CN106222525B - A method of reducing 34CrNi3Mo susceptibility of flake formations - Google Patents
A method of reducing 34CrNi3Mo susceptibility of flake formations Download PDFInfo
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- CN106222525B CN106222525B CN201610761688.4A CN201610761688A CN106222525B CN 106222525 B CN106222525 B CN 106222525B CN 201610761688 A CN201610761688 A CN 201610761688A CN 106222525 B CN106222525 B CN 106222525B
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/52—Manufacture of steel in electric furnaces
- C21C5/54—Processes yielding slags of special composition
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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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/005—Modifying the physical properties by deformation combined with, or followed by, heat treatment of ferrous alloys
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Abstract
The invention discloses a kind of methods reducing 34CrNi3Mo susceptibility of flake formations, belong to field of alloy material, and the method that the present invention uses includes smelting twice, then forges, quenching+tempering operation is directly carried out after the completion of forging；The above method using the present invention can substantially reduce 34CrNi3Mo susceptibility of flake formations.The product prepared using above-mentioned process substantially reduces heat treatment cycle compared with slow cooling mode after traditional forging, prevents 34CrNi3Mo white points from being formed, and greatly improves production efficiency, and productivity effect improves 10% or more.
Description
Technical field
The present invention relates to field of alloy material more particularly to a kind of methods reducing 34CrNi3Mo susceptibility of flake formations.
Background technology
34CrNi3Mo is a kind of high-strength alloy structural steel, typical chemical composition：Carbon C0.30 ~ 0.40, silicon
Si0.17 ~ 0.37, manganese Mn0.50 ~ 0.80, phosphorus P≤0.035, sulphur S≤0.035, chromium Cr0.70 ~ 1.10, nickel 2.75 ~
3.25, molybdenum Mo0.25 ~ 0.40, copper Cu≤0.20；It is a kind of high-strength material, heat treatment performance is stablized, and varies with temperature
It is smaller, mechanical property：
Tensile strength sigma b (MPa)：It is quenched, >=1030~1230
Yield strength σ 0.2 (MPa)：It is quenched, >=885
Elongation δ 5 (%)：It is quenched, >=10
Contraction percentage of area ψ (%)：It is quenched, >=50
Notched bar impact strength Akv：It is quenched, >=56
Hardness：302~363；
Since it is with good comprehensive mechanical performance and processing performance, it is commonly used to large-size steam turbine monobloc forging low pressure at present
Rotor steel or the fasteners such as turbine rotor and turbine bolt, nut.
But using current production method, larger product easily generates white point.
It is in smooth silvery white spot that white point, which refers on the vertical section of steel, is in then more hair on cross section after pickling
Filamentous crackle；White point makes the elongation of steel be remarkably decreased, and especially the contraction percentage of area and impact flexibility reduce more, therefore deposit
It cannot subsequently be used in the steel of white point.
Invention content
The purpose of the present invention, in that a kind of method reducing 34CrNi3Mo susceptibility of flake formations is provided, to solve above-mentioned ask
Topic.
To achieve the goals above, the technical solution adopted by the present invention is such：A kind of reduction 34CrNi3Mo white points are quick
The method of perception, includes the following steps：
（1）Primary smelting：
Slag charge and ratio Wt%：CaO：CaF2=1.1~1.5:1.0；
Baking temperature and time：>=850 DEG C of heat preservation >=10h；
（2）Secondary smelting：
Slag charge and ratio Wt%：CaF2:Al2O3:CaO:MgO =58~62:22~28:8~12:4~6；
Baking temperature and time：>=850 DEG C of heat preservations >=10；
（3）Forging directly carries out quenching+tempering operation after the completion of forging；The specific method is as follows：
Quenching：By workpiece heat to 860 ± 10 DEG C of heat preservations after forging（H*0.7）In min, oil cooling or similar cooling rate medium
It is cooled to≤150 DEG C, then is air-cooled to 50 ~ 80 DEG C；
Tempering：It is tempered in time after quenching, by workpiece heat to 650 ± 5 DEG C of progress high temperings after quenching, then keep the temperature 30 ~
Be furnace-cooled to after 40h 500 DEG C come out of the stove it is air-cooled.
White point is the above method using the present invention since hydrogen content is excessively and caused by internal stress collective effect in steel,
34CrNi3Mo susceptibility of flake formations can substantially be reduced.Its mechanism is：Steel in process of production, are especially inhaled in smelting process
Gas（Hydrogen）Caused by, so the present invention uses the baking means of smelting slag, in addition it is exactly the processing after forging, how further
Reduce white point tendency, direct quenching+tempering after forging, main application is：Dehydrogenation（Pass through solubility of the hydrogen in different tissues
It is different and further exclude the hydrogen inside steel（Hydrogen solubility in austenite is high, is dissolved in martensite or bainite
It spends low）.
The product prepared using above-mentioned process, compared with slow cooling mode after traditional forging, larger product is normal
Production needs slow cooling, and temperature retention time is depending on specification, probably at 3 ~ 7 days, and then saves this temperature retention time using the present invention,
Also heat treatment cycle is just substantially reduced, prevents 34CrNi3Mo white points from being formed, greatly improves production efficiency, productivity effect carries
It is high by 10% or more.
As preferred technical solution：Step（1）It is carried out in intermediate frequency furnace.
As preferred technical solution：Step（2）It is carried out in electroslag furnace.
As preferred technical solution：Step（3）Forging step carried out in press.
As preferred technical solution：Step（1）In, slag charge and ratio Wt%：CaO：CaF2=1.2:1.0。
As preferred technical solution：Step（2）In, slag charge and ratio Wt%：CaF2:Al2O3:CaO:MgO =60:25:
10:5。
Compared with prior art, the beneficial effects of the invention are as follows：The above method using the present invention can substantially reduce
34CrNi3Mo susceptibility of flake formations.The product prepared using above-mentioned process, compared with slow cooling mode after traditional forging, greatly
Shorten heat treatment cycle greatly, prevent 34CrNi3Mo white points from being formed, greatly improve production efficiency, productivity effect improve 10% with
On.
Specific implementation mode
Below in conjunction with embodiment, the invention will be further described.
Embodiment 1
A method of reducing 34CrNi3Mo susceptibility of flake formations, includes the following steps：
（1）Primary smelting is carried out in intermediate frequency furnace：
Slag charge and ratio Wt%：CaO：CaF2=1.2:1.0；
Baking temperature and time：860 DEG C of heat preservation 12h；
（2）Secondary smelting is carried out in electroslag furnace：
Slag charge and ratio Wt%：CaF2:Al2O3:CaO:MgO =60:25:10:5；
Baking temperature and time：860 DEG C of heat preservation >=11h；
（3）It is forged in press, quenching+tempering operation is directly carried out after the completion of forging；The specific method is as follows：
Quenching：By workpiece heat to 860 DEG C of heat preservations after forging（H*0.7）Min, oil cooling is cooled to≤150 DEG C, then is air-cooled to
60℃；
Tempering：It is tempered in time after quenching, by workpiece heat to 650 DEG C of progress high temperings after quenching, then keeps the temperature stove after 30h
Be cooled to 500 DEG C come out of the stove it is air-cooled to get product A.
Embodiment 2
A method of reducing 34CrNi3Mo susceptibility of flake formations, includes the following steps：
（1）Primary smelting is carried out in intermediate frequency furnace：
Slag charge and ratio Wt%：CaO：CaF2=1.1:1.0；
Baking temperature and time：850 DEG C of heat preservation 10h；
（2）Secondary smelting is carried out in electroslag furnace：
Slag charge and ratio Wt%：CaF2:Al2O3:CaO:MgO =58:28:8:6；
Baking temperature and time：850 DEG C of heat preservation >=10h；
（3）It is forged in press, quenching+tempering operation is directly carried out after the completion of forging；The specific method is as follows：
Quenching：By workpiece heat to 850 DEG C of heat preservations after forging（H*0.7）Min, oil cooling is cooled to≤150 DEG C, then is air-cooled to
50℃；
Tempering：It is tempered in time after quenching, by workpiece heat to 645 DEG C of progress high temperings after quenching, then keeps the temperature stove after 40h
Be cooled to 500 DEG C come out of the stove it is air-cooled to get product B.
Embodiment 3
A method of reducing 34CrNi3Mo susceptibility of flake formations, includes the following steps：
（1）Primary smelting is carried out in intermediate frequency furnace：
Slag charge and ratio Wt%：CaO：CaF2=1.5:1.0；
Baking temperature and time：870 DEG C of heat preservation 10h；
（2）Secondary smelting is carried out in electroslag furnace：
Slag charge and ratio Wt%：CaF2:Al2O3:CaO:MgO =62:22:12:4；
Baking temperature and time：850 DEG C of heat preservation >=11h；
（3）It is forged in press, quenching+tempering operation is directly carried out after the completion of forging；The specific method is as follows：
Quenching：By workpiece heat to 870 DEG C of heat preservations after forging（H*0.7）Min, oil cooling is cooled to≤150 DEG C, then is air-cooled to
80℃；
Tempering：It is tempered in time after quenching, by workpiece heat to 655 DEG C of progress high temperings after quenching, then keeps the temperature stove after 35h
Be cooled to 500 DEG C come out of the stove it is air-cooled to get products C.
4 properties of product of embodiment are tested
Embodiment 1-3 resulting products A, product B, products C, heat treatment time are respectively 35h, 39h, 40h, and tradition side
Method heat treatment time is 45h,
In addition, the contraction percentage of area of product A, product B, products C is respectively increased 15.1%, 13.5% relative to conventional method
With 13.1%；Product A, product B, products C impact flexibility relative to conventional method, be respectively increased 18.5%, 16.5% and 16.3%.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
All any modification, equivalent and improvement etc., should all be included in the protection scope of the present invention made by within refreshing and principle.
Claims (4)
1. a kind of method reducing 34CrNi3Mo susceptibility of flake formations, which is characterized in that include the following steps：
（1）Primary smelting：
Slag charge and ratio Wt %：CaO:CaF2=1 .2:1 .0；
Baking temperature and time：>=850 DEG C, keep the temperature >=10 h；
（2）Secondary smelting：
Slag charge and ratio Wt %：CaF2:Al2O3:CaO:MgO =60:25:10:5；
Baking temperature and time：>=850 DEG C, keep the temperature >=10 h；
（3）Forging directly carries out quenching+tempering operation after the completion of forging；The specific method is as follows：
Quenching：By workpiece heat to 860 ± 10 DEG C of heat preservation H*0 .7 min after forging, oil cooling is to≤150 DEG C, then is air-cooled to
50~80 ℃；
Tempering：It is tempered in time after quenching, by workpiece heat to 650 ± 5 DEG C of progress high temperings after quenching, then keeps the temperature 30 ~ 40
Be furnace-cooled to after h 500 DEG C come out of the stove it is air-cooled.
2. a kind of method reducing 34CrNi3Mo susceptibility of flake formations according to claim 1, it is characterised in that：Step（1）
It is carried out in intermediate frequency furnace.
3. a kind of method reducing 34CrNi3Mo susceptibility of flake formations according to claim 1, it is characterised in that：Step（2）
It is carried out in electroslag furnace.
4. a kind of method reducing 34CrNi3Mo susceptibility of flake formations according to claim 1, it is characterised in that：Step（3）
Forging step carried out in press.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610761688.4A CN106222525B (en) | 2016-08-30 | 2016-08-30 | A method of reducing 34CrNi3Mo susceptibility of flake formations |
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| CN201610761688.4A CN106222525B (en) | 2016-08-30 | 2016-08-30 | A method of reducing 34CrNi3Mo susceptibility of flake formations |
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| CN106222525A CN106222525A (en) | 2016-12-14 |
| CN106222525B true CN106222525B (en) | 2018-10-02 |
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| CN109457118B (en) * | 2019-01-04 | 2020-12-18 | 四川六合特种金属材料股份有限公司 | Method for reducing white spots in 10Ni3MnCuAl steel |
| CN111451425B (en) * | 2020-03-26 | 2023-01-03 | 攀钢集团江油长城特殊钢有限公司 | Forging method for controlling white point defect |
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| CN102357626B (en) * | 2011-08-27 | 2013-06-26 | 江阴振宏重型锻造有限公司 | Method for forging and pressing semi-coupler with large section and high height-diameter ratio by using 31.5 MN of oil press |
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Address after: 621700 West Section of Baolun Road, Henan Industrial Park, Jiangyou City, Chengdu City, Sichuan Province Patentee after: Sichuan Liuhe Special Metal Materials Co., Ltd. Address before: 621700 West Section of Baolun Road, Henan Industrial Park, Jiangyou City, Chengdu City, Sichuan Province Patentee before: Sichuan Liuhe Forging Company Ltd. |