CN113981308B - Preparation method of 8K mirror plate manganese-nitrogen series nickel-saving austenitic stainless steel - Google Patents
Preparation method of 8K mirror plate manganese-nitrogen series nickel-saving austenitic stainless steel Download PDFInfo
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Abstract
The invention discloses 8K mirror surface plate manganese-nitrogen series nickel-saving austenitic stainless steel, and relates to the technical field of stainless steel. The austenitic stainless steel of the present invention contains, in mass%, 0.15% or less of C, 0.45% or less of Si, 10% or less of Mn, and P: 0.055% or less, S: 0.003% or less, N: less than 0.16%, Cr 12-18%, Ni 1.00-3.00%, Cu 0.2-2% and Fe for the rest. Meanwhile, the invention also provides a preparation method of the 8K mirror plate manganese-nitrogen series nickel austenitic stainless steel. By controlling the components and the preparation process of the austenitic stainless steel, the white skin roll with a lower Ra value (Ra is less than or equal to 2.8 mu m) can be obtained, the surface of the white skin roll is uniform, the defects of secondary peeling, heat cracking and the like do not exist, and the production rate and the surface quality of the subsequent mirror surface plate finish machining grinding can be effectively improved.
Description
Technical Field
The invention relates to the technical field of stainless steel, in particular to 8K mirror panel manganese-nitrogen series nickel austenitic stainless steel and a preparation method thereof.
Background
The manganese-nitrogen series nickel-saving austenitic stainless steel has good corrosion resistance, certain formability, better coloring capacity and cost price advantage, so that the manganese-nitrogen series nickel-saving austenitic stainless steel has increasingly attracted attention in the field of decorative panel application in recent years. Particularly, as the living standard of people is improved, the requirements of high-end board products such as 8k mirror boards, color plates and the like are more and more increased. Generally, a stainless steel hot-rolled steel coil is adopted, and the surface is uniform and bright like a mirror surface through the procedures of cold rolling, polishing, grinding and color plating.
However, the manganese-nitrogen series nickel-saving austenitic stainless steel serving as the mirror surface plate production raw material has great influence on the subsequent plate surface quality and the grinding production rate, and the high production efficiency and the yield of the subsequent mirror surface finish machining can be effectively improved only by ensuring that the plate surface of the hot-rolled steel coil has no obvious defects, is uniform and has low roughness.
At present, in the prior art, the conventional process technology for producing the mirror surface plate adopts the conventional processes of smelting, pressing and the like, and the white-skin roll produced by the process still has high roughness, so that the uniformity of the mirror surface plate produced by the white-skin roll is still poor, the mirror surface effect of the mirror surface plate is influenced, the yield is low, the quality of the mirror surface plate is unstable, and in order to ensure the surface quality of the mirror surface plate, the production efficiency is reduced by generally reducing the grinding production speed, increasing the grinding channel and the like.
Disclosure of Invention
The invention provides 8K mirror surface plate manganese-nitrogen series nickel-saving austenitic stainless steel and a preparation method thereof, aiming at solving the content in the background technology.
In order to achieve the technical purpose, the invention mainly adopts the following technical scheme:
an 8K mirror plate manganese-nitrogen series nickel-containing austenitic stainless steel comprises, by mass, 0.15% or less of C, 0.45% or less of Si, 10% or less of Mn, and P: 0.055% or less, S: 0.003% or less, N: less than 0.16%, 12-18% of Cr, 1.00-3.00% of Ni, 0.2-2% of Cu and the balance of Fe.
Preferably, the 8K mirror plate manganese-nitrogen-bonded nickel austenitic stainless steel comprises the following components in percentage by mass: 0.075-0.143% of C, 0.353-0.403% of Si, 8.109-9.032% of Mn, P: 0.042% -0.05%, S: 0.0006% -0.00139%, N: 0.1443-0.153%, Cr 14.5-14.768%, Ni 1.195-1.202%, Cu 0.252-0.809% and Fe the rest.
The invention also provides a preparation method of the 8K mirror plate manganese-nitrogen series nickel austenitic stainless steel, which comprises the following steps:
s1, smelting and continuously casting the raw materials of the austenitic stainless steel into a steel billet;
and S2, sequentially rolling, annealing, pickling, detecting surface roughness, cold rolling and finishing and grinding the obtained steel billet.
Preferably, in the step S1, the refining time during the smelting of the austenitic stainless steel liquid is 10 minutes or more.
Preferably, in the step S1, the continuous casting is performed in a heating furnace, the heating furnace includes a preheating section and a heating section, which are connected in sequence, the temperature of the preheating section is 700 to 900 ℃, the temperature of the heating section is 1150 to 1300 ℃, and the continuous casting speed is 0.9 to 1.3 m/min.
Furthermore, the heating interval comprises a first heating interval, a second heating interval and a soaking section which are sequentially communicated with one another, wherein the temperature of the soaking section is 8-30 ℃ higher than that of the second heating interval, and the temperature of the second heating interval is 90-100 ℃ higher than that of the first heating interval.
In the preparation method, preferably, in the step S2, shot blasting and re-brushing processes are sequentially performed between the annealing and the acid washing, wherein the shot blasting speed is 800-1400 r/min, the re-brushing speed is 600-1200 rpm, and the reduction is 2-4 mm.
Further, the acid cleaning adopts a sulfuric acid and 4-section mixed acid cleaning process, and the mixed acid is a mixture of nitric acid and hydrofluoric acid.
Furthermore, the concentration of the sulfuric acid is 190g/L, the concentration of the nitric acid in the 1-stage acid mixing zone is 60-70g/L, and the concentration of the hydrofluoric acid is 4.0-4.5 g/L; the concentration of nitric acid in the 2-stage acid mixing zone is 65-75g/L, and the concentration of hydrofluoric acid is 0.5-1.5 g/L; the concentration of nitric acid in the acid mixing area at the 3-stage is 40-50g/L, and the concentration of hydrofluoric acid is 0.6-1.1 g/L; the concentration of nitric acid in the acid mixing area of 4 sections is 40-50g/L, and the concentration of hydrofluoric acid is 0.2-0.7 g/L.
In addition, the white leather roll with a uniform plate surface is obtained after annealing and acid washing, and Ra is less than or equal to 2.8 mu m when the surface roughness of the white leather roll is detected.
Compared with the prior art, the invention mainly has the following beneficial effects: by controlling the components and the preparation process of the austenitic stainless steel, the white skin roll with a lower Ra value (Ra is less than or equal to 2.8 mu m) can be obtained, the surface of the white skin roll is uniform, the defects of secondary peeling, heat cracking and the like do not exist, and the production rate and the surface quality of the subsequent mirror surface plate finish machining grinding can be effectively improved.
Detailed Description
The present invention is further illustrated by the following specific examples. The specific examples are intended to illustrate the invention in further detail, and are not intended to limit the scope of the invention.
Example 1
The 8K mirror plate manganese-nitrogen series nickel austenitic stainless steel comprises the following components:
0.143% of C, Si: 0.403%, Mn: 8.109%, P: 0.042%, S: 0.0006%, Cr: 14.5%, Ni: 1.195%, Cu: 0.252%, N: 0.153% and balance Fe.
The method for preparing the 8K mirror panel by adopting the components comprises the following steps:
1. smelting the raw materials of the austenitic stainless steel for 13min, casting the raw materials into a steel billet in a heating furnace, wherein the feeding temperature of the continuously cast steel billet is 358 ℃, the temperature of the continuously cast steel billet passing through a preheating interval is 859 ℃, the temperature of the first heating interval is 1172 ℃, the temperature of the second heating interval is 1269 ℃, and the temperature of a soaking section is 1293 ℃.
2. And (3) rolling the obtained steel billet by hot rolling and finish rolling in sequence, wherein in the hot rolling and the finish rolling, a roller rolls a number of 32 coils, and after the finish rolling, laminar cooling is adopted to reach 668 ℃ to obtain a hot-rolled black skin coil.
3. Hot acid annealing and pickling, surface roughness detection, cold rolling and finish machining and grinding.
4. Annealing the hot-rolled black sheet coil, discharging the hot-rolled black sheet coil from a furnace at the temperature of 1172 ℃, removing most of oxidized embroidery skin by straightening, shot blasting and sand blasting, wherein shot blasting is performed for four times, the shot blasting speed of No. 1 and No. 2 is 1000r/min, and a steel shot S110; shot blasting rotation speeds of 3# and 4# are 1200r/min, and steel shots S110+ S70 are obtained; then, the surface was roughly ground by a heavy brush at 900rpm with a rolling reduction of 3.0 mm.
5. And (3) pickling the hot-rolled black coil subjected to shot blasting, wherein the pickling is carried out by adopting a sulfuric acid + 4-stage mixed acid (nitric acid + hydrofluoric acid) pickling process. The concentration of sulfuric acid is 183g/l, the concentration of nitric acid in the 1-stage acid mixing area is 62g/l, and the concentration of hydrofluoric acid is 4.4 g/l; the concentration of nitric acid in the 2-stage acid mixing region is 73g/l, and the concentration of hydrofluoric acid is 1.1 g/l; the concentration of nitric acid in the acid mixing area at the 3 sections is 48g/l, and the concentration of hydrofluoric acid is 0.9 g/l; the concentration of nitric acid in the acid mixing area of 4 sections is 42g/l, and the concentration of hydrofluoric acid is 0.4 g/l.
6. After the acid washing in step 5, a white roll having a uniform surface and a thickness of 2.2mm was obtained, and the roughness Ra was 1.86 and the RZ1max was 17.11 (the detection wavelength λ was 2.5 μm).
7. The white coil is processed by a cold rolling mill to obtain a plate surface with the thickness of 0.75mm & lt 2 & gt 2B & lt, the finish machining grinding average production speed is 4.5m/min, the plate surface quality is uniform, and the requirements of a finish 8K mirror surface plate are met.
Example 2
The 8K mirror plate manganese-nitrogen series nickel austenitic stainless steel comprises the following components:
0.075% of C, Si: 0.353%, Mn: 9.032%, P: 0.05%, S: 0.00139%, Cr: 14.768%, Ni: 1.202%, Cu: 0.809%, N: 0.1443% and the balance Fe.
The method for preparing the 8K mirror panel by adopting the components comprises the following steps:
1. smelting the raw materials of the austenitic stainless steel with the components for 15min, casting the raw materials into a steel billet in a heating furnace, wherein the feeding temperature of the continuously cast steel billet is 479 ℃, the temperature of the continuously cast steel billet passing through a preheating interval is 843 ℃, the temperature of a first heating interval is 1168 ℃, the temperature of a second heating interval is 1264 ℃, and the temperature of a soaking section is 1272 ℃.
2. And (3) sequentially carrying out hot rolling and finish rolling on the obtained steel billet, wherein in the hot rolling and the finish rolling, the number of rolls is 110, and after the finish rolling, laminar cooling is adopted to reach 710 ℃ to obtain a hot-rolled black skin roll.
3. Hot acid annealing and pickling, surface roughness detection, cold rolling and finish machining and grinding.
4. Annealing the hot-rolled black skin coil, discharging the hot-rolled black skin coil from a furnace plate at the temperature of 1160 ℃, removing most of oxidized embroidery skin by straightening, shot blasting and sand blasting, wherein shot blasting is carried out for four times in total, the shot blasting rotating speed of No. 1 and No. 2 is 800r/min, and steel shots S110; 3# and 4# shot blasting rotating speed is 800r/min, and steel shots S110+ S70; then, the surface was roughly ground by a heavy brush at a rotation speed of 800rpm with a rolling reduction of 3.0 mm.
5. And (3) pickling the hot-rolled black coil subjected to shot blasting, wherein the pickling is carried out by adopting a sulfuric acid + 4-stage mixed acid (nitric acid + hydrofluoric acid) pickling process. The concentration of sulfuric acid is 189g/l, the concentration of nitric acid in the acid mixing zone at the 1 section is 67g/l, and the concentration of hydrofluoric acid is 4.1 g/l; the concentration of nitric acid in the acid mixing area at the 2-stage is 69g/l, and the concentration of hydrofluoric acid is 0.9 g/l; the concentration of nitric acid in the acid mixing area at the 3-stage is 42g/l, and the concentration of hydrofluoric acid is 0.8 g/l; the concentration of nitric acid in the acid mixing area of the 4 sections is 46g/l, and the concentration of hydrofluoric acid is 0.5 g/l.
6. After the acid washing in step 5, a white skin roll with a uniform surface thickness of 2.2mm was obtained, and the roughness Ra was 2.06 and the RZ1max was 18.57 (detection wavelength λ was 2.5 μm).
7. The white coil is processed by a cold rolling mill to obtain a plate surface with the thickness of 0.65mm2B, the finish machining grinding has the average production speed of 6.5m/min, the plate surface quality is uniform, and the requirements of 8K refined and color-plated plates are met.
Example 3
The 8K mirror plate manganese-nitrogen series nickel-saving austenitic stainless steel comprises the following components:
0.096% of C, Si: 0.447%, Mn: 7.682%, P: 0.039%, S: 0.000857%, Cr: 12%, Ni: 3%, Cu: 0.2%, N: 0.1531% and the balance Fe.
The method for preparing the 8K mirror panel by adopting the components comprises the following steps:
1. smelting the raw materials of the austenitic stainless steel with the components for 10min, casting the raw materials into a steel billet in a heating furnace, wherein the temperature of the continuously cast steel billet in the furnace is 397 ℃, the temperature of the continuously cast steel billet passing through a preheating interval is 700 ℃, the temperature of the first heating interval is 1150 ℃, the temperature of the second heating interval is 1250 ℃, and the temperature of a soaking section is 1268 ℃.
2. And (3) rolling the obtained steel billet by hot rolling and finish rolling in sequence, wherein in the hot rolling and the finish rolling, a roller rolls 67 coils, and after the finish rolling, laminar cooling is adopted to 691 ℃ to obtain a hot-rolled black skin coil.
3. Hot acid annealing and pickling, surface roughness detection, cold rolling and finish machining and grinding.
4. Annealing the hot-rolled black sheet coil, discharging the hot-rolled black sheet coil from a furnace at the temperature of 1164 ℃, removing most of oxidized embroidery skin by straightening, shot blasting and sand blasting, wherein shot blasting is performed for four times, the shot blasting rotating speed of No. 1 and No. 2 is 1200r/min, and the steel shot S110; 3# and 4# shot blasting rotating speed 1200r/min, and steel shots S110+ S70; then, the surface was roughly ground by a heavy brush at a rotation speed of 600rpm with a reduction of 2.0 mm.
5. And (3) pickling the hot-rolled black coil subjected to shot blasting, wherein the pickling adopts a sulfuric acid + 4-stage mixed acid (nitric acid + hydrofluoric acid) pickling process. The concentration of sulfuric acid is 180g/l, the concentration of nitric acid in the acid mixing zone at the 1 section is 60g/l, and the concentration of hydrofluoric acid is 4.0 g/l; the concentration of nitric acid in the 2-stage acid mixing area is 65g/l, and the concentration of hydrofluoric acid is 0.5 g/l; the concentration of nitric acid in the acid mixing area at the 3-stage is 40g/l, and the concentration of hydrofluoric acid is 0.6 g/l; the concentration of nitric acid in the acid mixing area of the 4 sections is 40g/l, and the concentration of hydrofluoric acid is 0.2 g/l.
6. After the acid washing in step 5, a white skin roll having a uniform surface thickness of 2.2mm was obtained, and the roughness average Ra was 2.71 and RZ1max was 20.33 (detection wavelength λ was 2.5 μm).
The white coil is processed by a cold rolling mill to obtain a plate surface with the thickness of 0.81mm & lt 2 & gt 2B & lt, the finish machining grinding average production speed is 5.5m/min, the plate surface quality is uniform, and the requirements of 8K refined and color-plated plates are met.
Example 4
The 8K mirror plate manganese-nitrogen series nickel-saving austenitic stainless steel comprises the following components:
0.127% of C, Si: 0.381%, Mn: 9.224%, P: 0.045%, S: 0.00201%, Cr: 18%, Ni: 1%, Cu: 2%, N: 0.1272% and the balance Fe.
The method for preparing the 8K mirror panel by adopting the components is as follows:
1. smelting the raw materials of the austenitic stainless steel with the components for 16min, casting the raw materials into a steel billet in a heating furnace, wherein the feeding temperature of the continuously cast steel billet is 454 ℃, the temperature of the continuously cast steel billet passing through a preheating interval is 900 ℃, the temperature of a first heating interval is 1262 ℃, the temperature of a second heating interval is 1270 ℃, and the temperature of a soaking section is 1300 ℃.
2. And (3) rolling the obtained steel billet by hot rolling and finish rolling in sequence, wherein in the hot rolling and the finish rolling, a roller rolls 138 coils, and after the finish rolling, laminar cooling is adopted to the temperature of 731 ℃ to obtain a hot-rolled black skin coil.
3. Hot acid annealing and pickling, surface roughness detection, cold rolling and finish machining and grinding.
4. Annealing the hot-rolled black sheet coil, discharging the hot-rolled black sheet coil from a furnace at the temperature of 1176 ℃, removing most of oxidized embroidery skin by straightening, shot blasting and sand blasting, wherein shot blasting is performed for four times, the shot blasting speed of No. 1 and No. 2 is 1400r/min, and the steel shot S110; 3# and 4# shot blasting rotating speed 1400r/min, and steel shots S110+ S70; then, the surface was roughly ground by a heavy brush at a speed of 1200rpm with a rolling reduction of 4.0 mm.
5. And (3) pickling the hot-rolled black coil subjected to shot blasting, wherein the pickling is carried out by adopting a sulfuric acid + 4-stage mixed acid (nitric acid + hydrofluoric acid) pickling process. The concentration of sulfuric acid is 190g/l, the concentration of nitric acid in the acid mixing zone at the 1 section is 70g/l, and the concentration of hydrofluoric acid is 4.5 g/l; the concentration of nitric acid in the acid mixing area at the 2-stage is 75g/l, and the concentration of hydrofluoric acid is 1.5 g/l; the concentration of nitric acid in the acid mixing area at the 3-stage is 50g/l, and the concentration of hydrofluoric acid is 1.1 g/l; the concentration of nitric acid in the acid mixing area of the 4 sections is 50g/l, and the concentration of hydrofluoric acid is 0.7 g/l.
6. After the acid washing in step 5, a white skin roll having a uniform surface and a thickness of 2.2mm was obtained, and the roughness average Ra was 1.97 and RZ1max was 17.88 (detection wavelength λ was 2.5 μm).
The white coil is processed by a cold rolling mill to obtain a plate surface with the thickness of 0.61mm & lt 2 & gt 2B & lt, the finish machining grinding average production speed is 6.0m/min, the plate surface quality is uniform, and the requirements of 8K refined and color plated plates are met.
Comparative example
The panels were prepared by a conventional process and compared to the panels prepared in examples 1-4 of the present invention, with the results shown in the following table.
| Item | Root bark of white Ra | White-skin RZ1MAX | Mirror grinding production speed m/min |
| Example 1 | 1.86 | 17.11 | 4.5 |
| Comparative example 1 | 3.52 | 32.4 | 3 |
| Example 2 | 2.06 | 18.57 | 6.5 |
| Comparative example 2 | 3.82 | 28.52 | 4 |
| Example 3 | 2.71 | 20.33 | 5.5 |
| Comparative example 3 | 3.98 | 34.69 | 3.3 |
| Example 4 | 1.97 | 17.88 | 6.0 |
| Comparative example 4 | 3.04 | 30.19 | 3.7 |
The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the invention pertains, numerous simple deductions or substitutions may be made without departing from the spirit of the invention, which shall be deemed to belong to the scope of the invention.
Claims (4)
1. A preparation method of 8K mirror plate manganese-nitrogen series nickel-austenite stainless steel is characterized by comprising the following steps:
s1, smelting and continuously casting the raw materials of the austenitic stainless steel into a steel billet; the raw materials comprise, by mass, 0.075-0.143% of C, 0.353-0.403% of Si, 8.109-9.032% of Mn, and P: 0.042% -0.05%, S: 0.0006% -0.00139%, N: 0.1443-0.153%, Cr 14.5-14.768%, Ni 1.195-1.202%, Cu 0.252-0.809% and Fe in balance; continuous casting is carried out in a heating furnace, the heating furnace comprises a preheating section and a heating section which are sequentially connected, the temperature of the preheating section is 700-900 ℃, the temperature of the heating section is 1150-1300 ℃, and the continuous casting drawing speed is 0.9-1.3 m/min; the heating interval comprises a first heating interval, a second heating interval and a soaking section which are sequentially communicated with one another, wherein the temperature of the soaking section is 8-30 ℃ higher than that of the second heating interval, and the temperature of the second heating interval is 90-100 ℃ higher than that of the first heating interval;
s2, sequentially rolling, annealing, pickling, detecting surface roughness, cold rolling and finish machining and grinding the obtained steel billet, wherein the pickling adopts a sulfuric acid and 4-section mixed acid pickling process, and the mixed acid is a mixture of nitric acid and hydrofluoric acid; the concentration of the sulfuric acid is 180-190g/L, the concentration of the nitric acid in the 1-stage acid mixing zone is 60-70g/L, and the concentration of the hydrofluoric acid is 4.0-4.5 g/L; the concentration of nitric acid in the 2-stage acid mixing area is 65-75g/L, and the concentration of hydrofluoric acid is 0.5-1.5 g/L; the concentration of nitric acid in the acid mixing area at the 3-stage is 40-50g/L, and the concentration of hydrofluoric acid is 0.6-1.1 g/L; the concentration of nitric acid in the acid mixing area of the 4 sections is 40-50g/L, and the concentration of hydrofluoric acid is 0.2-0.7 g/L.
2. The method of producing an 8K mirror plate manganese-nitrogen nodular nickel austenitic stainless steel of claim 1, wherein: in the step S1, the refining time during the smelting of the austenitic stainless steel liquid is 10 minutes or more.
3. The method of making an 8K mirror plate manganese-nitrogen-bonded nickel austenitic stainless steel of claim 1, wherein: in the step S2, shot blasting and re-brushing processes are sequentially performed between the annealing and pickling processes, wherein the shot blasting speed is 800-1400 r/min, the re-brushing speed is 600-1200 rpm, and the reduction is 2-4 mm.
4. The method of producing an 8K mirror plate manganese-nitrogen nodular nickel austenitic stainless steel of claim 1, wherein: and annealing and pickling to obtain the white leather roll with a uniform plate surface, wherein Ra is less than or equal to 2.8 mu m when the surface roughness of the white leather roll is detected.
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