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Alloy structural steel for large-scale drilling tools and its smelting method
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A technology of alloy structural steel and smelting method, which is applied in the field of steel and its smelting, alloy structural steel for large-scale drilling tools and its smelting, and can solve the problem of unsatisfactory new changes and new requirements, strength, toughness, hardenability and quenching. Low hardness and high alloy content
Inactive Publication Date: 2016-01-20
XINING SPECIAL STEEL
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[0009] Although 23CrNi3MoA steel is suitable for manufacturing large-scale drilling tools, the strength, toughness, hardenability and hardenability of the steel after air quenching are all low, and the alloy content is high and the cost is high;
[0011] With the development of the brazing tool industry, newer requirements are put forward for the manufacture of large-scale, high-quality brazing tools. The product specifications of the brazing tools continue to increase, and the inherent quality of materials: strength, toughness, processing performance, energy saving and environmental protection, etc. New requirements, the original materials can no longer meet this new change and new demand
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Embodiment 1
[0044] 1. Ingredients
[0045] The furnace charge is composed of return from the factory, return of the steel type, and pig iron; the carbon content is required to be 1.2-1.5%.
[0046] Two, electric furnace oxidation
[0047] Adjust the amount of lime, fluorite and light-burned dolomite according to the slag condition, and control the total amount of slag to 40-50Kg / t.
[0048] After full melting, the temperature is ≥1580°C, and oxidation begins; the oxygen blowing pressure is controlled at 0.5-0.7MPa; the decarburization amount is ≥0.40%, and iron ore is added in batches during the process, and the total amount is controlled at 7-10Kg / t.
[0049] Composition and content of the end point of oxidation: meet the requirements of C ≥ 0.06%, meet the requirements of P ≤ 0.010%; add 2.5-3.5 kg of ferromanganese per ton of steel to do manganese boiling; slag removal temperature is greater than 1630 ° C (even), slag removal Amount ≥ 95%.
[0050] 3. Initial reduction of electric f...
Embodiment 2
[0082] 1. Ingredients
[0083] The charge is returned by CrNiMo (CrNi2Mo, CrMo, CrNi), and 2.5kg-3.5kg of waste electrode blocks are added per ton of steel. The iron alloy is baked, and the nickel plate is dehydrogenated and annealed.
[0084] Two, electric furnace oxidation
[0085] Adjust the amount of lime, fluorite and light-burned dolomite according to the slag condition, and control the total amount of slag to 30-40Kg / t.
[0086] After full melting, the temperature is ≥1580°C, and oxidation begins; the oxygen blowing pressure is controlled at 0.5-0.7MPa; the decarburization amount is ≥0.20%.
[0087] Composition and content of the end point of oxidation: meet the requirements of C ≥ 0.06%, meet the requirements of P ≤ 0.010%; add 2.5kg-3.5kg of ferromanganese per ton of steel to make manganese boiling; the temperature of slag removal is greater than 1630 ℃ (even), pick up Slag content ≥ 95%.
[0088] 3. Initial reduction of electric furnace
[0089] Slag content 12-...
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Abstract
The invention discloses alloy structural steel for large-specification soldering tools. The alloy structural steel is characterized by comprising the following chemical components in percentage by weight: 0.23-0.26% of C, 1.30-1.65% of Si, 1.10-1.40% of Mn, 0.40-0.60% of Cr, 1.70-1.90% of Ni, 0.50-0.70% of Mo, 0.15-0.25% of V, not more than 0.020% of P, not more than 0.015% of S, not more than 0.20% of Cu and the balance of Fe; and the mechanical properties of the alloy structural steel are as follows: Rm is not less than 1600MPa, Rel is not less than 1300MPa, A is not less than 11.5%, Z is not less than 45% and AKU2 is not less than 85J. The alloy structural steel disclosed by the invention has the beneficial effects that the new alloy structural steel with more excellent mechanical properties in comparison with existing high-quality steel FF710, 23CrNi3MoA, XGQ25 and the like for the soldering tools is provided by designing new chemical components, the Rm is not less than 1600MPa, the Rel is not less than 1300MPa, the A is not less than 11.5%, the Z is not less than 45%, the AKU2 is not less than 85J, and the alloy structural steel has good quenching degree and hardenability, and can completely meet the using requirements of large-specification soldering tool (phi 550mm) products.
Description
technical field [0001] The invention relates to a steel and a smelting method thereof, in particular to an alloy structural steel for large-scale drilling tools and a smelting method thereof, belonging to the field of metal materials. Background technique [0002] With the continuous prosperity of the national economy, it has driven the comprehensive and rapid development of national economic infrastructure such as domestic mining, urban construction, ports, highways, and railways, and the so-called "industrial teeth" industry has also achieved great development. . [0003] At present, in the manufacture of drilling tools, the domestic usually use the drilling tool manufacturing material FF710 produced by Fagersta Company of Sweden, the 23CrNi3MoA steel used by Timken Company and the XGQ25 produced by Xining Special Steel. Table 1 and Table 2 are these steels. The comparison of chemical composition and mechanical properties. [0004] Table 1 Chemical composition comparison...
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Application Information
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