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CN-122013037-A - High corrosion-resistant thin-specification high-strength steel strip and heat treatment and manufacturing method thereof

CN122013037ACN 122013037 ACN122013037 ACN 122013037ACN-122013037-A

Abstract

The invention provides a high corrosion-resistant thin-specification high-strength steel belt and a heat treatment and manufacturing method thereof, and relates to the technical field of steel material manufacturing. The high corrosion-resistant thin-specification high-strength steel strip comprises the following chemical components ：C：0.60~0.65%、Si：0.15~0.25%、Mn：0.20~0.40%、Alt：0.020~0.030%、Cr：0.20~0.40%、Ni：1.30~1.60%、Cu：0.10~0.20%、Ca：0.0010~0.0025%、P≤0.012%、S≤0.002%、H≤1.5ppm、O≤45ppm、N≤45ppm, in percentage by weight, and the balance of Fe and unavoidable impurity elements. The invention provides a manufacturing method of a thin steel strip with excellent corrosion resistance, which is characterized in that the thin steel strip is obtained through the whole process design of smelting, continuous casting, hot continuous rolling, annealing, cold rolling and thermal refining, and has the advantages of low cost, high strength and excellent corrosion resistance, and is suitable for preparing saw blade cutting materials.

Inventors

  • HE BO
  • HU XUEWEN
  • WANG FEI
  • WANG HAIBO
  • ZHANG YUGUANG
  • DAI SIYUAN
  • WANG LIBING
  • WEN CHENGCAI
  • GUO RUI

Assignees

  • 马鞍山钢铁有限公司

Dates

Publication Date
20260512
Application Date
20260129

Claims (10)

  1. 1. A high corrosion-resistant thin-specification high-strength steel strip is characterized by comprising the following chemical components in percentage by weight ：C：0.60~0.65%、Si：0.15~0.25%、Mn：0.20~0.40%、Alt：0.020~0.030%、Cr：0.20~0.40%、Ni：1.30~1.60%、Cu：0.10~0.20%、Ca：0.0010~0.0025%.
  2. 2. The high corrosion resistant thin gauge high strength steel strip of claim 1, wherein the high strength steel strip has a thickness of no more than 2mm, a yield strength of no less than 1050MPa, a tensile strength of no less than 1250MPa, an elongation of no less than 10%, a vickers hardness HV of 0.5 no less than 390, a rockwell hardness HRC of no less than 40, a nonmetallic inclusion in the steel of no more than 8 μm in size, an average size of no more than 2 μm, and a nonmetallic inclusion number of no more than 3 μm in size of no less than 81%.
  3. 3. The heat treatment method of the high-corrosion-resistance thin-specification high-strength steel strip according to claim 1 or 2 is characterized by comprising the step of carrying out heat treatment on the steel strip subjected to cold rolling, wherein the heat treatment comprises quenching and tempering, the quenching heat preservation temperature is 900-950 ℃ in the quenching process, the heat preservation time is 10-15 min, the tempering heat preservation temperature is 500-550 ℃ in the tempering process, and the heat preservation time is 10-15 min.
  4. 4. The method for manufacturing the high-corrosion-resistance thin-specification high-strength steel strip according to claim 1 or 2, which is characterized by comprising the steps of molten iron pretreatment, converter smelting, refining, continuous casting, hot continuous rolling, annealing and cold rolling, wherein nickel pig iron and recycled copper are adopted as a nickel source and a copper source in the converter smelting.
  5. 5. The method according to claim 4, wherein in the refining step, the weak stirring time of the bottom blowing argon is not less than 15 minutes, the non-metallic inclusion is denatured by a calcium-feeding line, the feeding line speed is 150-180 m/min, and the degassing time of the RH vacuum treatment is not less than 15 minutes.
  6. 6. The manufacturing method of the continuous casting machine according to claim 4, wherein in the continuous casting process, argon-blowing protection casting is carried out in the whole process, the temperature of molten steel in a tundish is controlled to 1480-1495 ℃, the fluctuation range of the liquid level is stably controlled to +/-3 mm, weak cooling is adopted in a secondary cooling section, the drawing speed of a continuous casting blank is controlled to be 1.0-1.3 m/min, and the casting blank is directly fed into a heating furnace after being cut, wherein the feeding temperature of the casting blank is more than or equal to 650 ℃.
  7. 7. The method according to claim 4, wherein in the hot continuous rolling step, the heating temperature of the cast slab is 1190-1230 ℃, the holding time is 120-150 min, a weak reducing atmosphere is adopted in the heating furnace, the air excess coefficient is 0.9-1.0, after the cast slab leaves the heating furnace, the surface scale is removed by high-pressure water, the descaling water pressure is 190-230 bar, the rough rolling temperature is controlled above 1060 ℃, the cumulative reduction rate is more than or equal to 80%, the surface scale is removed by ultrahigh-pressure water before the intermediate slab enters the finishing mill, the descaling water pressure is 310-340 bar, the scale removal water between the finishing mill frames is fully opened, the finish rolling temperature is 880-920 ℃, the cooling speed in the process of cooling to the coiling temperature after finish rolling is 20-30 ℃ per second, and the coiling temperature is 620-660 ℃.
  8. 8. The method according to any one of claims 4 to 7, wherein the annealing step is performed at an annealing temperature of 700 to 750 ℃ for 4 to 6 hours, and the annealing step comprises heating the hot rolled steel coil to 500 to 550 ℃ at 80 to 100 ℃ per hour, then heating the hot rolled steel coil to 700 to 750 ℃ at 15 to 20 ℃ per hour, and then cooling the hot rolled steel coil to 80 ℃ or lower along with the annealing step for 4 to 6 hours.
  9. 9. The method according to claim 8, wherein the total rolling reduction is controlled to be not less than 50% and the thickness of the steel strip is controlled to be not more than 2mm in the cold rolling process, and the cold rolled steel strip is subjected to heat treatment.
  10. 10. Use of the high corrosion resistant thin gauge high strength steel strip of claim 1 or 2 in the manufacture of saw blade cutting materials.

Description

High corrosion-resistant thin-specification high-strength steel strip and heat treatment and manufacturing method thereof Technical Field The invention relates to the technical field of steel material manufacturing, in particular to a high-corrosion-resistance thin-specification high-strength steel strip and a heat treatment and manufacturing method thereof. Background The medium-high carbon steel has high hardness and excellent wear resistance, and is widely applied to saw blade manufacturing. When the saw blade cuts a material, a large amount of heat is generated due to the friction between the high-speed rotation and the material, the high-temperature causes the saw blade matrix to soften, and the deformation resistance is reduced, so that the cooling treatment is needed when the material is cut. Spray cooling is a common cooling mode, but the cooling liquid often contains a higher concentration of Cl - (> 300 mg/l), resulting in increased blade corrosion. Particularly, the thin saw blade is more obviously affected by corrosion, so that the development of a thin high-strength steel belt with excellent corrosion resistance is required, and the service life of the saw blade is prolonged. Aiming at the problems, the Chinese application with the application number of CN202410008420.8 discloses high-cleanliness corrosion-resistant saw blade steel for cutting middle-low-end stones and a production method thereof, wherein the high-cleanliness corrosion-resistant saw blade steel comprises, by weight, 0.45-0.82% of C, 0.16-0.47% of Si, 0.20-1.20% of Mn, 0.20-1.00% of Cr, 0.01-0.06% of V, less than or equal to 0.010% of P, less than or equal to 0.005% of S, and the balance of iron and unavoidable impurities. The scheme mainly improves the cleanliness of molten steel through control of a smelting process, controls the grade of class D nonmetallic inclusion to be less than or equal to 0.5 grade, avoids the formation of primary cell corrosion by large-size inclusion, improves the corrosion resistance of materials, does not relate to a subsequent manufacturing process of the materials, and does not record whether the method is suitable for production of thin-specification steel strips. The invention of China with the application number of CN201410059352.4 discloses a corrosion-resistant high-carbon steel alloy material and a preparation method thereof, wherein the chemical element components and the mass percentage thereof are ：C：0.7-1.0%、Si：0.7-0.9%、Cu：0.2-0.4%、Al：0.05-0.08%、Mn：2.5-3.5%、Ni：6.0-6.5%、Ti：0.05-0.09、B：0.3-0.5、Mo：0.1-0.3、Nb：0.002-0.005、Ta：0.001-0.003%、Co：0.03-0.05、P≤0.030、S≤0.030、, and the balance is iron. The scheme adopts direct heat treatment after casting, is not suitable for the production of thin-specification plates and strips, has the content of noble alloy Ni as high as 6.0-6.5%, further contains noble metals such as Mo, co and the like, and has higher manufacturing cost. Therefore, there is a need to provide a low cost production method suitable for high corrosion resistant thin high strength steel strip to solve the corrosion resistant problem of the thin high strength steel strip and to increase the service life of the saw blade. Disclosure of Invention In order to overcome the defects of the technology, the invention aims to provide a high-corrosion-resistance thin high-strength steel strip and a heat treatment and manufacturing method thereof, and solve the problem of corrosion resistance of the thin high-strength steel strip. In order to achieve the above purpose, the technical scheme adopted by the invention is as follows: the high corrosion-resistant thin-specification high-strength steel strip is characterized by comprising the following chemical components in percentage by weight ：C：0.60~0.65%、Si：0.15~0.25%、Mn：0.20~0.40%、Alt：0.020~0.030%、Cr：0.20~0.40%、Ni：1.30~1.60%、Cu：0.10~0.20%、Ca：0.0010~0.0025%. As a preferable scheme, the high-strength steel strip also comprises the following chemical components in percentage by weight, P is less than or equal to 0.012%, S is less than or equal to 0.002%, H is less than or equal to 1.5ppm, O is less than or equal to 45ppm, N is less than or equal to 45ppm, and the balance is Fe and unavoidable impurity elements. As a preferable scheme, the yield strength of the high-strength steel belt is equal to or more than 1050MPa, the tensile strength is equal to or more than 1250MPa, the elongation is equal to or more than 10%, the Vickers hardness HV0.5 is equal to or more than 390, the Rockwell hardness HRC is equal to or more than 40, the size of nonmetallic inclusion in the steel is equal to or less than 8 mu m, the average size is equal to or less than 2 mu m, and the quantity of nonmetallic inclusion with the size of less than or equal to 3 mu m is equal to or more than 81%. As a preferable scheme, the thickness of the high-strength steel belt is less than or equal to 2mm. The alloy elements and the mass percentage design principle of the alloy elements wi