CN109666782A - A method of improving 0Cr13Ni4Mo steel low-temperature impact toughness - Google Patents
A method of improving 0Cr13Ni4Mo steel low-temperature impact toughness Download PDFInfo
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- CN109666782A CN109666782A CN201910006300.3A CN201910006300A CN109666782A CN 109666782 A CN109666782 A CN 109666782A CN 201910006300 A CN201910006300 A CN 201910006300A CN 109666782 A CN109666782 A CN 109666782A
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- Prior art keywords
- 0cr13ni4mo
- improving
- impact toughness
- temperature impact
- steel
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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
-
- 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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/004—Heat treatment of ferrous alloys containing Cr and Ni
-
- 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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/008—Martensite
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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 Steel (AREA)
Abstract
The present invention provides a kind of method for improving 0Cr13Ni4Mo steel low-temperature impact toughness comprising following steps: being forged when (1) forging using right-angled intersection, a upsetting pull and primary pulling processing are successively carried out to 0Cr13Ni4Mo steel ingot；(2) 0Cr13Ni4Mo steel is first to heat to 850~900 DEG C of 0.5~1h of heat preservation when being heat-treated, then 980~1020 DEG C of progress oil quenching processing are warming up to the rate of 2~3 DEG C/min, then 550~600 DEG C of progress, 2 temperings is heated to the rate of 3~5 DEG C/min；(3) control finished product in phosphorus, nitrogen, molybdenum each element content.Using processing method of the invention, 0Cr13Ni4Mo low-temperature impact toughness can be significantly improved, -40 DEG C of KV2 are up to 220J or more；When preparing larger product, service performance is greatly promoted.
Description
Technical field
The invention belongs to alloy smelting technology fields, and in particular to a kind of to improve 0Cr13Ni4Mo steel low-temperature impact toughness
Method.
Background technique
0Cr13Ni4Mo belongs to stainless steel martensitic material, is equivalent to U.S. trade mark F6NM.Its chemical analysis is as follows: C≤
0.05%, Mn 0.5-1.0%, P≤0.03%, S≤0.03%, Cr:11.5-14.0%, Mo:0.5-1.0%, Ni:3.5-
5.5%.0Cr13Ni4Mo steel has high-intensitive, high tenacity and good welding performance, and surface hardness is high, can satisfy water conservancy
Engineering flow passage components bear the requirement of silt underwashing for a long time, be mainly used in the blade of the hydraulic turbine, wearing plate, facing plate, leak-stopping ring material,
On the flow passage components such as the embedded part of hydraulic engineering.
After heat treatment mechanical performance is as follows for 0Cr13Ni4Mo steel:
Tensile strength: >=950MPa；Surrender: >=800MPa；Elongation: >=15%；Shrinking percentage: >=45%；Hardness: 321
~361；Impact flexibility: 20 DEG C of KV2 >=160J；-40℃KV2≥80J.
0Cr13Ni4Mo is because have preferable mechanical performance and corrosion resistance to be widely used in nuclear power, petroleum machine at present
The fields such as tool, valve.But using current production method, larger product low temperature impact properties are easy that there are overproof situations.
Prior art has no excessive report for how to improve the low-temperature impact toughness of larger product 0Cr13Ni4Mo steel,
Therefore need to provide a kind of processing mode to solve the problems, such as that 0Cr13Ni4Mo steel steel low temperature impact properties are poor.
Summary of the invention
The object of the invention is in order to solve the above-mentioned technical problem, and provide a kind of raising 0Cr13Ni4Mo steel low temperature punching
The method for hitting toughness.Method provided by the invention can significantly improve the low temperature impact properties of 0Cr13Ni4Mo steel, especially exist
There can be good performance when preparing larger product.
To achieve the goals above, The technical solution adopted by the invention is as follows: a kind of raising 0Cr13Ni4Mo steel low temperature rushes
The method for hitting toughness, comprising the following steps:
(1) it is forged when forging using right-angled intersection, a upsetting pull and primary pulling is successively carried out to 0Cr13Ni4Mo steel ingot
Processing；
(2) 0Cr13Ni4Mo steel is first to heat to 850~900 DEG C of 0.5~1h of heat preservation when being heat-treated, then with 2~3 DEG C/
The rate of min is warming up to 980~1020 DEG C of progress oil quenching processing, then with the rate of 3~5 DEG C/min be heated to 550~600 DEG C into
2 temperings of row；
(3) control finished product in phosphorus, nitrogen, molybdenum each element content.
The present invention is that, since forging technology will affect the performance of alloy, the present invention examines first using the principle of the above method
The selection for considering forging technology combines a upsetting pull and primary pulling to handle by using right-angled intersection forging method, can be very
Ensure that big specification forging center portion forging is saturating well.Under the premise of this, invention further contemplates heat treatment process to 0Cr13Ni4Mo
The influence of steel impact property, since the influence of heat treatment process is extremely significant, heating mode is also larger on impact property influence, this
Invention uses above-mentioned heat treatment process, and combines suitable heating step, it can be ensured that in above-mentioned tempering range, substantially
There is no nitride precipitation, it is uneven to avoid result in material at low temperature impact flexibility.Above-mentioned heat treatment process ensure that very well to be prepared
Its low temperature impact properties is excellent when larger product, is compared with the traditional method its low-temperature impact toughness and is significantly improved.Knot
On the basis of closing forging technology and heat treatment process of the invention, in order to further control smelting process, it is low preferably to promote its
Warm impact property, the present invention also need the content of phosphorus, nitrogen and molybdenum each element in control finished product.The method for wherein controlling phosphorus content is choosing
Preferentially fire resistant materials prevent crucible from increasing P；High-quality low-phosphorous raw material ingredient is selected to smelt.The method for controlling N is in smelting process
Full name carries out blowing Ar gas, it is ensured that smelting process air-breathing.The content of control Mo can sufficiently inhibit Low-Temperature Temper Brittleness.
Further, the method that right-angled intersection is forged in step (1) are as follows: steel ingot opens flat, and finished product forges time width deformation
For thickness direction, thickness deformation is width direction.
Further, controlled forge process ratio is 10~12 in step (1).
Further, the time that water quenching is kept the temperature in step (2) is 30~60min.
Further, the time of 2 tempering heat preservations is 1.5~4h.
Further, carrying out air-cooled to room temperature after step (2) tempering, rate of temperature fall control is 2-5 DEG C/min.
Further, controlling finished product phosphorus mass percentage≤0.010% in step (3).
Further, controlling product nitrogen mass percentage≤0.020% in step (3).
Further, controlling finished product Mo mass percentage 0.80~1.00% in step (3).
Compared with prior art, beneficial effects of the present invention are as follows: the method that the present invention uses can be obviously improved
The low-temperature impact toughness of 0Cr13Ni4Mo steel, compared with normative heat treatment method, low-temperature impact toughness is significantly mentioned
Height, -40 DEG C of KV2 are up to 220J or more；When preparing larger product, service performance is greatly promoted.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to embodiments to the present invention
It is specifically described, it is necessary to, it is noted that following embodiment is used only for that the present invention is explained and illustrated, be not used to
Limit the present invention.Some nonessential modifications and adaptations that those skilled in the art are made according to foregoing invention content, still belong to
In protection scope of the present invention.
Embodiment 1
A method of improving 0Cr13Ni4Mo steel low-temperature impact toughness, comprising the following steps:
(1) it is forged when forging using right-angled intersection, controlled forge process ratio is 10, is successively carried out to 0Cr13Ni4Mo steel ingot primary
Upsetting pull and primary pulling processing；
(2) 0Cr13Ni4Mo steel is first to heat to 850 DEG C of heat preservation 0.5h when being heat-treated, then with the rate liter of 2 DEG C/min
For temperature to 980 DEG C of progress oil quenching processing, oil quenching soaking time is 30min, is heated to 550 DEG C again after cooling with the rate of 3 DEG C/min
2 temperings are carried out, 2 times tempering insulation time is 1.5h；It is carried out after tempering air-cooled to room temperature, rate of temperature fall control
For 2 DEG C/min；
(3) it is as follows to control phosphorus, nitrogen, the content of molybdenum each element in finished product: control finished product phosphorus mass percentage is
0.002%, product nitrogen mass percentage 0.015% is controlled, finished product molybdenum mass percentage 0.81% is controlled.
The method of above-mentioned right-angled intersection forging are as follows: steel ingot opens flat, and finished product forging time width is deformed into thickness direction, and thickness becomes
Shape is width direction, it is ensured that the forging of forging center portion is saturating.
Embodiment 2
A method of improving 0Cr13Ni4Mo steel low-temperature impact toughness, comprising the following steps:
(1) it is forged when forging using right-angled intersection, controlled forge process ratio is 11, is successively carried out to 0Cr13Ni4Mo steel ingot primary
Upsetting pull and primary pulling processing；
(2) 0Cr13Ni4Mo steel is first to heat to 860 DEG C of heat preservation 50min when being heat-treated, then with the rate liter of 3 DEG C/min
Temperature to 1000 DEG C of progress oil quenching processing, oil quenching soaking time is 45min, is heated to 560 DEG C again after cooling with the rate of 4 DEG C/min
2 temperings are carried out, 2 times tempering insulation time is 2.5h；It is carried out after tempering air-cooled to room temperature, rate of temperature fall control
For 3 DEG C/min；
(3) it is as follows that phosphorus, nitrogen, the content of molybdenum each element in finished product are controlled: control finished product phosphorus mass percentage 0.003%,
Product nitrogen mass percentage 0.012% is controlled, finished product molybdenum mass percentage 0.82% is controlled.
The method of above-mentioned right-angled intersection forging are as follows: steel ingot opens flat, and finished product forging time width is deformed into thickness direction, and thickness becomes
Shape is width direction, it is ensured that the forging of forging center portion is saturating.
Embodiment 3
A method of improving 0Cr13Ni4Mo steel low-temperature impact toughness, comprising the following steps:
(1) it is forged when forging using right-angled intersection, controlled forge process ratio is 12, is successively carried out to 0Cr13Ni4Mo steel ingot primary
Upsetting pull and primary pulling processing；
(2) 0Cr13Ni4Mo steel is first to heat to 900 DEG C of heat preservation 1h when being heat-treated, is then heated up with the rate of 3 DEG C/min
To 1020 DEG C of progress oil quenching processing, oil quenching soaking time is 60min, after cooling again with the rate of 5 DEG C/min be heated to 600 DEG C into
2 temperings of row, 2 times tempering insulation time is 4h；Carry out air-cooled to room temperature after tempering, rate of temperature fall control is 5
℃/min；
(3) it is as follows that phosphorus, nitrogen, the content of molybdenum each element in finished product are controlled: control finished product phosphorus mass percentage 0.006%,
Product nitrogen mass percentage 0.018% is controlled, finished product molybdenum mass percentage 0.83% is controlled.
The method of above-mentioned right-angled intersection forging are as follows: steel ingot opens flat, and finished product forging time width is deformed into thickness direction, and thickness becomes
Shape is width direction, it is ensured that the forging of forging center portion is saturating.
Experimental example
Low-temperature impact toughness detection is carried out to the product that aforesaid way is produced, test method uses standard GB/T/T
229-2007 " metal material Charpy pendulum impact test method ", testing result is shown in Table 1.
Table 1
As can be seen from the above table, using the processing method in the embodiment of the present invention, it is low 0Cr13Ni4Mo can be significantly improved
Warm impact flexibility.
Claims (9)
1. a kind of method for improving 0Cr13Ni4Mo steel low-temperature impact toughness, which comprises the following steps:
(1) it is forged when forging using right-angled intersection, a upsetting pull and primary pulling processing is successively carried out to 0Cr13Ni4Mo steel ingot；
(2) 0Cr13Ni4Mo steel is first to heat to 850~900 DEG C of 0.5~1h of heat preservation when being heat-treated, then with 2~3 DEG C/min's
Rate is warming up to 980~1020 DEG C of progress oil quenching processing, then is heated to 550~600 DEG C with the rate of 3~5 DEG C/min and carries out 2 times
Tempering；
(3) control finished product in phosphorus, nitrogen, molybdenum each element content.
2. the method according to claim 1 for improving 0Cr13Ni4Mo steel low-temperature impact toughness, which is characterized in that step
(1) method that right-angled intersection is forged in are as follows: steel ingot opens flat, and finished product forging time width is deformed into thickness direction, and thickness deformation is width
Spend direction.
3. the method according to claim 2 for improving 0Cr13Ni4Mo steel low-temperature impact toughness, which is characterized in that step
(1) controlled forge process ratio is 10~12 in.
4. the method according to claim 1 for improving 0Cr13Ni4Mo steel low-temperature impact toughness, which is characterized in that step
(2) time that oil quenching is kept the temperature in is 30~60min.
5. the method according to claim 1 for improving 0Cr13Ni4Mo steel low-temperature impact toughness, which is characterized in that 2 times times
The time of fire heat preservation is 1.5~4h.
6. the method according to claim 1 for improving 0Cr13Ni4Mo steel low-temperature impact toughness, which is characterized in that step
(2) carry out air-cooled to room temperature after tempering, rate of temperature fall control is 2-5 DEG C/min.
7. the method according to claim 1 for improving 0Cr13Ni4Mo steel low-temperature impact toughness, which is characterized in that step
(3) finished product phosphorus mass percentage≤0.010% is controlled in.
8. the method according to claim 7 for improving 0Cr13Ni4Mo steel low-temperature impact toughness, which is characterized in that step
(3) product nitrogen mass percentage≤0.020% is controlled in.
9. the method according to claim 8 for improving 0Cr13Ni4Mo steel low-temperature impact toughness, which is characterized in that step
(3) finished product Mo mass percentage 0.80~1.00% is controlled in.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910006300.3A CN109666782A (en) | 2019-01-04 | 2019-01-04 | A method of improving 0Cr13Ni4Mo steel low-temperature impact toughness |
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| CN201910006300.3A CN109666782A (en) | 2019-01-04 | 2019-01-04 | A method of improving 0Cr13Ni4Mo steel low-temperature impact toughness |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110592489A (en) * | 2019-09-12 | 2019-12-20 | 张家港海锅新能源装备股份有限公司 | Production method of F6NM martensitic stainless steel pump shaft forging raw material |
| CN113523165A (en) * | 2021-07-12 | 2021-10-22 | 江阴市恒业锻造有限公司 | Hydrogen sulfide resistant stainless steel forging for oil exploitation operation and preparation method thereof |
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| CN102864382A (en) * | 2012-07-26 | 2013-01-09 | 四川六合锻造股份有限公司 | Method for reducing X20Cr13 longitudinal and transverse mechanical property differences |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110592489A (en) * | 2019-09-12 | 2019-12-20 | 张家港海锅新能源装备股份有限公司 | Production method of F6NM martensitic stainless steel pump shaft forging raw material |
| CN110592489B (en) * | 2019-09-12 | 2021-07-06 | 张家港海锅新能源装备股份有限公司 | Production method of F6NM martensitic stainless steel pump shaft forging raw material |
| CN113523165A (en) * | 2021-07-12 | 2021-10-22 | 江阴市恒业锻造有限公司 | Hydrogen sulfide resistant stainless steel forging for oil exploitation operation and preparation method thereof |
| CN113523165B (en) * | 2021-07-12 | 2023-01-20 | 江阴市恒业锻造有限公司 | Hydrogen sulfide resistant stainless steel forging for oil exploitation operation and preparation method thereof |
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| CB02 | Change of applicant information |
Address after: 621700 Yanghe Village, Sanhe Town, Jiangyou City, Mianyang City, Sichuan Province Applicant after: Sichuan Liuhe Special Metal Materials Co., Ltd. Address before: 621700 Yanghe Village, Sanhe Town, Jiangyou City, Mianyang City, Sichuan Province Applicant before: Sichuan Liuhe Forging Company Ltd. |
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Application publication date: 20190423 |
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