CN104073717A - H-shaped steel as well as application and production method of H-shaped steel - Google Patents
H-shaped steel as well as application and production method of H-shaped steel Download PDFInfo
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- CN104073717A CN104073717A CN201410276218.XA CN201410276218A CN104073717A CN 104073717 A CN104073717 A CN 104073717A CN 201410276218 A CN201410276218 A CN 201410276218A CN 104073717 A CN104073717 A CN 104073717A
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Abstract
The invention relates to H-shaped steel as well as an application and a production method of the H-shaped steel. The production method comprises the process steps of: molten steel pretreatment; converter smelting; argon blowing station; LF refining; fully-protective beam blank casting; H-shaped steel wire A rolling. The steel comprises the following chemical components: 0.08-0.18% of carbon, 0.15-0.35% of silicon, 1.00-1.45% of manganese, less than or equal to 0.020% of phosphorus, less than or equal to 0.010% of sulfur, 0.020-0.080% of vanadium, 0.010-0.060% of niobium, 0.10-0.25% of nickel, more than or equal to 0.015% of Als and a trace amount of other alloy elements. The H-shaped steel with the specification of 300*200, which is produced by using the production method of the H-shaped steel with -40 DEG C low-temperature toughness and Z-direction performance, has the -40 DEG C low-temperature toughness of more than 150J and the average Z15-direction section reduction value of larger than 27.5% and has extremely low ductile-brittle transition temperature and relatively strong lamellar tearing resistant property, and the quality of the H-shaped steel is improved.
Description
Technical field
The invention belongs to metallic substance production technical field, be specifically related to a kind of H shaped steel production method for bridge with good low-temperature toughness and Z-direction performance.
Background technology
Because the security requirement of bridge is higher, user has higher requirement to the toughness of bridge steel plate and anti-lamellar tearing performance, as easy welding, low-temperature flexibility and anti-lamellar tearing performance, and the H shaped steel of producing according to the general H shaped steel technological process of production, its tough ductile-brittle transition temperature is-10 ℃ of left and right, as for extremely frigid zones and low temperature environment, when bearing dynamic load or impacting, easily there is brittle failure, cause unnecessary loss, for the H shaped steel of-40 ℃ and following environment, its low-temperature flexibility will meet the requirement of E level steel in GB/T714; And take Hot Metal in Beam Blank as raw material, adopt hot metal pretreatment, low temperature is depressed greatly measure is produced with cooling control after rolling etc. bridge H shaped steel, its S content, Z-direction performance and-40 ℃ of low-temperature flexibilities etc. can meet in GB/T714 the requirement of-40 ℃ of impact properties and Z-direction relative reduction in area.Meanwhile, adopt H shaped steel to substitute welded H section steel and can reduce welding sequence, improved job schedule, material use efficiency and security.
Chinese invention patent: patent No. 200410020627.X, controls method of cooling after H shape steel rolling.Although adopt the aerosol type of cooling to carry out cooling in refrigerating unit to the H shaped steel after rolling in production process, utilize phase transformation strengthening, precipitation strength and refined crystalline strengthening mechanism, obtain having the H shaped steel structural state of small grains, but be mainly the intensity that improves H shaped steel, Z-direction performance and low-temperature flexibility aspect are not related to.
Chinese invention patent: open (bulletin) number CN102051525A, a kind of production method of steel plate used for Q 420 qE bridge at low cost.This patent is mainly to take continuously cast bloom as basis, by rational controlled rolling and Controlled cooling process, processes, and produces the thick Q420qE steel plate of 10-40mm.But the object of this patent is the steel plate that continuous casting steel billet is produced, in technique, there is larger difference with the H shaped steel of producing with Hot Metal in Beam Blank.
Summary of the invention
The object of the present invention is to provide a kind of H shaped steel production technology for bridge that can meet E level steel and Z15 performance requriements in GB/T714 is provided, make H shaped steel under-40 ℃ and following low temperature environment, there is good low-temperature impact resistance and good anti-lamellar tearing performance.Concrete technical scheme is as follows:
A H shaped steel, contains according to weight percent: carbon 0.08～0.18%, silicon 0.15～0.35%, manganese 1.00～1.45%, phosphorus≤0.020%, sulphur≤0.010%, vanadium 0.020～0.080%, niobium 0.010～0.060%, nickel 0.10～0.25%, Als >=0.015%.
Further, contain other alloying elements of trace.
Further, surplus is Fe and inevitable impurity.
Further, specification is 300 * 200H shaped steel, and its-40 ℃ of low-temperature flexibilities surpass 150J, and Z15 is greater than 27.5% to relative reduction in area mean value.
The purposes of above-mentioned H shaped steel, for bridge.
The production method of above-mentioned H shaped steel, comprises the steps:
(1) hot metal pretreatment;
(2) converter smelting;
(3) Argon station;
(4) LF refining;
(5) Hot Metal in Beam Blank full guard casting;
(6) H shaped steel A line rolling.
Further, billet heating temperature is controlled at 1220～1240 ℃.
Further, rolling temperature technology controlling and process: start rolling temperature is controlled at 1050～1150 ℃, 3 frame universal rolling passage start rolling temperatures and is controlled at 910～950 ℃ of finishing temperatures and is controlled at 780～900 ℃.
Further, process for cooling is controlled: rolled piece is cooled to 550～650 ℃ of interval phase transformations with 60 ℃/s～100 ℃/s speed, rises again to 700～750 ℃, then naturally cools to room temperature.
Further, the draft of omnipotent passage is controlled at more than 50%.
Compare with currently available technology, 300 * 200 specification H shaped steel that the production method of of the present invention-40 ℃ low-temperature flexibility and Z-direction performance H shaped steel is produced, its-40 ℃ of low-temperature flexibilities surpass 150J, Z15 is greater than 27.5% to relative reduction in area mean value, there is extremely low ductile-brittle transition temperature and stronger anti-lamellar tearing performance, improved quality product.
Embodiment
Describe the present invention below, it is a kind of preferred embodiment in numerous embodiments of the present invention.
Adopt hot metal pretreatment → converter smelting → Argon station → LF refining → Hot Metal in Beam Blank full guard casting → H shaped steel A line rolling technology flow process.The chemical composition of steel: carbon is controlled at 0.08～0.18%, silicon is controlled at 0.15～0.35%, manganese is controlled at 1.00～1.45%, phosphorus is controlled at≤and 0.020%, sulphur is controlled at≤0.010%, content of vanadium is controlled at 0.020～0.080%, content of niobium is controlled at 0.010～0.060%, nickel is controlled at 0.10～0.25%, Als is controlled at >=0.015%, other alloying element trace; Heating steel billet technology controlling and process: heating and temperature control is at 1220～1240 ℃; Rolling temperature technology controlling and process: start rolling temperature is controlled at 1050～1150 ℃, 3 frame universal rolling passage start rolling temperatures and is controlled at 910～950 ℃ of finishing temperatures and is controlled at 780～900 ℃; Process for cooling is controlled: rolled piece is cooled to 550～650 ℃ of interval phase transformations with 60 ℃/s～100 ℃/s speed, rises again to 700～750 ℃, then naturally cools to room temperature; The draft of omnipotent passage is controlled at more than 50%.
Preferred embodiment example 1: hot rolled H-shaped by 300 * 200 * 12 * 12 specifications of explained hereafter of the present invention, tensile strength 520MPa, yield strength 375MPa, unit elongation 27.0% ,-40 ℃ of longitudinal V-type ballistic work 218J, heat analysis S content is 0.07%, carbon equivalent is 0.345%, Z-direction stretching relative reduction in area is 24%, 22.5% and 18.5%, and properties meets the requirement of Q345qE and Z15 in GB/T1714-2008.
Preferred embodiment example 2: hot rolled H-shaped by 300 * 200 * 12 * 12 specifications of explained hereafter of the present invention, tensile strength 575MPa, yield strength 455MPa, unit elongation 25.5% ,-40 ℃ of longitudinal V-type ballistic work 168J, heat analysis S content is 0.06%, carbon equivalent is 0.364%, Z-direction stretching relative reduction in area is 21%, 17.5% and 20.5%, and properties meets the requirement of Q420qE and Z15 in GB/T1714-2008.
Above the present invention is exemplarily described; obviously specific implementation of the present invention is not subject to the restrictions described above; as long as the various improvement that adopted method of the present invention design and technical scheme to carry out, or directly apply to other occasion without improvement, all within protection scope of the present invention.
Claims (10)
1. a H shaped steel, it is characterized in that, according to weight percent, contain: carbon 0.08～0.18%, silicon 0.15～0.35%, manganese 1.00～1.45%, phosphorus≤0.020%, sulphur≤0.010%, vanadium 0.020～0.080%, niobium 0.010～0.060%, nickel 0.10～0.25%, Als >=0.015%.
2. H shaped steel as claimed in claim 1, is characterized in that, contains other alloying elements of trace.
3. H shaped steel as claimed in claim 1 or 2, is characterized in that, surplus is Fe and inevitable impurity.
4. the H shaped steel as described in any one in claim 1-3, is characterized in that, specification is 300 * 200H shaped steel, and its-40 ℃ of low-temperature flexibilities surpass 150J, and Z15 is greater than 27.5% to relative reduction in area mean value.
5. the purposes of the H shaped steel as described in claim 1-4, is characterized in that, has low-temperature flexibility and Z-direction performance, for bridge.
6. the production method of the H shaped steel as described in claim 1-4, is characterized in that, comprises the steps:
(1) hot metal pretreatment;
(2) converter smelting;
(3) Argon station;
(4) LF refining;
(5) Hot Metal in Beam Blank full guard casting;
(6) H shaped steel A line rolling.
7. the production method of H shaped steel as claimed in claim 6, is characterized in that, billet heating temperature is controlled at 1220～1240 ℃.
8. the production method of the H shaped steel as described in claim 6 or 7, it is characterized in that rolling temperature technology controlling and process: start rolling temperature is controlled at 1050～1150 ℃, 3 frame universal rolling passage start rolling temperatures and is controlled at 910～950 ℃ of finishing temperatures and is controlled at 780～900 ℃.
9. the production method of the H shaped steel as described in any one in claim 6-8, is characterized in that, process for cooling is controlled: rolled piece is cooled to 550～650 ℃ of interval phase transformations with 60 ℃/s～100 ℃/s speed, rises again to 700～750 ℃, then naturally cools to room temperature.
10. the production method of the H shaped steel as described in any one in claim 6-9, is characterized in that, the draft of omnipotent passage is controlled at more than 50%.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104831154A (en) * | 2015-06-03 | 2015-08-12 | 马钢(集团)控股有限公司 | H-beam and production method thereof |
| CN104831164A (en) * | 2015-06-03 | 2015-08-12 | 马钢(集团)控股有限公司 | H-shaped steel and production method thereof |
| CN107227430A (en) * | 2017-06-24 | 2017-10-03 | 马鞍山钢铁股份有限公司 | A kind of hot rolled H-shaped and its production method with 60 DEG C of good low-temperature toughness |
| CN108754327A (en) * | 2018-06-15 | 2018-11-06 | 马鞍山钢铁股份有限公司 | A kind of yield strength 460MPa grades of bridge structure high tenacity are weather-resistance hot rolled H-shaped and its production method |
| CN110358973A (en) * | 2019-07-25 | 2019-10-22 | 南京钢铁股份有限公司 | A kind of low cost S 420NL low-temperature flexibility steel plate and manufacturing method |
| CN111996445A (en) * | 2020-07-29 | 2020-11-27 | 河北津西钢铁集团股份有限公司 | Low-carbon hot-rolled H-shaped steel and preparation method thereof |
| CN113550433A (en) * | 2021-07-29 | 2021-10-26 | 马鞍山钢铁股份有限公司 | Hot-rolled X-shaped steel and hot-rolling forming process thereof |
| CN115369328A (en) * | 2022-09-22 | 2022-11-22 | 马鞍山钢铁股份有限公司 | Low-temperature-resistant hot-rolled section steel and production method thereof |
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| JP2002256382A (en) * | 2000-12-27 | 2002-09-11 | Nkk Corp | Wear resistant steel sheet and production method therefor |
| CN102206788A (en) * | 2011-05-13 | 2011-10-05 | 莱芜钢铁集团有限公司 | Steel and production method thereof |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104831154A (en) * | 2015-06-03 | 2015-08-12 | 马钢(集团)控股有限公司 | H-beam and production method thereof |
| CN104831164A (en) * | 2015-06-03 | 2015-08-12 | 马钢(集团)控股有限公司 | H-shaped steel and production method thereof |
| CN107227430A (en) * | 2017-06-24 | 2017-10-03 | 马鞍山钢铁股份有限公司 | A kind of hot rolled H-shaped and its production method with 60 DEG C of good low-temperature toughness |
| CN108754327A (en) * | 2018-06-15 | 2018-11-06 | 马鞍山钢铁股份有限公司 | A kind of yield strength 460MPa grades of bridge structure high tenacity are weather-resistance hot rolled H-shaped and its production method |
| CN110358973A (en) * | 2019-07-25 | 2019-10-22 | 南京钢铁股份有限公司 | A kind of low cost S 420NL low-temperature flexibility steel plate and manufacturing method |
| CN111996445A (en) * | 2020-07-29 | 2020-11-27 | 河北津西钢铁集团股份有限公司 | Low-carbon hot-rolled H-shaped steel and preparation method thereof |
| CN111996445B (en) * | 2020-07-29 | 2021-09-07 | 河北津西钢铁集团股份有限公司 | Low-carbon hot-rolled H-shaped steel and preparation method thereof |
| CN113550433A (en) * | 2021-07-29 | 2021-10-26 | 马鞍山钢铁股份有限公司 | Hot-rolled X-shaped steel and hot-rolling forming process thereof |
| CN113550433B (en) * | 2021-07-29 | 2023-08-29 | 马鞍山钢铁股份有限公司 | Hot-rolled X-shaped steel and hot-rolling forming process thereof |
| CN115369328A (en) * | 2022-09-22 | 2022-11-22 | 马鞍山钢铁股份有限公司 | Low-temperature-resistant hot-rolled section steel and production method thereof |
| CN115369328B (en) * | 2022-09-22 | 2024-01-23 | 马鞍山钢铁股份有限公司 | Low-temperature-resistant rolled steel and production method thereof |
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Application publication date: 20141001 |