CN110453050A - There is the experimental method of free ferrite reason in a kind of determining salt furnace treatment reason - Google Patents
There is the experimental method of free ferrite reason in a kind of determining salt furnace treatment reason Download PDFInfo
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- CN110453050A CN110453050A CN201910807679.8A CN201910807679A CN110453050A CN 110453050 A CN110453050 A CN 110453050A CN 201910807679 A CN201910807679 A CN 201910807679A CN 110453050 A CN110453050 A CN 110453050A
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- quenching
- salt
- reason
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- free ferrite
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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
- C21D1/56—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering characterised by the quenching agents
- C21D1/58—Oils
-
- 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
- C21D1/56—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering characterised by the quenching agents
- C21D1/60—Aqueous agents
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
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- Mechanical Engineering (AREA)
- Crystallography & Structural Chemistry (AREA)
- Thermal Sciences (AREA)
- Health & Medical Sciences (AREA)
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- Life Sciences & Earth Sciences (AREA)
- General Physics & Mathematics (AREA)
- General Health & Medical Sciences (AREA)
- Biochemistry (AREA)
- Pathology (AREA)
- Analytical Chemistry (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Heat Treatment Of Articles (AREA)
- Control Of Heat Treatment Processes (AREA)
- Investigating And Analyzing Materials By Characteristic Methods (AREA)
- Heat Treatments In General, Especially Conveying And Cooling (AREA)
Abstract
There is the experimental method of free ferrite reason in a kind of determining salt furnace treatment reason, it is related to technical field of heat treatment technology, specifically includes the following steps: quenching oil is placed on quenching rack top, it is set as 300mm to the distance between experimental products and quenching oil at rear air lock discharge door；Quenching salt is stored in the quenching tank on quenching rack top；Quenching oil being manually transferred into respectively after the discharging of air lock immediately after after experimental products, in quenching salt, setting the temperature and soaking time in quenching and preserving heat area, protective atmosphere is equal are as follows: nitrogen+propane+methanol, carbon-potential control are 0.75 ± 0.5%c；Quenching oil is the dedicated bright isothermal quenching oil of bearing；Quenching salt is the water of salt (sodium nitrite and potassium nitrate of 1:1)+0.5%；It whether there is free ferrite after experimental products are by the quenching of normal quenching program and through microscope detection；Present invention determine that the basic reason that the free ferrite tissue that salt furnace product occurs generates is to contain water in quenching salt.
Description
Technical field
The present invention relates to technical field of heat treatment technology, more particularly, to there is free iron in a kind of determining salt furnace treatment reason
The experimental method of ferritic reason.
Background technique
Well known, free ferrite refers to that those are free on self-existent ferrite except other tissues；With formation item
Part is different, and pro-eutectoid ferrite has a different shape, such as isometric shape, along crystalline form, spindle, zigzag and needle-shaped.Ferrite
Or the matrix of pearlitic structrure.In the hot rolling (normalizing) of carbon steel and low alloy steel and annealed structure, ferrite is main group
Cheng Xiang；Ferritic ingredient and tissue have a major impact the processing performance of steel, in some cases to the service performance of steel
There is shadow；Easily there is free ferrite in the product processed on club furnace salt hardening production line, depth often in 0.005mm or so,
Good improvement is not had yet to the adjustment of technological parameter, in order to meet customer need, finds out what free ferrite generated
Basic reason becomes the basic demand of those skilled in the art.
Summary of the invention
In order to overcome the shortcomings in the background art, the invention discloses free iron element occur in a kind of determining salt furnace treatment reason
The experimental method of body reason.
In order to realize the goal of the invention, the present invention adopts the following technical scheme:
There is the experimental method of free ferrite reason in a kind of determining salt furnace treatment reason, specifically includes the following steps:
(1), prepare hardening media quenching oil and quenching salt；
Quenching oil is placed on quenching rack top, at rear air lock discharge door between experimental products and quenching oil
Distance is set as 300mm；Quenching salt is stored in the quenching tank on quenching rack top；
(2), quenching oil will be manually transferred into respectively after the discharging of air lock immediately after, in quenching salt after experimental products, if
The temperature for determining quenching and preserving heat area is 845 ± 5 DEG C, and soaking time is 65 ± 5 minutes, and protective atmosphere is equal are as follows: and nitrogen+propane+
Methanol, carbon-potential control are 0.75 ± 0.5%c；
Quenching oil is the dedicated bright isothermal quenching oil of bearing；Quenching salt be salt (sodium nitrite and potassium nitrate of 1:1)+
0.5% water；
(3), it whether there is free ferrite after experimental products are by the quenching of normal quenching program and through microscope detection.
Occurs the experimental method of free ferrite reason in the determination salt furnace treatment reason, the intake of nitrogen is 20 vertical
Square rice is per hour；The intake of methanol are as follows: 2 liter per hour；Propane is by solenoid valve control, and auto switching, Liang≤600 liter Tong Ru are often
Hour.
There is the experimental method of free ferrite reason in the determination salt furnace treatment reason, is multiple phases to experimental products
With the bearing products of model.
By adopting the above-described technical solution, the invention has the following beneficial effects:
There is the experimental method of free ferrite reason in determining salt furnace treatment reason of the present invention, by using difference
Hardening media is quenched respectively using quenching oil and quenching salt, and comparative test result is obtained using the product of quenching oil without trip
From ferrite, there is free ferrite using the product of quenching salt.
Specific embodiment
By the following examples can the detailed explanation present invention, the open purpose of the present invention is intended to protect model of the present invention
Enclose all interior technological improvements.
There is the experimental method of free ferrite reason in determining salt furnace treatment reason of the present invention, specifically includes following
Step:
(1), prepare hardening media quenching oil and quenching salt；
Quenching oil is placed on quenching rack top, at rear air lock discharge door between experimental products and quenching oil
Distance is set as 300mm；Quenching salt is stored in the quenching tank on quenching rack top；
(2), quenching oil will be manually transferred into respectively after the discharging of air lock immediately after, in quenching salt after experimental products, if
The temperature for determining quenching and preserving heat area is 845 ± 5 DEG C, and soaking time is 65 ± 5 minutes, and protective atmosphere is equal are as follows: and nitrogen+propane+
Methanol, carbon-potential control are 0.75 ± 0.5%c；
Quenching oil is the dedicated bright isothermal quenching oil of bearing；Quenching salt be salt (sodium nitrite and potassium nitrate of 1:1)+
Water, the ratio of water are the 0.5% of salt total weight；
(3), it whether there is free ferrite after experimental products are by the quenching of normal quenching program and through microscope detection.
Occurs the experimental method of free ferrite reason in the determination salt furnace treatment reason, the intake of nitrogen is 20 vertical
Square rice is per hour；The intake of methanol are as follows: 2 liter per hour；Propane is by solenoid valve control, and auto switching, Liang≤600 liter Tong Ru are often
Hour.
There is the experimental method of free ferrite reason in the determination salt furnace treatment reason, is multiple phases to experimental products
With the bearing products of model.
Embodiment
Experiment is compared using experimental program A and experimental program B:
After implementing experimental program, testing result are as follows: it is quenched using quenching oil medium, model 6226-2RS/01's
Four identical bearings of four identical bearings and model NU314/01, are detected under the microscope without free ferrite；Using
Ingredient is that the non-medium of quenching salt of (sodium nitrite and potassium nitrate of 1:1)+0.5% water is quenched, and detection has under the microscope
Free ferrite generates, and ferrite is caused by aoxidize in quenching process as product, and oxygen required for aoxidizing is to quench
Caused by water in salt, accordingly, it is determined that the basic reason that the free ferrite tissue that salt furnace product occurs generates is in quenching salt
Contain water.
Part not in the detailed description of the invention is the prior art.
The embodiment selected herein to disclose goal of the invention of the invention, is presently considered to be suitable, still,
It is to be understood that the present invention is intended to include all changes and improvement that all belong to the embodiment in this design and invention scope.
Claims (3)
1. there is the experimental method of free ferrite reason in a kind of determining salt furnace treatment reason, it is characterized in that: specifically including following
Step:
(1), prepare hardening media quenching oil and quenching salt；
Quenching oil is placed on quenching rack top, at rear air lock discharge door to the distance between experimental products and quenching oil
It is set as 300mm；Quenching salt is stored in the quenching tank on quenching rack top；
(2), quenching oil will be manually transferred into respectively after the discharging of air lock immediately after, in quenching salt after experimental products, setting is quenched
The temperature of fiery heat preservation zone is 845 ± 5 DEG C, and soaking time is 65 ± 5 minutes, and protective atmosphere is equal are as follows: nitrogen+propane+methanol,
Carbon-potential control is 0.75 ± 0.5 %c；
Quenching oil is the dedicated bright isothermal quenching oil of bearing；Quenching salt is salt (sodium nitrite and potassium nitrate of 1:1)+water,
The weight of water is the 0.5% of salt weight；
(3), it whether there is free ferrite after experimental products are by the quenching of normal quenching program and through microscope detection.
2. there is the experimental method of free ferrite reason, feature in determining salt furnace treatment reason according to claim 1
Be: the intake of nitrogen be 20 cubic metres per hour；The intake of methanol are as follows: 2 liter per hour；Propane is by solenoid valve control, certainly
Dynamic on-off, Liang≤600 liter per hour Tong Ru.
3. there is the experimental method of free ferrite reason, feature in determining salt furnace treatment reason according to claim 1
It is: is the bearing products of multiple same models to experimental products.
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Citations (8)
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|---|---|---|---|---|
| JPS5333937A (en) * | 1976-09-10 | 1978-03-30 | Hitachi Ltd | Surface hardened stainless steel and production method thereof |
| JPS62182221A (en) * | 1986-02-07 | 1987-08-10 | Kobe Steel Ltd | Production of high-strength steel plate having excellent hydrogen sulfide resistance and toughness |
| EP0624658A1 (en) * | 1993-05-13 | 1994-11-17 | Sumitomo Chemical Company, Limited | Steel wire for making high strength steel wire product and method for manufacturing thereof |
| CN101760602A (en) * | 2009-12-25 | 2010-06-30 | 重庆齿轮箱有限责任公司 | Large-scale thin wall gear ring quenching deformation control method |
| CN102181614A (en) * | 2011-04-08 | 2011-09-14 | 常州克劳诺斯特种轴承制造有限公司 | Quenching process for heat treatment color finished products |
| CN103111472A (en) * | 2013-01-24 | 2013-05-22 | 首钢总公司 | Method for controlling free ferrite content of tire cord steel |
| CN104762449A (en) * | 2015-03-25 | 2015-07-08 | 湖北三环离合器有限公司 | Thermal treatment technology for clutch disc hub |
| CN109722505A (en) * | 2018-12-27 | 2019-05-07 | 浙江辛子精工机械股份有限公司 | Middle low carbon steel automobile clutch parts machining method and its equipment |
-
2019
- 2019-08-29 CN CN201910807679.8A patent/CN110453050B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5333937A (en) * | 1976-09-10 | 1978-03-30 | Hitachi Ltd | Surface hardened stainless steel and production method thereof |
| JPS62182221A (en) * | 1986-02-07 | 1987-08-10 | Kobe Steel Ltd | Production of high-strength steel plate having excellent hydrogen sulfide resistance and toughness |
| EP0624658A1 (en) * | 1993-05-13 | 1994-11-17 | Sumitomo Chemical Company, Limited | Steel wire for making high strength steel wire product and method for manufacturing thereof |
| CN101760602A (en) * | 2009-12-25 | 2010-06-30 | 重庆齿轮箱有限责任公司 | Large-scale thin wall gear ring quenching deformation control method |
| CN102181614A (en) * | 2011-04-08 | 2011-09-14 | 常州克劳诺斯特种轴承制造有限公司 | Quenching process for heat treatment color finished products |
| CN103111472A (en) * | 2013-01-24 | 2013-05-22 | 首钢总公司 | Method for controlling free ferrite content of tire cord steel |
| CN104762449A (en) * | 2015-03-25 | 2015-07-08 | 湖北三环离合器有限公司 | Thermal treatment technology for clutch disc hub |
| CN109722505A (en) * | 2018-12-27 | 2019-05-07 | 浙江辛子精工机械股份有限公司 | Middle low carbon steel automobile clutch parts machining method and its equipment |
Non-Patent Citations (2)
| Title |
|---|
| "线材轧后控制冷却 ", 《上海金属》 * |
| 顾晓明 等: ""大模数重载人字齿轮轴硝盐淬火工艺研究"", 《金属加工(热加工)》 * |
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