CN107083520A - A kind of low-alloy high-strength steel plate and its production method - Google Patents
A kind of low-alloy high-strength steel plate and its production method Download PDFInfo
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- CN107083520A CN107083520A CN201710142782.6A CN201710142782A CN107083520A CN 107083520 A CN107083520 A CN 107083520A CN 201710142782 A CN201710142782 A CN 201710142782A CN 107083520 A CN107083520 A CN 107083520A
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- low
- steel plate
- strength steel
- alloy high
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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
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/02—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of sheets
-
- 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 low-alloy high-strength steel plate and its production method, it includes hot rolling, cold rolling, annealing and smooth process, and the weight/mass percentage composition of the steel plate composition is：C 0.08~0.10%, Mn 0.8~1.0%, Nb 0.045~0.060%, Als 200~500ppm, P≤0.025%, S≤0.010%, N≤50ppm, remaining is iron and inevitable impurity.This steel plate is designed using low-carbon, and the intensity of material is controlled by Mn solution strengthening, Nb precipitation strengths and refined crystalline strengthening；And it is few to be added without precious alloy, alloying element content, the characteristics of with low cost.This method passes through the low cost production of the optimum organization reality of the procedure parameters such as hot-rolling coiling temperature, cold rolling reduction ratio, continuous annealing process annealing temperature, smooth elongation percentage low-alloy high-strength steel；While the high performance low-alloy high-strength steel of production is required to meet the difference of client, cost is reduced, with significant economic benefit.
Description
Technical field
The invention belongs to metal material field, especially a kind of low-alloy high-strength steel plate and its production method.
Background technology
The raising required with vehicle safety performance, more and more using with good strong modeling in body of a motor car manufacture
Long-pending high-strength steel.On the one hand car body weight is mitigated on the premise of vehicle safety performance is not lost；On the other hand reduction automobile is oily
Consumption and reduction environmental pollution；Therefore, use of the high-strength steel in body of a motor car manufacture is more and more, especially in some safety members
In structural member production.And traditional micro-alloyed high strength steel is due to good yield tensile ratio and welding performance, in automobile zero
Still widely used in part manufacture, such steel grade is mainly by adding the solution strengthening elements such as Mn and Si and Nb, V and Ti etc.
Micro alloying element improves the strength of materials, is provided simultaneously with certain forming property；But the cost that also result in such steel is higher.
The content of the invention
The technical problem to be solved in the present invention is to provide a kind of inexpensive low-alloy high-strength steel plate；Present invention also offers
A kind of production method of low-alloy high-strength steel plate.
In order to solve the above technical problems, the weight/mass percentage composition of present component is：C 0.08~0.10%, Mn 0.8~
1.0%, Nb 0.045~0.060%, Als 200~500ppm, P≤0.025%, S≤0.010%, N≤50ppm, remaining is iron
With inevitable impurity.
In the present invention：
C：Carbon is most basic element in steel, and as the interstitial atom in steel, very important work is played to the intensity for improving steel
With the yield strength and tensile strength influence on steel are maximum.Under normal circumstances, the intensity of steel is higher, and elongation percentage is lower, therefore carbon
Content is controlled between 0.08~0.10%.
Mn：Solution strengthening element, ferritic intensity can be improved by typically often adding the Mn of 1% (mass percent) content
40MPa, it is generally the case that the fire check produced for Al killed steel in order to avoid S, generally require by Mn/S control 20 and with
On；Simultaneously during Cooling Austenite Transformation, the transformation to bainite and pearlite can be postponed.
P：In the present invention, P is impurity element, control it is more low better.
Al：Deoxidant element, in order to which effectively deoxidation generally controls Als in 200~500ppm.
N：For objectionable impurities elements, diffusion velocity is fast in the ferrite of room temperature, it is easy to cause room-temperature aging, in order that
Final products have a good forming property, N content control is in 50ppm and following in the present invention.
S：Objectionable impurities elements, it is more low better to control, and present invention control is 0.010% and less.
Nb：For carbide, nitride or carbonitride-forming elements, in hot rolling, recrystallization can be suppressed, hot rolling is refined
And after annealing finished product crystal grain, while can mutually improve the toughness of material by forming precipitated phase, improve intensity.
The inventive method includes hot rolling, cold rolling, annealing and smooth process, and the weight/mass percentage composition of the steel plate composition is as above
It is described.
Hot-rolled process described in the inventive method：1250~1320 DEG C of heating-up temperature, the heat time is 120~180 minutes, heat
It is 870 ± 10 DEG C to roll finishing temperature, and coiling temperature is 560~680 DEG C.
Cold rolling process described in the inventive method：Cold rolling reduction ratio control is 50~80%.
Annealing operation described in the inventive method：Annealing soak temperature is 730~820 DEG C, and soaking time is 60~250s；It hurry up
Cold start temperature is 670 ± 30 DEG C, and overaging temperature is 350 ± 50 DEG C, finally enters water cooling.
Smooth process described in the inventive method：Using smooth elongation control pattern, smooth elongation percentage is 1.0~1.5%.
It is using the beneficial effect produced by above-mentioned technical proposal：The present invention passes through Mn solid solution using low-carbon design
Reinforcing, Nb precipitation strengths and refined crystalline strengthening control the intensity of material；And it is few to be added without precious alloy, alloying element content,
The characteristics of with low cost.
The inventive method was waited by hot-rolling coiling temperature, cold rolling reduction ratio, continuous annealing process annealing temperature, smooth elongation percentage
The real low cost production of low-alloy high-strength steel of the optimum organization of journey parameter；Producing high performance low-alloy high-strength steel to meet
While the difference of client is required, cost is reduced, with significant economic benefit.
Embodiment
With reference to specific embodiment, the present invention is further detailed explanation.
Embodiment 1-8：The production method of this low-alloy high-strength steel plate include steel-making, LF refining, continuous casting, hot rolling, it is cold rolling and
Continuous annealing process, the technique of each operation is as described below.
（1）Steel making working procedure：Using 100 tons of top and bottom combined blown converter, by bessemerizing in reduction carbon and phosphorus, tapping process
Pushing off the slag is carried out using mop, using sial complex deoxidization, manganese and niobium are configured to middle limit.
（2）LF stoves are refined and continuous casting working procedure：The FeO added in lime, the progress slag making deoxidization desulfuration operation of magnalium calcium iron, slag
+ MnO mass percents content is less than 1%, adds ferro-niobium and metal ferromanganese is finely adjusted to composition, while Calcium treatment is carried out, to folder
Debris is denatured, quiet after Calcium treatment to blow 7~15 minutes, help inclusion floating, continuous casting working procedure casting rate be 1.0~
1.5m/min, slab thickness is 230mm, and superheat of liquid steel is controlled at 15~30 DEG C；The weight/mass percentage composition of gained strand composition
For：C 0.08~0.10%, Mn 0.8~1.0%, Nb 0.045~0.060%, Als 200~500ppm, P≤0.025%, S≤
0.010%, N≤50ppm, remaining is iron and inevitable impurity.The specific composition proportion of strand of each embodiment is shown in Table 1.
Table 1：The chemical composition of each embodiment（wt%）
In table 1, surplus is iron and inevitable impurity.
（3）Hot rolling and cold rolling process：In hot-rolled process, 1250~1320 DEG C of heating-up temperature, the heat time is 120~180
Minute, hot rolling finishing temperature is 870 ± 10 DEG C, and coiling temperature is 560~680 DEG C.Cold rolling reduction ratio control in cold rolling process
50~80%.The specific process parameter of hot rolling and cold rolling process is shown in Table 2 in each embodiment
Table 2：Hot rolling and the technological parameter of cold rolling process
（4）Annealing and smooth process：In annealing operation, annealing soak temperature is 730~820 DEG C, and soaking time is 60~250s,
Rapid cooling start temperature is 670 ± 30 DEG C, and overaging temperature is 350 ± 50 DEG C, finally enters to be water-cooled to room temperature.Smooth process is used
Smooth elongation control pattern, smooth elongation percentage 1.0~1.5%.The specific process parameter of each embodiment annealing and smooth process is shown in
Table 3.
Table 3：Annealing and the technological parameter of smooth process
Thickness in table 3 refers to the thickness of steel plate obtained by annealing operation.
（5）After testing, the mechanical performance of high-strength steel sheet is shown in Table 4 obtained by each embodiment.
Table 4：The mechanical performance of high-strength steel sheet
From table 4, the performance of high-strength steel sheet is stable obtained by this method.
Claims (6)
1. a kind of low-alloy high-strength steel plate, it is characterised in that the weight/mass percentage composition of its composition is：C 0.08~0.10%, Mn
0.8~1.0%, Nb 0.045~0.060%, Als 200~500ppm, P≤0.025%, S≤0.010%, N≤50ppm, remaining
For iron and inevitable impurity.
2. a kind of production method of low-alloy high-strength steel plate, it is characterised in that：It includes hot rolling, cold rolling, annealing and smooth process,
The weight/mass percentage composition of the steel plate composition is：C 0.08~0.10%, Mn 0.8~1.0%, Nb 0.045~0.060%, Als
200~500ppm, P≤0.025%, S≤0.010%, N≤50ppm, remaining is iron and inevitable impurity.
3. a kind of production method of low-alloy high-strength steel plate according to claim 3, it is characterised in that the Hot-roller
Sequence：1250~1320 DEG C of heating-up temperature, the heat time is 120~180 minutes, and hot rolling finishing temperature is 870 ± 10 DEG C, batches temperature
Spend for 560~680 DEG C.
4. a kind of production method of low-alloy high-strength steel plate according to claim 3, it is characterised in that the Cold-roller
Sequence：Cold rolling reduction ratio control is 50~80%.
5. a kind of production method of low-alloy high-strength steel plate according to claim 3, it is characterised in that the lehr attendant
Sequence：Annealing soak temperature is 730~820 DEG C, and soaking time is 60~250s；Rapid cooling start temperature is 670 ± 30 DEG C, overaging
Temperature is 350 ± 50 DEG C, finally enters water cooling.
6. a kind of production method of low-alloy high-strength steel plate according to claim 2-5 any one, it is characterised in that
The smooth process：Using smooth elongation control pattern, smooth elongation percentage is 1.0~1.5%.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710142782.6A CN107083520A (en) | 2017-03-10 | 2017-03-10 | A kind of low-alloy high-strength steel plate and its production method |
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| CN201710142782.6A CN107083520A (en) | 2017-03-10 | 2017-03-10 | A kind of low-alloy high-strength steel plate and its production method |
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| CN201710142782.6A Pending CN107083520A (en) | 2017-03-10 | 2017-03-10 | A kind of low-alloy high-strength steel plate and its production method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107904478A (en) * | 2017-10-12 | 2018-04-13 | 首钢集团有限公司 | Reduce the manufacture method of cold rolling low-alloy high-strength steel ferritic-pearlitic type segregation |
| CN109576467A (en) * | 2019-01-08 | 2019-04-05 | 邯郸钢铁集团有限责任公司 | Improve the control method of the logical volume performance uniformity of low-alloy high-strength steel containing Nb |
| CN109735768A (en) * | 2019-02-15 | 2019-05-10 | 邯郸钢铁集团有限责任公司 | A kind of 650MPa level low alloy high-strength steel and its production method |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105714186A (en) * | 2016-04-01 | 2016-06-29 | 唐山钢铁集团有限责任公司 | Continuous annealing low-alloy and high-strength steel plate and production method thereof |
| CN105950967A (en) * | 2016-06-30 | 2016-09-21 | 唐山钢铁集团有限责任公司 | Method for producing 500MPa level low alloy and high strength steel |
-
2017
- 2017-03-10 CN CN201710142782.6A patent/CN107083520A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105714186A (en) * | 2016-04-01 | 2016-06-29 | 唐山钢铁集团有限责任公司 | Continuous annealing low-alloy and high-strength steel plate and production method thereof |
| CN105950967A (en) * | 2016-06-30 | 2016-09-21 | 唐山钢铁集团有限责任公司 | Method for producing 500MPa level low alloy and high strength steel |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107904478A (en) * | 2017-10-12 | 2018-04-13 | 首钢集团有限公司 | Reduce the manufacture method of cold rolling low-alloy high-strength steel ferritic-pearlitic type segregation |
| CN109576467A (en) * | 2019-01-08 | 2019-04-05 | 邯郸钢铁集团有限责任公司 | Improve the control method of the logical volume performance uniformity of low-alloy high-strength steel containing Nb |
| CN109576467B (en) * | 2019-01-08 | 2021-03-09 | 邯郸钢铁集团有限责任公司 | Control method for improving uniformity of coiling performance of Nb-containing low-alloy high-strength steel |
| CN109735768A (en) * | 2019-02-15 | 2019-05-10 | 邯郸钢铁集团有限责任公司 | A kind of 650MPa level low alloy high-strength steel and its production method |
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Application publication date: 20170822 |