CN102337457A - High tensile steel plate containing rare earth La and rolling method thereof - Google Patents
High tensile steel plate containing rare earth La and rolling method thereof Download PDFInfo
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- CN102337457A CN102337457A CN2011102912253A CN201110291225A CN102337457A CN 102337457 A CN102337457 A CN 102337457A CN 2011102912253 A CN2011102912253 A CN 2011102912253A CN 201110291225 A CN201110291225 A CN 201110291225A CN 102337457 A CN102337457 A CN 102337457A
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Abstract
The invention discloses a high tensile steel plate containing rare earth La and a rolling method thereof, belonging to the technical field of metallurgy and relating to a forming technique. The high tensile steel plate is characterized in that a plate blank of the high tensile steel plate comprises the following chemical compositions (in percentage by weight): 0.14-0.30% of C, 1.5-2.0% of Mn, 0.6-1.0% of Si, not more than 0.015% of P, not more than 0.020% of S, 0.01-0.06% of Ti, 0.0005-0.0040% of B, 0.001-0.1% of La and the balance of Fe and unavoidable impurities. The rolling method is as follows: the heating temperature is 1200-1250 DEG C; the temperature keeping time is 3-5 hours; the rough rolling opening temperature is 1000-1100 DEG C; the finish rolling opening temperature is 920-960 DEG C; the finished rolling temperature is 850-900 DEG C; and the two-section rolling total reduction is not less than 75%. The finished steel plates obtained according to the invention have the characteristics of thickness of 5-25 mm, excellent mechanical property, tensile strength of 800-900 MPa, yield strength of 400-500 MPa and elongation of 18-25%.
Description
Technical field
The invention discloses a kind of rare earth La high tensile steel plate and rolling method thereof of containing, belong to rare earth steel novel material manufacture field, relate to rare earth steel microalloying and hot-rolled steel plate technology.
Background technology
As everyone knows, the solid solution Rare Earth Lanthanum of earth La in low-carbon alloy steel can crystal grain thinning.Under same cooling rate, reduce content of pearlite in alloy, increase ferrite content.The solid solution rare earth La has the austenite of slowing down to decompose to steel, suppresses the effect that the upper bainite tissue produces.Solid solution La produces significantly influence to γ → α phase transformation, and the refinement ferrite crystal grain has improved hardness.In addition, the effective inclusion in the modified steel of high lanthanum rare earth addition in the steel reduces the quantity of inclusion, improves the mechanical property of steel.Like high lanthanum rare earth addition La/S (mass ratio) in the 16Mn steel is 2.5 o'clock, and comprehensive mechanical property reaches optimum value.
The microalloying mechanism of action of rare earth in steel is that solid solution and solid state reaction thereof through element influence microstructure, thereby makes metal obtain good performance.Along with the cleanliness factor of steel improves constantly, the microalloy highly malleablized effect of REE becomes increasingly conspicuous.The highly malleablized degree of microalloying depends on the interaction of solution strengthening, REE and other solute elements of trace rare-earth element, the existence of rare earth (atom, inclusion or compound), size, shape, distribution; Particularly in the gathering partially of crystal boundary, and rare earth is to steel surface and matrix effect on structure etc.The present invention changes the tissue of hot rolling attitude high tensile steel plate through adding earth La, makes and changes a small amount of perlite+bainite structure into by perlite+ferritic mixed structure, and mechanical property significantly improves.
Summary of the invention
The objective of the invention is to disclose a kind of La of containing high tensile steel plate and rolling method thereof, (weight percent) chemical composition content of its slab should meet: C 0.14%-0.30%, Mn 1.5%-2.0%; Si 0.6%-1.0%, P≤0.015%, S≤0.002%; Ti 0.01%-0.06%; B 0.0005%-0.0040%, La 0.001%-0.1%, surplus is Fe and unavoidable impurities.
The Heating temperature 1200-1250 of slab ℃, soaking time 1-6 hour, 1000-1100 ℃ of roughing temperature, final rolling temperature 920-960 ℃, finishing temperature 850-900 ℃, two sections rolling total reduction >=75%.
Production board thickness is 5-25mm.The product of explained hereafter has excellent mechanical property thus, and tensile strength reaches 800-900MPa, ys 400-500MPa, unit elongation 18-25%.
The outstanding advantage of the present invention is that hot-rolled steel sheet not only has high-strength high-plasticity, but also can substitute and reduce the add-on of alloying element through rare earth, practices thrift cost.Realize environmentally friendly, the resource-conserving production development pattern of field of materials.
Description of drawings
Fig. 1 is the typical gold phase constitution photo of embodiment 1 correspondence.
Embodiment
Below in conjunction with embodiment the present invention is done further detailed explanation.
Embodiment 1
Put into process furnace with intending rolling slab, (weight percent) chemical ingredients of slab is: C 0.24%, and Mn 1.72%, and Si 0.73%; P 0.0115%, and S 0.002%, and Ti 0.03%; B 0.0007%, and La 0.09%, and surplus is Fe and unavoidable impurities.
Slab thickness is 95mm, 1220 ℃ of Heating temperatures, soaking time 1.5 hours.The slab that heats is sent into roughing mill be rolled, 1020 ℃ of roughing temperature.The roughing reduction in pass is 40%.Then, the slab after the roughing is sent into the finishing mill station be rolled, 950 ℃ of final rolling temperatures, 890 ℃ of finishing temperatures, the reduction in pass of finish rolling is 15%.Two sections rolling total reductions are 91.5%.The thickness of steel plate is 8mm after the finish rolling, and its mechanical property detected value is seen table 1.
Table 1 mechanical property detected value
| Project | R m(MPa) | R p0.2(MPa) | A(％) | R 0.2/R m | R m·A(MPa·％) |
| Embodiment 1 | 850 | 480 | 18.5 | 0.56 | 15725 |
The metallographic structure of hot-rolled steel sheet is as shown in Figure 1.
Claims (3)
1. one kind contains the rare earth La high tensile steel plate, it is characterized in that chemical ingredients by weight percentage: C0.14%-0.30%, Mn 1.5%-2.0%; Si 0.6%-1.0%, P≤0.015%, S≤0.002%; Ti0.01%-0.06%; B 0.0005%-0.0040%, La 0.001%-0.1%, surplus is Fe and unavoidable impurities.
2. rolling method that contains the rare earth La high tensile steel plate of characteristic according to claim 1; It is characterized in that rolling technology is: Heating temperature 1200-1250; Soaking time 1-6 hour, 1000-1100 ℃ of roughing temperature, final rolling temperature 920-960 ℃; Finishing temperature 850-900 ℃, two sections rolling total reduction >=75%.
3. a kind of rare earth La high tensile steel plate that contains as claimed in claim 1 is characterized in that its mechanical property detected value is: tensile strength 800-900MPa, ys 400-500MPa, unit elongation 18-25%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011102912253A CN102337457A (en) | 2011-09-30 | 2011-09-30 | High tensile steel plate containing rare earth La and rolling method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011102912253A CN102337457A (en) | 2011-09-30 | 2011-09-30 | High tensile steel plate containing rare earth La and rolling method thereof |
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| CN102337457A true CN102337457A (en) | 2012-02-01 |
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| CN2011102912253A Pending CN102337457A (en) | 2011-09-30 | 2011-09-30 | High tensile steel plate containing rare earth La and rolling method thereof |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1600889A (en) * | 2004-10-26 | 2005-03-30 | 宁波浙东精密铸造有限公司 | Wearable cast steel in microalloy martensite and manufacturing method |
| CN101497969A (en) * | 2009-03-13 | 2009-08-05 | 武汉钢铁(集团)公司 | High-performance weather-resisting anti-seismic steel for building and production method thereof |
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- 2011-09-30 CN CN2011102912253A patent/CN102337457A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1600889A (en) * | 2004-10-26 | 2005-03-30 | 宁波浙东精密铸造有限公司 | Wearable cast steel in microalloy martensite and manufacturing method |
| CN101497969A (en) * | 2009-03-13 | 2009-08-05 | 武汉钢铁(集团)公司 | High-performance weather-resisting anti-seismic steel for building and production method thereof |
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Application publication date: 20120201 |