CN106756509A - A kind of high-temperature alloy structural steel and its Technology for Heating Processing - Google Patents
A kind of high-temperature alloy structural steel and its Technology for Heating Processing Download PDFInfo
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- CN106756509A CN106756509A CN201611265306.5A CN201611265306A CN106756509A CN 106756509 A CN106756509 A CN 106756509A CN 201611265306 A CN201611265306 A CN 201611265306A CN 106756509 A CN106756509 A CN 106756509A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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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
-
- 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
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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
- C21D8/06—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
- C21D8/065—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires of ferrous alloys
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/005—Ferrous alloys, e.g. steel alloys containing rare earths, i.e. Sc, Y, Lanthanides
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
Abstract
A kind of high-temperature alloy structural steel and its Technology for Heating Processing, belong to technical field of alloy steel.Structural steel chemical component weight % is：C：0.23~0.27%, Si：≤ 0.20%, Mn：≤ 0.20%, P：≤ 0.008%, S：≤ 0.003%, Cr：2.85~3.05%, Mo：2.85~3.05%, Ni：0.80~1.0%, Nb：0.09~0.11%, V：≤ 0.20%, [O]：≤ 0.0020%, [N]：≤ 0.0080%, RE：0.0015~0.0035%, balance of Fe.Technique includes：Smelt：Using electric furnace+external refining+electric slag refusion and smelting；Forging/rolling；Annealing；Normalizing；Annealing；Quenching；Tempering.Advantage is that the 40CrNi3MoV medium carbon structural alloy steels that the elevated temperature strength of the steel is more common increase, and its fracture toughness and low cycle fatigue property can increase substantially the life-span also superior to 40CrNi3MoV steel；Cyclic stress effect, high temperature wear resistant and long life high-voltage container are born in suitable making.
Description
Technical field
The invention belongs to technical field of alloy steel, a kind of high-temperature alloy structural steel and its heat treatment work are in particular, provided
Skill, is suitable for high-temperature alloy structural steel.
Background technology
The high-pressure bottle of high temperature wear is born frequently with middle carbon Cr-Ni-Mo-V systems structural alloy steel, due to such pressure-volume high
Device requirement have high reliability and long-life, middle carbon Cr-Ni-Mo-V systems structural alloy steel often because of high temperature hardness and fatigue behaviour not
Cause initial failure enough.At present, conventional middle carbon Cr-Ni-Mo-V systems structural alloy steel Cr contents are generally below 2%, Mo and contain
Amount generally below 1%.Research discovery, by improving the content of the alloying elements such as Mo, Cr and V, M can be separated out through high tempering2C
Type carbide produce post-curing, so as to be effectively improved steel high-temperature behavior (Nie Changshen, plant gram end, Han Lihua, etc.
.28Cr2Mo1VA the Carbide Phases of steel analyze Arms Material scientific and engineerings, 1992,15 (7):41~57.).Therefore, improve
The content of Cr and Mo elements in steel, is one of effective way of its high-temperature behavior of improvement and service life.Inventor's early-stage Study
It was found that, 3% is brought up to by by Cr, Mo content, and use Nb microalloyings, it is ensured that the crystallite dimension of structural alloy steel is not
Significantly grow up, while improving post-curing performance, (Wang Maoqiu, Dong Han, Wang Qi wait austenitizings hard to 3Cr-3Mo-Nb bis- times
Change the influence Arms Material scientific and engineerings of the microstructure and mechanical property of steel, 2002,25 (5):9-13.).
The content of the invention
It is in previous work base it is an object of the invention to provide a kind of high-temperature alloy structural steel and its Technology for Heating Processing
On plinth, further consider by reducing [O], [N] gas content, and inclusion size control is carried out by RE.With conventional middle carbon
The difference of Cr-Ni-Mo-V systems structural alloy steel is：The content of Cr and Mo is improved to 3% or so, is further enhanced secondary
Hardening effect, so as to improve high temperature hardness and intensity；Using Nb as main micro alloying element, it can be at a higher temperature
Prevent Austenite Grain Growth effect；Carbon content in by improving cleanliness factor and appropriate reduction matrix, improves the toughness of steel；Pass through
[O], [N] gas content are reduced, and inclusion size control is carried out by RE, improve the fatigue behaviour of steel.
Additionally, the present invention is also designed and Technology for Heating Processing by rational alloy, a kind of novel fire resistant alloy knot is developed
Structure steel and its supporting Technology for Heating Processing.The 40CrNi3MoV medium carbon structural alloy steels that the elevated temperature strength of the steel is more common have been carried
Height, its fracture toughness and low cycle fatigue property can increase substantially the life-span also superior to 40CrNi3MoV steel.
Steel of the present invention and Technology for Heating Processing are applied to high-temperature alloy structural steel pressure vessel, are particularly suitable for making and bear week
Phase stress, high temperature wear resistant and long life high-voltage container.
The chemical composition ranges (weight %) of high-temperature alloy structural steel of the present invention are as follows：C：0.23~0.27%, Si：≤
0.20%, Mn：≤ 0.20%, P：≤ 0.008%, S：≤ 0.003%, Cr：2.85~3.05%, Mo：2.85~3.05%,
Ni：0.80~1.0%, Nb：0.09~0.11%, V：≤ 0.20%, [O]：≤ 0.0020%, [N]：≤ 0.0080%, RE：
0.0015~0.0035%, balance of Fe.
Each alloys producing and content design principle are as follows：
C：Form carbide and solid solution in the base, be optimal with 0.25%, enough carbon is difficult to ensure that less than 0.20%
Compound is separated out and elevated temperature strength, and toughness can be caused to reduce higher than 0.30%；
Si and Mn：Reducing content can reduce fragility, be optimal with less than 0.20% so as to improve toughness；
S：Harmful element, seriously reduces toughness.By multiple means, content is reduced as far as possible, to control below 0.003%
It is advisable.
P：Harmful element, seriously reduces toughness.By multiple means, content is reduced as far as possible, to control below 0.008%
It is advisable.
Cr：Carbide Precipitation reinforcing can be played, high-temperature oxidation resistance and solution strengthening effect are improved, with 3% for most
It is good, it is not notable less than 2.5% effect, difficulty of processing is increased higher than 3.5%；
Mo：Carbide precipitate post-curing, solution strengthening, raising grain-boundary strength, are optimal with 3%, less than 2.5% effect
It is insufficient, dramatically increase difficulty of processing higher than 3.5%；
Ni：Solution strengthening, raising toughness, are optimal with 0.9%, and toughness effect is improved less than 0.5% not substantially, are higher than
1% causes the cost to increase, and machines difficulty increase；
Nb：Because the carbide formers such as Cr and Mo are higher, hardening heat is higher, and Nb (C, N) particle, resistance are formed using Nb
Only Austenite Grain Growth during high temperature, is optimal with 0.10%, and precipitated phase is difficult to ensure that with enough crystalline substances during less than 0.05%
The big inhibition of grain length, easily causes carbide thick during higher than 0.15%；
V：Post-curing element, raises post-curing peak temperature, while also having certain to Austenite Grain Growth
Inhibition；
RE：Deoxidation and desulfurization, and make inclusion modification such that it is able to improve the toughness of steel, it is ensured that fatigue strength.It is less than
Act on unobvious more than when 0.0015%, its beneficial effect increase is not obvious during higher than 0.035%, reaches saturation.Therefore, RE contains
Amount should be controlled in 0.0015-0.0035%.
[N]：Combine to form compound with Nb, V etc. so that crystal grain thinning, but also can segregation crystal boundary and reduce grain-boundary strength.
Detrimental effect is obvious when content is higher than 0.0100%.Therefore, [N] content should control to be advisable below 0.0080%.
[O]：Pernicious gas, seriously reduces fatigue behaviour, influences the life-span.[O] content should be controlled by multiple means
Less than 0.0020% is advisable.
The technological process of production of steel of the present invention is as follows：
(1) smelt：Using electric furnace+external refining+electroslag remelting (protective atmosphere) smelting process；
(2) forging/rolling：Required according to size, can forge or be rolled into the bar of below Φ 150mm；Heating-up temperature exists
Between 1180~1200 DEG C, at 1160~1180 DEG C, final forging temperature is not less than 880 DEG C to starting forging temperature；
(3) anneal：According to practical condition, more than 8h is incubated in the annealing furnace between in temperature being 670~750 DEG C,
Then less than 500 DEG C are cooled to be not higher than the cooling rate of 40 DEG C/h, take out air cooling；
(4) normalizing：After being incubated 1-10h at 1125 ± 25 DEG C, air cooling is taken out；
(5) anneal：After being incubated 2-20h at 675 ± 25 DEG C, air cooling is taken out；
(6) quench：After being incubated 1-3h at 900 ± 20 DEG C, water quenching or oil quenching are taken out；
(7) it is tempered：After being incubated 2-5h at 620 ± 20 DEG C, air cooling is taken out；After 2-5h being incubated after alignment at 640 ± 20 DEG C again,
Take out water-cooled；
(8) part processing and other concerned process steps：Carried out according to particular requirement.
The determination principle of process above is as follows：
Smelt：High temperature wear resistant pressure vessel structural alloy steel typically uses electric furnace+electric slag refusion and smelting method, obtains
While metallurgical quality higher is with proof strength, with enough toughness.The applicable steel grade of the present invention is the alloys such as Cr, Mo unit
Cellulose content structural alloy steel higher, it is necessary to improve metallurgical quality and just can guarantee that toughness, therefore need to carry out stove after electric furnace smelting
Outer refining, then carries out electroslag furnace under protective Ar gas refusion and smelting again.
Forging/rolling and annealing：The alloying element content of the steel grade is higher, and quenching degree is good, thus can be used to manufacture compared with
Heavy in section bar, but it also is adapted for the smaller specification bar of manufacture.Because carbon content is relatively low with respect to other medium carbon structural alloy steels, high temperature
Preferably, forging and rolling temperature interval are slightly higher for plasticity.The Ac of the steel3Point temperature is at 860 DEG C or so, therefore final forging temperature can not be low
In 880 DEG C.Meanwhile, the Ac of the steel1Point temperature has overcooling austenite stable region at 700 DEG C or so between 450~600 DEG C
Between, therefore the annealing temperature for using should be close to 700 DEG C.
Normalizing and annealing temperature：The purpose of normalizing is organized to obtain homogenization, and carbide fully dissolves.Consider
To in steel of the present invention containing carbide formers such as more Cr, Mo, carbide could significantly dissolve at 1100 DEG C.Therefore,
Normalizing temperature is optimal with 1125 ± 25 DEG C.The purpose of normalizing after annealing is to control Carbide Precipitation, with 650-700 DEG C for most
It is good.
Hardening heat：The Ac of the applicable structural alloy steel of the present invention3Point temperature at 860 DEG C or so, by usually requiring that quenching
Temperature is in Ac3+ 30~50 DEG C of calculating, the hardening heat of the steel should be at 890~910 DEG C or so.Therefore, hardening heat with 900 ±
20 DEG C is optimal.
Temperature：Tempering purpose is that the purpose of second tempering is adjustment in order to reduce hardness so as to alignment for the first time
Final performance.The characteristics of secondary hardened steel is：When temperature is near post-curing peak temperature, intensity and hardness compared with
Height, but toughness is relatively low；When a little higher than post-curing peak temperature is tempered, hardness and intensity are reduced rapidly, and toughness rises rapidly
It is high.The post-curing peak temperature of the applicable structural alloy steel of the present invention is at 580 DEG C or so, therefore the final temperature selected
It is 640 ± 20 DEG C.The too high then intensity decreases of temperature are too many, and temperature is too low, and toughness not yet reaches most preferably.
Mechanical property meets after heat treatment：Normal temperature hardness is HRC28~38,600 DEG C of nominal-ultimate strength (σ0.2) be not less than
550MPa, -40 DEG C of Low temperature impact toughness (keyhole) are not less than 25J/cm2, Room-Temperature Fracture Toughness is not less than 150MPa m1/2。
The present invention smelts and Technology for Heating Processing by the way that selection is suitable, can play excellent high temperatures of the structural alloy steel
Energy and low cycle fatigue property.Compared with existing 40CrNi3MoV steel and its production technology, with advantages below：
1. elevated temperature strength is significantly improved.
The general temperature of 40CrNi3MoV steel is at 600 DEG C or so, and the temperature of steel heat treatment process of the present invention exists
More than 620 DEG C, illustrate that the anti-temper softening ability of steel of the present invention is stronger, thus its high-temperature behavior is also higher.Carbon in steel of the present invention
Compound is with M2Based on C, and carbide of the 40CrNi3MoV steel in use state is with M3Based on C, M2The High-Temperature Strengthening of C carbide
Effect is significantly better than M3C carbide, thus the elevated temperature strength of steel of the present invention is higher.Especially because employing 1100-1150 DEG C
+ 650-700 DEG C of annealing of high temperature normalizing, separates out substantial amounts of carbide, then still have the thicker carbide in part to protect through 900 DEG C or so
Stay, be conducive to improving high temperature hardness and wearability.
2. low cycle fatigue property is improved.
The yield tensile ratio of the body tube steel such as 40CrNi3MoV is (typically more than 0.9) higher, is followed in the presence of cyclic loading
It is serious that ring softens tendency.After steel of the present invention and Technology for Heating Processing treatment, its yield tensile ratio is slightly lower (typically 0.85 or so), although
Also there is cyclic softening in the presence of cyclic loading, but it softens tendency and can not show a candle to 40CrNi3MoV steel.In addition, steel tool of the present invention
There is fatigue ductility index higher, and the tired transition life-span is also higher.
3. fracture toughness is high
The Room-Temperature Fracture Toughness of 40CrNi3MoV steel is general in 100-120MPa m1/2, because carbon content is low in matrix, this
Invention steel Room-Temperature Fracture Toughness is in 150MPa m1/2More than.
Specific embodiment
Using 30 tons of electric furnace+external refinings+electroslag furnace under protective Ar gas remelting method smelting process, the examination of steel of the present invention has been carried out
System, embodiment composition is shown in Table 1.Billet diameter after electroslag remelting is 480mm, the heated circle for being forged into a diameter of 40-90mm
Rod, then through 700 DEG C annealing 8h after, carried out different heat treatment system treatment, be designated as respectively according to heat treating regime embodiment 1~
6.Carry out the items mechanical property such as hardness, fracture toughness, low-temperature impact, drawing by high temperature and low-cycle fatigue respectively by national standard
Test, and its mechanical property is contrasted with 40CrNi3MoV steel.The chemical composition of test specimen is listed in table 1, heat treatment system
Degree is listed in table 2, hardness, intensity, impact toughness and fracture toughness etc. and is listed in table 3, and low cycle fatigue property is listed in table 4.Embodiment
40CrNi3MoV steel of the comprehensive mechanical property apparently higher than contrast.
The chemical composition (wt%) of the embodiment steel of table 1 and compared steel 40CrNi3MoV
| Element | Embodiment steel | 40CrNi3MoV |
| C | 0.25 | 0.40 |
| Si | 0.15 | 0.25 |
| Mn | 0.20 | 0.40 |
| P | 0.005 | 0.012 |
| S | 0.001 | 0.001 |
| Cr | 3.00 | 1.28 |
| Mo | 2.95 | 0.38 |
| Ni | 0.95 | 3.16 |
| Nb | 0.10 | - |
| V | - | 0.20 |
| RE | 0.0025 | - |
| [O] | 0.0018 | 0.0025 |
| [N] | 0.0075 | 0.0092 |
| Fe | It is remaining | It is remaining |
The Technology for Heating Processing of the embodiment steel of table 2 and compared steel 40CrNi3MoV
The conventional mechanical property of the embodiment steel of table 3 and compared steel 40CrNi3MoV
The low cycle fatigue property of the embodiment steel of table 4 and compared steel 40CrNi3MoV
Claims (2)
1. a kind of high-temperature alloy structural steel, it is characterised in that chemical component weight % is as follows：C：0.23~0.27%, Si：≤
0.20%, Mn：≤ 0.20%, P：≤ 0.008%, S：≤ 0.003%, Cr：2.85~3.05%, Mo：2.85~3.05%,
Ni：0.80~1.0%, Nb：0.09~0.11%, V：≤ 0.20%, [O]：≤ 0.0020%, [N]：≤ 0.0080%, RE：
0.0015~0.0035%, balance of Fe.
2. the high-temperature alloy structure steel heat treatment process described in a kind of claim 1, it is characterised in that technological process and control
Technical parameter it is as follows：
(1) smelt：Using electric furnace+external refining+electric slag refusion and smelting；
(2) forging/rolling：Forge or be rolled into the bar of below Φ 150mm；Heating-up temperature is opened between 1180~1200 DEG C
At 1160~1180 DEG C, final forging temperature is not less than 880 DEG C to forging temperature；
(3) anneal：More than 8h (the longer the better) is incubated in annealing furnace between in temperature being 670~750 DEG C, then with not higher than
The cooling rate of 40 DEG C/h is cooled to less than 500 DEG C, takes out air cooling；
(4) normalizing：After being incubated 1-10h at 1125 ± 25 DEG C, air cooling is taken out；
(5) anneal：After being incubated 2-20h at 675 ± 25 DEG C, air cooling is taken out；
(6) quench：After being incubated 1-3h at 900 ± 20 DEG C, water quenching or oil quenching are taken out；
(7) it is tempered：After protecting 2-5h at 620 ± 20 DEG C, air cooling is taken out；After being incubated 2-5h at 640 ± 20 DEG C again after alignment, water is taken out
It is cold.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108486349A (en) * | 2018-05-09 | 2018-09-04 | 合肥汇之新机械科技有限公司 | A kind of heat treatment process of twist bit alloy tool steel bit |
| CN109038402A (en) * | 2018-08-16 | 2018-12-18 | 镇江朝阳机电科技有限公司 | A kind of tray type cable bridge and preparation method thereof |
| CN111534762A (en) * | 2020-06-12 | 2020-08-14 | 铁科（北京）轨道装备技术有限公司 | Wear-resistant steel and heat treatment process and preparation method thereof |
| CN111676428A (en) * | 2020-07-27 | 2020-09-18 | 中国兵器工业第五九研究所 | High-temperature-resistant medium-low carbon medium-low alloy steel and preparation method thereof |
| CN113462951A (en) * | 2021-06-29 | 2021-10-01 | 钢铁研究总院 | Preparation method of ultrahigh-strength and high-toughness alloy steel |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108486349A (en) * | 2018-05-09 | 2018-09-04 | 合肥汇之新机械科技有限公司 | A kind of heat treatment process of twist bit alloy tool steel bit |
| CN109038402A (en) * | 2018-08-16 | 2018-12-18 | 镇江朝阳机电科技有限公司 | A kind of tray type cable bridge and preparation method thereof |
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| CN111676428A (en) * | 2020-07-27 | 2020-09-18 | 中国兵器工业第五九研究所 | High-temperature-resistant medium-low carbon medium-low alloy steel and preparation method thereof |
| CN111676428B (en) * | 2020-07-27 | 2021-11-02 | 中国兵器工业第五九研究所 | High-temperature-resistant medium-low carbon medium-low alloy steel and preparation method thereof |
| CN113462951A (en) * | 2021-06-29 | 2021-10-01 | 钢铁研究总院 | Preparation method of ultrahigh-strength and high-toughness alloy steel |
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| CN106756509B (en) | 2018-03-27 |
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