CN115418575A - High-precision low-yield-ratio steel belt for HP295 welded gas cylinder and production method thereof - Google Patents
High-precision low-yield-ratio steel belt for HP295 welded gas cylinder and production method thereof Download PDFInfo
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- CN115418575A CN115418575A CN202211294360.8A CN202211294360A CN115418575A CN 115418575 A CN115418575 A CN 115418575A CN 202211294360 A CN202211294360 A CN 202211294360A CN 115418575 A CN115418575 A CN 115418575A
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- 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
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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
- B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
- B21B1/24—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process
- B21B1/26—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process by hot-rolling, e.g. Steckel hot mill
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- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/04—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing
- B21B45/08—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing hydraulically
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- 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
- B22D11/16—Controlling or regulating processes or operations
- B22D11/20—Controlling or regulating processes or operations for removing cast stock
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- 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
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- 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
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- 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
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- 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
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- 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
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- 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
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- 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
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- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
The invention relates to a high-precision low-yield ratio steel belt for an HP295 welding gas cylinder and a production method thereof, wherein the steel belt for the HP295 welding gas cylinder comprises the following chemical components in percentage by weight: c: 0.12-0.15%, si 0.06-0.20%, mn 0.75-0.9%, als:0.015% -0.045%, N is less than or equal to 0.0045%, the balance is Fe and inevitable impurities, the elongation is controlled to be more than or equal to 28%, the yield ratio is less than or equal to 0.8, the 180-degree cold bending performance is qualified by 100%, and the steel plate is manufactured by reasonably designing the contents of C, si, mn, P and S elements, wherein C: 0.12-0.15%, si 0.06-0.20%, mn 0.75-0.9%, als:0.015% -0.045%, N is less than or equal to 0.0045%, adopt and regard carbon, manganese as the main element, fully exert carbon, manganese element and strengthen the effect, lowering production cost; the rolling and cooling control process is reasonably set, stable production is realized under the capability of the existing equipment, the strength, the elongation and other properties of the steel are ensured to meet the requirements, the thickness deviation is-0.1 to +0mm, and the appearance size meets the requirements of users, so that the steel belt HP295 for welding the gas cylinder has good machining performance and meets the expectations of the users.
Description
Technical Field
The invention belongs to the field of metallurgy, and relates to a high-precision low-yield-ratio steel belt for an HP295 welded gas cylinder and a production method thereof.
Background
GB6653 steel plate and steel band are commonly called as steel for welding cylinder or steel for welding cylinder. Mainly hot rolled steel sheets and strips having a thickness of 2 to 14mm, and cold rolled steel sheets and strips having a thickness of 1.5 to 4 mm. The GB6653 steel plate and steel belt for welding the gas cylinder have certain strength, good stamping performance, good welding performance, low cold-brittleness transition temperature and other comprehensive mechanical properties. The main grades of GB6653 steel for welding gas cylinders are: HP235, HP265, HP295, HP325, HP345.HP295 is as the welding cylinder steel product of medium strength grade, and material strength is higher than HP265, comprehensive strength and thickness, satisfies welding cylinder steel user lightweight demand basically simultaneously, has lower production and use cost, the sexual valence relative altitude. The finished gas cylinder is sold in southeast Asia and middle Asia areas because of excellent forming and processing performance of the product, and has wide market prospect.
Patent application No. 202111068524 relates to a welded bottle steel hot rolled plate strip HP295 and a manufacturing method thereof. The steel comprises the following components in percentage by weight: c:0.13-0.16%, si: less than or equal to 0.07 percent, mn:0.7 to 1.0 percent of the total weight of the alloy, less than or equal to 0.020 percent of P, less than or equal to 0.01 percent of S, more than or equal to 0.020 percent of Alt and less than or equal to 0.050 percent of S, 0.010 to 0.020 percent of Ti, less than or equal to 0.005 percent of N, and the balance of Fe and inevitable impurities. The invention adopts a chemical component system with lower cost to produce the low-yield-ratio and light-weight rolled plate for the titanium-containing alloy hot-rolled welding bottle with the specification of 3mm, and the performance of the rolled plate can meet or even be strictly in accordance with the standard requirement; the product can be used for replacing the thickness with the thinness, has large vehicle weight reduction range and has higher social benefit and environmental benefit. However, the invention does not consider the thickness precision requirement range of-0.1 to +0mm of the series of products in the industry, has more performance influence factors, has higher difficulty in improving the yield ratio and the forming performance of the products by simply designing components, has requirements on production conditions and has no universal applicability; in addition, the invention adds titanium which is a micro-alloy element with larger movement, the manufacturing cost is increased, and the performance stability has certain fluctuation.
Disclosure of Invention
In view of the above, the invention provides a high-precision low-yield ratio steel strip for an HP295 welded gas cylinder and a production method thereof, aiming at solving the problems that the existing hot rolled steel strip for the welded gas cylinder HP295 is high in manufacturing cost, unstable in performance, poor in thickness precision and incapable of widely meeting the use requirements of customers.
In order to achieve the purpose, the invention provides the following technical scheme:
a high-precision low-yield-ratio steel belt for an HP295 welding gas cylinder comprises the following chemical components in percentage by weight: c: 0.12-0.16%, si 0.06-0.20%, mn 0.75-0.9%, als: 0.015-0.045%, N is less than or equal to 0.0045%, and the balance is Fe and inevitable impurities;
the steel belt for the HP295 welding gas cylinder is controlled to have an elongation rate of more than or equal to 28 percent, a yield ratio of less than or equal to 0.8 and a 180-degree cold bending performance of 100 percent.
A high-precision low-yield-ratio steel strip for an HP295 welding gas cylinder is designed by adopting the components of the steel strip for the HP295 welding gas cylinder, and the manufacturing method adopts the following processes: blast furnace molten iron → molten iron pretreatment → converter smelting → external LF furnace refining → slab continuous casting → slab heating → high pressure descaling → rough rolling with vertical roller → finish rolling high pressure descaling → finish rolling 7 rack continuous rolling → U-shaped pipe laminar cooling → coiling by coiling machine, packing → steel coil information surface spraying, side spraying → surface size and quality inspection → batch sampling and inspection → labeling after inspection and storage and delivery.
Further, in the slab continuous casting process: the casting blank drawing speed is controlled to be 1.0-1.2m/s.
Further, in the slab heating step: the heating temperature and the heating furnace time are respectively controlled to be 1240-1270 ℃ and 170-190 min.
Further, in the high-pressure descaling and finish rolling high-pressure descaling process: one group of rough descaling boxes with the pressure of 20-22 MPa, one pass of rough mill descaling, and two groups of finish rolling descaling boxes with the pressure of 19-21 MPa.
Further, in the 7-stand continuous rolling process of the finish rolling: the inlet temperature of finish rolling is more than or equal to 1050 ℃, the finish rolling temperature is 850-880 ℃, and the thickness of the intermediate billet is designed to be 33-35mm; the rolling load is as follows: f1 42%, F2 36%, F3 29%, F4 23%, F5%, F6%, F7%; the tension of the loop is respectively 4.90N per square meter, 5.39N per square meter, 5.88N per square meter, 6.86N per square meter, 8.82N per square meter and 9.80N per square meter; the rolling speeds are respectively as follows: 0.80m/s,1.38m/s,2.15m/s,3.04m/s,4.10m/s,5.00m/s,5.87m/s.
Further, in the U-shaped pipe laminar cooling process: the layer cooling mode is back-end cooling, the water cooling speed is 7-12 m/s, and the flow rate is set to be 180-220m 3 /h。
Further, in the coiling and packing process of the coiling machine: the coiling temperature is 600-650 ℃.
The invention has the beneficial effects that:
1. the invention discloses a high-precision low-yield ratio HP295 steel strip for welding gas cylinders, which is characterized in that the contents of C, si, mn, P and S elements are reasonably designed, wherein C: 0.12-0.15%, si 0.06-0.20%, mn 0.75-0.9%, als: 0.015-0.045%, N is less than or equal to 0.0045%, adopt and volatilize carbon, manganese as the main element, fully exert carbon, manganese element and strengthen the effect, lowering production cost.
2. The high-precision low-yield-ratio HP295 steel strip for welding gas cylinders disclosed by the invention is combined with the actual capacity of a production line, on the premise of ensuring stable components, the stable production is realized under the existing equipment capacity by ensuring the matching of the tapping temperature, the rolling speed and the like and reasonably setting the rolling and cooling control process, the performance of the steel, such as strength, elongation and the like, meets the requirements, the thickness deviation is-0.1- +0mm, and the appearance size meets the requirements of users, so that the steel strip HP295 for welding gas cylinders has good machining performance, meets the expectations of the users at the same time, and is really an environment-friendly material for replacing low-strength HP 235.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the means of the instrumentalities and combinations particularly pointed out hereinafter.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention.
A high-precision low-yield-ratio steel belt for an HP295 welding gas cylinder adopts a design idea of medium-carbon and medium-manganese components, and the steel belt for the HP295 welding gas cylinder comprises the following chemical components in percentage by weight: c: 0.12-0.16%, si 0.06-0.20%, mn 0.75-0.9%, als: 0.015-0.045%, N less than or equal to 0.0045%, and the balance of Fe and inevitable impurities.
Ensuring that each item of a tensile test reaches the standard, and simultaneously controlling the elongation to be more than or equal to 28% and the yield ratio to be less than or equal to 0.8 by using the steel belt for the HP295 welded gas cylinder, thereby meeting the use requirements of users.
The steel strip for the HP295 welding gas cylinder is designed by adopting the components, and the manufacturing and production method adopts the following process: blast furnace molten iron → molten iron pretreatment → converter smelting → external LF furnace refining → slab continuous casting → slab heating → high pressure descaling → rough rolling with vertical roller → finish rolling high pressure descaling → finish rolling 7 rack continuous rolling → U-shaped pipe laminar cooling → coiling by coiling machine, packing → steel coil information surface spraying, side spraying → surface size and quality inspection → batch sampling and inspection → labeling after inspection and storage and delivery.
In the slab continuous casting process: the proper casting blank pulling speed is controlled to be 1.0-1.2m/s.
In the slab heating process: the heating temperature and the heating furnace time are respectively controlled to be 1240-1270 ℃ and 170-190 min.
In the aspect of descaling, in the working procedures of high-pressure descaling and finish rolling high-pressure descaling: one group of rough descaling boxes with the pressure of 20-22 MPa, one pass of rough mill descaling, and two groups of finish rolling descaling boxes with the pressure of 19-21 MPa.
In the aspect of finish rolling, in the process of continuous rolling of a finish rolling 7 machine frame: in order to improve the stability of thickness control in the finish rolling process, the thickness of the intermediate billet is designed to be 33-35mm; the finish rolling load is: f1 42%, F2 36%, F3 29%, F4, F5%, F615%, F7%; the loop tension is respectively 4.90N per square meter, 5.39N per square meter, 5.88N per square meter, 6.86N per square meter, 8.82N per square meter and 9.80N per square meter; the rolling speeds are respectively as follows: 0.80m/s,1.38m/s,2.15m/s,3.04m/s,4.10m/s,5.00m/s,5.87m/s.
In the U-shaped pipe laminar cooling process: the layer cooling mode is back-end cooling, and the water cooling speed is 7-12 m/s; only starting the cooling water with steel between the first group of racks, and setting the flow rate of the cooling water to be 180-220m 3 /h。
Example (b):
the production method of the steel strip for the HP295 welding gas cylinder with high precision and low yield ratio adopts the following component proportion and specific process. Four batches of steel strips with thicknesses of 2.3mm, 2.65mm, 2.95mm and 3.0mm are used. Wherein, table 1 is an example (in weight percent) of the four batches of steel strip melting composition for four minutes of thickness. Table 2 shows the process parameters corresponding to the four batches of steel strip described in table 1. Table 3 shows the mechanical properties and processing properties corresponding to the compositions of the steel strips in table 1.
TABLE 1 product chemistry (wt%)
TABLE 2 Process parameters corresponding to four batches of steel strip
| Test steel coil | Thickness/mm | Heating temperature/. Degree.C | Thickness/mm of intermediate blank | Final Rolling temperature/. Degree.C | Coiling temperature/. Degree.C | Rate of cooling | Measured thickness |
| A | 2.3 | 1266 | 33.5 | 877 | 630 | 10m/s | 2.23,2.28,2.31 |
| B | 2.65 | 1257 | 33.5 | 860 | 625 | 11m/s | 2.58,2.66,2.54 |
| C | 2.95 | 1258 | 35 | 870 | 633 | 9m/s | 2.85,5.93,2.92 |
| D | 3.0 | 1251 | 35 | 861 | 621 | 8m/s | 2.92,2.99,2.98 |
TABLE 3 mechanical and technological Properties corresponding to four batches of steel strips
| Test steel coil | Thickness/mm | Re/MPa | Rm/MPa | Re/Rm | A/％ | 180 bending test |
| A | 2.3 | 355 | 481 | 0.73 | 33 | d =2.0a pass |
| B | 2.65 | 362 | 503 | 0.71 | 36 | d =2.0a pass |
| C | 2.95 | 351 | 480 | 0.74 | 30 | d =2.0a pass |
| D | 3.0 | 345 | 512 | 0.75 | 40 | d =2.0a pass |
All mechanical properties of a product produced by the steel strip production method for the HP295 welded gas cylinder all meet the requirements of national standard GB/T6693-2017, and meanwhile, the thickness tolerance meets the internal control requirement and the use of users, wherein the average value of the yield ratio is less than or equal to 0.75, the thickness deviation is-0.1- +0mm, the elongation A is more than or equal to 28%, the product has excellent plastic toughness and good comprehensive mechanical processing performance.
Finally, the above embodiments are only intended to illustrate the technical solutions of the present invention and not to limit the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the claims of the present invention.
Claims (8)
1. The high-precision low-yield ratio steel belt for the HP295 welding gas cylinder is characterized in that the steel belt for the HP295 welding gas cylinder comprises the following chemical components in percentage by weight: c: 0.12-0.16%, si 0.06-0.20%, mn 0.75-0.9%, als: 0.015-0.045%, N is less than or equal to 0.0045%, and the balance is Fe and inevitable impurities;
the steel belt for the HP295 welding gas cylinder is controlled to have an elongation rate of more than or equal to 28%, a yield ratio of less than or equal to 0.8, and a 180-degree cold bending performance of 100% and is qualified.
2. A method for producing a high-precision low-yield-ratio steel strip for an HP295 welding gas cylinder, which is characterized in that the steel strip for the HP295 welding gas cylinder as claimed in claim 1 is designed by the following components, and the manufacturing method adopts the following processes: blast furnace molten iron → molten iron pretreatment → converter smelting → external LF furnace refining → slab continuous casting → slab heating → high pressure descaling → rough rolling with vertical roller → finish rolling high pressure descaling → finish rolling 7 rack continuous rolling → U-shaped pipe laminar cooling → coiling by coiling machine, packing → steel coil information surface spraying, side spraying → surface size and quality inspection → batch sampling and inspection → labeling after inspection and storage and delivery.
3. The method for producing a high-precision low-yield-ratio steel strip for HP295 welded gas cylinders as claimed in claim 2, wherein in said slab continuous casting step: the casting blank drawing speed is controlled to be 1.0-1.2m/s.
4. The method for producing a high-precision low-yield-ratio steel strip for HP295 welded gas cylinders as claimed in claim 2, wherein in said slab heating step: the heating temperature and the heating furnace time are respectively controlled to be 1240-1270 ℃ and 170-190 min.
5. The method for producing a high-precision low-yield-ratio steel strip for HP295 welded gas cylinders as claimed in claim 2, wherein in the high-pressure descaling and finish rolling high-pressure descaling step: one group of rough descaling boxes with the pressure of 20-22 MPa, one pass of rough mill descaling, and two groups of finish rolling descaling boxes with the pressure of 19-21 MPa.
6. The method for producing a high-precision low-yield-ratio steel strip for HP295 welding gas cylinders as claimed in claim 2, wherein in the finish rolling 7 stand tandem rolling process: the inlet temperature of finish rolling is more than or equal to 1050 ℃, the finish rolling temperature is 850-880 ℃, and the thickness of the intermediate billet is designed to be 33-35mm; the rolling load is as follows: f1 42%, F2 36%, F3 29%, F4, F5%, F615%, F7%; the tension of the loop is respectively 4.90N per square meter, 5.39N per square meter, 5.88N per square meter, 6.86N per square meter, 8.82N per square meter and 9.80N per square meter; the rolling speeds are respectively as follows: 0.80m/s,1.38m/s,2.15m/s,3.04m/s,4.10m/s,5.00m/s,5.87m/s.
7. As claimed inThe method for producing a high-precision low-yield-ratio steel strip for HP295 welded gas cylinders according to claim 2 is characterized in that, in the U-shaped pipe laminar cooling process: the layer cooling mode is back-end cooling, the water cooling speed is 7-12 m/s, and the flow rate is set to be 180-220m 3 /h。
8. The method for producing the steel strip for the high-precision low-yield-ratio HP295 welded gas cylinder as claimed in claim 2, wherein in the coiling and packing process of the coiling machine: the coiling temperature is 600-650 ℃.
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| CN110899338A (en) * | 2019-11-29 | 2020-03-24 | 张家港宏昌钢板有限公司 | Preparation method of hot-rolled strip steel |
| CN112658029A (en) * | 2020-12-04 | 2021-04-16 | 安阳钢铁股份有限公司 | Hot-rolled steel strip performance control process for welded gas cylinder |
| CN113930674A (en) * | 2021-09-13 | 2022-01-14 | 广西柳州钢铁集团有限公司 | Welded bottle steel hot-rolled plate strip HP295 and manufacturing method thereof |
| CN113862577A (en) * | 2021-10-12 | 2021-12-31 | 新疆八一钢铁股份有限公司 | Production method of high-strength low-yield-ratio welded gas cylinder steel |
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