CN106834929A - Corrosion-resistant cast steel and its Technology for Heating Processing under a kind of environment suitable for atmospheric corrosion - Google Patents

Corrosion-resistant cast steel and its Technology for Heating Processing under a kind of environment suitable for atmospheric corrosion Download PDF

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Publication number
CN106834929A
CN106834929A CN201710125089.8A CN201710125089A CN106834929A CN 106834929 A CN106834929 A CN 106834929A CN 201710125089 A CN201710125089 A CN 201710125089A CN 106834929 A CN106834929 A CN 106834929A
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corrosion
cast steel
resistant cast
environment suitable
technology
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Inventor
郭勇
王红续
宫小能
吉杏斗
张岭
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Hengshui Yu Changzhuduan Co Ltd
Hengshui Zhongtiejian Engineering Rubber Co Ltd
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Hengshui Yu Changzhuduan Co Ltd
Hengshui Zhongtiejian Engineering Rubber Co Ltd
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Priority to CN201710125089.8A priority Critical patent/CN106834929A/en
Publication of CN106834929A publication Critical patent/CN106834929A/en
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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
    • C21D1/25—Hardening, combined with annealing between 300 degrees Celsius and 600 degrees Celsius, i.e. heat refining ("Vergüten")
    • 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
    • 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
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/005—Heat treatment of ferrous alloys containing Mn
    • 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
    • C21D6/008—Heat treatment of ferrous alloys containing Si
    • 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
    • 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
    • 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
    • C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
    • 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
    • C21D2211/005—Ferrite
    • 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
    • C21D2211/009—Pearlite

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Heat Treatment Of Steel (AREA)
  • Heat Treatment Of Articles (AREA)

Abstract

The present invention relates to the corrosion-resistant cast steel under low-alloy cast steel and technical field of heat treatment, more particularly to a kind of environment suitable for atmospheric corrosion, the composition of corrosion-resistant cast steel includes by weight percentage：C：0.08%~0.16%, Si：0.20%~0.60%, Mn：0.4%~1.5%, P≤0.030%, S≤0.030%, Cr：0.20%~0.60%, Ni：0.20%~0.60%, Cu：0.20%~0.50%, balance of Fe and inevitable impurity element.Meanwhile, the present invention also provides a kind of Technology for Heating Processing of the corrosion-resistant cast steel under environment suitable for atmospheric corrosion.Beneficial effects of the present invention are：By regulate and control each composition in corrosion-resistant cast steel with when disposable cast shaping process and Technology for Heating Processing, effectively increase the decay resistance of cast steel, meanwhile, its mechanical property reaches：Yield strength >=270MPa, tensile strength >=500MPa, elongation >=18%, the contraction percentage of area >=40%, normal temperature impact property >=40J.

Description

Corrosion-resistant cast steel and its Technology for Heating Processing under a kind of environment suitable for atmospheric corrosion
Technical field
It is applied to atmospheric corrosion environment the present invention relates to low-alloy cast steel and technical field of heat treatment, more particularly to one kind Under corrosion-resistant cast steel and its Technology for Heating Processing.
Background technology
For a long time, such as anti-corrosion of railway, vehicle, bridge, pylon etc. of the steel construction in atmospheric corrosion environment and lengthen the life standby It is concerned, and weathering steel is used widely because of its good atmospheric corrosion resistance.But the life of commonly used weathering steel Product mode is continuous casting and rolling, for having special shape and the poor structure weathering steel of welding performance, is difficult to using continuous casting and rolling Meet needs, and the report research in industry to casting weathering steel is very few.
Application number：201511009728.1, denomination of invention：A kind of corrosion resistant bridge bearing steel suitable for marine environment Middle illustrated corrosion resistant bridge bearing steel, it is intended to suitable for marine environment, therefore in its corrosion resistant bridge bearing steel Alloy content is high, and composition proportion is difficult, and cost is higher；In application number：200510045624.6, denomination of invention：It is a kind of The weathering steel illustrated in economy type weathering-resistant steel, although weathering steel can be prepared, but because its mode of production is rolling, rather than Casting；In application number：201510604741.5, denomination of invention：The weather-proof bridle iron illustrated in bridge weathering steel bearing, is to use Weatherproof structure steel is processed, be not one-step casting shaping, the above method prepare weathering steel cannot meet special shape and The structure weathering steel of welding performance difference.
In order to solve the above problems, and for the characteristic of weathering steel, the present invention proposes a kind of suitable for atmospheric corrosion environment Under corrosion-resistant cast steel and its Technology for Heating Processing, by regulate and control each composition in corrosion-resistant cast steel with when disposable casting Carry out Technology for Heating Processing again afterwards, effectively increase the atmospheric corrosion resistance of cast steel, while effectively increasing the mechanical property of cast steel Energy.
The content of the invention
Object of the present invention is to provide the corrosion-resistant cast steel under a kind of environment suitable for atmospheric corrosion and its heat treatment Technique, by regulating and controlling corrosion-resistant cast steel each composition with when disposable casting after carry out Technology for Heating Processing again, effectively The decay resistance of cast steel is improve, meanwhile, its mechanical property reaches：Yield strength >=270MPa, tensile strength >=500MPa, Elongation >=18%, the contraction percentage of area >=40%, normal temperature impact property >=40J.
The technical scheme is that：
A kind of corrosion-resistant cast steel under environment suitable for atmospheric corrosion, the composition of the corrosion-resistant cast steel is with percentage by weight Meter includes：C：0.08%~0.16%, Si：0.20%~0.60%, Mn：0.4%~1.5%, P≤0.030%, S≤ 0.030%, Cr：0.20%~0.60%, Ni：0.20%~0.60%, Cu：0.20%~0.50%, balance of Fe and can not The impurity element for avoiding.
Composition to the corrosion-resistant cast steel is illustrated：
C：The too low hardness of steel of C content can be relatively low, and C content is too high to influence the decay resistance of steel, therefore C of the invention Content control exists：0.08%~0.16%；
Si：Si can improve the corrosion resistance under steel natural conditions, while Si can also carry out deoxidation to steel, but Si is too high to be led Steel weldability is caused to be deteriorated, therefore Si contents control range of the present invention：0.20%~0.60%.
Mn：With stronger solution strengthening effect, the intensity and hardness of steel can be improved, improve the hot-working character of steel, In steelmaking process, Mn is good deoxidier and desulfurizing agent, and the synergy that Mn and Cu is combined addition can improve the corrosion resistant of steel Corrosion energy, but Mn amounts are too high, can weaken the resistance to corrosion of steel, reduce Mn in the toughness and welding performance, therefore the present invention of steel Content control range：0.4%~1.5%.
P：P can improve the decay resistance of steel, but the mechanical property of influence steel, P content scope of the present invention：≤ 0.030%.
S：S is often considered as impurity element, S content ranges in the present invention in steel：≤ 0.030%.
Cr：Cr can both improve the quenching degree of steel, so as to improve the intensity of weather-proof cast steel, impact property, can effectively carry again The atmospheric corrosion resistance of Gao Gang, Cr contents are too low not to work to cast steel characteristic, Cr too high levels can dramatically increase steel into This, therefore, Cr contents of the invention should be limited to 0.20%~0.60%.
Ni：Ni is the advantageous elements of the corrosion resistance and obdurability for improving steel, and content is too low to have little effect, and too high levels are then The cost of steel can be significantly improved, therefore Ni contents of the invention control exists：0.20%~0.60%.
Cu：Cu is to improve the alloying element that steel decay resistance is main, most commonly use, but Cu elements are less than Corrosion-resistant effect is not obvious when 0.2%；During Cu too high levels then easily crystal boundary produce enrichment, therefore its content no more than 0.50%, the content for further improving Cu is not only little to weatherability contribution, and copper brittleness is easily caused on the contrary, and Cu's contains in the present invention Measuring scope is：0.20%~0.50%.
Further, the composition of the corrosion-resistant cast steel includes by weight percentage：C：0.09%~0.11%, Si： 0.34%~0.49%, Mn：0.52%~0.67%, P≤0.025%, S≤0.023%, Cr：0.27%~0.38%, Ni： 0.23%~0.28%, Cu：0.22%~0.35%, balance of Fe and inevitable impurity element.
Further, the composition of the corrosion-resistant cast steel includes by weight percentage：C：0.125%~0.153%, Si：0.51%~0.58%, Mn：0.73%~1.44%, P≤0.021%, S≤0.019%, Cr：0.41%~0.57%, Ni：0.31%~0.52%, Cu：0.41%~0.48%, balance of Fe and inevitable impurity element.
A kind of Technology for Heating Processing of the corrosion-resistant cast steel under environment suitable for atmospheric corrosion, mainly includes：Disposable casting Normalizing or Tempering and Quenching are carried out after shaping again.
The present invention carries out normalizing or Tempering and Quenching again after using disposable casting, using disposable casting, Can be made into complex-shaped casting, the shape of made casting, size and part closely, reduce the work of machining Measure, a large amount of metal materials can be saved.
Further, the normalizing heat treatment technique is：In heating furnace 850 DEG C~960 DEG C, insulation are heated to from room temperature 3.0~6.0h, is then air cooled to room temperature.
Further, 873 DEG C~912 DEG C are heated to from room temperature in heating furnace, are incubated 3.8h~4.6h.
Further, the microstructure of the corrosion-resistant cast steel is ferrite and pearlite, and the ferrite content is 8% ~18.7%, content of pearlite in alloy accounts for 81.3%~92%.
It is heat-treated using normalizing, crystal grain refinement can be made, intensity is improved, improves processing characteristics, using being disposably cast as Normalizing heat treatment is carried out after type again, i.e., is heat-treated using normalizing as at final heat on the premise of mechanical castings are ensured Reason, can be with energy saving, improve production efficiency.
Further, the quenching-and-tempering process is concretely comprised the following steps：
Step 1, hardening heat are 850 DEG C~960 DEG C, and soaking time is then entered according to casting thickness by 1.2~1.5min/mm Row is calculated, water-cooled to room temperature；
Step 2, temperature are 500 DEG C~720 DEG C, are incubated >=2 hours, are air cooled to room temperature.
Further, 868 DEG C~937 DEG C of hardening heat in the step 1, soaking time then presses 1.27 according to casting thickness ~1.38min/mm is calculated；Temperature is 576 DEG C~605 DEG C in the step 2, is incubated >=3.4 hours.
Further, the microstructure of the corrosion-resistant cast steel is tempered sorbite, and the tempered sorbite includes iron element Body and particulate globular cementite, the ferrite content are 97.9%~99.1%, and the content range of the particulate globular cementite is 0.9%~2.1%.
The present invention carries out Tempering and Quenching again using after disposable casting, can obtain returning for high intensity and high tenacity Fiery sorbite tissue, prepared casting has excellent comprehensive mechanical property.
The invention has the advantages that：
1) the corrosion-resistant cast steel and its Technology for Heating Processing under a kind of environment suitable for atmospheric corrosion of the present invention, prepared is resistance to The mechanical property for corroding cast steel can reach values below：Yield strength >=270MPa, tensile strength >=500MPa, elongation >= 18%, the contraction percentage of area >=40%, normal temperature impact property >=40J；
2) the corrosion-resistant cast steel and its Technology for Heating Processing under a kind of environment suitable for atmospheric corrosion of the present invention, corrosion-resistant casting , by casting, compared with roll forming, advantage is can straight forming, the shape of made casting, size and part for steel Closely, the workload with steel billet machining and welding is reduced, a large amount of metal materials can be saved；
3) the corrosion-resistant cast steel and its Technology for Heating Processing under a kind of environment suitable for atmospheric corrosion of the present invention, prepared is resistance to Corrode the fine corrosion resistance of cast steel；
4) the corrosion-resistant cast steel and its Technology for Heating Processing under a kind of environment suitable for atmospheric corrosion of the present invention, had both reduced resistance to Corrode the cost of cast steel, engineering can be met again to the need for the decay resistance and mechanical property of cast steel material.
Specific embodiment
The present invention provides corrosion-resistant cast steel and its Technology for Heating Processing under a kind of environment suitable for atmospheric corrosion, of the invention Chemical composition is as shown in table 1：
The chemical composition of the invention (wt%) of table 1
C Si Mn P、S Cr Ni Cu
0.08~0.16 0.20~0.60 0.40~1.50 ≤0.030 0.20~0.60 0.20~0.60 0.20~0.50
Following examples are only used for explaining and illustrating the preferred embodiments of the present invention, do not constitute to technical solution of the present invention Limitation.
Table 2 is the chemical composition of comparative example of the invention and specific embodiment, and the mechanical property of the steel prepared by table 2 is shown in Table 3, Technology for Heating Processing is shown in Table 4.
The chemical composition (wt%) of the comparative example of table 2 and embodiment
C Si Mn P S Cr Ni Cu
0.30 0.27 0.87 0.021 0.013 0.03 0.03 0.01 Comparative example
0.08 0.30 1.32 0.025 0.014 0.55 0.24 0.42 Embodiment 1
0.12 0.21 1.01 0.022 0.017 0.43 0.37 0.41 Embodiment 2
0.15 0.35 1.27 0.022 0.010 0.51 0.48 0.32 Embodiment 3
0.14 0.41 0.55 0.017 0.015 0.25 0.51 0.48 Embodiment 4
0.10 0.55 0.84 0.016 0.020 0.36 0.38 0.21 Embodiment 5
0.08 0.36 0.88 0.010 0.025 0.34 0.25 0.29 Embodiment 6
0.13 0.47 0.95 0.023 0.021 0.44 0.26 0.24 Embodiment 7
0.09 0.25 0.79 0.024 0.016 0.46 0.42 0.36 Embodiment 8
0.11 0.48 1.20 0.022 0.019 0.51 0.56 0.34 Embodiment 9
The mechanical property of the comparative example of table 3 and embodiment
As can be seen from Table 3, the mechanical property of the embodiment of the present invention can reach values below：Yield strength >=270MPa, resists Tensile strength >=500MPa, elongation >=18%, the contraction percentage of area >=40%, normal temperature impact property >=40J.
The Technology for Heating Processing of the comparative example of table 4 and embodiment
Heating Cooling
Comparative example (1) 930 DEG C is incubated 4 hours (2) it is air cooled to room temperature
Embodiment 1 (1) 950 DEG C is incubated 5 hours (2) 100 DEG C/h is cooled to 500 DEG C, air cooling to room temperature
Embodiment 2 (1) 910 DEG C is incubated 3 hours (2) air cooling is to room temperature
Embodiment 3 (1) 870 DEG C is incubated 4 hours (2) 100 DEG C/h is cooled to 500 DEG C, air cooling to room temperature
Embodiment 4 5 hours+water-cooled of (1) 920 DEG C of insulation (2) 700 DEG C are incubated 5 hours+air coolings to room temperature
Embodiment 5 6 hours+water-cooled of (1) 880 DEG C of insulation (2) 580 DEG C are incubated 6 hours+air coolings to room temperature
Embodiment 6 (1) 850 DEG C is incubated 6 hours (2) air cooling is to room temperature
Embodiment 7 (1) 910 DEG C is incubated 5 hours (2) 100 DEG C/h is cooled to 500 DEG C, air cooling to room temperature
Embodiment 8 3 hours+water-cooled of (1) 880 DEG C of insulation (2) 550 DEG C are incubated 4 hours+air coolings to room temperature
Embodiment 9 (1) 940 DEG C is incubated 5 hours (2) air cooling is to room temperature
In above-described embodiment, first using disposable casting, then normalizing or Tempering and Quenching are carried out, because using one Secondary property casting, can prepare the casting of variously-shaped complexity, and the shape of prepared casting, size and part connect very much Closely, the workload of machining is reduced, a large amount of metal materials can be saved.Embodiment 1,3~5,7,8 is heat-treated work using normalizing Skill, the microstructure of prepared cast steel is ferrite and pearlite, and wherein ferrite content accounts for 8%~18.7%, pearlite Content accounts for 81.3%~92%, and normalizing heat treatment can make crystal grain refinement, improve intensity, improves processing characteristics, ensure casting Mechanical property.Embodiment 2,6,9 uses quenching-and-tempering process, and the microstructure of prepared cast steel is tempered sorbite, its Middle tempered sorbite includes ferrite and particulate globular cementite, and the ferrite content is 97.9%~99.1%, the particulate The content range of globular cementite is 0.9%~2.1%, is had using the obtained tempered sorbite tissue of modulation heat treatment high-strength Degree and high tenacity, casting have excellent comprehensive mechanical property.
By the steel in the steel and comparative example of 1~embodiment of above-described embodiment 9 according to YB/T 4367-2014《Reinforcing bar chlorine from Corrosion tests in subenvironment》Week leaching accelerated corrosion tests are carried out, experiment condition is：Cut the examination that a diameter of a, length are b Sample etching time in corrosive medium is 72h, and corrosive medium is 2%NaCl solution, and relative humidity is 70 ± 10RH, and temperature is 45 DEG C ± 2 DEG C, between 6.5-7.5, the test period is 60min ± 5min to PH, wherein infiltration 12min ± 2min；Then according to Lower computing formula calculates average corrosion rate：
W=(w0- wt)×106/[πabt]
In formula：W is corrosion rate, g/m2·h；wtWeight after being eliminated rust for the sample corrosion t times, g；w0For sample corrodes Preceding weight, g；A, b are respectively the diameter and length , ㎜ of sample；T is test period, h.
Various embodiments of the present invention are as shown in table 6 with the decay resistance comparative result of compared steel, as seen from Table 6 the present invention The decay resistance of steel be significantly better than compared steel.
Average corrosion rate (the g/m that each embodiment of table 6 is tested with the leaching accelerated corrosion of comparative example week2·h)
In sum, corrosion-resistant cast steel and its heat treatment work under a kind of environment suitable for atmospheric corrosion that the present invention is provided Skill, carries out Technology for Heating Processing again after regulating and controlling composition proportion and disposable casting, it is ensured that prepared corrosion-resistant cast steel Atmospheric corrosion resistance, while mechanical property can reach values below：Yield strength >=270MPa, tensile strength >=500MPa, stretches Rate >=18% long, the contraction percentage of area >=40%, normal temperature impact property >=40J had both reduced the cost of corrosion-resistant cast steel, and can be full Sufficient engineering is to the need for the decay resistance and mechanical property of cast steel material.
The above, the only present invention preferably specific embodiment, but protection scope of the present invention is not limited thereto, Any one skilled in the art the invention discloses technical scope in, the change or replacement that can be readily occurred in, Should all be included within the scope of the present invention.

Claims (10)

1. the corrosion-resistant cast steel under a kind of environment suitable for atmospheric corrosion, it is characterised in that the composition of the corrosion-resistant cast steel with Percentage by weight meter includes：C：0.08%~0.16%, Si：0.20%~0.60%, Mn：0.4%~1.5%, P≤ 0.030%, S≤0.030%, Cr：0.20%~0.60%, Ni：0.20%~0.60%, Cu：0.20%~0.50%, surplus It is Fe and inevitable impurity element.
2. the corrosion-resistant cast steel under a kind of environment suitable for atmospheric corrosion according to claim 1, it is characterised in that described The composition of corrosion-resistant cast steel includes by weight percentage：C：0.09%~0.11%, Si：0.34%~0.49%, Mn： 0.52%~0.67%, P≤0.025%, S≤0.023%, Cr：0.27%~0.38%, Ni：0.23%~0.28%, Cu： 0.22%~0.35%, balance of Fe and inevitable impurity element.
3. the corrosion-resistant cast steel under a kind of environment suitable for atmospheric corrosion according to claim 1, it is characterised in that described The composition of corrosion-resistant cast steel includes by weight percentage：C：0.125%~0.153%, Si：0.51%~0.58%, Mn： 0.73%~1.44%, P≤0.021%, S≤0.019%, Cr：0.41%~0.57%, Ni：0.31%~0.52%, Cu： 0.41%~0.48%, balance of Fe and inevitable impurity element.
4. the corrosion-resistant casting Heat-Treatment of Steel work under a kind of environment suitable for atmospheric corrosion according to claim 1 or 2 or 3 Skill, it is characterised in that mainly include：Normalizing or Tempering and Quenching are carried out again after disposable casting.
5. the Technology for Heating Processing of the corrosion-resistant cast steel under a kind of environment suitable for atmospheric corrosion according to claim 4, its It is characterised by, the normalizing heat treatment technique is：In heating furnace 850 DEG C~960 DEG C are heated to from room temperature, insulation 3.0h~ 6.0h, is then air cooled to room temperature.
6. the Technology for Heating Processing of the corrosion-resistant cast steel under a kind of environment suitable for atmospheric corrosion according to claim 5, its It is characterised by, 873 DEG C~912 DEG C is heated to from room temperature in heating furnace, is incubated 3.8h~4.6h.
7. the Technology for Heating Processing of the corrosion-resistant cast steel under a kind of environment suitable for atmospheric corrosion according to claim 4 or 5, Characterized in that, the microstructure of the corrosion-resistant cast steel be ferrite and pearlite, the ferrite content be 8%~ 18.7%, content of pearlite in alloy accounts for 81.3%~92%.
8. the Technology for Heating Processing of the corrosion-resistant cast steel under a kind of environment suitable for atmospheric corrosion according to claim 4, its It is characterised by, the quenching-and-tempering process is concretely comprised the following steps：
Step 1, hardening heat are 850 DEG C~960 DEG C, based on soaking time is then carried out by 1.2~1.5min/mm according to casting thickness Calculate, water-cooled to room temperature；
Step 2, temperature are 500 DEG C~720 DEG C, are incubated >=2 hours, are air cooled to room temperature.
9. the Technology for Heating Processing of the corrosion-resistant cast steel under a kind of environment suitable for atmospheric corrosion according to claim 8, its Be characterised by, 868 DEG C~937 DEG C of hardening heat in the step 1, soaking time then according to casting thickness by 1.27~ 1.38min/mm is calculated；Temperature is 576 DEG C~605 DEG C in the step 2, is incubated >=3.4 hours.
10. the corrosion-resistant casting Heat-Treatment of Steel work under a kind of environment suitable for atmospheric corrosion according to claim 8 or claim 9 Skill, it is characterised in that the microstructure of the corrosion-resistant cast steel be tempered sorbite, the tempered sorbite include ferrite and Particulate globular cementite, the ferrite content is 97.9%~99.1%, and the content range of the particulate globular cementite is 0.9% ~2.1%.
CN201710125089.8A 2017-03-03 2017-03-03 Corrosion-resistant cast steel and its Technology for Heating Processing under a kind of environment suitable for atmospheric corrosion Pending CN106834929A (en)

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CN113151733A (en) * 2020-12-31 2021-07-23 天瑞集团铸造有限公司 High-strength high-toughness cold-resistant wear-resistant cast steel and preparation method thereof
CN113614267A (en) * 2019-03-29 2021-11-05 宝马股份公司 Steel alloy, use and component of such a steel alloy
CN115109997A (en) * 2022-06-16 2022-09-27 中船双瑞(洛阳)特种装备股份有限公司 Acid rain atmospheric corrosion resistant weather-resistant cast steel
CN116987954A (en) * 2023-08-09 2023-11-03 常熟市龙腾特种钢有限公司 High-strength and high-toughness flat-bulb steel and preparation method thereof

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113614267A (en) * 2019-03-29 2021-11-05 宝马股份公司 Steel alloy, use and component of such a steel alloy
CN113151733A (en) * 2020-12-31 2021-07-23 天瑞集团铸造有限公司 High-strength high-toughness cold-resistant wear-resistant cast steel and preparation method thereof
CN115109997A (en) * 2022-06-16 2022-09-27 中船双瑞(洛阳)特种装备股份有限公司 Acid rain atmospheric corrosion resistant weather-resistant cast steel
CN115109997B (en) * 2022-06-16 2023-11-03 中船双瑞(洛阳)特种装备股份有限公司 Weather-resistant cast steel resistant to acid rain atmospheric corrosion
CN116987954A (en) * 2023-08-09 2023-11-03 常熟市龙腾特种钢有限公司 High-strength and high-toughness flat-bulb steel and preparation method thereof
CN116987954B (en) * 2023-08-09 2024-02-06 常熟市龙腾特种钢有限公司 High-strength and high-toughness flat-bulb steel and preparation method thereof

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