CN104294149A - 350MPa-level low temperature resistant H-shaped steel and preparation method thereof - Google Patents
350MPa-level low temperature resistant H-shaped steel and preparation method thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/06—Deoxidising, e.g. killing
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
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Abstract
The invention belongs to the technical field of steel, and particularly relates to 350MPa-level low temperature resistant H-shaped steel and a preparation method thereof. The 350MPa-level low temperature resistant H-shaped steel comprises the following chemical components in percentage by weight: 0.05-0.09% of carbon, 0.20-0.35% of silicon, 1.35-1.50% of manganese, 0.020-0.035% of niobium, 0.015-0.025% of vanadium, 0.005-0.025% of titanium, smaller than and equal to 0.020% of phosphorus, smaller than and equal to 0.015% of sulfur, and iron and inevitable impurities for balance. According to the 350MPa-level low temperature resistant H-shaped steel and the preparation method thereof, mainly through the low carbon content, and the application of niobium-titanium complex microalloying technology, the production of the 350MPa-level low temperature resistant H-shaped steel is realized; a prepared product has a yielding strength larger than 380 MPa, is good in low temperature resistant steel mechanical property, and has low-temperature (minus 40 DEG C) resistant longitudinal impact power larger than 76 J.
Description
Technical field
The invention belongs to iron and steel technical field, particularly, the present invention relates to a kind of 350MPa level low temperature resistant hot rolled H-shaped and preparation method thereof.
Background technology
Low temperature resistant H profile steel is mainly used in the steel construction piece of the building of extremely frigid zones, boats and ships, bridge, power station equipment, water conservancy, the energy, chemical industry, handling machinery and other high loads.The non-metallic material that these steel are mingled with is few, has the feature of impact resistance under cryogenic.
Chinese invention patent application CN101255527A disclose a kind of there is favorable low-temperature impact toughness add boron H profile steel and preparation method thereof, this invention composition of steel weight percent is: C0.08 ~ 0.20%, Mn1.00 ~ 1.60%, Si0.10 ~ 0.55%, P≤0.025%, S≤0.025%, Nb0.015 ~ 0.035%, B0.0005 ~ 0.0012%, surplus is iron and trace impurity, in smelting process, control the gas content [N]≤0.004% in steel, [O]≤0.0060%, this invention is mainly by adding trace B to the advantageous effect of steel toughness as suppressed phosphorus, sulphur segregation and grain boundary fracture, improve the form and distribution etc. of inclusion.But need to keep lower nitrogen, oxygen level, adopt aluminium deoxidation, the deoxidation effect that guarantee is good.Due to the complicacy in shaped steel cross section, when adopting aluminium deoxidation in smelting process, easily in casting process, there is " cover eye " problem, destroy the continuity that steel making working procedure is produced.
Chinese invention patent application CN1421286A discloses a kind of rolling method containing niobium steel H profile steel, and this invents the product related to is resistance to-20 DEG C of low-temperature impact works.But its production process needs the low temperature controlled rolling carried out within the scope of 850 ~ 920 DEG C, produce the horizontal control overflow of equipment and technics strict.
Summary of the invention
The object of the present invention is to provide a kind of 350MPa level low temperature resistant hot rolled H-shaped, this low temperature resistant hot rolled H-shaped good mechanical properties, product yield strength in kind is greater than 380MPa, and-40 DEG C of impact of collision merits are greater than 76J.
To achieve these goals, present invention employs following technical scheme:
350MPa level of the present invention is low temperature resistant hot rolled H-shaped, its chemical composition is by weight percentage: C:0.05% ~ 0.09%, Si:0.20% ~ 0.35%, Mn:1.35% ~ 1.50%, Nb:0.020% ~ 0.035%, V:0.015% ~ 0.025%, Ti:0.005% ~ 0.025%, P≤0.020%, S≤0.015%, and all the other are iron and inevitable impurity.
Preferably, above-mentioned low temperature resistant hot rolled H-shaped chemical composition is by weight percentage: C:0.05% ~ 0.08%, Si:0.20% ~ 0.30%, Mn:1.35% ~ 1.45%, Nb:0.020% ~ 0.030%, V:0.018% ~ 0.025%, Ti:0.005% ~ 0.020%, P≤0.020%, S≤0.015%, and all the other are iron and inevitable impurity.
The low temperature resistant hot rolled H-shaped preparation method of above-mentioned 350MPa level of the present invention, comprises the following steps:
1) molten iron pre-desulfurization: ensure the sulphur content≤0.008wt% in molten iron after desulfurization;
2) converter smelting: adopt ferrosilicon, manganese metal and ferro-niobium to carry out alloying, alloying constituent controls by middle limit;
3) LF refining: abundant stirringization slag in refining process, makes yellowish-white slag;
4) continuous casting: whole process protection is poured into a mould, guarantees that large bag extension long nozzle is opened and waters;
5) rolling: be rolled into H profile steel.
Further particularly, the low temperature resistant hot rolled H-shaped preparation method of above-mentioned 350MPa level also preferably includes following steps:
Preferably, in converter smelting step, ladle adopts red-face role's magnesia carbon brick bag, storing temperature >=800 DEG C; Adopt ferrosilicon, manganese metal and ferro-niobium to carry out alloying, alloying constituent controls by middle limit; Adopt aluminium manganese-ferro deoxidation, add-on 2.5 ~ 4.0kg/t steel; Add slag modification agent 1.0kg/t steel in tapping process, when molten steel go out to 1/4 time start evenly to add alloy, molten steel go out to 3/4 time add, alloy aim at steel stream impact zone add.
Preferably, LF refinement step also comprise adopt carbide of calcium, Si-Ca-Ba, aluminum shot carry out residue adjustment, add-on is carbide of calcium 1.5 ~ 2.5kg/t steel, Si-Ca-Ba 2.0 ~ 3.0kg/t steel, and adds aluminum shot deoxidation depending on slag condition.
Preferably, LF refinement step also comprise get first sample after adjust oxygen position and determine oxygen to [O] < 20ppm, feeding titanium wire, titanium wire feed quantity 1.2 ~ 2.4m/t steel, wire-feeding velocity is not less than 3m/s.
Preferably, LF refinement step feeds CaFe line before also comprising refining soft blow argon, and CaFe line feed quantity is 100 ~ 150m/ stove; Keep the little argon gas amount of top of the slag fine motion to stir more than 10min after refining, wherein, the little argon gas amount of described top of the slag fine motion refers to that argon flow amount is 50 ~ 150NL/min.
Preferably, in continuous casting step, baking of tundish temperature is 1100 DEG C, and crystallizer, to arc, uses whole process protection cast.Wherein, further preferably, two cold employings are weak cold, crystallizer adopts non-sinusoidal oscillation, and tundish adopts low-carbon (LC) alkaline covering agent, and insulating covering agent add-on is 1 ~ 1.5kg/t steel, liquidus temperature is 1518 DEG C, tundish superheating temperature is by 20 ~ 25 DEG C of controls, and casting blank specification is 240mm × 375mm, and pulling rate is 0.6 ~ 0.9m/min.
Preferably, in milling step, the soaking temperature of process furnace is 1220 ~ 1260 DEG C, and strand time inside furnace is 90 ~ 120min; Start rolling temperature is 1170 DEG C outside the edge of a wing, be 1150 DEG C in web central authorities, finishing temperature is 950 DEG C outside the edge of a wing, be 830 DEG C in web central authorities, and stocking is at cold bed naturally cooling, and the specification of stocking can be preferably H248 × 124H shaped steel.
The present invention is mainly through low carbon content, and application niobium titanium-combined microalloying technique, achieves the low temperature resistant hot rolled H-shaped products production of 350MPa level under high finishing temperature condition.
According to the embodiment of the present invention; the preparation method of the low temperature resistant H profile steel of 350MPa level comprises desulfurization, converter smelting (such as; 120 tons of top and bottom combined blown converter smeltings), LF refining, square parison full guard continuous casting, rolling (such as, the rolling of 1-7 milling train layout pattern production line).
Specifically, in the preparation method of the low temperature resistant H profile steel of 350MPa level according to the embodiment of the present invention, casting process adopts the casting of long nozzle whole process protection.
The NM operation of the present invention, all can adopt prior art.
With the low temperature resistant hot rolled H-shaped comparision of production of current 350MPa level, the advantage of technical solution of the present invention is:
1., under the present invention adopts long nozzle whole process protection casting condition, produce low temperature resistant High Strength Structural Steel;
2. the present invention adopts manganese metal to carry out alloying, effectively can reduce the impure converter carburetting caused of alloy, guarantee the requirement of molten steel low-carbon (LC), improves product resistance to low temperature in kind.
3. niobium titanium-combined microalloying technique, steel making working procedure technology controlling and process is simple, and alloy recovery is stablized, and the operation of rolling does not need to carry out low temperature controlled rolling, do not control cold after rolling and do not heat-treat, completing Composition Design and the production of the H profile steel of 350MPa level low temperature resistant (-40 DEG C) ballistic work.
4. by composition adjustment, solving original steel-making, steel rolling equipment is process aging, be difficult to the difficult problem adapting to high added value shaped steel products production, laying the foundation for realizing the transformation of general carbon Section Steel Production alignment high-performance type steel production line.
5. resistance to low temperature of the present invention is good, and-40 DEG C of ballistic works are greater than 76J.
Accompanying drawing explanation
Fig. 1 is the process flow sheet of the low temperature resistant hot rolled H-shaped preparation of the present invention.
Embodiment
With the drawings and specific embodiments, the present invention is further detailed explanation below.
Embodiment 1
As shown in Figure 1, the low temperature resistant hot rolled H-shaped operational path of a kind of 350MPa level is:
Molten iron pre-desulfurization → converter smelting → LF refining → square parison full guard continuous casting → 1-7 milling train layout pattern production line rolling → inspection warehouse-in.
Be specially:
1) molten iron is to desulfurization station, ensures that the sulphur content in molten iron is≤0.008wt% after desulfurization;
2) converter smelting: ladle adopts red-face role's magnesia carbon brick bag, storing temperature >=800 DEG C; Adopt ferrosilicon, manganese metal, ferro-niobium to carry out alloying, alloying constituent controls by middle limit; Adopt aluminium manganese-ferro deoxidation, add-on 2.5 ~ 4.0kg/t steel; Add slag modification agent 1.0kg in tapping process, when molten steel go out to 1/4 time start evenly to add alloy, molten steel go out to 3/4 time add, alloy aim at steel stream impact zone add;
3) LF refining: adopt carbide of calcium, Si-Ca-Ba, aluminum shot to carry out residue adjustment, add-on is carbide of calcium 1.5 ~ 2.5kg/t steel, Si-Ca-Ba 2.0 ~ 3.0kg/t steel, and adds appropriate aluminum shot deoxidation depending on slag condition; Oxygen is determined after getting first sample, e.g., feeding titanium wire 1.2 ~ 2.4m/t steel, as oxygen position can not reach requirement, then adjust oxygen position and feed titanium wire to [O] < 15ppm, wire-feeding velocity is not less than 3m/s, feed CaFe line before refining soft blow argon, CaFe line feed quantity is 100 ~ 150m/ stove; Keep the little argon gas amount of top of the slag fine motion to stir more than 12min after refining, wherein, the little argon gas amount of described top of the slag fine motion refers to that argon flow amount is 50 ~ 150NL/min;
4) continuous casting: baking of tundish temperature is 1100 DEG C, crystallizer, to arc, uses whole process protection cast, wherein, two cold employings are weak cold, crystallizer adopts non-sinusoidal oscillation, and tundish adopts low-carbon (LC) alkaline covering agent, and insulating covering agent add-on is 1 ~ 1.5kg/t steel, liquidus temperature is 1517 DEG C, tundish superheating temperature is by 18 ~ 23 DEG C of controls, and casting blank specification is 240mm × 375mm, and pulling rate is 0.6 ~ 0.9m/min;
5) soaking temperature of process furnace is 1220 ~ 1260 DEG C, strand time inside furnace is 90 ~ 120min, start rolling temperature is 1170 DEG C outside the edge of a wing, be 1150 DEG C in web central authorities, finishing temperature is 950 DEG C outside the edge of a wing, be 830 DEG C in web central authorities, stocking is at cold bed naturally cooling, and the specification of stocking is H244 × 175H shaped steel.
The chemical component weight per-cent of gained steel is in table 1, and stocking mechanical property recorder is in table 2.
The product of this embodiment has higher intensity and good resistance to low temperature, wherein intensity comparatively service requirements height 50MPa,-40 DEG C of minimum 76J of cold impact value, average 86.7J, represent that product of the present invention still has excellent toughness-40 DEG C time, can guarantee to use the safety in utilization of the structure of this production under-40 DEG C of environment.
Table 1: the chemical component weight per-cent % of steel
| Embodiment | C | Si | Mn | P | S | V | Nb | Ti |
| 1 | 0.09 | 0.35 | 1.5 | 0.015 | 0.005 | 0.015 | 0.035 | 0.025 |
Table 2: stocking mechanical property recorder
Embodiment 2
The specification of the technological process of production, key control point and stocking is identical with embodiment 1.The chemical component weight per-cent of gained steel is in table 3, and stocking mechanical property recorder is in table 4.
The product of this embodiment has higher intensity and good resistance to low temperature, wherein intensity comparatively service requirements height 30MPa ,-40 DEG C of minimum 122J of cold impact value, average 138.0J, represents that product of the present invention still has excellent toughness-40 DEG C time.Although this enforcement product strength is comparatively implemented 1 low, its resistance to low temperature is more excellent can be guaranteed to use the safety in utilization of the structure of this production under-40 DEG C of environment.
Table 3: the chemical component weight per-cent % of steel
| Embodiment | C | Si | Mn | P | S | V | Nb | Ti |
| 2 | 0.05 | 0.2 | 1.45 | 0.012 | 0.006 | 0.035 | 0.02 | 0.015 |
Table 4: stocking mechanical property recorder
Embodiment 3
The specification of the technological process of production, key control point and stocking is identical with embodiment 1.The chemical component weight per-cent of gained steel is in table 5, and stocking mechanical property recorder is in table 6.
The product of this embodiment has higher intensity and good resistance to low temperature, wherein intensity comparatively service requirements height 35MPa,-40 DEG C of minimum 84J of cold impact value, average 111.3J, represent that product of the present invention still has excellent toughness-40 DEG C time, can guarantee to use the safety in utilization of the structure of this production under-40 DEG C of environment.
Table 5: the chemical component weight per-cent % of steel
| Embodiment | C | Si | Mn | P | S | V | Nb | Ti |
| 3 | 0.08 | 0.35 | 1.35 | 0.015 | 0.005 | 0.02 | 0.025 | 0.015 |
Table 6: stocking mechanical property recorder
Embodiment 4
The specification of the technological process of production, key control point and stocking is identical with embodiment 1.The chemical component weight per-cent of gained steel is in table 7, and stocking mechanical property recorder is in table 8.
The product of this embodiment has higher intensity and good resistance to low temperature, wherein intensity comparatively service requirements height 30MPa,-40 DEG C of minimum 162J of cold impact value, average 204.7J, represent that product of the present invention still has excellent toughness-40 DEG C time, can guarantee to use the safety in utilization of the structure of this production under-40 DEG C of environment.
Table 7: the chemical component weight per-cent % of steel
| Embodiment | C | Si | Mn | P | S | V | Nb | Ti |
| 4 | 0.06 | 0.2 | 1.48 | 0.015 | 0.005 | 0.025 | 0.03 | 0.02 |
Table 8: stocking mechanical property recorder
Finally it should be noted that: above embodiment is the unrestricted technical scheme of the present invention in order to explanation only, although with reference to above-described embodiment to invention has been detailed description, those of ordinary skill in the art is to be understood that, still can modify to the present invention or equivalent replacement, and not departing from any modification or partial replacement of the spirit and scope of the present invention, it all should be encompassed in the middle of right of the present invention.
Claims (8)
1. a 350MPa level is low temperature resistant hot rolled H-shaped, it is characterized in that, the chemical composition of described H profile steel is by weight percentage: C:0.05% ~ 0.09%, Si:0.20% ~ 0.35%, Mn:1.35% ~ 1.50%, Nb:0.020% ~ 0.035%, V:0.015% ~ 0.025%, Ti:0.005% ~ 0.025%, P≤0.020%, S≤0.015%, and all the other are iron and inevitable impurity.
2. H profile steel according to claim 1, it is characterized in that, the chemical composition of described H profile steel is by weight percentage: C:0.05% ~ 0.08%, Si:0.20% ~ 0.30%, Mn:1.35% ~ 1.45%, Nb:0.020% ~ 0.030%, V:0.018% ~ 0.025%, Ti:0.005% ~ 0.020%, P≤0.020%, S≤0.015%, and all the other are iron and inevitable impurity.
3. H profile steel according to claim 1 and 2, is characterized in that, the yield strength of described H profile steel is greater than 380Mpa.
4. a preparation method for H profile steel described in claim 1 or 2, comprises the following steps:
1) molten iron pre-desulfurization: ensure the sulphur content≤0.008wt% in molten iron after desulfurization;
2) converter smelting: adopt ferrosilicon, manganese metal and ferro-niobium to carry out alloying, alloying constituent controls by middle limit;
3) LF refining: abundant stirringization slag in refining process, makes yellowish-white slag;
4) continuous casting: whole process protection is poured into a mould, guarantees that large bag extension long nozzle is opened and waters;
5) rolling: be rolled into H profile steel.
5. the preparation method of H profile steel according to claim 4, is characterized in that, described step 3) also comprise and use carbide of calcium, Si-Ca-Ba and aluminum shot to carry out residue adjustment.
6. the preparation method of H profile steel according to claim 4, is characterized in that, described step 3) also comprise get first sample after adjust oxygen position and determine oxygen to [O] < 20ppm, feeding titanium wire.
7. the preparation method of H profile steel according to claim 4, is characterized in that, described step 3) be also included in refining soft blow argon before feed CaFe line.
8. the preparation method of H profile steel according to claim 4, is characterized in that, described step 4) the baking of tundish temperature of continuous casting step is 1100 DEG C, crystallizer is to arc.
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Cited By (6)
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| CN105401075A (en) * | 2015-11-16 | 2016-03-16 | 山东钢铁股份有限公司 | 420 MPa-grade H-shaped steel and preparation method thereof |
| CN106148833A (en) * | 2015-03-30 | 2016-11-23 | 鞍钢股份有限公司 | Normalized 36 kg-level marine steel plate and production method thereof |
| 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 |
| CN109161799A (en) * | 2018-09-20 | 2019-01-08 | 山东钢铁股份有限公司 | A kind of pillar of electrification rail contacting net is with hot rolled H-shaped and preparation method thereof |
| CN109722502A (en) * | 2018-12-11 | 2019-05-07 | 山东钢铁股份有限公司 | A kind of smelting process for preventing boron-containing steel cracked in shaped blank web |
| CN111349853A (en) * | 2020-03-02 | 2020-06-30 | 河北津西钢铁集团股份有限公司 | Microalloy-treated hot-rolled H-shaped steel and rolling method thereof |
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| CN103834861A (en) * | 2014-03-20 | 2014-06-04 | 莱芜钢铁集团有限公司 | 320MPa low-temperature resistant hot-rolled H-shaped steel and preparation method thereof |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106148833A (en) * | 2015-03-30 | 2016-11-23 | 鞍钢股份有限公司 | Normalized 36 kg-level marine steel plate and production method thereof |
| CN105401075A (en) * | 2015-11-16 | 2016-03-16 | 山东钢铁股份有限公司 | 420 MPa-grade H-shaped steel and preparation method thereof |
| CN105401075B (en) * | 2015-11-16 | 2018-01-12 | 山东钢铁股份有限公司 | A kind of 420MPa levels H profile steel and preparation method thereof |
| 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 |
| CN109161799A (en) * | 2018-09-20 | 2019-01-08 | 山东钢铁股份有限公司 | A kind of pillar of electrification rail contacting net is with hot rolled H-shaped and preparation method thereof |
| CN109722502A (en) * | 2018-12-11 | 2019-05-07 | 山东钢铁股份有限公司 | A kind of smelting process for preventing boron-containing steel cracked in shaped blank web |
| CN109722502B (en) * | 2018-12-11 | 2020-12-29 | 山东钢铁股份有限公司 | Smelting method for preventing boron-containing steel from cracking in web plate of special-shaped blank |
| CN111349853A (en) * | 2020-03-02 | 2020-06-30 | 河北津西钢铁集团股份有限公司 | Microalloy-treated hot-rolled H-shaped steel and rolling method thereof |
| CN111349853B (en) * | 2020-03-02 | 2021-08-10 | 河北津西钢铁集团股份有限公司 | Rolling method for hot-rolled H-shaped steel by microalloy treatment |
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