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High-strength hardened and tempered steel and production method thereof
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A production method and technology for quenched and tempered steel, applied in the direction of temperature control, rolling force/roll gap control, etc., can solve the problems of high carbon equivalent, affect welding performance, high cost, reduce environmental pollution, improve service life, reduce The effect of usage
Active Publication Date: 2009-08-05
HUNAN VALIN XIANGTAN IRON & STEEL CO LTD
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Problems solved by technology
The most prominent problem of the tempered steel produced by the existing technology is that the carbon equivalent is high, reaching 0.5% to 0.65% or even higher, which seriously affects the welding performance, the low-temperature impact toughness of the steel plate is unstable, more alloying elements are added, and the production cost High lead to failure to meet user requirements
In view of the disadvantages of high carbon content, high alloy content and high carbon equivalent of traditional quenched and tempered steel, such as high cost and unsatisfactory welding performance, how to control the carbon equivalent below 0.5% and develop a low carbon equivalent has good The new quenched and tempered high-strength steel with welding performance can meet the requirements of the market, which is of positive significance
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Embodiment 1
[0034] Add molten iron and steel scrap during converter smelting, the proportion of molten iron and steel scrap is (85%-95%): (5%-15%); then add silicon-manganesealloy: Si≥17.0%, Mn≥65.0%, S≤0.04 %, P≤0.25%, C≤1.8%, iron balance; medium carbon ferromanganese alloy: Si≤1.5%, Mn≥78.0%, S≤0.03%, P≤0.20%, C≤1.5%, iron balance; Low-carbon ferrochrome: Cr≥52.0%, C≤0.50%, Si≤3.0%, P≤0.06%, S≤0.05%, iron balance; niobium-iron alloy: Nb≥63.0%, Al≤3.0%, Si≤3.0 %, C≤0.20%, P≤0.20%, S≤0.10%, iron balance; ferromolybdenum: 55.0%≤Mo≤65.0%, Si≤1.5%, S≤0.10%, P≤0.05%, C≤ 0.10%, Cu≤0.50%, Sb≤0.05%, Sn≤0.06%, iron balance; nickel plate: nickel 99.9%~100%, impurity balance; vanadium iron: V≥50.0%, C≤0.75%, Si ≤2.5%, P≤0.10%, S≤0.05%, Al≤0.8%, Mn≤0.50%; ferroboron: 14.0%≤B≤19.0%, Si≤4.0%, P≤0.10%, S≤0.01%, C≤0.1%, Al≤6.0%; silicon aluminum barium: Si≥35.00%, Al≥12.00%, Ba≥18.00%, Al+Ba≥30.00%, P≤0.05%, S≤0.10%; siliconcalciumbarium: Si≥50.0%, Ba>13.5%, Ca>12.5%, Ba+Ca≥28.0%, P≤0.10%, S≤0.15...
Embodiment 2
[0038] Add molten iron and steel scrap during the converter smelting process, the proportion of molten iron and steel scrap is: (85-95%): (5-15%); then add silicon-manganese alloy: Si≥17.0%, Mn≥65.0%, S≤0.04% , P≤0.25%, C≤1.8%, iron balance; medium carbon ferromanganese alloy: Si≤1.5%, Mn≥78.0%, S≤0.03%, P≤0.20%, C≤1.5%, iron balance; low Carbon-chromiumferroalloy: Cr≥52.0%, C≤0.50%, Si≤3.0%, P≤0.06%, S≤0.05%, iron balance; niobium-iron alloy: Nb≥63.0%, Al≤3.0%, Si≤3.0% , C≤0.20%, P≤0.20%, S≤0.10%, iron balance; ferromolybdenum: 55.0%≤Mo≤65.0%, Si≤1.5%, S≤0.10%, P≤0.05%, C≤0.10% , Cu≤0.50%, Sb≤0.05%, Sn≤0.06%, iron balance; nickel plate: nickel 99.9-100%, impurity balance; vanadium iron: V≥50.0%, C≤0.75%, Si≤2.5% , P≤0.10%, S≤0.05%, Al≤0.8%, Mn≤0.50%; ferroboron: 14.0%≤B≤19.0%, Si≤4.0%, P≤0.10%, S≤0.01%, C≤0.1 %, Al≤6.0%; silicon aluminum barium: Si≥35.00%, Al≥12.00%, Ba≥18.00%, Al+Ba≥30.00%, P≤0.05%, S≤0.10%; silicon calcium barium: Si≥50.0 %, Ba>13.5%, Ca>12.5%, Ba+Ca≥28...
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Abstract
The invention discloses high-strength quenched and tempered steel and a production method thereof, wherein the high-strength quenched and tempered steel comprises alloy elements according to percentages by weight of 0.07-0.11 percent of C, 0.20-0.40 percent of Si, 1.48-1.60 percent of Mn, less than or equal to 0.025 percent of P, less than or equal to 0.005 percent of S, 0.04-0.06 percent of Nb, 0.012-0.02 percent of Ti, 0.02-0.06 percent of Al, 0.18-0.40 percent of Ni, 0.25-0.35 percent of Cr, 0.18-0.35 percent of Mo, 0.0008-0.0015 percent of B, 0.04-0.07 percent of V, the rest of Fe and unavoidable impurities. The production method comprises the process flows: 1. raw material preparation, 2. converter smelting, 3. LF refining, 4. VD vacuum degassing, 5. continuous casting, 6. heating in a heating furnace, 7. rough rolling, 8. finishing rolling, 9. ACC cooling control, 10. austenitizing in a quenching furnace, 11. water quenching in a quenchingmachine, 12. tempering in a tempering furnace, and 13. storing finished products. The invention is suitable for producing high-tenacity and high-strength quenched and tempered steel with excellent welding performance.
Description
technical field [0001] The invention relates to a high-strength quenched and tempered steel and a production method thereof, in particular to a high-toughness high-strength quenched and tempered steel with excellent welding performance and a production method thereof. Background technique [0002] High toughness and high strength quenched and tempered steel with excellent welding performance is a new steel type with high technology content and high added value. In addition to high yield strength and tensile strength, it also has good elongation performance and cold bending performance. , welding performance and impact resistance, mainly used in coal machinery industry, construction machinery industry and steel structure industry. In practical applications, compared with other steels, high toughness and high strength quenched and tempered steel with excellent welding performance can reduce the amount of steel used, increase the service life of steel, and save resources. There...
Claims
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