CN114657349A - Preparation method of wind power non-quenched and tempered steel bar suitable for cold machining - Google Patents

Preparation method of wind power non-quenched and tempered steel bar suitable for cold machining Download PDF

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Publication number
CN114657349A
CN114657349A CN202210180034.8A CN202210180034A CN114657349A CN 114657349 A CN114657349 A CN 114657349A CN 202210180034 A CN202210180034 A CN 202210180034A CN 114657349 A CN114657349 A CN 114657349A
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CN
China
Prior art keywords
rolling
temperature
quenched
steel bar
tempered steel
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Pending
Application number
CN202210180034.8A
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Chinese (zh)
Inventor
王莹
周蕾
邓伟
李磊
彭学艺
江雁
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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 CN202210180034.8A priority Critical patent/CN114657349A/en
Publication of CN114657349A publication Critical patent/CN114657349A/en
Pending legal-status Critical Current

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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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/004—Heating the product
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
    • B21B45/0203—Cooling
    • B21B45/0209—Cooling devices, e.g. using gaseous coolants
    • B21B45/0215—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes
    • B21B45/0224—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes for wire, rods, rounds, bars
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/04—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing
    • B21B45/08—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing hydraulically
    • 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
    • C21D8/06—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
    • C21D8/065—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires of ferrous alloys
    • 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
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/0075—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for rods of limited length
    • 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
    • C22C33/06—Making ferrous alloys by melting using master alloys
    • 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
    • C22C38/001—Ferrous alloys, e.g. steel alloys containing N
    • 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
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
    • 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
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
    • 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
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
    • 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
    • C22C38/60—Ferrous alloys, e.g. steel alloys containing lead, selenium, tellurium, or antimony, or more than 0.04% by weight of sulfur

Abstract

The invention discloses a preparation method of a wind power non-quenched and tempered steel bar suitable for cold processing, which comprises the working procedures of rolling heating, rolling dephosphorization, temperature control rolling, temperature control cooling, ultrasonic wave, magnetic flux leakage flaw detection and the like, wherein the requirements of the bar on low-temperature toughness and obdurability are met by adjusting the content of a component C in the components, the strength of the bar is ensured by adding alloys such as Cr, Mo and the like, vanadium nitrogen and aluminum nitride refined grains, and the strength is improved by a low-temperature final rolling and water passing mode after rolling.

Description

Preparation method of wind power non-quenched and tempered steel bar suitable for cold machining
Technical Field
The invention relates to the field of metallurgy, in particular to a preparation method of a wind power non-quenched and tempered steel bar suitable for cold machining.
Background
At present, parts of a wind turbine generator set are mostly made of quenched and tempered steel, and the frequency of deformation and cracking after heat treatment in the preparation process is high, so that the construction of a wind tower is seriously influenced. And the cost of the quenching and tempering heat treatment is higher. The conventional non-quenched and tempered steel only requires normal-temperature impact energy, and does not relate to the low-temperature impact energy performance of round steel at the temperature of minus 30 ℃.
In patent publication No. CN104651753A non-quenched and tempered steel for a balance shaft of a heavy-duty car and a manufacturing method thereof, the composition of the non-quenched and tempered steel comprises Mn: 1.50-2.30%, and the longitudinal impact at the normal temperature of 20 ℃ is more than or equal to 50J, and the low-temperature impact power at the temperature of-30 ℃ is still not controlled.
In the patent of CN109234627A patent of non-quenched and tempered round steel with high strength and high toughness and preparation method thereof, the components comprise C: 0.27-0.33%, no requirement is made on Ni element, the normal temperature longitudinal impact is more than or equal to 190J, and the low temperature impact energy at minus 30 ℃ is still not controlled.
Disclosure of Invention
The purpose of the invention is as follows: the invention aims to provide a preparation method of a wind power non-quenched and tempered steel bar suitable for cold machining, which can be used for wind power generator parts under severe conditions.
The technical scheme is as follows: the invention relates to a preparation method of a wind power non-quenched and tempered steel bar suitable for cold machining, which comprises the following components in percentage by weight: 0.15 to 0.25%, Mn: 1.20 to 1.50%, Si: 0.20-0.50%, P is less than or equal to 0.035%, S: 0.020 to 0.060%, Cr: less than or equal to 0.35 percent, Ni: 0.08-0.35%, Al: 0.010-0.040%, Mo: less than or equal to 0.10 percent, V: 0.06-0.20%, N: 0.005-0.020%, and the balance of Fe and inevitable impurities.
In the technical scheme, the requirements of the bar on low-temperature toughness and toughness are met by adjusting the content of the component C, and the strength of the bar is ensured by adding alloys such as Cr, Mo and the like, vanadium nitrogen and aluminum nitride refined grains.
Preferably, the method comprises the steps of:
(1) rolling and heating: the heating temperature is 950-1200 ℃, and the total heating time is more than or equal to 200 min;
(2) rolling and removing phosphorus: removing phosphorus by adopting high-pressure water, wherein the pressure is more than or equal to 13 MPa;
(3) temperature control rolling: the initial rolling temperature is more than or equal to 960 ℃;
(4) temperature control and cooling: after rolling, the steel is quickly cooled by passing through water, the temperature of an upper cooling bed is less than 780 ℃, the upper cooling bed is uniformly cooled, and the temperature of a lower cooling bed pile is less than 450 ℃.
In this method, the strength is improved by low-temperature finish rolling and water penetration after rolling.
Preferably, the cooled bar is finally inspected by means of ultrasonic inspection and magnetic flux leakage inspection.
Preferably, in the step (3), a KOCKS rolling mill is adopted to control the finishing temperature to be below 880 ℃, so as to realize continuous temperature-controlled rolling.
Preferably, the bar prepared by the method has the tensile strength Rm of 650-850 MPa, the yield strength Rp0.2 of more than or equal to 500MPa, the elongation A% of more than or equal to 15%, the low-temperature impact energy KV2(-30 ℃), of more than or equal to 80J and the hardness of 200-260 HBW.
Has the advantages that: compared with the prior art, the invention has the advantages that: the bar prepared by the method has high strength, can meet the requirements of customers in the wind power industry on low-temperature toughness, and has good performance after being processed into wind turbine generator parts.
Drawings
Fig. 1 is a metallographic structure diagram (× 200) of the surface of the bar prepared in this example;
fig. 2 is a metallographic structure diagram (. 200) at 1/2R of the bar;
FIG. 3 is a metallographic structure diagram of the core of a bar (. 200);
fig. 4 is a schematic representation of the austenite grain size of the rods (× 200).
Detailed Description
The technical scheme of the invention is further explained by combining the attached drawings.
Example (b): the embodiment is a non-quenched and tempered steel bar for wind power with the specification of phi 20-80 mm, and the concrete components are as follows:
C Si Mn P S Cr Al Mo V N
0.21 0.40 1.40 0.011 0.032 0.15 0.020 0.03 0.10 0.0010
the preparation method comprises the following steps:
(1) heating and rolling at 950-1200 ℃, wherein the total heating time is more than or equal to 200 min;
(2) removing phosphorus by adopting high-pressure water, wherein the pressure is more than or equal to 13 MPa;
(3) the rolling initial rolling temperature is more than or equal to 960 ℃, and the final rolling temperature is controlled below 880 ℃ by adopting a KOCKS rolling mill, so that continuous temperature control rolling is realized;
(4) after rolling, rapidly cooling by passing through water, wherein the temperature of an upper cooling bed is less than 780 ℃, the upper cooling bed is uniformly cooled, and the temperature of a lower cooling bed is less than 450 ℃ for heap cooling;
(5) the ultrasonic flaw detection and the magnetic flux leakage flaw detection are adopted for detection, the ultrasonic flaw detection precision meets the A-grade requirement of GB/T4162, and the depth of the surface defect is less than or equal to 0.30 mm.
The bar prepared according to the above embodiment is selected for detection, and the detection result is as follows: tensile strength Rm: 750MPa, yield strength Rp0.2:600MPa, elongation A%: 20 percent, low-temperature impact energy KV2(-30 ℃): 96J, the hardness is 228HBW, the surface structure is a fine tempered sorbite structure, and the half-radius and core structure is ferrite and pearlite, which are shown in figures 1-3. Austenite grain size grade 7.0, see fig. 4.

Claims (6)

1. The preparation method of the wind power non-quenched and tempered steel bar suitable for cold machining is characterized in that the non-quenched and tempered steel bar comprises the following components in percentage by weight: 0.15 to 0.25%, Mn: 1.20 to 1.50%, Si: 0.20-0.50%, P is less than or equal to 0.035%, S: 0.020 to 0.060%, Cr: less than or equal to 0.35 percent, Ni: 0.08-0.35%, Al: 0.010-0.040%, Mo: less than or equal to 0.10 percent, V: 0.06-0.20%, N: 0.005-0.020%, and the balance of Fe and inevitable impurities.
2. The method of making a wind powered non-quenched and tempered steel bar suitable for cold working of claim 1, comprising the steps of:
(1) rolling and heating: the heating temperature is 950-1200 ℃, and the total heating time is more than or equal to 200 min;
(2) rolling and removing phosphorus: removing phosphorus by adopting high-pressure water, wherein the pressure is more than or equal to 13 MPa;
(3) temperature control rolling: the initial rolling temperature is more than or equal to 960 ℃;
(4) temperature control and cooling: after rolling, the steel is quickly cooled by passing through water, the temperature of an upper cooling bed is less than 780 ℃, the upper cooling bed is uniformly cooled, and the temperature of a lower cooling bed pile is less than 450 ℃.
3. The method for preparing the wind-powered non-quenched and tempered steel bar suitable for cold working according to claim 2, wherein the cooled bar is detected by means of ultrasonic flaw detection and magnetic flux leakage flaw detection.
4. The method for preparing the wind power non-quenched and tempered steel bar suitable for cold working according to claim 3, wherein the ultrasonic flaw detection precision meets the A-grade requirement of GB/T4162, and the depth of the surface defect is less than or equal to 0.30 mm.
5. The method for preparing the wind-powered non-quenched and tempered steel bar suitable for cold working according to claim 2, wherein in the step (3), a KOCKS rolling mill is adopted to control the final rolling temperature to be below 880 ℃, so that continuous temperature-controlled rolling is realized.
6. The preparation method of the wind power non-quenched and tempered steel bar suitable for cold processing according to claim 2, wherein the bar prepared by the method has the tensile strength Rm of 650-850 MPa, the yield strength Rp0.2 of 500MPa or more, the elongation A% of 15% or more, the low-temperature impact energy KV2(-30 ℃), of 80J or more, and the hardness of 200-260 HBW.
CN202210180034.8A 2022-02-25 2022-02-25 Preparation method of wind power non-quenched and tempered steel bar suitable for cold machining Pending CN114657349A (en)

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CN202210180034.8A CN114657349A (en) 2022-02-25 2022-02-25 Preparation method of wind power non-quenched and tempered steel bar suitable for cold machining

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CN114657349A true CN114657349A (en) 2022-06-24

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011246784A (en) * 2010-05-28 2011-12-08 Jfe Steel Corp Rolled non-heat treated steel bar having excellent strength and toughness and method for producing the same
CN114058944A (en) * 2021-09-17 2022-02-18 大冶特殊钢有限公司 Q500 steel grade low-alloy structural steel bar and controlled rolling and controlled cooling rolling method thereof

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011246784A (en) * 2010-05-28 2011-12-08 Jfe Steel Corp Rolled non-heat treated steel bar having excellent strength and toughness and method for producing the same
CN114058944A (en) * 2021-09-17 2022-02-18 大冶特殊钢有限公司 Q500 steel grade low-alloy structural steel bar and controlled rolling and controlled cooling rolling method thereof

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Application publication date: 20220624