CN105506453A - Novel low-cost S355JR/J0 low alloy steel plate and production method thereof - Google Patents
Novel low-cost S355JR/J0 low alloy steel plate and production method thereof Download PDFInfo
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- CN105506453A CN105506453A CN201510960333.3A CN201510960333A CN105506453A CN 105506453 A CN105506453 A CN 105506453A CN 201510960333 A CN201510960333 A CN 201510960333A CN 105506453 A CN105506453 A CN 105506453A
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- steel plate
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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
- C22C38/02—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
- C21D8/0221—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
- 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
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
-
- 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
Abstract
The invention discloses a novel low-cost S355JR/J0 low alloy steel plate and a production method thereof. The novel low-cost S355JR/J0 low alloy steel plate comprises the following chemical components in percentage by mass (unit, wt%): 0.15-0.18 of C, 0.20-0.40 of Si, 0.5-0.8 of Mn, P not more than 0.020, S not more than 0.020, 0.010-0.040 of Als, 0.035-0.055 of Ti, 0.31-0.39 of Cr, and the balance of Fe and residual elements. In order to realize the steel plate, the production method comprises the steps of converter smelting, continuous casting, casting blank slow cooling, heating, TMCP and slow cooling. Through novel composite microalloying component design thought and simple and effective process flow design, such indexes as mechanical performance and ultrasonic flow detection of the steel plate are guaranteed; the cost of ton of steel is saved by 60-70 yuan/t; the export rebate requirement is satisfied; and the promotion meaning is excellent.
Description
Technical field
The present invention relates to continuous casting and produce plate of moderate thickness field, be specifically related to a kind of novel low-cost S355JR/S355J0 Low Alloy Steel Plate and production method thereof.
Background technology
Specification 16 ~ 100mmS355JR/J0 is a kind of conventional low-alloy high-strength steel plate, it has higher intensity, good cold deformation ability, good plasticity and toughness, be widely used in all kinds of welding structural element and mechanical component, along with the continuous reduction of steel industry profit, inside tap the latent power reduce ton steel cost extremely urgent.
Summary of the invention
For the problems referred to above, the present inventor, through groping, obtains a kind of specification 16 ~ 100mm guaranteed cost of low cost production, protects the S355JR/J0 Low Alloy Steel Plate of flaw detection, thus complete the present invention.
Therefore, the object of the present invention is to provide a kind of low cost specification 16 ~ 100mm guaranteed cost, protect the Composition Design thinking of the S355JR/J0 Low Alloy Steel Plate of flaw detection.
Another object of the present invention is to the production method that this low cost steel plate is provided.
For reaching above-mentioned first object, within the scope of national standard, and when not affecting end product quality, utilizing Ti alloying element with low cost to replace the higher Mn alloying element of a part of cost, significantly reducing ton steel cost, expand product profit space.
The technical scheme novel low-cost S355JR/S355J0 Low Alloy Steel Plate that the present invention takes comprises the chemical composition (unit, wt%) of following mass percent:
C:0.15 ~ 0.18, Si:0.20 ~ 0.40, Mn:0.5 ~ 0.8, P :≤0.020, S :≤0.020, Als:0.010 ~ 0.040, Ti:0.035 ~ 0.055, Cr:0.31 ~ 0.39, other is Fe and relict element.
The function analysis of above-mentioned chemical element is as follows:
C: be most basic strengthening element in steel, improves intensity, but C affects the welding property of steel and affects toughness.Si: be solution strengthening element, favourable to the intensity improving steel plate.Mn: be solution strengthening element, all favourable to the intensity and toughness improving steel plate, but improve carbon equivalent.P: unfavorable to welding, and there is certain cold shortness, in this steel grade, belong to harmful element, what should control is as far as possible low.S: easily form MnS type impurity, have certain red brittleness, belong to harmful element in this steel grade, what should control is as far as possible low.Al: grain refining intensificatiom effect can be played.Ti: can be combined with C, N in steel, form fine carbide or carbonitride, crystal grain thinning and dispersion-strengthened action can be played, thus reach the effect of the intensity effectively improving steel, because of Ti/C≤4 of present component design, the nitride of carbon and sulfide can not be formed and cause the embrittlement of steel on crystal boundary, causing the impact toughness decreased of steel plate.Cr: chromium and iron form continuous solid solution, reduce territory, austenite phase field, significantly improve intensity and hardening capacity, improves armor plate strength and has good wear resisting property.
For achieving the above object, the production method that the present invention takes comprises: converter smelting, continuous casting, strand slow cooling, heating, TMCP, slow cooling.
1, in described converter smelting, tapping carbon 0.04 ~ 0.08%, tapping P≤0.012%, S≤0.005%; Point blows number of times and must not be greater than 2 times, avoids tapping process slag;
2, after converter tapping during alloying, ferro-titanium added before aluminum steel, in advance fix N element, reduces and the AlN of crackle may be caused to be formed, Argon 3 minutes, soft blow argon >=8 minute by force before leaving from station;
3, adopt continuous casting protection pouring, cast superheating temperature controls at 10 ~ 25 DEG C, and permanent pulling rate cast, enters burial pit slow cooling 12 hours after continuously cast bloom cutting;
4, hanker in described adding, heat-up time 1.3min/mm, the holding temperature of soaking zone controls at 1240 DEG C ~ 1260 DEG C;
5, in described TMCP, start rolling temperature 1050 DEG C ~ 1120 DEG C; One-phase finishing temperature is at 950 DEG C ~ 1000 DEG C, and two-stage start rolling temperature is at 850 ~ 880 DEG C, and dry in the air steel thickness 1.5 ~ 2 times, and the two-stage takes little pressure rolling, and finish rolling adds up draft > 45%, finishing temperature 820 ~ 850 DEG C; Red temperature 650 ~ 750 DEG C, cooling rate controls at 3 ~ 8 DEG C/s;
6, in described slow cooling, burial pit temperature 200 ~ 400 DEG C is entered; Heap cool time 20 hours.
By above novel combined microalloying Composition Design thinking and brief effective process design, ensure that the indexs such as the mechanical property of steel plate, UT (Ultrasonic Testing); Ton steel is cost-saving at 60 ~ 70 yuan/ton; Meet export tax rebate requirement simultaneously, be with the promotion of good sense.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the present invention is further elaborated.
Fig. 1 is present invention process schema.
Embodiment
Novel low-cost S355JR/S355J0 Low Alloy Steel Plate of the present invention comprises the chemical composition (unit, wt%) of following mass percent:
C:0.15 ~ 0.18, Si:0.20 ~ 0.40, Mn:0.5 ~ 0.8, P :≤0.020, S :≤0.020, Als:0.010 ~ 0.040, Ti:0.035 ~ 0.055, Cr:0.31 ~ 0.39, other is Fe and relict element.
The Composition Design scheme that the present invention takes is as following table 1:
Table 1 conventional components and present component contrast (unit, wt%)
| Element | C | Si | Mn | P | S | Als | Ti | Cr |
| Conventional components | 0.13～0.18 | 0.20～0.40 | 1.40～1.60 | ≤0.020 | ≤0.020 | 0.010～0.040 | 0.01～0.02 | ≤0.10 |
| Present component | 0.15～0.18 | 0.20～0.40 | 0.5～0.8 | ≤0.020 | ≤0.020 | 0.010～0.040 | 0.035～0.055 | 0.31～0.39 |
For obtaining the said products, the production method that the present invention takes comprises: converter smelting, continuous casting, strand slow cooling, heating, TMCP, slow cooling.
1, in described converter smelting, tapping carbon 0.04 ~ 0.08%, tapping P≤0.012%, S≤0.005%; Point blows number of times and must not be greater than 2 times, avoids tapping process slag;
2, after converter tapping during alloying, ferro-titanium added before aluminum steel, in advance fix N element, reduces and the AlN of crackle may be caused to be formed, Argon 3 minutes, soft blow argon >=8 minute by force before leaving from station;
3, adopt continuous casting protection pouring, cast superheating temperature controls at 10 ~ 25 DEG C, and permanent pulling rate cast, enters burial pit slow cooling 12 hours after continuously cast bloom cutting;
4, hanker in described adding, heat-up time 1.3min/mm, the holding temperature of soaking zone controls at 1240 DEG C ~ 1260 DEG C;
5, in described TMCP, start rolling temperature 1050 DEG C ~ 1120 DEG C; One-phase finishing temperature is at 950 DEG C ~ 1000 DEG C, and two-stage start rolling temperature is at 850 ~ 880 DEG C, and dry in the air steel thickness 1.5 ~ 2 times, and the two-stage takes little pressure rolling, and finish rolling adds up draft > 45%, finishing temperature 820 ~ 850 DEG C; Red temperature 650 ~ 750 DEG C, cooling rate controls at 3 ~ 8 DEG C/s;
6, in described slow cooling, burial pit temperature 200 ~ 400 DEG C is entered; Heap cool time 20 hours.
By above novel combined microalloying Composition Design thinking and brief effective process design, ensure that the indexs such as the mechanical property of steel plate, UT (Ultrasonic Testing); Ton steel is cost-saving at 60 ~ 70 yuan/ton; Meet export tax rebate requirement simultaneously, be with the promotion of good sense.
Claims (2)
1. a novel low-cost S355JR/S355J0 Low Alloy Steel Plate, this low cost S 355JR/J0 Low Alloy Steel Plate comprises the chemical composition of following mass percent: C:0.15 ~ 0.18, Si:0.20 ~ 0.40, Mn:0.5 ~ 0.8, P :≤0.020, S :≤0.020, Als:0.010 ~ 0.040, Ti:0.035 ~ 0.055, Cr:0.31 ~ 0.39, and other is Fe and relict element.
2. a production method for novel low-cost S355JR/S355J0 Low Alloy Steel Plate as claimed in claim 1, this production method comprises: converter smelting, continuous casting, strand slow cooling, heating, TMCP, slow cooling; It is characterized in that in described converter smelting, tapping carbon 0.04 ~ 0.08%, tapping P≤0.012%, S≤0.005%; Point blows number of times and must not be greater than 2 times, avoids tapping process slag; After converter tapping during alloying, ferro-titanium added before aluminum steel, in advance fix N element, reduces and the AlN of crackle may be caused to be formed, strong Argon 3 minutes, soft blow argon >=8 minute before leaving from station; Adopt continuous casting protection pouring, cast superheating temperature controls at 10 ~ 25 DEG C, and permanent pulling rate cast, enters burial pit slow cooling 12 hours after continuously cast bloom cutting; Hanker in described adding, heat-up time 1.3min/mm, the holding temperature of soaking zone controls at 1240 DEG C ~ 1260 DEG C; In described TMCP, start rolling temperature 1050 DEG C ~ 1120 DEG C; One-phase finishing temperature is at 950 DEG C ~ 1000 DEG C, and two-stage start rolling temperature is at 850 ~ 880 DEG C, and dry in the air steel thickness 1.5 ~ 2 times, and the two-stage takes little pressure rolling, and finish rolling adds up draft > 45%, finishing temperature 820 ~ 850 DEG C; Red temperature 650 ~ 750 DEG C, cooling rate controls at 3 ~ 8 DEG C/s; In described slow cooling, enter burial pit temperature 200 ~ 400 DEG C; Heap cool time 20 hours.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107747058A (en) * | 2017-11-30 | 2018-03-02 | 攀钢集团攀枝花钢铁研究院有限公司 | Steel Bar and its production method are built containing Ti, Cr microalloy |
| CN111763878A (en) * | 2020-05-29 | 2020-10-13 | 河北普阳钢铁有限公司 | Production method of 6mm S355JR steel plate |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107747058A (en) * | 2017-11-30 | 2018-03-02 | 攀钢集团攀枝花钢铁研究院有限公司 | Steel Bar and its production method are built containing Ti, Cr microalloy |
| CN111763878A (en) * | 2020-05-29 | 2020-10-13 | 河北普阳钢铁有限公司 | Production method of 6mm S355JR steel plate |
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Application publication date: 20160420 |