CN106216947A - A kind of production method of big thickness flaw detection steel plate - Google Patents
A kind of production method of big thickness flaw detection steel plate Download PDFInfo
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- CN106216947A CN106216947A CN201610593118.9A CN201610593118A CN106216947A CN 106216947 A CN106216947 A CN 106216947A CN 201610593118 A CN201610593118 A CN 201610593118A CN 106216947 A CN106216947 A CN 106216947A
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- steel plate
- flaw detection
- steel
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- billet
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
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- Metal Rolling (AREA)
Abstract
The invention discloses the production method of a kind of big thickness flaw detection steel plate, 3 blocks of steel billets are connected into thick stock by Combined Welding by it, then thick stock carries out hot rolling, i.e. available described flaw detection steel plate；Described course of hot rolling has 4 passages and above reduction ratio 12% and more than, the first passage roll reduction 40mm and more than.This method uses composite means system big thickness steel billet technique, and through hot rolling, it is thus achieved that good Z-direction performance, inherent quality is excellent, dense structure's degree is high, can be widely applied to building, water power base, engineering rack and other industry, has good application prospect.This method uses the low-alloy super-thick steel plate that composite billet produces, and has that lumber recovery is high, a low cost and be effectively improved the defect such as loose, segregation at steel plate center, improves steel plate inspection rank；Billet size can need to be adjusted flexibly according to order, is suitable for multi items, many specifications, small lot, big substance and the high-quality market demand.
Description
Technical field
The present invention relates to the production method of a kind of flaw detection steel plate, the life of the big thickness flaw detection steel plate of a kind of GB I grade
Product method.
Background technology
Along with the development of the development of the national economy, user's mechanical property to steel plate, interior external quality proposes more and more higher
Requirement.This just requires that the P of steel, S, gas (N, H, O), inclusion content are relatively low, and namely the pure property of steel is good, consistency
High.Flaw detection then macroscopic view can reflect the degree of purity of steel, consistency and uniformity.Require the steel plate of flaw detection delivery,
It is generally used for manufacturing boilers and pressure vessel, the industry such as power plant project, boats and ships, bridge, military project, petrochemical industry, skyscraper
Important feature part.
Along with the development of every profession and trade, increasing to the demand of big thickness steel plate flaw detection plate, flaw detection steel belongs to high additional
Value steel, with high content of technology, development difficulty is big, and finished product is difficult to reach high-level flaw detection requirement；More than 180mm steel plate inspection slab is general
All over using steel ingot, electroslag base to produce, production cost can be in any more, and steel plate thickness is limited, it is difficult to meet market big thickness steel
The demand of plate flaw detection plate.
Summary of the invention
The technical problem to be solved in the present invention is to provide the production method of the big thickness flaw detection steel plate of a kind of low cost.
For solving above-mentioned technical problem, the technical solution used in the present invention is: 3 blocks of steel billets are connected into by it by Combined Welding
Thick stock, then thick stock is carried out hot rolling, i.e. available described flaw detection steel plate；Described course of hot rolling has 4 passages and above pressure
Lower rate 12% and more than, the first passage roll reduction 40mm and more than.
The section thickness of steel billet of the present invention is 330mm, and steel plate thickness is 350mm～400mm.
Abutment joint≤the 2mm of steel billet before composite welding of the present invention, billet surface roughness≤5um after composite welding.
The welding current of composite welding of the present invention is 15～20mA, and voltage is 600～650kV, and speed of welding is 300
～350mm/s.
The steel grade of steel billet of the present invention is low alloy steel plate, straight carbon steel or low-alloy high-strength steel.
The present invention uses composite means system big thickness steel billet technique, and owing to composite blank is 3 nugget genus, multiple layer metal is complete
After becoming physical contact to realize preliminary combination, the atom in each constituent element metal passes through faying face phase counterdiffusion, to promote bond strength；
Therefore the present invention improves drafts to strengthen composite plate binding ability.The present invention is in actual production, by hot rolling technology, blank
Can preferably improve reduction ratio or drafts, be conducive to improving composite plate binding ability, and improve drafts and can improve
Steel plate internal defect defect, reduces size or the area of rarefaction defect, is conducive to improving flaw detection grade.
Use and have the beneficial effects that produced by technique scheme: the present invention uses composite means system big thickness steel billet work
Skill, through hot rolling, it is thus achieved that good Z-direction performance, and inherent quality is excellent, dense structure's degree is high, can be widely applied to building, water power
Base, engineering rack and other industry, have good application prospect.
The present invention uses the low-alloy super-thick steel plate that composite billet produces, and has lumber recovery height, low cost and is effectively improved
The defects such as loose, the segregation at steel plate center, improve steel plate inspection rank；Billet size can need to be adjusted flexibly, more according to order
Adapt to multi items, many specifications, small lot, big substance and the high-quality market demand.
The mechanical property of gained steel plate the most of the present invention, reaches following requirements: steel plate (Z-direction at thickness 1/4 and 1/2
Performance) meet Z35 requirement；Steel plate inspection rank all meets GB I grade standard, and the highest non-destructive testing standard is (such as moral mark
Sel072-99 I level), part may conform to forging flaw detection requirement；Thickness is maximum up to 400mm, meets ultra-thick steel plate inspection
Plate requirement.
Detailed description of the invention
Below in conjunction with specific embodiment, the present invention is further detailed explanation.
Embodiment 1: the production method of this big thickness flaw detection steel plate uses following processing step.
(1) combination process: the S355J2 steel billet that 3 pieces of section thicknesses are 330mm is made 960mm thickness by combination process
Thick stock；Steel billet is processed, make the surface roughness of steel billet be the abutment joint between 5um, steel billet be 2mm, then carry out multiple
Close welding (vacuum welding)；Welding current is 15mA, and voltage is 600kV, and speed of welding is 300mm/s.
(2) rolling mill practice: use hot rolling technology；The reduction ratio of 6 passages is had more than 12%, respectively during steel plate rolling
It is 16%, 15%, 15%, 17%, 13%, 16%, the first passage roll reduction 50mm；Rolling obtains the flaw detection steel that thickness is 350mm
Plate.
The inherent quality index of gained flaw detection steel plate: steel plate inspection result closes GB/T2970-2004 I level；Z at thickness 1/4
To performance: 46,48,45；Z-direction performance at thickness 1/2: 51,50,48；Meet Z35 requirement.
Embodiment 2: the production method of this big thickness flaw detection steel plate uses following processing step.
(1) combination process: the Q345E steel billet that 3 pieces of section thicknesses are 330mm is made 960mm thickness by combination process
Thick stock；Before composite welding, the surface roughness of steel billet be the abutment joint between 4um, steel billet be 1mm,；Welding current is
17mA, voltage is 620kV, and speed of welding is 320mm/s.
(2) rolling mill practice: use hot rolling technology；Have during steel plate rolling the reduction ratio of 6 passages 12% and more than, point
It is not 14%, 16%, 15%, 13%, 12%, 15%；First passage roll reduction 60mm；Rolling obtains the flaw detection that thickness is 365mm
Steel plate.
The inherent quality index of gained flaw detection steel plate: steel plate inspection meets GB/T2970-2004 I level；Z-direction at thickness 1/4
Performance: 50,50,51；Z-direction performance at thickness 1/2: 42,45,51；Meet Z35 requirement.
Embodiment 3: the production method of this big thickness flaw detection steel plate uses following processing step.
(1) combination process: the S355J0 steel billet that 3 pieces of section thicknesses are 330mm is made 960mm thickness by combination process
Thick stock；Before composite welding, the surface roughness of steel billet be the abutment joint between 3um, steel billet be 0.5mm；Welding current is
18mA, voltage is 650kV, and speed of welding is 350mm/s.
(2) rolling mill practice: use hot rolling technology；Have during steel plate rolling the reduction ratio of 4 passages 12% and more than, point
It is not 16%, 15%, 12%, 14%；First passage roll reduction 65mm；Rolling obtains the flaw detection steel plate that thickness is 377mm.
The inherent quality index of gained flaw detection steel plate: steel plate inspection closes Sel072-99 I level；Meet GB/T2970-2004
I level；Z-direction performance at thickness 1/4: 47,48,47；Z-direction performance at thickness 1/2: 50,51,53；Meet Z35 requirement.
Embodiment 4: the production method of this big thickness flaw detection steel plate uses following processing step.
(1) combination process: the AS3678-350 steel billet that 3 pieces of section thicknesses are 330mm is made 960mm by combination process
The thick stock of thickness；Before composite welding, the surface roughness of steel billet is 2um, and the abutment joint between steel billet is 0.5mm；Welding current
For 19mA, voltage is 620kV, and speed of welding is 350mm/s.
(2) rolling mill practice: use hot rolling technology；Have during steel plate rolling the reduction ratio of 6 passages 12% and more than, point
It is not 13%, 12%, 15%, 13%, 14%, 12%；First passage roll reduction 65mm；Rolling obtains the flaw detection that thickness is 395mm
Steel plate.
The inherent quality index of gained flaw detection steel plate: steel plate inspection meets GB/T2970-2004 I level；Z-direction at thickness 1/4
Performance: 45,40,47；Z-direction performance at thickness 1/2: 52,46,51；Meet Z35 requirement.
Embodiment 5: the production method of this big thickness flaw detection steel plate uses following processing step.
(1) combination process: the Q345B/Z25 steel billet that 3 pieces of section thicknesses are 330mm is made 960mm by combination process
The thick stock of thickness；Before composite welding, the surface roughness of steel billet is 3um, and the abutment joint between steel billet is 0.5mm；Welding current
For 20mA, voltage is 630kV, and speed of welding is 330mm/s.
(2) rolling mill practice: use hot rolling technology；Have during steel plate rolling the reduction ratio of 5 passages 12% and more than, point
It is not 15%, 16%, 13%, 12%, 13%；First passage roll reduction 40mm；Rolling obtains the flaw detection steel plate that thickness is 400mm.
The inherent quality index of gained flaw detection steel plate: steel plate inspection meets GB/T2970-2004 I level；Z-direction at thickness 1/4
Performance: 45,50,51；Z-direction performance at thickness 1/2: 47,52,51；Meet Z35 requirement.
Claims (5)
1. the production method of a big thickness flaw detection steel plate, it is characterised in that: 3 blocks of steel billets are connected into thick stock by Combined Welding by it,
Thick stock is carried out hot rolling, i.e. available described flaw detection steel plate again；Described course of hot rolling there are 4 passages and above reduction ratio exist
12% and more than, the first passage roll reduction 40mm and more than.
The production method of a kind of big thickness flaw detection steel plate the most according to claim 1, it is characterised in that: breaking of described steel billet
Face thickness is 330mm, and steel plate thickness is 350mm～400mm.
The production method of a kind of big thickness flaw detection steel plate the most according to claim 1, it is characterised in that: described composite welding
Front billet surface roughness≤5um, the abutment joint≤2mm of steel billet.
The production method of a kind of big thickness flaw detection steel plate the most according to claim 1, it is characterised in that: described composite welding
Welding current be 15～20mA, voltage is 600～650kV, and speed of welding is 300～350mm/s.
5. according to the production method of a kind of big thickness flaw detection steel plate described in claim 1-4 any one, it is characterised in that:
The steel grade of described steel billet is low alloy steel plate, straight carbon steel or low-alloy high-strength steel.
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| CN201610593118.9A CN106216947A (en) | 2016-07-26 | 2016-07-26 | A kind of production method of big thickness flaw detection steel plate |
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| CN201610593118.9A CN106216947A (en) | 2016-07-26 | 2016-07-26 | A kind of production method of big thickness flaw detection steel plate |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107175259A (en) * | 2017-04-20 | 2017-09-19 | 舞阳钢铁有限责任公司 | A kind of production method of big thickness national standard flaw detection steel plate |
| CN107326164A (en) * | 2017-05-23 | 2017-11-07 | 舞阳钢铁有限责任公司 | A kind of production method of big thickness 690MPa high strength steel plates |
| CN111530961A (en) * | 2020-05-09 | 2020-08-14 | 江苏远航精密合金科技股份有限公司 | Method for preparing ultra-high-purity nickel strip in short process |
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|---|---|---|---|---|
| CN107175259A (en) * | 2017-04-20 | 2017-09-19 | 舞阳钢铁有限责任公司 | A kind of production method of big thickness national standard flaw detection steel plate |
| CN107326164A (en) * | 2017-05-23 | 2017-11-07 | 舞阳钢铁有限责任公司 | A kind of production method of big thickness 690MPa high strength steel plates |
| CN111530961A (en) * | 2020-05-09 | 2020-08-14 | 江苏远航精密合金科技股份有限公司 | Method for preparing ultra-high-purity nickel strip in short process |
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Application publication date: 20161214 |