CN112921248A - Production method of high-toughness anti-layer-tearing Z-direction steel with thickness of 50mm - Google Patents
Production method of high-toughness anti-layer-tearing Z-direction steel with thickness of 50mm Download PDFInfo
- Publication number
- CN112921248A CN112921248A CN202110179391.8A CN202110179391A CN112921248A CN 112921248 A CN112921248 A CN 112921248A CN 202110179391 A CN202110179391 A CN 202110179391A CN 112921248 A CN112921248 A CN 112921248A
- Authority
- CN
- China
- Prior art keywords
- steel
- thickness
- tearing
- process parameters
- rolling
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
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
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
-
- 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
- C21D1/28—Normalising
-
- 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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
- C21D8/0257—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment with diffusion of elements, e.g. decarburising, nitriding
-
- 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
- C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
-
- 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
-
- 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
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- 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
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
-
- 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
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
Abstract
The invention discloses a method for producing Z-direction steel with a thickness of 50mm and high toughness and resistance to layer tearing, which comprises two parts of design of steelmaking component process parameters and design of steel rolling process parameters, and specifically comprises the following steps: 1) designing steel-making component process parameters: the thick-specification wind power steel Z-direction lamellar tearing resisting steel comprises the following components in percentage by weight: c0.14, Si 0.36, Mn 1.30, P0.014, S0.007, V0.016, Nb 0.018, Als 0.033, Ti 0.022 and Ca 0.002; 2) designing steel rolling technological parameters; the wind power steel plate with the thickness of 50mm produced by the method not only has good product performance, but also greatly reduces the production cost.
Description
Technical Field
The invention relates to a production method of Z-direction steel with a thickness of 50mm and high toughness and layer tearing resistance.
Background
In the rolling process of the steel plate, the thickness direction compression ratio is relatively reduced along with the increase of the plate thickness, and the mechanical properties of the steel plate in three directions are different: the performance along the rolling direction is best; the performance perpendicular to the rolling direction is slightly inferior: the performance in the thickness direction is inferior. The local delamination phenomenon is often difficult to avoid for steel rolled from general quality steel, especially for thick steel plates. The delamination mainly comes from the segregation of sulfur and phosphorus in the steel, non-metallic inclusions and other defects, and the defects influence the mechanical properties of the steel. The performance of the medium plate in the thickness direction needs to meet the national standard requirements of GB/T5313-2010 steel plate with performance in the thickness direction, wherein the length direction and the width direction of the steel plate in rolling are respectively X, Y and Z. With the continuous improvement of the technical requirements of structural steel, the requirements on the performance of the steel plate in the thickness direction are also met, the thicker the steel plate is, the more strict the requirements on the performance in the thickness direction are, the higher the lamellar tearing resistance of the steel plate in the thickness direction is, and therefore the requirements on the sulfur content, the hydrogen content, the oxygen content and the nitrogen content in the steel are stricter. T-shaped joints are often formed in the welding process, the steel plate bears the effect of larger Z-direction tensile stress during welding, and if the lamellar tearing resistance of the steel plate is poor, lamellar tearing can be generated at the parts to cause serious accidents. With the increase of the level of the power generation tower barrel established in the wind power industry, new requirements are provided for the thickness of the wind power steel plate, the thickness of the tower footing is increased, and the requirements for the high-toughness lamellar tearing-resistant steel plate with the thickness of 50mm are provided.
Disclosure of Invention
The invention aims to provide a production method of Z-direction steel with the thickness of 50mm and high toughness and anti-layer tearing, and the performance of a wind power steel plate with the thickness of 50mm is ensured by using the Z-direction steel to produce the wind power steel plate.
The method for producing the Z-direction steel with the thickness of 50mm and the high-toughness anti-layer tearing comprises two parts of design of steel-making component process parameters and design of steel rolling process parameters, and specifically comprises the following steps: 1) designing steel-making component process parameters: the thick-specification wind power steel Z-direction lamellar tearing resisting steel comprises the following components in percentage by weight: c0.14, Si 0.36, Mn 1.30, P0.014, S0.007, V0.016, Nb 0.018, Als 0.033, Ti 0.022 and Ca 0.002; 2) designing steel rolling technological parameters:
factors affecting the properties of steel include: chemical composition, smelting and casting, rolling, heat treatment and the like, and the chemical composition is mainly used. The main causes of lamellar tearing are the distribution and stress state of inclusions, while hydrogen (H) is the initiating and inducing factor. H in the steel is mainly water and combined water absorbed on surfaces of iron rust, silt, deoxidizing agent and other slagging materials on the surface of the scrap steel, and gas in a steel ladle and a tundish, and enters molten steel in the smelting and continuous casting processes. When hydrogen is less contained, the influence on the laminar tear is not large. However, when the H content is large, it is accumulated in the gaps of the inclusions to initiate cracks and spread, thereby detaching the inclusions from the base metal. When the H content in the weld is high, cold cracks are first formed. It can be used as the origin of lamellar tearing, which is accompanied by cold crack and plays the role of inducing lamellar tearing. The sulfur and phosphorus contents directly affect the properties of the steel sheet in the thickness direction. Sulphur and phosphorus are main impurities in steel, sulphur can generate easily-melted manganese sulfide, when the hot working or welding temperature reaches 800-1200 ℃, thermal cracks can occur, the manganese sulfide can form inclusions, the steel is promoted to be layered, stress concentration can be caused, and the plasticity and impact toughness of the steel are reduced. Phosphorus is dissolved in ferrite in the form of solid solution, which is very brittle, and the segregation of phosphorus is more severe than that of sulfur, and the formed phosphorus-rich zone promotes the embrittlement of steel, and reduces the plasticity, toughness and weldability of steel. Therefore, the control of Z-direction performance of wind power steel is key to the control of the contents of sulfur and phosphorus in the components.
The controlled rolling is generally divided into three stages, namely controlled rolling in an austenite recrystallization region, controlled rolling in an austenite non-recrystallization region and controlled rolling in an austenite and ferrite two-phase region, according to the difference between the recrystallization state of deformed austenite and the transformation mechanism in the steel rolling process. During rolling in a recrystallization zone, the pass reduction is increased as much as possible in a high-temperature zone, and the pass deformation is increased, so that the austenite recrystallization quantity is increased, and the grains are refined. During rolling in the unrecrystallized area, the steel does not have an austenite recrystallization process, and deformation causes austenite grains to be elongated and flattened and deformation zones to be formed in the grains. The transformed austenite grain boundary is a site where austenite preferentially nucleates when transforming to ferrite, and the elongated austenite grains prevent the ferrite grains from growing. As the deformation quantity is increased, the number of deformation zones in the crystal is increased, the distribution in the crystal is more uniform, and the deformation zones also provide nucleation sites during phase change, so that ferrite after phase change is finer and more uniform. During the two-phase region rolling, the austenite grains continue to be elongated by the deformation, new slip bands are formed inside the grains, and new ferrite nuclei are formed at these positions. And the deformation leads the interior of the ferrite crystal grains to be separated out firstly to form a large number of dislocations, the dislocations form a substructure at high temperature, the substructure improves the strength, and the brittle transition temperature is reduced. Rolling in the two-phase region, the substructure is the main cause of the rapid increase in strength.
The properties of Z-direction steel depend on a number of factors, of which hydrogen is one of the most influential, since the presence of hydrogen accelerates the formation of lamellar tears in the steel sheet, reducing the Z-direction properties. The higher the hydrogen content in the steel, the more serious the effect, and even the scrapping of the steel plate. In the steel rolling process, the rolled steel plate is stacked by a slow cooling box for heat preservation and slow cooling, the slow cooling temperature is 300-500 ℃, the slow cooling time is more than 36 hours, and hydrogen in the steel can be discharged outwards in a diffusion mode under certain conditions. The special performances of the thick-gauge Z-direction steel plate for resisting the lamellar tearing mainly comprise:
yield ratio and earthquake resistance: the earthquake protection device can resist the damage of certain earthquake force and has the earthquake protection and resistance.
Solderability: good welding performance, no need of preheating before welding and no need of heat treatment after welding.
Plasticity and toughness: the steel plate has good mechanical property, and brittle fracture of the steel plate is prevented.
Fourthly, resisting layered tearing: the welded beam and column joints have certain level of lamellar tearing resistance when being capable of bearing the tensile force along the plate thickness direction.
Ultrasonic nondestructive testing: the standard of national standard pressure-bearing equipment nondestructive testing I level is qualified.
The invention provides a method for researching a wind power steel product, which comprises the steps of looking up related data, researching a thick Z-direction lamellar tearing-resistant steel plate, designing and controlling production process parameters, continuously optimizing alloy components of the product, continuously improving steel making and rolling process research, and continuously carrying out practice verification and adjustment on special process parameters in the actual Z-direction lamellar tearing resistance development process to finally form a unique Z-direction lamellar tearing-resistant steel plate component of the wind power steel and a process system for producing the product.
By reasonably applying the method disclosed by the invention, the alloy component formula, the rolling process and the heat treatment normalizing process parameters of the product are optimized, so that a relatively stable mechanical property index is obtained, and the requirements of users are met.
The optimized design of the chemical components of the thick-specification anti-lamellar tearing wind power steel plate optimizes the element proportion in the alloy component formula, reduces the alloy cost, has stable product quality and realizes quantitative production; the optimization of the process path of the thick-specification anti-lamellar tearing wind power steel slightly reduces the strength of a small batch of products which are not extended in a rolling state after a heat treatment process, but greatly improves the elongation rate, so that the final mechanical property of the product is qualified, the degradation rate of change of the product is reduced, the possibility of contract removal and re-rolling of the product is avoided, the final cost of the product is further reduced, the competitiveness of the product in the market is further improved, and the foundation of price advantage is laid. The design of the process scheme of the thick-specification anti-lamellar tearing wind power steel reduces the quality loss controlled in the production process, reduces the quality loss cost and greatly improves the yield from the optimal design of the procedure process of steel making, medium plate rolling and heat treatment process due to the reasonable setting of process parameters; the technical scheme is implemented in a production field, and because the product is subjected to shot blasting treatment of heat treatment, the surface quality defect is eliminated, the risk of degradation of the strip steel due to the surface quality defect is reduced, the quality control strength of the product is effectively improved, and cost reduction and efficiency improvement work in cost management is facilitated.
Detailed Description
A production method of Z-direction steel with the thickness of 50mm and high toughness and layer tearing resistance comprises two parts of design of steel making component process parameters and design of steel rolling process parameters, and specifically comprises the following steps: 1) designing steel-making component process parameters: the thick-specification wind power steel Z-direction lamellar tearing resisting steel comprises the following components in percentage by weight: c0.14, Si 0.36, Mn 1.30, P0.014, S0.007, V0.016, Nb 0.018, Als 0.033, Ti 0.022 and Ca 0.002; 2) designing steel rolling technological parameters:
Claims (1)
1. a production method of Z-direction steel with the thickness of 50mm and high toughness and layer tearing resistance is characterized by comprising the following steps: the method comprises two parts of design of steelmaking component process parameters and design of steel rolling process parameters, and specifically comprises the following steps: 1) designing steel-making component process parameters: the thick-specification wind power steel Z-direction lamellar tearing resisting steel comprises the following components in percentage by weight: c0.14, Si 0.36, Mn 1.30, P0.014, S0.007, V0.016, Nb 0.018, Als 0.033, Ti 0.022 and Ca 0.002; 2) designing steel rolling technological parameters:
。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110179391.8A CN112921248A (en) | 2021-02-08 | 2021-02-08 | Production method of high-toughness anti-layer-tearing Z-direction steel with thickness of 50mm |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110179391.8A CN112921248A (en) | 2021-02-08 | 2021-02-08 | Production method of high-toughness anti-layer-tearing Z-direction steel with thickness of 50mm |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112921248A true CN112921248A (en) | 2021-06-08 |
Family
ID=76171400
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110179391.8A Pending CN112921248A (en) | 2021-02-08 | 2021-02-08 | Production method of high-toughness anti-layer-tearing Z-direction steel with thickness of 50mm |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112921248A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5658948A (en) * | 1979-10-15 | 1981-05-22 | Nippon Steel Corp | Structural steel with enhanced z-direction crack resistance |
| JPS5861224A (en) * | 1981-10-07 | 1983-04-12 | Kobe Steel Ltd | Production of strong and tough non-refined steel plate |
| JP2009191278A (en) * | 2008-02-12 | 2009-08-27 | Sumitomo Metal Ind Ltd | High strength thick steel plate having excellent arrest property in z direction, and method for producing the same |
| CN101994058A (en) * | 2010-12-10 | 2011-03-30 | 武汉钢铁(集团)公司 | Quake-proof construction steel with lamellar tearing resistance and excellent performance and production method thereof |
| CN102041432A (en) * | 2010-12-21 | 2011-05-04 | 南阳汉冶特钢有限公司 | Q420GJD-Z35 steel plate with thickness of less than or equal to 60 millimeters for high-rise building and production method thereof |
| CN102534383A (en) * | 2012-03-01 | 2012-07-04 | 首钢总公司 | High-tenacity steel plate for ocean engineering and manufacturing method thereof |
-
2021
- 2021-02-08 CN CN202110179391.8A patent/CN112921248A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5658948A (en) * | 1979-10-15 | 1981-05-22 | Nippon Steel Corp | Structural steel with enhanced z-direction crack resistance |
| JPS5861224A (en) * | 1981-10-07 | 1983-04-12 | Kobe Steel Ltd | Production of strong and tough non-refined steel plate |
| JP2009191278A (en) * | 2008-02-12 | 2009-08-27 | Sumitomo Metal Ind Ltd | High strength thick steel plate having excellent arrest property in z direction, and method for producing the same |
| CN101994058A (en) * | 2010-12-10 | 2011-03-30 | 武汉钢铁(集团)公司 | Quake-proof construction steel with lamellar tearing resistance and excellent performance and production method thereof |
| CN102041432A (en) * | 2010-12-21 | 2011-05-04 | 南阳汉冶特钢有限公司 | Q420GJD-Z35 steel plate with thickness of less than or equal to 60 millimeters for high-rise building and production method thereof |
| CN102534383A (en) * | 2012-03-01 | 2012-07-04 | 首钢总公司 | High-tenacity steel plate for ocean engineering and manufacturing method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP6198937B2 (en) | HT550 steel sheet with ultra-high toughness and excellent weldability and method for producing the same | |
| JP6211170B2 (en) | Zinc-resistant induction cracked steel sheet and manufacturing method thereof | |
| CN103510003B (en) | A kind of large diameter pipeline Chinese People's Anti-Japanese Military and Political College is out of shape heterogeneous X100 High Strength Steel Plate and manufacture method thereof | |
| CN110195193B (en) | 800 MPa-grade quenched and tempered steel plate with low cost, high toughness and excellent weldability and manufacturing method thereof | |
| CN108624819B (en) | Low-cost large-heat-input welding 460 MPa-grade crack arrest steel plate and manufacturing method thereof | |
| CN112877601A (en) | Marine steel plate with excellent low-temperature toughness and low yield ratio and manufacturing method thereof | |
| CN102732797B (en) | 800MPa grade low welding crack sensitivity steel plate and its manufacturing method | |
| CN111926253A (en) | Hydrogen sulfide corrosion resistant high-strength toughness normalized steel and manufacturing method thereof | |
| KR20220131991A (en) | 355MPa class low-temperature hot-rolled H-beam steel for marine engineering and manufacturing method thereof | |
| KR20230172017A (en) | Corrosion-resistant high-strength steel plate for marine engineering capable of high heat input welding and method of manufacturing the same | |
| CN113862557A (en) | Ferrite pearlite type Q345qD bridge steel extra-thick plate and manufacturing method thereof | |
| CN111378893A (en) | Hot-rolled steel plate for longitudinal welded pipe with yield strength of 290MPa | |
| CN115141969A (en) | Production method of 800MPa grade hydropower steel | |
| CN112553524A (en) | Hot rolled steel plate with yield strength of 360MPa for pipeline and manufacturing method thereof | |
| CN109234487B (en) | Production method of submarine pipeline steel X65MO | |
| CN110284066A (en) | A kind of thin gauge low-yield ratio pipeline steel and its manufacturing method | |
| CN101050504A (en) | Soldering not quenching and tempering steel plate in high intensity by large line energy, and manufacturing method | |
| CN113737088B (en) | 800 MPa-grade steel plate with low yield ratio, high toughness and high weldability and manufacturing method thereof | |
| CN105772666A (en) | Center segregation control method for 30 CrMo circular tube blank and steel casting blank | |
| CN103667921A (en) | Thick steel plate with high strength and toughness as well as uniform performance in thickness direction and production method of thick steel plate | |
| CN110004364B (en) | Large loading stress sulfide corrosion resistant X52MS hot-rolled plate coil and manufacturing method thereof | |
| CN112746219A (en) | YP500 MPa-grade steel plate with low yield ratio, high toughness and high weldability and manufacturing method thereof | |
| CN112921248A (en) | Production method of high-toughness anti-layer-tearing Z-direction steel with thickness of 50mm | |
| CN113699462B (en) | Hot-rolled steel strip for 750 MPa-grade continuous oil pipe and manufacturing method thereof | |
| CN111676424B (en) | Large-piece-weight super-thick steel for offshore wind power and production method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20210608 |
|
| WD01 | Invention patent application deemed withdrawn after publication |