CN107164700A - A kind of 800MPa grades of high-yield-ratio cold-rolled strip and its manufacture method - Google Patents
A kind of 800MPa grades of high-yield-ratio cold-rolled strip and its manufacture method Download PDFInfo
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- CN107164700A CN107164700A CN201710390994.6A CN201710390994A CN107164700A CN 107164700 A CN107164700 A CN 107164700A CN 201710390994 A CN201710390994 A CN 201710390994A CN 107164700 A CN107164700 A CN 107164700A
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- yield
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- 800mpa
- ratio cold
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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
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
-
- 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
-
- 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
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—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
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
Abstract
The invention discloses a kind of 800MPa grades of high-yield-ratio cold-rolled strip and its manufacture method, steel band chemical composition composition and weight/mass percentage composition are：C：0.05~0.08%, Si≤0.15%, Mn：1.60~1.90%, P≤0.020%, S≤0.008%, Als：0.020~0.060%, Nb：0.045~0.065%, Ti：0.090~0.110%, Mo：0.15~0.20%, N≤0.0050%, remaining is iron and inevitable impurity；Manufacture method includes the smooth processes of Lian Zhu ﹑ Re Lian Zha ﹑ Suan Zha ﹑ Lian Tui ﹑.The present invention by rational composition design and match hot rolling, acid roll, continuous annealing process, the thickness of strips of production is 1.0~2.0mm, and yield strength >=800MPa, tensile strength >=850MPa, A80 >=8%, 180 ° of bending of elongation percentage is not opened.
Description
Technical field
The invention belongs to metallurgical technology field, and in particular to a kind of 800MPa grades of high-yield-ratio cold-rolled strip and its manufacturer
Method.
Background technology
At present, replace steel plate using the sheet metal of higher intensity, realize automobile loss of weight, it is energy-saving be automobile steel iron
The Main Trends of The Development of material.By taking the cold rolling low-alloy high-strength steel of high-yield-ratio type as an example, yield strength 260- is developed successively
500MPa high-strength steel series, but the report of the cold rolling low-alloy high-strength steel of high-yield-ratio type of higher intensity rank is more rare.
The B of patent CN 103866182 disclose it is a kind of based on bell-type annealing processing 700MPa level cold rolling high strength steels and
The low-cost manufacture method of thin steel strip, annealing way is bell-type annealing, is unfavorable for the control of strip surface quality, while using two
Secondary cold rolling, production procedure is long；
The B of patent CN 103882320 disclose a kind of stretch flangeability and the excellent high strength cold rolled steel plate of spot weldability and its system
Method is made, is related to steel plate tensile strength >=800MPa, yield strength 550-650MPa, yield tensile ratio is low, fast for continuous annealing line
Cold section of cooling rate requires high, and technology controlling and process is harsh；
The B of patent CN 101956139 disclose a kind of yield strength 700MPa grade high-strength cold-rolled steel sheets and preparation method thereof, relate to
And steel plate yield strength >=700MPa, hence it is evident that less than armor plate strength rank disclosed in this patent.
The content of the invention
The technical problem to be solved in the present invention is to provide a kind of 800MPa grades of high-yield-ratio cold-rolled strip；The present invention is also provided
A kind of manufacture method of 800MPa grades of high-yield-ratio cold-rolled strip.
In order to solve the above technical problems, the present invention is adopted the technical scheme that：A kind of 800MPa grades of high-yield-ratio cold-rolled steel
Band, the steel band chemical composition composition and weight/mass percentage composition are：C：0.05~0.08%, Si≤0.15%, Mn：1.60~
1.90%, P≤0.020%, S≤0.008%, Als：0.020~0.060%, Nb：0.045~0.065%, Ti：0.090~
0.110%, Mo：0.15~0.20%, N≤0.0050%, remaining is iron and inevitable impurity.
Thickness of strips specification of the present invention is 1.0~2.0mm.
Steel band mechanical property of the present invention：Yield strength >=800MPa, tensile strength >=850MPa, elongation percentage A80 >=
8%, 180 ° of bendings are not ftractureed.
Present invention also offers a kind of manufacture method of 800MPa grades of high-yield-ratio cold-rolled strip, methods described includes connecting
The smooth processes of Zhu ﹑ Re Lian Zha ﹑ Suan Zha ﹑ Lian Tui ﹑.
Continuous casting working procedure of the present invention, slab thickness is 180-220mm.
Hot continuous rolling process of the present invention, slab heating temperature is 1250-1300 DEG C, time inside furnace 200-240min, eventually
Roll 850-890 DEG C of temperature, 560-600 DEG C of coiling temperature.
Acid of the present invention rolls process, and acid rolls reduction ratio >=55%.
Continuous annealing process of the present invention, soaking temperature is 760~780 DEG C, soaking time 90-140s, slow cooling section cooling rate 2-8
DEG C/s, slow cooling end temp is 680~720 DEG C.
Continuous annealing process of the present invention, rapid cooling section 20-40 DEG C of cooling rate/s, rapid cooling end temp is 380~420 DEG C, timeliness
Duan Wendu is 350~390 DEG C.
Smooth process of the present invention, smooth elongation percentage point specifications control is 0.5~0.8%.
The detection method of 800MPa grades of high-yield-ratio cold-rolled strip of the present invention refers to GB/T228 and GB/T232.
It is using the beneficial effect produced by above-mentioned technical proposal：1st, the present invention uses low-carbon, Nb, Ti microalloying,
The composition design thinking of Si, Mn solution strengthening, while adding the hair that a certain amount of Mo promotes Nb, Ti carbonitride invigoration effect
Wave, by rational composition design and match corresponding hot rolling, acid roll, continuous annealing process there is provided a kind of simple production process and easily
In the manufacture method of the 800MPa level high-yield-ratio cold-rolled strips of control, product has high intensity concurrently and good plasticity.2nd, this hair
Bright cold-rolled strip thickness specification be 1.0~2.0mm, yield strength >=800MPa, tensile strength >=850MPa, elongation percentage A80 >=
8%, 180 ° of bendings are not ftractureed.
Embodiment
The manufacture method of 800MPa grades of high-yield-ratio cold-rolled strips uses following processing steps：
（1）Continuous casting working procedure：Slab thickness 180-220mm；
（2）Hot continuous rolling process：1250-1300 DEG C of slab heating temperature, time inside furnace 200-240min, finishing temperature 850-880
DEG C, 560-590 DEG C of coiling temperature；
（3）Acid rolls process：Acid rolls reduction ratio >=55%；
（4）Continuous annealing process：760~780 DEG C of soaking temperature, soaking time 90-140s, 2-8 DEG C of slow cooling section cooling rate/s, slow cooling terminates
680~720 DEG C of temperature, rapid cooling section 20-40 DEG C of cooling rate/s, 380~420 DEG C of rapid cooling end temp, aging section temperature 350~390
℃；
（5）Smooth process：Smooth elongation percentage point specifications control is 0.5~0.8%.
With reference to specific embodiment, the present invention is further detailed explanation.
Embodiment 1
800MPa grades of high-yield-ratio cold-rolled strip thickness of the present embodiment are 1.0mm, and steel band chemical composition composition and quality percentage contain
Amount is shown in Table 1.
Manufacture method includes the smooth processes of Lian Zhu ﹑ Re Lian Zha ﹑ Suan Zha ﹑ Lian Tui ﹑, and concrete technology step is as follows：
（1）Continuous casting working procedure：Slab thickness 195mm；
（2）Hot continuous rolling process：1250 DEG C of slab heating temperature, time inside furnace 228min, 865 DEG C of finishing temperature, coiling temperature 560
℃；
（3）Acid rolls process：Acid rolls reduction ratio 66%；
（4）Continuous annealing process：765 DEG C of soaking temperature, soaking time 99s, 6 DEG C/s of slow cooling section cooling rate, 695 DEG C of slow cooling end temp,
Rapid cooling section 36 DEG C/s of cooling rate, 405 DEG C of rapid cooling end temp, 350 DEG C of aging section temperature；
（5）Smooth process：Smooth elongation percentage is 0.5%.
Steel band mechanical property is shown in Table 2.
Embodiment 2
800MPa grades of high-yield-ratio cold-rolled strip thickness of the present embodiment are 1.2mm, and steel band chemical composition composition and quality percentage contain
Amount is shown in Table 1.
Manufacture method includes the smooth processes of Lian Zhu ﹑ Re Lian Zha ﹑ Suan Zha ﹑ Lian Tui ﹑, and concrete technology step is as follows：
（1）Continuous casting working procedure：Slab thickness 180mm；
（2）Hot continuous rolling process：1280 DEG C of slab heating temperature, time inside furnace 240min, 855 DEG C of finishing temperature, coiling temperature 575
℃；
（3）Acid rolls process：Acid rolls reduction ratio 60%；
（4）Continuous annealing process：760 DEG C of soaking temperature, soaking time 99s, 6 DEG C/s of slow cooling section cooling rate, 680 DEG C of slow cooling end temp,
Rapid cooling section 38 DEG C/s of cooling rate, 380 DEG C of rapid cooling end temp, 370 DEG C of aging section temperature；
（5）Smooth process：Smooth elongation percentage is 0.5%.
Steel band mechanical property is shown in Table 2.
Embodiment 3
800MPa grades of high-yield-ratio cold-rolled strip thickness of the present embodiment are 1.4mm, and steel band chemical composition composition and quality percentage contain
Amount is shown in Table 1.
Manufacture method includes the smooth processes of Lian Zhu ﹑ Re Lian Zha ﹑ Suan Zha ﹑ Lian Tui ﹑, and concrete technology step is as follows：
（1）Continuous casting working procedure：Slab thickness 205mm；
（2）Hot continuous rolling process：1275 DEG C of slab heating temperature, time inside furnace 221min, 850 DEG C of finishing temperature, coiling temperature 580
℃；
（3）Acid rolls process：Acid rolls reduction ratio 60%；
（4）Continuous annealing process：772 DEG C of soaking temperature, soaking time 119s, 4 DEG C/s of slow cooling section cooling rate, 705 DEG C of slow cooling end temp,
Rapid cooling section 33 DEG C/s of cooling rate, 388 DEG C of rapid cooling end temp, 365 DEG C of aging section temperature；
（5）Smooth process：Smooth elongation percentage is 0.6%.
Steel band mechanical property is shown in Table 2.
Embodiment 4
800MPa grades of high-yield-ratio cold-rolled strip thickness of the present embodiment are 1.6mm, and steel band chemical composition composition and quality percentage contain
Amount is shown in Table 1.
Manufacture method includes the smooth processes of Lian Zhu ﹑ Re Lian Zha ﹑ Suan Zha ﹑ Lian Tui ﹑, and concrete technology step is as follows：
（1）Continuous casting working procedure：Slab thickness 208mm；
（2）Hot continuous rolling process：1300 DEG C of slab heating temperature, time inside furnace 205min, 870 DEG C of finishing temperature, coiling temperature 565
℃；
（3）Acid rolls process：Acid rolls reduction ratio 55%；
（4）Continuous annealing process：770 DEG C of soaking temperature, soaking time 90s, 2 DEG C/s of slow cooling section cooling rate, 710 DEG C of slow cooling end temp,
Rapid cooling section 20 DEG C/s of cooling rate, 398 DEG C of rapid cooling end temp, 385 DEG C of aging section temperature；
（5）Smooth process：Smooth elongation percentage is 0.6%.
Steel band mechanical property is shown in Table 2.
Embodiment 5
800MPa grades of high-yield-ratio cold-rolled strip thickness of the present embodiment are 1.8mm, and steel band chemical composition composition and quality percentage contain
Amount is shown in Table 1.
Manufacture method includes the smooth processes of Lian Zhu ﹑ Re Lian Zha ﹑ Suan Zha ﹑ Lian Tui ﹑, and concrete technology step is as follows：
（1）Continuous casting working procedure：Slab thickness 220mm；
（2）Hot continuous rolling process：1285 DEG C of slab heating temperature, time inside furnace 216min, 880 DEG C of finishing temperature, coiling temperature 575
℃；
（3）Acid rolls process：Acid rolls reduction ratio 55%；
（4）Continuous annealing process：780 DEG C of soaking temperature, soaking time 140s, 8 DEG C/s of slow cooling section cooling rate, 720 DEG C of slow cooling end temp,
Rapid cooling section 40 DEG C/s of cooling rate, 420 DEG C of rapid cooling end temp, 390 DEG C of aging section temperature；（5）Smooth process：Smooth elongation percentage is
0.7%。
Steel band mechanical property is shown in Table 2.
Embodiment 6
800MPa grades of high-yield-ratio cold-rolled strip thickness of the present embodiment are 2.0mm, and steel band chemical composition composition and quality percentage contain
Amount is shown in Table 1.
Manufacture method includes the smooth processes of Lian Zhu ﹑ Re Lian Zha ﹑ Suan Zha ﹑ Lian Tui ﹑, and concrete technology step is as follows：
（1）Continuous casting working procedure：Slab thickness 212mm；
（2）Hot continuous rolling process：1280 DEG C of slab heating temperature, time inside furnace 200min, 875 DEG C of finishing temperature, coiling temperature 590
℃；
（3）Acid rolls process：Acid rolls reduction ratio 55%；
（4）Continuous annealing process：771 DEG C of soaking temperature, soaking time 132s, 5 DEG C/s of slow cooling section cooling rate, 685 DEG C of slow cooling end temp,
Rapid cooling section 26 DEG C/s of cooling rate, 410 DEG C of rapid cooling end temp, 375 DEG C of aging section temperature；
（5）Smooth process：Smooth elongation percentage is 0.8%.
Steel band mechanical property is shown in Table 2.
The embodiment 1-6 steel bands chemical composition of table 1 is constituted and its weight/mass percentage composition（%）
The embodiment 1-6 steel band mechanical properties of table 2
Above example is only used to illustrative and not limiting technical scheme, although entering with reference to above-described embodiment to the present invention
Go detailed description, it will be understood by those within the art that：Still the present invention can be modified or equally replaced
Change, any modification or partial replacement without departing from the spirit and scope of the present invention, it all should cover will in right of the invention
Ask among scope.
Claims (10)
1. a kind of 800MPa grades of high-yield-ratio cold-rolled strip, it is characterised in that the steel band chemical composition composition and quality percentage
Content is：C：0.05~0.08%, Si≤0.15%, Mn：1.60~1.90%, P≤0.020%, S≤0.008%, Als：0.020~
0.060%, Nb：0.045~0.065%, Ti：0.090~0.110%, Mo：0.15~0.20%, N≤0.0050%, remaining be iron and
Inevitable impurity.
2. a kind of 800MPa grades of high-yield-ratio cold-rolled strips according to claim 1, it is characterised in that the thickness of strips
Specification is 1.0~2.0mm.
3. a kind of 800MPa grades of high-yield-ratio cold-rolled strips according to claim 1, it is characterised in that the steel band mechanics
Performance：Yield strength >=800MPa, tensile strength >=850MPa, A80 >=8%, 180 ° of bending of elongation percentage is not ftractureed.
4. based on a kind of manufacture method of 800MPa grades of high-yield-ratio cold-rolled strips described in claim 1-3 any one, its
It is characterised by, methods described includes the smooth processes of Lian Zhu ﹑ Re Lian Zha ﹑ Suan Zha ﹑ Lian Tui ﹑.
5. a kind of manufacture method of 800MPa grades of high-yield-ratio cold-rolled strips according to claim 4, it is characterised in that institute
Continuous casting working procedure is stated, slab thickness is 180-220mm.
6. a kind of manufacture method of 800MPa grades of high-yield-ratio cold-rolled strips according to claim 4, it is characterised in that institute
Hot continuous rolling process is stated, slab heating temperature is 1250-1300 DEG C, time inside furnace 200-240min, 850-890 DEG C of finishing temperature,
560-600 DEG C of coiling temperature.
7. a kind of manufacture method of 800MPa grades of high-yield-ratio cold-rolled strips according to claim 4, it is characterised in that institute
State acid and roll process, acid rolls reduction ratio >=55%.
8. a kind of manufacture method of 800MPa grades of high-yield-ratio cold-rolled strips according to claim 4, it is characterised in that institute
Continuous annealing process is stated, soaking temperature is 760~780 DEG C, and soaking time 90-140s, 2-8 DEG C of slow cooling section cooling rate/s, slow cooling terminates temperature
Spend for 680~720 DEG C.
9. a kind of manufacture method of 800MPa grades of high-yield-ratio cold-rolled strips according to claim 4, it is characterised in that institute
Continuous annealing process is stated, rapid cooling section 20-40 DEG C of cooling rate/s, rapid cooling end temp is 380~420 DEG C, aging section temperature is 350~390
℃。
10. a kind of manufacture method of 800MPa grades of high-yield-ratio cold-rolled strips according to claim 4, it is characterised in that
The smooth process, smooth elongation percentage point specifications control is 0.5~0.8%.
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| CN201710390994.6A CN107164700B (en) | 2017-05-27 | 2017-05-27 | A kind of 800MPa grades of high-yield-ratio cold-rolled strip and its manufacturing method |
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| CN201710390994.6A CN107164700B (en) | 2017-05-27 | 2017-05-27 | A kind of 800MPa grades of high-yield-ratio cold-rolled strip and its manufacturing method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108486462A (en) * | 2018-03-31 | 2018-09-04 | 唐山钢铁集团有限责任公司 | Reaming and the excellent high-yield-ratio cold-rolled steel sheet and its production method of bending property |
| CN108531832A (en) * | 2018-03-30 | 2018-09-14 | 鞍钢股份有限公司 | A kind of 800MPa grades of high-yield-ratio cold-rolled steel sheet and its manufacturing method |
| CN109518074A (en) * | 2018-10-10 | 2019-03-26 | 安阳钢铁股份有限公司 | A kind of economical high tenacity 800MPa grades of beam steels and its production method |
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| CN108531832A (en) * | 2018-03-30 | 2018-09-14 | 鞍钢股份有限公司 | A kind of 800MPa grades of high-yield-ratio cold-rolled steel sheet and its manufacturing method |
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| CN109518074A (en) * | 2018-10-10 | 2019-03-26 | 安阳钢铁股份有限公司 | A kind of economical high tenacity 800MPa grades of beam steels and its production method |
| CN109518074B (en) * | 2018-10-10 | 2020-11-06 | 安阳钢铁股份有限公司 | Economical high-toughness 800 MPa-grade automobile girder steel and production method thereof |
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| Publication number | Publication date |
|---|---|
| CN107164700B (en) | 2018-11-09 |
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