CN106978566A - A kind of rail truck weather resisting steel and preparation method thereof - Google Patents
A kind of rail truck weather resisting steel and preparation method thereof Download PDFInfo
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- CN106978566A CN106978566A CN201710289606.5A CN201710289606A CN106978566A CN 106978566 A CN106978566 A CN 106978566A CN 201710289606 A CN201710289606 A CN 201710289606A CN 106978566 A CN106978566 A CN 106978566A
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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
- C21D1/26—Methods of annealing
-
- 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
-
- 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
- C21D8/0236—Cold rolling
-
- 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
-
- 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
-
- 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
- C22C38/18—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
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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 Sheet Steel (AREA)
Abstract
The invention discloses a kind of rail truck weather resisting steel and preparation method thereof, the percentage by weight of its chemical composition is：[C]：0.040~0.070%；[Si]：0.25~0.55%；[Mn]：0.20~0.50%；[P]：0.070~0.12%；[S]≤0.020%；[Als]：0.020~0.050%；[Cr]：0.35~0.55%；[Cu]：0.25~0.45%；[Ni]：0.15~0.30%；Surplus is iron and inevitably micro-.The present invention forms the densification of one layer of about 50~100 μ m-thick and the amorphous state spinel oxides layer good with parent metal adhesiveness using the electrochemistry unpolarizing of the elements such as Cu, P, Cr, Ni between rusty scale and matrix.And it is the smelting of core process, hot rolling, cold rolling, annealing technique productions scheme and core production technology to form CSP sheet billet continuous casting and rolling production lines and bell type annealing furnace first, obtain chemical composition and stable mechanical performance, weather resisting steel with high intensity and good plasticity and toughness, yield strength >=320MPa, tensile strength >=460MPa, elongation percentage >=35.5%, yield tensile ratio≤0.70.
Description
Technical field
The invention belongs to low-alloy steel manufacturing technology field, and in particular to a kind of rail truck weather resisting steel and its
Preparation method.
Background technology
At present, Q310NQL2 rail trucks are generally with weather resisting steel production method：Blast-melted → converter smelting
→ LF refining processing → routine conticaster → conventional hot continuous rolling machine → pickling cold continuous rolling → continuous annealing → commodity.Conventional conticaster life
The weather resisting steel of production is low because of its cooldown rate, strip low intensity, production same level weather resisting steel when with addition of conjunction
Gold amount is big, and production cost is higher, in addition, the conventional conticaster production cycle is longer.
The content of the invention
The invention aims to solve technical problem present in prior art, there is provided a kind of chemical composition and machinery
Performance is stable and has the rail truck weather resisting steel of high intensity and good plasticity and toughness.
Another object of the present invention is to provide for a kind of preparation method of rail truck weather resisting steel.
In order to achieve the above object, the present invention uses following technical scheme：A kind of rail truck weather resisting steel, its
The percentage by weight of chemical composition is：[C]：0.040~0.070%；[Si]：0.25~0.55%；[Mn]：0.20~0.50%；
[P]：0.070~0.12%；[S]≤0.020%；[Als]：0.020~0.050%；[Cr]：0.35~0.55%；[Cu]：0.25
~0.45%；[Ni]：0.15~0.30%；Surplus is iron and inevitably micro-.
A kind of preparation method of rail truck weather resisting steel, technological process is followed successively by：Blast-melted, converter smelting
Refining, the processing of LF liquid steel refinings, CSP CSPs, pickling cold continuous rolling, cover annealing, smooth, test package storage.
Further, in the converter steelmaking process endpoint carbon content be 0.03%~0.045%, tapping temperature be 1640~
1680 DEG C, copper coin, ferronickel before iron making with steel scrap with addition of, tapping to when 1/3 with steel stream with addition of low-carbon ferrochromium, ferrophosphorus and steel shot aluminum
With SiMn alloys.
Further, in the LF Refining Processing Procedures molten steel heated up, deep deoxidation, at slag making desulfurization and calcium
Reason, out-station temperature is controlled at 1590~1610 DEG C.
Further, using the vertical bending CSP thin-slab casters of 2 streams in the CSP During Continuous Casting-Rolling Process, company pours
Tundish temperature is 1540~1560 DEG C, and middle bag uses carbon-free covering agent, and using low-carbon weathering steel mould flux, Casting speed is
4.2~4.7m/min, slab heating temperature is 1150~1190 DEG C；Using six frame continuous hot-rolling mills, finishing temperature control is 880
~920 DEG C, 580~620 DEG C of coiling temperature.
Further, cold rolling total reduction >=50% in the pickling cold continuous rolling process.
Further, annealing temperature is 610 DEG C~660 DEG C during the cover annealing, and the rate of heat addition≤60 DEG C are protected
Warm time >=14h, band heating mantles control cooling 2h, cooldown rate≤40 DEG C, tapping temperature≤60 DEG C.
Further, elongation percentage is set as 1.2%~2.0% in the formation process.
The present invention has the advantages that compared with the prior art：
1st, the present invention is directed to use requirement, performance characteristics and the production technology of Q310NQL2 railway vehicle dynamics, using low-carbon and
The mentality of designing of Cr, Ni, Cu, P alloying, using the electrochemistry unpolarizing of the elements such as Cu, P, Cr, Ni, in rusty scale and base
The densification of one layer of about 50~100 μ m-thick and the amorphous state spinel oxides good with parent metal adhesiveness are formed between body
Layer.And controlled by steel grades design and production process, CSP sheet billet continuous casting and rolling production lines and cover are formd first
Formula annealing furnace is the smelting, hot rolling, cold rolling, annealing technique productions scheme and core production technology of core process, obtains chemistry
Composition and stable mechanical performance, the weather resisting steel with high intensity and good plasticity and toughness, yield strength >=320MPa, tension
Intensity >=460MPa, elongation percentage >=35.5%, yield tensile ratio≤0.70 can meet Q310NQL2 rail truck weather resisting steels
Requirement.
2nd, the present invention is using CSP sheet billet continuous casting and rolling production lines production cold rolling feedses, hence it is evident that be different from other conventional raw
Production method, it has the low technological advantage of with short production cycle, production cost.
3rd, annealing of the present invention using bell type annealing furnace progress after cold rolling, it has the annealing time long, performance
Fluctuation range is small, the advantages of plasticity and toughness and good processability.
Embodiment
With reference to specific embodiment, the invention will be further described.
Following embodiments use CSP sheet billet continuous casting and rolling production lines and bell-type annealing technique productions Q310NQL2 railway carriages
With weather resisting steel, its technological process is：Blast-melted → converter smelting → LF liquid steel refinings processing → CSP sheet billets connect
Cast tandem rolling → pickling cold continuous rolling → cover annealing → smooth → test package storage.
Embodiment 1
Endpoint carbon content is 0.03% in converter steelmaking process, and tapping temperature is 1640 DEG C, and copper coin, ferronickel are before iron making with steel scrap
With addition of, tapping to when 1/3 with steel stream with addition of low-carbon ferrochromium, ferrophosphorus and steel shot aluminum and SiMn alloys.LF Refining Processing Procedures
Middle molten steel is heated up, deep deoxidation, slag making desulfurization and Calcium treatment, out-station temperature controlled at 1590 DEG C.CSP CSPs
During tundish temperature is poured for 1540 DEG C using the vertical bending CSP thin-slab casters of 2 streams, company, middle bag uses carbon-free covering agent, makes
With low-carbon weathering steel mould flux, Casting speed is 4.2m/min, and slab heating temperature is 1150 DEG C；Using six frames heat even
Milling train, finishing temperature control is in 880 DEG C, 580 DEG C of coiling temperature.Cold rolling total reduction is 50% in pickling cold continuous rolling process.Bell-type
Annealing temperature is 610 DEG C during furnace annealing, 60 DEG C of the rate of heat addition, and soaking time maintains cold-point temperature above 14h, band heating mantles
Control cooling 2h, 40 DEG C of cooldown rate, 60 DEG C of tapping temperature.Elongation percentage is set as 1.63%, final products specification in formation process
2.50X1250mm。
Finished product composition：
[C]:0.051%；[Si]:0.332%；[Mn]:0.391%；[P]:0.0907%；[S]:0.0020%；[Als]:0.0389%；
[Cr]:0.434%；[Ni]:0.188%；[Cu]:0.307%；Surplus is that surplus is iron and inevitably micro-.
Properties of product are as follows：
Embodiment 2
Endpoint carbon content is 0.04% in converter steelmaking process, and tapping temperature is 1680 DEG C, and copper coin, ferronickel are before iron making with steel scrap
With addition of, tapping to when 1/3 with steel stream with addition of low-carbon ferrochromium, ferrophosphorus and steel shot aluminum and SiMn alloys.LF Refining Processing Procedures
Middle molten steel is heated up, deep deoxidation, slag making desulfurization and Calcium treatment, out-station temperature controlled at 1600 DEG C.CSP CSPs
During tundish temperature is poured for 1550 DEG C using the vertical bending CSP thin-slab casters of 2 streams, company, middle bag uses carbon-free covering agent, makes
With low-carbon weathering steel mould flux, Casting speed is 4.5m/min, and slab heating temperature is 1170 DEG C；Using six frames heat even
Milling train, finishing temperature control is in 900 DEG C, 600 DEG C of coiling temperature.Cold rolling total reduction is 55.55% in pickling cold continuous rolling process.
Annealing temperature is 640 DEG C during cover annealing, and 58.3 DEG C of the rate of heat addition, soaking time maintains cold-point temperature above 15h, band
Heating mantles control cooling 2h, 38 DEG C of cooldown rate, 59.4 DEG C of tapping temperature.Elongation percentage is set as 1.2% in formation process, finally
Product specification 2.0X1080mm.
Finished product composition：
[C]:0.040%；[Si]:0.55%；[Mn]:0.20%；[P]:0.12%；[S]:0.020%；[Als]:0.050%；[Cr]:
0.35%；[Ni]:0.15%；[Cu]:0.45%；Surplus is that surplus is iron and inevitably micro-.
Properties of product are as follows：
Embodiment 3
Endpoint carbon content is 0.045% in converter steelmaking process, and tapping temperature is 1660 DEG C, and copper coin, ferronickel are before iron making with steel scrap
With addition of, tapping to when 1/3 with steel stream with addition of low-carbon ferrochromium, ferrophosphorus and steel shot aluminum and SiMn alloys.LF Refining Processing Procedures
Middle molten steel is heated up, deep deoxidation, slag making desulfurization and Calcium treatment, out-station temperature controlled at 1610 DEG C.CSP CSPs
During tundish temperature is poured for 1560 DEG C using the vertical bending CSP thin-slab casters of 2 streams, company, middle bag uses carbon-free covering agent, makes
With low-carbon weathering steel mould flux, Casting speed is 4.7m/min, and slab heating temperature is 1190 DEG C；Using six frames heat even
Milling train, finishing temperature control is in 920 DEG C, 620 DEG C of coiling temperature.Cold rolling total reduction is 57.14% in pickling cold continuous rolling process.
Annealing temperature is 660 DEG C during cover annealing, and 57.2 DEG C of the rate of heat addition, soaking time maintains cold-point temperature above 14.5h,
Band heating mantles control cooling 2h, 40 DEG C of cooldown rate, 59.0 DEG C of tapping temperature.Elongation percentage is set as 2.0% in formation process, most
Finished product specification 1.5X1000mm.
Finished product composition：
[C]:0.070%；[Si]:0.25%；[Mn]:0.50%；[P]:0.070%；[S]:0.0170%；[Als]:0.020%；
[Cr]:0.55%；[Ni]:0.30%；[Cu]:0.25%；Surplus is that surplus is iron and inevitably micro-.
Properties of product are as follows：
Claims (8)
1. a kind of rail truck weather resisting steel, it is characterised in that：The percentage by weight of its chemical composition is：[C]：
0.040~0.070%；[Si]：0.25~0.55%；[Mn]：0.20~0.50%；[P]：0.070~0.12%；[S]≤
0.020%；[Als]：0.020~0.050%；[Cr]：0.35~0.55%；[Cu]：0.25~0.45%；[Ni]：0.15~
0.30%；Surplus is iron and inevitably micro-.
2. the preparation method of rail truck weather resisting steel described in a kind of claim 1, it is characterised in that：Technological process according to
It is secondary to be：Blast-melted, converter smelting, the processing of LF liquid steel refinings, CSP CSPs, pickling cold continuous rolling, bell furnace are moved back
Fiery, smooth, test package storage.
3. a kind of preparation method of rail truck weather resisting steel according to claim 2, it is characterised in that：It is described
Endpoint carbon content is 0.03%~0.045% in converter steelmaking process, and tapping temperature is 1640~1680 DEG C, and copper coin, ferronickel are being converted
Before iron with steel scrap with addition of, tapping to when 1/3 with steel stream with addition of low-carbon ferrochromium, ferrophosphorus and steel shot aluminum and SiMn alloys.
4. a kind of preparation method of rail truck weather resisting steel according to claim 2, it is characterised in that：It is described
In LF Refining Processing Procedures molten steel heated up, deep deoxidation, slag making desulfurization and Calcium treatment, out-station temperature control 1590~
1610℃。
5. a kind of preparation method of rail truck weather resisting steel according to claim 2, it is characterised in that：It is described
Using the vertical bending CSP thin-slab casters of 2 streams in CSP During Continuous Casting-Rolling Process, it is 1540~1560 that tundish temperature pours in company
DEG C, middle bag uses carbon-free covering agent, using low-carbon weathering steel mould flux, and Casting speed is 4.2~4.7m/min, and strand adds
Hot temperature is 1150~1190 DEG C；Using six frame continuous hot-rolling mills, finishing temperature control is in 880~920 DEG C, coiling temperature 580
~620 DEG C.
6. a kind of preparation method of rail truck weather resisting steel according to claim 2, it is characterised in that：It is described
Cold rolling total reduction >=50% in pickling cold continuous rolling process.
7. a kind of preparation method of rail truck weather resisting steel according to claim 2, it is characterised in that：It is described
Annealing temperature is 610 DEG C~660 DEG C during cover annealing, the rate of heat addition≤60 DEG C, soaking time >=14h, band heating mantles
Control cooling 2h, cooldown rate≤40 DEG C, tapping temperature≤60 DEG C.
8. a kind of preparation method of rail truck weather resisting steel according to claim 2, it is characterised in that：It is described
Elongation percentage is set as 1.2%~2.0% in formation process.
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| CN201710289606.5A CN106978566A (en) | 2017-04-27 | 2017-04-27 | A kind of rail truck weather resisting steel and preparation method thereof |
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Cited By (3)
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| CN109234635A (en) * | 2018-10-29 | 2019-01-18 | 南京钢铁股份有限公司 | A kind of 345MPa grades of low yield ratio weathering resistant steel and preparation method thereof |
| CN110229948A (en) * | 2019-06-04 | 2019-09-13 | 甘肃酒钢集团宏兴钢铁股份有限公司 | A kind of Cu, P, Cr, Ni class cold rolling atmospheric corrosion resistance steel band and its production method |
| CN110317936A (en) * | 2019-07-31 | 2019-10-11 | 马鞍山钢铁股份有限公司 | A kind of motor train compartment shell cold rolling weather resisting steel and preparation method thereof |
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| CN109234635A (en) * | 2018-10-29 | 2019-01-18 | 南京钢铁股份有限公司 | A kind of 345MPa grades of low yield ratio weathering resistant steel and preparation method thereof |
| CN110229948A (en) * | 2019-06-04 | 2019-09-13 | 甘肃酒钢集团宏兴钢铁股份有限公司 | A kind of Cu, P, Cr, Ni class cold rolling atmospheric corrosion resistance steel band and its production method |
| CN110317936A (en) * | 2019-07-31 | 2019-10-11 | 马鞍山钢铁股份有限公司 | A kind of motor train compartment shell cold rolling weather resisting steel and preparation method thereof |
| CN110317936B (en) * | 2019-07-31 | 2021-06-15 | 马鞍山钢铁股份有限公司 | Cold-rolled weather-resistant steel for motor car carriage shell and preparation method thereof |
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Application publication date: 20170725 |