Production process for 4J29 alloy cold-rolled strip

Abstract

The invention provides a 4J29 alloy cold-rolled strip production process which comprises the following steps: S1, shot blasting treatment: removing oxide skin on the surface of a 4J29 alloy strip by adopting a method for performing shot blasting on the surface of the 4J29 alloy strip; s2, acid pickling treatment is conducted, specifically, the 4J29 alloy strip obtained after shot blasting treatment is subjected to acid pickling treatment; s3, the 4J29 alloy strip in the step S2 is subjected to rough wire drawing; s4, primary degreasing is conducted, specifically, the 4J29 alloy strip prepared in the S3 is subjected to degreasing treatment; s5, primary cold rolling is conducted, specifically, the 4J29 alloy strip obtained in the step S4 is subjected to cold rolling treatment; s6, primary annealing is conducted, specifically, the 4J29 alloy strip prepared in the step S5 is subjected to annealing treatment; and S7, primary fine wire drawing is conducted, specifically, the 4J29 alloy strip obtained in the step S6 is subjected to fine wire drawing treatment. The problems that the production efficiency is low, the production period is long and the market demand is difficult to meet due to the fact that a surface oxide layer and surface defects of an existing 4J29 alloy material are removed through water milling and dry polishing technologies can be solved.

Description

Technical Field

[0001] The invention belongs to the technical field of alloy cold rolling processing, and in particular relates to a production process of 4J29 alloy cold rolled strip. Background Art

[0002] The existing 4J29 alloy production technology generally uses water grinding and dry polishing technology to remove the surface oxide layer and surface defects. However, using this technology, only the raw material (hot-rolled coil) needs to be water-grinded 3 to 4 times and dry-polished 2 to 3 times before its surface quality can meet the requirements of rough rolling. In addition, multiple dry polishing is required during the production process to ensure that the quality of the finished product meets national standards and customer requirements. Its production efficiency is low, the production cycle is long, and it is difficult to meet market demand; in addition, water grinding and dry polishing equipment are not commonly used in the current metal material rolling process, and it is difficult to obtain processing technology. Summary of the invention

[0003] The purpose of the present invention is to provide a production process for cold-rolled strip of 4J29 alloy in order to solve the problem that the existing 4J29 alloy material adopts water grinding and dry polishing technology to remove surface oxide layer and surface defects, resulting in low production efficiency, long production cycle and difficulty in meeting market demand.

[0004] In order to achieve the above object, the present invention provides a production process of 4J29 alloy cold-rolled strip, which comprises the following steps:

[0005] S1: Shot blasting treatment, using the method of shot blasting the surface of the 4J29 alloy strip to remove the oxide scale on the surface of the 4J29 alloy strip;

[0006] S2: Pickling treatment, pickling the 4J29 alloy strip after shot blasting;

[0007] S3: rough drawing the 4J29 alloy strip in step S2;

[0008] S4: primary degreasing, degreasing the 4J29 alloy strip obtained in step S3;

[0009] S5: primary cold rolling, cold rolling the 4J29 alloy strip obtained in step S4;

[0010] S6: primary annealing, annealing the 4J29 alloy strip obtained in step S5;

[0011] S7: performing a primary fine wire drawing process on the 4J29 alloy strip obtained in step S6;

[0012] S8: secondary cold rolling, cold rolling the 4J29 alloy strip obtained in step S7;

[0013] S9: secondary annealing, annealing the 4J29 alloy strip obtained in step S8;

[0014] S10: secondary fine wire drawing, performing fine wire drawing on the 4J29 alloy strip obtained in step S9;

[0015] S11: cold rolling three times, cold rolling the 4J29 alloy strip obtained in step S10;

[0016] S12: secondary degreasing, degreasing the 4J29 alloy strip obtained in step S11;

[0017] S13: annealing three times, annealing the 4J29 alloy strip obtained in step S12.

[0018] S14: The 4J29 alloy strip obtained in step S13 is straightened and stripped to obtain a finished 4J29 alloy strip.

[0019] As a further description of the above technical solution:

[0020] The polishing silicon carbide abrasive belt for rough drawing in step S3 is 60#80 mesh, and the speed is 4-30m / min.

[0021] As a further description of the above technical solution:

[0022] The polishing and drawing silicon carbide abrasive belt for the primary fine drawing in step S7 and the secondary fine drawing in step S710 is 240#320 mesh, and the speed is 8-30 m / min.

[0023] As a further description of the above technical solution:

[0024] The primary cold rolling in step S5 uses a four-roll rolling mill to perform 6 to 8 passes on the 4J29 alloy strip, and the thickness of the 4J29 alloy strip coil is rolled from 4.0 mm to 1.4 to 1.5 mm.

[0025] As a further description of the above technical solution:

[0026] The secondary cold rolling in step S8 uses a four-roller rolling mill or a twenty-roller precision rolling mill to perform 6 to 8 passes on the 4J29 alloy strip, and the thickness of the 4J29 alloy strip coil is rolled from 1.4 to 1.5 mm to 0.5 to 0.6 mm.

[0027] As a further description of the above technical solution:

[0028] The three cold rolling processes in step S11 are performed by a twenty-roll precision rolling mill on the 4J29 alloy strip for 6 to 8 passes, and the thickness of the 4J29 alloy strip coil is rolled from 0.5 to 0.6 mm to the finished product thickness.

[0029] As a further description of the above technical solution:

[0030] The annealing temperature of the primary annealing in step S6 is 950-1050° C., and the speed is 3-7 m / min.

[0031] As a further description of the above technical solution:

[0032] The annealing temperature of the primary annealing in step S6 and the secondary annealing in step S9 are both 950-1050° C. and the speed is 3-7 m / min.

[0033] As a further description of the above technical solution:

[0034] The annealing temperature of the three annealings in step S13 is 900-1000° C. and the speed is 5-10 m / min.

[0035] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0036] 1. The present invention uses shot blasting + pickling process instead of alkali explosion + pickling, which improves production efficiency and reduces production cost.

[0037] 2. The present invention uses one double-sided rough drawing to replace 3-4 water grinding and 2-3 dry polishing to remove the residual surface oxide layer and surface defects. The removal rate of oxide layer and surface defects is better than that of water grinding and dry polishing, which greatly reduces the workload of manual grinding. At the same time, two fine drawing replaces multiple dry polishing in the process to achieve the purpose of removing the process oxide layer and surface defects. Thereby improving production efficiency and shortening production cycle.

[0038] 3. The present invention eliminates wire drawing marks and ensures the surface quality of the coil by controlling the rolling reduction and using different types of rollers to meet standard requirements and customer usage requirements.

[0039] 4. According to the characteristics and performance requirements of 4J29 combined with the annealing process of other metal materials, continuous production can be achieved without major adjustments during the production process. The performance and technical indicators of the finished products meet the standard requirements and meet the customer's usage requirements. The production equipment modification is small and the cost is low. DETAILED DESCRIPTION

[0040] The preferred embodiments of the present invention will be described in detail below.

[0041] Embodiment 1:

[0042] The present invention provides a production process of 4J29 alloy cold-rolled strip, comprising the following steps:

[0043] S1: Shot blasting treatment, using the method of shot blasting the surface of the 4J29 alloy strip to remove the oxide scale on the surface of the 4J29 alloy strip;

[0044] S2: Pickling treatment, pickling the 4J29 alloy strip after shot blasting;

[0045] S3: rough drawing the 4J29 alloy strip in step S2;

[0046] S4: primary degreasing, degreasing the 4J29 alloy strip obtained in step S3;

[0047] S5: primary cold rolling, cold rolling the 4J29 alloy strip obtained in step S4;

[0048] S6: primary annealing, annealing the 4J29 alloy strip obtained in step S5;

[0049] S7: performing a primary fine wire drawing process on the 4J29 alloy strip obtained in step S6;

[0050] S8: secondary cold rolling, cold rolling the 4J29 alloy strip obtained in step S7;

[0051] S9: secondary annealing, annealing the 4J29 alloy strip obtained in step S8;

[0052] S10: secondary fine wire drawing, performing fine wire drawing on the 4J29 alloy strip obtained in step S9;

[0053] S11: cold rolling three times, cold rolling the 4J29 alloy strip obtained in step S10;

[0054] S12: secondary degreasing, degreasing the 4J29 alloy strip obtained in step S11;

[0055] S13: annealing three times, annealing the 4J29 alloy strip obtained in step S12.

[0056] S14: The 4J29 alloy strip obtained in step S13 is straightened and stripped to obtain a finished 4J29 alloy strip.

[0057] Testing method and standard: The reflectivity of the surface of the polished 4J29 alloy sample was tested by a UV-240 ultraviolet-visible spectrophotometer (wavelength 750nm), and a mirror with a reflectivity of 100% was used as a reference. The reflectivity of the surface of the 4J29 alloy strip sample in this embodiment was greater than 93.1%, and the polishing effect was excellent; at the same time, the surface of the 4J29 alloy was polished evenly, without dust, without local over-corrosion, and the residual slight mechanical lines and trace oil could be eliminated.

[0058] The polishing silicon carbide abrasive belt for rough drawing in step S3 is 60#80 mesh, and the speed is 4-30m / min.

[0059] The polishing and drawing silicon carbide abrasive belt for the primary fine drawing in step S7 and the secondary fine drawing in step S710 is 240#320 mesh, and the speed is 8-30 m / min.

[0060] When drawing wire, cutting fluid is also used to improve the drawing quality. The concentration of cutting fluid is 4% to 5%.

[0061] The primary cold rolling in step S5 uses a four-roll rolling mill to perform 6 to 8 passes on the 4J29 alloy strip, and the thickness of the 4J29 alloy strip coil is rolled from 4.0 mm to 1.4 to 1.5 mm.

[0062] The secondary cold rolling in step S8 uses a four-roller rolling mill or a twenty-roller precision rolling mill to perform 6 to 8 passes on the 4J29 alloy strip, and the thickness of the 4J29 alloy strip coil is rolled from 1.4 to 1.5 mm to 0.5 to 0.6 mm.

[0063] The three cold rolling processes in step S11 are performed by a twenty-roll precision rolling mill on the 4J29 alloy strip for 6 to 8 passes, and the thickness of the 4J29 alloy strip coil is rolled from 0.5 to 0.6 mm to the finished product thickness.

[0064] By using different types of rollers and allocating reasonable pass reduction in each pass, the filamentary marks formed on the surface of the strip coil during the wire drawing process can be eliminated to achieve the surface quality requirements of semi-finished products and finished products.

[0065] The annealing temperature of the primary annealing in step S6 is 950-1050° C., and the speed is 3-7 m / min.

[0066] The annealing temperature of the primary annealing in step S6 and the secondary annealing in step S9 are both 950-1050° C. and the speed is 3-7 m / min.

[0067] The annealing temperature of the three annealings in step S13 is 900-1000° C. and the speed is 5-10 m / min.

[0068] Annealing can be performed multiple times to improve the performance of the finished product. During annealing, a 1:2 mixture of hydrogen and argon is used as a protective gas for special annealing. Hydrogen can improve the structure of the 4J29 alloy, thereby reducing its degree of work hardening. Argon can prevent oxidation. Through three conventional annealings, the stress inside the cold-rolled strip is eliminated, so that the performance of the 4J29 alloy strip is not affected after cold rolling, and the use of nitrogen is reduced.

[0069] Embodiment 2:

[0070] The present invention provides a production process of 4J29 alloy cold-rolled strip, comprising the following steps:

[0071] S1: Shot blasting treatment, using the method of shot blasting the surface of the 4J29 alloy strip to remove the oxide scale on the surface of the 4J29 alloy strip;

[0072] S2: Pickling treatment, pickling the 4J29 alloy strip after shot blasting;

[0073] S3: rough drawing the 4J29 alloy strip in step S2;

[0074] S4: primary degreasing, degreasing the 4J29 alloy strip obtained in step S3;

[0075] S5: primary cold rolling, cold rolling the 4J29 alloy strip obtained in step S4;

[0076] S6: primary annealing, annealing the 4J29 alloy strip obtained in step S5;

[0077] S7: performing a primary fine wire drawing process on the 4J29 alloy strip obtained in step S6;

[0078] S8: secondary cold rolling, cold rolling the 4J29 alloy strip obtained in step S7;

[0079] S9: secondary annealing, annealing the 4J29 alloy strip obtained in step S8;

[0080] S10: cold rolling three times, cold rolling the 4J29 alloy strip obtained in step S10;

[0081] S11: secondary degreasing, degreasing the 4J29 alloy strip obtained in step S11;

[0082] S12: annealing three times, annealing the 4J29 alloy strip obtained in step S12.

[0083] S13: The 4J29 alloy strip obtained in step S13 is straightened and stripped to obtain a finished 4J29 alloy strip.

[0084] Embodiment 2 provides a production process of 4J29 alloy cold-rolled strip, which is basically the same as Embodiment 1, except that there is no second fine wire drawing.

[0085] Testing method and standard: The reflectivity of the surface of the polished 4J29 alloy sample was tested by a UV-240 ultraviolet-visible spectrophotometer (wavelength 750nm), and a mirror with a reflectivity of 100% was used as a reference. The reflectivity of the surface of the 4J29 alloy strip sample in this embodiment was greater than 91.1%, and the polishing effect was excellent; at the same time, the surface of the 4J29 alloy was polished evenly, without dust, without local over-corrosion, and the residual slight mechanical lines and trace oil could be eliminated.

[0086] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0087] 1. The present invention uses shot blasting + pickling process instead of alkali explosion + pickling, which improves production efficiency and reduces production cost.

[0088] 2. The present invention uses one double-sided rough drawing to replace 3-4 water grinding and 2-3 dry polishing to remove the residual surface oxide layer and surface defects. The removal rate of oxide layer and surface defects is better than that of water grinding and dry polishing, which greatly reduces the workload of manual grinding. At the same time, two fine drawing replaces multiple dry polishing in the process to achieve the purpose of removing the process oxide layer and surface defects. Thereby improving production efficiency and shortening production cycle.

[0089] 3. The present invention eliminates wire drawing marks and ensures the surface quality of the coil by controlling the rolling reduction and using different types of rollers to meet standard requirements and customer usage requirements.

[0090] 4. According to the characteristics and performance requirements of 4J29 combined with the annealing process of other metal materials, continuous production can be achieved without major adjustments during the production process. The performance and technical indicators of the finished products meet the standard requirements and meet the customer's usage requirements. The production equipment modification is small and the cost is low.

[0091] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A process for producing 4J29 alloy cold-rolled strip, characterized in that: The following steps are involved: S1: Shot blasting treatment, using the method of shot blasting the surface of the 4J29 alloy strip to remove the oxide scale on the surface of the 4J29 alloy strip; S2: pickling treatment, pickling the 4J29 alloy strip after shot blasting; S3: rough drawing the 4J29 alloy strip in step S2; S4: primary degreasing, degreasing the 4J29 alloy strip obtained in step S3; S5: primary cold rolling, cold rolling the 4J29 alloy strip obtained in step S4; S6: primary annealing, annealing the 4J29 alloy strip obtained in step S5; S7: performing a primary fine wire drawing process on the 4J29 alloy strip obtained in step S6; S8: secondary cold rolling, cold rolling the 4J29 alloy strip obtained in step S7; S9: secondary annealing, annealing the 4J29 alloy strip obtained in step S8; S10: secondary fine wire drawing, performing fine wire drawing on the 4J29 alloy strip obtained in step S9; S11: cold rolling three times, cold rolling the 4J29 alloy strip obtained in step S10; S12: secondary degreasing, degreasing the 4J29 alloy strip obtained in step S11; S13: annealing three times, annealing the 4J29 alloy strip obtained in step S12. S14: The 4J29 alloy strip obtained in step S13 is straightened and stripped to obtain a finished 4J29 alloy strip.

2. A process for producing 4J29 alloy cold-rolled strip according to claim 1, characterized in that: The polishing silicon carbide abrasive belt for rough drawing in step S3 is 60#80 mesh, and the speed is 4-30m / min.

3. A process for producing 4J29 alloy cold-rolled strip according to claim 1, characterized in that: The polishing and drawing silicon carbide abrasive belt for the primary fine drawing in step S7 and the secondary fine drawing in step S710 is 240#320 mesh, and the speed is 8-30 m / min.

4. A process for producing 4J29 alloy cold-rolled strip according to claim 1, characterized in that: The primary cold rolling in step S5 uses a four-roll rolling mill to perform 6 to 8 passes on the 4J29 alloy strip, and the thickness of the 4J29 alloy strip coil is rolled from 4.0 mm to 1.4 to 1.5 mm.

5. A process for producing 4J29 alloy cold-rolled strip according to claim 1, characterized in that: The secondary cold rolling in step S8 uses a four-roller rolling mill or a twenty-roller precision rolling mill to perform 6 to 8 passes on the 4J29 alloy strip, and the thickness of the 4J29 alloy strip coil is rolled from 1.4 to 1.5 mm to 0.5 to 0.6 mm.

6. A process for producing 4J29 alloy cold-rolled strip according to claim 1, characterized in that: The three cold rolling processes in step S11 are performed by a twenty-roll precision rolling mill on the 4J29 alloy strip for 6 to 8 passes, and the thickness of the 4J29 alloy strip coil is rolled from 0.5 to 0.6 mm to the finished product thickness.

7. A process for producing 4J29 alloy cold-rolled strip according to claim 1, characterized in that: The annealing temperature of the primary annealing in step S6 is 950-1050° C., and the speed is 3-7 m / min.

8. A process for producing 4J29 alloy cold-rolled strip according to claim 1, characterized in that: The annealing temperatures of the primary annealing in step S6 and the secondary annealing in step S9 are both 950-1050° C. and the speeds are 3-7 m / min.

9. A process for producing 4J29 alloy cold-rolled strip according to claim 1, characterized in that: The annealing temperature of the three annealings in step S13 is 900-1000° C. and the speed is 5-10 m / min.