CN107760983A - A kind of production method of low-alloy super-strength steel and its casting - Google Patents
A kind of production method of low-alloy super-strength steel and its casting Download PDFInfo
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- CN107760983A CN107760983A CN201610679441.8A CN201610679441A CN107760983A CN 107760983 A CN107760983 A CN 107760983A CN 201610679441 A CN201610679441 A CN 201610679441A CN 107760983 A CN107760983 A CN 107760983A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 39
- 239000010959 steel Substances 0.000 title claims abstract description 39
- 238000005266 casting Methods 0.000 title claims abstract description 33
- 229910045601 alloy Inorganic materials 0.000 title claims abstract description 31
- 239000000956 alloy Substances 0.000 title claims abstract description 31
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 18
- 238000010438 heat treatment Methods 0.000 claims abstract description 12
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 10
- 238000012545 processing Methods 0.000 claims abstract description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 36
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 22
- 238000002844 melting Methods 0.000 claims description 20
- 230000008018 melting Effects 0.000 claims description 20
- 229910052742 iron Inorganic materials 0.000 claims description 17
- 238000005496 tempering Methods 0.000 claims description 16
- 238000010791 quenching Methods 0.000 claims description 13
- 230000000171 quenching effect Effects 0.000 claims description 13
- 239000010949 copper Substances 0.000 claims description 10
- 229910052759 nickel Inorganic materials 0.000 claims description 9
- 239000010955 niobium Substances 0.000 claims description 9
- 239000010936 titanium Substances 0.000 claims description 9
- 239000000203 mixture Substances 0.000 claims description 8
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 6
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 claims description 6
- 229910052802 copper Inorganic materials 0.000 claims description 6
- 239000010436 fluorite Substances 0.000 claims description 6
- 238000007670 refining Methods 0.000 claims description 6
- 239000012535 impurity Substances 0.000 claims description 5
- 238000012360 testing method Methods 0.000 claims description 5
- 229910000592 Ferroniobium Inorganic materials 0.000 claims description 4
- 229910000519 Ferrosilicon Inorganic materials 0.000 claims description 4
- 229910000805 Pig iron Inorganic materials 0.000 claims description 4
- ZFGFKQDDQUAJQP-UHFFFAOYSA-N iron niobium Chemical compound [Fe].[Fe].[Nb] ZFGFKQDDQUAJQP-UHFFFAOYSA-N 0.000 claims description 4
- PNXOJQQRXBVKEX-UHFFFAOYSA-N iron vanadium Chemical compound [V].[Fe] PNXOJQQRXBVKEX-UHFFFAOYSA-N 0.000 claims description 4
- 238000000465 moulding Methods 0.000 claims description 4
- 239000011347 resin Substances 0.000 claims description 4
- 229920005989 resin Polymers 0.000 claims description 4
- 238000010079 rubber tapping Methods 0.000 claims description 4
- FBPFZTCFMRRESA-JGWLITMVSA-N D-glucitol Chemical compound OC[C@H](O)[C@@H](O)[C@H](O)[C@H](O)CO FBPFZTCFMRRESA-JGWLITMVSA-N 0.000 claims description 3
- 108010038629 Molybdoferredoxin Proteins 0.000 claims description 3
- HBELESVMOSDEOV-UHFFFAOYSA-N [Fe].[Mo] Chemical compound [Fe].[Mo] HBELESVMOSDEOV-UHFFFAOYSA-N 0.000 claims description 3
- 238000005516 engineering process Methods 0.000 claims description 3
- 230000003595 spectral effect Effects 0.000 claims description 3
- 238000001228 spectrum Methods 0.000 claims description 3
- 238000005070 sampling Methods 0.000 claims description 2
- 239000000126 substance Substances 0.000 claims description 2
- 238000003556 assay Methods 0.000 claims 1
- 239000007788 liquid Substances 0.000 claims 1
- 229910001208 Crucible steel Inorganic materials 0.000 abstract description 16
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 abstract description 7
- 239000013078 crystal Substances 0.000 abstract description 6
- 238000005275 alloying Methods 0.000 abstract description 4
- 238000002474 experimental method Methods 0.000 abstract description 4
- 229910001339 C alloy Inorganic materials 0.000 abstract description 2
- 239000000463 material Substances 0.000 description 12
- 238000000034 method Methods 0.000 description 11
- 239000011572 manganese Substances 0.000 description 10
- 239000011651 chromium Substances 0.000 description 9
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 7
- 229910052804 chromium Inorganic materials 0.000 description 7
- 238000001816 cooling Methods 0.000 description 7
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 6
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 6
- 229910001566 austenite Inorganic materials 0.000 description 6
- 229910052748 manganese Inorganic materials 0.000 description 6
- 229910052750 molybdenum Inorganic materials 0.000 description 6
- 239000011733 molybdenum Substances 0.000 description 6
- 238000002791 soaking Methods 0.000 description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 4
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 4
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 4
- 238000009413 insulation Methods 0.000 description 4
- 229910052758 niobium Inorganic materials 0.000 description 4
- 229910052698 phosphorus Inorganic materials 0.000 description 4
- 239000011574 phosphorus Substances 0.000 description 4
- 229910052710 silicon Inorganic materials 0.000 description 4
- 239000010703 silicon Substances 0.000 description 4
- 238000003723 Smelting Methods 0.000 description 3
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 3
- 239000005864 Sulphur Substances 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 230000003647 oxidation Effects 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- 229910052719 titanium Inorganic materials 0.000 description 3
- 229910052720 vanadium Inorganic materials 0.000 description 3
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 description 3
- 241000254158 Lampyridae Species 0.000 description 2
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 2
- LAUCTMALVHLLAL-UHFFFAOYSA-N [Mn].[C].[Fe] Chemical compound [Mn].[C].[Fe] LAUCTMALVHLLAL-UHFFFAOYSA-N 0.000 description 2
- 239000004411 aluminium Substances 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000003610 charcoal Substances 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000005352 clarification Methods 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000010891 electric arc Methods 0.000 description 2
- 238000007499 fusion processing Methods 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 230000033001 locomotion Effects 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000004611 spectroscopical analysis Methods 0.000 description 2
- 239000004575 stone Substances 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 241001062472 Stokellia anisodon Species 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- ALKZAGKDWUSJED-UHFFFAOYSA-N dinuclear copper ion Chemical compound [Cu].[Cu] ALKZAGKDWUSJED-UHFFFAOYSA-N 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000004952 furnace firing Methods 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000003110 molding sand Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Classifications
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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
-
- 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
- C21D1/18—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
- 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
- C22C33/06—Making ferrous alloys by melting using master alloys
-
- 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
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
-
- 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
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
-
- 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
- C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
-
- 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
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
-
- 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
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
-
- 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
- C22C38/16—Ferrous alloys, e.g. steel alloys containing copper
-
- 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
-
- 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
- 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
-
- 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
-
- 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
-
- 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
- C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Treatment Of Steel In Its Molten State (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
The present invention relates to the production method of a kind of low-alloy super-strength steel and its casting, the low-alloy cast steel is matched using low-carbon and various alloying elements, and adds higher trace niobium element, crystal grain thinning, homogenizes tissue；After heat treatment, its hardness and wearability are greatly improved, while reasonably combines its strength and toughness, makes it have good comprehensive mechanical property and processing performance；The mechanical property of low carbon alloy cast steel of the present invention is as follows：Tensile strength 1300 is to 1500Mpa, yield strength 900MPa to 1200MPa, elongation >=10%, Impact energy Ak >=40J of room temperature v-notch Charpy pendulu impact experiment, the 460HBW of Brinell hardness 390.
Description
Technical field
The present invention relates to metal smelt technical field, particularly a kind of production of low-alloy super-strength steel and its casting
Method.
Background technology
With the fast development of industry, engineering machinery just develops towards the direction in high-end forward position, and this is just to the performance of material
It is proposed higher requirement.Low-alloy cast steel has alloy content low (alloying element total amount≤5%), wide material sources, comprehensive mechanics
The features such as performance is good, manufacturing process is simple, and cost is low, it is a kind of good engineering material of application prospect.Superhigh intensity low-alloy
Cast steel not only has high intensity and high rigidity, and has good toughness and impact resistance.Patent CN20141024122.4
Disclose one kind and prepare low-alloy high-strength cast steel using electric arc furnaces, electric arc furnaces has very strong fusing, oxidation and reducing power, smelting
Gold is very capable, and composition adjustment is convenient, but arc melting is serious to the scaling loss of element, and energy consumption is big, and working environment is relatively
Difference；And the requirement in the essential industry such as Aero-Space, track traffic, national defence field can not be met.
Intermediate frequency furnace firing rate is fast, production efficiency is high, oxidation takes off few charcoal, saving material and cost, extends the mould longevity
Life, and intermediate frequency furnace homogeneous heating, the core table temperature difference is minimum, and accuracy of temperature control is high, and working environment is superior, realizes low stain, low
Power consumption, so as to improve worker laboring environment and corporate image, meet the green production of country's proposition, be becoming of developing at present of enterprise
Gesture.Specific preparation process includes：Intermediate frequency furnace melting+quiescence in high temperature refining, then by Tempering and Quenching, obtain high temperature and return
Fiery sorbite, low-alloy super-strength cast steel is finally prepared, Aero-Space, track traffic, national defence can be widely used in
Etc. essential industry field.
The content of the invention
It is an object of the invention to provide the low-alloy that a kind of comprehensive mechanical property is superior, casting is easy, production process is few
The production method of unimach and its casting, the tensile strength of the low-alloy super-strength steel are not less than 1300 MPa.
The technical scheme is that a kind of low-alloy super-strength steel, its composition by weight percent includes：
C：0.20%~0.30%；
Si：0.50%~0.70%；
Mn：0.60%~0.80%；
Cr ：0.60%~1.10%；
Ni ：0.40%~0.65%；
Mo：0.50%~0.75%；
Nb：0.05%~0.15%；
V：0.03%~0.05%；
Ti：0.001%~0.003%；
Al：0.01%~0.03%；
Cu：0.02%~0.05%；
P≤0.010%；
S≤0.010%；
Surplus is iron and inevitable impurity.
The reasons why determining above-mentioned main chemical compositions is as follows：
Carbon：C content is too high, then can form more crisp tissue, reduces the low-temperature impact toughness of steel, in drawing process, C content compared with
High steel can form thicker carbide, so as to deteriorate its impact property；On the other hand, C content is too low, easily forms iron element
The relatively low tissue of body equal strength；Therefore to ensure the low-temperature impact toughness and weldability of steel, carbon content preferably for 0.20%~
0.30%。
Silicon：Silicon can significantly improve the elastic limit of steel, yield point and tensile strength, as the formation element of chromium equivalent,
Combined with molybdenum, chromium etc., the corrosion resistance and inoxidizability of steel can be improved, therefore silicone content is controlled 0.50% ~ 0.70%.
Manganese：Mn is weak carbide formation element, is generally solid-solubilized in steel, plays the effect of solution strengthening.Increase manganese content
The hardness of steel can be improved, but manganese content is too high, can influence the toughness of steel, therefore be preferably 0.60% ~ 0.80% by manganese content.
Chromium：Chromium is ferrite former, can significantly improve intensity, but reduce plasticity and toughness simultaneously；Therefore chromium
Content be preferably 0.60% ~ 1.10%.
Nickel：Nickel is strong austenite former, and increase nickel content is favorably improved the stability of austenite structure, can carry
The intensity of high material, and keep good plasticity and toughness；Therefore preferably 0.40% ~ 0.65%.
Molybdenum：Mo elements are solid-solubilized in steel in austenitizing, are realized carefully in cooling procedure by suppressing diffusion Interface Motion
Change final tissue；The free energy that Mo elements dissipate to diffusion interface effect of dragging is approximately 3 times of Mn elements, can by solution strengthening
To improve the strength of materials, molybdenum content is preferably controlled in as 0.50% ~ 0.75%.
Niobium:It can improve intensity with crystal grain thinning and reduction material superheated susceptivity and temper brittleness, can also improve welding
Performance, but Nb contents are higher thicker NbC can be formed in drawing process separates out, so as to reduce the low-temperature impact work of material；
Therefore the content of niobium element is preferably 0.05% ~ 0.15%.
Vanadium：V is ferritisey, reduces austenitic area strongly.The V element that high temperature is dissolved in austenite can increase steel
Quenching degree.The carbide V4C3 of V element is more stable in steel, can suppress crystal boundary movement and crystal grain is grown up；Therefore v element
Content be preferably 0.03% ~ 0.05%.
Titanium：Ti and N form TiN in high temperature, and during heating of plate blank austenitizing, TiN can suppress Austenite Grain Growth.Ti
TiC is formed in lower temperature section with C, tiny TiC particles benefits are in the low temperature impact properties for improving material.Ti content mistakes
Height, then it can form thick square TiN and separate out, material stress in stress is concentrated near TiN particles, turns into micro-crack
Forming core is grown up source, reduces the fatigue behaviour of steel plate.Therefore the content of titanium elements is preferably 0.001% ~ 0.003%.
Aluminium：Al elements form tiny AlN in high temperature and separated out, and can suppress Austenite Grain Growth, reach austenite
Crystal grain thinning, improve the toughness of steel at low temperature.The too high oxide that can cause larger Al of Al content is formed, and reduces steel plate
Low temperature impact properties, hot-working character, welding performance and machinability, thus the content of aluminium element be preferably 0.01% ~
0.03%。
Copper：Copper can improve intensity and toughness, and shortcoming is easily to be produced in hot-working hot-short, and copper content is more than 0.5% plasticity
Significantly reduce；Therefore it is preferably 0.02% ~ 0.05% by the content of copper.
Sulphur, phosphorus：Impurity element during alloy smelting.
The production method of above-mentioned low-alloy super-strength steel casting, comprises the following steps：
A, open mid-frequency melting furnace and debug, add high-purity pig iron and melted, fluorite is added after high-purity pig iron is melting down and is carried out
Slagging-off 2 times to 3 times.
B, after the completion of removing the gred, the carburant matched is added into molten iron and carries out carburetting.
C, boost source voltage is heated up to mid-frequency melting furnace, and nickel plate, chromic carbide iron, molybdenum are first added according to predetermined ratio
Iron, mid-carbon fe-mn, ferrosilicon, add fine copper, ferro-niobium, vanadium iron and stand, add fluorite and carry out slagging-off 3-5 times, remove the gred temperature
Control is at 1650 DEG C ± 10 DEG C.
D, 1700 DEG C are continuously heating to after the completion of removing the gred and is incubated standing refining, sampling carries out stokehold spectral test, according to
Spectral test result, molten steel component is adjusted, so that the alloy element component during molten steel meets meets C：0.20%~0.30%；Si：
0.50%~0.70%；Mn：0.60%~0.80%； Cr ：0.60%~1.10%；Ni ：0.40%~0.65%；Mo：0.50%~0.75%；
Nb：0.05%~0.15%；V：0.03%~0.05%；Ti：0.001%~0.003%；Al：0.01%~0.03%；Cu：0.02%~0.05%；P
≤0.010%；S≤0.010%；Requirement.
E, adjust to after meeting mentioned component demand, the tapping temperature of molten steel is controlled at 1610-1650 DEG C, will be melted
Molten steel all come out of the stove and make temperature control at 1560~1580 DEG C to ladle, thermometric, then carry out bottom pour ladle cast.
F, the casting of moulding by casting need to carry out Tempering and Quenching, be heat-treated as normalizing, quenching+high tempering, so as to
To high tempering sorbite tissue.
Further, in the step F, Technology for Heating Processing is：Normalizing temperature 50 DEG C, i.e., 880 to 910 more than Ac3 temperature
℃；Hardening heat control is at 880 to 920 DEG C, and temperature is controlled at 550 to 650 DEG C, the soaking time of each heat treatment stages
Rule of thumb formula and practical work piece size determine.
Further, in the step E, bottom pour ladle cast is carried out using resin sand sand mold, casting and molding sand are easy to after pouring into a mould
Separation, can reduce the workload of casting cleaning, and during the sand that uses can regenerate recovery and use, energy-conserving and environment-protective.
Heretofore described low-alloy cast steel is matched using low-carbon and various alloying elements, and is added higher micro
Niobium element, crystal grain thinning, homogenize tissue.After heat treatment, its hardness and wearability are greatly improved, while is reasonably combined
Its strength and toughness, make it have good comprehensive mechanical property and processing performance.Low carbon alloy cast steel of the present invention
Mechanical property is as follows：1300 ~ 1500Mpa of tensile strength, yield strength 900MPa ~ 1200MPa, elongation >=10%, room temperature V-type
Impact energy Ak >=40J, the Brinell hardness 390-460HBW of breach Charpy pendulu impact experiment.
The strong low-alloy cast steel of superelevation containing niobium of the tensile strength 1500MPa levels of the present invention not only has high intensity and height hard
Degree, and there is good toughness and impact resistance.Using intermediate frequency furnace melting+quiescence in high temperature refining, then pass through
Tempering and Quenching, acquisition microscopic structure are the sorbitic low-alloy super-strength cast steel of high tempering.Because it integrates mechanical property
Can be superior, casting is easy, and production process is few, and cost is low, can substitute superhigh intensity forged steel product, in Aero-Space, rail
It is used widely in the essential industry such as road traffic, national defence field.
Heated using intermediate frequency furnace, speed is fast, production efficiency is high, the de- charcoal of oxidation is few, saves material and cost, prolongs
Long die life, and intermediate frequency furnace homogeneous heating, the core table temperature difference is minimum, and accuracy of temperature control is high, and working environment is superior, realizes low
Pollution, low power consuming, so as to improve worker laboring environment and corporate image, meet the green production of country's proposition, be that enterprise is current
The trend of development.
Embodiment
Embodiment 1
The low-alloy super-strength steel casting manufacture of the present embodiment comprises the following steps：
The low-alloy high-strength toughness cast steel adding prepared using intermediate frequency furnace includes the raw material of following mass percent：Carbon 0.20%, manganese
0.70%th, silicon 0.45%, chromium 0.65%, nickel 0.65%, molybdenum 0.50%, niobium 0.015%, vanadium 0.05%, sulphur≤0.01%, phosphorus≤0.01%, it is remaining
Measure as iron and inevitable impurity.
With the intermediate frequency furnace melting of 150kg basic linings, each stove melting 125kg.
Fusion process：A, open mid-frequency melting furnace and debugged, the high purity iron for adding 125kg is melted；Treat high-purity
After iron dissolved clarification, add appropriate fluorite and remove the gred 3 times.
B, after slagging-off finishes, the carburant matched is added into molten iron and carries out carburetting, in the process dyke carburetting
The unexpected burning of agent, in order to avoid people and equipment are damaged.
C, boost source voltage heats up to mid-frequency melting furnace, then sequentially adds nickel plate, chromic carbide iron, molybdenum-iron, medium carbon manganese
Iron, ferrosilicon, interval about 30s is added, fine copper, ferro-niobium, vanadium iron are sequentially added after two minutes, appropriate firefly is added after standing two minutes
Stone is removed the gred again；Slagging-off 5 times, remove the gred 1650 DEG C of temperature.
D, after slagging-off finishes, 1700 DEG C of insulations is continuously heating to and stand 5 ~ 10 minutes, high temperature refinery is carried out, has refined
Into, small test block of casting, stokehold direct reading spectrometry inspection is carried out, if composition is qualified, is cast into keel block；If composition has deviation, lead to
Cross calculating, adjusting component（Circulate above-mentioned charging, slagging-off and refining process）, until spectrum is shown as division lattice next time, then
Casting.
E, casting cycle：First the molten steel that melting is completed is poured into 50kg small ladle, is then poured into using Dumpage type
In resin sand sand mold, 1630 DEG C of tapping temperature, 1580 DEG C of cast temperature（Come out of the stove to casting cycle and cool 40 ~ 50 DEG C）, a stove
Whole casting cycle 2 minutes.
F, the casting of moulding by casting need to carry out Tempering and Quenching, including normalizing temperature is 30 to 50 DEG C more than Ac3 temperature, real
Border control is at 880 to 910 DEG C, and normalizing soaking time is 60 to 90 minutes, then air cooling；Hardening heat is controlled 890 to 920
DEG C, Quenching Soaking Time is 60 to 90 minutes, then water cooling；At 550 to 600 DEG C, tempering insulation time is for temperature control
90 to 120 minutes, then air cooling.
Service check is carried out to the low-alloy super-strength cast steel being prepared, its microscopic structure is high tempering Soxhlet
Body, tensile strength 1450MPa, yield strength 1125MPa；Elongation 12%, room temperature v-notch Charpy pendulu impact experiment rush
Hit work(Ak46J, Brinell hardness 429HBW.
Embodiment 2
The low-alloy super-strength steel casting manufacture of the present embodiment comprises the following steps：
The low-alloy high-strength toughness cast steel adding prepared using intermediate frequency furnace includes the raw material of following mass percent：Carbon 0.26%, manganese
0.60%th, silicon 0.60%, chromium 0.65%, nickel 0.45%, molybdenum 0.70%, niobium 0.10%, vanadium 0.04%, sulphur≤0.01%, phosphorus≤0.01%, it is remaining
Measure as iron and inevitable impurity.
With the intermediate frequency furnace melting of 150kg basic linings, each stove melting 125kg.
Fusion process：A, open mid-frequency melting furnace and debugged, the high purity iron for adding 125kg is melted；Treat high-purity
After iron dissolved clarification, add appropriate fluorite and remove the gred 2 times.
B, after slagging-off finishes, the carburant matched is added into molten iron and carries out carburetting, in the process dyke carburetting
The unexpected burning of agent, in order to avoid people and equipment are damaged.
C, boost source voltage heats up to mid-frequency melting furnace, then sequentially adds nickel plate, chromic carbide iron, molybdenum-iron, medium carbon manganese
Iron, ferrosilicon, interval about 30s is added, fine copper, ferro-niobium, vanadium iron are sequentially added after two minutes, appropriate firefly is added after standing two minutes
Stone is removed the gred again；Slagging-off 45 times, remove the gred 1640 DEG C of temperature.
D, after slagging-off finishes, 1700 DEG C of insulations is continuously heating to and stand 5 ~ 10 minutes, high temperature refinery is carried out, has refined
Into, small test block of casting, stokehold direct reading spectrometry inspection is carried out, if composition is qualified, is cast into keel block；If composition has deviation, lead to
Cross calculating, adjusting component（Circulate above-mentioned charging, slagging-off and refining process）, until spectrum is shown as division lattice next time, then
Casting.
E, casting cycle：First the molten steel that melting is completed is poured into 50kg small ladle, is then poured into using Dumpage type
In resin sand sand mold, 1640 DEG C of tapping temperature, 1590 DEG C of cast temperature（Come out of the stove to casting cycle and cool 40 ~ 50 DEG C）, a stove
Whole casting cycle 2 minutes.
F, the casting of moulding by casting need to carry out Tempering and Quenching, including normalizing temperature is 30 to 50 DEG C more than Ac3 temperature, real
Border control is at 880 to 910 DEG C, and normalizing soaking time is 60 to 90 minutes, then air cooling；Hardening heat is controlled 890 to 920
DEG C, Quenching Soaking Time is 60 to 90 minutes, then water cooling；At 550 to 600 DEG C, tempering insulation time is for temperature control
90 to 120 minutes, then air cooling.
Service check is carried out to the low-alloy super-strength cast steel being prepared, its microscopic structure is high tempering Soxhlet
Body, tensile strength 1430MPa, yield strength 1165MPa；Elongation 12%, room temperature v-notch Charpy pendulu impact experiment rush
Hit work(Ak42J, Brinell hardness 428HBW.
The present invention provides a kind of method that low-alloy super-strength cast steel is prepared using intermediate frequency furnace, from low-sulfur phosphorus stove
Material, refined using intermediate frequency furnace smelting molten steel, quiescence in high temperature, normalizing, the Tempering and Quenching of quenching+high tempering, finally
Prepare low-alloy super-strength cast steel.This method process is few, efficiency high, the low-alloy super-strength steel intensity height of preparation, modeling
Property and good toughness, and there is higher hardness, combination property is superior.It can be used under requirement high toughness wear resistant working condition making
Workpiece, and alloying element is few, advantage of lower cost, is the development trend of current enterprise's melting superhigh intensity steel and iron parts.
Obviously, above-described embodiment is only intended to clearly illustrate example of the present invention, and is not to the present invention
The restriction of embodiment.For those of ordinary skill in the field, it can also be made on the basis of the above description
Its various forms of changes or variation.There is no necessity and possibility to exhaust all the enbodiments.And these belong to this hair
The obvious changes or variations that bright spirit is extended out is still in protection scope of the present invention.
Claims (4)
1. a kind of low-alloy super-strength steel, it is characterised in that chemical composition and its mass percent include：
C：0.20%~0.30%；
Si：0.50%~0.70%；
Mn：0.60%~0.80%；
Cr ：0.60%~1.10%；
Ni ：0.40%~0.65%；
Mo：0.50%~0.75%；
Nb：0.05%~0.15%；
V：0.03%~0.05%；
Ti：0.001%~0.003%；
Al：0.01%~0.03%；
Cu：0.02%~0.05%；
P≤0.010%；
S≤0.010%；
Surplus is iron and inevitable impurity.
2. the production method of the casting of low-alloy super-strength steel according to claim 1, it is characterised in that including as follows
Step：
A, open mid-frequency melting furnace and debug, add high-purity pig iron and melted, fluorite is added after high-purity pig iron is melting down and is carried out
Slagging-off 2 times to 3 times；
B, after the completion of removing the gred, the carburant matched is added into molten iron and carries out carburetting；
C, boost source voltage heats up to mid-frequency melting furnace, first added according to predetermined ratio nickel plate, chromic carbide iron, molybdenum-iron,
Mid-carbon fe-mn, ferrosilicon, add fine copper, ferro-niobium, vanadium iron and stand, add fluorite and carry out slagging-off 3-5 times, remove the gred temperature control
At 1650 DEG C ± 10 DEG C；
D, 1700 DEG C are continuously heating to after the completion of removing the gred and is incubated standing refining, sampling carries out stokehold spectral test, according to spectrum
Assay, molten steel component is adjusted, so that the alloy element component during molten steel meets meets C：0.20%~0.30%；Si：0.50%~
0.70%；Mn：0.60%~0.80%； Cr ：0.60%~1.10%；Ni ：0.40%~0.65%；Mo：0.50%~0.75%；Nb：0.05%
~0.15%；V：0.03%~0.05%；Ti：0.001%~0.003%；Al：0.01%~0.03%；Cu：0.02%~0.05%；P≤
0.010%；S≤0.010%；Requirement；
E, adjust to after meeting mentioned component demand, the tapping temperature of molten steel is controlled at 1610-1650 DEG C, by melted steel
Liquid is all come out of the stove makes temperature control at 1560~1580 DEG C to ladle, thermometric, then carries out bottom pour ladle cast；
F, the casting of moulding by casting need to carry out Tempering and Quenching, be heat-treated as normalizing, quenching+high tempering, so as to obtain height
Warm tempered sorbite tissue.
3. the production method of casting according to claim 2, it is characterised in that in the step F, Technology for Heating Processing is：
Normalizing temperature 50 DEG C, i.e., 880 to 910 DEG C more than Ac3 temperature；At 880 to 920 DEG C, temperature controls for hardening heat control
At 550 to 650 DEG C.
4. the production method of casting according to claim 2, it is characterised in that in the step E, using resin sand sand mold
Carry out bottom pour ladle cast.
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Also Published As
| Publication number | Publication date |
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| CN109554617B (en) | 2020-10-09 |
| CN109504903B (en) | 2021-01-29 |
| CN109504903A (en) | 2019-03-22 |
| CN107760983B (en) | 2019-03-01 |
| CN109554617A (en) | 2019-04-02 |
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Denomination of invention: A production method for low alloy ultra-high strength steel and its castings Granted publication date: 20190301 Pledgee: Industrial and Commercial Bank of China Danyang Branch Pledgor: JIANGSU DINGTAI ENGINEERING MATERIAL CO.,LTD. Registration number: Y2024980002806 |