High-boron cast steel containing granular boride and preparing method thereof

A boride and granular technology, which is applied in the field of high boron cast steel, high boron cast steel containing granular boride and its preparation, can solve the problems of poor safety and reliability, high brittleness, low toughness, etc., and achieve production cost Low, high hardness and strength, simple production process

Inactive Publication Date: 2007-08-15
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since borides do not become granular, but are only distributed in large blocks, the brittleness is relatively high, and the toughness is not very high, only 12.5J, which leads to poor safety and reliability when the material is used under heavy load and impact wear conditions.

Method used

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  • High-boron cast steel containing granular boride and preparing method thereof

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Effect test

Embodiment 1

[0035] The high-boron cast steel containing granular boride of the present invention is smelted with 500 kilograms of acid medium-frequency induction furnaces, and its manufacturing process steps are:

[0036] ①Heating and melting ordinary steel scrap, pig iron and ferrochrome, adding ferrosilicon and ferromanganese after the molten steel is melted, and adding ferroboron and ferrotitanium before being released from the furnace;

[0037] ② After adjusting the composition in front of the furnace, raise the temperature to 1620°C, add silicon-calcium alloy for pre-deoxidation, then use aluminum for final deoxidation and micro-alloying, and then leave the furnace;

[0038] ③Crush the cerium-based rare earth and nitrogen-containing substances into small pieces with a particle size of less than 12mm. After drying at a temperature below 200°C, place them at the bottom of the ladle, and use the method of pouring into the ladle to perform composite modification of molten steel;

[0039]...

Embodiment 2

[0048] The high-boron cast steel containing granular borides of the present invention is smelted in an alkaline medium-frequency induction furnace with 1000 kilograms, and its manufacturing process steps are:

[0049] ①Heating and melting ordinary steel scrap, pig iron and ferrochrome, adding ferrosilicon and ferromanganese after the molten steel is melted, and adding ferroboron and ferrotitanium before being released from the furnace;

[0050] ② After adjusting the ingredients in front of the furnace, raise the temperature to 1593°C, add silicon-calcium alloy for pre-deoxidation, then use aluminum for final deoxidation and microalloying, and then leave the furnace;

[0051] ③Crush the cerium-based rare earth and nitrogen-containing substances into small pieces with a particle size of less than 12mm. After drying at a temperature below 200°C, place them at the bottom of the ladle, and use the method of pouring into the ladle to perform composite modification of molten steel;

...

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Abstract

The invention discloses a preparing method of granular boride high-boron cast steel, which comprises the following steps: allocating 0.15%-0.45% C,0.75%-2.70% B, 0.34 %-1.50% Ti, 0.80%-1.20% Cr, 0.50%-1.50% Si, 0.50%-1.50% Mn, 0.04%-0.12% Ce, 0.08%-0.20% Al, 0.03%-0.10% Ca, 0.01%-0.06 N, P<0.05%, S<0.05% and Fe; setting B / C=5.0-6.0, B / Ti=1.8-2.2; adopting electric stove to melt; mixing common scrap steel, pig iron and chromium iron; heating to melt; adding into silicon iron and manganese iron; adding into ferroboron and ferrotitanium before tapping; adjusting furnace-front element to be quality; heating-up; adding into silicon-calcium alloy; pre-deoxidizing; end-deoxidizing with aluminum; micro-alloying; proceeding composite deteriorating process outside of the furnace with cerium and nitrogen; keeping the temperature; proceeding oil-cooling quenching; tempering under the low temperature; getting the product. This invention possesses merits of high hardness and strength and good tenacity and resistance, which can increase the durability of wear resisting part.

Description

technical field [0001] The invention belongs to the technical field of wear-resistant metal materials, and relates to a high-boron cast steel, in particular to a high-boron cast steel containing granular borides and a preparation method thereof. Background technique [0002] Abrasion is common in many industrial sectors such as metallurgy, mining, machinery, electric power, coal, petroleum, transportation, military industry, etc. and has become an important cause of equipment failure or material damage, and is also one of the problems that cause the most economic losses. The development of new anti-wear Materials, reducing metal wear, are of great significance to the national economy. At present, the widely used anti-wear materials mainly include alloy steel and white cast iron. The former has good toughness, but has the disadvantages of low hardness and poor wear resistance. The latter has high hardness and high wear resistance, but is brittle and easy to use. Insufficient...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/32C22C33/04C21C7/00B22D27/04C21D1/18C21D11/00
Inventor 符寒光邢建东高义民皇志富
Owner XI AN JIAOTONG UNIV
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