CN118023291A - Preparation process of high-carbon martensitic stainless steel hot-rolled product - Google Patents
Preparation process of high-carbon martensitic stainless steel hot-rolled product Download PDFInfo
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- CN118023291A CN118023291A CN202410301481.3A CN202410301481A CN118023291A CN 118023291 A CN118023291 A CN 118023291A CN 202410301481 A CN202410301481 A CN 202410301481A CN 118023291 A CN118023291 A CN 118023291A
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- 229910001105 martensitic stainless steel Inorganic materials 0.000 title claims abstract description 48
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 44
- 238000002360 preparation method Methods 0.000 title claims abstract description 16
- 238000005096 rolling process Methods 0.000 claims abstract description 39
- 238000005422 blasting Methods 0.000 claims abstract description 28
- 238000000137 annealing Methods 0.000 claims abstract description 25
- 238000000034 method Methods 0.000 claims abstract description 14
- 238000003466 welding Methods 0.000 claims abstract description 10
- 238000004519 manufacturing process Methods 0.000 claims abstract description 9
- 229910000831 Steel Inorganic materials 0.000 claims description 37
- 239000010959 steel Substances 0.000 claims description 37
- 239000002253 acid Substances 0.000 claims description 32
- 238000005406 washing Methods 0.000 claims description 22
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 20
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 10
- 238000001816 cooling Methods 0.000 claims description 10
- 230000007704 transition Effects 0.000 claims description 7
- 238000001035 drying Methods 0.000 claims description 5
- 229910001220 stainless steel Inorganic materials 0.000 claims description 5
- 239000010935 stainless steel Substances 0.000 claims description 5
- 239000002436 steel type Substances 0.000 claims description 2
- 239000000047 product Substances 0.000 abstract description 29
- 238000005554 pickling Methods 0.000 abstract description 11
- 238000005097 cold rolling Methods 0.000 abstract description 3
- 239000013067 intermediate product Substances 0.000 abstract description 2
- 239000010963 304 stainless steel Substances 0.000 description 3
- 229910000589 SAE 304 stainless steel Inorganic materials 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000005098 hot rolling Methods 0.000 description 1
- 235000008373 pickled product Nutrition 0.000 description 1
Classifications
-
- 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
- B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B15/0085—Joining ends of material to continuous strip, bar or sheet
-
- 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
- B21B45/04—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 de-scaling, e.g. by brushing
- B21B45/06—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 de-scaling, e.g. by brushing of strip material
-
- 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
-
- 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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
- C21D9/54—Furnaces for treating strips or wire
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G3/00—Apparatus for cleaning or pickling metallic material
- C23G3/02—Apparatus for cleaning or pickling metallic material for cleaning wires, strips, filaments continuously
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B2015/0092—Welding in the rolling direction
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Heat Treatment Of Sheet Steel (AREA)
- Heat Treatment Of Steel (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
Abstract
The invention provides a preparation process of a high-carbon martensitic stainless steel hot rolled product, which optimizes the surface of the hot rolled product by welding, online rolling, online annealing, online descaling, online shot blasting and online pickling of a covered high-carbon martensitic stainless steel black coil, obtains a process intermediate product with thinner oxide skin, reduces rolling risk for subsequent cold rolling, improves the plate shape of the martensitic stainless steel after cover annealing, improves pickling efficiency, has low cost and stable production process, and the prepared thin hot rolled product meets target requirements and has high product quality.
Description
Technical Field
The invention relates to the technical field of martensitic stainless steel preparation, in particular to a preparation process of a high-carbon martensitic stainless steel hot-rolled product.
Background
The martensitic stainless steel is high-quality stainless steel with good corrosion resistance, high hardness, wear resistance and the like can be obtained after heat treatment, a black coil hot-rolled to a target thickness of a hot-rolled pickled product has certain plasticity after being covered and removed, and the hot-rolled product can be obtained for direct delivery or further cold-rolled 2B product delivery after being pickled by a continuous pickling line. .
The high-carbon martensitic stainless steel contains higher carbon and chromium elements, has excellent mechanical properties and corrosion resistance, but is difficult to roll to the target common hot-rolled thickness of a thin hot-rolled product by using the traditional process due to large rolling load, or can be annealed and pickled to obtain the finished product after being rolled by a single-frame cold rolling mill. If the cold-rolled product is required to be produced subsequently, the finished product can be produced after the thick hot-rolled product is subjected to cold rolling and annealing for many times, and the pickled oxide skin is compact after the pickling is finished, so that the pickling efficiency is low, and even the pickling times are increased to produce a qualified product, the rolling risk is high, and the production efficiency is low and the cost is high.
Disclosure of Invention
The invention provides a preparation process of a high-carbon martensitic stainless steel hot-rolled product, and aims to solve the problems of low efficiency and high cost when the high-carbon martensitic stainless steel thin-specification hot-rolled product is produced by adopting the traditional preparation process of the martensitic stainless steel hot-rolled product.
In order to achieve the purpose, the invention adopts the following technical scheme:
A preparation process of a high-carbon martensitic stainless steel hot-rolled product comprises the following steps:
step one: welding; uncoiling the high-carbon martensitic stainless steel black roll with the cover removed, then welding the head part of the high-carbon martensitic stainless steel black roll with the 300 series stainless steel transition zone, and welding the tail part of the high-carbon martensitic stainless steel black roll with the same steel type with the cover removed or the 300 series stainless steel transition zone;
step two: rolling on line; the welded strip steel weld joint runs and stays at an outlet of an online six-roller mill, the rolling length of the head and the tail is ensured to be 3-6 meters, and online six-roller rolling is started;
Step three: annealing on line; the strip steel subjected to online rolling enters an online annealing furnace for annealing;
Step four: on-line descaling; the annealed strip steel enters a scale breaking straightening machine to break scales and straighten, and the rolling reduction is controlled to reach the elongation of 0.1-0.2%;
Step five: performing online shot blasting; the strip steel after the descaling enters a shot blasting machine to remove oxide skin;
Step six: carrying out on-line acid washing; the strip steel after shot blasting enters an acid washing section for acid washing, and an acid washing method of sulfuric acid and mixed acid (HNO 3 and HF) is adopted;
Step seven: downloading; rinsing, drying and coiling the strip steel subjected to acid washing to obtain the high-carbon martensitic stainless steel hot-rolled product.
Preferably, the high carbon martensitic stainless steel is 50Cr13, 65Cr13 or 70Cr13Mo steel, the width is 500-1500mm, and the thickness is 3.5-5.0mm.
Preferably, the rolling reduction in the second step is 5% -30%.
Preferably, the annealing temperature in the third step is 700-750 ℃, the process speed is 20-40m/min, and the cooling mode is air cooling.
Preferably, in the fifth step, the shot blasting speed is 72-76m/s, and the shot blasting flow is 11-14kg/m 3.
Preferably, in the step six, the sulfuric acid temperature is 70-80 ℃ and the concentration is 220-250g/L; the temperature of the mixed acid (HNO 3 and HF) is 30-35 ℃, wherein the concentration of HNO 3 is 20-30g/L, and the concentration of HF is 3-5g/L.
The high-carbon martensitic stainless steel strip prepared by the preparation process is prepared.
Compared with the prior art, the invention has the beneficial effects that:
1. according to the preparation process of the high-carbon martensitic stainless steel hot rolled product, the covered high-carbon martensitic stainless steel black coil is welded, rolled on line, annealed on line, broken on line, shot blasting and pickling on line, the surface of the hot rolled product is optimized, the plate shape of the martensitic stainless steel after cover annealing is improved, the thickness of the high-carbon martensitic stainless steel black coil is greatly reduced, the process speed is increased from 10-15m/min to 20-40m/min, and the pickling efficiency is greatly improved.
2. The preparation process provided by the invention has the advantages that online rolling, annealing, descaling and shot blasting steps are added, the defect that the traditional process adopts original thickness to directly acid-wash to cause thicker finished products and cannot produce thin-specification hot rolled products is overcome, the oxide skin of the intermediate product obtained by adopting the preparation process is thinner, the acid-wash is facilitated, the subsequent rolling risk is reduced, the cost is low, the production process is stable, and the thin-specification hot rolled products meeting the target requirements can be obtained, and the finished product quality is high.
Drawings
FIG. 1 is a drawing showing a 65Cr13 high carbon martensitic stainless steel strip product obtained in example 1 of the present invention.
Detailed Description
The invention is further illustrated by the following examples:
Example 1
The invention relates to a preparation process of a high-carbon martensitic stainless steel hot-rolled product, which comprises the following steps:
Step one: welding; the 50Cr13 high-carbon martensitic stainless steel black coil after being covered and retracted has the width of 1250mm and the thickness of 4.75mm, and after being uncoiled, the head part of the black coil is welded with a 304 stainless steel transition zone, and the tail part of the black coil is welded with the 50Cr13 high-carbon martensitic stainless steel black coil with the same steel grade after being covered and retracted;
Step two: rolling on line; the welded strip steel weld joint is kept at an outlet of an online six-roller mill, the rolling length of the head and the tail is ensured to be 5 meters, online six-roller rolling is started, the rolling reduction is 25%, and the target thickness after rolling is 3.55mm;
Step three: annealing on line; the strip steel subjected to online rolling enters an online annealing furnace for annealing, wherein the annealing temperature is 750 ℃, the process speed is 40m/min, and the cooling mode is air cooling;
Step four: on-line descaling; the annealed strip steel enters a scale breaking straightening machine to break scales and straighten, and the rolling reduction is controlled to reach the elongation of 0.2%;
Step five: performing online shot blasting; the strip steel after descaling enters a shot blasting machine to remove oxide skin, the shot blasting speed is 72m/s, and the shot blasting flow is 14kg/m 3;
Step six: carrying out on-line acid washing; the strip steel after shot blasting enters an acid washing section for acid washing, and an acid washing method of sulfuric acid and mixed acid (HNO 3 and HF) is adopted, wherein the temperature of the sulfuric acid is 70 ℃, and the concentration is 220g/L; the temperature of the mixed acid (HNO 3 plus HF) is 33 ℃, wherein the concentration of HNO 3 is 22g/L, and the concentration of HF is 3g/L;
Step seven: downloading; rinsing, drying and coiling the strip steel after pickling, and taking off the strip steel to obtain the hot-rolled qualified 50Cr13 high-carbon martensitic stainless steel strip with the thickness of 3.5mm shown in figure 1.
Example 2
The invention relates to a preparation process of a high-carbon martensitic stainless steel hot-rolled product, which comprises the following steps:
Step one: welding; the covered and unwound 65Cr13 high-carbon martensitic stainless steel black coil has the width of 500mm and the thickness of 4.2mm, and the head and the tail of the black coil are welded with a 304 stainless steel transition zone after being uncoiled;
Step two: rolling on line; the welded strip steel weld joint is kept at an outlet of an online six-roller mill, the rolling length of the head and the tail is ensured to be 6 meters, online six-roller rolling is started, the rolling reduction is 15%, and the target thickness after rolling is 3.55mm;
step three: annealing on line; the strip steel subjected to online rolling enters an online annealing furnace for annealing, wherein the annealing temperature is 730 ℃, the process speed is 20m/min, and the cooling mode is air cooling;
step four: on-line descaling; the annealed strip steel enters a scale breaking straightening machine to break scales and straighten, and the rolling reduction is controlled to reach the elongation of 0.1%;
step five: performing online shot blasting; the strip steel after descaling enters a shot blasting machine to remove oxide skin, the shot blasting speed is 74m/s, and the shot blasting flow is 11kg/m 3;
Step six: carrying out on-line acid washing; the strip steel after shot blasting enters an acid washing section for acid washing, and an acid washing method of sulfuric acid and mixed acid (HNO 3 and HF) is adopted, wherein the temperature of the sulfuric acid is 77 ℃, and the concentration is 240g/L; the temperature of the mixed acid (HNO 3 plus HF) is 30 ℃, wherein the concentration of HNO 3 is 27g/L, and the concentration of HF is 4g/L;
Step seven: downloading; rinsing, drying and coiling the strip steel after pickling, and taking off the strip steel to obtain the 65Cr13 high-carbon martensitic stainless steel strip with the thickness of 3.5mm which is qualified after hot rolling.
Example 3
The invention relates to a preparation process of a high-carbon martensitic stainless steel hot-rolled product, which comprises the following steps:
Step one: welding; the 70Cr13Mo high-carbon martensitic stainless steel black coil after being covered and uncovered has the width of 1500mm and the thickness of 5.0mm, and after being uncoiled, the head part of the black coil is welded with a 304 stainless steel transition zone, and the tail part of the black coil is welded with the 70Cr13Mo high-carbon martensitic stainless steel black coil with the same steel grade after being covered and uncovered;
step two: rolling on line; the welded strip steel weld joint is kept at an outlet of an online six-roller mill, the rolling length of the head and the tail is ensured to be 6 meters, online six-roller rolling is started, the rolling reduction is 10%, and the target thickness after rolling is 4.05mm;
step three: annealing on line; the strip steel subjected to online rolling enters an online annealing furnace for annealing, wherein the annealing temperature is 700 ℃, the process speed is 25m/min, and the cooling mode is air cooling;
step four: on-line descaling; the annealed strip steel enters a scale breaking straightening machine to break scales and straighten, and the rolling reduction is controlled to reach the elongation of 0.1%;
step five: performing online shot blasting; the strip steel after descaling enters a shot blasting machine to remove oxide skin, the shot blasting speed is 76m/s, and the shot blasting flow is 12kg/m 3;
Step six: carrying out on-line acid washing; the strip steel after shot blasting enters an acid washing section for acid washing, and an acid washing method of sulfuric acid and mixed acid (HNO 3 and HF) is adopted, wherein the temperature of the sulfuric acid is 80 ℃, and the concentration is 250g/L; the temperature of the mixed acid (HNO 3 plus HF) is 35 ℃, wherein the concentration of HNO 3 is 30g/L, and the concentration of HF is 5g/L;
step seven: downloading; rinsing, drying and coiling the strip steel after pickling, and taking off the strip steel to obtain the qualified 70Cr13Mo high-carbon martensitic stainless steel strip with the thickness of 4.0 mm.
Claims (7)
1. The preparation process of the high-carbon martensitic stainless steel hot rolled product is characterized by comprising the following steps of:
step one: welding; uncoiling the high-carbon martensitic stainless steel black roll with the cover removed, then welding the head part of the high-carbon martensitic stainless steel black roll with the 300 series stainless steel transition zone, and welding the tail part of the high-carbon martensitic stainless steel black roll with the same steel type with the cover removed or the 300 series stainless steel transition zone;
step two: rolling on line; the welded strip steel weld joint runs and stays at an outlet of an online six-roller mill, the rolling length of the head and the tail is ensured to be 3-6 meters, and online six-roller rolling is started;
Step three: annealing on line; the strip steel subjected to online rolling enters an online annealing furnace for annealing;
Step four: on-line descaling; the annealed strip steel enters a scale breaking straightening machine to break scales and straighten, and the rolling reduction is controlled to reach the elongation of 0.1-0.2%;
Step five: performing online shot blasting; the strip steel after the descaling enters a shot blasting machine to remove oxide skin;
Step six: carrying out on-line acid washing; the strip steel after shot blasting enters an acid washing section for acid washing, and an acid washing method of sulfuric acid and mixed acid (HNO 3 and HF) is adopted;
Step seven: downloading; rinsing, drying and coiling the strip steel subjected to acid washing to obtain the high-carbon martensitic stainless steel hot-rolled product.
2. The process for preparing a hot rolled high carbon martensitic stainless steel product according to claim 1, wherein: the high-carbon martensitic stainless steel is 50Cr13, 65Cr13 or 70Cr13Mo steel, the width is 500-1500mm, and the thickness is 3.5-5.0mm.
3. The process for preparing a hot rolled high carbon martensitic stainless steel product according to claim 2, wherein: the rolling reduction rate in the second step is 5% -30%.
4. The process for preparing a hot rolled high carbon martensitic stainless steel product according to claim 2, wherein: and step three, the annealing temperature is 700-750 ℃, the process speed is 20-40m/min, and the cooling mode is air cooling.
5. The process for preparing a hot rolled high carbon martensitic stainless steel product according to claim 2, wherein: and step five, the shot blasting speed is 72-76m/s, and the shot blasting flow is 11-14kg/m 3.
6. The process for preparing a hot rolled high carbon martensitic stainless steel product according to claim 2, wherein: the temperature of the sulfuric acid in the step six is 70-80 ℃ and the concentration is 220-250g/L; the temperature of the mixed acid (HNO 3 and HF) is 30-35 ℃, wherein the concentration of HNO 3 is 20-30g/L, and the concentration of HF is 3-5g/L.
7. A high carbon martensitic stainless steel strip prepared by the process for preparing a hot rolled high carbon martensitic stainless steel product according to any one of claims 1 to 6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410301481.3A CN118023291A (en) | 2024-03-16 | 2024-03-16 | Preparation process of high-carbon martensitic stainless steel hot-rolled product |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202410301481.3A CN118023291A (en) | 2024-03-16 | 2024-03-16 | Preparation process of high-carbon martensitic stainless steel hot-rolled product |
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| CN202410301481.3A Pending CN118023291A (en) | 2024-03-16 | 2024-03-16 | Preparation process of high-carbon martensitic stainless steel hot-rolled product |
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