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Medium-carbon low-alloy martensitic steel and smelting method thereof

A technology of martensitic steel and smelting method, applied in the field of iron and steel metallurgical materials, can solve the problems of difficult source, complicated preparation process and high cost of raw materials

Inactive Publication Date: 2017-05-24
孙仁
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage is that the preparation process is too complicated, the cost of raw materials is high and the source is not easy

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Carbon C: 0.30%, Silicon Si: 0.30%, Copper Cu: 0.15%, Magnesium Mg: 0.45%, Manganese Mn: 0.230%, Chromium Cr: 0.80%, Nickel Ni: 0.55%, Titanium Ti: 0.04%, Phosphorus P : 0.02%, sulfur S: 0.025%, silicon Si: 0.40%.

[0020] Step 1: Oxygen steelmaking is carried out on the molten steel by using a converter, so that the carbon element content in the steel is lower than 0.4%, the nitrogen element content is lower than 0.2%, and the purity of the molten steel is improved.

[0021] Step 2: Put the molten steel into a refining furnace for refining, adjust the composition of the molten steel in the refining furnace according to the medium-carbon low-alloy martensitic steel and its mass percentage, add aluminum to deoxidize and fix nitrogen to form ALN , produce grains of refined steel, and further remove impurities in molten steel.

[0022] Step 3: After refining, put the molten steel into the continuous casting machine to cool and solidify into a billet. By increasing the cas...

Embodiment 2

[0025] Carbon C: 0.32%, Silicon Si: 0.35%, Copper Cu: 0.20%, Magnesium Mg: 0.45%, Manganese Mn: 0.250%, Chromium Cr: 0.60%, Nickel Ni: 0.55%, Titanium Ti: 0.06%, Phosphorus P : 0.02%, sulfur S: 0.015%, silicon Si: 0.40%.

[0026] Step 1: Oxygen steelmaking is carried out on the molten steel by using a converter, so that the carbon element content in the steel is lower than 0.3%, the nitrogen element content is lower than 0.15%, and the purity of the molten steel is improved.

[0027] Step 2: Put the molten steel into a refining furnace for refining, adjust the composition of the molten steel in the refining furnace according to the medium-carbon low-alloy martensitic steel and its mass percentage, add aluminum to deoxidize and fix nitrogen to form ALN , produce grains of refined steel, and further remove impurities in molten steel.

[0028] Step 3: After refining, put the molten steel into the continuous casting machine to cool and solidify into a billet. By increasing the ca...

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Abstract

The invention discloses medium-carbon low-alloy martensitic steel and a smelting method thereof. The medium-carbon low-alloy martensitic steel comprises, by mass, 0.25%-0.40% of C, 0.20%-0.40% of Si, 0.15%-0.20% of Cu, 0.45%-0.55% of Mg, 0.20%-0.60% of Mn, 0.60%-0.80% of Cr, 0.40%-0.80% of Ni, 0.04%-0.06% of Ti, 0-0.025% of P, 0-0.025% of S, 0.33%-0.53% of Si, and the balance impurities with the allowed quantity being 0.06% or below. The medium-carbon low-alloy martensitic steel disclosed by the invention has the characteristics that hardness and low plasticity are good, a cold plastic deformation forming process can be adopted conveniently, the weldability is good and the heat treatment decarburizing tendency is small and further has the advantages of being capable of obtaining a source conveniently, low in cost and the like.

Description

technical field [0001] The invention belongs to the technical field of iron and steel metallurgy materials, and relates to a medium-carbon low-alloy martensitic steel and a smelting method thereof. Background technique [0002] Medium-carbon low-alloy steel refers to martensitic steel that is strengthened by adding a small amount of alloy after quenching and low-temperature tempering to obtain a medium-carbon martensitic structure, also known as medium-carbon low-alloy martensitic steel. The medium carbon steel commonly used in engineering generally refers to steel with a carbon content between 0.25 and 0.40%. Because the medium-carbon low-alloy martensitic steel has lower hardness and better plasticity than ordinary medium-carbon steel, it is easy to adopt cold plastic deformation forming process, and has the characteristics of good weldability and small heat treatment decarburization tendency, etc. The source is convenient and the price is low. Low cost and other advantag...

Claims

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Application Information

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IPC IPC(8): C22C38/50C22C33/04C21D8/00
Inventor 孙仁
Owner 孙仁
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