CN102605245A - Ni-free normalized type Q370R pressure vessel steel plate and manufacturing method thereof - Google Patents
Ni-free normalized type Q370R pressure vessel steel plate and manufacturing method thereof Download PDFInfo
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- CN102605245A CN102605245A CN2011104620828A CN201110462082A CN102605245A CN 102605245 A CN102605245 A CN 102605245A CN 2011104620828 A CN2011104620828 A CN 2011104620828A CN 201110462082 A CN201110462082 A CN 201110462082A CN 102605245 A CN102605245 A CN 102605245A
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Abstract
The invention relates to a Ni-free normalized type Q370R pressure vessel steel plate and a manufacturing method of the Ni-free normalized type Q370R pressure vessel steel plate. The steel plate comprises the following chemical components in percentage by weight: 0.15-0.18% of C,0.25-0.50% of Si, 1.4-1.6% of Mn, less than or equal to 0.015% of P, less than or equal to 0.005% of S, 0.02-0.03% of Nb, 0.07-0.08% of V, 0.006-0.010% of Ti, 0.024-0.034% of Als, and the balance of Fe and inevitable impurities. The manufacturing method comprises the following steps of: taking molten iron and waste steel subjected to desulfuration pretreatment as raw materials, and then performing the processes of smelting, continuous casting, heating, rolling and cooling, normalizing thermal treating, and the like, thereby obtaining the Ni-free normalized type Q370R pressure vessel steel plate. The Ni-free normalized type Q370R pressure vessel steel plate has the advantages of above 370MPa yield strength, excellent plasticity, low-temperature impact toughness, high-temperature tensile property, excellent Z directional tensile property, and wide application in the field of storing liquefied petroleum gas, liquefied natural gas, and the like.
Description
Technical field
The present invention relates to the low-alloy pressure vessel steel of field of metallurgy, particularly a kind of no Ni normalizing type Q370R steel plate of pressure vessel and method of manufacture thereof.
Background technology
Pressurized vessel is widely used in departments such as chemical industry, oil, machinery, power, metallurgy, nuclear energy, Aeronautics and Astronautics, ocean.It is a requisite nucleus equipment in the Industrial processes, is the important symbol of country's equipment manufacture level.Steel plate of pressure vessel is one big type of special-purpose high technology content in the plate, high value added product.Be used to store, the steels for pressure vessel use of cryogenic liquid such as conveying liquified petroleum gas, natural gas liquids, not only require steel plate to have good obdurability and mechanical behavior under high temperature, also require steel plate to have good low-temperature impact toughness.
Present domestic same level steels for pressure vessel use and method of manufacture thereof are following:
Chinese patent CN101082104A discloses " a kind of nickel-free micro-alloy low-temperature pressure vessel steel and method of manufacture thereof "; Composition quality per-cent is: C 0.04～0.08, Si＜0.6, Mn 1.0～1.6, Nb 0.010～0.030, Ti 0.005～0.030, V＜0.070%, Al 0.004～0.060, N＜0.008, P＜0.015, S＜0.010, all the other are Fe and inevitable impurity.Adopt the rolling method of TMCP to make the ys of steel plate reach more than the 360MPa, tensile strength surpasses 490MPa, and low-temperature impact toughness satisfies-60 ℃ requirement (ballistic work that promptly satisfies-60 ℃ is not less than 41J), and has good plasticity and weldableness.Because of not adding noble metal Ni, Mo, and adopt the rolling replacement modifier treatment of TMCP, can reduce production costs and shorten the manufacturing cycle.Weak point is to adopt the Ultra-low carbon design, has increased smelting cost.
Chinese patent CN101871077A discloses " a kind of normalizing type high-strength pressure vessel steel and method of manufacture thereof "; Chemical component weight per-cent is: C:0.12～0.18%, Si:0.15～0.40%, Mn:1.20～1.70%, P≤0.020%, S≤0.015%, Ni:0.10～0.40%, Nb:0.01～0.05%, Ti:0.01～0.03%, Als:0.015～0.050%; Include in V≤0.20%, Cu≤0.70% one or both simultaneously, all the other are Fe and unavoidable impurities.Utilize the specification of single roll process control steel plate, through after the controlled rolling, adopt 840～920 ℃ of normalizing temperatures, the normalizing process of soaking time 30～40min+t * 1min/mm has obtained uniform ferritic and pearlitic structure.Steel plate has good intensity, plasticity, toughness and welding property.Weak point is to have added the Ni alloy, has increased cost.
Chinese patent CN101713044A discloses " a kind of Q370R steels for pressure vessel use and preparation method thereof "; Chemical component weight per-cent is: C:0.14～0.18%, Si:0.25～0.50%, Mn:1.45～1.60%; P≤0.020%; S≤0.015%, Nd:0.28～0.45%, surplus is Fe and unavoidable impurities.A kind of preparation method of Q370R steels for pressure vessel use is also disclosed simultaneously.Q370R steels for pressure vessel use of the present invention has been optimized set of dispense ratio and thermal treatment process, on the basis of tensile strength and ys conformance with standard GB713-2008; Improved low-temperature impact toughness; Greater than 200J, reach as high as 304J at-27 ℃ of ballistic works, be higher than 7.5 times of national standard lower limits; And the performance parameter variations of tensile strength, ys, extensibility and impelling strength after having carried out the simulation welding is little, has therefore improved the welding property of Q370R.
Summary of the invention
The purpose of this invention is to provide a kind of ys greater than 370MPa; Have good plasticity, low-temperature impact toughness and high temperature tensile properties and good Z to tensile property; And production cost is lower, a kind of no Ni normalizing type Q370R steel plate of pressure vessel and method of manufacture thereof that specification is controlled.This steel plate is mainly used in the manufacturing of pressure vessel and equipment in production, storage and the transportation.
Technical scheme of the present invention is following:
The chemical ingredients of steel plate of the present invention is C:0.15～0.18%, Si:0.25～0.50%, Mn:1.4～1.6%, P by weight percentage: S≤0.015% :≤0.005%, Nb:0.02～0.03%, V:0.07～0.08%, Ti:0.006～0.010%, Als:0.024～0.034%, surplus is Fe and unavoidable impurities.
Method of manufacture of the present invention, key step and processing parameter are following:
1, smelts
Adopt through the pretreated molten iron of desulfurization and high-quality steel scrap as raw material, with efficient top and bottom complex blowing, furnace gas analyze automatically and the sound attitude automatically three advanced production technologies of steel-making serve as that the smelting production of converter Clean Steel is carried out in guarantee.Handle operation and soft blow technology through optimizing calcium, further come-up is got rid of the non-metallic inclusion in the steel, obtains clean steel.The RH operation adopts the dark degasification technique of circulation; Guaranteeing significantly to reduce gas contents such as hydrogen, oxygen, nitrogen under the stable prerequisite of liquid steel temperature; Reduce the disadvantageous effect of obnoxious flavour to steel, finally obtaining chemical component weight per-cent is C:0.15～0.18%, Si:0.25～0.50%, Mn:1.4～1.6%, P: S≤0.015% :≤0.005%, Nb:0.02～0.03%, V:0.07～0.08%, Ti:0.006～0.010%, Als:0.024～0.034%, surplus are Fe and unavoidable impurities.
2, continuous casting
Continuous caster is straight curved type continuous caster, on adorn chain type dummy bar, multi-point bending continuous straightening technology, solidification end is dynamically gently depressed and dynamic two refrigeration techniques optimized, through constant temperature, permanent pulling rate technology, alleviates defectives such as continuously cast bloom center segregation and center porosity; Through tracking, improvement and the optimization of crystallizer protecting residue and the efficient application of mold thermal imager, reduce surface quality defects such as slab surface crack and oscillation mark.Thereby realize the quality steel plate base.
3, heating
In process furnace,, fully guarantee plate slab Heating temperature and soaking time to the plate slab heating.Heating and temperature control is at 1180 ℃～1250 ℃, and total time inside furnace is controlled at 240～270min, guarantees the abundant solid solution of alloying element, and the plate slab temperature is even.
4, rolling and cooling
Rolling employing roughing and finish rolling two stages controlled rolling, i.e. austenite recrystallization district controlled rolling (claiming rough rolling step usually) and austenite non-recrystallization zone controlled rolling (claiming the finish rolling stage usually).Strengthen pass deformation during roughing, start rolling temperature is 1160～1200 ℃, and the relative draft of single pass has at least twice time to be controlled at 25～40%.Strict each pass deformation of control during finish rolling, finish rolling start rolling temperature≤950 ℃ have twice draft＞20% at least, extreme trace time draft＞10%.Roll the back steel plate and adopt controlled chilling, final cooling temperature≤700 ℃ obtain the tiny and uniform ferritic+pearlitic structure of crystal grain.
5, normalizing thermal treatment
Rule of thumb formula and combine situ production actual confirms that normalizing temperature is 840 ℃～910 ℃, and soaking time is 10min+t * 1.5min/mm, and wherein t is a steel plate thickness, and unit is mm.
Beneficial effect of the present invention is:
1, through rational designing chemical composition, do not contain noble metals such as Ni, and other alloying element content is few, has reduced cost of alloy.
2, through the rational chemical design, take above-mentioned technology can obtain a kind of ys, have good plasticity, low-temperature impact toughness, high temperature tensile properties and good Z steel plate of pressure vessel to tensile property greater than 370MPa.
Description of drawings
Fig. 1 is the metallographic structure figure of the embodiment of the invention 3 steel plates.
Embodiment
Below with embodiment the present invention is made more detailed description.These embodiment only are the descriptions to best mode for carrying out the invention, scope of the present invention are not had any restriction.
Embodiment 1
The dark desulfurization of raw material molten iron process molten iron, the converter top and bottom blowing, ladle argon-blown, the LF external refining, RH vacuum-treat and continuous casting process obtain the 250mm heavy slab of the per-cent of chemical component weight shown in the table 1.1200 ℃ of slab heating temperatures, total time inside furnace 260min, 1180 ℃ of fs start rolling temperatures; The relative draft of single pass has at least more than two passages and is controlled at 25～40%; When rolled piece thickness is 100mm, on roller-way, treat temperature to 920 ℃, it is rolling to carry out subordinate phase subsequently; Finishing temperature is 890 ℃, and the Finished Steel plate thickness is 50mm.After the rolling end, steel plate get into to quicken cooling (ACC) device, is cooled to 680 ℃ with the speed of 5 ℃/s, and heat is rectified back cold bed cooling.Send into normalizing furnace behind the steel plate ball blast and handle, 880 ℃ of normalizing temperatures, soaking time are 10min+t * 1.5min/mm, and t is a steel plate thickness.Can obtain said steel plate at last.
Embodiment 2
Embodiment is with embodiment 1, and wherein Heating temperature is 1220 ℃, total time inside furnace 260min; Fs, rolling start rolling temperature was 1180 ℃, and the rolling start rolling temperature of subordinate phase is 920 ℃, and rolled piece thickness is 108mm; Finishing temperature is 890 ℃, and the Finished Steel plate thickness is 60mm.The steel plate speed of cooling is 5 ℃/s, and final cooling temperature is 680 ℃.Heat is rectified back cold bed cooling.Send into normalizing furnace behind the steel plate ball blast and handle, 880 ℃ of normalizing temperatures, soaking time are 10min+t * 1.5min/mm, and t is a steel plate thickness.Can obtain said steel plate at last.
Embodiment 3
Embodiment is with embodiment 1, and wherein Heating temperature is 1220 ℃, total time inside furnace 260min; Fs, rolling start rolling temperature was 1200 ℃, and the rolling start rolling temperature of subordinate phase is 1040 ℃, and rolled piece thickness is 30mm; Finishing temperature is 830 ℃, and the Finished Steel plate thickness is 10mm.Heat is rectified back cold bed cooling.Send into normalizing furnace behind the steel plate ball blast and handle, 880 ℃ of normalizing temperatures, soaking time are 10min+t * 1.5min/mm, and t is a steel plate thickness.Can obtain said steel plate at last.
The chemical ingredients (wt%) of table 1 embodiment of the invention 1-3
| Embodiment | C | Si | Mn | P | S | Nb | V | Ti | Als |
| 1 | 0.16 | 0.45 | 1.50 | 0.014 | 0.002 | 0.020 | 0.071 | 0.007 | 0.021 |
| 2 | 0.17 | 0.47 | 1.51 | 0.014 | 0.004 | 0.022 | 0.073 | 0.008 | 0.025 |
| 3 | 0.18 | 0.28 | 1.50 | 0.009 | 0.002 | 0.024 | 0.075 | 0.008 | 0.025 |
The steel plate of embodiment of the invention 1-3 is carried out conventional mechanical property, high temperature tensile properties and Z check to tensile property, the result sees table 2-table 4.
The mechanical property of the steel plate of table 2 embodiment of the invention 1-3
The high temperature tensile properties of table 3 embodiment of the invention 1 steel plate
The Z of table 4 embodiment of the invention 2 steel plates is to tensile property
Claims (2)
1. no Ni normalizing type Q370R steel plate of pressure vessel; It is characterized in that: the chemical ingredients of steel plate is C:0.15～0.18%, Si:0.25～0.50%, Mn:1.4～1.6%, P by weight percentage: S≤0.015% :≤0.005%, Nb:0.02～0.03%, V:0.07～0.08%, Ti:0.006～0.010%, Als:0.024～0.034%, surplus are Fe and unavoidable impurities.
2. the method for manufacture of a no Ni normalizing type Q370R steel plate of pressure vessel according to claim 1; It is characterized in that: adopt process pretreated molten iron of desulfurization and steel scrap as raw material; Obtaining chemical component weight per-cent through smelting is C:0.15～0.18%, Si:0.25～0.50%, Mn:1.4～1.6%, P: S≤0.015% :≤0.005%, Nb:0.02～0.03%, V:0.07～0.08%, Ti:0.006～0.010%, Als:0.024～0.034%, surplus are the steel of Fe and unavoidable impurities, on continuous caster, cast plate slab; To the plate slab heating, heating and temperature control is at 1180 ℃～1250 ℃ in process furnace, and total time inside furnace is controlled at 240～270min; Be rolled then, rolling employing roughing and finish rolling two stages controlled rolling, the roughing start rolling temperature is 1160～1200 ℃; The relative draft of single pass has at least twice time to be controlled at 25～40%, and finish rolling start rolling temperature≤950 ℃ have two passage draft＞20% at least; Extreme trace time draft＞10%; Roll the back steel plate and adopt controlled chilling, final cooling temperature≤700 ℃ obtain the steel plate that crystal grain is ferritic+pearlitic structure; At last steel plate is carried out normalizing thermal treatment, normalizing temperature is 840 ℃～910 ℃, and soaking time is 10min+t * 1.5min/mm, and wherein t is a steel plate thickness, and unit is mm.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103122436A (en) * | 2013-03-26 | 2013-05-29 | 内蒙古包钢钢联股份有限公司 | Steel plate for normalizing type low-temperature pressure vessel at-70 DEG C |
| CN103361550A (en) * | 2013-07-19 | 2013-10-23 | 武汉钢铁(集团)公司 | Q370 vessel steel with excellent simulated post-weld heat treatment performance and production method |
| CN111254362A (en) * | 2020-03-31 | 2020-06-09 | 湖南华菱湘潭钢铁有限公司 | Production method of Gr.B-grade normalizing pipeline steel |
| CN114875310A (en) * | 2022-04-22 | 2022-08-09 | 包头钢铁（集团）有限责任公司 | Normalizing type thick-specification Q370R pressure vessel steel plate |
| CN115141982A (en) * | 2022-07-05 | 2022-10-04 | 南京钢铁股份有限公司 | Steel plate for low-temperature pressure vessel and manufacturing method thereof |
| CN115287543A (en) * | 2022-08-19 | 2022-11-04 | 包头钢铁（集团）有限责任公司 | Steel plate for 14Cr1MoR medium temperature container and preparation method thereof |
| CN116590610A (en) * | 2023-04-17 | 2023-08-15 | 包头钢铁（集团）有限责任公司 | Normalizing type pressure vessel steel plate with yield strength of 370MPa and preparation method thereof |
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| CN102041446A (en) * | 2011-01-07 | 2011-05-04 | 南京钢铁股份有限公司 | Method for manufacturing Q390E-Z35 low-alloy and high-strength thick plate |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103122436A (en) * | 2013-03-26 | 2013-05-29 | 内蒙古包钢钢联股份有限公司 | Steel plate for normalizing type low-temperature pressure vessel at-70 DEG C |
| CN103361550A (en) * | 2013-07-19 | 2013-10-23 | 武汉钢铁(集团)公司 | Q370 vessel steel with excellent simulated post-weld heat treatment performance and production method |
| CN111254362A (en) * | 2020-03-31 | 2020-06-09 | 湖南华菱湘潭钢铁有限公司 | Production method of Gr.B-grade normalizing pipeline steel |
| CN111254362B (en) * | 2020-03-31 | 2021-01-19 | 湖南华菱湘潭钢铁有限公司 | Production method of Gr.B-grade normalizing pipeline steel |
| CN114875310A (en) * | 2022-04-22 | 2022-08-09 | 包头钢铁（集团）有限责任公司 | Normalizing type thick-specification Q370R pressure vessel steel plate |
| CN115141982A (en) * | 2022-07-05 | 2022-10-04 | 南京钢铁股份有限公司 | Steel plate for low-temperature pressure vessel and manufacturing method thereof |
| CN115287543A (en) * | 2022-08-19 | 2022-11-04 | 包头钢铁（集团）有限责任公司 | Steel plate for 14Cr1MoR medium temperature container and preparation method thereof |
| CN116590610A (en) * | 2023-04-17 | 2023-08-15 | 包头钢铁（集团）有限责任公司 | Normalizing type pressure vessel steel plate with yield strength of 370MPa and preparation method thereof |
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