CN112760458A - Method for eliminating mixed crystal structure of medium-carbon microalloyed steel - Google Patents
Method for eliminating mixed crystal structure of medium-carbon microalloyed steel Download PDFInfo
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- CN112760458A CN112760458A CN202011374050.8A CN202011374050A CN112760458A CN 112760458 A CN112760458 A CN 112760458A CN 202011374050 A CN202011374050 A CN 202011374050A CN 112760458 A CN112760458 A CN 112760458A
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
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- Organic Chemistry (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
The invention relates to the technical field of medium carbon microalloyed steel heat treatment, and discloses a method for eliminating a mixed crystal structure of medium carbon microalloyed steel, which comprises the following steps: firstly, preheating a heating furnace by workers, and then putting the medium carbon micro-alloy steel needing to eliminate mixed crystals into the heating furnace; the temperature in the heating furnace is slowly increased by workers, when the temperature in the heating furnace is increased to 500-700 ℃, the heating of the heating furnace is suspended, and after the heating furnace is kept warm for a period of time, the heating furnace is continuously heated; when the temperature of the heating furnace rises to 900-1000 ℃, stopping heating the heating furnace, and preserving the heat of the heating furnace for a period of time again; the method can rapidly eliminate the mixed crystal structure in the medium carbon microalloyed steel and improve the removal effect of the mixed crystal structure.
Description
Technical Field
The invention relates to the technical field of medium carbon microalloyed steel heat treatment, in particular to a method for eliminating a mixed crystal structure of medium carbon microalloyed steel.
Background
The mixed crystal is a phenomenon that serious crystal grains are not uniform in the material, is a defect of the material, and is represented by microscopic observation that the crystal grains on a metal matrix are not uniform in size, and coarse crystals and fine crystals are mixed, so that the mixed crystal causes the non-uniform performance of the material and causes the reduction of comprehensive mechanical properties, and particularly reduces the low-temperature impact toughness of the material. The reasons for the generation of mixed crystals are mainly tissue inheritance, segregation of components, multiple-fire forging, high final forging temperature and the like,
the mechanical properties of steel can be greatly improved through heat treatment of the steel, the mechanical properties such as hardness, strength, toughness, wear resistance and the like of the steel can be changed through the heat treatment, but the heat treatment of the steel can bring negative effects, mixed crystals are the most typical structure, and the method commonly used for eliminating the mixed crystals in medium carbon alloy steel is to eliminate the mixed crystals by adopting multiple normalizing, but the mixed crystals in the existing alloy steel are still not eliminated after the multiple normalizing.
Disclosure of Invention
Aiming at the defects of the existing method for eliminating the mixed crystal structure of the medium-carbon microalloyed steel, the invention provides the method for eliminating the mixed crystal structure of the medium-carbon microalloyed steel, which has the advantages of reducing normalizing times, improving the removal efficiency of mixed crystals and the like and solves the problems in the background art.
The invention provides the following technical scheme: a method for eliminating a mixed crystal structure of medium-carbon microalloyed steel comprises the following steps:
the first step is as follows: preheating a heating furnace by workers, and putting the medium carbon microalloyed steel needing to eliminate mixed crystals into the heating furnace;
the second step is that: the temperature in the heating furnace is slowly increased by workers, when the temperature in the heating furnace is increased to 500-700 ℃, the heating of the heating furnace is suspended, and after the heating furnace is kept warm for a period of time, the heating furnace is continuously heated;
the third step: when the temperature of the heating furnace rises to 900-1000 ℃, stopping heating the heating furnace, and preserving the heat of the heating furnace for a period of time again;
the fourth step: the working personnel take out the heated medium carbon micro-alloy steel from the heating furnace, put the discharged medium carbon micro-alloy steel into water for quenching, put the quenched medium carbon micro-alloy steel into the heating furnace again for heating, and quench the medium carbon micro-alloy steel again after repeating the steps;
the fifth step: and (4) cooling the quenched medium carbon microalloyed steel to room temperature by workers.
Preferably, the preheating temperature in the heating furnace in the first step is 200 to 300 degrees.
Preferably, the holding time of the heating furnace in both the second step and the third step is 1 hour to 2 hours.
Preferably, the temperature of the water in the fourth step is 30 to 40 ℃, and the residence time of the medium carbon steel alloy in the water is generally 2 to 2.5 minutes.
Preferably, the quenching time in the fourth step is generally 10 minutes.
Preferably, the surface temperature of the quenched medium carbon micro-alloy steel is 300 to 400 ℃, the quenched medium carbon micro-alloy steel is cooled to 200 to 300 ℃ in air and then placed in a heating furnace for heating, and the air cooling time is 7 to 8 minutes.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
A method for eliminating a mixed crystal structure of medium-carbon microalloyed steel comprises the following steps:
the first step is as follows: preheating a heating furnace by workers, and putting the medium carbon microalloyed steel needing to eliminate mixed crystals into the heating furnace;
the second step is that: the temperature in the heating furnace is slowly increased by workers, when the temperature in the heating furnace is increased to 500-700 ℃, the heating of the heating furnace is suspended, and after the heating furnace is kept warm for a period of time, the heating furnace is continuously heated;
the third step: when the temperature of the heating furnace rises to 900-1000 ℃, stopping heating the heating furnace, and preserving the heat of the heating furnace for a period of time again;
the fourth step: the working personnel take out the heated medium carbon micro-alloy steel from the heating furnace, put the discharged medium carbon micro-alloy steel into water for quenching, put the quenched medium carbon micro-alloy steel into the heating furnace again for heating, and quench the medium carbon micro-alloy steel again after repeating the steps;
the fifth step: and (4) cooling the quenched medium carbon microalloyed steel to room temperature by workers.
Wherein the preheating temperature in the heating furnace in the first step is 200 to 300 ℃.
Wherein the heat preservation time of the heating furnace in the second step and the third step is 1 hour to 2 hours.
Wherein the temperature of the water in the fourth step is 30-40 ℃, and the retention time of the medium carbon steel alloy in the water is generally 2-2.5 minutes.
Wherein the quenching time in the fourth step is generally 10 minutes.
Wherein the surface temperature of the quenched medium carbon micro-alloy steel is 300-400 ℃, the quenched medium carbon micro-alloy steel is cooled to 200-300 ℃ in air and then placed in a heating furnace for heating, and the air cooling time is 7-8 minutes.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. The method for eliminating the mixed crystal structure of the medium-carbon microalloyed steel is characterized by comprising the following steps of:
the first step is as follows: preheating a heating furnace by workers, and putting the medium carbon microalloyed steel needing to eliminate mixed crystals into the heating furnace;
the second step is that: the temperature in the heating furnace is slowly increased by workers, when the temperature in the heating furnace is increased to 500-700 ℃, the heating of the heating furnace is suspended, and after the heating furnace is kept warm for a period of time, the heating furnace is continuously heated;
the third step: when the temperature of the heating furnace rises to 900-1000 ℃, stopping heating the heating furnace, and preserving the heat of the heating furnace for a period of time again;
the fourth step: the working personnel take out the heated medium carbon micro-alloy steel from the heating furnace, put the discharged medium carbon micro-alloy steel into water for quenching, put the quenched medium carbon micro-alloy steel into the heating furnace again for heating, and quench the medium carbon micro-alloy steel again after repeating the steps;
the fifth step: and (4) cooling the quenched medium carbon microalloyed steel to room temperature by workers.
2. The method for eliminating the mixed crystal structure of the medium carbon microalloyed steel according to claim 1, characterized in that: the preheating temperature in the heating furnace in the first step is 200 to 300 degrees.
3. The method for eliminating the mixed crystal structure of the medium carbon microalloyed steel according to claim 1, characterized in that: the holding time of the heating furnace in the second step and the third step is 1 hour to 2 hours.
4. The method for eliminating the mixed crystal structure of the medium carbon microalloyed steel according to claim 1, characterized in that: the temperature of the water in the fourth step is 30-40 ℃, and the retention time of the medium carbon steel alloy in the water is generally 2-2.5 minutes.
5. The method for eliminating the mixed crystal structure of the medium carbon microalloyed steel according to claim 1, characterized in that: the quenching time in the fourth step is generally 10 minutes.
6. The method for eliminating the mixed crystal structure of the medium carbon microalloyed steel according to claim 1, characterized in that: the surface temperature of the quenched medium carbon micro-alloy steel is 300-400 ℃, the quenched medium carbon micro-alloy steel is cooled to 200-300 ℃ in air and then placed into a heating furnace for heating, and the air cooling time is 7-8 minutes.
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| CN202011374050.8A CN112760458A (en) | 2020-11-30 | 2020-11-30 | Method for eliminating mixed crystal structure of medium-carbon microalloyed steel |
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| CN202011374050.8A CN112760458A (en) | 2020-11-30 | 2020-11-30 | Method for eliminating mixed crystal structure of medium-carbon microalloyed steel |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101418368A (en) * | 2008-12-04 | 2009-04-29 | 江苏华久特钢工具有限公司 | Heat treating process for eliminating mixed crystal of low-alloy quick-cutting steel |
| CN102134637A (en) * | 2011-01-18 | 2011-07-27 | 上海交通大学 | Method for refining grains of large medium high alloy steel forgings |
| CN103498032A (en) * | 2013-09-23 | 2014-01-08 | 无锡阳工机械制造有限公司 | Quenching process of medium carbon alloy steel |
| CN104630443A (en) * | 2015-01-22 | 2015-05-20 | 燕山大学 | Large-scale cylindrical shell section heat treatment method |
| CN108823381A (en) * | 2018-07-12 | 2018-11-16 | 河钢股份有限公司 | A kind of heat treatment process improving H13 hot-work die steel forging material structural homogenity |
-
2020
- 2020-11-30 CN CN202011374050.8A patent/CN112760458A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101418368A (en) * | 2008-12-04 | 2009-04-29 | 江苏华久特钢工具有限公司 | Heat treating process for eliminating mixed crystal of low-alloy quick-cutting steel |
| CN102134637A (en) * | 2011-01-18 | 2011-07-27 | 上海交通大学 | Method for refining grains of large medium high alloy steel forgings |
| CN103498032A (en) * | 2013-09-23 | 2014-01-08 | 无锡阳工机械制造有限公司 | Quenching process of medium carbon alloy steel |
| CN104630443A (en) * | 2015-01-22 | 2015-05-20 | 燕山大学 | Large-scale cylindrical shell section heat treatment method |
| CN108823381A (en) * | 2018-07-12 | 2018-11-16 | 河钢股份有限公司 | A kind of heat treatment process improving H13 hot-work die steel forging material structural homogenity |
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Application publication date: 20210507 |