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A method of manufacturing low-alloy ultra-high-strength steel

A technology of ultra-high-strength steel and low-alloy, which is applied in the field of preparation of low-alloy ultra-high-strength steel. Purity, the effect of optimizing the smelting process

Active Publication Date: 2022-04-19
AVIC SHANGDA METAL REGENERATION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main elements are Mn, Cr, Si, Ni, Mo, V, etc. The total content of alloy elements generally does not exceed 5%, and the 30CrMnSiNi2 steel produced from this defect: Chassis 1 has high tensile strength, relatively poor toughness and plasticity ;Inverted bottom mold 2 is produced by vacuum induction + electroslag, and the purity is relatively not optimal; Inverted top mold 3 has no elements to refine grains, and the normalizing grain size level after forging is only 5 class

Method used

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  • A method of manufacturing low-alloy ultra-high-strength steel
  • A method of manufacturing low-alloy ultra-high-strength steel
  • A method of manufacturing low-alloy ultra-high-strength steel

Examples

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Comparison scheme
Effect test

Embodiment 1

[0027] The invention provides a technical solution: a low-alloy ultra-high-strength steel. The formula of the low-alloy ultra-high-strength steel includes the following components: C: 0.30%, Mn: 1.0%, Si: 1.50%, S: 0.010% , P: 0.010%, Ni: 1.45%, Al: 0.03%, Cr: 0.80%, V: 0.08%, H: 0.0001%, O: 0.0015%, N: 0.010%, the balance is Fe and other unavoidable Impurities.

[0028] A method for manufacturing a low-alloy ultra-high-strength steel as described above, the preparation method includes the following steps:

[0029] S1: Quantitative weighing, all raw materials are weighed according to the above components;

[0030] S2: Smelting, using the smelting process of vacuum induction furnace smelting casting + vacuum self-consumption remelting to smelt raw materials into steel ingots;

[0031] S3: Forging, heat the consumable steel ingot to 1220°C and keep it warm for more than 25 hours, then diffuse to make the carbides dispersed and distributed, after diffusion, it is out of the fur...

Embodiment 2

[0037] The present invention provides a technical solution: a low-alloy ultra-high-strength steel, the formula of the low-alloy ultra-high-strength steel includes the following components: C: 0.35%, Mn: 1.5%, Si: 1.80%, S: 0.08% , P: 0.09%, Ni: 1.85%, Al: 0.08%, Cr: 1.20%, V: 0.15, H: 0.00008%, O: 0.0014%, N: 0.009%, the balance is Fe and other unavoidable impurities .

[0038] A method for manufacturing a low-alloy ultra-high-strength steel as described above, the preparation method includes the following steps:

[0039] S1: Quantitative weighing, all raw materials are weighed according to the above components;

[0040] S2: Smelting, using the smelting process of vacuum induction furnace smelting casting + vacuum self-consumption remelting to smelt raw materials into steel ingots;

[0041] S3: Forging, heat the consumable steel ingot to 1220°C and keep it warm for more than 25 hours, diffuse and distribute the carbides, after diffusion, it is out of the furnace for forging,...

Embodiment 3

[0047] The invention provides a technical solution: a low-alloy ultra-high-strength steel. The formula of the low-alloy ultra-high-strength steel includes the following components: C: 0.32%, Mn: 1.2%, Si: 1.60%, S: 0.007% , P: 0.006%, Ni: 1.55%, Al: 0.05%, Cr: 0.90%, V: 0.10%, H: 0.00007%, O: 0.0013%, N: 0.007%, the balance is Fe and other unavoidable Impurities.

[0048] A method for manufacturing a low-alloy ultra-high-strength steel as described above, the preparation method includes the following steps:

[0049] S1: Quantitative weighing, all raw materials are weighed according to the above components;

[0050] S2: Smelting, using the smelting process of vacuum induction furnace smelting casting + vacuum self-consumption remelting to smelt raw materials into steel ingots;

[0051] S3: Forging, heat the consumable steel ingot to 1220°C and keep it warm for more than 25 hours, diffuse and distribute the carbides, and then take out the furnace for forging. In the best ther...

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Abstract

The invention discloses a low-alloy ultra-high-strength steel. The formula of the low-alloy ultra-high-strength steel includes the following components: C: 0.30-0.35%, Mn: 1.0-1.5%, Si: 1.50-1.80%, S≤ 0.010%, P≤0.010%, Ni: 1.45‑1.85%, Al: 0.03‑0.08%, Cr: 0.80‑1.20%, V: 0.08‑0.15%, H: ≤0.0001%, O: ≤0.0015%, N: ≤0.010%, the balance is Fe and other unavoidable impurities. The invention also discloses a method for manufacturing low-alloy ultra-high-strength steel. The preparation method includes the following steps: quantitative weighing, smelting, forging, normalizing, First tempering, quenching, and secondary tempering; compared with the existing 30CrMnSiNi2, the low-alloy ultra-high-strength steel proposed by the present invention optimizes the smelting process and adjusts it to the smelting method of vacuum induction + vacuum self-consumption. The steel ingot uses high temperature before thermal processing Diffusion technology can reduce the dispersion of carbides. Through the adjustment of chemical composition and the change of smelting method, its purity is improved, the structure is refined, and the grain is finer, so that the strength, toughness and plasticity are all improved.

Description

technical field [0001] The invention relates to the technical field of preparation of low-alloy ultra-high-strength steel, in particular to a method for manufacturing low-alloy ultra-high-strength steel. Background technique [0002] Ultra-high-strength steel is a steel whose tensile strength at room temperature exceeds 1400MPa and yield strength exceeds 1300MPa. In addition to requiring a tensile strength above 1400MPa, ultra-high-strength steel must also have certain plasticity and toughness, as small as possible notch sensitivity, high fatigue strength, good public welfare, conform to resource conditions, and low price. Therefore, a variety of low-alloy ultra-high-strength steels have been developed. It is widely used in aircraft landing parts, bulletproof steel plates and other fields, and its application range is still expanding, and it has broad development prospects. [0003] At present, low-alloy ultra-high-strength steel is developed on the basis of quenched and t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/46C22C38/34C22C38/06C22C33/04C21D8/00C21D1/18C21D1/28B22D7/08
CPCC22C38/46C22C38/34C22C38/06C22C33/04C21D8/00C21D1/18C21D1/28B22D7/08
Inventor 孙海涛栾吉哲钟庆元刘军凯冯文静
Owner AVIC SHANGDA METAL REGENERATION TECH
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