CN105018875B - A kind of preparation method for the Q＆P steel that carbon partition is completed in hot galvanizing process - Google Patents
A kind of preparation method for the Q＆P steel that carbon partition is completed in hot galvanizing process Download PDFInfo
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- CN105018875B CN105018875B CN201510461123.XA CN201510461123A CN105018875B CN 105018875 B CN105018875 B CN 105018875B CN 201510461123 A CN201510461123 A CN 201510461123A CN 105018875 B CN105018875 B CN 105018875B
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 63
- 239000010959 steel Substances 0.000 title claims abstract description 63
- 238000000034 method Methods 0.000 title claims abstract description 35
- 238000005246 galvanizing Methods 0.000 title claims abstract description 29
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 26
- 238000005192 partition Methods 0.000 title claims abstract description 21
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 20
- 238000002360 preparation method Methods 0.000 title claims abstract description 8
- 238000005096 rolling process Methods 0.000 claims abstract description 27
- 229910001566 austenite Inorganic materials 0.000 claims abstract description 19
- 239000011701 zinc Substances 0.000 claims abstract description 18
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims abstract description 15
- 229910052725 zinc Inorganic materials 0.000 claims abstract description 15
- 238000000137 annealing Methods 0.000 claims abstract description 13
- 238000005097 cold rolling Methods 0.000 claims abstract description 12
- 239000000203 mixture Substances 0.000 claims abstract description 12
- 239000007788 liquid Substances 0.000 claims abstract description 10
- 238000010438 heat treatment Methods 0.000 claims abstract description 8
- 239000012535 impurity Substances 0.000 claims abstract description 7
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 7
- 229910052750 molybdenum Inorganic materials 0.000 claims abstract description 7
- 229910052758 niobium Inorganic materials 0.000 claims abstract description 7
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 7
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 7
- 238000010792 warming Methods 0.000 claims abstract description 7
- 150000001721 carbon Chemical group 0.000 claims abstract description 6
- 238000001816 cooling Methods 0.000 claims abstract description 5
- 238000003723 Smelting Methods 0.000 claims abstract description 4
- 238000009749 continuous casting Methods 0.000 claims abstract description 4
- 238000005554 pickling Methods 0.000 claims abstract description 4
- 238000010791 quenching Methods 0.000 claims description 14
- 230000000171 quenching effect Effects 0.000 claims description 14
- 238000009825 accumulation Methods 0.000 claims description 11
- 229910000734 martensite Inorganic materials 0.000 claims description 11
- 230000000717 retained effect Effects 0.000 claims description 11
- 229910000859 α-Fe Inorganic materials 0.000 claims description 4
- 238000007664 blowing Methods 0.000 claims description 3
- 229910052745 lead Inorganic materials 0.000 claims description 3
- 229910052742 iron Inorganic materials 0.000 claims description 2
- 235000015170 shellfish Nutrition 0.000 claims 1
- 238000005516 engineering process Methods 0.000 abstract description 6
- 238000004519 manufacturing process Methods 0.000 abstract description 6
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 229910001563 bainite Inorganic materials 0.000 description 2
- 229910052793 cadmium Inorganic materials 0.000 description 2
- 238000009510 drug design Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000007747 plating Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 206010016256 fatigue Diseases 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000000638 solvent extraction Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Landscapes
- Heat Treatment Of Sheet Steel (AREA)
- Coating With Molten Metal (AREA)
Abstract
A kind of preparation method for the Q＆P steel that carbon partition is completed in hot galvanizing process, belongs to metallurgical technology field, carries out according to the following steps：（1）By set component smelting molten steel, steel billet is made in refined and continuous casting；Its composition contains C 0.15 ~ 0.30%, Si 1.0 ~ 2.0%, Mn 1.0 ~ 2.5%, Mo 0.1 ~ 0.2%, Nb 0.04 ~ 0.06%, P≤0.015% by weight percentage, and S≤0.005%, N≤0.006%, remaining is Fe and inevitable impurity；（2）Roughing will be carried out after heating steel billet and finish rolling, cooling are batched；（3）Cold rolling after pickling；（4）Continuous annealing；（5）450 ~ 470 DEG C are warming up to, galvanizing is carried out using 455 ~ 465 DEG C of zinc liquid, carbon atom occurs during this simultaneously to not changing austenite enrichment, i.e. carbon partition.The method of the present invention shortens the technological process of production of galvanizing Q＆P steel.
Description
Technical field
The invention belongs to metallurgical technology field, more particularly to a kind of Q＆P steel that carbon partition is completed in hot galvanizing process
Preparation method.
Background technology
2003, professor J.G.Speer of Colorado School of Mines proposed quenching-partition (quenching for the first time
And partitioning, Q＆P) Technology for Heating Processing, traditional TRIP composition of steel after the PROCESS FOR TREATMENT obtain preferably it is strong
Plasticity combines.
The main process of Q＆P techniques is：Steel is heated to Ac3More than temperature or Ac1-Ac3Between carry out complete austenitizing
Or partial saturation, it is quickly cooled to martensite start temperature (M after being incubated a period of times) and martensitic traoformation terminate
Temperature (Mf) between a certain hardening heat, now martensitic traoformation is incomplete, does not change Ovshinsky comprising a certain amount of in tissue
Body；Then it is incubated in certain partition temperature, makes carbon atom rich from oversaturated martensite to austenite diffusion is not changed
Collection so that the austenite of rich carbon is sufficiently stable, no longer undergone phase transition in subsequent cooling procedure it is final retain to room temperature it
Under；When partition temperature is equal to hardening heat, commonly known as " step " carbon matches somebody with somebody division technique；When partition temperature is higher than hardening heat
When, then it is commonly referred to as that " two steps " carbon matches somebody with somebody division technique；In addition, it is worthy of note that, carry out quenching-partition again through complete austenitizing
It is mainly martensite+retained austenite to handle tissue in obtained Q＆P steel；And carry out quenching-matching somebody with somebody again after partial saturation
The Q＆P structure of steel that office manages to obtain is martensite+ferrite+retained austenite.
Compared with traditional quenching-tempered steel, it is because being wrapped in tissue that why there is Q＆P steel excellent strong plasticity, which to combine,
Retained austenite containing certain content, these residual austenites are known from experience occurs TRIP effects in plastic history, i.e., remaining difficult to understand
Family name's body is to martensitic traoformation, so as to improve the intensity of material and plasticity；At present, Q＆P steel is first as the automobile steel field third generation
Enter one of high-strength steel, got growing concern for.
Hot-dip galvanizing sheet steel has good decay resistance, therefore has obtained widely making with sheet material field in body of a motor car
With；Hot dip galvanizing process is usually in the pure zinc plating solution for immerse strip 450 ~ 460 DEG C or so, by the immersion plating of short time, in band
Steel surface forms certain thickness zinc layers；As the cry of energy-saving and emission-reduction, automotive light weight technology grows to even greater heights, advanced high-strength steel is in vapour
Proportion is increasing on car vehicle body, and representative steel grade of the Q＆P steel as the advanced high-strength steel of the third generation, the production of its cold rolling hot dip galvanizing
The production of product is very necessary；How the design concept of Q＆P steel and the production technology of galvanizing combined, cold-strip steel is continuous
Quenching and the carbon partition process of Q＆P techniques are realized in annealing and galvanizing respectively, there is important researching value.
The content of the invention
It is an object of the invention to provide a kind of preparation method for the Q＆P steel that carbon partition is completed in hot galvanizing process, pass through
Rational design of alloy, the quenching process of Q＆P steel is completed during continuous annealing, is realized in subsequent hot galvanizing process
Carbon partition process, while production procedure is shortened, obtain the cold rolling hot dip galvanizing Q＆P steel of function admirable.
The method of the present invention is carried out according to the following steps：
1st, steel billet is made by set component smelting molten steel, refined and continuous casting；Its composition by weight percentage containing C 0.15 ~
0.30%, Si 1.0 ~ 2.0%, Mn 1.0 ~ 2.5%, Mo 0.1 ~ 0.2%, Nb 0.04 ~ 0.06%, P≤0.015%, S≤0.005%, N
≤ 0.006%, remaining is Fe and inevitable impurity；
2nd, by heating steel billet to 1150 ± 50 DEG C, 60 ~ 90min is incubated, then carries out roughing and finish rolling, it is cooled to 550 ~
650 DEG C are batched acquisition hot rolled plate；Wherein roughing start rolling temperature is 1080 ~ 1120 DEG C, and finishing temperature is 980 ~ 1020 DEG C, and roughing is tired out
Product reduction ratio is 50 ~ 70%；Finish rolling start rolling temperature is 940 ~ 970 DEG C, and finishing temperature is 910 ~ 940 DEG C, and finish rolling accumulation reduction ratio is
60~80%；
3rd, hot rolled plate pickling is removed into scale on surface, then carries out cold rolling, cold rolling total reduction is 60 ~ 80%, is obtained
Strip；
The 4th, strip is heated to 750 ~ 850 DEG C in continuous annealing furnace, 60 ~ 180s is incubated, then with 30 ~ 50 DEG C/s speed
Degree is cooled to 220 ~ 270 DEG C, and quenching process is completed during continuous annealing；
5th, the strip for completing quenching is warming up to 450 ~ 470 DEG C with 30 ~ 50 DEG C/s speed, then use temperature for 455 ~
465 DEG C of zinc liquid carries out galvanizing, and the time be 5 ~ 15s, and carbon atom occurs simultaneously during this is enriched with to austenite is not changed, i.e.,
Carbon partition；Normal temperature is cooled to after the completion of galvanizing, obtaining surface has the Q＆P steel of zinc coat.
Cooled down in above-mentioned step 4 in a manner of 30 ~ 50 DEG C/s speed cooling is to use blowing gas.
Above-mentioned zinc liquid composition contains Al 0.205 ~ 0.235%, Fe≤0.03%, Pb≤0.02%, Cd by weight percentage
≤ 0.04%, remaining is Zn.
Yield strength >=550MPa of above-mentioned Q＆P steel, tensile strength >=980MPa, elongation percentage >=25%.
The microscopic structure of above-mentioned Q＆P steel is ferrite+martensite+retained austenite+a small amount of bainite.
Above-mentioned belt steel thickness is 1.0 ~ 1.5mm.
The present invention on the basis of C-Mn composition of steel, suppresses to ooze by rational design of alloy by carrying high Si content
The precipitation of carbon body, Mo addition improve quenching degree, micro Nb addition fining austenite grains；Completed during continuous annealing
The quenching process of Q＆P steel, and enrichment of the carbon atom from martensite to austenite is realized in subsequent hot galvanizing process, i.e. carbon partition
Process, so as to shorten the technological process of production of galvanizing Q＆P steel.
Brief description of the drawings
Fig. 1 is the preparation method schematic flow sheet of the Q＆P steel that carbon partition is completed in hot galvanizing process of the present invention；
Fig. 2 is the micro-organization chart of the Q＆P steel that carbon partition is completed in hot galvanizing process in the embodiment of the present invention 1.
Embodiment
The zinc liquid composition used in the embodiment of the present invention contains Al 0.205 ~ 0.235% by weight percentage, Fe≤0.03%,
Pb≤0.02%, Cd≤0.04%, remaining is Zn.
In the embodiment of the present invention in the matrix of Q＆P steel the volume fraction of retained austenite 9.8 ~ 13.4%.
Cooled down in the embodiment of the present invention in a manner of 30 ~ 50 DEG C/s speed cooling is to use blowing gas.
The thickness of strip is 1.0 ~ 1.5mm in the embodiment of the present invention.
Performance test uses CMT5105 stretching-machines in the embodiment of the present invention.
Tissue detection uses the SEM of FEI Quanta 600 in the embodiment of the present invention.
Embodiment 1
By set component smelting molten steel, steel billet is made in refined and continuous casting；Its composition contains C 0.15% by weight percentage,
Si 2.0%, Mn 1.0%, Mo 0.2%, Nb 0.04%, P 0.014%, S 0.005%, N 0.003%, remaining is Fe and can not kept away
The impurity exempted from；
By heating steel billet to 1150 ± 50 DEG C, 60min is incubated, then carries out roughing and finish rolling, 550 DEG C is cooled to and batches and obtain
Obtain hot rolled plate；Wherein roughing start rolling temperature is 1080 DEG C, and finishing temperature is 980 DEG C, and roughing accumulation reduction ratio is 50%；Finish rolling is opened
Temperature is rolled for 940 DEG C, and finishing temperature is 910 DEG C, and finish rolling accumulation reduction ratio is 60%；
Hot rolled plate pickling is removed into scale on surface, then carries out cold rolling, cold rolling total reduction is 80%, obtains strip；
Strip is heated to 850 DEG C in continuous annealing furnace, 60s is incubated, is then cooled to 270 with 30 DEG C/s speed
DEG C, quenching process is completed during continuous annealing；
The strip for completing quenching is warming up to 470 DEG C with 50 DEG C/s speed, then uses temperature to enter for 455 DEG C of zinc liquid
Row galvanizing, time 15s, carbon atom occurs during this simultaneously to not changing austenite enrichment, i.e. carbon partition；Galvanizing is complete
Normal temperature is cooled to after, obtaining surface has the Q＆P steel of zinc coat, yield strength 556MPa, tensile strength 992MPa, elongation percentage
30.2%, strength and ductility product 30.0GPa%, microscopic structure are ferrite+martensite+retained austenite+a small amount of bainite, as shown in Fig. 2
The wherein volume fraction 9.8% of retained austenite.
Embodiment 2
With embodiment 1, difference is method：
（1）Steel billet composition contains C 0.20%, Si 1.8%, Mn 1.8%, Mo 0.16%, Nb 0.05%, P by weight percentage
0.015%, S 0.003%, N 0.004%, remaining is Fe and inevitable impurity；
（2）By heating steel billet to 1150 ± 50 DEG C, 70min is incubated；550 DEG C are cooled to batch；Wherein roughing start rolling temperature
For 1100 DEG C, finishing temperature is 990 DEG C, and roughing accumulation reduction ratio is 55%；Finish rolling start rolling temperature is 950 DEG C, and finishing temperature is
920 DEG C, finish rolling accumulation reduction ratio is 65%；
（3）Cold rolling total reduction is 75%；
（4）Strip is heated to 820 DEG C in continuous annealing furnace, 90s is incubated, is then cooled to 35 DEG C/s speed
250℃；
（5）The strip for completing quenching is warming up to 460 DEG C with 40 DEG C/s speed, then uses temperature as 460 DEG C of zinc
Liquid carries out galvanizing, time 10s；
（6）The yield strength 560MPa of Q＆P steel, tensile strength 1016MPa, elongation percentage 27.2%, strength and ductility product 27.7GPa%,
The wherein volume fraction 12.5% of retained austenite.
Embodiment 3
With embodiment 1, difference is method：
（1）Steel billet composition contains C 0.25%, Si 1.4%, Mn 2.5%, Mo 0.12%, Nb 0.05%, P by weight percentage
0.012%, S 0.002%, N 0.004%, remaining is Fe and inevitable impurity；
（2）By heating steel billet to 1150 ± 50 DEG C, 80min is incubated；600 DEG C are cooled to batch；Wherein roughing start rolling temperature
For 1110 DEG C, finishing temperature is 1000 DEG C, and roughing accumulation reduction ratio is 65%；Finish rolling start rolling temperature is 960 DEG C, and finishing temperature is
930 DEG C, finish rolling accumulation reduction ratio is 70%；
（3）Cold rolling total reduction is 70%；
（4）Strip is heated to 800 DEG C in continuous annealing furnace, 120s is incubated, is then cooled to 40 DEG C/s speed
230℃；
（5）The strip for completing quenching is warming up to 460 DEG C with 40 DEG C/s speed, then uses temperature as 465 DEG C of zinc
Liquid carries out galvanizing, time 10s；
（6）The yield strength 606MPa of Q＆P steel, tensile strength 1057MPa, elongation percentage 27.1%, strength and ductility product 28.6GPa%,
The wherein volume fraction 12.7% of retained austenite.
Embodiment 4
With embodiment 1, difference is method：
（1）Steel billet composition contains C 0.30%, Si 1.0%, Mn 1.0%, Mo 0.1%, Nb 0.06%, P by weight percentage
0.014%, S 0.004%, N 0.005%, remaining is Fe and inevitable impurity；
（2）By heating steel billet to 1150 ± 50 DEG C, 90min is incubated；650 DEG C are cooled to batch；Wherein roughing start rolling temperature
For 1120 DEG C, finishing temperature is 1020 DEG C, and roughing accumulation reduction ratio is 70%；Finish rolling start rolling temperature is 970 DEG C, and finishing temperature is
940 DEG C, finish rolling accumulation reduction ratio is 60%；
（3）Cold rolling total reduction is 60%；
（4）Strip is heated to 750 DEG C in continuous annealing furnace, 180s is incubated, is then cooled to 50 DEG C/s speed
220℃；
（5）The strip for completing quenching is warming up to 450 DEG C with 30 DEG C/s speed, then uses temperature as 465 DEG C of zinc
Liquid carries out galvanizing, time 5s；
（6）The yield strength 670MPa of Q＆P steel, tensile strength 1073MPa, elongation percentage 26.2%, strength and ductility product 28.1GPa%,
The wherein volume fraction 13.4% of retained austenite.
Claims (2)
1. a kind of preparation method for the Q＆P steel that carbon partition is completed in hot galvanizing process, it is characterised in that carry out according to the following steps：
（1）By set component smelting molten steel, steel billet is made in refined and continuous casting；Its composition by weight percentage containing C 0.15 ~
0.30%, Si 1.0 ~ 2.0%, Mn 1.0 ~ 2.5%, Mo 0.1 ~ 0.2%, Nb 0.04 ~ 0.06%, P≤0.015%, S≤0.005%, N
≤ 0.006%, remaining is Fe and inevitable impurity；
（2）By heating steel billet to 1150 ± 50 DEG C, 60 ~ 90min is incubated, roughing and finish rolling is then carried out, is cooled to 550 ~ 650 DEG C
Batch acquisition hot rolled plate；Wherein roughing start rolling temperature is 1080 ~ 1120 DEG C, and finishing temperature is 980 ~ 1020 DEG C, roughing accumulation pressure
Lower rate is 50 ~ 70%；Finish rolling start rolling temperature be 940 ~ 970 DEG C, finishing temperature be 910 ~ 940 DEG C, finish rolling accumulation reduction ratio be 60 ~
80%；
（3）Hot rolled plate pickling is removed into scale on surface, then carries out cold rolling, cold rolling total reduction is 60 ~ 80%, obtains band
Steel；Described belt steel thickness is 1.0 ~ 1.5mm；
（4）Strip is heated to 750 ~ 850 DEG C in continuous annealing furnace, 60 ~ 180s is incubated, then by the way of blowing gas
Cooling, is cooled to 220 ~ 270 DEG C with 30 ~ 50 DEG C/s speed, quenching process is completed during continuous annealing；
（5）The strip for completing quenching is warming up to 450 ~ 470 DEG C with 30 ~ 50 DEG C/s speed, then uses temperature as 455 ~ 465
DEG C zinc liquid carry out galvanizing, the time be 5 ~ 15s, and carbon atom occurs during this simultaneously and is enriched with to austenite is not changed, be i.e. carbon
Partition；Normal temperature is cooled to after the completion of galvanizing, obtaining surface has the Q＆P steel of zinc coat；The yield strength of described Q＆P steel >=
550MPa, tensile strength >=980MPa, elongation percentage >=25%, microscopic structure are ferrite+martensite+retained austenite+a small amount of shellfish
Family name's body.
2. a kind of preparation method of Q＆P steel that carbon partition is completed in hot galvanizing process according to claim 1, its feature
It is that described zinc liquid composition contains Al 0.205 ~ 0.235%, Fe≤0.03%, Pb≤0.02% by weight percentage, Cd≤
0.04%, remaining is Zn.
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| CN105441849B (en) * | 2015-12-28 | 2018-02-27 | 内蒙古包钢钢联股份有限公司 | Utilize the production method of mild steel raw material production high rigidity galvanized sheet |
| CN109234642B (en) * | 2018-09-30 | 2021-06-01 | 日照钢铁控股集团有限公司 | Ferrite bainite hot-dip galvanized sheet produced based on ESP and PGL production line and production method thereof |
| CN109778075B (en) * | 2019-04-02 | 2020-03-20 | 东北大学 | Preparation method of medium manganese steel material with high yield ratio and continuous yield |
| CN110093491B (en) * | 2019-05-17 | 2020-12-22 | 中冶赛迪工程技术股份有限公司 | Cold-rolled hot-galvanized dual-phase steel and manufacturing method thereof |
| CN110964969B (en) * | 2019-11-27 | 2021-09-21 | 本钢板材股份有限公司 | High-strength hot-dip galvanized quenching distribution steel and production method thereof |
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2015
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Non-Patent Citations (2)
| Title |
|---|
| Microstructure development and mechanical properties of quenching and partitioning (Q&P) steel and an incorporation of hot-dipping galvanization during Q&P process;Jing Sun et al.;《Materials Science & Engineering A》;20130817;第586卷;第101页2.experimental procedure，图1，第106页右栏，第107页5.CONCLUSIONS * |
| 高强度Q&P钢和Q-P-T钢的研究;钟宁;《中国博士学位论文全文数据库 工程科技I辑》;20100115(第1期);第7页，第49-50页，第72-73页 * |
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