CS201564B1 - Method of thermal treatment of thick-walled steel tubes from low-carbon weldable steels - Google Patents
Method of thermal treatment of thick-walled steel tubes from low-carbon weldable steels Download PDFInfo
- Publication number
- CS201564B1 CS201564B1 CS392779A CS392779A CS201564B1 CS 201564 B1 CS201564 B1 CS 201564B1 CS 392779 A CS392779 A CS 392779A CS 392779 A CS392779 A CS 392779A CS 201564 B1 CS201564 B1 CS 201564B1
- Authority
- CS
- Czechoslovakia
- Prior art keywords
- thick
- low
- temperature
- tubes
- steel tubes
- Prior art date
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- 229910000831 Steel Inorganic materials 0.000 title claims description 11
- 239000010959 steel Substances 0.000 title claims description 11
- 229910052799 carbon Inorganic materials 0.000 title claims description 8
- 238000000034 method Methods 0.000 title claims description 5
- 238000007669 thermal treatment Methods 0.000 title 1
- 238000010438 heat treatment Methods 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- 238000001816 cooling Methods 0.000 claims description 3
- 239000007921 spray Substances 0.000 claims description 3
- 238000005496 tempering Methods 0.000 claims description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical group [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 3
- 229910052748 manganese Inorganic materials 0.000 description 3
- 239000011572 manganese Substances 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 229910052710 silicon Inorganic materials 0.000 description 3
- 239000010703 silicon Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 2
- 238000010606 normalization Methods 0.000 description 2
- 229910052698 phosphorus Inorganic materials 0.000 description 2
- 239000011574 phosphorus Substances 0.000 description 2
- 229910052717 sulfur Inorganic materials 0.000 description 2
- 239000011593 sulfur Substances 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 1
- 238000000137 annealing Methods 0.000 description 1
- 230000002180 anti-stress Effects 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
Landscapes
- Heat Treatment Of Articles (AREA)
Description
Vynález se týká způsobu tepelného zpracování sílnostěnných ocelových trubek z nízkouhlíkatých svařitelných ocelí, například z oceli o chemickém složení uhlík od 0,15 do 0,22 % hmot., mangan od 0,5 do 0,8 % hmot., křemík od 0,17 do 0,37 % hmot., chrom, nikl a měď maximálně po 0,25 % hmot. a fosfor a síra maximálně do 0,040 °/o hmot., nebo o chemickém složení uhlík maximálně 0,20 % hmot., mangan maximálněThe invention relates to a process for the heat treatment of thick-walled steel tubes of low-carbon weldable steels, for example steel having a chemical composition of carbon from 0.15 to 0.22% by weight, manganese from 0.5 to 0.8% by weight, silicon from 0, 17 to 0.37 wt.%, Chromium, nickel and copper of 0.25 wt. and phosphorus and sulfur up to a maximum of 0.040% / mass, or with a chemical composition of carbon a maximum of 0.20% mass, manganese a maximum
1,5 % hmot., křemík 0,55 % hmot., fosfor maximálně 0,05 % hmot. a síra 0,045 % hmot.1.5 wt.%, Silicon 0.55 wt.%, Phosphorus maximum 0.05 wt. and sulfur 0.045 wt.
Při výrobě sílnostěnných trubek z nízko, uhlíkatých, svařitelných ocelí o síle stěny 12 mm a více dochází k tomu, že výsledné mechanické hodnoty vyválcované trubky jsou podkročeny. Požadovaných mechanických hodnot se nedosáhne ani po normalizačním žíhání vyválcovaných trubek, spíše naopak, dochází ještě k poklesu meze kluzu i meze pevnosti, a to vlivem zhrubnutí zrna, což je dáno setrváním žíhaných trubek na normalizační teplotě,In the production of thick-walled tubes of low-carbon, weldable steels with a wall thickness of 12 mm or more, the resulting mechanical values of the rolled tube are undershot. The required mechanical values are not achieved even after normalization annealing of rolled tubes, rather on the contrary, there is still a decrease in yield strength and strength due to grain coarsening, which is given by the retention of annealed tubes at normalization temperature,
Uvedené nevýhody stávajícího stavu techniky se odstraní způsobem tepelného zpracování sílnostěnných ocelových trubek z nízkouhlíkatých svařitelných ocelí podle vynálezu, jehož podstata spočívá v tom, že vyválcovné trubky se ohřejí na teplotu 820 ažThese disadvantages of the prior art are eliminated by the heat treatment method of thick-walled weldable low-carbon steel tubes according to the invention, which consists in the fact that the rolling tubes are heated to a temperature of 820 to 80 ° C.
860 °C při setrvání na této teplotě 5 až 10 minut, načež se podrobí ochlazení vodní sprchou na teplotu 80 až 40 °C a v další fázi popouštěné na teplotě 620 až 680 °C po dobu 10 až 60 minut od nasazení do· pece v závislosti na tloušťce trubky.860 ° C for 5 to 10 minutes at this temperature, then subjected to a water spray cooling to 80 to 40 ° C and subsequently tempered to 620 to 680 ° C for 10 to 60 minutes after the furnace depending on the thickness of the pipe.
Výhodou způsobu tepelného zpracování sílnostěnných ocelových trubek z nízkOuhlíkatýčh svařitelných ocelí, podle vynálezu je to, že se jim dosáhne rovnoměrné beinitické struktury po celém průřezu trubek, takže tepelně zpracovaná trubka vykazuje zvýšené mechanické a plastické vlastnosti i zvýšené vlastnosti proti dynamickému namáhání.The advantage of the method of heat treatment of thick-walled steel tubes of low carbon weldable steels according to the invention is that they achieve a uniform beinitic structure over the entire cross-section of the tubes, so that the heat treated tube exhibits enhanced mechanical and plastic properties and enhanced anti-stress properties.
Vyválcované trubky o· rozměru průměru 168 mm o tloušťce stěny 17,5 mm z oceli o chemickém složení uhlík 0,18 % hmot., mangan 1,24 % hmot., křemík 0,46 % hmot., zbytek železo a běžné nečistoty vykazovaly mechanické parametry, a to mez kluzu 334, až 343 MPa, což je pod spodní hranici stanovené meze kluzu, která má být minimálně 353 MPa, dále mez pevnosti 510 až 628 MPa a tažnost minimálně 20 %.Rolled tubes with a diameter of 168 mm and a wall thickness of 17.5 mm made of steel with a chemical composition of 0.18 wt% carbon, manganese 1.24 wt%, silicon 0.46 wt%, the remainder iron and common impurities showed mechanical parameters, namely yield strength 334, up to 343 MPa, which is below the lower limit of the determined yield strength, which should be at least 353 MPa, further strength limit 510 to 628 MPa and elongation at least 20%.
Trubky se ohřály na teplotu 840 °C za 15 minut od nasazení do pece, na které setrvaly po dobu 10 min. Ochladnutí ohřátých trubek se provedlo vodní sprchou na teplotu 40 °G měřenou ve vzdálenosti 2 m od místa prvního styku chladicí vody s trubkami. Rychlost trubek pod vodní sprchou byla 1,6 m/min. Ochlazení trubky se v další fázi ohřály na popouštěcí teplotu 650 °C po dobu 30 min. od nasazení do pece.The tubes were heated to 840 ° C for 15 minutes after being placed in the oven for 10 minutes. The heated tubes were cooled with a water spray at a temperature of 40 ° C measured at a distance of 2 m from the first contact point of the cooling water with the tubes. The speed of the pipes under the water shower was 1.6 m / min. Cooling of the tube was then heated to a tempering temperature of 650 ° C for 30 min. from deployment to the furnace.
Takto tepelně zpracované trubky vykazo-Such heat-treated tubes have
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CS392779A CS201564B1 (en) | 1979-06-07 | 1979-06-07 | Method of thermal treatment of thick-walled steel tubes from low-carbon weldable steels |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CS392779A CS201564B1 (en) | 1979-06-07 | 1979-06-07 | Method of thermal treatment of thick-walled steel tubes from low-carbon weldable steels |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CS201564B1 true CS201564B1 (en) | 1980-11-28 |
Family
ID=5380746
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CS392779A CS201564B1 (en) | 1979-06-07 | 1979-06-07 | Method of thermal treatment of thick-walled steel tubes from low-carbon weldable steels |
Country Status (1)
| Country | Link |
|---|---|
| CS (1) | CS201564B1 (en) |
-
1979
- 1979-06-07 CS CS392779A patent/CS201564B1/en unknown
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