CN104046880A - Cold-rolled steel strip and production method thereof - Google Patents
Cold-rolled steel strip and production method thereof Download PDFInfo
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- CN104046880A CN104046880A CN201410261111.8A CN201410261111A CN104046880A CN 104046880 A CN104046880 A CN 104046880A CN 201410261111 A CN201410261111 A CN 201410261111A CN 104046880 A CN104046880 A CN 104046880A
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Abstract
The invention discloses a cold-rolled steel strip and a production method thereof. The cold-rolled steel strip is prepared from raw materials such as scrap steel, No.45 steel, chromium, aluminum, nickel, titanium, cobalt and lanthanum by virtue of the steps of smelting, forging, hot rolling, cold rolling and the like. The cold-rolled steel strip disclosed by the invention is easy to produce, good in quality and suitable for industries, namely an automobile, a motorcycle, a resistance furnace, an electrical heating element and the like.
Description
Technical field
The present invention relates to a kind of steel band and production method thereof.Specifically, be ferrum-chromium-aluminum electrical heating alloys cold-rolled steel strip and production method thereof.Be applicable to the industries such as automobile, motorcycle, resistance furnace, electrically heated components and parts.
Background technology
At metallurgy industry, traditional Aludirome steel mainly contains the elements such as carbon, silicon, manganese, phosphorus, sulphur, chromium, nickel and aluminium, because Aludirome steel is that ferrite slightly spreads alloy, while smelting cast, easily form thick columnar grain, while making to forge, very easily cause stress crack, head-tail cracking.During with this Aludirome steel rolling steel band, easily there is the situations such as raw edges, broken belt, middle shrinkage cavity, Durchgangshohle.Therefore, with the cold rolling one-tenth steel band of this Aludirome steel, production difficulty is large, and the steel band of producing is second-rate.
Summary of the invention
The problem to be solved in the present invention is to provide a kind of cold-rolled steel strip.This cold-rolled steel strip, easily raw quality is good.
For addressing the above problem, take following technical scheme:
Cold-rolled steel strip of the present invention, is characterized in that the raw material that contains following parts by weight:
Wastes of iron and steel 40 ~ 46 weight parts;
No. 45 steel 20 ~ 30 weight parts;
Chromium 18 ~ 20 weight parts;
Aluminium 4 ~ 6 weight parts;
Nickel 0.3 ~ 0.5 weight part;
Titanium 0.1 ~ 0.2 weight part;
Cobalt 0.01 ~ 0.07 weight part;
Lanthanum 0.01 ~ 0.06 weight part.
2. the method for cold-rolled steel strip described in production claim 1, is characterized in that comprising the following steps successively:
Smelt:
First iron and steel scrap is toasted, remove moisture wherein;
Afterwards, will in moisture free iron and steel scrap and No. 45 steel input electric furnaces, be fused into molten metal;
Afterwards, carry out on-the-spot sample analysis, and the element in metallic solution is adjusted, the % by weight that makes carbon, silicon, manganese, p and s account for respectively metallic solution is:
Carbon 0.005 ~ 0.010 % by weight
Silicon 0.10 ~ 0.20 % by weight
Manganese 0.10 ~ 0.30 % by weight
Phosphorus 0.005 ~ 0.015 % by weight
Sulphur 0.005 ~ 0.018 % by weight;
Afterwards, add chromium, aluminium, nickel element;
Afterwards, the metallic solution of adjusting is poured in vacuum electric furnace, added titanium, cobalt, lanthanum element, and remove oxygen, hydrogen and nitrogen in metallic solution;
Afterwards, metallic solution is poured into steel ingot;
Forge:
The gas-fired furnace of first steel ingot being put into temperature and be 1100 ~ 1200 degrees Celsius heats, and when by Heating Steel Ingots to 1100 ~ 1200 degree Celsius, constant temperature keeps 30 ~ 36 minutes;
Afterwards, steel ingot is forged into the square ingot that the length of side of cross section is 140mm;
Afterwards, to carrying out reconditioning, finishing, cleaning through the square ingot forging, remove the residual defects in smelting, forging process;
Hot rolling:
First carry out successively preheating, soaking and insulation with process furnace the other side ingot, and the side's of making ingot stops 20 ~ 26 minutes at preheating section, soaking zone and holding-zone respectively, the side's of making ingot temperature reaches 1100 ~ 1200 degrees Celsius;
Afterwards, utilizing cross-arranging type four stand mill that square ingot roughing is become to thickness is the slab of 50 ~ 60mm;
Afterwards, with six frame hot continuous mills, slab finish rolling is become to the torrid zone of 2.8 ~ 3.0mm; In the time that tropical temperature is down to 800 ~ 850 degrees Celsius, tropical hot rolling is become to steel coil strip;
Cold rolling:
Steel coil strip is put into bell furnace, and to be warming up to successively 800 degrees Celsius be insulation 8 hours, be cooled to 600 degrees Celsius removes outer cover, continues to be cooled to 250 degrees Celsius and remove inner cover and come out of the stove, carry out softening annealing;
Afterwards, by being put on semicontinuous pickling machine taking the speed of 10 ~ 12 meters by acid strength as 15 ~ 20% through the steel coil strip of softening annealing, acid liquor temperature is the pickling tank of 60 ~ 80 degrees Celsius, carries out pickling, removes the iron scale of steel strip surface;
Afterwards, use the steel band after pickling is rolled into the made-up belt that thickness is 1.2mm, carry out breaking down;
Afterwards, the made-up belt of breaking down is rolled into the made-up belt that thickness is 0.6mm, in carrying out, rolls;
Afterwards, make through in the made-up belt that rolls with the speed of 3 ~ 5 ms/min by the continuous bright annealing furnace with the protection of decomposed ammonia body, under 820 degree celsius temperature, carry out the annealing of recrystallize intermediate softening;
Afterwards, the work in-process steel band of 0.17mm will be rolled into through the made-up belt of recrystallize intermediate softening annealing;
Afterwards, make work in-process steel band pass through the continuous bright annealing furnace with the protection of decomposed ammonia body with the speed of 5 ~ 7 ms/min, under 820 degree celsius temperature, carry out the annealing of recrystallize intermediate softening;
Finally, by be rolled into the steel band of 0.06mm through the work in-process steel band of recrystallize intermediate softening annealing, obtain cold-rolled steel strip of the present invention.
Take such scheme, have the following advantages:
As can be seen from the above scheme, owing to being added with the elements such as titanium, cobalt, lanthanum in cold-rolled steel strip of the present invention, slow down the tendency of growing up of ferrum-chromium-aluminum electrical heating alloys crystal grain, prevent separating out of fragility phase, improve the plasticity of Aludirome, avoid the just generation with the fracture in the course of processing, raw edges, broken belt, middle shrinkage cavity, Durchgangshohle situation, thereby reduced the production difficulty of cold-rolled steel strip of the present invention, improved the quality of production of cold-rolled steel strip.
Embodiment
Below in conjunction with embodiment, the present invention is described in further details:
Embodiment mono-
First choose the iron and steel scrap of 40 weight parts, No. 45 steel of 20 weight parts, the chromium of 18 weight parts, the aluminium of 4.00 weight parts, the nickel of 0.3 weight part, the titanium of 0.10 weight part, the cobalt of 0.01 weight part, the lanthanum of 0.01 weight part, stand-by.
The first step is smelted
First iron and steel scrap is toasted, remove moisture wherein.
Afterwards, will in moisture free iron and steel scrap and No. 45 steel input electroslag remelting furnaces, be fused into molten metal.
Afterwards, carry out on-the-spot sample analysis, and the element in metallic solution is adjusted, the % by weight that makes carbon, silicon, manganese, p and s account for respectively metallic solution is:
Carbon 0.005 % by weight
Silicon 0.10 % by weight
Manganese 0.10 % by weight
Phosphorus 0.005 % by weight
Sulphur 0.005 % by weight.
Afterwards, add chromium, aluminium, nickel element.
Afterwards, the metallic solution of adjusting is poured in vacuum induction furnace, added titanium, cobalt, lanthanum element, and remove oxygen, hydrogen and nitrogen in metallic solution.
Afterwards, metallic solution is poured into steel ingot.
Second step forges
The gas-fired furnace of first steel ingot being put into temperature and be 1100 degrees Celsius heats, and when by Heating Steel Ingots to 1100 degree Celsius, constant temperature keeps 30 minutes.
Afterwards, be forged into 1000 tons of monomer air hammer the square ingot that the length of side of cross section is 140mm.
Afterwards, to carrying out reconditioning, finishing, cleaning through the square ingot forging, remove the residual defects in smelting, forging process with sharpening machine.
The 3rd step is carried out hot rolling
First carry out successively preheating, soaking and insulation with stepped start-stop system gas-fired furnace the other side ingot, and the side's of making ingot stops 20 minutes at preheating section, soaking zone and holding-zone respectively, the side's of making ingot temperature reaches 1100 degrees Celsius.
Afterwards, utilize cross-arranging type four stand mill that square ingot roughing is become to the slab that thickness is 50mm.
Afterwards, with six frame hot continuous mills, slab finish rolling is become to the torrid zone of 2.8mm.In the time that tropical temperature is down to 800 degrees Celsius, tropical hot rolling is become to steel coil strip with horizontal reel.
The 4th step is carried out cold rolling
Steel coil strip is put into electric heating strong convection bell-type furnace or electrically heated pit furnace, and to be warming up to successively 820 are insulation 8 hours, be cooled to 600 degrees Celsius removes outer cover, continues to be cooled to 250 degrees Celsius and remove inner cover and come out of the stove, carry out softening annealing.
Afterwards, by being put on semicontinuous pickling machine taking the speed of 10 meters by acid strength as 15% through the steel coil strip of softening annealing, acid liquor temperature is the pickling tank of 60 degrees Celsius, carries out pickling, removes the iron scale of steel strip surface.
Afterwards, the steel band after pickling is rolled into the made-up belt that thickness is 1.2mm with four roller high-speed cold mills, carries out breaking down.
Afterwards, the made-up belt of breaking down is rolled into the made-up belt that thickness is 0.6mm with four roller reversable cold-rolling machines, in carrying out, rolls.
Afterwards, make through in the made-up belt that rolls with the speed of 3 ms/min by the continuous bright annealing furnace with the protection of decomposed ammonia body, under 820 degree celsius temperature, carry out the annealing of recrystallize intermediate softening.
Afterwards, the work in-process steel band of 0.17mm will be rolled into through the made-up belt of recrystallize intermediate softening annealing with six roller high speed reversible precise cold milling trains.
Afterwards, make work in-process steel band pass through the continuous bright annealing furnace with the protection of decomposed ammonia body with the speed of 4 ms/min, under 820 degree celsius temperature, carry out the annealing of recrystallize intermediate softening.
Finally, with six roller high speed reversible precise cold milling trains, by be rolled into the steel band of 0.08mm through the work in-process steel band of recrystallize intermediate softening annealing, obtain cold-rolled steel strip of the present invention.
Embodiment bis-
First choose the iron and steel scrap of 44 weight parts, No. 45 steel of 25 weight parts, the chromium of 19 weight parts, the aluminium of 5 weight parts, the nickel of 0.4 weight part, the titanium of 0.15 weight part, the cobalt of 0.04 weight part, the lanthanum of 0.04 weight part, stand-by.
The first step is smelted
First iron and steel scrap is toasted, remove moisture wherein.
Afterwards, will in moisture free iron and steel scrap and No. 45 steel input electroslag remelting furnaces, be fused into molten metal.
Afterwards, carry out on-the-spot sample analysis, and the element in metallic solution is adjusted, the % by weight that makes carbon, silicon, manganese, p and s account for respectively metallic solution is:
Carbon 0.007 % by weight
Silicon 0.15 % by weight
Manganese 0.20 % by weight
Phosphorus 0.010 % by weight
Sulphur 0.010 % by weight.
Afterwards, add chromium, aluminium, nickel element.
Afterwards, the metallic solution of adjusting is poured in vacuum induction furnace, added titanium, cobalt, lanthanum element, and remove oxygen, hydrogen and nitrogen in metallic solution.
Afterwards, metallic solution is poured into steel ingot.
Second step forges
The gas-fired furnace of first steel ingot being put into temperature and be 1150 degrees Celsius heats, and when by Heating Steel Ingots to 1140 degree Celsius, constant temperature keeps 33 minutes.
Afterwards, be forged into 1000 tons of monomer air hammer the square ingot that the length of side of cross section is 140mm.
Afterwards, to carrying out reconditioning, finishing, cleaning through the square ingot forging, remove the residual defects in smelting, forging process with sharpening machine.
The 3rd step is carried out hot rolling
First carry out successively preheating, soaking and insulation with stepped start-stop system gas-fired furnace the other side ingot, and the side's of making ingot stops 23 minutes at preheating section, soaking zone and holding-zone respectively, the side's of making ingot temperature reaches 1160 degrees Celsius.
Afterwards, utilize cross-arranging type four stand mill that square ingot roughing is become to the slab that thickness is 55mm.
Afterwards, with six frame hot continuous mills, slab finish rolling is become to the torrid zone of 2.9mm.In the time that tropical temperature is down to 830 degrees Celsius, tropical hot rolling is become to steel coil strip with horizontal reel.
The 4th step is carried out cold rolling
Steel coil strip is put into electric heating strong convection bell-type furnace or electrically heated pit furnace, and to be warming up to successively 820 degrees Celsius be insulation 10 hours, be cooled to 600 degrees Celsius removes outer cover, continues to be cooled to 250 degrees Celsius and remove inner cover and come out of the stove, carry out softening annealing.
Afterwards, by being put on semicontinuous pickling machine taking the speed of 13 meters by acid strength as 18% through the steel coil strip of softening annealing, the pickling tank of acid liquor temperature as 70, carry out pickling, remove the iron scale of steel strip surface.
Afterwards, the steel band after pickling is rolled into the made-up belt that thickness is 1.2mm with four roller high-speed cold mills, carries out breaking down.
Afterwards, the made-up belt of breaking down is rolled into the made-up belt that thickness is 0.6mm with four roller reversable cold-rolling machines, in carrying out, rolls.
Afterwards, make through in the made-up belt that rolls with the speed of 4 ms/min by the continuous bright annealing furnace with the protection of decomposed ammonia body, under 820 degree celsius temperature, carry out the annealing of recrystallize intermediate softening.
Afterwards, the work in-process steel band of 0.17mm will be rolled into through the made-up belt of recrystallize intermediate softening annealing with six roller high speed reversible precise cold milling trains.
Afterwards, make work in-process steel band pass through the continuous bright annealing furnace with the protection of decomposed ammonia body with the speed of 5 ms/min, under 820 degree celsius temperature, carry out the annealing of recrystallize intermediate softening.
Finally, with six roller high speed reversible precise cold milling trains, by be rolled into the steel band of 0.08mm through the work in-process steel band of recrystallize intermediate softening annealing, obtain cold-rolled steel strip of the present invention.
Embodiment tri-
First choose the iron and steel scrap of 46 weight parts, No. 45 steel of 30 weight parts, the chromium of 20 weight parts, the aluminium of 6 weight parts, the nickel of 0.5 weight part, the titanium of 0.2 weight part, the cobalt of 0.07 weight part, the lanthanum of 0.06 weight part, stand-by.
The first step is smelted
First iron and steel scrap is toasted, remove moisture wherein.
Afterwards, will in moisture free iron and steel scrap and No. 45 steel input electroslag remelting furnaces, be fused into molten metal.
Afterwards, carry out on-the-spot sample analysis, and the element in metallic solution is adjusted, the % by weight that makes carbon, silicon, manganese, p and s account for respectively metallic solution is:
Carbon 0.01 % by weight
Silicon 0.2 % by weight
Manganese 0.3 % by weight
Phosphorus 0.015 % by weight
Sulphur 0.018 % by weight.
Afterwards, add chromium, aluminium, nickel element.
Afterwards, the metallic solution of adjusting is poured in vacuum induction furnace, added titanium, cobalt, lanthanum element, and remove oxygen, hydrogen and nitrogen in metallic solution.
Afterwards, metallic solution is poured into steel ingot.
Second step forges
The gas-fired furnace of first steel ingot being put into temperature and be 1200 degrees Celsius heats, and when by Heating Steel Ingots to 1200 degree Celsius, constant temperature keeps 36 minutes.
Afterwards, be forged into 1000 tons of monomer air hammer the square ingot that the length of side of cross section is 140mm.
Afterwards, to carrying out reconditioning, finishing, cleaning through the square ingot forging, remove the residual defects in smelting, forging process with sharpening machine.
The 3rd step is carried out hot rolling
First carry out successively preheating, soaking and insulation with stepped start-stop system gas-fired furnace the other side ingot, and the side's of making ingot stops 26 minutes at preheating section, soaking zone and holding-zone respectively, the side's of making ingot temperature reaches 1200 degrees Celsius.
Afterwards, utilize cross-arranging type four stand mill that square ingot roughing is become to the slab that thickness is 60mm.
Afterwards, with six frame hot continuous mills, slab finish rolling is become to the torrid zone of 3.0mm.In the time that tropical temperature is down to 850 degrees Celsius, tropical hot rolling is become to steel coil strip with horizontal reel.
The 4th step is carried out cold rolling
Steel coil strip is put into electric heating strong convection bell-type furnace or electrically heated pit furnace, and to be warming up to successively 820 degrees Celsius be insulation 10 hours, be cooled to 600 degrees Celsius removes outer cover, continues to be cooled to 250 degrees Celsius and remove inner cover and come out of the stove, carry out softening annealing.
Afterwards, by being put on semicontinuous pickling machine taking the speed of 15 meters by acid strength as 20% through the steel coil strip of softening annealing, the pickling tank of acid liquor temperature as 80, carry out pickling, remove the iron scale of steel strip surface.
Afterwards, the steel band after pickling is rolled into the made-up belt that thickness is 1.2mm with four roller high-speed cold mills, carries out breaking down.
Afterwards, the made-up belt of breaking down is rolled into the made-up belt that thickness is 0.6mm with four roller reversable cold-rolling machines, in carrying out, rolls.
Afterwards, make through in the made-up belt that rolls with the speed of 5 ms/min by the continuous bright annealing furnace with the protection of decomposed ammonia body, under 820 degree celsius temperature, carry out the annealing of recrystallize intermediate softening.
Afterwards, the work in-process steel band of 0.17mm will be rolled into through the made-up belt of recrystallize intermediate softening annealing with six roller high speed reversible precise cold milling trains.
Afterwards, make work in-process steel band pass through the continuous bright annealing furnace with the protection of decomposed ammonia body with the speed of 6 ms/min, under 820 degree celsius temperature, carry out the annealing of recrystallize intermediate softening.
Finally, with six roller high speed reversible precise cold milling trains, by be rolled into the steel band of 0.08mm through the work in-process steel band of recrystallize intermediate softening annealing, obtain cold-rolled steel strip of the present invention.
Claims (2)
1. a cold-rolled steel strip, is characterized in that the raw material that contains following parts by weight:
Wastes of iron and steel 40 ~ 46 weight parts;
No. 45 steel 20 ~ 30 weight parts;
Chromium 18 ~ 20 weight parts;
Aluminium 4 ~ 6 weight parts;
Nickel 0.3 ~ 0.5 weight part;
Titanium 0.1 ~ 0.2 weight part;
Cobalt 0.01 ~ 0.07 weight part;
Lanthanum 0.01 ~ 0.06 weight part.
2. the method for cold-rolled steel strip described in production claim 1, is characterized in that comprising the following steps successively:
Smelt:
First iron and steel scrap is toasted, remove moisture wherein;
Afterwards, will in moisture free iron and steel scrap and No. 45 steel input electric furnaces, be fused into molten metal;
Afterwards, carry out on-the-spot sample analysis, and the element in metallic solution is adjusted, the % by weight that makes carbon, silicon, manganese, p and s account for respectively metallic solution is:
Carbon 0.005 ~ 0.010 % by weight
Silicon 0.10 ~ 0.20 % by weight
Manganese 0.10 ~ 0.30 % by weight
Phosphorus 0.005 ~ 0.015 % by weight
Sulphur 0.005 ~ 0.018 % by weight;
Afterwards, add chromium, aluminium, nickel element;
Afterwards, the metallic solution of adjusting is poured in vacuum electric furnace, added titanium, cobalt, lanthanum element, and remove oxygen, hydrogen and nitrogen in metallic solution;
Afterwards, metallic solution is poured into steel ingot;
Forge:
The gas-fired furnace of first steel ingot being put into temperature and be 1100 ~ 1200 degrees Celsius heats, and when by Heating Steel Ingots to 1100 ~ 1200 degree Celsius, constant temperature keeps 30 ~ 36 minutes;
Afterwards, steel ingot is forged into the square ingot that the length of side of cross section is 140mm;
Afterwards, to carrying out reconditioning, finishing, cleaning through the square ingot forging, remove the residual defects in smelting, forging process;
Hot rolling:
First carry out successively preheating, soaking and insulation with process furnace the other side ingot, and the side's of making ingot stops 20 ~ 26 minutes at preheating section, soaking zone and holding-zone respectively, the side's of making ingot temperature reaches 1100 ~ 1200 degrees Celsius;
Afterwards, utilizing cross-arranging type four stand mill that square ingot roughing is become to thickness is the slab of 50 ~ 60mm;
Afterwards, with six frame hot continuous mills, slab finish rolling is become to the torrid zone of 2.8 ~ 3.0mm; In the time that tropical temperature is down to 800 ~ 850, tropical hot rolling is become to steel coil strip;
Cold rolling:
Steel coil strip is put into bell furnace, and to be warming up to successively 800 degrees Celsius be insulation 8 hours, be cooled to 600 degrees Celsius removes outer cover, continues to be cooled to 250 degrees Celsius and remove inner cover and come out of the stove, carry out softening annealing;
Afterwards, by being put on semicontinuous pickling machine taking the speed of 10 ~ 12 meters by acid strength as 15 ~ 20% through the steel coil strip of softening annealing, acid liquor temperature is the pickling tank of 60 ~ 80 degrees Celsius, carries out pickling, removes the iron scale of steel strip surface;
Afterwards, use the steel band after pickling is rolled into the made-up belt that thickness is 1.2mm, carry out breaking down;
Afterwards, the made-up belt of breaking down is rolled into the made-up belt that thickness is 0.6mm, in carrying out, rolls;
Afterwards, make through in the made-up belt that rolls with the speed of 3 ~ 5 ms/min by the continuous bright annealing furnace with the protection of decomposed ammonia body, under 820 degree celsius temperature, carry out the annealing of recrystallize intermediate softening;
Afterwards, the work in-process steel band of 0.17mm will be rolled into through the made-up belt of recrystallize intermediate softening annealing;
Afterwards, make work in-process steel band pass through the continuous bright annealing furnace with the protection of decomposed ammonia body with the speed of 5 ~ 7 ms/min, under 820 degree celsius temperature, carry out the annealing of recrystallize intermediate softening;
Finally, by be rolled into the steel band of 0.06mm through the work in-process steel band of recrystallize intermediate softening annealing, obtain cold-rolled steel strip of the present invention.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104762564A (en) * | 2015-03-20 | 2015-07-08 | 苏州科胜仓储物流设备有限公司 | Stainless steel used for transporting carriage steel pipe and preparation method thereof |
| CN107058707A (en) * | 2017-04-11 | 2017-08-18 | 无锡华生精密材料股份有限公司 | A kind of production method of bright titaniferous stainless steel band |
| CN111644926A (en) * | 2020-05-19 | 2020-09-11 | 马永会 | Efficient polishing method for ultrathin strip steel |
| CN113113204A (en) * | 2021-04-09 | 2021-07-13 | 北京北冶功能材料有限公司 | Magnetic temperature compensation alloy for deep low temperature |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102943217A (en) * | 2012-10-27 | 2013-02-27 | 无锡舜特精密合金板带有限公司 | Cold rolling steel strip and production method thereof |
-
2014
- 2014-06-13 CN CN201410261111.8A patent/CN104046880A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102943217A (en) * | 2012-10-27 | 2013-02-27 | 无锡舜特精密合金板带有限公司 | Cold rolling steel strip and production method thereof |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104762564A (en) * | 2015-03-20 | 2015-07-08 | 苏州科胜仓储物流设备有限公司 | Stainless steel used for transporting carriage steel pipe and preparation method thereof |
| CN107058707A (en) * | 2017-04-11 | 2017-08-18 | 无锡华生精密材料股份有限公司 | A kind of production method of bright titaniferous stainless steel band |
| CN111644926A (en) * | 2020-05-19 | 2020-09-11 | 马永会 | Efficient polishing method for ultrathin strip steel |
| CN111644926B (en) * | 2020-05-19 | 2022-01-14 | 太原日德泰兴精密不锈钢股份有限公司 | Efficient polishing method for ultrathin strip steel |
| CN113113204A (en) * | 2021-04-09 | 2021-07-13 | 北京北冶功能材料有限公司 | Magnetic temperature compensation alloy for deep low temperature |
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Application publication date: 20140917 |