CS246304B1 - Hot rolling method of strips 1,5 till 5 mm thick from structural low-carbon steel - Google Patents
Hot rolling method of strips 1,5 till 5 mm thick from structural low-carbon steel Download PDFInfo
- Publication number
- CS246304B1 CS246304B1 CS847408A CS740884A CS246304B1 CS 246304 B1 CS246304 B1 CS 246304B1 CS 847408 A CS847408 A CS 847408A CS 740884 A CS740884 A CS 740884A CS 246304 B1 CS246304 B1 CS 246304B1
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- Czechoslovakia
- Prior art keywords
- strips
- hot rolling
- carbon steel
- steel
- structural low
- Prior art date
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- 229910001209 Low-carbon steel Inorganic materials 0.000 title claims abstract description 5
- 238000005098 hot rolling Methods 0.000 title abstract description 6
- 238000000034 method Methods 0.000 title abstract description 4
- 239000000203 mixture Substances 0.000 claims abstract description 5
- 239000000126 substance Substances 0.000 claims abstract description 5
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 4
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 4
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 4
- 229910052726 zirconium Inorganic materials 0.000 claims abstract description 4
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 claims abstract description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 3
- 229910052684 Cerium Inorganic materials 0.000 claims abstract description 3
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims abstract description 3
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims abstract description 3
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims abstract description 3
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 claims abstract description 3
- 229910052796 boron Inorganic materials 0.000 claims abstract description 3
- GWXLDORMOJMVQZ-UHFFFAOYSA-N cerium Chemical compound [Ce] GWXLDORMOJMVQZ-UHFFFAOYSA-N 0.000 claims abstract description 3
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 3
- 239000011651 chromium Substances 0.000 claims abstract description 3
- 229910052746 lanthanum Inorganic materials 0.000 claims abstract description 3
- FZLIPJUXYLNCLC-UHFFFAOYSA-N lanthanum atom Chemical compound [La] FZLIPJUXYLNCLC-UHFFFAOYSA-N 0.000 claims abstract description 3
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 claims abstract description 3
- 229910052758 niobium Inorganic materials 0.000 claims abstract description 3
- 239000010955 niobium Substances 0.000 claims abstract description 3
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 claims abstract description 3
- 239000011574 phosphorus Substances 0.000 claims abstract description 3
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 3
- 239000010703 silicon Substances 0.000 claims abstract description 3
- 239000011593 sulfur Substances 0.000 claims abstract description 3
- 229910052720 vanadium Inorganic materials 0.000 claims abstract description 3
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 claims abstract description 3
- 238000005096 rolling process Methods 0.000 claims description 5
- 229910052750 molybdenum Inorganic materials 0.000 claims description 3
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 claims description 2
- 239000011733 molybdenum Substances 0.000 claims description 2
- 229910000831 Steel Inorganic materials 0.000 abstract description 7
- 239000010959 steel Substances 0.000 abstract description 7
- 238000000137 annealing Methods 0.000 abstract description 5
- 229910000734 martensite Inorganic materials 0.000 abstract description 4
- 238000001816 cooling Methods 0.000 abstract description 3
- 238000004804 winding Methods 0.000 abstract description 3
- 229910052751 metal Inorganic materials 0.000 abstract description 2
- 239000002184 metal Substances 0.000 abstract description 2
- 229910052714 tellurium Inorganic materials 0.000 abstract 1
- PORWMNRCUJJQNO-UHFFFAOYSA-N tellurium atom Chemical compound [Te] PORWMNRCUJJQNO-UHFFFAOYSA-N 0.000 abstract 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 239000011572 manganese Substances 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000007669 thermal treatment Methods 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
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- Heat Treatment Of Sheet Steel (AREA)
Abstract
Sposob valcovania za tepla, pásov· hrůbky 1,5 až 5 mm z konštrukčnej nízkouhlíkovej ocele rieši problém zvýšenia tvárnitefnosti plechov za studená, pri zachovaní vysokých pevnostných vlastností, prostredníctvom dosiahnutia dvojfázovej feriticko-martenzitickej struktury bez žíhania. Ide o· ocele o chemickom zložení a hmotnostnom obsahu 0,03 až 0,14 % uhlíka, 0,3 až 1,1 kremíka, 0,005 až 0,03 % fosforu, 0,002 až 0,035 % síry, 0,06 ,až 0,2 % zirkonu, 1,6 až 3,0 % mangánu, 0,1 až 0,4 % molyhdénu, stopy až 1,0 % chrómu a ďalej 0,005 až 0,25 % niobu, vanádu, céru, lantánu, bóru a telúru jednotlivo alebo v ich vzájoímnej kombinácii. Podstata riešenia spočívá v tom, že ocel' sa válcuje na pásy pri dovalcovacej teplote od 780 do 880 QC a potom sa na výbehovom úseku intenzívně ochladzuje rýchlosfou v rozsahu od 10 do· 55 °C/sek. až po navíjaciu teplotu od 450 °C do, 560 °C.Method of hot rolling, belts 1.5 to 5 mm of structural low carbon steel solves the problem of increasing ductility sheet metal cold, keeping high strength properties, through achievement two-phase ferritic-martensitic structure without annealing. These are steel chemical composition and weight content 0.03 to 0.14% carbon, 0.3 to 1.1 silicon, 0.005 to 0.03% phosphorus, 0.002 to 0.035% sulfur, 0.06 to 0.2% zirconium, 1.6 to 3.0% manganese, 0.1 to 0.4% molyhden, traces up to 1.0% chromium and further 0.005 to 0.25% niobium, vanadium, cerium, lanthanum, boron and tellurium individually or in combination. The essence of the solution is that the steel is rolled into strips temperature from 780 to 880 QC and then to the running section is intensely cooling in the range of 10 to 55 ° C / sec. up to a winding temperature of 450 ° C to 560 ° C.
Description
Vynález sa týká sposobu valcovania za tepla pásoiv hrůbky 1,5 až 5 mm z konstrukčně]' nízkouhlíkovej ocele s vyššou medzou sklzu a. rieši problém zvýše,nia tvárníte! nosti plechov za studená pri zachovaní vysokých pevnostných vlastností, prostredníctvom dosiahnutia dvojfázovej feriticko-martenzitickej štruktúry bez žíhania.The invention relates to a method of hot-rolling a strip of 1.5 to 5 mm depth in structural low carbon steel with a higher yield point a. solves the problem of increasing, nia make! cold sheet metal while maintaining high strength properties, by achieving a two-phase ferritic-martensitic structure without annealing.
V súčasnosti je známe, že tepelným spracovaním nízkolegovuných ocelí možno dosiahnuť dvoufázové feriticko-martenzitické štruktúry. Vyžaduje si to však nákladné zariadenia na žíhanie a najma na ochladzovanie nadkritiíckými rýchlosťami zo žíhacej teploty. Známe sú aj ocele s vyššími pevnostnými vlastnosťami vyrábané válcováním za tepla, ako feriticko-perlitické alebo s acikulárnym feritom. V týchto prípadoch na úkor zvýšenia pevnostných vlastností sa znižujú tvárné vlastnosti. Tieto vlastnosti ocelí sa dosahujú normalizačným žíháním pri teplotách 880—-950 °C. Pri tomto, tepelnom spraoování však u nich dochádza k zníženiu pevnostných vlastností, čo znamená ich znehodnotenie, pretože výrobky z nich by si vyžiadali vačšiu hmotnost Používajú sa preto hlavně v stave po válcování alebo po, následnom zušlechťovaní. V případe zvyšovania pevnostných vlastností, aj v tomto, případe klesajú tvárné vlastnosti například pre lisovanie.It is now known that two-phase ferritic-martensitic structures can be achieved by heat treatment of low-alloy steels. However, this requires costly annealing devices and, in particular, cooling at supercritical speeds from the annealing temperature. Also known are steels with higher strength properties produced by hot rolling, such as ferritic-pearlitic or with acicular ferrite. In these cases, the ductile properties are reduced at the expense of increasing the strength properties. These steel properties are achieved by normalizing at 880-950 ° C. However, in this thermal treatment, they exhibit a reduction in strength properties, which means their deterioration, since the articles made of them would require a greater weight. In the case of increasing the strength properties, again in this case, the ductile properties, for example, for compression, decrease.
Uvedené nedostatky odstraňuje a problém rieši sposob valcovania za tepla pásov hrůbky 1,5 až 5 mm z konštrukčnej nízkouhlíkovej ocele o chemickom zložení v hmotnostnom obsahu 0,03 až 0,14 % uhlíka, 0,3 až 1,1 kremíka, 0,005 až 0,03 % fosforu, 0,002 až 0,035 % síry, 0,06 až 0,2 % zirkonu, 1,6 až 3,0 % mangánu, 0,1 až 0,4 pere. molybdenu, stupy až 1,0 % chrómu ,a ďalej 0,005 až 0,25 % niobu, vanádu, céru, lantánu, bóru a teiúru jednotlivo alebo ich vzájomnej kombinácii podlá vynálezu, ktorého podstata spočívá v tom, že takáto o,cel' sa válcuje na pásy pri dovalcovacej teplotě od 780 do 880 °C a potom sa na výbehovom úseku valcovacej tratě intenzívně ochladzuje rýchlosťou od 10 do, 55 °C/sek. až po navíjaciu teplotu od 450 °C do 560 °C.The above-mentioned deficiencies are eliminated and the problem is solved by the method of hot rolling of 1.5 to 5 mm thick strips of structural low carbon steel with chemical composition in the content of 0.03 to 0.14% carbon, 0.3 to 1.1 silicon, 0.005 to 0 03% phosphorus, 0.002 to 0.035% sulfur, 0.06 to 0.2% zirconium, 1.6 to 3.0% manganese, 0.1 to 0.4 washes. molybdenum, degrees of up to 1.0% chromium, and further 0.005 to 0.25% of niobium, vanadium, cerium, lanthanum, boron and theory individually or in combination with one another according to the invention, which consists in it is rolled into strips at a rolling temperature of from 780 to 880 ° C and then cooled down intensively at a speed of from 10 to 55 ° C / sec. up to a winding temperature of 450 ° C to 560 ° C.
Výhody riešenia sú v tom, že u tejto ocele s definovaným chemickým zložením sa zabezpečujú zvýšené pevnostně vlastnosti spolu s tvárnitelnosťou plechov za studená ekonomicky výhodným sposobom už pri válcování za tepla do uvedených hrúbok, pri ktorom sa dosahuje vhodná dvojfázová feriticko-martenzitická štruktúra, bez potřeby ďalšleho žíhania. Pri ochladzovaní podlá vynálezu, riadeného podlá hrůbky plechu, vzniká do 20 % mairtenzitu. Plechy vyvalcované týmto sposobom, majú široké uplatnenie v strojárenákoím a. najma v automobilovom priemysle na súčiastky vyhotovené lisováním za studená pri náročných podmienkach def ormácie.The advantages of the solution are that in this steel with a defined chemical composition, increased strength properties together with cold formability of the sheets are ensured in an economically advantageous way already during hot rolling to the mentioned thicknesses, which achieves a suitable two-phase ferritic-martensitic structure without further annealing. Upon cooling according to the invention, controlled according to the depth of the sheet, up to 20% of the melt density is produced. Sheets rolled in this way have a wide application in machine engineering. especially in the automotive industry for cold press components under demanding conditions.
Sposob valcovania podlá vynálezu je vysvětlený na nasledujúcom příklade:The rolling process according to the invention is explained in the following example:
Ocel' o chemickom zložení 0,08 % C, 0,76 pere. Si, 0,025 % P, 0,014 '% S, 0,11 % Zr, 2,02 % Mn, 0,28 % Mo, sa válcuje na širokopásovej trati z bramy ohriatej na teplotu 1 280 °C a celkovým úberoim z 200' na hrůbku 3 mm pri dovalcovacej teplote 830 stupňov Celsia. Na výbehovom úseku valcovacej tratě, za použitia laminačného ria,děného chladenia, sa pás intenzívně chladí rýchlosťou 24 °C/se. až po navíjaciu teplotu 490 °C.Steel with a chemical composition of 0.08% C, 0.76 pens. Si, 0.025% P, 0.014% S, 0.11% Zr, 2.02% Mn, 0.28% Mo, is rolled on a broadband mill from a slab heated to 1280 ° C and total removal from 200 'to 3 mm depth at a rolling temperature of 830 degrees Celsius. The strip is intensively cooled at a speed of 24 ° C / sec. up to a winding temperature of 490 ° C.
Vlastnosti pásu po vyvalcovaní podl'a uvedeného příkladu sú:The properties of the strip after rolling according to the example are:
medza sklzu 381 MPa, pevnosť 618 MPa, ťažnosť Ag 2,9,5 %.yield strength 381 MPa, strength 618 MPa, elongation Ag 2,9,5%.
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CS847408A CS246304B1 (en) | 1984-10-01 | 1984-10-01 | Hot rolling method of strips 1,5 till 5 mm thick from structural low-carbon steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CS847408A CS246304B1 (en) | 1984-10-01 | 1984-10-01 | Hot rolling method of strips 1,5 till 5 mm thick from structural low-carbon steel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CS740884A1 CS740884A1 (en) | 1985-08-15 |
| CS246304B1 true CS246304B1 (en) | 1986-10-16 |
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ID=5423144
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CS847408A CS246304B1 (en) | 1984-10-01 | 1984-10-01 | Hot rolling method of strips 1,5 till 5 mm thick from structural low-carbon steel |
Country Status (1)
| Country | Link |
|---|---|
| CS (1) | CS246304B1 (en) |
-
1984
- 1984-10-01 CS CS847408A patent/CS246304B1/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| CS740884A1 (en) | 1985-08-15 |
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