CN116408349A - Industrial manufacturing method of hot rolled plate coil for low-cost 360 MPa-grade yield strength hydrogen-doped gas pipeline - Google Patents

Industrial manufacturing method of hot rolled plate coil for low-cost 360 MPa-grade yield strength hydrogen-doped gas pipeline Download PDF

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CN116408349A
CN116408349A CN202310277873.6A CN202310277873A CN116408349A CN 116408349 A CN116408349 A CN 116408349A CN 202310277873 A CN202310277873 A CN 202310277873A CN 116408349 A CN116408349 A CN 116408349A
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曹妍
刘妍
宿成
张嘉华
高燕飞
张文录
张琢晶
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Baotou Iron and Steel Group Co Ltd
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    • 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
    • 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
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/001—Continuous casting of metals, i.e. casting in indefinite lengths of specific alloys
    • 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
    • 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
    • C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
    • 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
    • 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
    • C22C38/02—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
    • 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
    • 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
    • C21D2211/005—Ferrite
    • 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
    • C21D2211/009—Pearlite
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling

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  • Metallurgy (AREA)
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  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Heat Treatment Of Steel (AREA)

Abstract

The invention discloses a low-cost industrial manufacturing method of hot rolled coils for hydrogen-doped gas pipelines with yield strength of 360MPa, which comprises the following steps: KR molten iron desulfurization pretreatment, converter top-bottom converting, LF refining, RH refining, slab continuous casting, reheating, roughing and finishing mill group controlled rolling, cooling, coiling, tray conveying system, sampling and inspection, wherein the roughing and finishing mill group controlled rolling process comprises roughing high-pressure water descaling, fixed width press, E1R1 roughing mill, E2R2 roughing mill, heat preservation cover, flying shear, finish rolling high-pressure water descaling and F1-F7 finishing mill; the cooling adopts encryption type laminar cooling. The hot rolled plate coil manufactured by the method has excellent comprehensive mechanical properties and has hydrogen induced cracking resistance and hydrogen embrittlement resistance.

Description

Industrial manufacturing method of hot rolled plate coil for low-cost 360 MPa-grade yield strength hydrogen-doped gas pipeline
Technical Field
The invention relates to the technical application field of new energy steel products, in particular to a hot rolled coil industrial manufacturing method for a low-cost 360 MPa-grade yield strength hydrogen-doped gas pipeline, and specifically relates to a hot rolled coil industrial manufacturing method with Hydrogen Induced Cracking (HIC) resistance and hydrogen embrittlement resistance. Crack Tip Opening Displacement (CTOD) meets the use requirement, a hydrogen environment slow strain rate tensile test meets the GB/T34542.2 requirement, and the Crack Tip Opening Displacement (CTOD) has no strength and plasticity deterioration indication, and completely meets the technical specification of the hydrogen-doped pipeline material with the yield strength of 360 MPa.
Background
Hydrogen energy is an important direction of energy conversion and upgrading and is also an important way for achieving the aim of carbon neutralization. At present, more and more new or in-service natural gas pipeline network project projects are sequentially used for realizing hydrogen loading and conveying, and the projects relate to various steel products, large pipe diameter and pressure ranges and wide application. The hot rolled coil with the low-cost yield strength of 360MPa for the hydrogen-doped gas pipeline is used for the construction of gas pipeline engineering in the western natural gas (baotou-temporary river) section, the pipeline conveying medium contains 10% of hydrogen, the whole pipeline length is 270 km, and the hot rolled coil is an exemplary engineering project for advocating clean energy conveying in recent years in China.
1. The patent CN114645215A (L245S hydrogen-doped pipeline steel and production method thereof) is a production method of L245S grade heat treatment production process hydrogen-doped pipeline steel, the strength grade of the patent is higher than that of the patent I and is steel for thermo-mechanical rolling, the patent I does not contain heat treatment working procedures, the variety type and production process are different from the patent I, and the process flow is short. The patent not only adopts Nb+Ti microalloying to realize economic component design, but also is more beneficial to inclusion and H, O content control by LF+RH double refining smelting technology, improves the purity of steel, and ensures the hydrogen embrittlement resistance of the product.
2. Document two CN113862549A, namely a production method of L360QS hydrogen transmission pipeline steel, is a production method of L360QS grade heat treatment production process hydrogen transmission pipeline steel, and the patent is L360MS grade steel for thermo-mechanical rolling, does not contain heat treatment working procedures, is different from document two in variety type and production process, and has short process flow. The patent only adopts the design of Nb+Ti microalloying components, does not add noble metal elements such as Cr, mo and the like, and has low cost.
3. Document three CN 115584441A' hot rolled plate for hydrogen transmission pipeline with 245MPa grade yield strength
The coil and the production method thereof are the production method of the hot rolled coil for the 245 MPa-level hydrogen transmission pipeline, the strength level of the hot rolled coil is higher than that of the third document, and the yield strength is 360 MPa. The method is specially used for manufacturing the hot rolled plate coil for the hydrogen-doped gas pipeline, has the control technology of ultralow phosphorus P less than or equal to 0.010 percent and low sulfur S less than or equal to 0.0015 percent, relates to the hydrogen-induced cracking (HIC) resistance of products, has the hydrogen embrittlement resistance, meets the requirements of users through crack tip opening displacement CTOD detection, does not have strength and plastic deterioration indication through slow strain rate tensile detection in the hydrogen environment, and completely meets the technical specification of the hydrogen-doped pipeline material with the yield strength of 360 MPa.
Disclosure of Invention
The invention aims to provide a hot rolled coil industrial manufacturing method for a low-cost hydrogen-doped gas pipeline with yield strength of 360MPa, which is characterized in that low-carbon C-Mn steel is mainly used as a component design, a trace amount of Nb, ti and the like are added for alloying, and an ultralow sulfur phosphorus smelting control technology and a TMCP controlled rolling and cooling process are combined to obtain the hydrogen-doped pipeline steel with excellent toughness, hydrogen-induced cracking resistance and hydrogen environment slow strain rate tensile property. The performance of the produced hot rolled coil meets the following conditions: the yield strength is 390 MPa-490 MPa, the tensile strength is 480 MPa-560 MPa, the elongation is more than or equal to 30%, the yield ratio is less than or equal to 0.93, the Charpy impact energy Akv at-20 ℃ is more than or equal to 300J, the grain size is more than or equal to 11 levels, the Hydrogen Induced Cracking (HIC) resistant Crack Sensitivity (CSR) is less than or equal to 2%, the Crack Length (CLR) is less than or equal to 15%, the Crack Thickness (CTR) is less than or equal to 5%, the Crack Tip Opening Displacement (CTOD) at the test temperature of-10 ℃ is less than or equal to 0.254mm, the hydrogen environment slow strain rate tensile test meets the GB/T34542.2 requirement, and the strength and plastic deterioration indication are not existed, and the user requirement is met.
In order to solve the technical problems, the invention adopts the following technical scheme:
the invention relates to a low-cost industrial manufacturing method of hot rolled coils for 360 MPa-grade yield strength hydrogen-doped gas pipelines, which comprises the following steps: KR molten iron desulfurization pretreatment, converter top-bottom converting, LF refining, RH refining, slab continuous casting, reheating, roughing and finishing mill group controlled rolling, cooling, coiling, tray conveying system, sampling and inspection, wherein the roughing and finishing mill group controlled rolling process comprises roughing high-pressure water descaling, fixed width press, E1R1 roughing mill, E2R2 roughing mill, heat preservation cover, flying shear, finish rolling high-pressure water descaling and F1-F7 finishing mill; the cooling adopts encryption type laminar flow cooling, and is characterized in that:
p is less than or equal to 0.010 percent in a continuous casting blank formed after the continuous casting treatment of the plate blank; s is less than or equal to 0.0015%; less than or equal to 0.0050 percent of [ N ], [ O ] < 0.0030 percent, and less than or equal to 0.0002 percent of [ H ]; the vacuum degree of RH refining process is less than or equal to 2.6mbar, and the vacuum time is more than or equal to 15min. Ensuring that the circulating pure degassing time is more than or equal to 7min during RH vacuum treatment; after RH vacuum treatment is finished, feeding a calcium wire to perform calcium treatment, wherein the soft blowing time after wire feeding is more than 8min; adopting continuous casting blank soft reduction technology to control center segregation;
adopting 2250mm hot continuous rolling, heating the continuous casting billet with the thickness of 230mm by a step heating furnace to be less than or equal to 1200 ℃, discharging, then carrying out two-stage controlled rolling by a rough rolling mill group of less than or equal to 8 times and a finishing rolling mill group of 7 times, wherein the finishing rolling temperature of the finishing rolling is less than or equal to 860 ℃, then adopting an encryption laminar cooling mode to rapidly and uniformly cool, and coiling at the temperature of less than or equal to 600 ℃.
Further, the hot rolled coil comprises the following components in percentage by mass: less than or equal to 0.07 percent of C, less than or equal to 0.40 percent of Si, less than or equal to 1.25 percent of Mn, less than or equal to 0.010 percent of P, less than or equal to 0.0015 percent of S, less than or equal to 0.060 percent of Nb, less than or equal to 0.040 percent of Ti, less than or equal to 0.060 percent of Al, and the balance of Fe and unavoidable impurities.
Further, the mechanical properties of the hot rolled coil satisfy: the yield strength is 390 MPa-490 MPa, the tensile strength is 480 MPa-560 MPa, the elongation is more than or equal to 30%, the yield ratio is less than or equal to 0.93, the Charpy impact energy Akv at-20 ℃ is more than or equal to 300J, the grain size is more than or equal to 11 levels, the Hydrogen Induced Cracking (HIC) resistant Crack Sensitivity (CSR) is less than or equal to 2%, the Crack Length (CLR) is less than or equal to 15%, and the Crack Thickness (CTR) is less than or equal to 5%; crack Tip Opening Displacement (CTOD) of less than or equal to 0.254mm at the test temperature of-10 ℃; the hydrogen environment slow strain rate tensile test meets the GB/T34542.2 requirements and has no strength and plasticity deterioration indication, thereby meeting the user requirements.
The main elements are selected as follows:
c: the C content in the steel increases, the yield strength and tensile strength increase, but the toughness decreases. For pipeline steel, if the carbon content is too high, the toughness of the steel is reduced sharply, the weldability is deteriorated, meanwhile, C is an easily segregated element which can aggravate center segregation of a casting blank, pearlite band-shaped structures are easily formed after rolling, and the hydrogen-induced crack resistance of the steel is seriously affected, so that the design thinking of adopting low-carbon components is H resistance 2 S pipeline product design, and the strength loss of steel is compensated by the action of alloy elements. Therefore, the carbon content is controlled to be less than or equal to 0.07 percent.
Si: deoxidizing element is dissolved in ferrite to raise the strength of steel, but the Si content is controlled to less than or equal to 0.40% while the plasticity and toughness are lost.
Mn: manganese can be infinitely displaced and dissolved with iron and is a good solid-melting strengthening element, but manganese in steel is easily enriched in the center of a casting blank to form a hard phase segregation zone as carbon and phosphorus elements, and a pearlite band-shaped structure is generated after rolling to reduce the HIC (high performance) of the steel. Therefore, the manganese content of the present invention is 1.25% or less.
P: the segregation zone of the components in the steel is one of important factors influencing the sensitivity of hydrogen induced cracking, and the P element is extremely easy to generate segregation in the crystallization process in the steel, so that the components and the structure are uneven, and the sensitivity of the hydrogen induced cracking is increased. Therefore, the invention controls the P content to be less than or equal to 0.010 percent, and the control level of P is also a mandatory technical index for the application of the prior hydrogen-doped gas pipeline engineering.
S: is an element extremely harmful to the resistance to hydrogen corrosion cracking, and sharply increases the sensitivity to hydrogen induced cracking. MnS inclusions formed by S and Mn are the most likely sites for hydrogen induced cracking, and MnS is generally formed into bulk spheres by calcium treatment, so that the formation of hydrogen induced cracking can be suppressed. The invention controls the S content to be less than or equal to 0.0015 percent, and the control level of S is also a mandatory technical index for the application of the prior hydrogen-doped gas pipeline engineering.
Al: deoxidizing element and proper amount of aluminum are added to form fine dispersed AlN particles, which is favorable for refining grains and improving the toughness of steel.
Nb: niobium has the effect of improving the strength and toughness of the steel, becoming the most typical and most widely used microalloying element. Niobium carbonitrides may be precipitated from austenite during heating and rolling, or phase boundaries during transformation, or from supersaturated ferrite during final cooling to refine the grains. Nb is a noble element, and the content of the Nb is controlled to be less than or equal to 0.060 percent.
Ti: titanium has extremely strong affinity with carbon and nitrogen in the heating and solidifying process, so that very stable TiC and TiN particles are formed and enriched at the grain boundary, insoluble second phase particles are formed to block the migration of the grain boundary and dislocation movement, the effect of strongly preventing the growth of the grains is achieved, and the method has obvious effect of improving the fracture toughness of a heat affected zone during steel welding. Therefore, the Ti content is controlled to be less than or equal to 0.040 percent.
Compared with the prior art, the invention has the beneficial technical effects that:
(1) By virtue of the advantages of 2250mm rolling mill equipment, the product design cost is low, C-Mn steel is taken as the main material, and only a trace amount of Nb and Ti alloy elements are added, so that the product creation effect of enterprises is facilitated.
(2) The product has good hydrogen induced cracking resistance and hydrogen embrittlement resistance, and the Crack Tip Opening Displacement (CTOD) and the slow strain rate tensile property under the hydrogen environment meet the user requirements, so that the product is suitable for manufacturing domestic and foreign hot rolled coils with 360 MPa-level yield strength of hydrogen-doped gas pipelines.
The method has the following advantages:
the hot rolled coiled plate for the hydrogen-doped gas pipeline with the low-cost yield strength of 360MPa has excellent product performance, and the component design is economical and reasonable, particularly has the characteristics of Hydrogen Induced Cracking (HIC) resistance and hydrogen embrittlement resistance, and the Crack Tip Opening Displacement (CTOD) and the slow strain rate tensile property in a hydrogen environment completely meet the technical specifications of the hydrogen-doped pipeline with the yield strength of 360 MPa.
The invention combines the ultralow sulfur and phosphorus smelting continuous casting technology and the rolling and cooling control technology, the produced coiled sheet has excellent quality, and the welded steel pipe can be widely applied to the construction of hydrogen-doped gas transmission pipeline projects, provides important technical support for developing new energy transmission materials in China, and has outstanding economic benefit and good social benefit in the application field of new energy.
Drawings
The invention is further described with reference to the following description of the drawings.
FIG. 1 shows the metallographic structure (500 times) of a 360MPa grade hot rolled coil with yield strength obtained in example 2 of the present invention.
Detailed Description
The following examples are given to illustrate the present invention in detail, but are merely a general description of the present invention and are not intended to limit the present invention.
Examples
The following detailed description of the present invention is provided by way of example only, and it should be understood by those skilled in the art that the examples are not intended to limit the scope of the present invention.
The weight percentages of the components used in the experimental steels of examples 1 to 3 are shown in the following table 1, the specific process systems of the examples are shown in table 2, and the mechanical properties of the steels of the examples are shown in table 3. In which fig. 1 shows the metallographic structure of the steel strip obtained in example 2, the metallographic structure is ferrite + pearlite, the crystal grains are fine and uniform, no band structure is formed, and the crystal grain size is about 12 grades.
Table 1: chemical composition (wt.%)
Examples C Si Mn P S Al Nb+Ti
1 0.05 0.160 1.18 0.006 0.001 0.040 ≤0.10％
2 0.04 0.160 1.18 0.006 0.001 0.036 ≤0.10％
3 0.06 0.160 1.18 0.006 0.001 0.039 ≤0.10％
Table 2: process system of each embodiment
Figure BDA0004136959340000061
Figure BDA0004136959340000071
Table 3: mechanical properties of the steels of the examples
Figure BDA0004136959340000072
TABLE 4 HIC resistance of base materials
Figure BDA0004136959340000073
Note that: the surface of the sample has no hydrogen bubbling.
TABLE 5 Hydrogen ambient slow strain rate tensile Properties
Figure BDA0004136959340000074
Figure BDA0004136959340000081
From the embodiment, the mechanical property of the steel meets the standard requirement, no hydrogen induced crack exists, the hydrogen environment slow strain rate tensile test meets the GB/T34542.2 requirement, no strength and plasticity deterioration indication exists, and the Crack Tip Opening Displacement (CTOD) meets the user requirement.
The above embodiments are only illustrative of the preferred embodiments of the present invention and are not intended to limit the scope of the present invention, and various modifications and improvements made by those skilled in the art to the technical solutions of the present invention should fall within the protection scope defined by the claims of the present invention without departing from the design spirit of the present invention.

Claims (3)

1. A low-cost 360MPa grade yield strength hot rolled coil industrial manufacturing method for hydrogen-doped gas pipelines comprises the following steps: KR molten iron desulfurization pretreatment, converter top-bottom converting, LF refining, RH refining, slab continuous casting, reheating, roughing and finishing mill group controlled rolling, cooling, coiling, tray conveying system, sampling and inspection, wherein the roughing and finishing mill group controlled rolling process comprises roughing high-pressure water descaling, fixed width press, E1R1 roughing mill, E2R2 roughing mill, heat preservation cover, flying shear, finish rolling high-pressure water descaling and F1-F7 finishing mill; the cooling adopts encryption type laminar flow cooling, and is characterized in that:
p is less than or equal to 0.010 percent in a continuous casting blank formed after the continuous casting treatment of the plate blank; s is less than or equal to 0.0015%; less than or equal to 0.0050 percent of [ N ], [ O ] < 0.0030 percent, and less than or equal to 0.0002 percent of [ H ]; the vacuum degree of RH refining process is less than or equal to 2.6mbar, and the vacuum time is more than or equal to 15min. Ensuring that the circulating pure degassing time is more than or equal to 7min during RH vacuum treatment; after RH vacuum treatment is finished, feeding a calcium wire to perform calcium treatment, wherein the soft blowing time after wire feeding is more than 8min; adopting continuous casting blank soft reduction technology to control center segregation;
adopting 2250mm hot continuous rolling, heating the continuous casting billet with the thickness of 230mm by a step heating furnace to be less than or equal to 1200 ℃, discharging, then carrying out two-stage controlled rolling by a rough rolling mill group of less than or equal to 8 times and a finishing rolling mill group of 7 times, wherein the finishing rolling temperature of the finishing rolling is less than or equal to 860 ℃, then adopting an encryption laminar cooling mode to rapidly and uniformly cool, and coiling at the temperature of less than or equal to 600 ℃.
2. The industrial manufacturing method of the hot rolled coil for the low-cost yield strength 360 MPa-grade hydrogen-doped gas pipeline according to claim 1, wherein the method comprises the following steps of: the hot rolled coil comprises the following components in percentage by mass: less than or equal to 0.07 percent of C, less than or equal to 0.40 percent of Si, less than or equal to 1.25 percent of Mn, less than or equal to 0.010 percent of P, less than or equal to 0.0015 percent of S, less than or equal to 0.060 percent of Nb, less than or equal to 0.040 percent of Ti, less than or equal to 0.060 percent of Al, and the balance of Fe and unavoidable impurities.
3. The industrial manufacturing method of the hot rolled coil for the low-cost yield strength 360 MPa-grade hydrogen-doped gas pipeline according to claim 2, wherein the manufacturing method comprises the following steps of: the mechanical properties of the hot rolled coil meet the following conditions: the yield strength is 390 MPa-490 MPa, the tensile strength is 480 MPa-560 MPa, the elongation is more than or equal to 30%, the yield ratio is less than or equal to 0.93, the Charpy impact energy Akv at-20 ℃ is more than or equal to 300J, the grain size is more than or equal to 11 levels, the Hydrogen Induced Cracking (HIC) resistant Crack Sensitivity (CSR) is less than or equal to 2%, the Crack Length (CLR) is less than or equal to 15%, and the Crack Thickness (CTR) is less than or equal to 5%; crack Tip Opening Displacement (CTOD) of less than or equal to 0.254mm at the test temperature of-10 ℃; the hydrogen environment slow strain rate tensile test meets the GB/T34542.2 requirements and has no strength and plasticity deterioration indication, thereby meeting the user requirements.
CN202310277873.6A 2023-03-21 2023-03-21 Industrial manufacturing method of hot rolled plate coil for low-cost 360 MPa-grade yield strength hydrogen-doped gas pipeline Pending CN116408349A (en)

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