CN1302140C - Micro-alloyed high-carbon steel and application thereof - Google Patents
Micro-alloyed high-carbon steel and application thereof Download PDFInfo
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- CN1302140C CN1302140C CNB2003101059131A CN200310105913A CN1302140C CN 1302140 C CN1302140 C CN 1302140C CN B2003101059131 A CNB2003101059131 A CN B2003101059131A CN 200310105913 A CN200310105913 A CN 200310105913A CN 1302140 C CN1302140 C CN 1302140C
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Abstract
The present invention relates to micro-alloyed high carbon steel and the application thereof. By adding niobium to steel and adopting corresponding specific composition design, in the present invention, the niobium micro-alloyed high carbon steel used for producing high strength steel cables or steel strands is prepared. The alloyed high carbon steel of the present invention is composed of carbon, silicon, manganese, niobium, phosphorus, sulfur, aluminium, Fe, etc. By adding micro niobium into the high carbon steel, the present invention can enhance beginning temperature of the conversion from A (austenite) to P (pearlite) and enlarge region; front austenite crystals of a phase change foothold are small, the grain boundary area is enlarged, nucleation points are increased, and the sorbitizing rate is higher. Simultaneously, the addition of the niobium decelerates the diffusion of iron and carbon atoms, reduces the interlamellar spacing and sizes of the pearlites, and is good for the assurance of the toughness and the plasticity of finished products of the refined high carbon steel.
Description
Technical field
The present invention relates to a kind of new steel products and application thereof, especially a kind of Nb-microalloying high carbon steel and application thereof.
Background technology
The microalloying of high-carbon rigid line is meant and adds a small amount of alloying element such as chromium, vanadium etc. that in steel to improve its stabilization of austenite degree, the hardening capacity when improving the wire rod cooling is guaranteed sufficient sorbitizing, and the homogeneous microstructure of wire rod, intensity are increased.
At present both at home and abroad the deficiency for the micro-alloying technology of high-carbon rigid line is: the microalloying of high-carbon rigid line is mainly used in the production of steel strand with big specification high-carbon rigid line (as grade of steel 82B); When adopt adding microalloy element chromium, vanadium or rare earth, exist in the production that molten steel connects watering property poor (when adding trace chromium or rare earth) and the wayward shortcomings such as (when adding trace vanadium) of composition fluctuation.
Small dimension high-carbon rigid line (as grade of steel 72A, 70#) for purposes such as high strength wire rope or steel strand manufacturings, do not see at present the report that adopts microalloying to handle in the production, for improving the intensity and the over-all properties of this type of high-carbon rigid line and merchant wire thereof, the invention provides a kind of microalloying treatment technology that is used for small dimension high-carbon rigid line, after adopting the Nb-microalloying technology its intensity and over-all properties are improved greatly, satisfied the demand of making important use high strength wire rope or steel strand.
Summary of the invention
The objective of the invention is for a kind of microalloying high carbon steel is provided, add the trace niobium element in this high carbon steel, can make its A → P (austenite → perlite) change the beginning temperature improves, intervally enlarges, can effectively suppress growing up of austenite crystal in the heat-processed, grain boundary area increases, the forming core point increases, and sorbitic rate is higher; Simultaneously, the adding of niobium has slowed down the diffusion of iron, carbon atom, and pearlitic sheet interlayer spacing reduced, and size reduces, and helps guaranteeing the toughness and the plasticity of the high carbon steel finished product refined.
Another object of the present invention is for a kind of application of microalloying high carbon steel is provided.
Purpose of the present invention can realize by following measure:
A kind of microalloying high carbon steel is made of the element of following weight percent:
Carbon 0.60%-0.78% silicon 0.15%-0.55%
Manganese 0.30%-0.90% niobium 0.01-0.1%
Phosphorus 0-0.045% sulphur 0-0.045%
Aluminium 0.011-0.020%, its surplus is iron and other unavoidable impurities.
Preparation technology's flow process of above-mentioned high carbon steel is: converter (electric furnace) → ladle refining furnace → billet continuous casting → process furnace → controlled rolling and controlled cooling obtains the high carbon steel Wire Rod.
Another object of the present invention can realize by following measure:
A kind of application of microalloying high carbon steel is to use it for the Nb-microalloying high carbon steel Wire Rod of making important use high strength wire rope or steel strand.
The present invention has following advantage compared to existing technology:
The present invention adds the trace alloying element niobium in the high carbon steel raw material, improves thereby can make A → P (austenite → perlite) change the beginning temperature, and interval expansion, austenite crystal is tiny before the phase transformation, and grain boundary area increases, and the forming core point increases, and sorbitic rate is higher; Simultaneously, the adding of niobium has slowed down the diffusion of iron, carbon atom, and pearlitic sheet interlayer spacing is reduced, and size reduces, help guaranteeing the toughness and the plasticity of finished product.The cooling control after rolling cooling rate guarantees between 10 ℃-30 ℃ in addition, effectively suppressed separating out of proeutectoid ferrite, refinement pearlitic grain, reduced pearlite interlaminar spacing, improved sorbitic rate, made the end properties of final wire rod satisfy the requirement of making wireline or steel strand usefulness steel.
Concrete embodiment
The present invention also will be described in further detail in conjunction with the embodiments:
Embodiment 1:
Heat (batch) number is 33/4531: 55 tons of molten iron and steel scrap add converter for 5 tons, smelted in 31 minutes through converter, terminal point composition (weight percentage) is: carbon (0.62%), manganese (0.46%), phosphorus (0.012%), sulphur (0.013%), 1605 ℃ of tapping temperatures, 55 tons of taps, during tapping be: ferrosilicon 130Kg with addition of alloy, silicomanganese 100Kg, aluminium ferromanganese 50Kg, ferro-niobium 40Kg obtains the ultimate constituent in the steel (weight percentage) and is: carbon (0.71%), silicon (0.24%), manganese (0.64%), phosphorus (0.019%), sulphur (0.012%), niobium (0.029%), aluminium (0.011%); Molten steel winches to ladle refining furnace (LF) through refining in 31 minutes, adds refining slag 600Kg, submerged arc slag 100Kg, goes out 1545 ℃ of LF furnace temperatures; Molten steel beam protection cast, 1494-1501 ℃ of middle bag temperature, pulling rate 1.7-1.8m/min, pulling out specification is 150 * 150mm
2Continuous casting square billet; Slab heating temperature 1140-1160 ℃, through 6 roughing units, 8 middle milling train groups, 4 pre-finishing mill groups, 8 finishing mills, the roll forming of 4 size-reducing mill groups, 908 ℃ of laying temperatures, finished product are φ 6.5mm microalloy high-carbon Wire Rod.
Embodiment 2:
Heat (batch) number is 33/4536: 53 tons of molten iron and steel scrap add converter for 5 tons, smelted in 30 minutes through converter, terminal point composition (weight percentage) is: carbon (0.61%), manganese (0.52%), phosphorus (0.011%), sulphur (0.011%), 1585 ℃ of tapping temperatures, 55 tons of taps, during tapping be: ferrosilicon 150Kg with addition of alloy, silicomanganese 100Kg, aluminium ferromanganese 50Kg, ferro-niobium 40Kg obtains the ultimate constituent in the steel (weight percentage) and is: carbon (0.72%), silicon (0.26%), manganese (0.60%), phosphorus (0.011%), sulphur (0.010%), niobium (0.031%), aluminium (0.014%); Molten steel winches to ladle refining furnace (LF) through refining in 30 minutes, adds refining slag 600Kg, submerged arc slag 100Kg, goes out 1555 ℃ of LF furnace temperatures; Molten steel beam protection cast, 1501-1509 ℃ of middle bag temperature, pulling rate 1.7-1.8m/min, pulling out specification is 150 * 150mm
2Continuous casting square billet; Slab heating temperature 1140-1150 ℃, through 6 roughing units, 8 middle milling train groups, 4 pre-finishing mill groups, 8 finishing mills, the roll forming of 4 size-reducing mill groups, 910 ℃ of laying temperatures, finished product are φ 6.5mm microalloy high-carbon Wire Rod.
Embodiment 3:
Heat (batch) number is 33/4546: 54 tons of molten iron and steel scrap add converter for 4 tons, smelted in 29 minutes through converter, terminal point composition (weight percentage) is: carbon (0.60%), manganese (0.43%), phosphorus (0.012%), sulphur (0.013%), 1602 ℃ of tapping temperatures, 55 tons of taps, during tapping be: ferrosilicon 140Kg with addition of alloy, silicomanganese 40Kg, aluminium ferromanganese 50Kg, ferro-niobium 40Kg obtains the ultimate constituent in the steel (weight percentage) and is: carbon (0.71%), silicon (0.29%), manganese (0.61%), phosphorus (0.010%), sulphur (0.010%), niobium (0.030%), aluminium (0.013%); Molten steel winches to ladle refining furnace (LF) through refining in 30 minutes, adds refining slag 600Kg, submerged arc slag 100Kg, goes out 1565 ℃ of LF furnace temperatures; Molten steel beam protection cast, 1508-1515 ℃ of middle bag temperature, pulling rate 1.6-1.7m/min, pulling out specification is 150 * 150mm
2Continuous casting square billet; Slab heating temperature 1148-1160 ℃, through 6 roughing units, 8 middle milling train groups, 4 pre-finishing mill groups, 8 finishing mills, the roll forming of 4 size-reducing mill groups, 904 ℃ of laying temperatures, finished product are φ 6.5mm microalloy high-carbon Wire Rod.
Embodiment 4:
Heat (batch) number is 22/12771: 54 tons of molten iron and steel scrap add converter for 4 tons, smelted in 31 minutes through converter, terminal point composition (weight percentage) is: carbon (0.48%), manganese (0.33%), phosphorus (0.014%), sulphur (0.017%), 1613 ℃ of tapping temperatures, 55 tons of taps, during tapping be: ferrosilicon 140Kg with addition of alloy, silicomanganese 100Kg, aluminium ferromanganese 50Kg, ferro-niobium 40Kg obtains the ultimate constituent in the steel (weight percentage) and is: carbon (0.69%), silicon (0.27%), manganese (0.60%), phosphorus (0.014%), sulphur (0.013%), niobium (0.032%), aluminium (0.015%); Molten steel winches to ladle refining furnace (LF) through refining in 31 minutes, adds refining slag 600Kg, submerged arc slag 100Kg, goes out 1565 ℃ of LF furnace temperatures; Molten steel beam protection cast, 1520-1526 ℃ of middle bag temperature, pulling rate 1.6-1.7m/min, pulling out specification is 150 * 150mm
2Continuous casting square billet; Slab heating temperature 1140-1150 ℃, through 6 roughing units, 8 middle milling train groups, 4 pre-finishing mill groups, 8 finishing mills, the roll forming of 4 size-reducing mill groups, 897 ℃ of laying temperatures, finished product are φ 5.5mm microalloy high-carbon Wire Rod.
Embodiment 5:
Heat (batch) number is 33/4599: 55 tons of molten iron and steel scrap add converter for 4 tons, smelted in 30 minutes through converter, terminal point composition (weight percentage) is: carbon (0.69%), manganese (0.43%), phosphorus (0.011%), sulphur (0.010%), 1580 ℃ of tapping temperatures, 55 tons of taps, during tapping with addition of alloy be: ferrosilicon 150Kg, aluminium ferromanganese 50Kg, ferro-niobium 40Kg obtain the ultimate constituent in the steel (weight percentage) and are: carbon (0.73%), silicon (0.23%), manganese (0.61%), phosphorus (0.009%), sulphur (0.010%), niobium (0.031%), aluminium (0.012%); Molten steel winches to ladle refining furnace (LF) through refining in 35 minutes, adds refining slag 600Kg, submerged arc slag 100Kg, goes out 1557 ℃ of LF furnace temperatures; Molten steel beam protection cast, 1506-1511 ℃ of middle bag temperature, pulling rate 1.7-1.8m/min, pulling out specification is 150 * 150mm
2Continuous casting square billet; Slab heating temperature 1142-1156 ℃, through 6 roughing units, 8 middle milling train groups, 4 pre-finishing mill groups, 8 finishing mills, the roll forming of 4 size-reducing mill groups, 912 ℃ of laying temperatures, finished product are φ 6.5mm microalloy high-carbon Wire Rod.
Above-mentioned technical process has been implemented in the preparation of Nb-microalloying high carbon steel Wire Rod of the present invention, by converter (electric furnace) smelting procedure, ladle refining furnace operation, billet continuous casting operation, process furnace operation, rolling process, the chemical ingredients of control steel is the content of niobium in the steel (during tapping with addition of an amount of ferrocolumbium) particularly; The cleanliness factor of control molten steel; The metallographic structure of control wire rod.The classic user of Nb-microalloying high carbon steel Wire Rod who prepares (Ningxia constant force wireline share company limited) uses, satisfied it and made of the requirement of high strength important use wireline, also can satisfy the requirement of its manufacturing galvanized wire rope and steel strand simultaneously with steel with steel.
Claims (2)
1, a kind of microalloying high carbon steel is characterized in that this high carbon steel is made of the element of following weight percent:
Carbon 0.60%-0.78% silicon 0.15%-0.55%
Manganese 0.30%-0.90% niobium 0.01-0.1%
Phosphorus 0-0.045% sulphur 0-0.045%
Aluminium 0.011-0.020%, its surplus is an iron.
2, the application of the described microalloying high carbon steel of a kind of claim 1 is characterized in that using it for and makes the high carbon steel Wire Rod.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2003101059131A CN1302140C (en) | 2003-10-21 | 2003-10-21 | Micro-alloyed high-carbon steel and application thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2003101059131A CN1302140C (en) | 2003-10-21 | 2003-10-21 | Micro-alloyed high-carbon steel and application thereof |
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| CN1609253A CN1609253A (en) | 2005-04-27 |
| CN1302140C true CN1302140C (en) | 2007-02-28 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN100469918C (en) * | 2007-05-28 | 2009-03-18 | 无锡市恒特力金属制品有限公司 | Nb microalloying high strength power metallurgy material and forming method thereof |
| CN104294167A (en) * | 2014-09-30 | 2015-01-21 | 合肥恒泰钢结构有限公司 | High-carbon hot-rolled steel |
| CN107419174B (en) * | 2017-07-31 | 2019-06-18 | 武汉钢铁有限公司 | Economical high-carbon steel and its manufacturing method |
| CN107653415A (en) * | 2017-08-17 | 2018-02-02 | 金轮针布(江苏)有限公司 | A kind of microalloy high-carbon steel for pin cloth product |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1035682A (en) * | 1988-03-08 | 1989-09-20 | 鞍山钢铁公司 | Niobium-containing high strength fishing |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1035682A (en) * | 1988-03-08 | 1989-09-20 | 鞍山钢铁公司 | Niobium-containing high strength fishing |
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