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Vanadium-titanium-containing ductile cast iron material and thermal treatment process

A technology of nodular iron, vanadium and titanium, applied in the field of casting processing, to achieve the effect of reducing the austenitization temperature, eliminating potential safety hazards, and uniform as-cast structure

Active Publication Date: 2016-06-29
CHENGDE RONGMAO CAST STEEL +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In view of the above-mentioned deficiencies, the purpose of the present invention is to provide a new type of ductile iron material and heat treatment process, aiming to solve the problem of eliminating austempering and obtaining the desired microstructure, which not only eliminates potential safety hazards but also saves energy and protects the environment.

Method used

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  • Vanadium-titanium-containing ductile cast iron material and thermal treatment process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] A vanadium-containing titanium ductile iron material, by mass percentage, includes the following components: C3.20%, Si2.30%, Mn0.96%, Cr0.20%, Cu0.60%, Mo0.80%, V0 .54%, Ti0.3%, Nb0.01%, Mg0.03%, rare earth element 0.02%, and the rest is Fe.

[0036] The production state of the vanadium-containing titanium ductile iron material is a process of quenching and low-temperature tempering, which includes the following steps:

[0037] 1) According to the above ratio, castings are made by smelting molten iron, spheroidizing, and casting;

[0038] 2) Austenitize the casting for heat preservation, the specific operation is: heat the casting obtained in step 1) at a temperature of 830°C, and the heat preservation time is calculated as D×2min / mm, where D is the maximum thickness of the casting, and the unit is mm;

[0039] 3) cooling the austenitized and heat-preserved casting in step 2) in a quenching medium, the quenching medium is an aqueous NaCl solution with a mass concentr...

Embodiment 2

[0042] A vanadium-containing titanium ductile iron material, by mass percentage, includes the following components:

[0043] C3.90%, Si2.93%, Mn2.80%, Cr0.90%, Cu0.90%, Mo1.20%, V0.68%, Ti0.78%, Nb0.09%, P0.045%, S0.028%, Mg0.05%, rare earth element 0.03%, and the rest is Fe.

[0044] The process is as follows:

[0045] 1) According to the above ratio, the casting is made by melting molten iron, spheroidizing, and casting.

[0046]2) Austenitize the casting for heat preservation, the specific operation is: heat the casting obtained in step 1) at a temperature of 880°C, and the heat preservation time is calculated as D×2min / mm, where D is the maximum thickness of the casting, and the unit is mm.

[0047] 3) cooling the casting of step 2) austenitized heat preservation in a quenching medium, the quenching medium is an aqueous NaCl solution with a mass concentration of 10%, and the cooling time is calculated by D×sec / 3mm, wherein D is the maximum Thickness dimension, the unit...

Embodiment 3

[0050] A vanadium-containing titanium ductile iron material, by mass percentage, includes the following components:

[0051] C3.60%, Si2.5%, Mn1.56%, Cr0.50%, Cu0.70%, Mo1.00%, V0.60%, Ti0.50%, Nb0.05%, P0.02%, S0.01%, Mg0.04%, rare earth element 0.025%, and the rest is Fe.

[0052] The process is as follows:

[0053] 1) According to the above ratio, castings are made by smelting molten iron, spheroidizing, and casting;

[0054] 2) Austenitize the casting for heat preservation, the specific operation is: heat the casting obtained in step 1) at a temperature of 850°C, and the heat preservation time is calculated as D×2min / mm, where D is the maximum thickness of the casting, and the unit is mm;

[0055] 3) Cool the castings austenitized and kept in step 2) in a quenching medium, the quenching medium is an aqueous NaCl solution with a mass concentration of 12%, and the cooling time is calculated by D×sec / 3mm, where D is the maximum Thickness dimension, the unit is mm; sec is ...

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Abstract

The invention relates to a vanadium-titanium-containing ductile cast iron material. The material comprises, by mass, 3.20%-3.90% of carbon, 2.30%-2.93% of silicon, 0.96%-2.80% of manganese, 0.20%-0.90% of chromium, 0.60%-0.90% of copper, 0.80%-1.20% of molybdenum, 0.54%-0.68% of vanadium, 0.3%-0.78% of titanium, 0.01%-0.09% of niobium, higher than or equal to 0 but lower than 0.05% of phosphorus, higher than or equal to 0 but lower than 0.03% of sulfur, 0.03%-0.05% of magnesium, 0.02%-0.03% of rare earth elements, and the balance iron. According to the material, the ingredients are properly proportioned, and the material has the advantages that grains are refined, hardness is increased, hardenability is enhanced, the Ms point is moved downwards, and lower-bainite ferrite can be formed more easily.

Description

technical field [0001] The invention relates to the field of casting processing, in particular to a vanadium-titanium ductile iron and a heat treatment process. Background technique [0002] At present, conventional nodular cast iron is used for machine bed, mechanical crankshaft and wear-resistant materials, etc., and different heat treatment processes are adopted respectively. Ductile cast iron (hereinafter referred to as ductile iron) as a wear-resistant material is generally austenitized and then austenitized and quenched, so that the material can finally obtain a multiphase structure of lower bainite ferrite, retained austenite and spherical graphite, so that the material has The hardness and toughness are well coordinated, and it has a strong work hardening ability. It is a kind of impact-resistant and wear-resistant material. Isothermal quenching is generally carried out in a salt bath, and the salt is generally composed of sodium nitrite and potassium nitrate, which...

Claims

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Application Information

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IPC IPC(8): C22C37/10C22C37/06C22C37/04C21D5/00C21D1/18C21D1/60
CPCC21D1/18C21D5/00C21D2211/001C21D2211/005C21D2211/006C22C37/04C22C37/06C22C37/10
Inventor 王景荣姜延飞王景利王景会王荣伟凌海军
Owner CHENGDE RONGMAO CAST STEEL
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