CN107058863A - A kind of 550MPa grades inexpensive steel plate for ocean engineering and its manufacture method - Google Patents
A kind of 550MPa grades inexpensive steel plate for ocean engineering and its manufacture method Download PDFInfo
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- CN107058863A CN107058863A CN201611250031.8A CN201611250031A CN107058863A CN 107058863 A CN107058863 A CN 107058863A CN 201611250031 A CN201611250031 A CN 201611250031A CN 107058863 A CN107058863 A CN 107058863A
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- steel plate
- ocean engineering
- temperature
- 550mpa
- 550mpa grades
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Classifications
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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
- C22C38/02—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
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
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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
-
- 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
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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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
- C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
-
- 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
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
-
- 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
-
- 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
- C22C38/16—Ferrous alloys, e.g. steel alloys containing copper
-
- 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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
The invention belongs to ship and ocean engineering structural steel technical field, more particularly to a kind of 550MPa grades low steel plate for ocean engineering and its manufacture method, it includes thickness specification for [20,80] mm.The steel plate chemical composition mass percent of steel is：C：0.12~0.16%, Si：0.15~0.30%, Mn：1.30~1.60%, P：≤ 0.015%, S：≤ 0.005%, Als：0.020~0.055%, Nb：0.020~0.040%, V：0.030~0.050%, Ti：0.015~0.025%, Ni：0.20~0.40%, Mo：0.10~0.25%, Cu：0.05~0.20%, Cr：0.20 0.40%, surplus is Fe and inevitable impurity.Steel plate reasonable composition produced by the invention, by effectively reducing Mo, Ni addition, has produced the high-grade extra large work steel plate of low cost.
Description
Technical field
The invention belongs to ship and ocean engineering structural steel technical field, it is more particularly to a kind of it is 550MPa grades low into
This steel plate for ocean engineering.
Background technology
Marine oil and gas resource is that the oceanic mineral resources of representative is the emphasis and focus of our times marine resources development.Sea
Foreign platform is the ultra-large type welded steel structure for developing marine resources, and application environment is severe, intensity to Marine Engineering Steel, tough
The performances such as property, welding propose high requirement.
Domestic Marine Engineering Steel is main based on below EH36 ranks, i.e., strength grade is surrender 355Mpa, can be met
The minimum temperature of toughness reguirements is -40 DEG C.Marine engineering equipment develops to maximization, lightweight, and the steel plate of this rank is more next
More it is difficult to the need for meeting marine engineering equipment development.The technique that high-grade offshore platform steel plate typically uses low C high alloys
Route, it is costly.
The content of the invention
The invention provides a kind of 550MPa grades inexpensive steel plate for ocean engineering, by using microalloys such as Nb, V, Ti
Composition, suitably increases C content, reduces the content of the noble metals such as Ni, Mo, by subsequent heat treatment process adjustments performance, effectively drop
Low cost.550MPa grades of offshore platform steel plates of the technique productions, cost is relatively low, and mechanical property is uniform, and welding performance is good.
In order to meet performance requirements, production cost is reduced, carbon component is designed in, addition Nb, V, Ti are combined
The composition design of microalloying.Steel plate tissue, the precipitation strength produced using V are refined by Nb delayed deformations austenite recrystallization
Effect, improves armor plate strength, toughness and plasticity, so that good combination property is obtained, and the strong carbon of fixed C, N interstitial atom,
Nitride forming element.By being properly added the strong quenching degree element such as C, Mo, Cr, improve tissue, improve intensity；Improved by Ni
Toughness, and by subsequent heat treatment technology controlling and process steel plate tissue, obtain the plate property of excellent combination property.
The present invention is achieved by the following technical solutions：A kind of 550MPa grades of steel plate for ocean engineering, it includes thickness
Specification is [20,80] mm thickness specifications, and the steel plate chemical composition mass percent is：C：0.12~0.16%, Si：0.15~
0.30%, Mn：1.30~1.60%, P：≤ 0.015%, S：≤ 0.005%, Als：0.020~0.055%, Nb：0.020~
0.040%, V：0.030~0.050%, Ti：0.015~0.025%, Ni：0.20~0.40%, Mo：0.10~0.25%,
Cu：0.05~0.20%, Cr：0.20-0.40%, surplus is Fe and inevitable impurity.
The present invention is using a kind of 550MPa grades inexpensive steel plate for ocean engineering of hardening and tempering process production, the thickness range of steel plate
For 20-80mm.
The present invention production offshore platform steel production method be：Blast-melted → molten iron pre-desulfurization → converter smelting → de-
Oxygen alloy → LF refining → RH refinings → offline the stacking slow cooling of sheet billet continuous casting → slab → slab cleaning → slab reheating →
4300 mill millings → Mulpic section coolings → steel plate stacking slow cooling → quenching → tempering → finished product inspection by sampling → storage.
Its process conditions is：
(1) smelting process：Desulfurizing iron≤0.003%；Strand P≤0.010%, RH degassings terminate rear soft blow not less than 20
Minute, 1532-1540 DEG C of bag target temperature in Calcium treatment, continuous casting is carried out after application of vacuum, be liquidus temperature plus 15~25 DEG C,
Pulling rate is stable；Strand examination requirements：Center segregation C class≤1.5, center porosity≤0.5, [N]≤30ppm, [O]≤25ppm,
[H]≤1.5ppm, 250mm heavy slabs, offline stacking slow cooling are cast into by molten steel.
(2) pouring technology：Pouring temperature is in 1540 ± 5 DEG C, slab thickness 300mm, more than 700 DEG C progress after being poured
Slow cooling, temperature retention time is not less than 72 hours.
(3) heating technique：Heating and temperature control is in 1100 DEG C ± 10 DEG C, heat time 10min/mm.
(4) rolling mill practice：Take cooling controlling and rolling controlling process, 980 DEG C of roughing start rolling temperature, single pass reduction ratio is not less than
20%；800 DEG C of finish rolling finishing temperature, in addition to final pass, reduction ratio is not less than 16%.Roller repairing, open cold 770 DEG C of temperature ±
10 DEG C, 4-8 DEG C of cooling rate/S, 450 DEG C -550 DEG C of final cooling temperature.
(5) modifier treatment：910 DEG C of hardening heat, soaking time 1.5min/mm, 610-660 DEG C of temperature, during insulation
Between 2-3min/mm.
The present invention, through above method integrated treatment, can effectively reduce noble metal by increasing low cost C, B alloy
The addition of Mo, Ni alloy, in the case where properties of product meet standard requirement, ton steel reduces alloy 200-400 members, economy effect
Fruit is substantially.
Embodiment
Chemical composition, technological process and the defined process conditions provided according to the present invention, smelt in 210 tons of converters
Molten steel, 300mm heavy slabs are cast into by molten steel, roll 20mm, 80mm steel plate respectively on 4300mm wide and heavy plate mills.
The chemical composition of steel plate is shown in Table 1；Heating, rolling, cooling technique parameter are shown in Table 2；The behavior pattern of steel plate is shown in Table 3；
Test piece for welding result of the test is shown in Table 4.
The steel plate upper yield strength 570-620MPa of the present invention, tensile strength 680-760MPa, elongation after fracture 19~
22%, -20 DEG C of Charpy impact energies are longitudinally average in more than 135J, and Z-direction Tensile fracture shrinkage factor is average more than 45%.
The chemical composition (Wt, %) of the steel plate of table 1
Table 2 is heated, rolled, cooling technique parameter
The behavior pattern of the steel plate of table 3
Claims (8)
1. a kind of 550MPa grades inexpensive steel plate for ocean engineering, it is characterised in that：The steel plate include thickness specification for [20,
80] mm, steel plate chemical composition mass percent is：C：0.12~0.16%, Si：0.15~0.30%, Mn：1.30~
1.60%, P：≤ 0.015%, S：≤ 0.005%, Als：0.020~0.055%, Nb：0.020~0.040%, V：0.030~
0.050%, Ti：0.015~0.025%, Ni：0.20~0.40%, Mo：0.10~0.25%, Cu：0.05~0.20%, Cr：
0.20-0.40%, surplus is Fe and inevitable impurity.
2. a kind of 550MPa grades inexpensive steel plate for ocean engineering as claimed in claim 1, it is characterised in that：Using above-mentioned side
The thick sea work steel of 550MPa levels 80mm of method production, yield strength can reach yield strength 580MPa, tensile strength 7690MPa with
On, Charpy-V impact power can reach 163J at -40 DEG C, in more than 100J at -60 DEG C.
3. a kind of production method of 550MPa grades of steel plate for ocean engineering according to claim 1, it is characterised in that：Specifically
Step is：Smelting process, pouring technology, heating technique, rolling mill practice, modifier treatment.
4. a kind of production method of 550MPa grades of steel plate for ocean engineering as claimed in claim 3, it is characterised in that：Described
Smelting process is：It is C by mass percentage content：0.12~0.16%, Si：0.15~0.30%, Mn：1.30~1.60%,
P：≤ 0.015%, S：≤ 0.005%, Als：0.020~0.055%, Nb：0.020~0.040%, V：0.030~
0.050%, Ti：0.015~0.025%, Ni：0.20~0.40%, Mo：0.10~0.25%, Cu：0.05~0.20%, Cr：
The molten steel of 0.20-0.40% compositions carries out LF refining furnace refining and RH refines degassing, RH degassing times are not small after converter smelting
In 6min, the soft blow time is not less than 20min.
5. a kind of production method of 550MPa grades of steel plate for ocean engineering as claimed in claim 3, it is characterised in that：Described
Pouring technology：Pouring temperature is at 1540 ± 5 DEG C, and slab thickness 300mm is poured latter more than 700 DEG C and carries out slow cooling, during slow cooling
Between be not less than 72 hours.
6. a kind of production method of 550MPa grades of steel plate for ocean engineering as claimed in claim 3, it is characterised in that：Described
Heating technique：Heating and temperature control is in 1100 DEG C ± 10 DEG C, heat time 10min/mm.
7. a kind of production method of 550MPa grades of steel plate for ocean engineering as claimed in claim 3, it is characterised in that：Described
Rolling mill practice：Cooling controlling and rolling controlling process is taken, 980 DEG C of roughing start rolling temperature, single pass reduction ratio is not less than 20%；Finish rolling finish to gauge temperature
800 DEG C of degree, in addition to final pass, reduction ratio is not less than 16%.Roller repairing, opens cold 770 DEG C ± 10 DEG C of temperature, and 4-8 DEG C of cooling rate/
S, 450 DEG C -550 DEG C of final cooling temperature.
8. a kind of production method of 550MPa grades of steel plate for ocean engineering as claimed in claim 3, it is characterised in that：Described
Modifier treatment：910 DEG C of hardening heat, soaking time 1.5min/mm, 610-660 DEG C of temperature, soaking time 2-3min/mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611250031.8A CN107058863A (en) | 2016-12-29 | 2016-12-29 | A kind of 550MPa grades inexpensive steel plate for ocean engineering and its manufacture method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611250031.8A CN107058863A (en) | 2016-12-29 | 2016-12-29 | A kind of 550MPa grades inexpensive steel plate for ocean engineering and its manufacture method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107058863A true CN107058863A (en) | 2017-08-18 |
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ID=59623930
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611250031.8A Pending CN107058863A (en) | 2016-12-29 | 2016-12-29 | A kind of 550MPa grades inexpensive steel plate for ocean engineering and its manufacture method |
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| Country | Link |
|---|---|
| CN (1) | CN107058863A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107746919A (en) * | 2017-11-12 | 2018-03-02 | 湖南华菱湘潭钢铁有限公司 | The production method of Thin Specs high straightness Q550E/F quenched and tempered steel |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1215624A (en) * | 1997-10-24 | 1999-05-05 | 化学工业部西南化工研究设计院 | Multi-bed vacuum pressure swing adsorption process for extracting hydrogen from hydrogen-contg. mixed gas |
| CN102337460A (en) * | 2011-11-14 | 2012-02-01 | 首钢总公司 | Ultrahigh-strength structural steel board for ocean engineering and production method thereof |
| CN103045964A (en) * | 2013-01-05 | 2013-04-17 | 莱芜钢铁集团有限公司 | Steel plate and manufacturing method thereof |
| CN104278206A (en) * | 2014-10-15 | 2015-01-14 | 山东钢铁股份有限公司 | Steel plate with thickness of smaller than 60mm and yield strength of 690MPa and preparation method of steel plate |
-
2016
- 2016-12-29 CN CN201611250031.8A patent/CN107058863A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1215624A (en) * | 1997-10-24 | 1999-05-05 | 化学工业部西南化工研究设计院 | Multi-bed vacuum pressure swing adsorption process for extracting hydrogen from hydrogen-contg. mixed gas |
| CN102337460A (en) * | 2011-11-14 | 2012-02-01 | 首钢总公司 | Ultrahigh-strength structural steel board for ocean engineering and production method thereof |
| CN103045964A (en) * | 2013-01-05 | 2013-04-17 | 莱芜钢铁集团有限公司 | Steel plate and manufacturing method thereof |
| CN104278206A (en) * | 2014-10-15 | 2015-01-14 | 山东钢铁股份有限公司 | Steel plate with thickness of smaller than 60mm and yield strength of 690MPa and preparation method of steel plate |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107746919A (en) * | 2017-11-12 | 2018-03-02 | 湖南华菱湘潭钢铁有限公司 | The production method of Thin Specs high straightness Q550E/F quenched and tempered steel |
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Application publication date: 20170818 |
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| RJ01 | Rejection of invention patent application after publication |