Chromium carbonitride strengthening agent and preparation method thereof

A technology of chromium carbonitride and strengthening agent, applied in the field of chromium carbonitride strengthening agent and its preparation, can solve the problems of uniform composition of difficult structure, refined grain structure, difficult to meet requirements, etc., and achieve high comprehensive mechanical properties, The effect of uniform organizational structure and low price

Active Publication Date: 2020-01-07
成都锦钛精工科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the nitrogen content of ferromanganese nitride alloy is 4-6wt%, and the nitrogen content of ferrochromium nitride alloy is 5-7wt%, it is difficult to meet the requirements for high nitrogen content additives in alloy steel smelting
At the same time, due to the low density of additives such as carbon, the additives float on the upper layer due to the large density difference with molten steel during the steelmaking process, making it difficult to obtain high-strength high-strength steel with uniform composition, refined grain structure, and stable comprehensive performance. Wear-resistant alloy steel

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The steps of this embodiment are as follows:

[0026] (1) Ingredients and molding

[0027] Raw material: Cr 2 O 3 Powder 154g, graphite powder 48g, Fe powder 2g, Si powder 1g and Mn powder 1g. The weighed raw material powders are wet-milled and mixed with a ball mill, using tungsten carbide as the grinding ball and alcohol as the ball milling medium. The quality of the ball: Material quality: the quality of alcohol = 8:1:1.6, the speed of ball milling is 40r / min, the raw material powder is mixed uniformly by ball milling, the mixture is separated and the alcohol is volatilized and pressed into a blank of Φ20mmx10mm under a pressure of 50Mpa;

[0028] (2) Sintering

[0029] Put the billet prepared in step (1) into a reaction furnace and heat it at a heating rate of 5°C / min. When the temperature in the furnace reaches 680°C, pass high-purity nitrogen (purity 5N) into the furnace and keep it at this temperature for 1 hour After the holding time is reached, the furnace temperature...

Embodiment 2

[0032] The steps of this embodiment are as follows:

[0033] (1) Ingredients and molding

[0034] Raw materials: CrO powder 68g, CrO 2 Powder 84g, activated carbon powder 48g, Fe 2 O 3 Powder 6g and Si powder 4g, the measured raw material powders are mixed with a ball mill by wet ball milling, using tungsten carbide as the grinding ball, alcohol as the ball milling medium, the quality of the ball: the quality of the material: the quality of the alcohol = 8:1: 1.6, the speed of ball milling is 40r / min, the raw material powder is mixed uniformly by ball milling, the mixture is separated and the alcohol is volatilized and pressed into a blank of Φ20mmx10mm under a pressure of 50Mpa;

[0035] (2) Sintering

[0036] Put the billet prepared in step (1) into a reaction furnace and heat it at a temperature increase rate of 10°C / min. When the temperature in the furnace reaches 650°C, pass high-purity nitrogen (purity 5N) into the furnace and keep it at this temperature for 1.5 h. After the ho...

Embodiment 3

[0039] The steps of this embodiment are as follows:

[0040] (1) Ingredients and molding

[0041] Raw material: CrO 3 Powder 200g, charcoal powder 86g, Fe powder 4g, Co powder 2g and Mn powder 3g. The measured raw material powders are wet-milled and mixed with a ball mill, using tungsten carbide as the grinding ball and alcohol as the ball milling medium. The quality of the ball: Material quality: the quality of alcohol = 8:1:1.6, the speed of ball milling is 40r / min, the raw material powder is mixed uniformly by ball milling, the mixture is separated and the alcohol is volatilized and pressed into a blank of Φ20mmx10mm under a pressure of 50Mpa;

[0042] (2) Sintering

[0043] Put the billet prepared in step (1) into a reaction furnace and heat it at a heating rate of 7°C / min. When the temperature in the furnace reaches 670°C, pass high-purity nitrogen (purity 5N) into the furnace and keep it at this temperature for 1.2 h. After the holding time is reached, the furnace temperature i...

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Abstract

The invention provides a chromium carbonitride reinforcer and a preparation method thereof. The chemical components of the chromium carbonitride reinforcer include 70-75 wt% of Cr, 15-20 wt% of N, 3-9wt% of C, 0.5-4 wt% of L1, 0.3-4 wt% of L2 and 0.2-1.2 wt% of O, wherein the apparent density is 3800-4350 kg / m<3>, L1 includes at least one of Fe, Co and Ni, and L2 includes Si or / and Mn. The preparation method comprises the following steps that (1) burdening and forming are performed; and (2) sintering is performed, specifically, billets prepared in the step (1) are placed into a reaction furnace and heated, nitrogen or ammonia gas is introduced into the furnace and heat preservation is performed for 1-1.5 h when the furnace internal temperature reaches 650-680 DEG C, the furnace internaltemperature is raised to 950-1500 DEG C and reaction is performed for 1-4 h after the heat preservation time is ended, then the billets are subjected to furnace cooling under the protection of the nitrogen or ammonia gas atmosphere and taken out of the furnace after the temperatures reach 120 DEG C or below, and the chromium carbonitride reinforcer is obtained.

Description

Technical field [0001] The invention belongs to the field of alloying strengthening additives used in steelmaking, and relates to a chromium carbonitride strengthening agent and a preparation method thereof. Background technique [0002] When preparing high-strength and wear-resistant alloy steel, the appropriate addition of carbon, nitrogen, chromium and other alloying elements can improve the comprehensive mechanical properties of the steel such as wear resistance, corrosion resistance, hardness, toughness, and ductility. In particular, the increase in nitrogen content in steel can cause some of the alloy elements in a solid solution state to precipitate in the form of nitrides, and at the same time can refine the grains, which can achieve the dual strengthening effects of precipitation strengthening and fine grain strengthening. [0003] In the prior art, ferromanganese nitride and ferrochrome nitride are generally used as nitrogen-increasing additives, and at the same time, it ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C35/00
CPCC22C35/00
Inventor 王怡伟陈一可
Owner 成都锦钛精工科技有限公司
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