CN108396234A - A kind of production method of EH460 seatainers crack arrest steel plate - Google Patents

A kind of production method of EH460 seatainers crack arrest steel plate Download PDF

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Publication number
CN108396234A
CN108396234A CN201710064779.7A CN201710064779A CN108396234A CN 108396234 A CN108396234 A CN 108396234A CN 201710064779 A CN201710064779 A CN 201710064779A CN 108396234 A CN108396234 A CN 108396234A
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CN
China
Prior art keywords
rolling
temperature
steel plate
crack arrest
controlled
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Pending
Application number
CN201710064779.7A
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Chinese (zh)
Inventor
肖青松
张坤
王若刚
李新玲
应传涛
刘源
乔馨
周强
潘凯华
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Angang Steel Co Ltd
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Angang Steel Co Ltd
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Publication date
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Priority to CN201710064779.7A priority Critical patent/CN108396234A/en
Publication of CN108396234A publication Critical patent/CN108396234A/en
Pending legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
    • C21D8/0226—Hot rolling
    • 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
    • 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
    • C22C38/08—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

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Heat Treatment Of Steel (AREA)

Abstract

The present invention provides a kind of production method of EH460 seatainers crack arrest steel plate, and chemical composition is：C:0.05~0.07%, Si：0.25~0.35%, Mn：1.15~1.25%, Nb:0.03~0.05%, P≤0.01%, S≤0.002%, Ni：0.28 0.32%, Ti：0.008~0.015%.Control billet heating temperature, soaking temperature and heating time；Hot rolling uses the controlled rolling of four stages, the rolling of two-stage to four stages to ensure that single pass reduction ratio is more than 15%；It is cooled down, is controlled into coolant-temperature gage and red temperature using online ACC, controlled cold using semiautomatic-mode control, the cold parameter of manual setting control；It is immediately placed in burial pit after rolling, replaces stacking mode, stacking time >=72 hour with crack arrest steel plate using other 300 DEG C or more hot steel plates.Crack arrest steel plate 505~550MPa of yield strength value of the present invention, 655~695MPa of tensile strength, 20~28.3%, 40 DEG C of 125~223J of single impact value of elongation percentage, properties percent of pass meet product requirement.

Description

A kind of production method of EH460 seatainers crack arrest steel plate
Technical field
The invention belongs to metallurgical technology technical field, more particularly to a kind of production of EH460 seatainers crack arrest steel plate Method
Background technology
In recent years, being continuously increased with marine Material Transportation amount has driven container ship to develop to enlarged direction.Collection The upper deck of vanning ship has large-scale opening, and for large-scale merchant ship, ship beam cleaved facet bears longitudinal strength maximum, common to do Method is to increase the thickness of Hatch Opening edge steel plate and upper deck steel plate, the steel plate for generally using thickness to be more than 50mm.
For steel plate, the plane strain state plastic region inside steel plate becomes smaller, under the action of yield stress, Big stress is easy tod produce inside steel plate and makes crack propagation, to prevent brittle fracture, ensures the safety of ship, to pre- in ship It surveys the position that brittle fracture may occur and the large-scale significant points being broken may be caused, it is desirable that using has good fracture toughness With the steel for inhibiting brittle-cracking propagation characteristic.
Currently, the domestic method for generally using crystalline grain refinement improves the crack arrest characteristic of steel, however, with thickness Increase, this method effect unobvious, when plate thickness reaches 80mm, it is difficult to ensure the crack arrest characteristic of steel.
Certain steel branch company proceeds by the process trial of 80mm or less thickness Es H460, trial-production early period from May, 2015 Steel is mainly burnt using medium temperature, two-stage controlled rolling controls red temperature, rolls four aspects of rear stacking slow cooling and carries out technique control System.Inspection result shows that low temperature impact properties are discrete, and numerical value is generally relatively low, and component values cannot be satisfied ship less than lower limit requirement With the performance of container crack arrest steel.
Invention content
The present invention provides a kind of production method of EH460 seatainers crack arrest steel plate, and purpose is intended to improve 40-80mm The impact property of thick EH460 seatainers crack arrest steel.
For this purpose, the technical solution that the present invention is taken is：
A kind of production method of EH460 seatainers crack arrest steel plate, specially：
(1) chemical component weight percentage is：C:0.05~0.07%, Si：0.25~0.35%, Mn：1.15~ 1.25%, Nb:0.03~0.05%, P≤0.01%, S≤0.002%, Ni：0.28-0.32%, Ti：0.008~0.015%, Remaining is Fe and inevitable impurity.
(2) billet heating temperature control is at 1170 ± 20 DEG C, and soaking temperature control is at 1150 ± 20 DEG C, heating time 9 ~11min/cm.
(3) hot rolling technology is the controlled rolling of four stages, and the rolling of two-stage to four stages ensures that single pass reduction ratio is more than 15%；Wherein：One 1020~1060 DEG C of stage start rolling temperature, waits for 270~280mm of strip plate thickness；Two-stage start rolling temperature 910~ 950 DEG C, wait for 185~235mm of strip plate thickness；Three 850~890 DEG C of stage start rolling temperatures, wait for 85~165mm of strip plate thickness；Quadravalence 740~780 DEG C of start rolling temperature of section, 40~80mm of finished product thickness.
(4) cold technique is controlled：The type of cooling is online ACC coolings, enters 660~680 DEG C of coolant-temperature gage, 100 DEG C of red temperature with Under, it controls cold using semiautomatic-mode control, the cold parameter of manual setting control, upper 290~310l/ of water (m2* min), lower water 580 ~620l/ (m2* min), 0.4~0.6m/s of roller speed.
(5) retarded cooling process：Burial pit is immediately placed in after rolling, using other 300 DEG C or more hot steel plates and crack arrest steel Plate replaces stacking mode, carries out burial pit heat preservation and furnace cooling, stacking time >=72 hour.
Beneficial effects of the present invention are：
Seatainer crack arrest steel steel plate after 40~80mm that the present invention produces in batches, property indices reach ideal It is required that.Its mechanical property is：505~550MPa of yield strength value, 655~695MPa of tensile strength, elongation percentage 20~ 28.3%, -40 DEG C of 125~223J of single impact value, properties percent of pass meets product requirement.
Specific implementation mode
Embodiment 1：
1, chemical component weight percentage is：C:0.06%, Si：0.30%, Mn：1.20%, Nb:0.04%, P≤ 0.01%, S≤0.002%, Ni：0.30%, Ti：0.011%, remaining is Fe and inevitable impurity.
2, billet heating temperature control is at 1170 DEG C, and soaking temperature control is at 1150 DEG C, heating time 10min/cm.
3, hot rolling technology is the controlled rolling of four stages, and the rolling of two-stage to four stages ensures that single pass reduction ratio is respectively 20%, 18%, 16%.One 1040 DEG C of stage start rolling temperature, waits for strip plate thickness 270mm；930 DEG C of two-stage start rolling temperature, it is to be rolled Base thickness 180mm；Three 870 DEG C of stage start rolling temperatures, wait for strip plate thickness 100mm；Four 760 DEG C of stage start rolling temperatures, finished product thickness 60mm。
4, cold technique is controlled：The type of cooling cools down for online ACC, enters 670 DEG C of coolant-temperature gage, 90 DEG C of red temperature controls cold use Semiautomatic-mode controls, the cold parameter of manual setting control, upper water 300l/ (m2* min), lower water 600l/ (m2* min), roller speed 0.5m/s。
5, retarded cooling process：It is immediately placed in burial pit after rolling, is replaced with crack arrest steel plate using other 350 DEG C of hot steel plates Stacking mode carries out burial pit heat preservation and furnace cooling, 75 hours stacking time.
Embodiment 2：
1, chemical component weight percentage is：C:0.065%, Si：0.33%, Mn：1.22%, Nb:0.042%, P≤ 0.01%, S≤0.002%, Ni：0.30%, Ti：0.013%, remaining is Fe and inevitable impurity.
2, at 1185 DEG C, soaking temperature control is in 1170 DEG C, heating time for billet heating temperature control
10min/cm。
3, hot rolling technology is the controlled rolling of four stages, and the rolling of two-stage to four stages ensures that single pass reduction ratio is respectively 22%, 20%, 18%.One 1060 DEG C of stage start rolling temperature, waits for strip plate thickness 280mm；950 DEG C of two-stage start rolling temperature, it is to be rolled Base thickness 230mm；Three 890 DEG C of stage start rolling temperatures, wait for strip plate thickness 155mm；Four 775 DEG C of stage start rolling temperatures, finished product thickness 80mm。
4, cold technique is controlled：The type of cooling cools down for online ACC, enters 685 DEG C of coolant-temperature gage, 100 DEG C of red temperature controls cold use Semiautomatic-mode controls, the cold parameter of manual setting control, upper water 300l/ (m2* min), lower water 600l/ (m2* min), roller speed 0.5m/s。
5, retarded cooling process：It is immediately placed in burial pit after rolling, is replaced with crack arrest steel plate using other 360 DEG C of hot steel plates Stacking mode carries out burial pit heat preservation and furnace cooling, 90 hours stacking time.

Claims (1)

1. a kind of production method of EH460 seatainers crack arrest steel plate, it is characterised in that：
(1) chemical component weight percentage is：C:0.05~0.07%, Si：0.25~0.35%, Mn：1.15~1.25%, Nb:0.03~0.05%, P≤0.01%, S≤0.002%, Ni：0.28-0.32%, Ti：0.008~0.015%, remaining is Fe and inevitable impurity；
(2) billet heating temperature control is at 1170 ± 20 DEG C, soaking temperature control at 1150 ± 20 DEG C, heating time is 9~ 11min/cm；
(3) hot rolling technology is the controlled rolling of four stages, and the rolling of two-stage to four stages ensures that single pass reduction ratio is more than 15%； Wherein：One 1020~1060 DEG C of stage start rolling temperature, waits for 270~280mm of strip plate thickness；Two-stage start rolling temperature 910~950 DEG C, wait for 185~235mm of strip plate thickness；Three 850~890 DEG C of stage start rolling temperatures, wait for 85~165mm of strip plate thickness；Four stages opened Roll 740~780 DEG C of temperature, 40~80mm of finished product thickness；
(4) cold technique is controlled：The type of cooling cools down for online ACC, enters 660~680 DEG C of coolant-temperature gage, and 100 DEG C of red temperature is hereinafter, control It is cold to be controlled using semiautomatic-mode, the cold parameter of manual setting control, upper 290~310l/ of water (m2* min), lower water 580~ 620l/(m2* min), 0.4~0.6m/s of roller speed；
(5) retarded cooling process：It is immediately placed in burial pit after rolling, is handed over using other 300 DEG C or more hot steel plates and crack arrest steel plate For the mode of stacking, burial pit heat preservation and furnace cooling, stacking time >=72 hour are carried out.
CN201710064779.7A 2017-02-05 2017-02-05 A kind of production method of EH460 seatainers crack arrest steel plate Pending CN108396234A (en)

Priority Applications (1)

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CN201710064779.7A CN108396234A (en) 2017-02-05 2017-02-05 A kind of production method of EH460 seatainers crack arrest steel plate

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110257703A (en) * 2019-06-25 2019-09-20 鞍钢股份有限公司 A kind of production method of thin gauge High Strength Container steel plate
CN113549846A (en) * 2021-07-13 2021-10-26 鞍钢股份有限公司 550 MPa-grade marine steel with excellent low-temperature performance and manufacturing method thereof
WO2022160529A1 (en) * 2021-01-26 2022-08-04 南京钢铁股份有限公司 High-toughness heat-resistant flat-bulb steel for ship and preparation method for flat-bulb steel

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110257703A (en) * 2019-06-25 2019-09-20 鞍钢股份有限公司 A kind of production method of thin gauge High Strength Container steel plate
WO2022160529A1 (en) * 2021-01-26 2022-08-04 南京钢铁股份有限公司 High-toughness heat-resistant flat-bulb steel for ship and preparation method for flat-bulb steel
CN113549846A (en) * 2021-07-13 2021-10-26 鞍钢股份有限公司 550 MPa-grade marine steel with excellent low-temperature performance and manufacturing method thereof

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Application publication date: 20180814