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Low-carbon equivalent high strength and toughness cast steel and preparation method thereof

A high-strength, toughness, carbon-equivalent technology, applied in the field of low-carbon-equivalent high-strength toughness cast steel and its preparation, can solve the problem of inability to balance welding performance and strength indicators, and achieve improved material strength and low-temperature toughness, grain refinement, and improved performance. The effect of cleanliness

Active Publication Date: 2013-12-11
武汉武船金属制造有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a kind of low-carbon equivalent high-strength toughness cast steel and its Preparation

Method used

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  • Low-carbon equivalent high strength and toughness cast steel and preparation method thereof
  • Low-carbon equivalent high strength and toughness cast steel and preparation method thereof
  • Low-carbon equivalent high strength and toughness cast steel and preparation method thereof

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Effect test

Embodiment 1

[0032] A method for preparing low-carbon equivalent high-strength toughness cast steel, comprising the following smelting, pouring and heat treatment, the specific process flow and process parameters are:

[0033] (1) Smelting process

[0034] Smelting in a 7-ton electric arc furnace, select dry, oil-free and less rusty Q235 steel plate (Cr0.28%, Cu0.06%) leftovers 6500Kg for smelting, when the scrap steel is completely melted and the temperature is 1537°C, take sample No. 1 , measured C0.53%, Ni0.25%, Mo0.08%, P0.035%. Add 35Kg of electrolytic nickel, 20Kg of FeMo60-A molybdenum-iron alloy, and then decarburize by blowing oxygen. During the decarburization process, slag is continuously released and new slag is formed. Observe the flame and the atmosphere in the furnace, and take sample No. 2 (C0.29%, Ni0.79% , Mo0.25%, P0.009%). When the measured temperature is 1593°C, add 20Kg of FeSi75Al0.5-A ferrosilicon alloy for pre-reduction, and continue to raise the temperature. Whe...

Embodiment 2

[0044] A method for preparing low-carbon equivalent high-strength toughness cast steel, comprising the following smelting, pouring and heat treatment, the specific process flow and process parameters are:

[0045] (1) Smelting process

[0046]Smelting in a 7-ton electric arc furnace, select dry, oil-free and less rusty Q235 steel plate (Cr0.28%, Cu0.07%) scrap 6500Kg for smelting, when the scrap steel is completely melted and the temperature is 1534 ° C, take sample No. 1 , measured C0.56%, Ni0.14%, Mo0.04%, P0.033%. Add 46Kg of electrolytic nickel plate, 24Kg of FeMo60-A molybdenum-iron alloy, and then decarburize by blowing oxygen. The decarburization process continuously releases slag and creates new slag. Observe the flame and the atmosphere in the furnace. Take No. 2 sample and measure C0.35%, Ni0 .80%, Mo0.24%, P0.007%. When the measured temperature is 1600°C, add 20Kg of FeSi75Al0.5-A ferrosilicon alloy for pre-reduction, and continue to heat up. When the temperature ...

Embodiment 3

[0056] A method for preparing low-carbon equivalent high-strength toughness cast steel, comprising the following smelting, pouring and heat treatment, the specific process flow and process parameters are:

[0057] (1) Smelting process

[0058] Smelting in a 7-ton electric arc furnace, select dry, oil-free and less rusty Q235 steel plate (Cr0.28%, Cu0.06%) scrap 6500Kg for smelting, when the scrap steel is melted and the temperature is 1545 °C, take sample No. 1 , measured C0.56%, Ni0.13%, Mo0.06%, P0.029%. Add 42Kg of electrolytic nickel, 23Kg of FeMo60-A molybdenum-iron alloy, and then decarburize by blowing oxygen. During the decarburization process, slag is continuously released and new slag is formed. Observe the flame and the atmosphere in the furnace, and take sample No. 2 (C0.29%, Ni0.79% , Mo0.26%, P0.005%). When the measured temperature is 1603°C, add 20Kg of FeSi75Al0.5-A ferrosilicon alloy for pre-reduction, and continue to raise the temperature. When the temperat...

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Abstract

The invention relates to a low-carbon equivalent high strength and toughness cast steel and a preparation method thereof. The low-carbon equivalent high strength and toughness cast steel comprises the following chemical components in percentage by weight: 0.14 to 0.18% of C, 0.30 to 0.60% of Si, 1.00 to 1.20% of Mn, 0.40 to 0.60% of Cr, 0.70% to 0.80% of Ni, 0.20 to 0.30% of Mo, not greater than 0.025% of P, not greater than 0.020% of S, 0.02 to 0.03% of V, 0.03 to 0.05% of Nb, not greater than 0.20% of Cu, and the balance of Fe. The preparation method is characterized by comprising the following steps: performing secondary refining through an electric-arc furnace and an AOD (Argon Oxygen Decarburization) furnace; and carrying out high-heat treatment. The low-carbon equivalent high strength and toughness cast steel and the preparation method thereof have the beneficial effects that the micro-alloying technology is introduced to the production of low-carbon cast steel, so that the strength as well as low-temperature toughness of the material can be greatly improved on the premise that high welding performance is remained; the electric-arc furnace and the AOD furnace are adopted for performing joint smelting; the decarburization quantity in the oxidization period can be improved, and phosphorus and other harmful elements in molten steel can be removed by the electric-arc furnace; the secondary deoxidation is performed by the AOD furnace, the argon is charged for refining, and thus oxide inclusion in the molten steel, and N, H, O and other gases can be removed as far as possible, and as a result, the cleanness of the molten steel can be greatly improved; and before hardening and tempering, the high-temperature pretreatment process is carried out, thus the crystal grain is refined, and a condition is created for finish heat treatment.

Description

technical field [0001] The invention belongs to the technical field of low-alloy steel material casting, and in particular relates to a low-carbon equivalent high-strength toughness cast steel and a preparation method thereof. Background technique [0002] Due to the harsh operating environment of the mine truck, poor working road conditions, low ambient temperature, long working hours, and large impact loads during work, its key components - supporting shafts and other castings are required to have high yield strength (not less than 585Mpa) and tensile strength (not less than 725Mpa), good plasticity (elongation not less than 20%) and toughness (impact at -40°C not less than 27J), and good weldability (carbon equivalent Cev≤0.60%) . [0003] The chemical composition and mechanical properties of 4B in the American standard ASTM A487 "Standard Specification for Steel Castings Suitable for Pressure Service" are as follows: [0004] [0005] When the ASTMA4874B material me...

Claims

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Application Information

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IPC IPC(8): C22C38/48C22C33/04C21C7/06C21C7/068C21D6/00
CPCY02P10/20
Inventor 邓学林喻尚钟于建才谢国峰周悠王小虎
Owner 武汉武船金属制造有限责任公司
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