Method for mixed heating of industrial pure titanium slab and industrial pure zirconium slab

Abstract

The application provides a mixed heating method for industrial pure titanium slabs and industrial pure zirconium slabs, belongs to the technical field of non-ferrous metal processing, and solves the problems of large physical performance difference and easy defect generation of industrial pure titanium and pure zirconium slabs, wherein the application firstly puts scrap steel slabs between the industrial pure titanium and zirconium slabs, heats the slabs to 620-650 DEG C in a preheating furnace, and then takes out the slabs; then the slabs are put into a heating furnace, and the heating time is greater than 165 minutes; the temperature system of the industrial pure titanium is as follows: a preheating section 800-870 DEG C, a heating section 870-990 DEG C, and a soaking section 900-940 DEG C; the temperature system of the industrial pure zirconium is as follows: a preheating section 760-830 DEG C, a heating section 830-950 DEG C, and a soaking section 860-900 DEG C; finally, the industrial pure titanium slabs and the industrial pure zirconium slabs are taken out for rolling, and the scrap steel slabs are returned to the material. The method provided by the application ensures that the performance of the industrial pure titanium and the industrial pure zirconium cannot be reduced and beta phase cannot be generated, and realizes that the industrial pure titanium and the industrial pure zirconium can be mixed and heated for continuous production.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of non-ferrous metal processing, and particularly relates to a mixed heating method for industrial pure titanium slab and industrial pure zirconium slab. BACKGROUND

[0002] In recent years, with the improvement of the research and development application level of new materials and the comprehensive national strength, the requirements for industrial pure titanium and pure zirconium are higher, and the application fields of industrial pure titanium and pure zirconium are wider and wider.

[0003] However, due to the limitation of smelting equipment capacity, the industrial pure zirconium slab is relatively thin, and the batch quantity is relatively small. The separate heating production in the steel rolling heating furnace has a greater impact on the efficiency and a higher cost, and the inaccurate heating temperature control can easily lead to the beta phase transformation in the hot working process.

[0004] The mixed heating of the industrial pure titanium slab and the industrial pure zirconium slab needs to overcome the differences in the heating system. In addition, the combustion heat load distribution and the heating process system also need to be reasonably controlled according to the differences in the thermal conductivity and the specific heat capacity of the industrial pure titanium slab and the industrial pure zirconium slab, so as to finally ensure that the heating quality of the industrial pure titanium slab and the industrial pure zirconium slab and the performance of the finished product meet the requirements. If the heating temperature is too high, the high-temperature deformation in the furnace cannot be out of the furnace, the surface and the edge of the finished product are peeled, the surface is rough, the air absorption layer is increased, and other defects occur. If the heating temperature is too low, the smooth rolling cannot be ensured. SUMMARY

[0005] The purpose of the application is to provide a mixed heating method for industrial pure titanium slab and industrial pure zirconium slab, so as to solve the problems of large differences in physical properties and slab specifications of industrial pure titanium and pure zirconium and easy defects.

[0006] The technical scheme of the application is a mixed heating method for industrial pure titanium slab and industrial pure zirconium slab, comprising the following steps:

[0007] Step one: put scrap steel slab between the industrial pure titanium slab and the industrial pure zirconium slab, and put it into a preheating furnace to heat to 620-650 DEG C and then take it out of the furnace;

[0008] Step two: put the industrial pure titanium slab, the industrial pure zirconium slab and the scrap steel slab into a heating furnace for heating, the heating time is greater than 165 minutes, the preheating time is greater than 90 minutes, the heating time is greater than 40 minutes, and the soaking time is greater than 35 minutes;

[0009] The heating furnace temperature system is three-stage heating of preheating section, heating section and soaking section, wherein: the industrial pure titanium temperature system is 800-870 DEG C in the preheating section, 870-990 DEG C in the heating section and 900-940 DEG C in the soaking section; the industrial pure zirconium temperature system is 760-830 DEG C in the preheating section, 830-950 DEG C in the heating section and 860-900 DEG C in the soaking section;

[0010] Step three: the industrial pure titanium slab, the industrial pure zirconium slab and the scrap steel slab are discharged and rolled.

[0011] Further, the preheating furnace and the heating furnace are both walking beam type slab heating furnaces.

[0012] Further, in step one, the preheating furnace heating time is greater than or equal to 160 minutes, wherein the first heating section heating time is greater than or equal to 75 minutes, the second heating section heating time is greater than or equal to 45 minutes and the soaking section heating time is greater than or equal to 40 minutes; the preheating furnace temperature system is three-stage heating of the first heating section, the second heating section and the soaking section, wherein: the first heating section is 450-680 DEG C, the second heating section is 650-780 DEG C and the soaking section is 650-720 DEG C.

[0013] Further, in steps one and two, the slab charging sequence from the charging end to the discharging end is the industrial pure titanium slab, the scrap steel slab and the industrial pure zirconium slab.

[0014] Further, in steps one and two, the slab charging mode is that the industrial pure titanium slab and the industrial pure zirconium slab are charged in the middle and the scrap steel slab is charged on the left and the right.

[0015] The beneficial effects of the present application are as follows: the mixed heating of the industrial pure titanium slab, the industrial pure zirconium slab and the scrap steel slab is used, the preheating temperature is reasonably controlled and the furnace temperature, the heating time and the heating speed of each section of the heating furnace are reasonably controlled, the industrial pure titanium slab and the industrial pure zirconium slab are successfully heated in the same furnace, the performance of the industrial pure titanium and the industrial pure zirconium is ensured not to be reduced and the beta phase is not generated, the industrial pure titanium and the industrial pure zirconium can be mixed and heated for continuous production, the production line is effectively expanded and the profit point is created. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is the slab charging diagram when mixed heating in the heating furnace;

[0017] Figure 2 It is the metallographic structure photo diagram of the industrial pure titanium prepared according to the embodiment 1 of the present application.

[0018] Figure 3 It is the metallographic structure photo diagram of the industrial pure zirconium prepared according to the embodiment 1 of the present application.

[0019] In the figure: 1-industrial pure zirconium slab; 2-scrap steel slab; 3-industrial pure titanium slab. Detailed Implementation

[0020] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0021] In the following embodiments: the industrial pure titanium slabs used are TA1 and TA2, with specifications of (195-223) × (1000-1095) × (5440-11850) mm; the industrial pure zirconium slabs are Zr-3, with specifications of (162-170) × (1000-1095) × (5440-11850) mm; and the scrap steel slabs have specifications of 220 × 1260 × 8500 mm. Every four slabs constitute one physical segment.

[0022] The process flow of the hot rolling production line is as follows: continuous casting slab → preheating furnace → heating furnace → hot roll mill rolling into shape.

[0023] The slab placement method is as follows: industrial pure titanium slabs and industrial pure zirconium slabs are placed in the middle, while scrap steel slabs are placed on the left and right sides.

[0024] The order of billet loading into the furnace is as follows: from the furnace inlet end to the furnace outlet end, the billets are industrial pure titanium slabs, scrap steel slabs, and industrial pure zirconium slabs.

[0025] Example 1

[0026] Step 1: Place the slabs into the preheating furnace according to the set loading sequence and material distribution method. The loading interval is 8 minutes per slab. The temperature of the first heating section of the preheating furnace is 650℃ and the heating time is 78 minutes. The temperature of the second heating section is 750℃ and the heating time is 48 minutes. The temperature of the soaking section is 700℃ and the heating time is 46 minutes. The temperature of the slabs after heating is 638℃. The total heating time in the furnace is 172 minutes.

[0027] Step 2: After the slab exits the preheating furnace, it is placed into the heating furnace according to the set loading sequence and material distribution method, with a loading interval of 8 minutes per slab.

[0028] The preheating section temperature is 850℃, the heating time is 45 minutes, the heating section temperature is 930℃, the heating time is 20 minutes, the soaking section temperature is 920℃, the holding time is 20 minutes, and the furnace exit temperature of the industrial pure titanium slab after heating is 876℃.

[0029] After all the industrial pure titanium slabs were taken out of the furnace, the preheating section temperature was set to 795℃ and the heating time was 40 minutes. The heating section temperature was set to 890℃ and the heating time was 25 minutes. The soaking section temperature was set to 880℃ and the holding time was 20 minutes. After heating, the industrial pure zirconium slab exited the furnace at a temperature of 877℃. The overall heating time of the slab in the furnace was 180 minutes.

[0030] Step three: after the industrial pure titanium slab is discharged, the rolling is started, then the scrap steel slab is discharged and is retreated through the charging roller, the retreat interval is 8 minutes per block, after the retreat, the industrial pure zirconium slab is discharged and is rolled.

[0031] As shown in Figures 2-3 The industrial pure titanium and the industrial pure zirconium prepared by the embodiment 1 of the specific implementation manner of the application have good surface quality smoothness, and no beta phase is found in the microstructure.

[0032] The embodiment 2,

[0033] Step one: the slab is placed into the preheating furnace for heating according to the set charging sequence and the material distribution mode, the charging interval is 8 minutes per block, the temperature of the first heating section of the preheating furnace is 450℃, the heating time is 75 minutes, the temperature of the second heating section is 650℃, the heating time is 45 minutes, the temperature of the soaking section is 650℃, the heating time is 40 minutes, after the heating, the slab discharge temperature is 620℃, and the overall heating time in the furnace is 160 minutes.

[0034] Step two: after the slab is discharged from the preheating furnace, the slab is placed into the heating furnace according to the set charging sequence and the material distribution mode, the charging interval is 8 minutes per block;

[0035] The temperature of the preheating section is 800℃, the heating time is 40 minutes, the temperature of the heating section is 870℃, the heating time is 20 minutes, the temperature of the soaking section is 900℃, and the holding time is 16 minutes, after the heating, the industrial pure titanium plate discharge temperature is 876℃;

[0036] After the industrial pure titanium slab is completely discharged, the temperature of the preheating section is adjusted to 760℃, the heating time is 51 minutes, the temperature of the heating section is adjusted to 830℃, the heating time is 21 minutes, the temperature of the soaking section is adjusted to 860℃, and the holding time is 20 minutes, after the heating, the industrial pure zirconium slab discharge temperature is 877℃, and the overall heating time of the slab in the furnace is 168 minutes.

[0037] Step three: after the industrial pure titanium slab is discharged, the rolling is started, then the scrap steel slab is discharged and is retreated through the charging roller, the retreat interval is 8 minutes per block, after the retreat, the industrial pure zirconium slab is discharged and is rolled.

[0038] The embodiment 3,

[0039] Step one: the slab is placed into the preheating furnace for heating according to the set charging sequence and the material distribution mode, the charging interval is 8 minutes per block, the temperature of the first heating section of the preheating furnace is 680℃, the heating time is 75 minutes, the temperature of the second heating section is 780℃, the heating time is 45 minutes, the temperature of the soaking section is set to 720℃, the heating time is 40 minutes, after the heating, the slab discharge temperature is 720℃, and the overall heating time in the furnace is 160 minutes.

[0040] Step two: after the slab is discharged from the preheating furnace, the slab is placed into the heating furnace according to the set charging sequence and material distribution method, and the charging interval time is 8 minutes per piece;

[0041] The preheating section temperature is 870 DEG C, the heating time is 40 minutes, the heating section temperature is 990 DEG C, the heating time is 20 minutes, the soaking section temperature is set to 940 DEG C, and the holding time is 16 minutes, and the industrial pure titanium slab discharge temperature after heating is 876 DEG C;

[0042] After the industrial pure titanium slab is discharged, the preheating section temperature is adjusted to 830 DEG C, the heating time is 51 minutes, the heating section temperature is adjusted to 950 DEG C, the heating time is 21 minutes, the soaking section temperature is adjusted to 900 DEG C, and the holding time is 20 minutes, and the industrial pure zirconium slab discharge temperature after heating is 877 DEG C, and the overall slab heating time in the furnace is 168 minutes.

[0043] Step three: after the industrial pure titanium slab is discharged, the rolling is started, then the scrap steel slab is discharged and retreated through the charging roller, the retreat interval time is 8 minutes per piece, and after the retreat, the industrial pure zirconium slab is discharged and rolled.

Claims

1. A method of mixed heating of an industrial pure titanium slab and an industrial pure zirconium slab, characterized by: It comprises the following steps: Step one: put the scrap slab between the industrial pure titanium slab and the industrial pure zirconium slab, the slab arrangement is that the industrial pure titanium slab and the industrial pure zirconium slab are arranged in the middle, and the scrap slab is arranged on the left and right, the slab arrangement sequence from the furnace end to the furnace end is the industrial pure titanium slab, the scrap slab and the industrial pure zirconium slab, and then put them into the preheating furnace to heat to 620-650 DEG C and then take out; Step two: put the industrial pure titanium slab, the industrial pure zirconium slab and the scrap slab into the heating furnace, the slab arrangement is that the industrial pure titanium slab and the industrial pure zirconium slab are arranged in the middle, and the scrap slab is arranged on the left and right, the slab arrangement sequence from the furnace end to the furnace end is the industrial pure titanium slab, the scrap slab and the industrial pure zirconium slab, and the heating time is greater than 165 minutes, wherein the preheating time is greater than 90 minutes, the heating time is greater than 40 minutes, and the soaking time is greater than 35 minutes; The heating furnace temperature system is three-stage heating of preheating, heating and soaking, wherein: the industrial pure titanium temperature system is preheating 800-870 DEG C, heating 870-990 DEG C and soaking 900-940 DEG C; the industrial pure zirconium temperature system is preheating 760-830 DEG C, heating 830-950 DEG C and soaking 860-900 DEG C; Step three: take out the industrial pure titanium slab and the industrial pure zirconium slab and roll them, and the scrap slab is returned.

2. The method of claim 1, wherein the industrial pure titanium slab and the industrial pure zirconium slab are mixed and heated. The preheating furnace and the heating furnace are step beam type slab heating furnaces.

3. The method of claim 1, wherein the industrial pure titanium slab and the industrial pure zirconium slab are mixed and heated. In step one, the preheating furnace heating time is greater than or equal to 160 minutes, wherein the first heating time is greater than or equal to 75 minutes, the second heating time is greater than or equal to 45 minutes, and the soaking time is greater than or equal to 40 minutes; the preheating furnace temperature system is three-stage heating of first heating, second heating and soaking, wherein: the first heating is 450-680 DEG C, the second heating is 650-780 DEG C, and the soaking is 650-720 DEG C.

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