CN104264030A - Dedicated low-temperature-resistant H-shaped steel for alpine region and preparation method thereof - Google Patents
Dedicated low-temperature-resistant H-shaped steel for alpine region and preparation method thereof Download PDFInfo
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- CN104264030A CN104264030A CN201410593202.1A CN201410593202A CN104264030A CN 104264030 A CN104264030 A CN 104264030A CN 201410593202 A CN201410593202 A CN 201410593202A CN 104264030 A CN104264030 A CN 104264030A
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Abstract
The invention belongs to the technical field of steel, and discloses a preparation method of dedicated low-temperature-resistant H-shaped steel for an alpine region. The preparation method comprises the following steps: 1) after preliminary desulfurization of molten iron, according to the steel component requirements of Canadian standards G 40.21-13, smelting in a converter, and conducting LF (Ladle Furnace) refining; 2) after refining, conducting a near-net-shape beam blank continuous casting to prepare H-shaped near-net-shape continuous casting blank; 3) placing the continuous casting blank in a furnace, heating the blank, taking the blank out of the furnace, and then descaling; 4) rolling the descaled blank, wherein the specifications and the permissible variation in dimension of the rolled product are in accordance with Chinese standards GB/T 1591-2008; 5) air-cooling on the rolled product, and straightening the product to obtain the low-temperature-resistant H-shaped steel. According to the actual use requirements of the shape steel in North America, the Canadian standards are combined with the Chinese standards, so that the dedicated H-shaped steel meeting the requirements of North America is designed, the shape steel meeting the Chinese standards is enabled to be possibly exported to North America, particularly Canada, and the cost for steel structure production units and departments can be reduced.
Description
Technical field
The invention belongs to iron and steel technical field, particularly, the present invention relates to special low temperature resistant H profile steel of a kind of extremely frigid zones and preparation method thereof.
Background technology
North America region Special H section steel is mainly used in the steel construction piece of the building of North America 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.
Component system described in above-mentioned patent document and the trade mark all adopt GB.Product described in this patent is mainly used in North America area, and its applied environment has the low feature of temperature, and simultaneously for reducing integrated member weight, product strength requires higher.The product of the preparation described in above-mentioned patent document is adopted to be difficult to meet practical application request.Limit by product application region, north America region steel adopts mark-on steel grade and mark-on specification usually, as produced by this, will cause and cause domestic shaped steel manufacturing enterprise frock input huge.
Summary of the invention
The present invention is directed to the deficiencies in the prior art, in order to meet extremely frigid zones, the especially user demand of the H profile steel of North America extremely frigid zones, provides special low temperature resistant H profile steel of a kind of extremely frigid zones and preparation method thereof.
This low temperature resistant hot rolled H-shaped good mechanical properties ,-40 DEG C of minimum 125J of impact of collision merit.
To achieve these goals, present invention employs following technical scheme:
The production of usual H profile steel product is in the standard production of making steel, steel rolling link is all employing one individual system, and such as, steel grades and performance perform GB, and dimensions, the permissible variation of steel also perform GB.The present invention has broken this pattern, and the steel grades that H profile steel adopts, product size and permissible variation adopt the standard of different system, and such as: steel grades and Performance-System perform Canadian standard, dimensions and permissible variation in dimension perform Chinese Industrial Standards (CIS).A product performs the standard of different system at different production links, in production, there is not been reported, for this reason, invention has been the innovation of production technique pattern, guarantees the smooth enforcement of production and the stable of quality product.
The preparation method of the special low temperature resistant H profile steel of extremely frigid zones of the present invention, comprises the following steps:
1) after molten iron pre-desulfurization according to the composition that the steel grade of Canadian standard G40.21-13 requires, carry out converter smelting; Then LF refining is carried out;
2) near-net-shape casting for shaped blank continuous operation is entered after refining, obtained H type near net shape continuous casting blank;
3) continuous casting material is entered after stove is heated to 1180 ~ 1280 DEG C and come out of the stove, then carry out de-scaling;
4) be rolled the blank having removed squama, rolled products specification and permissible variation in dimension perform Chinese Industrial Standards (CIS) GB/T1591-2008;
5) align after complete to rolling rolled piece product carries out air cooling, finally, rolled piece is cut dimensioning, obtained low temperature resistant H profile steel.
Particularly, the preparation method of the special low temperature resistant H profile steel of extremely frigid zones of the present invention, comprises molten iron pre-desulfurization, converter smelting, LF refining, continuous casting, rolling, air cooling, straightening step:
1) after molten iron pre-desulfurization according to Canadian standard G40.21-13 (Canadian standard 350W) steel grade require composition, carry out converter smelting; Then LF refining is carried out;
2) near-net-shape casting for shaped blank continuous operation is entered after refining, obtained H type near net shape continuous casting blank;
3) continuous casting material adopts cold charge mode or hot charging mode to enter stove, is heated to assigned temperature and comes out of the stove, temperature range 1180-1280 DEG C, then carry out high-pressure water descaling (except removing iron scale);
4) except the blank roller-way of complete squama delivers to roughing mill and finishing train, rolled products specification performs dimensions and permissible variation in dimension adopts Chinese Industrial Standards (CIS) GB/T 1591-2008;
5) on the rolled piece product that rolling is complete, cold bed carries out air cooling, when rolled piece is chilled to after below 100 DEG C, enters straightener and aligns, finally, rolled piece is cut dimensioning.
The trade mark and the chemical composition of Canadian standard G40.21-13 are as shown in table 1 below, and mechanical property requirements is as shown in table 2 below.
The chemical composition of table 1 Canadian standard G40.21-13
The performance requriements of table 2 Canadian standard G40.21-13
The dimensions of Chinese Industrial Standards (CIS) GB/T 1591-2008 is as shown in table 3 below, and its permissible variation in dimension is as shown in table 4 below.
The dimensions of table 3 Chinese Industrial Standards (CIS) GB/T 1591-2008
The permissible variation in dimension of table 4 Chinese Industrial Standards (CIS) GB/T 1591-2008
Present invention also offers the special low temperature resistant H profile steel of a kind of extremely frigid zones, described H profile steel is obtained by the preparation method of the special low temperature resistant H profile steel of above-mentioned extremely frigid zones.
The special low temperature resistant H profile steel of extremely frigid zones of the present invention, H profile steel steel grades, product size and permissible variation adopt the standard of different system, steel grades system and performance are Canadian standard G40.21-13, and dimensions and permissible variation in dimension perform Chinese Industrial Standards (CIS) GB/T 1591-2008.
H profile steel product described in this patent adopts hot rolling once shaped, and dimensional precision is high, may be used for alternative original welding shaped steel, has process-cycle short, metal and utilizes a little high.This product has higher intensity and good resistance to low temperature simultaneously, it has even, the stable feature of cross section performance simultaneously, significantly can reduce the risk of welding shaped steel and rupturing in commissure for alternative high quality welds shaped steel, improve the safety performance of integrated member.
The present invention is according to the actual user demand of north America region shaped steel, Canadian standard and Chinese Industrial Standards (CIS) are combined, design the Special H section steel meeting north America region, use Chinese Industrial Standards (CIS) shaped steel outlet North America especially Canada becomes possibility, both the performance requriements of product application had been met, significantly can reduce again the frock investment of Section Steel Production enterprise, the production unit and the department that can be steel construction save cost.
Accompanying drawing explanation
Fig. 1 is shape of product and the size indication figure of the low temperature resistant H profile steel of extremely frigid zones of the present invention; Wherein, h is height, and b is the edge of a wing, and s is web thickness, and t is edge of a wing thickness, and r is R angle, and X is transverse axis, and Y is the longitudinal axis.
Embodiment
With the drawings and specific embodiments, the present invention is further detailed explanation below.
Embodiment 1
Preparation technology:
According to the composition (G40.21-13) that Canadian standard 350W steel grade requires after molten iron pre-desulfurization, adopt 120 tons of converter smeltings, composition is as following table 5; In order to ensure purity and the molten steel composition stability of steel, adopting LF refining, making steel grades fully meet standard-required; Enter near-net-shape casting for shaped blank continuous operation after refining, produce H type near-net-shape (close to finished state) continuous casting material; Blank adopts cold charge mode or hot charging mode to enter stove, be heated to assigned temperature (1180 ~ 1280 DEG C) to come out of the stove, carry out high-pressure water descaling, except the blank roller-way of complete squama delivers to roughing mill and finishing train, rolled products specification and permissible variation in dimension perform Chinese Industrial Standards (CIS) (GB/T 1591-2008), and on the complete rolled piece of rolling, cold bed carries out air cooling.When rolled piece is chilled to after below 100 DEG C, enters straightener and align, the distortion caused due to air cooling is corrected.Finally, rolled piece cut scale, collect obtained low temperature resistant H profile steel product.Shape of product as shown in Figure 1.Product mechanical property is as shown in table 6 below.
This product has higher intensity and good resistance to low temperature, wherein intensity comparatively mark-on require high 30MPa,-40 DEG C of minimum 125J of cold impact value, average 155.3J, 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.
The H profile steel chemical composition of table 5 embodiment 1
The H profile steel mechanical property of table 6 embodiment 1
Embodiment 2
Preparation technology is with embodiment 1.
This product has higher intensity and good resistance to low temperature, wherein intensity comparatively mark-on require high 15MPa,-40 DEG C of minimum 195J of cold impact value, average 203.7J, 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.
Product composition is as shown in table 7 below; Product mechanical property is as shown in table 8 below.
The H profile steel chemical composition of table 7 embodiment 2
The H profile steel mechanical property of table 8 embodiment 2
Embodiment 3
Preparation technology is with embodiment 1.
This product has higher intensity and good resistance to low temperature, wherein intensity comparatively mark-on require high 50MPa,-40 DEG C of minimum 120J of cold impact value, average 145.3J, 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.
Product composition is as shown in table 9 below; Product mechanical property is as shown in table 10 below.
The H profile steel chemical composition of table 9 embodiment 3
The H profile steel mechanical property of table 10 embodiment 3
Embodiment 4
Preparation technology is with embodiment 1.
This product has higher intensity and good resistance to low temperature, wherein intensity comparatively mark-on require high 35MPa,-40 DEG C of minimum 185J of cold impact value, average 200.3J, 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.
Product composition is as shown in table 11 below; Product mechanical property is as shown in table 12 below.
The H profile steel chemical composition of table 11 embodiment 4
The H profile steel mechanical property of table 12 embodiment 4
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 (5)
1. a preparation method for the special low temperature resistant H profile steel of extremely frigid zones, comprises the following steps:
1) after molten iron pre-desulfurization according to the composition that the steel grade of Canadian standard G40.21-13 requires, carry out converter smelting; Then LF refining is carried out;
2) near-net-shape casting for shaped blank continuous operation is entered after refining, obtained H type near net shape continuous casting blank;
3) continuous casting material is entered after stove is heated to 1180 ~ 1280 DEG C and come out of the stove, then carry out de-scaling;
4) be rolled the blank having removed squama, rolled products specification and permissible variation in dimension perform Chinese Industrial Standards (CIS) GB/T1591-2008;
5) align after complete to rolling rolled piece product carries out air cooling, finally, rolled piece is cut dimensioning, obtained low temperature resistant H profile steel.
2. preparation method according to claim 1, is characterized in that, described step 3) adopted by continuous casting material cold charge mode or hot charging mode to enter stove.
3. preparation method according to claim 1, is characterized in that, described step 3) use dephosphorize by high pressure water.
4. preparation method according to claim 1, is characterized in that, described step 4) air cooling rolled piece is chilled to after below 100 DEG C and aligns.
5. the special low temperature resistant H profile steel of extremely frigid zones, is characterized in that, described H profile steel is obtained by the arbitrary described method of claim 1-4.
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Cited By (1)
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| CN110100029A (en) * | 2016-12-22 | 2019-08-06 | 株式会社Posco | The thick steel plate and its manufacturing method of high-intensity and high-tenacity |
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| CN102618782A (en) * | 2012-03-30 | 2012-08-01 | 莱芜钢铁集团有限公司 | Large-specification Z-direction H-steel and preparation method thereof |
| CN103484765A (en) * | 2013-09-12 | 2014-01-01 | 莱芜钢铁集团有限公司 | Thick low-temperature-resistant H-shaped steel for support of railway overhead contact system and preparing method thereof |
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| CN102618781A (en) * | 2012-03-30 | 2012-08-01 | 莱芜钢铁集团有限公司 | Hot-rolled H-steel for low temperature-resistance structure and preparation method for hot-rolled H-steel |
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| CN103484765A (en) * | 2013-09-12 | 2014-01-01 | 莱芜钢铁集团有限公司 | Thick low-temperature-resistant H-shaped steel for support of railway overhead contact system and preparing method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110100029A (en) * | 2016-12-22 | 2019-08-06 | 株式会社Posco | The thick steel plate and its manufacturing method of high-intensity and high-tenacity |
| JP2020509174A (en) * | 2016-12-22 | 2020-03-26 | ポスコＰｏｓｃｏ | High strength and high toughness thick steel plate and manufacturing method thereof |
| CN110100029B (en) * | 2016-12-22 | 2021-04-27 | 株式会社Posco | High-strength high-toughness thick steel plate and method for producing same |
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