CN104789869A - Novel H-shaped steel for no-galvanization electrified railway touching net post and preparation method thereof - Google Patents
Novel H-shaped steel for no-galvanization electrified railway touching net post and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a novel H-shaped steel for a no-galvanization electrified railway touching net post and a preparation method thereof. The preparation method comprises the following steps: performing hot metal pretreatment on the H-shaped steel; smelting in a converter; performing LF refining; performing VD vacuum refining; performing continuous casting on beam blank; heating in a stepping heating furnace; dephosphorizing by high pressure water; performing BD1 rolling; performing CCS continuous rolling; performing saw cutting; sampling; preflexing in cooling bed; cropping head and tail end; straightening; detecting; bundling; and warehousing. The H-shaped steel is composed of the following chemicals by weight percentage: 0.09-0.12% of C, 0.15-0.40% of Si, 0.35-0.65% of Mn, less than or equal to 0.020% of P, less than or equal to 0.015% of S, 0.35-0.50% of Cu, 0.30-0.45% of Ni, 0.15-0.20% of Ti and the balance of Fe. The economical novel H-shaped steel for the no-galvanization electrified railway touching net post used in any environment is provided.
Description
Technical field
The present invention relates to metallurgical material field, particularly relate to zinc-plated pillar of electrification rail contacting net H profile steel of a kind of Novel free and preparation method thereof.
Background technology
In today of world's railway high speed development, railway electrification is the important directions of modern railways development.Contact system is that electric locomotive or electric EMU specific to electric railway and urban track traffic provide electric energy and without power-supply unit for subsequent use.Catenary mast is as the important component part of contact net system, and its intensity and reliability are directly connected to the traffic safety of train.Along with the raising of special line for passenger trains overall trip speed, to the requirement also increasingly stringent of catenary mast, not only need safe and reliable, economy is also important Consideration, and along with this idea of Sustainable development of economy is goed deep into, the environmental effect of contact system also takes in as an importance.In recent years, railway construction in China was carried out on a large scale.The important step that PDL Construction is built as state-owned railroads, a lot of technical problem need solve.The type selecting of PDL Catenary pillar, after considering safety, the factor such as reliable, economic and attractive in appearance, in conjunction with domestic and international catenary mast application, can be applied hot rolled H-shaped as pillar on Line for Passenger Transportation.
H profile steel pillar not only good looking appearance and deformed bar mixes and manufactures compared with earth pillar simple, and a column capacity is large.H profile steel pillar is adopted by big area on world's high-speed railway.The high-speed railway of the states such as France, Japan, Britain, Korea S all adopts section Steel Column, and the viaduct of Germany also adopts section Steel Column.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of economy, any environment can be used under the zinc-plated pillar of electrification rail contacting net H profile steel of Novel free and preparation method thereof.
For reaching above-mentioned purpose, the zinc-plated pillar of electrification rail contacting net H profile steel of a kind of Novel free of the present invention, its chemical weight percent consists of: C 0.09 ~ 0.12%, Si 0.15 ~ 0.40%, Mn0.35 ~ 0.65%, P≤0.020%, S≤0.015%, Cu 0.35 ~ 0.50%, Ni 0.30 ~ 0.45%, Ti 0.15 ~ 0.20%, all the other are Fe element.
A kind of method preparing the zinc-plated pillar of electrification rail contacting net H profile steel of described Novel free, comprise the following steps: hot metal pretreatment → converter smelting → LF refining → VD vacuum refinement → continuous casting special-shaped base, wherein in converter smelting, LF refining, continuous casting production process, corresponding technological measure comprises: control converter enter silicone content≤0.015% in stove molten iron, improve Tapping Temperature of Bof to 1650 DEG C, control converter under the quantity of slag 1.5% ~ 2.0%, extend LF stove refining time 40 ~ 45min and continuous casting low pulling rate cast 0.6m/min ~ 0.9m/min; LF heat-up time and refining time are respectively 25min and 45min, and VD stove argon blowing time is no less than 14min, and the pulling rate scope of continuous caster is 0.6m/min ~ 0.9m/min, and the superheating temperature of steel grade is less than 25 DEG C, specific water 0.25L/mg.
Wherein steelworks smelts qualified Hot Metal in Beam Blank, mails to beam-and-rail factory through following steps to be: Hot Metal in Beam Blank → walking beam furnace heating → dephosphorize by high pressure water → BD1 rolling → CCS tandem rolling → sawing → sampling → cold bed pre-bending → crop end → aligning → inspection → bundling → warehouse-in; Wherein billet heating temperature is 1210 ~ 1260 DEG C; Start rolling temperature≤1150 DEG C, finishing temperature 870 ~ 910 DEG C.
The invention difference from existing technology is that the present invention achieves following technique effect:
All need to electroplate one deck zinc at H profile steel outside surface for pillar of electrification rail contacting net H profile steel now, prevent H profile steel outside surface to be directly exposed in air and be corroded.This adds increased H profile steel as the cost of pillar of electrification rail contacting net and production cycle, in price, advantage is lost with the product that other is used as pillar, the present invention is in the design process of material, reduce C content, add the alloys such as Cu and Ni, material itself is made to have good welding property and weather-resistant performance, in the process making pillar, direct removal iron scale, spray paint enhancing aesthetic, not be used in H profile steel surface galvanizing, so not only saved cost of manufacture but also be conducive to environmental protection.By controlling steel-making and the operation of rolling, the intensity of H profile steel can be improved.By the chemical composition of appropriate design H profile steel, H profile steel can be solved for needing zinc-plated problem before pillar of electrification rail contacting net.The present invention adopts the rolling of continuous casting special-shaped base, decreases the time of split rolling method, improves production efficiency.The present invention prepares the zinc-plated pillar of electrification rail contacting net H profile steel of Novel free, there is intensity high, the features such as welding property better and erosion resistance is strong, meet the service requirements of pillar of electrification rail contacting net, can be used in electric railway construction on a large scale, possess that production efficiency is high, energy-conserving and environment-protective, good looking appearance, have good popularizing value.
Embodiment
Below in conjunction with embodiment, to above-mentioned being described in more detail with other technical characteristic and advantage of the present invention.
The production technique of the novel pillar of electrification rail contacting net H profile steel of the present invention: hot metal pretreatment → converter smelting → LF refining → VD vacuum refinement → continuously cast bloom.Corresponding technological measure is taked in converter steelmaking, external refining, continuous casting production process, comprise: control converter enter w [S]≤0.015% in stove molten iron, improve Tapping Temperature of Bof to 1650 DEG C about, control the quantity of slag under converter, extend LF stove refining time and the low pulling rate cast of continuous casting etc., produce up-to-standard continuously cast bloom.LF heat-up time and refining time are respectively 25min and 45min, and VD stove argon blowing time is no less than 14min, and the scope of the pulling rate of continuous caster is 0.6m/min ~ 0.9m/min, and the superheating temperature of casting is less than 25 DEG C, specific water 0.25L/mg.Following embodiment main chemical compositions is as shown in table 1.
The each embodiment main chemical compositions of table 1 (mass percent/%)
The rolling technology of pillar of electrification rail contacting net H profile steel is: Hot Metal in Beam Blank → walking beam furnace heating → dephosphorize by high pressure water → BD1 rolling → BD2 rolling → dephosphorize by high pressure water → CCS tandem rolling → sawing → sampling → cold bed pre-bending → crop end → aligning → inspection → bundling → warehouse-in.Its billet heating temperature is 1210 ~ 1260 DEG C; Start rolling temperature≤1150 DEG C, finishing temperature 870 ~ 910 DEG C.
Experiment samples the example 4 come from table one.Wherein tension specimen specification is, gauge length L0=50mm, diameter D=10mm.Shock test adopts the 10mmxl0mmx55mm summer than v-notch sample, and test temperature is 5 DEG C, 20 DEG C of soil, and experimental result is as shown in table 2.
The each embodiment mechanical property of table 2
As can be seen from 2, each example has good strength, toughness and mechanical property.
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 (3)
1. the zinc-plated pillar of electrification rail contacting net H profile steel of Novel free, it is characterized in that its chemical weight percent consists of: C 0.09 ~ 0.12%, Si 0.15 ~ 0.40%, Mn0.35 ~ 0.65%, P≤0.020%, S≤0.015%, Cu 0.35 ~ 0.50%, Ni 0.30 ~ 0.45%, Ti 0.15 ~ 0.20%, all the other are Fe element.
2. prepare the method for the zinc-plated pillar of electrification rail contacting net H profile steel of Novel free as claimed in claim 1 for one kind, it is characterized in that comprising the following steps: hot metal pretreatment → converter smelting → LF refining → VD vacuum refinement → continuous casting special-shaped base, wherein converter smelting, LF refining, in continuous casting production process, corresponding technological measure comprises: control converter and enter silicone content≤0.015% in stove molten iron, improve Tapping Temperature of Bof to 1650 DEG C, under controlling converter, the quantity of slag is 1.5% ~ 2.0%, extend LF stove refining time 40 ~ 45min and continuous casting low pulling rate cast 0.6m/min ~ 0.9m/min, LF heat-up time and refining time are respectively 25min and 45min, and VD stove argon blowing time is no less than 14min, and the pulling rate scope of continuous caster is 0.6m/min ~ 0.9m/min, and the superheating temperature of steel grade is less than 25 DEG C, specific water 0.25L/mg.
3. the preparation method of the zinc-plated pillar of electrification rail contacting net H profile steel of Novel free according to claim 1, it is characterized in that its steelworks smelts qualified Hot Metal in Beam Blank, mailing to beam-and-rail factory through following steps is: Hot Metal in Beam Blank → walking beam furnace heating → dephosphorize by high pressure water → BD1 rolling → CCS tandem rolling → sawing → sampling → cold bed pre-bending → crop end → aligning → inspection → bundling → warehouse-in; Wherein billet heating temperature is 1210 ~ 1260 DEG C; Start rolling temperature≤1150 DEG C, finishing temperature 870 ~ 910 DEG C.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102586684A (en) * | 2012-02-28 | 2012-07-18 | 莱芜钢铁集团有限公司 | H-shaped steel for nuclear power structure and manufacturing method of H-shaped steel |
| CN102676927A (en) * | 2012-06-12 | 2012-09-19 | 钢铁研究总院 | High-Ti micro-alloyed medium thickness steel plate and preparation method thereof |
| CN103484764A (en) * | 2013-09-11 | 2014-01-01 | 首钢总公司 | Ti precipitation strengthening type ultra-high-strength hot rolling thin plate and production method thereof |
| 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 |
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- 2015-04-30 CN CN201510212221.XA patent/CN104789869A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102586684A (en) * | 2012-02-28 | 2012-07-18 | 莱芜钢铁集团有限公司 | H-shaped steel for nuclear power structure and manufacturing method of H-shaped steel |
| CN102676927A (en) * | 2012-06-12 | 2012-09-19 | 钢铁研究总院 | High-Ti micro-alloyed medium thickness steel plate and preparation method thereof |
| CN103484764A (en) * | 2013-09-11 | 2014-01-01 | 首钢总公司 | Ti precipitation strengthening type ultra-high-strength hot rolling thin plate and production method thereof |
| 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 |
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