A method for heating and rolling titanium plate

Abstract

The present invention relates to the field of metal material processing, and in particular to a method for heating and rolling titanium plates, which is used for rolling titanium plates on a plate rolling production line with two heating furnaces. Before the first heating furnace and the second heating furnace are overhauled, the first heating furnace is stopped from being loaded with steel billets to be rolled, and the preheating section and the heating section of the first heating furnace are closed; the steel billets to be rolled are loaded into the second heating furnace; cold steel billets and titanium billets are loaded into the first heating furnace in sequence; after the steel billets to be rolled in the second heating furnace are rolled, the cold steel billets in the first heating furnace are returned to the furnace, and the titanium billets in the first heating furnace are rolled. The innovative furnace loading method of this scheme rationally utilizes the heating and cooling time before the overhaul of the first heating furnace and the second heating furnace to heat the billets, reduces the waste of coal gas and the impact on the production process, and thus improves the rolling efficiency.

Description

Technical Field

[0001] The invention relates to the field of metal material processing, in particular to a method for heating and rolling a titanium plate. Background Art

[0002] The metal blank is passed through the gap between a pair of rotating rollers (various shapes). Due to the compression of the rollers, the cross-section of the material is reduced and the length is increased. This is the most commonly used production method for steel, mainly used to produce profiles, plates, and pipes. There are two types: hot rolling and cold rolling.

[0003] For conventional plate rolling production lines with two heating furnaces, since the heating temperature of the titanium plate is about 300°C lower than that of the steel billet, if the titanium billet is rolled after the steel billet is rolled, it takes time to lower the furnace temperature of the heating furnace. If the steel billet is rolled after the titanium plate is rolled, it takes time to increase the furnace temperature of the heating furnace. There are some problems with the existing heating mode, such as: the heating furnace takes a long time to heat up and down, which increases additional gas consumption and reduces production efficiency; after the titanium plate is rolled, the subsequent heating time of the steel billet is insufficient, affecting the normal production rhythm; due to the low rolling temperature of the titanium plate and the rapid temperature drop, thick titanium billets need to be rolled using two fires, which consumes more manpower and material resources and also reduces production efficiency. Due to the difference in physical properties between titanium plates and steel plates, there will be problems if the conventional billet rolling mode is used to roll titanium plates. For example, due to the large temperature difference between the edge and the center of the titanium plate, inconsistent deformation amount and deformation rate, etc., narrow cracks are easily generated at the edge of the titanium plate; the rolling temperature of the titanium plate is relatively low. In order to ensure the starting rolling temperature during the first-fire rolling process, high-pressure water is not used during the rolling process, resulting in titanium plate debris sticking and pressing in, resulting in poor surface quality of the titanium plate. Summary of the invention

[0004] In view of the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide a titanium plate heating rolling method for solving the problem of low rolling efficiency caused by unreasonable heating mode during the rolling process of steel billets and titanium billets in the prior art.

[0005] To achieve the above-mentioned purpose and other related purposes, the present invention provides a titanium plate heating rolling method, which is used for rolling titanium plates on a plate rolling production line with two heating furnaces, wherein the two heating furnaces include a first heating furnace and a second heating furnace, wherein the first heating furnace and the second heating furnace are both provided with a preheating section, a heating section and a soaking section, wherein the heating section includes a first heating section and a second heating section, and comprises:

[0006] Before the first heating furnace and the second heating furnace are overhauled, the billets to be rolled are stopped from being loaded into the first heating furnace, and the preheating section and the heating section of the first heating furnace are closed;

[0007] Loading the steel billet to be rolled into the second heating furnace;

[0008] The cold steel billet and the titanium billet are successively loaded into the first heating furnace and heated;

[0009] After the steel billet to be rolled in the second heating furnace is rolled, the cold steel billet in the first heating furnace is returned to the furnace, and then the titanium billet in the first heating furnace is rolled.

[0010] Optionally, the oxygen content in the first heating furnace and the second heating furnace is 2% to 5%.

[0011] Optionally, the heating temperature of the preheating section is 480° C. to 500° C., and the heating time of the preheating section is 35 minutes to 40 minutes.

[0012] Optionally, the heating temperature of the heating stage is 860° C. to 900° C., and the heating time of the heating stage is 50 minutes to 60 minutes.

[0013] Optionally, the heating temperature of the second heating stage is 910° C. to 930° C., and the heating time of the second heating stage is 60 minutes to 70 minutes.

[0014] Optionally, the heating temperature of the soaking section is 890° C. to 920° C., and the heating time of the soaking section is 60 to 70 minutes.

[0015] Optionally, the titanium plate rolling process includes a rough rolling pass and a finishing rolling pass, and the starting rolling temperature of the rough rolling is 770°C to 820°C.

[0016] Optionally, the start rolling temperature of the finish rolling is 720°C to 780°C.

[0017] Optionally, the rolling reduction ratio of the finishing pass is below 25%, and the rolling reduction ratio of the roughing pass is below 30%.

[0018] Optionally, before the titanium billet is rolled, the surface of the titanium billet is purged.

[0019] As described above, the titanium plate heating rolling method of the present invention has the following beneficial effects:

[0020] This scheme rolls the titanium billet before the overhaul of the first heating furnace and the second heating furnace. First, stop loading the billet to be rolled into the first heating furnace, and close the preheating section and the heating section of the first heating furnace to reduce the temperature in the first heating furnace. Cold billets and titanium billets for absorbing heat are successively loaded into the first heating furnace. After the first heating furnace is loaded with the titanium billet, the billet to be rolled is loaded into the second heating furnace. Using the cooling time of the first heating furnace, the second heating furnace rolls the billet to be rolled. After the billet to be rolled in the second heating furnace is rolled, the cold billet in the first heating furnace is returned to the furnace, and then the titanium billet in the first heating furnace is rolled. The innovative furnace loading method of this scheme rationally utilizes the heating and cooling time before the overhaul of the first and second heating furnaces to heat the billet, reduces the waste of coal gas and the impact on the production process, thereby improving the rolling efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a flow chart of an embodiment of the present invention;

[0022] Figure 2 Schematic diagram of a flow chart of an embodiment of the present invention.

[0023] Part Number Description

[0024] 1- Second heating furnace; 2- First heating furnace; 3- Steel billet to be rolled after planned maintenance; 4- Titanium billet; 5- Cold billet; 6- Steel billet to be rolled before planned maintenance. DETAILED DESCRIPTION

[0025] The following describes the embodiments of the present invention through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention.

[0026] It should be noted that the diagram provided in the present embodiment only illustrates the basic concept of the present invention in a schematic manner, so the diagram only shows the components related to the present invention rather than drawing according to the number, shape and size of the components during actual implementation. The type, quantity and ratio of each component during actual implementation can be a random change, and the component layout type may also be more complicated. The structure, ratio, size, etc. illustrated in the drawings of the present specification are only used to match the content disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions that the present invention can implement, so they have no technical substantive significance. Any modification of the structure, change of the proportional relationship or adjustment of the size should still fall within the scope of the technical content disclosed by the present invention without affecting the effect that the present invention can produce and the purpose that can be achieved. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of narration, and are not used to limit the scope of the present invention. The change or adjustment of its relative relationship should also be regarded as the scope of the present invention without substantially changing the technical content.

[0027] See also Figure 1 and Figure 2 The present embodiment provides a titanium plate heating and rolling method, which is used for rolling titanium plates on a plate rolling production line with two heating furnaces, wherein the two heating furnaces include a first heating furnace and a second heating furnace, wherein the first heating furnace and the second heating furnace are both provided with a preheating section, a heating section and a soaking section, wherein the heating section includes a first heating section and a second heating section, wherein the first heating furnace and the second heating furnace are both step-beam heating furnaces, and the heating process adopts single-fire heating. The titanium plate heating and rolling method includes: before daily maintenance and roll replacement of the first heating furnace and the second heating furnace, when the amount of steel billets to be rolled before the planned maintenance is about 40 minutes, that is, when the amount of steel billets to be rolled is 20 pieces, Stop loading steel billets into the first heating furnace, and close the preheating section and the heating section of the first heating furnace; load the steel billets to be rolled before the planned overhaul into the second heating furnace; load cold steel billets and titanium billets into the first heating furnace in sequence and heat them. There are two cold steel billets for absorbing heat; load the steel billets to be rolled after the planned overhaul behind the titanium billets in the first heating furnace and behind the steel billets to be rolled before the planned overhaul in the second heating furnace; roll the steel billets to be rolled before the planned overhaul loaded in the second heating furnace; after the rolling of the steel billets to be rolled before the planned overhaul in the second heating furnace is completed, return the cold steel billets in the first heating furnace to the furnace, and then roll the titanium billets in the first heating furnace.

[0028] This embodiment is a one-fire forming, innovative furnace loading method, rationally utilizes the temperature rise and fall time of the first heating furnace and the second heating furnace before maintenance to heat the blank, reduces the waste of gas and the impact on the production process, thereby improving the rolling efficiency. This embodiment does not use high-pressure descaling water, closes the cold water outside the roller, reduces the temperature drop rate of the titanium plate, and strives for more rolling processing time. Reduce the impact of titanium plate production on the conventional steel plate production process, reduce the width and depth of the slit at the edge of the titanium plate, and improve the surface quality of the titanium plate.

[0029] In one embodiment, the oxygen content in the first heating furnace and the second heating furnace is 2% to 5%.

[0030] In one embodiment, the heating temperature of the preheating section is 480° C. to 500° C., and the heating time of the preheating section is 35 minutes to 40 minutes. The preheating section of the first heating furnace and the preheating section of the second heating furnace are both heated before rolling.

[0031] In one embodiment, the heating temperature of the heating stage is 860° C. to 900° C., and the heating time of the heating stage is 50 minutes to 60 minutes. The heating stage of the first heating furnace and the heating stage of the second heating furnace are both heated before rolling.

[0032] In one embodiment, the heating temperature of the second heating stage is 910° C. to 930° C., and the heating time of the second heating stage is 60 minutes to 70 minutes. The second heating stage of the first heating furnace and the second heating stage of the second heating furnace are both heated before rolling.

[0033] In one embodiment, the heating temperature of the soaking section is 890° C. to 920° C., and the heating time of the soaking section is 60 to 70 minutes. The soaking section of the first heating furnace and the soaking section of the second heating furnace are both heated before rolling.

[0034] In one embodiment, the titanium plate rolling process includes a rough rolling pass and a finishing rolling pass, and the rough rolling start temperature is 770° C. to 820° C. Reasonable start rolling temperature can ensure good shape and performance of the titanium plate, reduce the width and depth of the slit at the edge of the titanium billet, and meet the needs of subsequent further processing of the titanium billet.

[0035] In one embodiment, the start rolling temperature of the finish rolling is 720° C. to 780° C. Reasonable start rolling temperature can ensure good shape and performance of the titanium billet, reduce the width and depth of the slit at the edge of the titanium billet, and meet the needs of subsequent further processing of the titanium billet.

[0036] In one embodiment, the rolling reduction rate of the finishing rolling pass is less than 25%, and the rolling reduction rate of the rough rolling pass is less than 30%. Reasonable restrictions on the pass reduction rate can ensure good plate shape and performance of the titanium billet, reduce the width and depth of the slit at the edge of the titanium billet, and meet the needs of subsequent further processing of the titanium billet.

[0037] In one embodiment, before the titanium billet is rolled, that is, before the titanium billet is bitten, the surface of the titanium billet is purged, and the oxide scale on the surface of the titanium plate is purged between passes to reduce the pressure of flying chips of the titanium plate and improve the surface quality of the titanium plate.

[0038] In one embodiment, the total furnace time of the first heating furnace and the second heating furnace is more than 220 minutes.

[0039] As described above, the titanium plate heating rolling method of this embodiment has the following beneficial effects:

[0040] This scheme rolls the titanium billet before the overhaul of the first heating furnace and the second heating furnace. First, stop loading the billet to be rolled into the first heating furnace, and close the preheating section and the heating section of the first heating furnace to reduce the temperature in the first heating furnace. After loading the billet to be rolled into the second heating furnace, the cold billet and the titanium billet for absorbing heat are successively loaded into the first heating furnace. Using the cooling time of the first heating furnace, the second heating furnace rolls the billet to be rolled. After the billet to be rolled in the second heating furnace is rolled, the cold billet in the first heating furnace is returned to the furnace, and then the titanium billet in the first heating furnace is rolled. The innovative loading method of this scheme rationally utilizes the heating and cooling time before the overhaul of the first and second heating furnaces to heat the billet, reduces the waste of coal gas and the impact on the production process, thereby improving the rolling efficiency.

[0041] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A titanium plate heating and rolling method, used for rolling titanium plates on a plate rolling production line with two heating furnaces, the two heating furnaces include a first heating furnace and a second heating furnace, the first heating furnace and the second heating furnace are both provided with a preheating section, a heating section and a soaking section, the heating section includes a first heating section and a second heating section, characterized in that: include: Before the first heating furnace and the second heating furnace are overhauled, the billets to be rolled are stopped from being loaded into the first heating furnace, and the preheating section and the heating section of the first heating furnace are closed; Loading the steel billet to be rolled into the second heating furnace; The cold steel billet and the titanium billet are successively loaded into the first heating furnace and heated; After the steel billet to be rolled in the second heating furnace is rolled, the cold steel billet in the first heating furnace is returned to the furnace, and then the titanium billet in the first heating furnace is rolled.

2. The method for hot rolling of titanium sheet according to claim 1, characterized in that: The oxygen content in the first heating furnace and the second heating furnace is 2% to 5%.

3. The method for hot rolling of titanium sheet according to claim 1, characterized in that: The heating temperature of the preheating section is 480° C. to 500° C., and the heating time of the preheating section is 35 minutes to 40 minutes.

4. The method for hot rolling of titanium sheet according to claim 1, characterized in that: The heating temperature of the heating stage is 860° C. to 900° C., and the heating time of the heating stage is 50 minutes to 60 minutes.

5. The method for hot rolling of titanium sheet according to claim 1, characterized in that: The heating temperature of the second heating stage is 910° C. to 930° C., and the heating time of the second heating stage is 60 minutes to 70 minutes.

6. The method for hot rolling of titanium sheet according to claim 1, characterized in that: The heating temperature of the soaking section is 890° C. to 920° C., and the heating time of the soaking section is 60 to 70 minutes.

7. The method for hot rolling a titanium plate according to any one of claims 1 to 6, characterized in that: The titanium plate rolling process includes a rough rolling pass and a finishing rolling pass, and the starting rolling temperature of the rough rolling is 770°C to 820°C.

8. The method for hot rolling of titanium sheet according to claim 7, characterized in that: The start rolling temperature of the finish rolling is 720°C to 780°C.

9. The method for hot rolling of titanium sheet according to claim 7, characterized in that: The rolling reduction rate of the finishing rolling pass is below 25%, and the rolling reduction rate of the rough rolling pass is below 30%.

10. The titanium plate hot rolling method according to any one of claims 1 to 6, characterized in that: Before the titanium billet is rolled, the surface of the titanium billet is purged.

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