CN113462968A - Nickel-saving austenitic stainless steel and manufacturing process thereof - Google Patents
Nickel-saving austenitic stainless steel and manufacturing process thereof Download PDFInfo
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- CN113462968A CN113462968A CN202110682125.7A CN202110682125A CN113462968A CN 113462968 A CN113462968 A CN 113462968A CN 202110682125 A CN202110682125 A CN 202110682125A CN 113462968 A CN113462968 A CN 113462968A
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- 229910000963 austenitic stainless steel Inorganic materials 0.000 title claims abstract description 40
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 19
- 238000005096 rolling process Methods 0.000 claims abstract description 58
- 238000010438 heat treatment Methods 0.000 claims abstract description 46
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 11
- 238000009749 continuous casting Methods 0.000 claims abstract description 9
- 238000005098 hot rolling Methods 0.000 claims abstract description 6
- 238000003723 Smelting Methods 0.000 claims abstract description 5
- 238000007670 refining Methods 0.000 claims abstract description 5
- 239000000126 substance Substances 0.000 claims abstract description 5
- 229910052729 chemical element Inorganic materials 0.000 claims abstract description 4
- 229910000831 Steel Inorganic materials 0.000 claims description 18
- 239000010959 steel Substances 0.000 claims description 18
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 10
- 238000002791 soaking Methods 0.000 claims description 10
- 229910052799 carbon Inorganic materials 0.000 claims description 9
- 229910052804 chromium Inorganic materials 0.000 claims description 9
- 238000001816 cooling Methods 0.000 claims description 9
- 229910052757 nitrogen Inorganic materials 0.000 claims description 9
- 239000003795 chemical substances by application Substances 0.000 claims description 8
- 229910052750 molybdenum Inorganic materials 0.000 claims description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 8
- 229910052748 manganese Inorganic materials 0.000 claims description 7
- 238000007664 blowing Methods 0.000 claims description 6
- 229910052698 phosphorus Inorganic materials 0.000 claims description 6
- 238000010079 rubber tapping Methods 0.000 claims description 6
- 235000007164 Oryza sativa Nutrition 0.000 claims description 5
- 239000010903 husk Substances 0.000 claims description 5
- 235000009566 rice Nutrition 0.000 claims description 5
- 229910052802 copper Inorganic materials 0.000 claims description 4
- 239000012535 impurity Substances 0.000 claims description 4
- 238000005070 sampling Methods 0.000 claims description 4
- 229910000616 Ferromanganese Inorganic materials 0.000 claims description 3
- 230000001914 calming effect Effects 0.000 claims description 3
- 238000005520 cutting process Methods 0.000 claims description 3
- 229910052742 iron Inorganic materials 0.000 claims description 3
- DALUDRGQOYMVLD-UHFFFAOYSA-N iron manganese Chemical compound [Mn].[Fe] DALUDRGQOYMVLD-UHFFFAOYSA-N 0.000 claims description 3
- 239000011574 phosphorus Substances 0.000 claims description 3
- 238000005507 spraying Methods 0.000 claims description 3
- 229910052717 sulfur Inorganic materials 0.000 claims description 3
- 238000005266 casting Methods 0.000 claims description 2
- 239000011248 coating agent Substances 0.000 claims description 2
- 238000000576 coating method Methods 0.000 claims description 2
- 239000000843 powder Substances 0.000 claims description 2
- 240000007594 Oryza sativa Species 0.000 claims 1
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 abstract description 16
- 230000007797 corrosion Effects 0.000 abstract description 13
- 238000005260 corrosion Methods 0.000 abstract description 13
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 abstract description 7
- 239000011651 chromium Substances 0.000 description 9
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 6
- 239000002893 slag Substances 0.000 description 6
- 239000010949 copper Substances 0.000 description 5
- 229910001220 stainless steel Inorganic materials 0.000 description 5
- 241000209094 Oryza Species 0.000 description 4
- 239000010935 stainless steel Substances 0.000 description 4
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 230000004907 flux Effects 0.000 description 3
- 239000011733 molybdenum Substances 0.000 description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005034 decoration Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000010583 slow cooling Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/46—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting
- B21B1/466—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting in a non-continuous process, i.e. the cast being cut before rolling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B3/00—Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences ; Rolling of aluminium, copper, zinc or other non-ferrous metals
- B21B3/02—Rolling special iron alloys, e.g. stainless steel
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
- B21B45/0203—Cooling
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
- B21B2001/225—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length by hot-rolling
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/001—Austenite
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
The invention discloses a nickel-saving austenitic stainless steel and a manufacturing process thereof, wherein the nickel-saving austenitic stainless steel comprises the following chemical components in percentage by weight: the invention relates to nickel-saving austenitic stainless steel and a manufacturing process thereof, wherein the nickel-saving austenitic stainless steel comprises the following steps of smelting in an AOD furnace, refining in an LF furnace, continuous casting, hot rolling and heating, rough rolling, finish rolling and coiling, the processing performance of the austenitic stainless steel is improved, the nickel content is further optimized and controlled, the molybdenum element is added into the austenitic stainless steel, the proportion of chemical elements is more reasonable, and the austenitic stainless steel can show excellent hole corrosion resistance.
Description
Technical Field
The invention belongs to the technical field of austenitic stainless steel processing, and particularly relates to nickel-saving austenitic stainless steel and a manufacturing process thereof.
Background
In the existing nickel-saving austenitic stainless steel, stainless steel production enterprises are also actively developing the nickel-saving austenitic stainless steel, but most of the nickel-saving austenitic stainless steel saves nickel and is added with copper element with higher content, so that the hot working performance is deteriorated, the defects such as edge crack and the like are generated, the yield is influenced, and the surface defects are more in the use process of decoration and the like due to insufficient purity of molten steel and more impurities, and the use of customers is influenced; also, in order to enhance corrosion resistance, the corrosion resistance of austenitic stainless steels is improved by high chromium content and nitrogen, but in certain environments, such as chloride environments, the pitting corrosion resistance is significantly reduced.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides nickel-saving austenitic stainless steel and a manufacturing process thereof, which solve the problem of processing performance of the austenitic stainless steel, further optimize and control the nickel content, and add molybdenum element in the austenitic stainless steel, so that the proportion of all chemical elements is more reasonable, and the austenitic stainless steel can show better pitting corrosion resistance.
In order to achieve the purpose, the invention adopts the technical scheme that:
a nickel-saving austenitic stainless steel and a manufacturing process thereof, the chemical components of which by weight percentage are as follows: less than or equal to 0.15 percent of C, less than or equal to 0.5 percent of Si, less than or equal to 8.5 percent of Mn, less than or equal to 0.05 percent of P, less than or equal to 0.003 percent of S, less than or equal to 13 percent of Cr, less than or equal to 0.8 percent of Ni, less than or equal to 0.15 percent of N, less than or equal to 0.05 percent of Cu, less than or equal to 0.0025 percent of B, less than or equal to 13 percent of Mo, and the balance of Fe and a small amount of inevitable impurities;
the manufacturing process of the nickel-saving austenitic stainless steel comprises the following steps:
step 1, AOD furnace smelting: sequentially adding less than or equal to 0.1 percent of C, less than or equal to 0.5 percent of Si, less than or equal to 0.5 percent of Mn, less than or equal to 9 percent of Mn, less than or equal to 13.5 percent of Cr, less than or equal to 0.8 percent of Ni, less than or equal to 0.15 percent of N, less than or equal to 13 percent of Mo, and the balance of low-phosphorus molten steel scrap and high-carbon molten ferromanganese, wherein the tapping temperature is 1600-1650 ℃;
step 2, refining in an LF furnace: the station entering time is more than or equal to 60 min/furnace, the strong blowing time is more than or equal to 12min, the weak blowing time is more than or equal to 15min, the calming time is more than or equal to 15min, and the tapping temperature is 1550-1600 ℃;
step 3, continuous casting, namely continuously passing molten steel through a water-cooled crystallizer, condensing the molten steel into a hard shell, continuously pulling out the hard shell from an outlet below the crystallizer, cooling by spraying water, completely solidifying and cutting into blanks;
step 4, hot rolling and heating: the thickness of the plate blank is 180 mm-220 mm, the furnace entry temperature is 520-560 ℃, the preheating section temperature is 750-900 ℃, the heating time is 20 min-30 min, the preheating section ends and enters a first heating section, the first heating section temperature is 1010-1050 ℃, the time is controlled to be 45 min-55 min, the first heating section ends and enters a second heating section, the second heating section temperature is 1165-1185 ℃, the time is controlled to be 55 min-65 min, the second heating section ends and enters a soaking section, the soaking section temperature is 1285-1295 ℃, the time is controlled to be 40 min-50 min, and the total heating time in the furnace is controlled to be 160 min-200 min;
step 5, rough rolling: the first pass rolling reduction is controlled to be 27.1-29.5%, the second pass rolling reduction is controlled to be 32.1-35.3%, the third pass rolling reduction is controlled to be 36.5-38.4%, the fourth pass rolling reduction is controlled to be 32.3-33.1%, the fifth pass rolling reduction is controlled to be 22.3-23.7%, the first and third passes of descaling are carried out, and the descaling speed is 0.8-1.8 m/s;
step 6, finish rolling: and (3) removing scale by using steam while feeding water for finish rolling, wherein the inlet temperature of the finish rolling is 1020-1120 ℃, the outlet temperature of the finish rolling is more than 980 ℃, and the pass reduction rates of 8 finish rolling mills are respectively F1: 40.1 to 42.1 percent of F2, 38.1 to 39.2 percent of F2, 35.1 to 37.1 percent of F3, 30.1 to 33.4 percent of F4, 25.2 to 28.5 percent of F5, 21.4 to 22.3 percent of F6, 19.1 to 20.8 percent of F7 and 15.2 to 18.1 percent of F8;
step 7, coiling: and (3) applying laminar cooling, wherein the coiling temperature is higher than 680 ℃, immediately stacking and slowly cooling the black skin coil after coiling, and uncoiling, thickness measuring and sampling can be carried out when the temperature is lower than 100 ℃.
Preferably, step 3, continuous casting: target temperature corresponds to target pull rate: the specific size is three, the middle package temperature is 1468-1479 ℃, the corresponding pulling speed is 1.20-1.25 m/min, the specific size is four, the middle package temperature is 1468-1479 ℃, the corresponding pulling speed is 1.20-1.25 m/min, the specific size is five, the middle package temperature is 1468-1479 ℃, the corresponding pulling speed is 1.05-1.10 m/min, the usage amount of the crystallizer casting powder is controlled to be 0.4-0.5 kg/ton of steel, and the middle coating covering agent is carbonized rice husks.
Compared with the prior art, the invention has the beneficial effects that:
1) according to the invention, the nickel content in the austenitic stainless steel is further controlled and optimized, the nickel content in the stainless steel is reduced, the production cost can be further reduced, the production stability of the austenitic stainless steel is ensured, and meanwhile, in the finish rolling process, the inlet temperature is increased, the black skin is coiled and then stacked for slow cooling, so that the processing performance of the subsequent austenitic stainless steel is improved.
2) The austenitic stainless steel containing chromium, nitrogen and molybdenum is formed by increasing molybdenum element in the austenitic stainless steel, so that the application range is enlarged, the corrosion resistance is further enhanced, and the austenitic stainless steel can show excellent pitting corrosion resistance and interstitial corrosion resistance even in an environment with strong corrosion.
Detailed Description
For the convenience of understanding of those skilled in the art, the technical solution of the present invention is further specifically described below with reference to examples 1 to 3.
Example 1:
the chemical components by weight percentage are as follows: 0.15% of C, 0.5% of Si, 8.5% of Mn, 0.05% of P, 0.003% of S, 13% of Cr, 0.8% of Ni, 0.15% of N, 0.05% of Cu, 0.0025% of B, 13% of Mo, and the balance of Fe and a small amount of unavoidable impurities;
the manufacturing process of the nickel-saving austenitic stainless steel comprises the following steps:
step 1, AOD furnace smelting: sequentially adding 0.1 percent of C, 0.5 percent of Si, 9 percent of Mn, 13.5 percent of Cr, 0.8 percent of Ni, 0.15 percent of N, 13 percent of Mo and the balance of low-phosphorus molten steel scrap and high-carbon molten ferromanganese iron according to the weight percentage, and tapping at 1600-1650 ℃;
step 2, refining in an LF furnace: the station entering time is more than or equal to 60 min/furnace, the strong blowing time is more than or equal to 12min, the weak blowing time is more than or equal to 15min, the calming time is more than or equal to 15min, and the tapping temperature is 1550-1600 ℃;
step 3, continuous casting, namely continuously passing molten steel through a water-cooled crystallizer, condensing the molten steel into a hard shell, continuously pulling out the hard shell from an outlet below the crystallizer, cooling by spraying water, completely solidifying and cutting into blanks;
step 4, hot rolling and heating: the thickness of the plate blank is 180 mm-220 mm, the furnace entry temperature is 520-560 ℃, the preheating section temperature is 750-900 ℃, the heating time is 20min, the preheating section finishes entering a first heating section, the first heating section temperature is 1010-1050 ℃, the time is controlled at 45min, the first heating section finishes entering a second heating section, the second heating section temperature is 1165-1185 ℃, the time is controlled at 55min, the second heating section finishes entering a soaking section, the soaking section temperature is 1285-1295 ℃, the time is controlled at 40min, and the total heating time in the furnace is controlled at 160 min;
step 5, rough rolling: the first pass reduction rate is controlled to be 27.1 percent, the second pass reduction rate is controlled to be 32.1 percent, the third pass reduction rate is controlled to be 36.5 percent, the fourth pass reduction rate is controlled to be 32.3 percent, the fifth pass reduction rate is controlled to be 22.3 percent, the first pass and the third pass are descaled, and the descaling speed is 1.5 m/s;
step 6, finish rolling: and (3) removing scale by using steam while feeding water for finish rolling, wherein the inlet temperature of the finish rolling is 1020-1120 ℃, the outlet temperature of the finish rolling is more than 980 ℃, and the pass reduction rates of 8 finish rolling mills are respectively F1: 40.1 percent, 38.1 percent of F2, 35.1 percent of F3, 30.1 percent of F4, 25.2 percent of F5, 21.4 percent of F6, 19.1 percent of F7 and 15.2 percent of F8;
step 7, coiling: and (3) applying laminar cooling, wherein the coiling temperature is higher than 680 ℃, immediately stacking and slowly cooling the black skin coil after coiling, and uncoiling, thickness measuring and sampling can be carried out when the temperature is lower than 100 ℃.
Wherein, the step 3 is continuous casting: the target temperature versus target pull rate is as follows:
| fixed size | The temperature of the middle ladle is lower | Corresponding pulling speed/m/min |
| Three-ruler | 1470 | 1.21 |
| Four-ruler | 1470 | 1.21 |
| Five-ruler | 1475 | 1.05 |
Covering agent and crystallizer covering slag are coated in the tundish, and the using amount of the covering slag is controlled to be 0.4 kg/ton steel:
| tundish covering agent | Mold flux |
| Carbonized rice husk | LY～200 |
Example 2:
the difference compared to example 1 is:
step 4, hot rolling and heating: the thickness of the plate blank is 180 mm-220 mm, the furnace entry temperature is 520-560 ℃, the preheating section temperature is 750-900 ℃, the heating time is 25min, the preheating section finishes entering a first heating section, the first heating section temperature is 1010-1050 ℃, the time is controlled at 50min, the first heating section finishes entering a second heating section, the second heating section temperature is 1165-1185 ℃, the time is controlled at 60min, the second heating section finishes entering a soaking section, the soaking section temperature is 1285-1295 ℃, the time is controlled at 45min, and the total heating time in the furnace is controlled at 180 min;
step 5, rough rolling: the first pass rolling reduction is controlled to be 28.5 percent, the second pass rolling reduction is controlled to be 34.3 percent, the third pass rolling reduction is controlled to be 37.4 percent, the fourth pass rolling reduction is controlled to be 33.1 percent, the fifth pass rolling reduction is controlled to be 23.7 percent, the first pass rolling reduction and the third pass rolling reduction are carried out, and the descaling speed is 1.3 m/s;
step 6, finish rolling: and (3) removing scale by using steam while feeding water for finish rolling, wherein the inlet temperature of the finish rolling is 1020-1120 ℃, the outlet temperature of the finish rolling is more than 980 ℃, and the pass reduction rates of 8 finish rolling mills are respectively F1: 41.1 percent, 38.5 percent of F2, 36.1 percent of F3, 32.4 percent of F4, 27.5 percent of F5, 22.3 percent of F6, 19.5 percent of F7 and 17.1 percent of F8.
Wherein, the step 3 is continuous casting: the target temperature corresponds to the target pull rate as follows:
| fixed size | The temperature of the middle ladle is lower | Corresponding pulling speed/m/min |
| Three-ruler | 1475 | 1.22 |
| Four-ruler | 1476 | 1.22 |
| Five-ruler | 1478 | 1.08 |
Tundish covering agent and crystallizer covering slag:
the using amount of the covering slag is controlled to be 0.45 kg/ton steel
| Tundish covering agent | Mold flux |
| Carbonized rice husk | ST～SP200 |
Example 3:
the difference compared to example 1 is:
step 4, hot rolling and heating: the thickness of the plate blank is 180 mm-220 mm, the furnace entry temperature is 520-560 ℃, the temperature of the preheating section is 750-900 ℃, the heating time is 25min, the preheating section finishes entering a first heating section, the temperature of the first heating section is 1010-1050 ℃, the time is controlled at 55min, the first heating section finishes entering a second heating section, the temperature of the second heating section is 1165-1185 ℃, the time is controlled at 60min, the second heating section finishes entering a soaking section, the temperature of the soaking section is 1285-1295 ℃, the time is controlled at 50min, and the total heating time in the furnace is controlled at 190 min;
step 5, rough rolling: the first pass rolling reduction is controlled to be 29.5 percent, the second pass rolling reduction is controlled to be 35.3 percent, the third pass rolling reduction is controlled to be 38.4 percent, the fourth pass rolling reduction is controlled to be 33.1 percent, the fifth pass rolling reduction is controlled to be 23.7 percent, the first pass rolling reduction and the third pass rolling reduction are carried out, and the descaling speed is 1.6 m/s;
step 6, finish rolling: and (3) removing scale by using steam while feeding water for finish rolling, wherein the inlet temperature of the finish rolling is 1020-1120 ℃, the outlet temperature of the finish rolling is more than 980 ℃, and the pass reduction rates of 8 finish rolling mills are respectively F1: 42.1 percent, F2:39.2 percent, F3:37.1 percent, F4:33.4 percent, F5:28.5 percent, F6:22.3 percent, F7:20.8 percent and F8:18.1 percent.
Wherein, the step 3 is continuous casting: the target temperature versus target pull rate is as follows:
| fixed size | The temperature of the middle ladle is lower | Corresponding pulling speed/m/min |
| Three-ruler | 1478 | 1.25 |
| Four-ruler | 1478 | 1.22 |
| Five-ruler | 1468 | 1.05 |
Tundish covering agent and crystallizer covering slag:
the using amount of the covering slag is controlled to be 0.5 kg/ton steel
| Tundish covering agent | Mold flux |
| Carbonized rice husk | ST～SP200 |
Comparative example 1:
CN102943220B, a nickel-saving austenitic stainless steel and a manufacturing method thereof, the components of which by weight percentage are: less than 0.10 percent of C, less than or equal to 1.00 percent of Si, less than or equal to 12.0 percent of Mn with the concentration of 9.0 percent and less than or equal to 12.0 percent, less than or equal to 0.045 percent of S, less than or equal to 0.060 percent of P, less than or equal to 3.0 percent of Ni with the concentration of 1.0 percent and less than or equal to 3.0 percent, less than or equal to 16.0 percent of Cr with the concentration of 13.0 percent and less than or equal to 16.0 percent, less than or equal to 1.0 percent of Cu with the concentration of 0.1 percent and less than or equal to 1.0 percent, less than or equal to 0.2 percent of N, less than or equal to 30 multiplied by 10 percent of B～4％、20×10～4％≤Ca≤60×10～4Percent and the balance of Fe.
Comparative example 2:
the difference from example 1 is: the nickel-saving austenitic stainless steel does not contain molybdenum elements in chemical components, and the chemical elements comprise the following components in percentage by weight: 0.13% of C, 0.45% of Si, 8.7% of Mn, 0.05% of P, 0.003% of S, 9.7% of Cr, 0.6% of Ni, 0.14% of N, 0.25% of Cu, and 0.0025% of B.
Test example:
rolling a steel blank with the plate blank thickness of 200mm into steel coils, respectively sampling the stainless steel strip steel prepared by the four embodiments, respectively placing the stainless steel strip steel in a humid environment and a chloride-containing environment, and carrying out surface observation, wherein the following is a sample observation record table:
as described above, according to the present invention, by increasing the molybdenum element in the austenitic stainless steel to form the austenitic stainless steel containing chromium, nitrogen, and molybdenum, the corrosion resistance of the austenitic stainless steel can be further enhanced, and the austenitic stainless steel can exhibit excellent pitting corrosion resistance and crevice corrosion resistance even in an environment with high corrosion resistance.
The foregoing is merely exemplary and illustrative of the present invention and various modifications, additions and substitutions may be made by those skilled in the art to the specific embodiments described without departing from the scope of the present invention as defined in the accompanying claims.
Claims (5)
1. A nickel-saving austenitic stainless steel and a manufacturing process thereof are characterized in that the nickel-saving austenitic stainless steel comprises the following chemical components by weight percent: less than or equal to 0.15 percent of C, less than or equal to 0.5 percent of Si, less than or equal to 8.5 percent of Mn, less than or equal to 0.05 percent of P, less than or equal to 0.003 percent of S, less than or equal to 13 percent of Cr, less than or equal to 0.8 percent of Ni, less than or equal to 0.15 percent of N, less than or equal to 0.05 percent of Cu, less than or equal to 0.0025 percent of B, less than or equal to 13 percent of Mo, and the balance of Fe and a small amount of inevitable impurities;
the manufacturing process of the nickel-saving austenitic stainless steel comprises the following steps:
step 1, AOD furnace smelting: tapping temperature is 1600-1650 ℃;
step 2, refining in an LF furnace: tapping temperature is 1550-1600 ℃;
step 3, continuous casting, namely continuously passing molten steel through a water-cooled crystallizer, condensing the molten steel into a hard shell, continuously pulling out the hard shell from an outlet below the crystallizer, cooling by spraying water, completely solidifying and cutting into blanks;
step 4, hot rolling and heating: the thickness of the plate blank is 180 mm-220 mm, the furnace entry temperature is 520-560 ℃, the preheating section temperature is 750-900 ℃, the heating time is 20 min-30 min, the preheating section ends and enters a first heating section, the first heating section temperature is 1010-1050 ℃, the time is controlled to be 45 min-55 min, the first heating section ends and enters a second heating section, the second heating section temperature is 1165-1185 ℃, the time is controlled to be 55 min-65 min, the second heating section ends and enters a soaking section, the soaking section temperature is 1285-1295 ℃, the time is controlled to be 40 min-50 min, and the total heating time in the furnace is controlled to be 160 min-200 min;
step 5, rough rolling: the first pass rolling reduction is controlled to be 27.1-29.5%, the second pass rolling reduction is controlled to be 32.1-35.3%, the third pass rolling reduction is controlled to be 36.5-38.4%, the fourth pass rolling reduction is controlled to be 32.3-33.1%, the fifth pass rolling reduction is controlled to be 22.3-23.7%, the first and third passes of descaling are carried out, and the descaling speed is 0.8-1.8 m/s;
step 6, finish rolling: and (3) performing finish rolling by using water for feeding and simultaneously using steam for descaling, wherein the pass reduction rates of 8 finishing mills are respectively F1: 40.1 to 42.1 percent of F2, 38.1 to 39.2 percent of F2, 35.1 to 37.1 percent of F3, 30.1 to 33.4 percent of F4, 25.2 to 28.5 percent of F5, 21.4 to 22.3 percent of F6, 19.1 to 20.8 percent of F7 and 15.2 to 18.1 percent of F8;
step 7, coiling: and (3) applying laminar cooling, wherein the coiling temperature is higher than 680 ℃, immediately stacking and slowly cooling the black skin coil after coiling, and uncoiling, thickness measuring and sampling can be carried out when the temperature is lower than 100 ℃.
2. The nickel-saving austenitic stainless steel and the manufacturing process thereof according to the claim 1, characterized by the steps of 1, AOD furnace smelting: the chemical elements are added with less than or equal to 0.1 percent of C, less than or equal to 0.5 percent of Si, less than or equal to 9 percent of Mn, less than or equal to 13.5 percent of Cr, less than or equal to 0.8 percent of Ni, less than or equal to 0.15 percent of N, less than or equal to 13 percent of Mo, and the balance of low-phosphorus molten scrap iron and high-carbon molten ferromanganese iron according to weight percentage.
3. The nickel-saving austenitic stainless steel and the manufacturing process thereof according to the claim 1, characterized in that the step 2, LF furnace refining: the station-entering time is more than or equal to 60 min/furnace, the strong blowing time is more than or equal to 12min, the weak blowing time is more than or equal to 15min, and the calming time is more than or equal to 15 min.
4. The nickel-saving austenitic stainless steel and the manufacturing process thereof according to the claim 1, characterized by the steps of 3, continuous casting: target temperature corresponds to target pull rate: the specific size is three, the middle package temperature is 1468-1479 ℃, the corresponding pulling speed is 1.20-1.25 m/min, the specific size is four, the middle package temperature is 1468-1479 ℃, the corresponding pulling speed is 1.20-1.25 m/min, the specific size is five, the middle package temperature is 1468-1479 ℃, the corresponding pulling speed is 1.05-1.10 m/min, the usage amount of the crystallizer casting powder is controlled to be 0.4-0.5 kg/ton of steel, and the middle coating covering agent is carbonized rice husks.
5. The nickel-saving austenitic stainless steel and the manufacturing process thereof according to the claims 1 to 4, characterized by the steps of 6, finish rolling: the inlet temperature of finish rolling is 1020-1120 ℃, and the outlet temperature of finish rolling is more than 980 ℃.
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| CN115821172A (en) * | 2022-11-29 | 2023-03-21 | 山东泰山钢铁集团有限公司 | Austenitic stainless steel and smelting method thereof |
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