C, the heating section controls the air excess coefficient to 1.40, the heating section furnace temperature is controlled to 910°C, and the soaking section controls the air excess coefficient 1.40, the furnace temperature in the soaking section is controlled at 890°C, and the total heating time is controlled at 10.0h. After the composite raw material billet is out of the furnace, it is rolle...

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Abstract

The invention relates to the field of titanium-steel composite material production, in particular to a continuous furnace high-temperature heating method for a TA titanium and Q235 steel composite plate / coil raw material blank, and aims at solving the technical problem about providing the continuous furnace high-temperature heating method for a TA titanium and Q235 steel composite plate / coil raw material blank. The continuous furnace high-temperature heating method comprises the following steps that TA titanium and Q235 steel are assembled to obtain the raw material blank, the raw material blank enters a three-section type continuous heating furnace, and preheating, heating and soaking are conducted in sequence, wherein the hearth temperature of the preheating section is 930-950 DEG C, and the coefficient of excess air is 1.30-1.50; the hearth temperature of the heating section is 910-930 DEG C, and the coefficient of excess air is 1.30-1.50; and the hearth temperature of the soaking section is 890-910 DEG C, and the coefficient of excess air is 1.30-1.50. The titanium-steel composite plate / coil raw material blank heated by the method is more smoothly rolled subsequently, and an obtained titanium-steel composite plate / coil is excellent in quality.

Description

technical field [0001] The invention relates to the field of production of titanium-steel composite materials, in particular to a continuous furnace high-temperature heating method for TA titanium (that is, α-type TA1-TA3 titanium) and Q235 steel composite plate / coil raw materials. Background technique [0002] Titanium-steel composite plate is a new material that combines the advantages of steel and titanium. Compared with titanium and titanium alloys alone, it not only saves titanium resources, reduces costs, but also has good corrosion resistance. It has been favored by countries all over the world. It is widely used in petroleum, chemical industry, textile printing and dyeing, salt making, nuclear power, marine engineering and other fields. [0003] The main production methods of titanium steel clad plates are explosive clad method, diffusion clad method, explosive clad-rolling method and rolling clad method. The titanium steel clad plate produced by the explosive cladd...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B45/00
CPCB21B45/004
Inventor 彭琳李军刘明郭跃华钟勇
Owner CHENGDU ADVANCED METAL MATERIALS IND TECH RES INST CO LTD