CN104789856A - Low-cost SM490C hot-rolling H section steel and preparation method thereof - Google Patents
Low-cost SM490C hot-rolling H section steel and preparation method thereof Download PDFInfo
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Abstract
The invention discloses SM490C hot-rolling H section steel and a preparation method thereof. The preparation method comprises a smelting technology and a rolling technology; the H section steel comprises the following chemical components in percentage by weight: 0.14-0.18% of C, 0.25-0.40% of Si, 1.35-1.50% of Mn, no more than 0.03% of P, no more than 0.020% of S, 0.001-0.002% of B, and the balance of Fe; the tensile strength of the H section steel is 490-610 MPa; the yield strength of the H section steel is higher than or equal to 325 MPa; the elongation percentage of the H section steel is higher than or equal to 30%;the impact at 20 DEG C of a hot-rolling H section steel finished wing plate is higher than or equal to 100 J; the low-temperature impact at 0 DEG C of the wing plate is higher than or equal to 80 J.
Description
Technical field
The present invention relates to metallurgical technology, particularly relate to one and adopt Hot Metal in Beam Blank production low cost S M490C hot rolled H-shaped and preparation method thereof.
Background technology
In Japanese Industrial Standards JIS G 3106, trade mark SM490C yield strength is greater than 325Mpa, and tensile strength scope is 490 ~ 610MPa, 0 DEG C of low-temperature impact >=47J.The domestic production for realizing this steel grade adopts the mode of microalloying (Nb, V, Ti) to obtain low temperature impact properties more.In SM490C and GB GB1591-2008 low-alloy high-tensile structural steel Q345C performance close to but also there is difference, SM490C yield strength is lower than Q345C yield strength 20MPa, the tensile strength scope of Q345C is 470MPa ~ 630MPa, Q345C low-temperature impact 0 DEG C >=34.J can find out the tensile strength narrow range 40MPa of day mark SM490C than national standard Q345C from the difference of performance, and illustrate that day marks and propose strong flexor ratio requirement to this kind, i.e. the requirement of anti-seismic performance, SM490A requires to exceed 7J to 0 DEG C of low-temperature impact simultaneously.
For the present situation of domestic steel market doldrums, while ensureing that quality product meets product performance, the production cost reducing steel is the target that steel mill is pursued.Chinese invention patent CNIO3820706A discloses excellent hot rolled H-shaped and preparation method thereof of a kind of boracic vanadium low-temperature impact toughness, and this patent reaches low temperature impact properties by adding alloy V and B.Chinese invention patent CNIO3556055A reaches the requirement of low temperature impact properties by adding Nb, Ti alloying.For ferro-niobium, vanadium iron and ferro-titanium price Market Situation costly, the present invention only adds ferro-boron (cost of alloy only increases 1-2 unit) that in alloying element, cost is minimum to reach the requirement of low temperature impact properties.
Summary of the invention
The present invention relates to a kind of low cost S M490C hot rolled H-shaped and preparation method thereof, comprise smelting technology and rolling technology, product appropriate design composition of the present invention, except interpolation silicon, only add boron alloy except manganese, and make its mechanical property reach low-temperature impact requirement by optimized production process method, can produce with the easiest, efficient method and manufacture again, reduce production cost.
For reaching above-mentioned purpose, a kind of low cost S M490C of the present invention is hot rolled H-shaped, the chemical composition of described H profile steel and weight percent content thereof are: C 0.14 ~ 0.18%, Si 0.25 ~ 0.40%, Mn 1.35 ~ 1.50%, P≤0.03%, S≤0.020%, B0.001 ~ 0.002%, all the other are Fe.
The tensile strength of wherein said H profile steel is 490MPa ~ 610MPa, yield strength >=325MPa, unit elongation >=30%, hot rolled H-shaped finished product wing plate 20 DEG C of impact >=100J, 0 DEG C of low-temperature impact >=80J.
Prepare the method that described low cost S M490C is hot rolled H-shaped, comprise the following steps: converter, LF refining, continuous beam blank casting, casting billet surface cleaning, Rolling With Universal Mill H profile steel, aligning.
Wherein the parameter of each step is: weight percent >=0.06% of converter terminal control C during smelting, weight percent≤0.025% of P, controls tapping temperature and is greater than 1640 DEG C; Alloying adopts silicomanganese and manganeseirom, and end-deoxidizer adopts aluminium calcium barium and aluminium ferromanganese; Refining white slag operates; Continuous casting liquidus temperature: TL=1512 DEG C; Molten steel overheat Δ T≤30 DEG C; Permanent pulling rate is adopted to operate; Rolling start rolling temperature 1150 ± 50 DEG C, after BD cogging, CCS universal mill is rolled, temperature 880 DEG C ~ 930 DEG C before CCS finishing rolling mill.
Wherein after refining, molten steel composition target value is weight percentage: C 0.16%, Si 0.30%, Mn 1.40%, P≤0.025%, S≤0.015%, B0.0012%, and all the other are Fe.
The invention difference from existing technology is that the present invention achieves following technique effect:
1. the present invention is by adopting boron micro-alloyed Composition Design, thiophos content and gas content strictly do not control simultaneously, and do not add the over-all properties that other alloying elements reach H profile steel, considerably reduce smelting cost, production technique is simple, is beneficial to popularization;
2. the present invention does not carry out control Alt content to reach the matched well of intensity and impelling strength;
3. the present invention can realize the operation of rolling and do not carry out controlled cooling model, and carry out delivery with As rolled and use, steel have good welding property.
Below in conjunction with accompanying drawing, the invention will be further described.
Accompanying drawing explanation
Fig. 1 is the hot rolled H-shaped preparation method's schema of low cost S M490C of the present invention.
Embodiment
Below in conjunction with embodiment, to above-mentioned being described in more detail with other technical characteristic and advantage of the present invention.
Embodiment 1:
The chemical component weight per-cent of steel is: C 0.17%, Si 0.38%, Mn 1.48%, P0.020%, S0.015%, B0.0012% all the other be Fe; Production method comprises 150t converter, external refining, continuous casting, heating, BD cogging, universal rolling successively.The parameter of each step is: adopt 150t converter smelting, it is 1650 DEG C that converter terminal C 0.17%, P 0.028%, S 0.025% controls converter terminal tapping temperature; Slag charge is joined and alloy addition comprises: lime 350 kilograms, silicomanganese 150 kilograms, vanadium nitrogen iron 11 kilograms, 49 kilograms, aluminium ferromanganese during external refining.LF temperature in place 1522 DEG C, LF offs normal temperature 1586 DEG C, heat-up time 25min, LF refining time 40 minutes; Wherein LF molten steel composition weight percent in place is C0.15%, Si0.03%, Mn1.30%, P0.021%, S0.017%, B0.011%; LF molten steel composition weight percent of offing normal is C 0.16%, Si 0.35%, Mn 1.45%, P0.020%, S0.015%, B0.0012%; Soft blow time 16min ensures that inclusion fully floats; Teeming temperature 1569 DEG C during continuous casting, continuous casting superheating temperature 33 DEG C, average pull rate is 0.95m/min; Steelworks ensures that steel billet is sent to Steel Mill without after surface quality and internal soundness; The strand that shaped blank is of a size of 555mm × 440mm by Steel Mill again carries out visual inspection before entering process furnace, have scab, crackle, the steel billet that sticks up skin choose; Furnace temp is 1268 DEG C; 2.3 hours heat-up times, be weak reducing atmosphere in soaking 40min process furnace, steel billet enters roughing mill advance horizontal high voltage water dephosphorization (before namely entering BD1 frame), rolling start rolling temperature 1228 DEG C, soaking zone temperature 1242 DEG C, first heating zone temperature 1217 DEG C, second heating zone temperature 1110 DEG C, cogging temperature 1125 DEG C before BD1, rolling specs H300 × 300 × 10 × 15, finishing temperature 910 DEG C, temperature on cooling table 695 DEG C.The H profile steel mechanical property parameters, the inclusion that obtain and organize as shown in Tables 1 and 2:
Table 1 mechanical properties value
Table 2 inclusion and tissue
Embodiment 2:
The chemical component weight per-cent of steel is: C 0.14%, Si 0.25%, Mn 1.35%, P0.020%, S0.015%, B0.0012% all the other be Fe; Production method comprises 150t converter, external refining, continuous casting, heating, BD cogging, universal rolling successively.The parameter of each step is: adopt 150t converter smelting, it is 1650 DEG C that converter terminal C 0.11%, P 0.025%, S 0.024% controls converter terminal tapping temperature; Slag charge is joined and alloy addition comprises: lime 325 kilograms, silicomanganese 150 kilograms, vanadium nitrogen iron 10 kilograms, 51 kilograms, aluminium ferromanganese during external refining; LF temperature in place 1518 DEG C, LF offs normal temperature 1588 DEG C, heat-up time 22min, LF refining time 43 minutes; Wherein LF molten steel composition weight percent in place is C0.16%, Si0.0.20%, Mn1.2%, P0.020%, S0.014%, B0.011%; LF molten steel composition weight percent of offing normal is C 0.14%, Si 0.28%, Mn 1.32%, P0.019%, S0.015%, B0.0012%; Soft blow time 15min ensures that inclusion fully floats; Teeming temperature 1577 DEG C during continuous casting, continuous casting superheating temperature 30 DEG C, average pull rate is 0.95m/min; Steelworks ensures that steel billet is sent to Steel Mill without after surface quality and internal soundness; The strand that shaped blank is of a size of 555mm × 440mm by Steel Mill again carries out visual inspection before entering process furnace, have scab, crackle, the steel billet that sticks up skin choose; Furnace temp is 1270 DEG C; 2.8 hours heat-up times, be weak reducing atmosphere in soaking 50min process furnace, steel billet enters roughing mill advance horizontal high voltage water dephosphorization (before namely entering BD1 frame), rolling start rolling temperature 1218 DEG C, soaking zone temperature 1243 DEG C, first heating zone temperature 1229 DEG C, second heating zone temperature 1113 DEG C, cogging temperature 1128 DEG C before BD1, rolling specs H300 × 300 × 10 × 15, finishing temperature 924 DEG C, temperature on cooling table 730 DEG C.The H profile steel mechanical property parameters, the inclusion that obtain and organize as shown in Tables 3 and 4:
Table 3 mechanical properties value
Table 4 inclusion and tissue
Above-described embodiment is only be described the preferred embodiment of the present invention; not scope of the present invention is limited; under not departing from the present invention and designing the prerequisite of spirit; the various distortion that those of ordinary skill in the art make technical scheme of the present invention and improvement, all should fall in protection domain that claims of the present invention determines.
Claims (5)
1. a low cost S M490C is hot rolled H-shaped, it is characterized in that the chemical composition of described H profile steel and weight percent content thereof are: C 0.14 ~ 0.18%, Si 0.25 ~ 0.40%, Mn 1.35 ~ 1.50%, P≤0.03%, S≤0.020%, B0.001 ~ 0.002%, all the other are Fe.
2. low cost S M490C according to claim 1 is hot rolled H-shaped, it is characterized in that: the tensile strength of described H profile steel is 490MPa ~ 610MPa, yield strength >=325MPa, unit elongation >=30%, hot rolled H-shaped finished product wing plate 20 DEG C of impact >=100J, 0 DEG C of low-temperature impact >=80J.
3. prepare the method that low cost S M490C as claimed in claim 1 or 2 is hot rolled H-shaped, it is characterized in that comprising the following steps: converter, LF refining, continuous beam blank casting, casting billet surface cleaning, Rolling With Universal Mill H profile steel, aligning.
4. the preparation method that low cost S M490C according to claim 3 is hot rolled H-shaped, it is characterized in that the parameter of each step is: weight percent >=0.06% of converter terminal control C during smelting, weight percent≤0.025% of P, controls tapping temperature and is greater than 1640 DEG C; Alloying adopts silicomanganese and manganeseirom, and end-deoxidizer adopts aluminium calcium barium and aluminium ferromanganese; Refining white slag operates; Continuous casting liquidus temperature: TL=1512 DEG C; Molten steel overheat Δ T≤30 DEG C; Permanent pulling rate is adopted to operate; Rolling start rolling temperature 1150 ± 50 DEG C, after BD cogging, CCS universal mill is rolled, temperature 880 DEG C ~ 930 DEG C before CCS finishing rolling mill.
5. the preparation method that low cost S M490C according to claim 4 is hot rolled H-shaped, is characterized in that: after refining, molten steel composition target value is weight percentage: C 0.16%, Si 0.30%, Mn 1.40%, P≤0.025%, S≤0.015%, B0.0012%, all the other are Fe.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107299283A (en) * | 2017-05-27 | 2017-10-27 | 内蒙古包钢钢联股份有限公司 | Depth low temperature resistant hot rolled H-shaped and its production technology |
| CN108411191A (en) * | 2018-03-02 | 2018-08-17 | 山东钢铁股份有限公司 | A kind of 500MPa grades of H profile steels of normalizing rolling yield strength and preparation method thereof |
| CN109338227A (en) * | 2018-11-21 | 2019-02-15 | 包头钢铁（集团）有限责任公司 | Low temperature resistant H profile steel of a kind of 275MPa grades of boracic hot rolling and preparation method thereof |
| CN110468336A (en) * | 2019-09-23 | 2019-11-19 | 包头钢铁（集团）有限责任公司 | A kind of low strain dynamic aging sensitivity steel for welded structures and its preparation process |
| CN115094308A (en) * | 2022-06-02 | 2022-09-23 | 包头钢铁（集团）有限责任公司 | Micro-alloy-element-free low-cost small-specification Q355B hot-rolled H-shaped steel and production method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103589951A (en) * | 2013-11-01 | 2014-02-19 | 内蒙古包钢钢联股份有限公司 | Large section H shaped steel and its production method |
| CN103820706A (en) * | 2013-12-12 | 2014-05-28 | 山西新泰钢铁有限公司 | Hot-rolling H-shaped steel containing and vanadium boride and having excellent low-temperature impacttoughness and preparation method of hot-rolling H-shaped steel |
| CN104032217A (en) * | 2014-06-19 | 2014-09-10 | 马钢(集团)控股有限公司 | Hot-rolled H-shaped steel, and application and production method thereof |
-
2015
- 2015-04-13 CN CN201510171791.9A patent/CN104789856A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103589951A (en) * | 2013-11-01 | 2014-02-19 | 内蒙古包钢钢联股份有限公司 | Large section H shaped steel and its production method |
| CN103820706A (en) * | 2013-12-12 | 2014-05-28 | 山西新泰钢铁有限公司 | Hot-rolling H-shaped steel containing and vanadium boride and having excellent low-temperature impacttoughness and preparation method of hot-rolling H-shaped steel |
| CN104032217A (en) * | 2014-06-19 | 2014-09-10 | 马钢(集团)控股有限公司 | Hot-rolled H-shaped steel, and application and production method thereof |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107299283A (en) * | 2017-05-27 | 2017-10-27 | 内蒙古包钢钢联股份有限公司 | Depth low temperature resistant hot rolled H-shaped and its production technology |
| CN108411191A (en) * | 2018-03-02 | 2018-08-17 | 山东钢铁股份有限公司 | A kind of 500MPa grades of H profile steels of normalizing rolling yield strength and preparation method thereof |
| CN109338227A (en) * | 2018-11-21 | 2019-02-15 | 包头钢铁（集团）有限责任公司 | Low temperature resistant H profile steel of a kind of 275MPa grades of boracic hot rolling and preparation method thereof |
| CN110468336A (en) * | 2019-09-23 | 2019-11-19 | 包头钢铁（集团）有限责任公司 | A kind of low strain dynamic aging sensitivity steel for welded structures and its preparation process |
| CN115094308A (en) * | 2022-06-02 | 2022-09-23 | 包头钢铁（集团）有限责任公司 | Micro-alloy-element-free low-cost small-specification Q355B hot-rolled H-shaped steel and production method thereof |
| CN115094308B (en) * | 2022-06-02 | 2023-06-23 | 包头钢铁（集团）有限责任公司 | Microalloy element-free low-cost small-specification Q355B hot rolled H-shaped steel and production method thereof |
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