CN108251744A - A kind of Micro Alloying railway freight-car body center plate steel and its production method - Google Patents
A kind of Micro Alloying railway freight-car body center plate steel and its production method Download PDFInfo
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- CN108251744A CN108251744A CN201810026901.6A CN201810026901A CN108251744A CN 108251744 A CN108251744 A CN 108251744A CN 201810026901 A CN201810026901 A CN 201810026901A CN 108251744 A CN108251744 A CN 108251744A
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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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
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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
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
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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
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
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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
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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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
- C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
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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
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
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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
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
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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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/005—Ferrite
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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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/009—Pearlite
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Abstract
The invention discloses a kind of Micro Alloying railway freight-car body center plate steel and its production method, the non-hardened and tempered steel chemical composition composition and its mass percentage are：C：0.09‑0.22%、Mn：0.7‑1.00%、Si：0.17‑0.37%、V：0.02‑0.10%、Ti：0.015‑0.200%、Nb：0.02‑0.15%、Ni：0.15‑0.30%、Al：0.005 0.050%, S≤0.035%, P≤0.035%, surplus are Fe and inevitable impurity；The production method includes converter smelting, LF refining, sheet billet continuous casting, heating strand, controlled rolling and controlled cooling, the cold slow cooling of plank heap, plank ball blast, normalizing heat treatment procedure.Non-hardened and tempered steel of the present invention has many advantages, such as excellent tensile strength, low-temperature impact toughness and fatigue resistance, and production method has with short production cycle, saving fuel.
Description
Technical field
The invention belongs to metallurgical technology fields, and in particular to a kind of Micro Alloying railway freight-car body center plate steel and its producer
Method.
Background technology
The relevant industries such as domestic machinery manufacturing industry carry, such as the body center plate and center bearing of railway freight-car load bearing component, greatly
Use carbon structural steels more；Carbon structural steels need modifier treatment in process of production, cause its production cost higher and quenched
The defects of processing is also easy to produce deformation, cracking, decarburization.
Non-hardened and tempered steel is a kind of novel energy-conserving green structure steel material for reducing or remitting modifier treatment, and performance and price are better than biography
The structural steel of system for substituting quenched and tempered steel, has many advantages, such as that energy saving, material comprehensive performance is preferable, shortens the production cycle, can
To reduce environmental pollution, avoid oxidation, decarburization, deformation, cracking.
The present invention provides a kind of middle low-carbon non-hardened and tempered steel and its lifes with preferable tensile strength and low-temperature impact toughness
Production method；Product can be used for railway freight-car body center plate.
Invention content
The technical problem to be solved in the present invention is to provide a kind of Micro Alloying railway freight-car body center plate steel；The present invention also provides
A kind of production method of Micro Alloying railway freight-car body center plate steel.The present invention obtains a kind of middle low-carbon microalloy containing Nb, V, Ti
Change steel, without quenching-and-tempering process, hot rolling microstructure is ferrite+pearlitic structrure, has preferable tensile strength and low temperature
Impact flexibility can effectively reduce the processing cost of user, energy saving, improve production efficiency, improve environment.
In order to solve the above technical problems, the technical solution adopted by the present invention is：A kind of Micro Alloying railway freight-car body center plate is used
Steel, the railway freight-car body center plate is formed with steel chemical composition and its mass percentage is：C：0.09-0.22%、Mn：0.70-
1.00%、Si：0.17-0.37%、V：0.02-0.10%、Ti：0.015-0.200%、Nb：0.02-0.15%、Ni：0.15-0.30%、
Al：0.005-0.050%, S≤0.035%, P≤0.035%, surplus are Fe and inevitable impurity.
Design of alloy thinking of the present invention is as follows：
Carbon：To ensure the quenching degree of steel, intensity, the low-temperature flexibility of steel are improved, the composition range of carbon is in 0.09-0.22%.
Manganese：The intensity and toughness of steel are improved, Mn has stronger solid solution strengthening effect, can reduce the phase transition temperature of steel, subtract
Slow austenite from being transformed into perlite speed improves quenching degree, and being capable of crystal grain thinning, raising intensity and toughness.But improve Mn
The volume fraction that content will improve pearlite reduces the toughness of steel, and to ensure preferable obdurability, manganese composition range is in 0.70-
1.00%。
Silicon：Si solid solubility in steel is larger, and the notable reinforced ferrite of energy plays solid solution strengthening effect higher than Mn, the increase of Si
Can ferrite volume fraction in the high steel of motion, and make crystal grain refinement, be conducive to improve toughness, silicon composition range is in 0.17-
0.37%。
Niobium, vanadium, titanium, aluminium：In steel mainly compound, tiny X are formed with C, N（C、N）It is prevented in the operation of rolling difficult to understand
Family name's body crystal grain is grown up, crystal grain thinning, generates significant reinforcing effect.V can improve quenching degree simultaneously.
Nickel：The mechanical performance of steel can be improved, increases the intensity, toughness, heat resistance of steel, while can also improve the anti-corrosion of steel
Erosion, acid-resisting and its magnetic conductivity etc.；Nickel can be with the hardness of crystal grain thinning, the quenching degree of raising steel and increase steel.
Micro Alloying railway freight-car body center plate steel ReL >=265N/mm of the present invention2, Rm >=490N/mm2, A >=19%,
AKU2≥90J。
The present invention also provides a kind of production method of Micro Alloying railway freight-car body center plate steel, the production method includes
Converter smelting, LF refining, sheet billet continuous casting, heating strand, controlled rolling and controlled cooling, the cold slow cooling of plank heap, plank ball blast, normalizing heat treatment work
Sequence.
Converter smelting process of the present invention, is smelted using desulphurised hot metal, and ferronickel is added in steel scrap, and single slag process highcasting speed goes out
Steel improves the degree of purity of molten steel, controls converter terminal：C：0.07-0.20%, P≤0.013%, temperature is controlled in 1650-1670
℃；Slag-stopping tapping, top of the slag thickness 50-70mm.
Converter smelting process of the present invention adds in aluminum deoxidier in tapping process, carries out molten steel final deoxidizing, meets oxygen
Content≤100ppm；Alloying is carried out using silicomangan, less than Mn parts ferromanganese polishing, then adds in ferro-niobium, VN alloy
Carry out alloying.
LF refining process of the present invention carries out top of the slag deoxidation using aluminum shot or calcium carbide in refining process, is tailored into target
After ingredient, ferrotianium is added in, then feeds aluminium calcium line, soft blow argon flow amount 45-100NL/min, soft blow time by 1-1.5m/ tons of steel
8-15min ensures that large inclusions float.
Sheet billet continuous casting process of the present invention, is cast using whole process protection, and tundish uses basic powder；Using electromagnetism
Stirring and dynamic soft reduction technology, electromagnetic agitation electric current are 300-400A, and dynamic soft-reduction drafts is 9-15mm；Continuous casting billet is adopted
With retarded cooling process, temperature retention time >=48h.
Heating strand process of the present invention, heating soaking zone temperature are 1180-1220 DEG C.
Controlled rolling and controlled cooling process of the present invention, start rolling temperature are 1000-1080 DEG C；Secondary 850-950 DEG C of start rolling temperature, eventually
Temperature control is rolled at 780-850 DEG C；Cooling velocity is 7.5-15 DEG C/s, and red temperature is 580-700 DEG C；Guarantee is finally organized as
Ferrite+pearlitic structrure.
The normalizing heat treatment procedure of the present invention, 730-860 DEG C of heating temperature, soaking time 30min, the type of cooling
It is air-cooled.
Process design thinking of the present invention is as follows：
The non-hardened and tempered steel that the present invention obtains is without the quenching-and-tempering processes such as quenching, being tempered after hot forging, is directly used, together
When the hot forging non-hardened and tempered steel with excellent tensile strength, low-temperature impact toughness and fatigue resistance.
The present invention is a kind of novel energy-conserving green structure steel material for reducing or remitting Tempering and Quenching, and performance and price are better than biography
The structural steel of system, can be to avoid the mass defects such as oxidation, decarburization, deformation, cracking in hardening and tempering process, for substituting quenched and tempered steel, tool
Have the advantages that comprehensive performance is preferable, shorten the production cycle, save fuel energy.
Micro Alloying railway freight-car body center plate of the present invention steel product standard and product testing canonical reference GB/T699-2015.
It is using advantageous effect caused by above-mentioned technical proposal：1st, the production cycle of the invention has substantially compared with hardening and tempering process
Shorten, manufacture cost decreases, and can significantly reduce the processing cost of user, has significant market prospects.2nd, it is of the invention
The Micro Alloying railway freight-car body center plate steel of method production, is a kind of middle low-carbon micro alloyed steel containing Nb, V, Ti, without quenched heat
Treatment process, hot rolling microstructure are ferrite+pearlitic structrure, have preferable tensile strength and low-temperature impact toughness, can be used for
Railway freight-car body center plate produces.
Description of the drawings
Fig. 1 is the metallographic structure figure of the non-hardened and tempered steel of embodiment 1.
Specific embodiment
The present invention is described in further detail in the following with reference to the drawings and specific embodiments.
Embodiment 1
The present embodiment Micro Alloying railway freight-car body center plate is formed with steel chemical composition and its mass percentage is：C：0.15%、
Mn：0.94%、Si：0.20%、V：0.04%、Ti：0.017%、Nb：0.023%、Ni：0.30%、Al：0.023%、S：0.013%、P：
0.015%, surplus is Fe and inevitable impurity.
The production method of the present embodiment Micro Alloying railway freight-car body center plate steel includes converter smelting, LF refining, slab and connects
Casting, heating strand, controlled rolling and controlled cooling, the cold slow cooling of plank heap, plank ball blast, normalizing heat treatment procedure, the following institute of specific process step
It states：
（1）Smelting procedure：In converter steelmaking process, converter terminal is controlled：C：0.07%、P：0.013%, temperature is controlled 1660
℃；Slag-stopping tapping, top of the slag thickness 68mm；
Aluminum deoxidier is added in tapping process, carries out molten steel final deoxidizing, oxygen content 100ppm；It is closed using silicomangan
Aurification less than Mn parts ferromanganese polishing, then adds in ferro-niobium, VN alloy carries out alloying；
（2）LF refining process：Top of the slag deoxidation is carried out using aluminum shot in refining process, after being tailored into target component, adds in ferrotianium, so
Aluminium calcium line is fed by 1m/ tons of steel afterwards, soft blow argon flow amount 50NL/min, soft blow time 8min ensure that large inclusions float；
（3）Continuous casting working procedure：It is cast using whole process protection, tundish uses basic powder；Using electromagnetic agitation and Dynamic Light pressure
Lower technology, electromagnetic agitation electric current are 350A, and dynamic soft-reduction drafts is 9mm；Continuous casting billet uses retarded cooling process, temperature retention time
48h obtains 250*2100mm strands；
（4）Heating strand：For strand in heating stove heat, soaking zone temperature is 1200 DEG C；
（5）Controlled rolling and controlled cooling process：Start rolling temperature is 1050 DEG C；Secondary 900 DEG C of start rolling temperature, finishing temperature control is at 790 DEG C；It rolls
Afterwards using control cooling, cooling velocity is 12 DEG C/s, and red temperature is 620 DEG C；
（6）Normalizing heat treatment procedure：820 DEG C, soaking time 30min of heating temperature, the type of cooling are air-cooled.
The present embodiment Micro Alloying railway freight-car body center plate steel is organized as ferrite+pearlite, and metallographic structure figure is shown in Fig. 1
（Remaining embodiment attached drawing is similar to Fig. 1, therefore omits）；Mechanical property is：ReL：358N/mm2, Rm：535N/mm2, A：23%, break
Face shrinking percentage Z：55%, AKU2：174J、189J、114J.
Embodiment 2
The present embodiment Micro Alloying railway freight-car body center plate is formed with steel chemical composition and its mass percentage is：C：0.22%、
Mn：0.83%、Si：0.17%、V：0.06%、Ti：0.2%、Nb：0.09%、Ni：0.17%、Al：0.05%、S：0.026%、P：
0.035%, surplus is Fe and inevitable impurity.
The production method of the present embodiment Micro Alloying railway freight-car body center plate steel includes converter smelting, LF refining, slab and connects
Casting, heating strand, controlled rolling and controlled cooling, the cold slow cooling of plank heap, plank ball blast, normalizing heat treatment procedure, specific production technology are as follows：
（1）Smelting procedure：In converter steelmaking process, converter terminal is controlled：C：0.15%、P：0.010%, temperature is controlled 1665
℃；Slag-stopping tapping, top of the slag thickness 55mm；
Aluminum deoxidier is added in tapping process, carries out molten steel final deoxidizing, oxygen content 50ppm；It is closed using silicomangan
Aurification less than Mn parts ferromanganese polishing, then adds in ferro-niobium, VN alloy carries out alloying；
（2）LF refining process：Top of the slag deoxidation is carried out using calcium carbide in refining process, after being tailored into target component, adds in ferrotianium, so
Aluminium calcium line is fed by 1.2m/ tons of steel afterwards, soft blow argon flow amount 45NL/min, soft blow time 9min ensure on large inclusions
It is floating；
（3）Continuous casting working procedure：It is cast using whole process protection, tundish uses basic powder；Using electromagnetic agitation and Dynamic Light pressure
Lower technology, electromagnetic agitation electric current are 300A, and dynamic soft-reduction drafts is 9mm；Continuous casting billet uses retarded cooling process, temperature retention time
60h obtains 250*2100mm strands；
（4）Heating strand：For strand in heating stove heat, soaking zone temperature is 1180 DEG C；
（5）Controlled rolling and controlled cooling process：Start rolling temperature is 1045 DEG C；Secondary 860 DEG C of start rolling temperature, finishing temperature control is at 800 DEG C；It rolls
Afterwards using control cooling, cooling velocity is 8 DEG C/s, and red temperature is 650 DEG C；
（6）Normalizing heat treatment procedure：750 DEG C, soaking time 30min of heating temperature, the type of cooling are air-cooled.
The present embodiment Micro Alloying railway freight-car body center plate steel is organized as ferrite+pearlite；Mechanical property is：ReL：
401N/mm2, Rm：565N/mm2, A：24%, Z：55%, AKU2：184J、191J、174J.
Embodiment 3
The present embodiment Micro Alloying railway freight-car body center plate is formed with steel chemical composition and its mass percentage is：C：0.12%、
Mn：0.70%、Si：0.30%、V：0.02%、Ti：0.11%、Nb：0.15%、Ni：0.20%、Al：0.036%、S：0.035%、P：
0.022%, surplus is Fe and inevitable impurity.
The production method of the present embodiment Micro Alloying railway freight-car body center plate steel includes converter smelting, LF refining, slab and connects
Casting, heating strand, controlled rolling and controlled cooling, the cold slow cooling of plank heap, plank ball blast, normalizing heat treatment procedure, specific production technology are as follows：
（1）Smelting procedure：In converter steelmaking process, converter terminal is controlled：C：0.10%、P：0.011%, temperature is controlled 1650
℃；Slag-stopping tapping, top of the slag thickness 50mm；
Aluminum deoxidier is added in tapping process, carries out molten steel final deoxidizing, oxygen content 70ppm；It is closed using silicomangan
Aurification less than Mn parts ferromanganese polishing, then adds in ferro-niobium, VN alloy carries out alloying；
（2）LF refining process：Top of the slag deoxidation is carried out using aluminum shot in refining process, after being tailored into target component, adds in ferrotianium, so
Aluminium calcium line is fed by 1.5m/ tons of steel afterwards, soft blow argon flow amount 50NL/min, soft blow time 10min ensure on large inclusions
It is floating；
（3）Continuous casting working procedure：It is cast using whole process protection, tundish uses basic powder；Using electromagnetic agitation and Dynamic Light pressure
Lower technology, electromagnetic agitation electric current are 350A, and dynamic soft-reduction drafts is 15mm；Continuous casting billet uses retarded cooling process, temperature retention time
50h obtains 280*1800mm strands；
（4）Heating strand：For strand in heating stove heat, soaking zone temperature is 1220 DEG C；
（5）Controlled rolling and controlled cooling process：Start rolling temperature is 1000 DEG C；Secondary 870 DEG C of start rolling temperature, finishing temperature control is at 790 DEG C；It rolls
Afterwards using control cooling, cooling velocity is 10 DEG C/s, and red temperature is 600 DEG C；
（6）Normalizing heat treatment procedure：780 DEG C, soaking time 30min of heating temperature, the type of cooling are air-cooled.
The present embodiment Micro Alloying railway freight-car body center plate steel is organized as ferrite+pearlite；Mechanical property is：ReL：
369N/mm2, Rm：554N/mm2, A：23%, Z：55%, AKU2：135J、181J、132J.
Embodiment 4
The present embodiment Micro Alloying railway freight-car body center plate is formed with steel chemical composition and its mass percentage is：C：0.18%、
Mn：1.00%、Si：0.37%、V：0.08%、Ti：0.015%、Nb：0.12%、Ni：0.19%、Al：0.005%、S：0.018%、P：
0.016%, surplus is Fe and inevitable impurity.
The production method of the present embodiment Micro Alloying railway freight-car body center plate steel includes converter smelting, LF refining, slab and connects
Casting, heating strand, controlled rolling and controlled cooling, the cold slow cooling of plank heap, plank ball blast, normalizing heat treatment procedure, specific production technology are as follows：
（1）Smelting procedure：In converter steelmaking process, converter terminal is controlled：C：0.20%、P：0.008%, temperature is controlled 1655
℃；Slag-stopping tapping, top of the slag thickness 65mm；
Aluminum deoxidier is added in tapping process, carries out molten steel final deoxidizing, oxygen content 60ppm；It is closed using silicomangan
Aurification less than Mn parts ferromanganese polishing, then adds in ferro-niobium, VN alloy carries out alloying；
（2）LF refining process：Top of the slag deoxidation is carried out using calcium carbide in refining process, after being tailored into target component, adds in ferrotianium, so
Aluminium calcium line is fed by 1.1m/ tons of steel afterwards, soft blow argon flow amount 100NL/min, soft blow time 15min ensure large inclusions
It floats；
（3）Continuous casting working procedure：It is cast using whole process protection, tundish uses basic powder；Using electromagnetic agitation and Dynamic Light pressure
Lower technology, electromagnetic agitation electric current are 400A, and dynamic soft-reduction drafts is 9mm；Continuous casting billet uses retarded cooling process, temperature retention time
55h obtains 280*1800mm strands；
（4）Heating strand：For strand in heating stove heat, soaking zone temperature is 1200 DEG C；
（5）Controlled rolling and controlled cooling process：Start rolling temperature is 1050 DEG C；Secondary 950 DEG C of start rolling temperature, finishing temperature control is at 850 DEG C；It rolls
Afterwards using control cooling, cooling velocity is 7.5 DEG C/s, and red temperature is 700 DEG C；
（6）Normalizing heat treatment procedure：860 DEG C, soaking time 30min of heating temperature, the type of cooling are air-cooled.
The present embodiment Micro Alloying railway freight-car body center plate steel is organized as ferrite+pearlite；Mechanical property is：ReL：
381N/mm2, Rm：573N/mm2, A：24.5%, Z：58%, AKU2：105J、113J、159J.
Embodiment 5
The present embodiment Micro Alloying railway freight-car body center plate is formed with steel chemical composition and its mass percentage is：C：0.09%、
Mn：0.78%、Si：0.32%、V：0.10%、Ti：0.16%、Nb：0.02%、Ni：0.15%、Al：0.045%、S：0.024%、P：
0.026%, surplus is Fe and inevitable impurity.
The production method of the present embodiment Micro Alloying railway freight-car body center plate steel includes converter smelting, LF refining, slab and connects
Casting, heating strand, controlled rolling and controlled cooling, the cold slow cooling of plank heap, plank ball blast, normalizing heat treatment procedure, specific production technology are as follows：
（1）Smelting procedure：In converter steelmaking process, converter terminal is controlled：C：0.12%、P：0.006%, temperature is controlled 1670
℃；Slag-stopping tapping, top of the slag thickness 70mm；
Aluminum deoxidier is added in tapping process, carries out molten steel final deoxidizing, oxygen content 75ppm；It is closed using silicomangan
Aurification less than Mn parts ferromanganese polishing, then adds in ferro-niobium, VN alloy carries out alloying；
（2）LF refining process：Top of the slag deoxidation is carried out using aluminum shot in refining process, after being tailored into target component, adds in ferrotianium, so
Aluminium calcium line is fed by 1.3m/ tons of steel afterwards, soft blow argon flow amount 50NL/min, soft blow time 14min ensure on large inclusions
It is floating；
（3）Continuous casting working procedure：It is cast using whole process protection, tundish uses basic powder；Using electromagnetic agitation and Dynamic Light pressure
Lower technology, electromagnetic agitation electric current are 350A, and dynamic soft-reduction drafts is 9mm；Continuous casting billet uses retarded cooling process, temperature retention time
52h obtains 250*2100mm strands；
（4）Heating strand：For strand in heating stove heat, soaking zone temperature is 1180 DEG C；
（5）Controlled rolling and controlled cooling process：Start rolling temperature is 1080 DEG C；Secondary 850 DEG C of start rolling temperature, finishing temperature control is at 780 DEG C；It rolls
Afterwards using control cooling, cooling velocity is 15 DEG C/s, and red temperature is 580 DEG C；
（6）Normalizing heat treatment procedure：730 DEG C, soaking time 30min of heating temperature, the type of cooling are air-cooled.
The present embodiment Micro Alloying railway freight-car body center plate steel is organized as ferrite+pearlite；Mechanical property is：ReL：
364N/mm2, Rm：539N/mm2, A：24%, Z：56%, AKU2：135J、130J、115J.
The above embodiments are only used to illustrate and not limit the technical solutions of the present invention, although with reference to above-described embodiment to this hair
It is bright to be described in detail, it will be understood by those of ordinary skill in the art that：Still can the present invention be modified or be waited
With replacing, without departing from the spirit or scope of the invention, or any substitutions, the power in the present invention should all be covered
In sharp claimed range.
Claims (10)
- A kind of 1. Micro Alloying railway freight-car body center plate steel, which is characterized in that the Micro Alloying railway freight-car body center plate tempering It studies and is grouped as and its mass percentage is：C：0.09-0.22%、Mn：0.70-1.00%、Si：0.17-0.37%、V：0.02- 0.10%、Ti：0.015-0.200%、Nb：0.02-0.15%、Ni：0.15-0.30%、Al：0.005-0.050%、S≤0.035%、P ≤ 0.035%, surplus is Fe and inevitable impurity.
- A kind of 2. Micro Alloying railway freight-car body center plate steel according to claim 1, which is characterized in that the Micro Alloying iron Afloat vehicle body center plate steel ReL >=265N/mm2, Rm >=490N/mm2, A >=19%, AKU2 >=90J.
- 3. based on a kind of production method of Micro Alloying railway freight-car body center plate steel described in claims 1 or 2, feature exists In the production method includes converter smelting, LF refining, sheet billet continuous casting, heating strand, controlled rolling and controlled cooling, the cold slow cooling of plank heap, plate Material ball blast, normalizing heat treatment procedure.
- A kind of 4. production method of Micro Alloying railway freight-car body center plate steel according to claim 3, which is characterized in that institute Converter smelting process is stated, is smelted using desulphurised hot metal, ferronickel is added in steel scrap, and the tapping of single slag process highcasting speed improves the pure of molten steel Cleanliness controls converter terminal：C：0.07-0.20%, P≤0.013%, temperature is controlled at 1650-1670 DEG C；Slag-stopping tapping, the top of the slag Thickness 50-70mm.
- A kind of 5. production method of Micro Alloying railway freight-car body center plate steel according to claim 3, which is characterized in that institute Converter smelting process is stated, aluminum deoxidier is added in tapping process, carries out molten steel final deoxidizing, meet oxygen content≤100ppm；It adopts Alloying is carried out with silicomangan, less than Mn parts ferromanganese polishing, then adds in ferro-niobium, VN alloy carries out alloying.
- 6. a kind of production method of Micro Alloying railway freight-car body center plate steel according to claim 3-5 any one, It is characterized in that, the LF refining process, carries out top of the slag deoxidation using aluminum shot or calcium carbide in refining process, be tailored into target component Afterwards, ferrotianium is added in, then feeds aluminium calcium line, soft blow argon flow amount 45-100NL/min, soft blow time 8- by 1-1.5m/ tons of steel 15min ensures that large inclusions float.
- 7. a kind of production method of Micro Alloying railway freight-car body center plate steel according to claim 3-5 any one, It is characterized in that, the sheet billet continuous casting process is cast using whole process protection, and tundish uses basic powder；Using electromagnetic agitation And dynamic soft reduction technology, electromagnetic agitation electric current are 300-400A, dynamic soft-reduction drafts is 9-15mm；Continuous casting billet is using slow Cold technique, temperature retention time >=48h.
- 8. a kind of production method of Micro Alloying railway freight-car body center plate steel according to claim 3-5 any one, It is characterized in that, the heating strand process, heating soaking zone temperature is 1180-1220 DEG C.
- 9. a kind of production method of Micro Alloying railway freight-car body center plate steel according to claim 3-5 any one, It is characterized in that, the controlled rolling and controlled cooling process, start rolling temperature is 1000-1080 DEG C；Secondary 850-950 DEG C of start rolling temperature, finish to gauge temperature Degree control is at 780-850 DEG C；Cooling velocity is 7.5-15 DEG C/s, and red temperature is 580-700 DEG C.
- 10. a kind of production method of Micro Alloying railway freight-car body center plate steel according to claim 3-5 any one, It is characterized in that, the normalizing heat treatment procedure, 730-860 DEG C of heating temperature, soaking time 30min, the type of cooling is air-cooled.
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