CN110453144A - A kind of 400MPa grades of valve snail steel and preparation method - Google Patents

A kind of 400MPa grades of valve snail steel and preparation method Download PDF

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Publication number
CN110453144A
CN110453144A CN201910732565.1A CN201910732565A CN110453144A CN 110453144 A CN110453144 A CN 110453144A CN 201910732565 A CN201910732565 A CN 201910732565A CN 110453144 A CN110453144 A CN 110453144A
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CN
China
Prior art keywords
steel
valve snail
400mpa
temperature
grades
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Pending
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CN201910732565.1A
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Chinese (zh)
Inventor
黄亚鹤
朱守欣
程维玮
胡志勇
鲁川
黄志杰
彭学艺
成建兵
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Nanjing Iron and Steel Co Ltd
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Nanjing Iron and Steel Co Ltd
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Priority to CN201910732565.1A priority Critical patent/CN110453144A/en
Publication of CN110453144A publication Critical patent/CN110453144A/en
Pending legal-status Critical Current

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    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING 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
    • C21D8/00Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/06Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
    • C21D8/065Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires of ferrous alloys
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C33/00Making ferrous alloys
    • C22C33/04Making ferrous alloys by melting
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/02Ferrous alloys, e.g. steel alloys containing silicon
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/04Ferrous alloys, e.g. steel alloys containing manganese
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00Technologies related to metal processing
    • Y02P10/20Recycling

Abstract

The invention discloses a kind of 400MPa grades of valve snail steel and preparation method, the weight percent of chemical component is C:0.21~0.25wt%, Si:0.40~0.60wt% in the valve snail steel, Mn:0.70~0.80wt%, P≤0.045wt%, S≤0.045wt%, remaining is Fe and impurity;The preparation method of the valve snail steel is the following steps are included: (1) loading molten iron and steel scrap into converter, reaches finishing blowing after terminal ingredient and temperature;(2) tapping process is with addition of silicomangan, ferrosilicon and high purity graphite carbon dust;(3) total argon blowing time reaches 5min or more after furnace and composition detection qualification is cast, and obtains blank;(4) qualified blank is rolled.High production efficiency of the present invention, blank cost reduce, and to the precious alloys resources such as niobium, vanadium, titanium are saved, promote economic benefit, reduce environmental pressure and are of great significance.

Description

A kind of 400MPa grades of valve snail steel and preparation method
Technical field
The present invention relates to a kind of 400MPa grades of valve snail steel and the 400MPa grade disks of preparation method more particularly to a kind of low cost Spiral shell steel and preparation method.
Background technique
Screw-thread steel belongs to the huge common steel products of yield, and cost of alloy and manufacturing cost are to determine that each screw-thread steel is raw Produce the basis of enterprise product cost.Concrete reinforcement steel GB/T1499.2-2018 hot rolled ribbed bars new standard, increases pair The detection of screw-thread steel microstructure, strict control screw-thread steel wear by force hydraulic art.After new standard executes, tempering is generated after reinforcing bar rolling The immediate quenching technique (namely wearing hydraulic art by force) of martensitic structure has been eliminated, if reinforcing bar manufacturing enterprise is without microalloy Change with cooling controlling and rolling controlling process Optimal improvements, then can only be by the way that the contents of the elements such as silicon in steel, manganese, vanadium, niobium be significantly increased To meet requirement of the new standard to microstructure and property.But vanadium, niobium price are higher, and vanadium system alloy price rigidity is poor, simultaneously Silicon, manganese alloy price also have biggish rising range, this brings heavy pressure to the production cost of screw-thread steel.
Valve snail is a kind of important distinguishing products in screw thread steel product, and existing market dosage is maximum for 400MPa grades of productions Product.Due to the features such as same circle of wire product is poor, overlapped points, distortional stress, so that the stability of valve snail steel controls difficulty It increases, phenomena such as mainly there are performances for most distinct issues with enclosing difference, no yield point elongation.Therefore, most enterprises are at present Tissue, the stability for guaranteeing valve snail steel, mostly use vanadium micro-alloying, VN alloy, Cr microalloying, niobium micro-alloy Alloying ingredients design, the ingredient such as change to design so that stability increases, but also cause the blank alloy of valve snail at Originally it greatly increases.
Summary of the invention
Goal of the invention: the present invention proposes a kind of 400MPa grade valve snail steel of low cost, can be realized and does not add niobium, vanadium, titanium The 400MPa grade valve snail steel of equal precious alloys, reduces cost, improves the stability of product.
It is another object of the present invention to propose the preparation method based on above-mentioned valve snail steel.
Technical solution: the weight percent of a kind of 400MPa grades of valve snail steel of the present invention, chemical component is C: 0.21~0.25wt%, Si:0.40~0.60wt%, Mn:0.70~0.80wt%, P≤0.045wt%, S≤0.045wt%, Remaining is Fe and impurity.
The preparation method of 400MPa grade valve snail steel of the invention, comprising the following steps: (1) be packed into molten iron into converter and give up Steel reaches finishing blowing after terminal ingredient and temperature;(2) tapping process is with addition of silicomangan, ferrosilicon and high purity graphite carbon dust, out Steel terminates;(3) total argon blowing time reaches 5min or more after furnace and composition detection qualification is cast, and obtains blank;(4) to qualified base Material is rolled, and 400MPa grades of valve snail steel are obtained.
Preferably, the pulling rate cast in the step (3) is 2.5~3.5m/s.
Preferably, in the step (4) rolling include blank heating, roughing, in roll, pre- finish rolling, water cooling, finish rolling are cut, water It is cold, subtract sizing, water cooling, spinning and air-cooled process;It is furthermore preferred that start rolling temperature is 880~950 DEG C in the rolling, finish rolling temperature Degree is 850~880 DEG C, and subtracting sizing temperature is 730~760 DEG C, and laying temperature is 740~760 DEG C;It is further preferred that described Blower aperture is 50%~90% in air-cooled process, the cover standard-sized sheet.
The utility model has the advantages that the invention has the following advantages that (1) does not add the precious alloys such as niobium, vanadium, titanium, the alloy of blank at Originally it substantially reduces;(2) it does not need additionally to carry out scrap build or increases equipment, small investment;(3) the strong plasticity index of product is good It is good;(4) the preparation method efficiency, casting rate and mill speed are high, improve production efficiency;(5) to save niobium, vanadium, The precious alloys resource such as titanium promotes economic benefit, reduces environmental pressure and has important practical significance.
Specific embodiment
Embodiment 1
92 tons of molten iron and 18 tons of addition converters of steel scrap are blown, terminal oxygen 370ppm, aim carbon after finishing blowing 0.077%, 1655 DEG C of tapping temperature, total argon blowing time 480s after furnace;Tapping process carries out alloying operation, and silicomangan is added 947kg, ferrosilicon 303kg and high purity graphite carbon dust 180kg, tapping terminate;Detecting melting finished product sample ingredient is C:0.21%, Si: 0.40%, Mn:0.70%, P:0.045%, S:0.020%, testing result qualification are cast, pulling rate 3.5m/s.Then high line Producing line rolls qualified blank, specification be Φ 8mm, respectively by blank heating, roughing, in roll, pre- finish rolling, water cooling, essence It rolls and cuts, water cooling, subtracts sizing, water cooling, spinning and Stevr and rub air-cooled process, wherein 880 DEG C of start rolling temperature, into finishing mill temperature 850 DEG C, into subtracting 730 DEG C of sizing temperature, 740 DEG C of laying temperature, mill speed 90m/s, blower 1#/2# aperture is 90%, 3#/4# It is 75%, 7#/8# aperture is 50% that aperture, which is 85%, 5#/6# aperture, and the cover standard-sized sheet obtains 400MPa grades of valve snail steel.Through detection institute Obtaining stocking microstructure is ferrite and pearlite, does not find other abnormal structures, yield strength 445MPa, tensile strength 605MPa, elongation after fracture 24%, maximum, force breaking elongation 12.5%, strong flexor ratio 1.36 bend ratio 1.11 in the wrong, bending and recurvation It can be qualified.
Embodiment 2
90 tons of molten iron and 20 tons of addition converters of steel scrap are blown, after finishing blowing, terminal oxygen 350ppm, aim carbon 0.085%, 1665 DEG C of tapping temperature, total argon blowing time 490s after furnace;Tapping process carries out alloying operation, and silicomangan is added 1173kg, ferrosilicon 400kg and high purity graphite carbon dust 200kg, tapping terminate;It is C:0.24% through detection melting finished product sample ingredient, Si:0.50%, Mn:0.75%, P:0.025%, S:0.028%, testing result qualification are cast, pulling rate 2.5m/s.Then High line producing line rolls qualified blank, specification Φ 8mm, respectively by blank heating, roughing, in roll, pre- finish rolling, water cooling, Finish rolling cuts, water cooling, subtracts sizing, water cooling, spinning and Stevr and rubs air-cooled process, wherein 905 DEG C of start rolling temperature, into finishing mill temperature 865 DEG C, into subtracting 740 DEG C of sizing temperature, 750 DEG C of laying temperature, mill speed 90m/s, blower 1#/2# aperture is 90%, 3#/4# It is 75%, 7#/8# aperture is 50% that aperture, which is 85%, 5#/6# aperture, and the cover standard-sized sheet obtains 400MPa grades of valve snail steel.Through detection institute Obtaining stocking microstructure is ferrite and pearlite, does not find other abnormal structures, yield strength 470MPa, tensile strength 640MPa, elongation after fracture 24%, maximum, force breaking elongation 11.5%, strong flexor ratio 1.37 bend ratio 1.18 in the wrong, bending and recurvation It can be qualified.
Embodiment 3
90 tons of molten iron and 18 tons of addition converters of steel scrap are blown, after finishing blowing, terminal oxygen 365ppm, aim carbon 0.080%, 1645 DEG C of tapping temperature, total argon blowing time 470s after furnace;Tapping process carries out alloying operation, and silicomangan is added 1083kg, ferrosilicon 532kg and high purity graphite carbon dust 215kg, tapping terminate;It is C:0.25% through detection melting finished product sample ingredient, Si:0.60%, Mn:0.80%, P:0.028%, S:0.045%, testing result qualification are cast, pulling rate 3.0m/s.Then High line producing line rolls qualified blank, specification Φ 10mm, respectively by blank heating, roughing, in roll, pre- finish rolling, water cooling, Finish rolling cuts, water cooling, subtracts sizing, water cooling, spinning and Stevr and rubs air-cooled process, and wherein start rolling temperature is at 950 DEG C, into finishing mill temperature 880 DEG C of degree, into subtracting 760 DEG C of sizing temperature, 760 DEG C of laying temperature, mill speed 75m/s, blower 1#/2# aperture be 90%, 3#/ It is 75%, 7#/8# aperture is 50% that 4# aperture, which is 85%, 5#/6# aperture, and the cover standard-sized sheet obtains 400MPa grades of valve snail steel.Through detecting Gained stocking microstructure is ferrite and pearlite, does not find other abnormal structures, yield strength 475MPa, tensile strength 645MPa, elongation after fracture 25%, maximum, force breaking elongation 12.5%, strong flexor ratio 1.36 bend ratio 1.19 in the wrong, bending and recurvation It can be qualified.
Argon 5min or more can carry out pouring operation after above-described embodiment 1~3 passes through furnace, and casting pulling rate reaches 3.5m/ Min, blank production efficiency greatly improve;In the blank operation of rolling, is pricked using control and control cold technique to realize refined crystalline strengthening and phase Become and strengthen, organizes to add pearlitic structrure for ferrite, the strong plasticity index of product is good, and Φ 8mm specification mill speed reaches 90m/ S, Φ 10mm specification are rolled up to speed 75m/s;The preparation method makes the screw thread steel billet for not adding the precious alloys such as niobium, vanadium, titanium The performance indexes of material can better meet the requirement of the 400MPa grade valve snail steel of GB/T1499.2-2018.

Claims (6)

1. a kind of 400MPa grades of valve snail steel, it is characterised in that: the weight percent of its chemical component is C:0.21~0.25wt%, Si:0.40~0.60wt%, Mn:0.70~0.80wt%, P≤0.045wt%, S≤0.045wt%, remaining is Fe and impurity.
2. a kind of preparation method of 400MPa as described in claim 1 grades of valve snail steel, it is characterised in that: the following steps are included:
(1) it is packed into molten iron and steel scrap into converter, reaches finishing blowing after terminal ingredient and temperature;
(2) tapping process terminates with addition of silicomangan, ferrosilicon and high purity graphite carbon dust, tapping;
(3) total argon blowing time reaches 5min or more after furnace and composition detection qualification is cast, and obtains blank;
(4) qualified blank is rolled, obtains 400MPa grades of valve snail steel.
3. a kind of preparation method of 400MPa grades of valve snail steel according to claim 2, it is characterised in that: the step (3) The pulling rate of middle casting is 2.5~3.5m/s.
4. a kind of preparation method of 400MPa grades of valve snail steel according to claim 2, it is characterised in that: the step (4) Middle rolling include blank heating, roughing, in roll, pre- finish rolling, water cooling, finish rolling cut, water cooling, subtract sizing, water cooling, spinning and air-cooled work Sequence.
5. a kind of preparation method of 400MPa grades of valve snail steel according to claim 4, it is characterised in that: the rolling is opened Rolling temperature is 880~950 DEG C, and final rolling temperature is 850~880 DEG C, and subtracting sizing temperature is 730~760 DEG C, laying temperature 740 ~760 DEG C.
6. a kind of preparation method of 400MPa grades of valve snail steel according to claim 4, it is characterised in that: the air-cooled process Middle blower aperture is 50%~90%, the cover standard-sized sheet.
CN201910732565.1A 2019-08-09 2019-08-09 A kind of 400MPa grades of valve snail steel and preparation method Pending CN110453144A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111763886A (en) * 2020-06-30 2020-10-13 武汉钢铁有限公司 400 MPa-grade hot-rolled spiral shell and production method thereof
CN113684411A (en) * 2021-08-26 2021-11-23 江苏联峰实业有限公司 Method for solving 400 MPa-level Nb-containing steel bar non-yield platform

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106048419A (en) * 2016-07-14 2016-10-26 山西建邦集团有限公司 HRB400E high-strength low alloy coiled reinforced bar and production method thereof

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106048419A (en) * 2016-07-14 2016-10-26 山西建邦集团有限公司 HRB400E high-strength low alloy coiled reinforced bar and production method thereof

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111763886A (en) * 2020-06-30 2020-10-13 武汉钢铁有限公司 400 MPa-grade hot-rolled spiral shell and production method thereof
CN111763886B (en) * 2020-06-30 2022-01-25 武汉钢铁有限公司 400 MPa-grade hot-rolled spiral shell and production method thereof
CN113684411A (en) * 2021-08-26 2021-11-23 江苏联峰实业有限公司 Method for solving 400 MPa-level Nb-containing steel bar non-yield platform

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Application publication date: 20191115