CN112522602A - Chromium-free molybdenum hot-rolled steel strip for H2S corrosion resistant L360MS spiral welded pipe and manufacturing method thereof - Google Patents
Chromium-free molybdenum hot-rolled steel strip for H2S corrosion resistant L360MS spiral welded pipe and manufacturing method thereof Download PDFInfo
- Publication number
- CN112522602A CN112522602A CN202011126200.3A CN202011126200A CN112522602A CN 112522602 A CN112522602 A CN 112522602A CN 202011126200 A CN202011126200 A CN 202011126200A CN 112522602 A CN112522602 A CN 112522602A
- Authority
- CN
- China
- Prior art keywords
- equal
- less
- percent
- steel strip
- rolled steel
- 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
Images
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
- B21B1/46—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
- B21B1/463—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 continuous process, i.e. the cast not being cut before rolling
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/06—Deoxidising, e.g. killing
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/10—Handling in a vacuum
-
- 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
- C22C33/06—Making ferrous alloys by melting using master alloys
-
- 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
- C22C38/04—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
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2201/00—Special rolling modes
- B21B2201/06—Thermomechanical rolling
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
The invention discloses a chromium-free molybdenum hot-rolled steel strip for H2S corrosion resistant L360MS spiral welded pipes and a manufacturing method thereof, wherein the steel comprises the following chemical components in percentage by mass: less than or equal to 0.06 percent of C, less than or equal to 0.20 percent of Si, less than or equal to 1.25 percent of Mn, less than or equal to 0.040 percent of Nb, less than or equal to 0.020 percent of Ti, less than or equal to 0.035 percent of Alt, less than or equal to 0.015 percent of P, less than or equal to 0.0020 percent of S, less than or equal to 0.0002 percent of H, less than or equal to 0.0030 percent of O, less than or equal to 0. The steel has excellent performance and small fluctuation, the yield strength Rt0.5 is 460-500 MPa, the tensile strength Rm is 530-560 MPa, the elongation A50 is more than or equal to 35%, the Charpy impact power Akv at minus 20 ℃ is more than or equal to 250J, and the steel has excellent HIC and SSC resistance and low-temperature fracture toughness.
Description
Technical Field
The invention relates to the technical field of high-purity low-alloy high-strength steel products at the outlet, in particular to a hot-rolled steel strip for a chromium-free molybdenum H2S corrosion-resistant L360MS spiral welding pipe and a manufacturing method thereof.
Background
The H2S gas dried at normal temperature and normal pressure has no corrosive effect on metals, but the hydrogen sulfide is dissolved in water to form a wet hydrogen sulfide environment to contact with the metals, so that the corrosion damage is caused, the oil and gas field development and the normal production of petroleum processing enterprises are influenced, even catastrophic accidents are caused, and serious casualties and property loss are caused. The pipeline steel resisting H2S corrosion is mainly used for conveying substances such as crude oil, finished oil, natural gas, water, coal gas and the like rich in H2S/CO2 acidic medium.
Along with the annual reduction of global easy-to-recover resources, severe environment oil and gas fields such as marginal oil and gas fields, polar oil and gas fields, offshore oil and gas fields, acid oil and gas fields and the like are urgently developed, and the subsequent oil and gas pipeline engineering faces the challenges of high-pressure transportation and severe environments such as low temperature, large displacement, deep sea, acid medium and the like. Correspondingly, the steel product with the characteristics of low temperature resistance, large deformation resistance, high hydrogen sulfide corrosion resistance and the like is the main development trend of the pipeline steel product.
1. The first document is a production process for seamless oil jacket steel pipes, and needs heat treatment state delivery, while the patent is suitable for producing L320MS/X46MS acid-resistant pipeline steel hot-rolled steel strips for welded pipes, can be used for manufacturing oil and gas conveying pipes, and has different manufacturing processes and product purposes; the hot rolled steel strip has simple manufacturing process and lower cost than a seamless steel tube in pipe welding and pipe making, so the development of the pipeline steel hot rolled steel strip with the function of hydrogen sulfide corrosion resistance has wider applicability and stronger practicability.
2. The second document is the production of a large-thickness hydrogen sulfide resistant steel plate, which has great difference from the patent in component design and production process, and the patent is suitable for the production of small-thickness hot rolled steel strips, and the yield strength range is 320-400 MPa. The low-carbon microalloy component design is adopted, the alloy cost is low, the ultralow-sulfur control capability of the low-carbon microalloy component design reaches the international advanced level, and higher guarantee is provided for the low-power quality and the hydrogen resistance of a casting blank.
3. The third document is a hot rolled steel strip for a hydrogen sulfide corrosion-resistant welding pipe of L290M/X42MS grade and a manufacturing method thereof, while the third document is applicable to the manufacturing method of the hot rolled steel strip for the hydrogen sulfide corrosion-resistant welding pipe of L320M/X46MS grade, and the brands of the hot rolled steel strip and the manufacturing method are different; the patent avoids the addition of noble metals, and the design of low-carbon + Ti + Cr alloy components greatly reduces the manufacturing cost of products.
Disclosure of Invention
The invention aims to provide a hot rolled steel strip for L360MS pipeline steel for a spiral welding pipe with excellent HIC (hydrogen induced cracking) resistance and SSC (stress cracking) resistance and a manufacturing method thereof.
In order to solve the technical problems, the invention adopts the following technical scheme:
the invention relates to a chromium-free molybdenum hot-rolled steel strip for H2S corrosion resistant L360MS spiral welded pipes, which comprises the following components in percentage by mass: less than or equal to 0.06 percent of C, less than or equal to 0.20 percent of Si, less than or equal to 1.25 percent of Mn, less than or equal to 0.040 percent of Nb, less than or equal to 0.020 percent of Ti, less than or equal to 0.035 percent of Alt, less than or equal to 0.015 percent of P, less than or equal to 0.0020 percent of S, less than or equal to 0.0002 percent of H, less than or equal to 0.0030 percent of O, less than or equal to 0.
The manufacturing method comprises the following steps:
the smelting continuous casting process comprises the following steps: KR desulfurization treatment is carried out on the smelted molten iron, the sulfur content of the smelted molten iron fed into a converter is required to be less than or equal to 0.002 percent, and the cleaning area of desulfurized slag is more than 95 percent; the tapping temperature is more than or equal to 1620 ℃, and the coordination of the components and the temperature is ensured for tapping; if a new steel tapping hole or an abnormal turnover ladle is not formed, the steel tapping temperature is increased by 10-15 ℃ on the basis of the upper limit; adding aluminum iron, ferrosilicon and ferromanganese into the converter steel tapping process for deoxidation alloying; slagging and desulfurizing in an LF furnace, and adding aluminum iron, ferrosilicon, ferromanganese and ferroniobium to adjust to a target component range; the vacuum degree requirement of the RH procedure is less than or equal to 2.6mbar, the vacuum maintaining time is more than or equal to 15min, and the circulating pure degassing time is ensured to be more than or equal to 7 min; measuring temperature and sampling during RH vacuum treatment, and adding ferrotitanium alloy according to the components of molten steel to adjust to target components; calcium treatment is carried out after RH vacuum treatment is finished, soft blowing time is ensured to be more than 8min after wire feeding, and molten steel is prevented from being exposed;
the slab reheating and rolling process comprises the following steps: the thickness of the continuous casting billet is 230mm, the continuous casting billet is heated to be less than or equal to 1200 ℃ by a stepping heating furnace and discharged, then the continuous casting billet is subjected to two-stage controlled rolling by a rough rolling unit and a finishing rolling unit, the intermediate billet is less than or equal to 50mm, the finish rolling temperature is less than or equal to 1050 ℃, the finish rolling temperature is less than or equal to 865 ℃, and then a front dispersion laminar cooling mode is adopted for coiling at the temperature of less than or equal to 600 ℃.
Further, the hot-rolled steel strip comprises the following components in percentage by mass: less than or equal to 0.06 percent of C, less than or equal to 0.20 percent of Si, less than or equal to 1.25 percent of Mn, less than or equal to 0.040 percent of Nb, less than or equal to 0.020 percent of Ti, less than or equal to 0.035 percent of Alt, less than or equal to 0.015 percent of P, less than or equal to 0.0020 percent of S, less than or equal to 0.0002 percent of H, less than or equal to 0.0030 percent of O, less than or equal to 0.
Further, the hot-rolled steel strip comprises the following components in percentage by mass: 0.05% of C, 0.16% of Si, 1.22% of Mn1, 0.038% of Nb0.014% of Ti0.014%, Alt0.026%, 0.012% of P, 0.002% of S, less than or equal to 0.0.0002% of H, less than or equal to 0.0020% of O, 0.0040% of N, and the balance of Fe and inevitable impurities.
Further, the hot-rolled steel strip comprises the following components in percentage by mass: 0.05 percent of C, 0.15 percent of Si, 1.20 percent of Mn1, 0.034 percent of Nb0.015 percent of Ti0.015 percent of Alt0.026 percent of P, 0.012 percent of S, less than or equal to 0.0.0002 percent of H, less than or equal to 0.0020 percent of O, 0.0040 percent of N, and the balance of Fe and inevitable impurities.
Further, the hot-rolled steel strip comprises the following components in percentage by mass: 0.05% of C, 0.16% of Si, 1.24% of Mn1, 0.036% of Nb0.036% of Ti0.014%, Alt0.027%, 0.011% of P, 0.002% of S, less than or equal to 0.0.0002% of H, less than or equal to 0.0020% of O, 0.0040% of N, and the balance of Fe and inevitable impurities.
Furthermore, the initial rolling temperature of finish rolling is less than or equal to 1020 ℃.
Further, coiling is carried out at the temperature of less than or equal to 560 ℃.
The main elements are selected for the following reasons:
c: the content of C in the steel is easy to segregate elements, which can aggravate the segregation of central carbides of casting blanks, pearlite banded structures are easy to form after rolling, and the hydrogen-induced cracking resistance of steel is seriously influenced, so the design idea of adopting low-carbon components is a design basis for removing precious metals Mo and Cr to ensure that products still have certain H2S corrosion resistance, and the content of carbon is controlled to be less than or equal to 0.06 percent.
Si: deoxidizing element, which is solid-dissolved in ferrite to improve the strength of steel, but loses plasticity and toughness, the Si content is controlled to be 0.10-0.20%.
Mn: manganese can be infinitely replaced and dissolved with iron, is a good solid solution strengthening element, but for the hydrogen sulfide resistance, manganese is easily enriched in the center of a casting blank to form a hard phase segregation zone as carbon and phosphorus elements in steel, and pearlite zonal tissue is generated after rolling to cause the HIC performance of the steel to be reduced. Therefore, the manganese content of the invention is less than or equal to 1.25 percent.
Nb: niobium has the effect of increasing the strength and toughness of steel and is the most typical and most widely used microalloying element. Niobium carbonitrides may precipitate from austenite during heating and rolling, or at phase boundaries during transformation, or from supersaturated ferrite during final cooling to refine the grains. Nb is a noble element, so the content of Nb is controlled to be less than or equal to 0.04 percent.
Ti: titanium has strong affinity with carbon and nitrogen in the heating and solidification processes, forms very stable TiC and TiN particles which are enriched at a crystal boundary, forms insoluble second phase particles to block the migration and dislocation motion of the crystal boundary, has the function of strongly preventing the growth of the crystal particles, and has obvious effect of improving the fracture toughness of a heat affected zone during steel welding. However, the Ti content is too high, so that a large amount of inclusions with sharp corners are easily gathered in the center of the steel strip, and therefore, the Ti content is controlled to be less than or equal to 0.020%.
And (3) Alt: the deoxidizing element is added with a proper amount of aluminum to form fine and dispersed AlN particles, which is beneficial to refining crystal grains and improving the toughness of steel, and the content of Alt is controlled to be less than or equal to 0.035%.
S: is an extremely harmful element in acid-resistant pipeline steel, and sharply improves HIC and SSC sensitivity. MnS inclusions formed by S and Mn are the most easily nucleated positions of HIC, and MnS can become scattered spheroids through calcium treatment, so that the formation of HIC can be inhibited, and the crack sensitivity is obviously reduced. There are studies showing that: only when the sulfur content is below 0.002% HIC and SSC sensitivity is significantly reduced, even negligible. Therefore, the content of S is controlled to be less than or equal to 0.0020 percent.
P: is an inevitable impurity element in steel, is an easily segregated element, causes nonuniformity of components and tissues, and increases crack sensitivity. Therefore, the content of P is controlled to be less than or equal to 0.015 percent.
H: the solubility of H in solid steel is very low, the H is dissolved in molten steel at high temperature, and the H cannot escape in time during cooling and is gathered in a structure to form high-pressure fine pores, so that the cracking of HIC and SSC of steel products is aggravated, and the content of H is controlled to be below 0.0002% through vacuum degassing.
O: the O exists in the steel mainly in the form of inclusions, and the excessive oxygen can form complex oxide type inclusions with Ca and Al in a massive or linear distribution mode, so that the phenomenon that the HIC and SSC sensitivity is reduced due to a crack source caused by tip stress concentration is avoided.
N: is an inevitable impurity element in steel. In the invention, the content of N is controlled to be less than or equal to 0.0040 percent.
The invention aims to provide L360MS pipeline steel for a spiral welded pipe with excellent HIC and SSC resistance and a manufacturing method of a hot rolled steel strip thereof, namely a method for economically producing an L360MS pipeline steel hot rolled coil by adopting a pure steel smelting continuous casting and thermo-mechanical controlled rolling process. The production process flow comprises the following steps: KR desulfurization, converter, LF furnace, RH, slab continuous casting, reheating furnace, rough rolling high-pressure water descaling, fixed width press, E1R1 rough rolling machine, E2R2 rough rolling machine, heat preservation cover, flying shear, finish rolling high-pressure water descaling, F1-F7 finishing rolling machine, dense laminar cooling, coiling, tray transportation system, sampling and inspection.
Compared with the prior art, the invention has the beneficial technical effects that:
the L360MS hot-rolled coil product has excellent performance and small fluctuation. The yield strength Rt0.5 of the coiled sheet is 460-500 MPa, the tensile strength Rm is 530-560 MPa, the elongation A50 is more than or equal to 35%, the Charpy impact power Akv at the temperature of minus 20 ℃ is more than or equal to 250J, and the HIC resistance and the SSC resistance are tested according to the international NACE standard and completely meet the requirements.
The technical scheme of the invention is simple and reasonable in design, mainly uses low-carbon medium-manganese steel, only adds trace Nb and Ti alloy elements, and is beneficial to cost reduction and efficiency improvement of enterprises. The product has good low-temperature fracture toughness, can be applied to extremely cold regions, has the double characteristics of hydrogen induced cracking resistance and stress corrosion cracking resistance, and completely meets the requirements of national standards and international standards.
The L360MS hot-rolled coil plate has excellent product performance and economic and reasonable component design, is rolled into a coil plate by combining reasonable pure steel smelting continuous casting and thermo-mechanical control rolling processes, has excellent quality, can be widely applied to the construction of oil and gas transmission pipelines, meets the requirements of APISPEC5L standards for various indexes of the product, and has outstanding economic benefit and good social benefit.
Drawings
The invention is further illustrated in the following description with reference to the drawings.
FIG. 1 shows a metallographic structure of a steel strip according to an embodiment of the invention; the figure shows polygonal ferrite and a small amount of pearlite, the crystal grains are fine and uniform, a banded structure does not exist, the size of the crystal grains is about 12 grades, and the crystal grains are 0.5-1 grade higher than that of the common L360M.
Detailed Description
The following examples are intended to illustrate the invention in detail, and are intended to be a general description of the invention, and not to limit the invention.
Examples
The weight percentage of the used components of the experimental steels with 3 numbers in actual smelting is shown in Table 1, Table 2 is the specific process system of the example steels, Table 3 is the mechanical properties of the example steels, Table 4 is the HIC resistance of the example steels, and Table 5 is the SSC resistance of the example steels.
Table 1 examples steel chemical composition (wt%)
Table 2 examples steel process schedule
TABLE 3 mechanical Properties of the steels of the examples
TABLE 4 HIC resistance of the steels of the examples
Note: no hydrogen bubbles were present on the surface of the samples.
TABLE 5 SSC resistance of the steels of the examples
As can be seen from the examples, the steel of the examples of the invention has the advantages of excellent performance, small fluctuation and yield strength Rt0.5460 to 500MPa, tensile strength Rm 530 to 560MPa, elongation A50 not less than 35%,the Charpy impact power Akv at the temperature of minus 20 ℃ is more than or equal to 250J, and the HIC resistance and the SSC resistance are tested according to the international NACE standard and completely meet the requirements. The steel of the invention has excellent HIC and SSC resistance and low-temperature fracture toughness.
The above-described embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solutions of the present invention can be made by those skilled in the art without departing from the spirit of the present invention, and the technical solutions of the present invention are within the scope of the present invention defined by the claims.
Claims (7)
1. A chromium-free molybdenum hot-rolled steel strip for resisting H2S corrosion for a L360MS spiral welded pipe is characterized by comprising the following components in percentage by weight:
the composition comprises the following components in percentage by mass: less than or equal to 0.06 percent of C, less than or equal to 0.20 percent of Si, less than or equal to 1.25 percent of Mn, less than or equal to 0.040 percent of Nb, less than or equal to 0.020 percent of Ti, less than or equal to 0.035 percent of Alt, less than or equal to 0.015 percent of P, less than or equal to 0.0020 percent of S, less than or equal to 0.0002 percent of H, less than or equal to 0.0030 percent of O, less than or equal to 0.
2. The hot rolled steel strip for chromium-free molybdenum H2S corrosion-resistant L360MS spiral welded pipe as claimed in claim 1, wherein: the composition comprises the following components in percentage by mass: 0.05% of C, 0.16% of Si, 1.22% of Mn1, 0.038% of Nb0.014% of Ti0.014%, Alt0.026%, 0.012% of P, 0.002% of S, less than or equal to 0.0.0002% of H, less than or equal to 0.0020% of O, 0.0040% of N, and the balance of Fe and inevitable impurities.
3. The hot rolled steel strip for chromium-free molybdenum H2S corrosion-resistant L360MS spiral welded pipe as claimed in claim 1, wherein: the composition comprises the following components in percentage by mass: 0.05 percent of C, 0.15 percent of Si, 1.20 percent of Mn1, 0.034 percent of Nb0.015 percent of Ti0.015 percent of Alt0.026 percent of P, 0.012 percent of S, less than or equal to 0.0.0002 percent of H, less than or equal to 0.0020 percent of O, 0.0040 percent of N, and the balance of Fe and inevitable impurities.
4. The hot rolled steel strip for chromium-free molybdenum H2S corrosion-resistant L360MS spiral welded pipe as claimed in claim 1, wherein: the hot rolled steel strip comprises the following components in percentage by mass: 0.05% of C, 0.16% of Si, 1.24% of Mn1, 0.036% of Nb0.036% of Ti0.014%, Alt0.027%, 0.011% of P, 0.002% of S, less than or equal to 0.0.0002% of H, less than or equal to 0.0020% of O, 0.0040% of N, and the balance of Fe and inevitable impurities.
5. The method for manufacturing a hot rolled steel strip for a chromium-free molybdenum H2S corrosion-resistant L360MS spiral welded pipe according to any one of claims 1 to 4, wherein the method comprises the following steps:
the smelting continuous casting process comprises the following steps: KR desulfurization treatment is carried out on the smelted molten iron, the sulfur content of the smelted molten iron fed into a converter is required to be less than or equal to 0.002 percent, and the cleaning area of desulfurized slag is more than 95 percent; the tapping temperature is more than or equal to 1620 ℃, and the coordination of the components and the temperature is ensured for tapping; if a new steel tapping hole or an abnormal turnover ladle is not formed, the steel tapping temperature is increased by 10-15 ℃ on the basis of the upper limit; adding aluminum iron, ferrosilicon and ferromanganese into the converter steel tapping process for deoxidation alloying; slagging and desulfurizing in an LF furnace, and adding aluminum iron, ferrosilicon, ferromanganese and ferroniobium to adjust to a target component range; the vacuum degree requirement of the RH procedure is less than or equal to 2.6mbar, the vacuum maintaining time is more than or equal to 15min, and the circulating pure degassing time is ensured to be more than or equal to 7 min; measuring temperature and sampling during RH vacuum treatment, and adding ferrotitanium alloy according to the components of molten steel to adjust to target components; calcium treatment is carried out after RH vacuum treatment is finished, soft blowing time is ensured to be more than 8min after wire feeding, and molten steel is prevented from being exposed;
the slab reheating and rolling process comprises the following steps: the thickness of the continuous casting billet is 230mm, the continuous casting billet is heated to be less than or equal to 1200 ℃ by a stepping heating furnace and discharged, then the continuous casting billet is subjected to two-stage controlled rolling by a rough rolling unit and a finishing rolling unit, the intermediate billet is less than or equal to 50mm, the finish rolling temperature is less than or equal to 1050 ℃, the finish rolling temperature is less than or equal to 865 ℃, and then a front dispersion laminar cooling mode is adopted for coiling at the temperature of less than or equal to 600 ℃.
6. The manufacturing method according to claim 5, characterized in that: the initial rolling temperature of finish rolling is less than or equal to 1020 ℃.
7. The manufacturing method according to claim 5, characterized in that: coiling is carried out at the temperature of less than or equal to 560 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011126200.3A CN112522602A (en) | 2020-10-20 | 2020-10-20 | Chromium-free molybdenum hot-rolled steel strip for H2S corrosion resistant L360MS spiral welded pipe and manufacturing method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011126200.3A CN112522602A (en) | 2020-10-20 | 2020-10-20 | Chromium-free molybdenum hot-rolled steel strip for H2S corrosion resistant L360MS spiral welded pipe and manufacturing method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112522602A true CN112522602A (en) | 2021-03-19 |
Family
ID=74979853
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011126200.3A Pending CN112522602A (en) | 2020-10-20 | 2020-10-20 | Chromium-free molybdenum hot-rolled steel strip for H2S corrosion resistant L360MS spiral welded pipe and manufacturing method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112522602A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113832399A (en) * | 2021-09-23 | 2021-12-24 | 马鞍山钢铁股份有限公司 | Economical hydrogen sulfide corrosion resistant pipeline steel and production method thereof |
| CN114737110A (en) * | 2022-02-28 | 2022-07-12 | 鞍钢股份有限公司 | Steel for X52 straight welded pipe for HIC-resistant oil and gas pipeline and manufacturing method thereof |
| CN114959468A (en) * | 2022-05-18 | 2022-08-30 | 包头钢铁（集团）有限责任公司 | Thick-specification extremely cold-resistant nickel-free L360MSX52MS H-resistant material 2 S-corrosion hot-rolled coil and preparation method thereof |
| CN115627415A (en) * | 2022-09-28 | 2023-01-20 | 山东钢铁集团日照有限公司 | Low-cost thick-specification high-strength hot-rolled strip steel for pipe piles and preparation method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005290546A (en) * | 2004-03-09 | 2005-10-20 | Jfe Steel Kk | Hot rolled steel sheet for low yr type electric resistance welded steel tube having excellent aging resistance and method for manufacturing the same |
| CN109355563A (en) * | 2018-11-12 | 2019-02-19 | 包头钢铁（集团）有限责任公司 | The effective hot rolled strip of one kind 750MPa grades of truck drive shafts of 3 ~ 8mm tensile strength and its production method |
| CN109536847A (en) * | 2017-09-21 | 2019-03-29 | 上海梅山钢铁股份有限公司 | 390MPa grades of welded tube hot rolled steel plates of yield strength and its manufacturing method |
-
2020
- 2020-10-20 CN CN202011126200.3A patent/CN112522602A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005290546A (en) * | 2004-03-09 | 2005-10-20 | Jfe Steel Kk | Hot rolled steel sheet for low yr type electric resistance welded steel tube having excellent aging resistance and method for manufacturing the same |
| CN109536847A (en) * | 2017-09-21 | 2019-03-29 | 上海梅山钢铁股份有限公司 | 390MPa grades of welded tube hot rolled steel plates of yield strength and its manufacturing method |
| CN109355563A (en) * | 2018-11-12 | 2019-02-19 | 包头钢铁（集团）有限责任公司 | The effective hot rolled strip of one kind 750MPa grades of truck drive shafts of 3 ~ 8mm tensile strength and its production method |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113832399A (en) * | 2021-09-23 | 2021-12-24 | 马鞍山钢铁股份有限公司 | Economical hydrogen sulfide corrosion resistant pipeline steel and production method thereof |
| CN114737110A (en) * | 2022-02-28 | 2022-07-12 | 鞍钢股份有限公司 | Steel for X52 straight welded pipe for HIC-resistant oil and gas pipeline and manufacturing method thereof |
| CN114737110B (en) * | 2022-02-28 | 2023-03-03 | 鞍钢股份有限公司 | Steel for X52 straight welded pipe for HIC-resistant oil and gas pipeline and manufacturing method thereof |
| CN114959468A (en) * | 2022-05-18 | 2022-08-30 | 包头钢铁（集团）有限责任公司 | Thick-specification extremely cold-resistant nickel-free L360MSX52MS H-resistant material 2 S-corrosion hot-rolled coil and preparation method thereof |
| CN115627415A (en) * | 2022-09-28 | 2023-01-20 | 山东钢铁集团日照有限公司 | Low-cost thick-specification high-strength hot-rolled strip steel for pipe piles and preparation method thereof |
| CN115627415B (en) * | 2022-09-28 | 2024-04-16 | 山东钢铁集团日照有限公司 | Hot-rolled strip steel for low-cost thick-specification high-strength tubular pile and preparation method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| AU2003264947B2 (en) | High strength seamless steel pipe excellent in hydrogen-induced cracking resistance and its production method | |
| CN109457179B (en) | Hot-rolled steel strip for hydrogen sulfide corrosion resistant welded pipe and manufacturing method thereof | |
| CN109957712B (en) | Low-hardness X70M pipeline steel hot-rolled plate coil and manufacturing method thereof | |
| CN112522602A (en) | Chromium-free molybdenum hot-rolled steel strip for H2S corrosion resistant L360MS spiral welded pipe and manufacturing method thereof | |
| KR101331976B1 (en) | Method of manufacturing sheet steel for thick-walled sour-resistant line pipe of excellent toughness | |
| US11313007B2 (en) | High-strength seamless steel pipe for oil country tubular goods, and method for producing the same | |
| CN112226676B (en) | Low-cost L320MS/X46MS hot-rolled steel strip for hydrogen sulfide corrosion resistant welded pipe and manufacturing method thereof | |
| CN106811700B (en) | A kind of think gauge acid-resisting X60MS hot-rolled coils and its manufacture method | |
| CN109402510A (en) | A kind of resistance to anti-H that extremely trembles with fear2S corrodes welded tube hot rolled strip and its manufacturing method | |
| CN104789866A (en) | High-strength and high-toughness steel plate for 630MPa-grade tempered low-temperature spherical tank and manufacture method thereof | |
| CN114959468B (en) | Nickel-free L360MSX52MS H-resistant thick-specification extreme cold-resistant 2 S-corrosion hot-rolled coil and preparation method thereof | |
| CN111378893A (en) | Hot-rolled steel plate for longitudinal welded pipe with yield strength of 290MPa | |
| CN109402511B (en) | Hot-rolled steel strip for hydrogen sulfide corrosion resistant welded pipe and manufacturing method thereof | |
| CN113564460A (en) | Low-cost MnNb series acid-resistant pipeline steel hot-rolled plate coil without Cu, Cr, Ni, Mo and V and manufacturing method thereof | |
| CN111893401A (en) | L450MS pipeline steel with excellent SSCC resistance under high loading stress and manufacturing method thereof | |
| CN111607747A (en) | Hydrogen sulfide corrosion resistant X70 grade pipeline steel for seabed and production method thereof | |
| JP3879723B2 (en) | High-strength seamless steel pipe excellent in hydrogen-induced crack resistance and method for producing the same | |
| JP2000178697A (en) | Martensitic stainless steel excellent in corrosion resistance and weldability | |
| CN107974613B (en) | Production method of sulfide stress corrosion cracking resistant X80 grade pipeline steel | |
| JP3854412B2 (en) | Sour-resistant steel plate with excellent weld heat-affected zone toughness and its manufacturing method | |
| CN115369323B (en) | 800 MPa-level hydrogen-induced crack resistant container steel plate and production method thereof | |
| CN109047694B (en) | Economic HIC-resistant pipeline steel plate X65MS for TMCP delivery and manufacturing method thereof | |
| CN111705262B (en) | Magnesium-containing X65 pipeline steel with excellent acid resistance and production method thereof | |
| JPH11302776A (en) | High strength steel sheet excellent in sour resistance and its production | |
| CN116790978A (en) | Acid corrosion resistant pipeline steel plate and preparation 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 |