CN106191686A - A kind of shipping steel of 800MPa level and preparation method thereof - Google Patents

A kind of shipping steel of 800MPa level and preparation method thereof Download PDF

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Publication number
CN106191686A
CN106191686A CN201610538979.7A CN201610538979A CN106191686A CN 106191686 A CN106191686 A CN 106191686A CN 201610538979 A CN201610538979 A CN 201610538979A CN 106191686 A CN106191686 A CN 106191686A
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temperature
rolling
steel
preparation
air cooling
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CN106191686B (en
Inventor
黄乐庆
狄国标
麻庆申
王彦锋
杨永达
刘美艳
马长文
隋鹤龙
王小勇
韩承良
杨春卫
黄少帅
汤海芳
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Shougang Group Co Ltd
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Shougang Corp
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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
    • 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
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/18—Hardening; Quenching with or without subsequent tempering
    • C21D1/25—Hardening, combined with annealing between 300 degrees Celsius and 600 degrees Celsius, i.e. heat refining ("Vergüten")
    • 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
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/001—Heat treatment of ferrous alloys containing Ni
    • 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
    • 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
    • C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
    • 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
    • C22C38/12—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
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • 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
    • C22C38/32—Ferrous alloys, e.g. steel alloys containing chromium with boron

Abstract

Shipping steel of a kind of 800MPa level and preparation method thereof, belongs to steel material technical field.Its chemical ingredients by weight percent is: C:0.05～0.10%, Si:0.10～0.25%, Mn:0.20～1.0%, P≤0.015%, S≤0.010%, B≤0.0015%, Ni:3.5～5.5%, Cr:0.3～0.9%, Mo:0.2～0.7% etc..Through converter smelting；It is heated to 1150～1200 DEG C, is incubated 2.5～3.5h；Roll through recrystallization zone rolling and Unhydrated cement；Then control cold；Last quenching heat treatment, hardening heat is 880～930 DEG C.Advantage is, the feature that intensity is high, plasticity is good and crack arrest characteristic is excellent.

Description

A kind of shipping steel of 800MPa level and preparation method thereof
Technical field
The invention belongs to steel material technical field, particularly to shipping steel and the preparation side thereof of a kind of 800MPa level Method.Particularly relate to a kind of 800MPa level NDTT shipping steel less than-80 DEG C and preparation method thereof.
Background technology
Along with the development of shipbuilding industry, to intensity, toughness, weldability and the surface quality performance of shipping steel material Requirement improves constantly.Especially for the above boats and ships of ton of off-lying sea navigating area, improving load to alleviate deadweight, its hull needs Use high-strength steel sheet；Simultaneously in order to ensure safety and the reliability of boats and ships, it is desirable to the deck of boat has under low temperature Service Environment There are good toughness and relatively low NDT temperature.
Yield strength mainly includes two classes higher than the production method of 700MPa level high-strength steel at present: a class is low-carbon bainite Steel series, how by adding the alloying elements such as Mo, Ni, Cr to improve solid solution strengthening effect, addition mainly taked by another kind of steel plate Ti, Nb, V micro alloying element, improves intensity by precipitation strength and refined crystalline strengthening.On the other hand, Ni is to improve iron and steel The element that the low-temperature flexibility effect of material is best, has therefore developed 1.5Ni, 3.5Ni, 5Ni and 9Ni according to the difference of Ni content Deng the cryogenic steel of different stage, these steel grades mostly are steel for low-temperature pressure container.
Patent No. CN102644030B provides the production method of a kind of 800MPa grade low-temp steel, and this steel grade is taked low C height Si, Mn, Cr and Nb, Ti microalloying composition design, concrete composition is C:0.04～0.14%, Si:0.20～ 0.50%, Mn:1.0～1.80%, Als:0.015～0.05%, P≤0.01%, S≤0.008%, Cr:0.10～0.50%, Ti:0.01～0.03%, Nb:0.10～0.50%, B:0.0008～0.0020%, remaining is Fe and inevitable impurity.Adopt Take two-phase control rolling, roll the PROCESS FOR TREATMENT of rear press quenching+tempering.Under technique described in this patent, yield strength is more than 800MPa, Elongation percentage is more than 18%, and-60 DEG C of ballistic works are more than 170J.From this patent from the point of view of intensity and impact flexibility index more excellent, but should Patent does not studies its NDTT performance.
Patent No. CN104388838A provides the production method of a kind of pressure vessel 5Ni steel plate, this steel grade chemistry Composition is as follows, C:0.07～0.10%, Si:0.15～0.30%, Mn:0.70～0.80%, P≤0.008%, S≤ 0.003%, Ni:4.90～5.25%, Alt:0.020～0.050%, Sn≤0.015%, Sb≤0.003%.Described in this patent The 5Ni steel yield strength produced under technique is more than 450MPa, and tensile strength is more than 590MPa, and elongation after fracture is more than 25% ,～ 125 DEG C of ballistic work averages are higher than 180J.Although this patent low-temperature good toughness, but its yield strength is on the low side.
Summary of the invention
It is an object of the invention to provide shipping steel of a kind of 800MPa level and preparation method thereof, solve off-lying sea navigating area Steel for ship requires the problem that high intensity, good toughness, crack arrest characteristic are excellent.Achieve employing controlled rolling+tune on generous printed line Matter technique produce shipping steel, reach yield strength >=800MPa, tensile strength >=900MPa, elongation after fracture >=17% ,-84 DEG C ballistic work >=130J, NDTT≤-80 DEG C, steel plate thickness specification is 20～40mm.
A kind of shipping steel of 800MPa level, wherein, chemical ingredients by weight percent is: C:0.05～0.10%, Si: 0.10～0.25%, Mn:0.20～1.0%, P≤0.015%, S≤0.010%, B≤0.0015%, Ni:3.5～5.5%, Cr:0.3～0.9%, Mo:0.2～0.7%, V:0.02～0.13%, remaining is Fe and inevitable impurity.
A kind of preparation method of the shipping steel of 800MPa level, concrete steps and parameter are as follows:
1, heating cycle: by heating steel billet to 1150～1200 DEG C, is incubated 2.5～3.5h；
2, rolling mill practice: use controlled rolling process, the operation of rolling is divided into two stages, recrystallization zone rolling and Unhydrated cement Rolling；Recrystallization zone stage rolling start rolling temperature is 1070～1120 DEG C, and accumulative reduction ratio >=50%, intermediate blank treats that temperature thickness is 2～4 times of finished product thicknesses；Treating that temperature carries out Unhydrated cement rolling to 850～890 DEG C, finishing temperature is 800～840 DEG C, ties the most again Brilliant accumulative reduction ratio >=20%；
3, roller repairing technique: roller repairing technique is two kinds, i.e. rolls rear air cooling to room temperature, or roll rear water-cooled to 420～ 470 DEG C, cooling by water speed is 10～15 DEG C/s.
4, the quenching-and-tempering process of quenching+tempering: hardening heat is 880～930 DEG C, temperature retention time is 2.5min/ Mm t, rear shrend；Temperature is 610～650 DEG C, and temperature retention time is 3min/mm*t, and then air cooling is to room temperature, and wherein t is Finished product thickness.
The composition mentality of designing of the present invention is as follows: C content: 0.05～0.10wt%, has both ensured that steel plate had certain consolidating Molten strengthening effect, and relatively low carbon content makes this steel grade have relatively low ductile-brittle transition temperature and good welding Property；Higher Ni:3.5～5.5wt% content, the resistance that when can reduce low temperature, dislocation is moved in the base, improves layer simultaneously Wrong energy, during suppression low temperature, a large amount of formation of dislocation, promote the commutative Banach aglebra of dislocation during low temperature so that the consumed work increasing of cracks can spread Add, reduce the ductile-brittle transition temperature of steel, thus significantly improve the low-temperature flexibility of material；Addition one side of V:0.02～0.13wt% Face can form hardening constituent with C and N, thus ensures the intensity of material, and the addition of V simultaneously can ensure that the hardness of quenched rear material Stability；The effect of solution strengthening is played in the addition of Mn, Mo and Cr element, improves the quenching degree of material simultaneously；Strictly control steel The degree of purity of water, it is to avoid mechanical property on steel plate of impurity element P, S and the impact of low-temperature flexibility.
The technological design thinking of the present invention is as follows: first stage recrystallization zone rolling uses higher reduction ratio, it is ensured that steel The compactness of plate and the uniformity of original austenite grain；The rolling of second stage Unhydrated cement uses controlled rolling process, it is ensured that group Knit crystal grain tiny；By rational hardening and tempering process, it is ensured that steel plate has high intensity and good low-temperature flexibility concurrently.
It is an advantage of the current invention that the feature that armor plate strength is high, plasticity is good and crack arrest characteristic is excellent of production, specifically embody : yield strength >=800MPa, tensile strength >=900MPa, elongation after fracture >=17% ,-84 DEG C of ballistic work >=130J, NDTT ≤-80℃。
Accompanying drawing explanation
Fig. 1 is the micro-organization chart of embodiment 1.
Detailed description of the invention
Embodiment 1
The chemical component weight percentage ratio of steel billet includes, C:0.081%, Si:0.22%, Mn:0.84%, P:0.007%, S:0.0041%, B:0.001%, Ni:4.78%, Cr:0.74%, Mo:0.62%, V:0.050%, remaining is for Fe and can not keep away Exempt from impurity.
1, smelt and forge: utilizing 500Kg vacuum smelting furnace to make steel, after having cast, be forged to 175mm steel billet；
2, heating cycle: be heated to 1200 DEG C, is incubated 3h；
3, rolling mill practice: the operation of rolling is divided into two stages, recrystallization zone rolling and Unhydrated cement to roll: recrystallization zone Stage rolling start rolling temperature is 1087 DEG C, rolls 4 passages to intermediate blank altogether and treats temperature thickness 60mm；Treat that temperature is carried out to 870 DEG C the most again Crystal region rolls, finishing temperature 817 DEG C, rolls 5 passages altogether to target thickness 20mm；
4, roller repairing technique: roll rear air cooling to room temperature；
5, Technology for Heating Processing: shrend after hardening heat 900 DEG C insulation 50min, temperature 650 DEG C insulation 60min, comes out of the stove Air cooling；
The 800MPa level shipping steel of the present embodiment is carried out mechanics properties testing, and mechanical property is: yield strength 847MPa, tensile strength 913MPa, elongation after fracture 20.0% ,-20 DEG C of side knock merits: 227J, 210J, 217J ,-84 DEG C of horizontal strokes To ballistic work: 139J, 177J, 178J ,-80 DEG C of drop hammer test results show that the crackle that formation of crack welding bead is formed does not expands to tension The seamed edge in face, block hammer performance is qualified.
Embodiment 2
The chemical composition of steel billet content by weight percentage includes, C:0.078%, Si:0.21%, Mn:0.69%, P: 0.007%, S:0.0041%, B:0.0006%, Ni:4.5%, Cr:0.667%, Mo:0.527%, V:0.043%, remaining is Fe and inevitable impurity.
Smelt and forging, heating cycle are with embodiment 1.
Rolling mill practice: the operation of rolling is divided into two stages, recrystallization zone rolling and Unhydrated cement to roll: rank, recrystallization zone Section rolling start rolling temperature is 1057 DEG C, rolls 4 passages to intermediate blank altogether and treats temperature thickness 60mm；Treat that temperature is tied to 860 DEG C the most again Crystalline region rolls, finishing temperature 810 DEG C, rolls 5 passages altogether to target thickness 20mm；
Roller repairing technique: rolling rear water-cooled to 450 DEG C, 12 DEG C/s of rate of cooling, then air cooling is to room temperature；
Technology for Heating Processing: shrend after hardening heat 900 DEG C insulation 50min, temperature 640 DEG C insulation 60min, sky of coming out of the stove Cold；
The 800MPa level shipping steel of the present embodiment is carried out mechanics properties testing, and mechanical property is: yield strength 912MPa, tensile strength 953MPa, elongation after fracture 17.0% ,-20 DEG C of side knock merits: 203J, 202J, 195J ,-84 DEG C of horizontal strokes To ballistic work: 163J, 142J, 150J ,-80 DEG C of drop hammer test results show that the crackle that formation of crack welding bead is formed does not expands to tension The seamed edge in face, block hammer performance is qualified.
Embodiment 3
The chemical composition of steel billet content by weight percentage includes, C:0.076%, Si:0.20%, Mn:0.83%, P: 0.007%, S:0.0044%, B:0.0003%, Ni:4.83%, Cr:0.73%, Mo:0.521%, V:0.039%, remaining is Fe and inevitable impurity.
Smelt and forging, heating cycle are with embodiment 1；
Rolling mill practice: the operation of rolling is divided into two stages, recrystallization zone rolling and Unhydrated cement to roll: rank, recrystallization zone Section rolling start rolling temperature is 1050 DEG C, rolls 3 passages to intermediate blank altogether and treats temperature thickness 85mm；Treat that temperature is tied to 850 DEG C the most again Crystalline region rolls, finishing temperature 820 DEG C, rolls 3 passages altogether to target thickness 40mm；
Roller repairing technique: roll rear air cooling to room temperature；
Technology for Heating Processing: shrend after hardening heat 910 DEG C insulation 100min, temperature 620 DEG C insulation 120min, comes out of the stove Air cooling；
The 800MPa level shipping steel of the present embodiment is carried out mechanics properties testing, and mechanical property is: yield strength 899MPa, tensile strength 942MPa, elongation after fracture 19.0% ,-20 DEG C of side knock merits: 187J, 195J, 202J ,-84 DEG C of horizontal strokes 147,153,159J to ballistic work: ,-80 DEG C of drop hammer test results show that the crackle that formation of crack welding bead is formed does not expands to tension face Seamed edge, block hammer performance is qualified.

Claims (5)

  1. The 1. shipping steel of a 800MPa level, it is characterised in that chemical ingredients by weight percent is: C:0.05～0.10%, Si:0.10～0.25%, Mn:0.20～1.0%, P≤0.015%, S≤0.010%, B≤0.0015%, Ni:3.5～ 5.5%, Cr:0.3～0.9%, Mo:0.2～0.7%, V:0.02～0.13%, remaining is Fe and inevitable impurity.
  2. 2. the preparation method of the shipping steel described in a claim 1, it is characterised in that concrete steps and parameter are as follows:
    1) heating cycle: by heating steel billet to 1150～1200 DEG C, is incubated 2.5～3.5h；
    2) rolling mill practice: use controlled rolling process, the operation of rolling is divided into two stages, recrystallization zone rolling and Unhydrated cement to roll System；
    3) roller repairing technique: roller repairing technique is air cooling or water-cooled；
    4) quenching-and-tempering process of quenching+tempering: hardening heat is 880～930 DEG C, temperature retention time is 2.5min/mm t, Rear shrend；Temperature is 610～650 DEG C, and temperature retention time is 3min/mm t, and then air cooling is to room temperature.
  3. Preparation method the most according to claim 2, it is characterised in that described step 2) in recrystallization zone stage rolling Start rolling temperature is 1070～1120 DEG C, and accumulative reduction ratio >=50%, intermediate blank treats that temperature thickness is 2～4 times of finished product thicknesses；Treat that temperature is extremely 850～890 DEG C carry out Unhydrated cement rolling, and finishing temperature is 800～840 DEG C, and non-recrystallization adds up reduction ratio >=20%.
  4. Preparation method the most according to claim 2, it is characterised in that described step 3) in cooling control after rolling or water-cooled i.e. roll Rear air cooling is to room temperature, or rolls rear water-cooled to 420～470 DEG C, and cooling by water speed is 10～15 DEG C/s.
  5. Preparation method the most according to claim 2, it is characterised in that described step 4) in t be finished product thickness.
CN201610538979.7A 2016-07-08 2016-07-08 A kind of shipping steel 800MPa grades and preparation method thereof Active CN106191686B (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108588561A (en) * 2018-05-30 2018-09-28 舞阳钢铁有限责任公司 A kind of pavior brick mold steel plate and its production method
CN114395731A (en) * 2021-12-16 2022-04-26 南阳汉冶特钢有限公司 Low-welding crack sensitivity crack arrest steel HY950CF for hydroelectric engineering and production method thereof

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61149429A (en) * 1984-12-25 1986-07-08 Kawasaki Steel Corp Manufacture of high tension steel
JP2003253380A (en) * 2002-02-26 2003-09-10 Jfe Steel Kk High-strength steel superior in toughness of heat- affected zone by ultra-high heat input welding
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
CN103014541A (en) * 2012-12-21 2013-04-03 首钢总公司 690MPa thick steel plate for ocean engineering and manufacturing method of steel plate
CN104195428A (en) * 2014-07-31 2014-12-10 南京钢铁股份有限公司 High-strength V-containing and low-C 5Ni steel medium plate and manufacturing method of steel medium plate

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61149429A (en) * 1984-12-25 1986-07-08 Kawasaki Steel Corp Manufacture of high tension steel
JP2003253380A (en) * 2002-02-26 2003-09-10 Jfe Steel Kk High-strength steel superior in toughness of heat- affected zone by ultra-high heat input welding
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
CN103014541A (en) * 2012-12-21 2013-04-03 首钢总公司 690MPa thick steel plate for ocean engineering and manufacturing method of steel plate
CN104195428A (en) * 2014-07-31 2014-12-10 南京钢铁股份有限公司 High-strength V-containing and low-C 5Ni steel medium plate and manufacturing method of steel medium plate

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108588561A (en) * 2018-05-30 2018-09-28 舞阳钢铁有限责任公司 A kind of pavior brick mold steel plate and its production method
CN114395731A (en) * 2021-12-16 2022-04-26 南阳汉冶特钢有限公司 Low-welding crack sensitivity crack arrest steel HY950CF for hydroelectric engineering and production method thereof

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Address after: 100041 Shijingshan Road, Shijingshan District, Shijingshan District, Beijing

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Address before: 100041 Shijingshan Road, Shijingshan District, Shijingshan District, Beijing

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