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A kind of production method of low-alloy ultra-high-strength steel and its casting

A technology of ultra-high-strength steel and production methods, which is applied in the field of metal smelting, can solve problems such as unsatisfactory use requirements, serious element burning loss, poor working environment, etc., and achieve the effects of improving the company's image, less oxidation and decarburization, and low cost

Active Publication Date: 2019-03-01
JIANGSU DINGTAI ENG MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Patent CN20141024122.4 discloses a method of preparing low-alloy high-strength cast steel by using an electric arc furnace. The electric arc furnace has strong melting, oxidation and reduction capabilities, strong metallurgical ability, and convenient composition adjustment, but the burning loss of elements in electric arc furnace smelting is serious , high energy consumption, relatively poor working environment; and cannot meet the requirements of aerospace, rail transit, national defense and other important industrial fields

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] The manufacture of the low-alloy ultra-high-strength steel casting of the present embodiment comprises the following steps:

[0047] The low-alloy high-strength and tough cast steel prepared by medium-frequency induction furnace includes the following raw materials in mass percentage: 0.20% carbon, 0.70% manganese, 0.45% silicon, 0.65% chromium, 0.65% nickel, 0.50% molybdenum, 0.015% niobium, and 0.05% vanadium , sulfur ≤ 0.01%, phosphorus ≤ 0.01%, the balance is iron and unavoidable impurities.

[0048] It is smelted in an intermediate frequency induction furnace with a 150kg basic furnace lining, and each furnace smelts 125kg.

[0049] Melting process: A. Open the intermediate frequency melting furnace and debug it, add 125kg of high-purity iron to melt it; after the high-purity iron is dissolved, add appropriate fluorite to remove slag 3 times.

[0050] B. After the slag removal is completed, add a carburant with a good ratio to the molten iron for carburization. Duri...

Embodiment 2

[0057] The manufacture of the low-alloy ultra-high-strength steel casting of the present embodiment comprises the following steps:

[0058] The low-alloy high-strength and tough cast steel prepared by medium-frequency induction furnace includes the following raw materials in mass percentage: carbon 0.26%, manganese 0.60%, silicon 0.60%, chromium 0.65%, nickel 0.45%, molybdenum 0.70%, niobium 0.10%, vanadium 0.04% , sulfur ≤ 0.01%, phosphorus ≤ 0.01%, the balance is iron and unavoidable impurities.

[0059] It is smelted in an intermediate frequency induction furnace with a 150kg basic furnace lining, and each furnace smelts 125kg.

[0060] Melting process: A. Open the intermediate frequency melting furnace and debug it, add 125kg of high-purity iron to melt it; after the high-purity iron is dissolved, add appropriate fluorite to remove slag twice.

[0061] B. After the slag removal is completed, add a carburant with a good ratio to the molten iron for carburization. During th...

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Abstract

The invention relates to a low-alloy ultrahigh-strength steel casting and a production method thereof. According to the low-alloy cast steel, matching of low carbon and various alloy elements is adopted, the high trace niobium element is added, grains are refined, and the structure is homogenized; and after heat treatment, the hardness and abrasion resistance of the low-alloy cast steel are greatly improved, meanwhile, the strength and the tenacity of the low-alloy cast steel are reasonably integrated, and the low-alloy cast steel has good comprehensive mechanical performance and process performance. According to the following mechanical performance of the low-carbon alloy cast steel, the tensile strength ranges from 1,300 Mpa to 1,500 Mpa, the yield strength ranges from 900 MPa to 1,200 MPa, the elongation is larger than or equal to 10%, the ballistic work Ak of the room-temperature V-shaped notch charpy pendulum bob impact test is larger than or equal to 40 J, and the brinell hardness is 390-460 HBW.

Description

technical field [0001] The invention relates to the technical field of metal smelting, in particular to a production method of low-alloy ultra-high-strength steel and castings thereof. Background technique [0002] With the rapid development of industry, construction machinery is developing in the direction of high-end cutting-edge, which puts forward higher requirements on the performance of materials. Low-alloy cast steel has the characteristics of low alloy content (total alloy elements ≤ 5%), wide sources, good comprehensive mechanical properties, simple manufacturing process, and low cost. It is an engineering material with good application prospects. Ultra-high-strength low-alloy cast steel not only has high strength and high hardness, but also has good toughness and impact resistance. Patent CN20141024122.4 discloses a method of preparing low-alloy high-strength cast steel by using an electric arc furnace. The electric arc furnace has strong melting, oxidation and re...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/18C22C38/08C22C38/12C22C38/14C22C38/06C22C38/16C22C33/06C21D1/25
CPCC21D1/18C21D1/25C21D1/28C22C33/06C22C38/002C22C38/02C22C38/04C22C38/06C22C38/08C22C38/12C22C38/14C22C38/16C22C38/18C22C38/42C22C38/44C22C38/46C22C38/48C22C38/50
Inventor 陈赞
Owner JIANGSU DINGTAI ENG MATERIAL
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