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Lamellar double-phase high-strength and high-toughness steel and preparation method thereof

A lamellar, high-toughness steel technology, applied in the field of high-toughness and high-strength steel, can solve the problems that the micro-region deformation capacity is difficult to reach 70% surface shrinkage, increase the cost of steel, etc., achieve huge market application potential, and improve comprehensive performance. , the effect of excellent high strength and high toughness matching performance

Active Publication Date: 2013-10-09
CENT IRON & STEEL RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For ultra-high-strength steel, it is difficult for its micro-region deformation ability to reach 70% area reduction (such as figure 2 shown)
Under the idea of ​​micro-deformation control, it can only be achieved by continuously improving the metallurgical quality of martensitic steel and strictly controlling the quantity, distribution and shape of inclusions in the steel, which will undoubtedly greatly increase the cost of steel

Method used

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  • Lamellar double-phase high-strength and high-toughness steel and preparation method thereof
  • Lamellar double-phase high-strength and high-toughness steel and preparation method thereof
  • Lamellar double-phase high-strength and high-toughness steel and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0071] Example 1: High-strength and high-toughness rod and wire

[0072] Steel smelting and forging:

[0073] The steel of the present invention is smelted by a laboratory vacuum induction furnace, and the casting ingot shape is a 50kg round ingot. A total of 10 furnaces of steel are smelted for forging rod-shaped samples. The chemical composition is shown in Table 1. The steel ingots of D1-D10# are heated at 1100-1250°C, kept for 2-5 hours, and then forged and opened. The forging temperature range is 800-1150°C, forging a square with an initial cross-sectional size of 40mmx40mm to a circle with a cross-sectional size of φ16mm, and air cooling after forging. Finally, it is forged into a bar with a size of φ16mm×1000mm and cooled by air cooling. This process can obtain acicular ferrite and martensite structure. Carry out the determination of mechanical properties and impact toughness (tensile test tensile rate is 10 -4 / s, the elongation rate is A5, impact test: V-shaped im...

Embodiment 2

[0080] Embodiment 2: Hot-rolled high-toughness plate

[0081] Steel smelting and hot rolling:

[0082] The steel of the present invention is smelted by a vacuum induction furnace in a laboratory, and the casting ingot shape is a 150kg round ingot. A total of 10 furnaces of steel are smelted for hot rolling. The chemical composition is shown in Table 3. The ingots of RZ1-RZ10# steel are heated at 1100-1250°C, held for 2-5 hours, and then forged and billeted. The forging temperature range is 800-1150°C, and the forging billet with an initial section size of 60mmx100mmx200mm. The forged billet is heated at 1100-1250°C, rolling is started at 1100-1200°C, and the final rolling temperature is about 800°C, wherein the reduction in the non-recrystallized zone at 1100-1000 degrees in the high-temperature dual-phase region accounts for 50% of the total reduction. %, while the reduction in the recrystallization zone at 1000-800 degrees is less than 50%. Evenly distribute the pass redu...

Embodiment 3

[0088] Embodiment 3: low temperature annealing and high temperature tempering treatment

[0089] Heat treatment of forged bars and hot-rolled plates:

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Abstract

The invention provides a lamellar double-phase high-strength and high-toughness steel and a preparation method thereof, belonging to the technical field of the high-strength and high-toughness steel. The steel has the following chemical components: 0.01-0.5 wt % C, 1.0-10.0 wt % of Mn, 1.0-6.0 wt % of Al, less than or equal to 0.020 wt % of P, less than or equal to 0.02 wt % of S, and the balance being Fe and unavoidable impurities. A preparation technology comprises smelting and solidification of steel, forging or hot rolling and hot continuous rolling of casting blank or casting ingot, and annealing of forged and hot-rolled products. The steel has advantages of easy industrial production, low cost, high strength and high toughness.

Description

technical field [0001] The invention belongs to the technical field of high-toughness and high-strength steel, and in particular provides a lamellar dual-phase high-strength high-toughness steel and a preparation method thereof, a low-cost and easy-to-produce lamellar ferrite-martensite dual-phase high-strength steel. Ductile steel products (plates and rods and wires) and methods for their preparation. technical background [0002] At present, iron and steel materials for automobiles and trains at home and abroad, wear-resistant materials for mining machinery and large-scale transportation machinery, high-performance steel materials for aerospace, pipeline steel for energy transportation, and various military armors all affect the strength and low temperature of materials. Toughness puts forward extremely high requirements, and strength and toughness have become the key indicators to determine whether steel materials are applied or not in engineering. For example, high-stre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/06C21D8/06C21D8/02C22C38/12C22C38/14
Inventor 曹文全董翰李晓源时捷王存宇徐乐王毛球惠卫军
Owner CENT IRON & STEEL RES INST
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