Low-cost high-strength high-toughness shock-proof refractory steel and preparation technique thereof

A high-strength, high-toughness, preparation process technology, applied in the direction of manufacturing tools, metal rolling, metal rolling, etc., can solve the problems of high alloy cost and process cost, complex production methods, etc., and achieve low alloy cost, less content, and process low cost effect

Active Publication Date: 2011-09-14
INST OF RES OF IRON & STEEL JIANGSU PROVINCE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The invention patent with publication number CN1354273A discloses a refractory and weather-resistant steel with excellent weldability but high alloy composition content. Its production method (controlled rolling + normalizing + tempering) is also complicated, and the alloy cost and process cost are high
[0004] So far, there have been no reports of refractory steel products with high strength (room temperature yield ≥ 460MPa), high toughness, shock resistance (yield strength ratio ≤ 0.8) and no precious alloying elements such as Cr and Ni.

Method used

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  • Low-cost high-strength high-toughness shock-proof refractory steel and preparation technique thereof
  • Low-cost high-strength high-toughness shock-proof refractory steel and preparation technique thereof
  • Low-cost high-strength high-toughness shock-proof refractory steel and preparation technique thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Embodiment 1: The chemical composition of the steel grade of this embodiment is shown in Table 2, and the balance is Fe and unavoidable inclusions. The preparation process is as follows: according to the chemical composition requirements of the steel grade of this embodiment, the molten steel is obtained by smelting in a 150kg vacuum induction furnace; The molten steel is poured into steel ingots, then heated to 1180-1230°C and held for 2-3 hours, and then out of the furnace for rough rolling at 1100°C with a reduction rate of 0.6; after the rough rolling, the 60mm thick rolled plate is kept warm on the roller table; finish rolling The starting temperature is 880°C, the final rolling temperature is 860°C, and rolled to a thickness of 20mm; after rolling, the rolled plate is cooled to 500°C at a rate of 9°C / s and then air-cooled to room temperature to produce the target steel plate. The physical mechanical properties of the rolled plate are shown in Table 3.

Embodiment 2

[0024] Embodiment 2: The chemical composition of the steel grade in this embodiment is shown in Table 2, and the balance is Fe and unavoidable inclusions. The preparation process is as follows: according to the chemical composition requirements of the steel grade in this embodiment, vacuum induction smelting is used to obtain molten steel; the molten steel is poured After being heated and kept warm, it is rolled out of the furnace at 1030°C, and the thickness of the steel plate is rolled from 150mm to 75mm; after being heated, it is rolled at 900°C, and the thickness of the steel plate is rolled from 75mm to 30mm; after rolling, the plate is rolled at a rate of 6°C / s Speed ​​cooling to 550°C and air cooling to room temperature to produce the target steel plate. The physical mechanical properties of the rolled plate are shown in Table 3.

Embodiment 3

[0025] Example 3: The chemical composition of the steel in this example is shown in Table 2, and the balance is Fe and unavoidable inclusions. The preparation process is basically similar to that of Example 1-2, but after the billet is heated and kept warm, it starts at 1060°C Rolling, the thickness of the steel ingot is rolled from 170mm to 80mm; after being heated, it is rolled at 860°C, and the thickness of the rolled plate is rolled from 80mm to 30mm; after rolling, it is cooled to 600°C at a speed of 15°C / s and then air-cooled to room temperature to obtain the target steel plate. The physical mechanical properties of the rolled plate are shown in Table 3.

[0026] It can be seen that, by reducing the addition of alloy elements, the present invention can still obtain a comprehensive combination of room temperature yield strength ≥ 460MPa, 600°C yield strength ≥ 307MPa, yield ratio ≤ 0.8, and 0°C impact energy ≥ 47J by reducing the addition of alloying elements. Good fire-...

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Abstract

The invention relates to a low-cost high-strength high-toughness shock-proof refractory steel and a preparation technique thereof. The steel comprises the following components in percentage by weight: 0.05-0.09% of C, 0.10-0.30% of Si, 0.60-1.00% of Mn, 0.20-0.40% of Mo, less than 0.10% of Cr, less than 0.10% of Cu, less than 0.10% of Ni, 0.02-0.04% of Nb, 0.01-0.04% of V, 0.01-0.04% of Ti, 0.02-0.04% of Al, at most 0.006% of N, at most 0.010% of P, at most 0.006% of S, and the balance of Fe and impurities. The preparation technique sequentially comprises the steps of temperature keeping, two-stage rolling and cooling. The steel provided by the invention adopts an Mo+Nb alloy system, and has the advantages of simple composition, low content of precious alloy elements, low alloy cost, highyield strength, favorable shock resistance and favorable impact toughness; and due to the adoption of the advanced controlled rolling and controlled cooling technologies, the cost of the technique islow.

Description

technical field [0001] The invention belongs to the field of low-alloy high-strength steel manufacturing, and particularly relates to a room temperature yield strength ≥ 460MPa, a yield ratio ≤ 0.80, a 600°C yield strength ≥ 2 / 3 of the room temperature yield strength (ie ≥ 307MPa), and good impact toughness ( 0°C impact energy ≥ 47J) low-cost refractory steel and its preparation process. Background technique [0002] For large steel structures, industry codes and standards require that a fire-resistant coating be applied to the surface of the steel structure to enhance fire resistance. Spraying the fireproof coating is labor-intensive and time-consuming, pollutes the environment, prolongs the construction period and increases the construction cost. The development and application of refractory steel can reduce or cancel the refractory coating to reduce construction costs. In the 1980s, Japan's Nippon Steel Corporation took the lead in launching commercial refractory steel ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/50C22C38/28C22C38/16C22C38/14B21B37/00
Inventor 张宇潘鑫郭慧英
Owner INST OF RES OF IRON & STEEL JIANGSU PROVINCE
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