CN109439886A - The control method of small-bore 12Cr1MoVG steel pipe decarburized layer - Google Patents
The control method of small-bore 12Cr1MoVG steel pipe decarburized layer Download PDFInfo
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- CN109439886A CN109439886A CN201811569491.6A CN201811569491A CN109439886A CN 109439886 A CN109439886 A CN 109439886A CN 201811569491 A CN201811569491 A CN 201811569491A CN 109439886 A CN109439886 A CN 109439886A
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- Prior art keywords
- steel pipe
- decarburized layer
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- small
- control method
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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
- C21D11/00—Process control or regulation for heat treatments
-
- 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
-
- 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
- C21D1/26—Methods of annealing
- C21D1/28—Normalising
-
- 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
- C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
-
- 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
- C21D3/00—Diffusion processes for extraction of non-metals; Furnaces therefor
- C21D3/02—Extraction of non-metals
- C21D3/04—Decarburising
-
- 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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/08—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tubular bodies or pipes
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
The present invention relates to a kind of control methods of small-bore 12Cr1MoVG steel pipe decarburized layer.Include following steps: arranging drying process before normalized treatment technique, implements tempering process in carburetting atmosphere.The present invention is by implementing drying process, suitable heat treatment process and the recarburization process in drawing process, the decarburized layer deepness in 12Cr1MoVG Steel Tube Heat Treatment Process can be efficiently controlled, it is set to comply fully with the decarburized layer requirement of new standard GB/T5310-2017, and standard requirements are fully achieved in steel tube performance.
Description
Technical field
The present invention relates to a kind of control methods of small-bore 12Cr1MoVG steel pipe decarburized layer, belong to small-caliber seamless steel pipe
Technical field of heat treatment.
Background technique
The decarbonizing process of steel is the H in furnace gas2O、CO2、O2、H2With in steel Fe, C reaction as a result, its reaction equation such as
Under:
When heated, other than superficial layer can cause to generate oxide skin full of oxygen, while carbon is also by metal inside for metal
It diffuses to the surface.If the speed of oxidation is slower than the speed that carbon is diffused to the surface by metal inside, decarburization just occurs.
12Cr1MoVG is the typical low-alloy steel in GB/T5310 standard, and decarburized layer requires inner surface in GB/T5310-2008 standard
≤ 0.4mm, outer surface≤0.3mm, surfaces externally and internally and≤0.6mm, decarburized layer requirement is interior in new standard GB/T5310-2017
Surface≤0.3mm, outer surface≤0.2mm, surfaces externally and internally and≤0.4mm, the differences between new standard and old standard is larger, in Steel Tube Heat Treatment Process
In be difficult control decarburized layer, cause tube quality unqualified, increase production cost, tube quality decline.
Summary of the invention
The present invention is in view of the foregoing drawbacks, and it is an object of the present invention to provide a kind of rational technology, can be effectively controlled practical decarburized depth and meet
A kind of control method of small-bore 12Cr1MoVG steel pipe decarburized layer of standard requirements.
Thus the technical solution adopted by the present invention is that: the control method of small-bore 12Cr1MoVG steel pipe decarburized layer includes
Following steps: arranging drying process before normalized treatment technique, implements tempering process in carburetting atmosphere.
The normalizing process: 980 DEG C~1000 DEG C of temperature, soaking time >=10 minute.
The tempering process: 720 DEG C~740 DEG C of temperature, soaking time >=30 minute.
The drying process carries out steel pipe drying process under the conditions of 550 DEG C~650 DEG C of temperature.
Increase natural gas in tempering process or liquefied petroleum gas device is supplied into furnace, changes furnace atmosphere, make
Carburetting atmosphere.
In drying process: steel pipe drying carries out in drying box, and steam (vapor) outlet is arranged in dry upper box part, dry
Gas feed is arranged in case side, and the gas feed, which is filled, sets inert gas, fills the density for setting inert gas greater than vapor
Density.
When flowing up after vapor generation, inert gas is passed through by the gas feed.
The steel pipe is vacantly arranged in the drying box, is provided on the outside of the drying box for conveying the steel pipe
Conveying roller, the through-hole that the drying box is penetrated and is pierced by for steel pipe is provided with sealing device.
The invention has the advantages that by implementing drying process, suitable heat treatment process and the carburetting work in drawing process
Skill can efficiently control the decarburized layer deepness in 12Cr1MoVG Steel Tube Heat Treatment Process, it is made to comply fully with new standard GB/
The decarburized layer requirement of T5310-2017, and standard requirements are fully achieved in steel tube performance.
Detailed description of the invention
Fig. 1 is drying of the present invention and normalizing process coordinate diagram.
Fig. 2 is tempering process coordinate diagram of the present invention.
Specific embodiment
Embodiment one:
The control method of small-bore 12Cr1MoVG steel pipe decarburized layer, includes following steps: being arranged before normalized treatment technique
Drying process implements tempering process in carburetting atmosphere.
The normalizing process: 1000 DEG C of temperature, soaking time >=10 minute.
The tempering process: 730 DEG C of temperature, soaking time >=30 minute.
The drying process carries out steel pipe drying process under the conditions of 600 DEG C of temperature.
Furnace atmosphere is controlled in tempering process implementation process and makes up to reducing atmosphere, while being increased in the middle part of heat treatment
Add natural gas or liquefied petroleum gas device to supply into furnace, changes furnace atmosphere, make carburetting atmosphere.
In drying process: steel pipe drying carries out in drying box, and steam (vapor) outlet is arranged in dry upper box part, dry
Gas feed is arranged in case side, and the gas feed, which is filled, sets inert gas, fills the density for setting inert gas greater than vapor
Density.
When flowing up after vapor generation, inert gas is passed through by the gas feed.
The steel pipe is vacantly arranged in the drying box, is provided on the outside of the drying box for conveying the steel pipe
Conveying roller, the through-hole that the drying box is penetrated and is pierced by for steel pipe is provided with sealing device.
Embodiment two:
The control method of small-bore 12Cr1MoVG steel pipe decarburized layer, includes following steps: being arranged before normalized treatment technique
Drying process implements tempering process in carburetting atmosphere.
The normalizing process: 990 DEG C of temperature, soaking time >=10 minute.
The tempering process: 720 DEG C of temperature, soaking time >=30 minute.
The drying process carries out steel pipe drying process under the conditions of 580 DEG C of temperature.
Increase natural gas in tempering process or liquefied petroleum gas device is supplied into furnace, changes furnace atmosphere, make
Carburetting atmosphere.
In drying process: steel pipe drying carries out in drying box, and steam (vapor) outlet is arranged in dry upper box part, dry
Gas feed is arranged in case side, and the gas feed, which is filled, sets inert gas, fills the density for setting inert gas greater than vapor
Density.
When flowing up after vapor generation, inert gas is passed through by the gas feed.
The steel pipe is vacantly arranged in the drying box, is provided on the outside of the drying box for conveying the steel pipe
Conveying roller, the through-hole that the drying box is penetrated and is pierced by for steel pipe is provided with sealing device.
Control method of the present invention removes H by drying process before effectively implementation normalizing2O is the largest decarburized layer influence
Factor reaches the depth of decarburized layer in effectively control normalizing procedure；(2) suitable according to new standard GB/T5310-2017 is met
Heat treatment process, so that steel tube performance complies fully with standard requirements after heat treatment；(3) it is controlled in tempering process implementation process
Furnace atmosphere increases carburetting atmosphere, effectively reduces the decarburization in drawing process；Reach effective control by 3 steps
Decarburized layer deepness in 12Cr1MoVG Steel Tube Heat Treatment Process makes it comply fully with the decarburized layer of new standard GB/T5310-2017
It is required that.
Claims (8)
1. the control method of small-bore 12Cr1MoVG steel pipe decarburized layer, which is characterized in that include following steps: at normalizing
Drying process is arranged before science and engineering skill, implements tempering process in carburetting atmosphere.
2. the control method of small-bore 12Cr1MoVG steel pipe decarburized layer according to claim 1, which is characterized in that described
Normalizing process: 980 DEG C~1000 DEG C of temperature, soaking time >=10 minute.
3. the control method of small-bore 12Cr1MoVG steel pipe decarburized layer according to claim 1, which is characterized in that described
Tempering process: 720 DEG C~740 DEG C of temperature, soaking time >=30 minute.
4. the control method of small-bore 12Cr1MoVG steel pipe decarburized layer according to claim 1, which is characterized in that described
Drying process carries out steel pipe drying process under the conditions of 550 DEG C~650 DEG C of temperature.
5. the control method of small-bore 12Cr1MoVG steel pipe decarburized layer according to claim 1, which is characterized in that tempering
Increase natural gas in technique or liquefied petroleum gas device is supplied into furnace, changes furnace atmosphere, make carburetting atmosphere.
6. the control method of small-bore 12Cr1MoVG steel pipe decarburized layer according to claim 1, which is characterized in that dry
During drying process: steel pipe drying carries out in drying box, steam (vapor) outlet is arranged in dry upper box part, gas is arranged in drying box side
Body import, the gas feed, which is filled, sets inert gas, fills and sets density of the density of inert gas greater than vapor.
7. the control method of small-bore 12Cr1MoVG steel pipe decarburized layer according to claim 6, which is characterized in that in water
When steam flows up after generating, inert gas is passed through by the gas feed.
8. the control method of small-bore 12Cr1MoVG steel pipe decarburized layer according to claim 6, which is characterized in that described
Steel pipe is vacantly arranged in the drying box, and the conveying roller for conveying the steel pipe, institute are provided on the outside of the drying box
It states the through-hole that drying box is penetrated and is pierced by for steel pipe and is provided with sealing device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811569491.6A CN109439886A (en) | 2018-12-21 | 2018-12-21 | The control method of small-bore 12Cr1MoVG steel pipe decarburized layer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811569491.6A CN109439886A (en) | 2018-12-21 | 2018-12-21 | The control method of small-bore 12Cr1MoVG steel pipe decarburized layer |
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| CN109439886A true CN109439886A (en) | 2019-03-08 |
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| CN201811569491.6A Pending CN109439886A (en) | 2018-12-21 | 2018-12-21 | The control method of small-bore 12Cr1MoVG steel pipe decarburized layer |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109929972A (en) * | 2019-04-02 | 2019-06-25 | 浙江明贺钢管有限公司 | A kind of steel pipe non-oxidation normalizing process and device |
| CN113702132A (en) * | 2021-09-10 | 2021-11-26 | 广东韶钢松山股份有限公司 | Detection method for paracrystallized steel decarburized layer containing abnormal structure |
Citations (4)
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| CN101775478A (en) * | 2010-03-30 | 2010-07-14 | 青岛奔达汽车配件有限公司 | Gear ring nitrogen protection continuous type normalizing process |
| CN102409346A (en) * | 2011-11-21 | 2012-04-11 | 重庆潍柴发动机厂 | Carbonization hardening and tempering process for connecting rod of high-power diesel engine |
| CN103060539A (en) * | 2012-12-31 | 2013-04-24 | 江苏兴达钢帘线股份有限公司 | Method for controlling decarburization of fine heat-treated steel wire |
| CN107245556A (en) * | 2017-05-18 | 2017-10-13 | 江苏电力装备有限公司 | 12Cr1MoVG thin-walled medium frequency bending of pipe Technologies for Heating Processing |
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2018
- 2018-12-21 CN CN201811569491.6A patent/CN109439886A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101775478A (en) * | 2010-03-30 | 2010-07-14 | 青岛奔达汽车配件有限公司 | Gear ring nitrogen protection continuous type normalizing process |
| CN102409346A (en) * | 2011-11-21 | 2012-04-11 | 重庆潍柴发动机厂 | Carbonization hardening and tempering process for connecting rod of high-power diesel engine |
| CN103060539A (en) * | 2012-12-31 | 2013-04-24 | 江苏兴达钢帘线股份有限公司 | Method for controlling decarburization of fine heat-treated steel wire |
| CN107245556A (en) * | 2017-05-18 | 2017-10-13 | 江苏电力装备有限公司 | 12Cr1MoVG thin-walled medium frequency bending of pipe Technologies for Heating Processing |
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| 杨必应等: ""电站锅炉12Cr1MoVG高温联箱蒸汽腐蚀分析"", 《中国科技信息》 * |
| 郭赞扬等: ""高压锅炉管12Cr1MoVG热处理工艺的改进"", 《江西冶金》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109929972A (en) * | 2019-04-02 | 2019-06-25 | 浙江明贺钢管有限公司 | A kind of steel pipe non-oxidation normalizing process and device |
| CN113702132A (en) * | 2021-09-10 | 2021-11-26 | 广东韶钢松山股份有限公司 | Detection method for paracrystallized steel decarburized layer containing abnormal structure |
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Application publication date: 20190308 |