CN113186450A - Non-quenched and tempered steel weather-resistant high-strength bolt and manufacturing method thereof - Google Patents

Non-quenched and tempered steel weather-resistant high-strength bolt and manufacturing method thereof Download PDF

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Publication number
CN113186450A
CN113186450A CN202110323387.4A CN202110323387A CN113186450A CN 113186450 A CN113186450 A CN 113186450A CN 202110323387 A CN202110323387 A CN 202110323387A CN 113186450 A CN113186450 A CN 113186450A
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China
Prior art keywords
quenched
tempered steel
equal
less
resistant high
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Inventor
刘磊
周蕾
陆恒昌
赵秀明
邓伟
刘文学
钱鹏
张波
王杨
袁峰
王晓勤
董瀚
鲍玉坤
胡春东
吴萌
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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 CN202110323387.4A priority Critical patent/CN113186450A/en
Publication of CN113186450A publication Critical patent/CN113186450A/en
Priority to PCT/CN2021/135205 priority patent/WO2022199113A1/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
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21H—MAKING PARTICULAR METAL OBJECTS BY ROLLING, e.g. SCREWS, WHEELS, RINGS, BARRELS, BALLS
    • B21H3/00—Making helical bodies or bodies having parts of helical shape
    • B21H3/02—Making helical bodies or bodies having parts of helical shape external screw-threads ; Making dies for thread rolling
    • B21H3/04—Making by means of profiled-rolls or die rolls
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
    • B21K1/00—Making machine elements
    • B21K1/44—Making machine elements bolts, studs, or the like
    • 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
    • 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
    • C21D6/004—Heat treatment of ferrous alloys containing Cr and 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
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/005—Heat treatment of ferrous alloys containing Mn
    • 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
    • C21D6/008—Heat treatment of ferrous alloys containing Si
    • 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
    • C21D8/005—Modifying the physical properties by deformation combined with, or followed by, heat treatment 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
    • C21D9/0093—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for screws; for bolts
    • 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
    • C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
    • 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
    • C22C38/06—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
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
    • 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
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
    • 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
    • C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
    • 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
    • C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese

Abstract

The invention discloses a non-quenched and tempered steel weather-resistant high-strength bolt which comprises the following chemical components in percentage by mass: c: 0.17 to 0.23; si is less than or equal to 0.30; mn: 1.25 to 1.60; p is less than or equal to 0.02; s is less than or equal to 0.015; cr: 0.4 to 0.6; ni is less than or equal to 0.3; v is less than or equal to 0.08; nb is less than or equal to 0.05; ti is less than or equal to 0.04; cu: 0.37 to 0.41; al: 0.01-0.035; n: 0.006-0.012; o is less than or equal to 0.0015, and the balance of Fe and inevitable impurities; the tensile strength of the M6 bolt prepared by the invention is more than or equal to 810MPa, the elongation after fracture is more than or equal to 10 percent, and the reduction of area is more than or equal to 55 percent, and the invention has the technical effects of high tensile strength, good ductility and toughness and excellent atmospheric corrosion resistance.

Description

Non-quenched and tempered steel weather-resistant high-strength bolt and manufacturing method thereof
Technical Field
The invention relates to a non-quenched and tempered steel weather-resistant high-strength bolt, in particular to an economical high-strength bolt resistant to atmospheric corrosion and a manufacturing method thereof.
Background
In the manufacturing process of the high-strength bolt, spheroidizing annealing and thermal refining both belong to heat treatment processes with long period and high energy consumption, so more and more people adopt non-thermal-refining steel to produce the bolt. The existing non-quenched and tempered steel bolt has a series of advantages of saving energy consumption of heat treatment, reducing pollution to the environment, avoiding waste products caused by deformation or quenching cracks in the heat treatment process and improving the utilization rate of materials, and is widely applied.
However, the improvement of the atmospheric corrosion resistance of the non-quenched and tempered steel bolt in the using process has obvious defects.
Disclosure of Invention
The purpose of the invention is as follows: the invention aims to provide a non-quenched and tempered steel weather-resistant high-strength bolt, and solves the problem that the non-quenched and tempered steel bolt in the prior art is insufficient in atmospheric corrosion resistance.
The technical scheme is as follows: the non-quenched and tempered steel weather-resistant high-strength bolt comprises the following chemical components in percentage by mass: c: 0.17 to 0.23; si is less than or equal to 0.30; mn: 1.25 to 1.60; p is less than or equal to 0.02; s is less than or equal to 0.015; cr: 0.4 to 0.6; ni is less than or equal to 0.3; v is less than or equal to 0.08; nb is less than or equal to 0.05; ti is less than or equal to 0.04; cu: 0.37 to 0.41; al: 0.01-0.035; n: 0.006-0.012; o is less than or equal to 0.0015, and the balance is Fe and inevitable impurities.
Further, the non-quenched and tempered steel weather-resistant high-strength bolt comprises the following chemical components in percentage by mass: c: 0.223; si: 0.276; mn: 1.60; p: 0.0177; 0.0058 percent of S; cr: 0.58; ni: 0.2; v: 0.042; nb: 0.042; ti: 0.033; cu: 0.37; al: 0.030; n: 0.010; o: 0.0010, and the balance of Fe and inevitable impurities.
Further, the non-quenched and tempered steel weather-resistant high-strength bolt comprises the following chemical components in percentage by mass: c: 0.218; si: 0.263; mn: 1.54; p: 0.017; s is 0.006; cr: 0.50; ni: 0.25; v: 0.045; nb: 0.045; ti: 0.037; cu: 0.39; al: 0.028; n: 0.01; o: 0.0014, and the balance of Fe and inevitable impurities.
Further, the non-quenched and tempered steel weather-resistant high-strength bolt comprises the following chemical components in percentage by mass: c: 0.176; si: 0.13; mn: 1.28; p: 0.014; s is 0.003; cr: 0.48; ni: 0.28; v: 0.034; nb: 0.023; ti: 0.012; cu: 0.40; al: 0.018; n: 0.0064; o: 0.0012, and the balance of Fe and inevitable impurities.
Further, the non-quenched and tempered steel weather-resistant high-strength bolt comprises the following chemical components in percentage by mass: c: 0.174; si: 0.123; mn: 1.22; p: 0.013; s is 0.003; cr: 0.45 of; ni: 0.30; v: 0.032; nb: 0.0177; ti: 0.018; cu: 0.0.41, respectively; al: 0.012; n: 0.0068; o: 0.0013, and the balance of Fe and inevitable impurities.
A manufacturing method of a non-quenched and tempered steel weather-resistant high-strength bolt comprises the following steps:
the method comprises the following steps: drawing the non-quenched and tempered steel wire;
step two: cold heading;
step three: rolling threads;
step four: surface treatment;
step five: and (5) aging treatment.
Further, the drawing process includes the steps of: selecting a non-quenched and tempered steel wire with the diameter phi of 7mm to 8mm, drawing to phi of 5.92mm under the tensile strength of 650MPa to 820MPa, wherein the drawing reduction ratio is 28.5 percent to 45 percent, and the tensile strength is 770MPa to 820 MPa.
Further, the aging treatment comprises the following steps: the heating temperature is 210-318 ℃, the heat preservation time is 120-166 minutes, the material is discharged from the furnace and air-cooled, the tensile strength of the M6 bolt is 825MPa-870MPa, and the reduction of area is 57.6-63.5%.
Has the advantages that: compared with the prior art, the invention has the following remarkable advantages: has the effects of high tensile strength, good ductility and toughness and excellent atmospheric corrosion resistance.
Detailed Description
The technical scheme of the invention is further explained by combining the attached drawings.
The non-quenched and tempered steel weather-resistant high-strength bolt comprises the following chemical components in percentage by mass: c: 0.17 to 0.23; si is less than or equal to 0.30; mn: 1.25 to 1.60; p is less than or equal to 0.02; s is less than or equal to 0.015; cr: 0.4 to 0.6; ni is less than or equal to 0.3; v is less than or equal to 0.08; nb is less than or equal to 0.05; ti is less than or equal to 0.04; cu: 0.37 to 0.41; al: 0.01-0.035; n: 0.006-0.012; o is less than or equal to 0.0015, and the balance is Fe and inevitable impurities.
Example 1
The non-quenched and tempered steel weather-resistant high-strength bolt and the manufacturing method thereof comprise the following main process flows of drawing, cold heading, thread rolling, surface treatment and aging treatment, and the bolt comprises the following chemical components in percentage by mass: c: 0.223; si: 0.276; mn: 1.60; p: 0.0177; 0.0058 percent of S; cr: 0.58; ni: 0.2; v: 0.042; nb: 0.042; ti: 0.033; cu: 0.37; al: 0.030; n: 0.010; o: 0.0010, and the balance of Fe and inevitable impurities.
Example 2
The non-quenched and tempered steel weather-resistant high-strength bolt and the manufacturing method thereof comprise the following process flows of drawing, cold heading, thread rolling, surface treatment and aging treatment, and the non-quenched and tempered steel weather-resistant high-strength bolt comprises the following chemical components in percentage by mass: c: 0.218; si: 0.263; mn: 1.54; p: 0.017; s is 0.006; cr: 0.50; ni: 0.25; v: 0.045; nb: 0.045; ti: 0.037; cu: 0.39; al: 0.028; n: 0.01; o: 0.0014, and the balance of Fe and inevitable impurities.
Example 3
The non-quenched and tempered steel weather-resistant high-strength bolt and the manufacturing method thereof comprise the following process flows of drawing, cold heading, thread rolling, surface treatment and aging treatment, and the non-quenched and tempered steel weather-resistant high-strength bolt comprises the following chemical components in percentage by mass: c: 0.176; si: 0.13; mn: 1.28; p: 0.014; s is 0.003; cr: 0.48; ni: 0.28; v: 0.034; nb: 0.023; ti: 0.012; cu: 0.40; al: 0.018; n: 0.0064; o: 0.0012, and the balance of Fe and inevitable impurities.
Example 4
The non-quenched and tempered steel weather-resistant high-strength bolt and the manufacturing method thereof comprise the following process flows of drawing, cold heading, thread rolling, surface treatment and aging treatment, and the non-quenched and tempered steel weather-resistant high-strength bolt comprises the following chemical components in percentage by mass: c: 0.174; si: 0.123; mn: 1.22; p: 0.013; s is 0.003; cr: 0.45 of; ni: 0.30; v: 0.032; nb: 0.0177; ti: 0.018; cu: 0.0.41, respectively; al: 0.012; n: 0.0068; o: 0.0013, and the balance of Fe and inevitable impurities.
The manufacturing method of the non-quenched and tempered steel weather-resistant high-strength bolt further comprises the following steps:
the method comprises the following steps: drawing the non-quenched and tempered steel wire;
step two: cold heading;
step three: rolling threads;
step four: surface treatment;
step five: and (5) aging treatment.
The drawing process comprises the following steps: selecting a non-quenched and tempered steel wire with the diameter phi of 7mm to 8mm, drawing to phi of 5.92mm under the tensile strength of 650MPa to 820MPa, wherein the drawing reduction ratio is 28.5 percent to 45 percent, and the tensile strength is 770MPa to 820 MPa. The aging treatment comprises the following steps: the heating temperature is 210-318 ℃, the heat preservation time is 120-166 minutes, the material is discharged from the furnace and air-cooled, the tensile strength of the M6 bolt is 825MPa-870MPa, and the reduction of area is 57.6-63.5%.
Example 5
The drawing process mainly comprises: selecting a non-quenched and tempered steel wire rod with the diameter phi of 7mm, drawing to phi 5.92mm under the condition of tensile strength of 650MPa, drawing reduction ratio of 28.5 percent and tensile strength of 770 MPa; the aging treatment mainly comprises the following steps: heating at 210 ℃, keeping the temperature for 120 minutes, discharging from the furnace and air-cooling, wherein the tensile strength of the M6 bolt is 825MPa, and the reduction of area is 63%.
Example 6
The drawing process mainly comprises: selecting a non-quenched and tempered steel wire rod with the diameter phi of 7mm, drawing to phi 5.92mm under the condition of tensile strength of 650MPa, drawing reduction ratio of 28.5 percent and tensile strength of 770 MPa; the aging treatment mainly comprises the following steps: heating at 300 deg.C for 130 min, cooling, M6 bolt tensile strength 834MPa, section shrinkage 63.5%,
example 7
The drawing process mainly comprises: selecting a non-quenched and tempered steel wire rod with the diameter phi of 8mm, wherein the tensile strength is 666MPa, the drawing is carried out until the diameter phi is 5.92mm, the drawing reduction rate is 45 percent, and the tensile strength is 820 MPa; the aging treatment mainly comprises the following steps: heating temperature is 280 ℃, heat preservation time is 145 minutes, discharging from the furnace and air cooling, tensile strength of M6 bolt is 865MPa, and reduction of area is 57.6%.
Example 8
The drawing process mainly comprises: selecting a non-quenched and tempered steel wire rod with the diameter phi of 8mm, wherein the tensile strength is 666MPa, the drawing is carried out until the diameter phi is 5.92mm, the drawing reduction rate is 45 percent, and the tensile strength is 820 MPa; the aging treatment mainly comprises the following steps: the heating temperature is 318 ℃, the heat preservation time is 166 minutes, the material is discharged from the furnace and cooled in air, the tensile strength of the M6 bolt is 870MPa, and the reduction of area is 61.2%.

Claims (8)

1. The non-quenched and tempered steel weather-resistant high-strength bolt is characterized by comprising the following chemical components in percentage by mass: c: 0.17 to 0.23; si is less than or equal to 0.30; mn: 1.25 to 1.60; p is less than or equal to 0.02; s is less than or equal to 0.015; cr: 0.4 to 0.6; ni is less than or equal to 0.3; v is less than or equal to 0.08; nb is less than or equal to 0.05; ti is less than or equal to 0.04; cu: 0.37 to 0.41; al: 0.01-0.035; n: 0.006-0.012; o is less than or equal to 0.0015, and the balance is Fe and inevitable impurities.
2. The non-quenched and tempered steel weather-resistant high-strength bolt according to claim 1, wherein: the non-quenched and tempered steel weather-resistant high-strength bolt comprises the following chemical components in percentage by mass: c: 0.223; si: 0.276; mn: 1.60; p: 0.0177; 0.0058 percent of S; cr: 0.58; ni: 0.2; v: 0.042; nb: 0.042; ti: 0.033; cu: 0.37; al: 0.030; n: 0.010; o: 0.0010, and the balance of Fe and inevitable impurities.
3. The non-quenched and tempered steel weather-resistant high-strength bolt according to claim 1, wherein: the non-quenched and tempered steel weather-resistant high-strength bolt comprises the following chemical components in percentage by mass: c: 0.218; si: 0.263; mn: 1.54; p: 0.017; s is 0.006; cr: 0.50; ni: 0.25; v: 0.045; nb: 0.045; ti: 0.037; cu: 0.39; al: 0.028; n: 0.01; o: 0.0014, and the balance of Fe and inevitable impurities.
4. The non-quenched and tempered steel weather-resistant high-strength bolt according to claim 1, wherein: the non-quenched and tempered steel weather-resistant high-strength bolt comprises the following chemical components in percentage by mass: c: 0.176; si: 0.13; mn: 1.28; p: 0.014; s is 0.003; cr: 0.48; ni: 0.28; v: 0.034; nb: 0.023; ti: 0.012; cu: 0.40; al: 0.018; n: 0.0064; o: 0.0012, and the balance of Fe and inevitable impurities.
5. The non-quenched and tempered steel weather-resistant high-strength bolt according to claim 1, wherein: the non-quenched and tempered steel weather-resistant high-strength bolt comprises the following chemical components in percentage by mass: c: 0.174; si: 0.123; mn: 1.22; p: 0.013; s is 0.003; cr: 0.45 of; ni: 0.30; v: 0.032; nb: 0.0177; ti: 0.018; cu: 0.0.41, respectively; al: 0.012; n: 0.0068; o: 0.0013, and the balance of Fe and inevitable impurities.
6. A manufacturing method of a non-quenched and tempered steel weather-resistant high-strength bolt is characterized by comprising the following steps: the method comprises the following steps:
the method comprises the following steps: drawing the non-quenched and tempered steel wire;
step two: cold heading;
step three: rolling threads;
step four: surface treatment;
step five: and (5) aging treatment.
7. The method for manufacturing a non-quenched and tempered steel weather-resistant high-strength bolt according to claim 5, wherein: the drawing process comprises the following steps: selecting a non-quenched and tempered steel wire with the diameter phi of 7mm to 8mm, drawing to phi of 5.92mm under the tensile strength of 650MPa to 820MPa, wherein the drawing reduction ratio is 28.5 percent to 45 percent, and the tensile strength is 770MPa to 820 MPa.
8. The method for manufacturing a non-quenched and tempered steel weather-resistant high-strength bolt according to claim 6, wherein: the aging treatment comprises the following steps: the heating temperature is 210-318 ℃, the heat preservation time is 120-166 minutes, the material is discharged from the furnace and air-cooled, the tensile strength of the M6 bolt is 825MPa-870MPa, and the reduction of area is 57.6-63.5%.
CN202110323387.4A 2021-03-26 2021-03-26 Non-quenched and tempered steel weather-resistant high-strength bolt and manufacturing method thereof Pending CN113186450A (en)

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CN202110323387.4A CN113186450A (en) 2021-03-26 2021-03-26 Non-quenched and tempered steel weather-resistant high-strength bolt and manufacturing method thereof
PCT/CN2021/135205 WO2022199113A1 (en) 2021-03-26 2021-12-03 Non-quenched and tempered steel weather-resistant high-strength bolt, and manufacturing method therefor

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022199113A1 (en) * 2021-03-26 2022-09-29 南京钢铁股份有限公司 Non-quenched and tempered steel weather-resistant high-strength bolt, and manufacturing method therefor

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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