CN112359192A - Heat treatment process of high-strength corrosion-resistant bolt - Google Patents

Heat treatment process of high-strength corrosion-resistant bolt Download PDF

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Publication number
CN112359192A
CN112359192A CN202011152524.4A CN202011152524A CN112359192A CN 112359192 A CN112359192 A CN 112359192A CN 202011152524 A CN202011152524 A CN 202011152524A CN 112359192 A CN112359192 A CN 112359192A
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China
Prior art keywords
bolt
heat treatment
treatment process
temperature
impurities
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Pending
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CN202011152524.4A
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Chinese (zh)
Inventor
黄忠议
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Taicang Taibiao Auto Parts Co ltd
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Taicang Taibiao Auto Parts Co ltd
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Priority to CN202011152524.4A priority Critical patent/CN112359192A/en
Publication of CN112359192A publication Critical patent/CN112359192A/en
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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
    • C21D9/00Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/0093Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for screws; for bolts
    • 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
    • C21D1/00General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/18Hardening; Quenching with or without subsequent tempering
    • 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
    • C21D1/00General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/74Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
    • 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
    • C21D6/00Heat treatment of ferrous alloys
    • C21D6/002Heat treatment of ferrous alloys containing Cr
    • 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
    • C21D6/00Heat treatment of ferrous alloys
    • C21D6/008Heat treatment of ferrous alloys containing Si
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/002Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
    • 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
    • C22C38/18Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/22Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/18Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/24Ferrous alloys, e.g. steel alloys containing chromium with vanadium
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/18Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/26Ferrous alloys, e.g. steel alloys containing chromium with niobium or tantalum
    • CCHEMISTRY; METALLURGY
    • C23COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23GCLEANING OR DEGREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
    • C23G1/00Cleaning or pickling metallic material with solutions or molten salts
    • C23G1/14Cleaning or pickling metallic material with solutions or molten salts with alkaline solutions
    • C23G1/19Iron or steel

Abstract

The invention provides a heat treatment process of a high-strength corrosion-resistant bolt, belonging to the technical field of bolt processing, and comprising the following processing steps: (1) heating: introducing a certain amount of mixed gas of methanol and propane into the heating furnace, heating the heating furnace to 800 ℃, and preserving heat for 2 hours at the temperature; (2) tempering: reducing the temperature in the heating furnace to 700 ℃ at a cooling speed of 15-20 ℃/h, and preserving the heat for 7-8h at the temperature; (3) high-temperature quenching: then quenching in mineral oil at 500 ℃; (4) and (3) cooling: taking out the bolt obtained in the step (3), and placing the bolt in water at the temperature of 20-35 ℃ for cooling; (5) oil removal: and (4) placing the bolt obtained in the step (4) into an oil removal agent for oil removal. The heat treatment process of the high-strength corrosion-resistant bolt can carry out heat treatment on the bolt, so that the bolt after heat treatment has higher strength and keeps better corrosion resistance, and the quality of the bolt is improved.

Description

Heat treatment process of high-strength corrosion-resistant bolt
Technical Field
The invention belongs to the technical field of bolt processing, and particularly relates to a heat treatment process of a high-strength corrosion-resistant bolt.
Background
A bolt is a mechanical part commonly used for cylindrical threaded fasteners with nuts. In the process of processing automobile parts, bolts with various sizes are inevitably needed to be used for fixing, and because the quality requirements of the automobile parts are stricter and stricter at present, the bolts used as fastening parts also need to have higher strength and still can keep better fastening capability after long-term friction with other parts. And because the driving environment of car is various, and a lot of bolts all expose outside, these bolts contact with multiple environment for a long time, need it to have better corrosion resisting property to improve its life.
Disclosure of Invention
In order to solve the technical problems, the invention provides a heat treatment process for a high-strength corrosion-resistant bolt, which can carry out heat treatment on the bolt, so that the bolt after heat treatment has higher strength and keeps better corrosion resistance, and the quality of the bolt is improved.
In order to achieve the purpose, the invention is realized by the following technical scheme: a heat treatment process of a high-strength corrosion-resistant bolt comprises the following processing steps:
(1) heating: placing the bolt to be treated in a heating furnace, introducing a certain amount of mixed gas of methanol and propane, heating the heating furnace to 800 ℃, and preserving heat for 2 hours at the temperature;
(2) tempering: reducing the temperature in the heating furnace to 700 ℃ at a cooling speed of 15-20 ℃/h, and preserving the heat for 7-8h at the temperature;
(3) high-temperature quenching: then putting the bolt in mineral oil at 500 ℃ for quenching for 1 h;
(4) and (3) cooling: taking out the bolt obtained in the step (3), and placing the bolt in water at the temperature of 20-35 ℃ for cooling;
(5) oil removal: and (4) placing the bolt obtained in the step (4) into an oil removing agent for oil removal, wherein the temperature of the oil removing agent is 65-85 ℃, and then drying after cleaning the surface with hot water. The carbon potential generated by cracking the mixed gas of methanol and propane at high temperature is introduced into the heating furnace, so that the bolt can be heated and protected, and the metal surface is prevented from being oxidized; high-temperature oil quenching is adopted firstly, so that the problem that the hardness of the bolt is influenced by metal cracking in the bolt due to direct water quenching can be avoided, and the uniformity in the bolt can be kept.
Further, the volume ratio of the methanol to the propane is 1-1.5: 1-2.
Further, the oil removing agent comprises the following components in parts by weight: 65-80 parts of sodium carbonate, 25-40 parts of disodium hydrogen phosphate, 15-25 parts of sodium silicate, 5-10 parts of fatty alcohol-polyoxyethylene ether and 50-85 parts of deionized water.
Further, the bolt comprises the following components in proportion: 15-25% of chromium, 10-15% of cadmium, 5-10% of molybdenum, 1-3% of tungsten, 0.5-1.5% of vanadium, 0.1-0.3% of silicon, 0.01-0.03% of niobium and the balance of iron and inevitable impurities, wherein the content of the impurities is not more than 0.1%. Chromium has higher hardness and better corrosion resistance, cadmium has better corrosion resistance, molybdenum and tungsten have higher hardness, vanadium has stronger hardness and better corrosion resistance, silicon is used as a reducing agent and a deoxidizing agent to improve the strength of the bolt, and niobium ensures that the bolt has better ductility and is convenient to process while keeping the hardness; the combination of these elements can provide the bolt with higher strength and better corrosion resistance.
Further, the bolt comprises the following components in proportion: 20-25% of chromium, 12-15% of cadmium, 5-10% of molybdenum, 1-3% of tungsten, 0.5-1.5% of vanadium, 0.1-0.3% of silicon, 0.01-0.03% of niobium and the balance of iron and inevitable impurities, wherein the content of the impurities is not more than 0.08%.
Further, the bolt comprises the following components in proportion: 20-25% of chromium, 10% of cadmium, 5-10% of molybdenum, 1-3% of tungsten, 0.5-1.5% of vanadium, 0.1-0.3% of silicon, 0.01-0.03% of niobium and the balance of iron and inevitable impurities, wherein the content of the impurities is not more than 0.08%.
Further, the bolt comprises the following components in proportion: 15-25% of chromium, 15% of cadmium, 5-10% of molybdenum, 1-3% of tungsten, 1.5% of vanadium, 0.1-0.3% of silicon, 0.01-0.03% of niobium, and the balance of iron and inevitable impurities, wherein the content of the impurities is not more than 0.08%.
Further, the content of phosphorus in the impurities is not more than 0.03%. An appropriate amount of phosphorus enhances the cold shortness of the steel, but an excess amount reduces its workability.
Further, the content of sulfur in the impurities is not more than 0.035%. An appropriate amount of sulfur improves the workability of steel, but an excessive amount of sulfur reduces the corrosion resistance and makes the surface of steel easily cracked.
Has the advantages that: compared with the prior art, the invention has the following advantages: according to the heat treatment process for the high-strength corrosion-resistant bolt, provided by the invention, the bolt can be subjected to heat treatment, so that the bolt subjected to heat treatment has higher strength, and the quality of the bolt is improved; the carbon potential generated by cracking the mixed gas of methanol and propane at high temperature is introduced into the heating furnace, so that the bolt can be heated and protected, and the metal surface is prevented from being oxidized; high-temperature oil quenching is adopted firstly, so that the influence on the hardness of the bolt due to metal cracking in the bolt caused by direct water quenching can be avoided, and the uniformity in the bolt can be kept; the raw material of the bolt comprises various metal materials, so that the bolt has high strength and hardness and good corrosion resistance.
Detailed Description
The invention will now be further illustrated by reference to the following specific examples.
Example 1
A high-strength corrosion-resistant bolt comprises the following components in parts by weight: 15% of chromium, 10% of cadmium, 5% of molybdenum, 1% of tungsten, 0.5% of vanadium, 0.1% of silicon, 0.01% of niobium, and the balance of iron and inevitable impurities, wherein the content of the impurities is not more than 0.1%.
Example 2
A high-strength corrosion-resistant bolt comprises the following components in parts by weight: 25% of chromium, 15% of cadmium, 10% of molybdenum, 3% of tungsten, 1.5% of vanadium, 0.3% of silicon, 0.03% of niobium, and the balance of iron and inevitable impurities, wherein the content of the impurities is not more than 0.08%, the content of phosphorus in the impurities is not more than 0.03%, and the content of sulfur in the impurities is not more than 0.035%.
Example 3
A high-strength corrosion-resistant bolt comprises the following components in parts by weight: 20% of chromium, 12% of cadmium, 7% of molybdenum, 2% of tungsten, 1% of vanadium, 0.2% of silicon, 0.02% of niobium, and the balance of iron and inevitable impurities, wherein the content of the impurities is not more than 0.08%, the content of phosphorus in the impurities is not more than 0.03%, and the content of sulfur in the impurities is not more than 0.035%.
Example 4
The bolt of example 1 was subjected to a heat treatment process comprising the following processing steps:
(1) heating: placing the bolt to be treated in a heating furnace, introducing a certain amount of mixed gas of methanol and propane with the volume ratio of 1:1, heating the heating furnace to 800 ℃, and preserving heat for 2 hours at the temperature;
(2) tempering: reducing the temperature in the heating furnace to 700 ℃ at a cooling speed of 15 ℃/h, and preserving the heat for 7h at the temperature;
(3) high-temperature quenching: then putting the bolt in mineral oil at 500 ℃ for quenching for 1 h;
(4) and (3) cooling: taking out the bolt obtained in the step (3), and placing the bolt in water at the temperature of 20 ℃ for cooling;
(5) oil removal: and (4) placing the bolt obtained in the step (4) into an oil removal agent for oil removal, wherein the oil removal agent comprises the following components in parts by weight: 65 parts of sodium carbonate, 25 parts of disodium hydrogen phosphate, 15 parts of sodium silicate, 5 parts of fatty alcohol-polyoxyethylene ether and 50 parts of deionized water, wherein the temperature of the degreasing agent is 65 ℃, and then the surface of the degreasing agent is cleaned by hot water and dried.
Example 5
The bolt of example 1 was subjected to a heat treatment process comprising the following processing steps:
(1) heating: placing the bolt to be treated in a heating furnace, introducing a certain amount of mixed gas of methanol and propane in a volume ratio of 1.5:2, heating the heating furnace to 800 ℃, and preserving heat for 2 hours at the temperature;
(2) tempering: reducing the temperature in the heating furnace to 700 ℃ at a cooling speed of 20 ℃/h, and preserving the heat for 8h at the temperature;
(3) high-temperature quenching: then putting the bolt in mineral oil at 500 ℃ for quenching for 1 h;
(4) and (3) cooling: taking out the bolt obtained in the step (3), and placing the bolt in water at 35 ℃ for cooling;
(5) oil removal: and (4) placing the bolt obtained in the step (4) into an oil removal agent for oil removal, wherein the oil removal agent comprises the following components in parts by weight: 80 parts of sodium carbonate, 40 parts of disodium hydrogen phosphate, 25 parts of sodium silicate, 10 parts of fatty alcohol-polyoxyethylene ether and 85 parts of deionized water, wherein the temperature of the degreasing agent is 85 ℃, and then the surface of the degreasing agent is cleaned by hot water and dried.
Example 6
The bolt of example 1 was subjected to a heat treatment process comprising the following processing steps:
(1) heating: placing the bolt to be treated in a heating furnace, introducing a certain amount of mixed gas of methanol and propane in a volume ratio of 1.2:1.5, heating the heating furnace to 800 ℃, and preserving heat for 2 hours at the temperature;
(2) tempering: reducing the temperature in the heating furnace to 700 ℃ at a cooling speed of 17 ℃/h, and preserving the heat for 7.5h at the temperature;
(3) high-temperature quenching: then putting the bolt in mineral oil at 500 ℃ for quenching for 1 h;
(4) and (3) cooling: taking out the bolt obtained in the step (3), and placing the bolt in water at 27 ℃ for cooling;
(5) oil removal: and (4) placing the bolt obtained in the step (4) into an oil removal agent for oil removal, wherein the oil removal agent comprises the following components in parts by weight: 72 parts of sodium carbonate, 32 parts of disodium hydrogen phosphate, 20 parts of sodium silicate, 7 parts of fatty alcohol-polyoxyethylene ether and 62 parts of deionized water, wherein the temperature of the degreasing agent is 75 ℃, and then the surface of the degreasing agent is cleaned by hot water and dried.
Comparative example
Two steel plates having the same size were used, and one of the steel plates was subjected to a heat treatment process having the same parameter settings as in example 4 as comparative example 2, and then subjected to performance tests with the products obtained in examples 1 to 6, the test results of which are shown in table 1 below.
Table 1 results of performance testing
Yield strength/MPa Tensile strength/MPa Elongation/percent Corrosion resistance reduction/%)
Example 1 587 667 4.2 0.034
Example 2 780 923 2.9 0.097
Example 3 652 785 3.4 0.062
Example 4 672 759 3.1 0.041
Example 5 693 794 2.7 0.057
Example 6 680 811 2.9 0.042
Comparative example 1 235 215 2.0 0.197
Comparative example 2 389 421 1.9 0.174
In which corrosion resistance was measured by immersing bolts in 15% (mass fraction) aqueous HCl for 24 hours, and then measuring the amount of corrosion loss before and after the immersion.
From the results, the bolt treated by the heat treatment process has higher strength and can keep the corrosion resistance; the bolt is made of various metals, so that the bolt has high strength and good corrosion resistance.
The foregoing is directed to embodiments of the present invention and, more particularly, to a method and apparatus for controlling a power converter in a power converter, including a power converter, a power converter.

Claims (9)

1. A heat treatment process of a high-strength corrosion-resistant bolt is characterized by comprising the following steps: the method comprises the following processing steps:
(1) heating: placing the bolt to be treated in a heating furnace, introducing a certain amount of mixed gas of methanol and propane, heating the heating furnace to 800 ℃, and preserving heat for 2 hours at the temperature;
(2) tempering: reducing the temperature in the heating furnace to 700 ℃ at a cooling speed of 15-20 ℃/h, and preserving the heat for 7-8h at the temperature;
(3) high-temperature quenching: then putting the bolt in mineral oil at 500 ℃ for quenching for 1 h;
(4) and (3) cooling: taking out the bolt obtained in the step (3), and placing the bolt in water at the temperature of 20-35 ℃ for cooling;
(5) oil removal: and (4) placing the bolt obtained in the step (4) into an oil removing agent for oil removal, wherein the temperature of the oil removing agent is 65-85 ℃, and then drying after cleaning the surface with hot water.
2. The heat treatment process of a high-strength corrosion-resistant bolt according to claim 1, wherein: the volume ratio of the methanol to the propane is 1-1.5: 1-2.
3. The heat treatment process of a high-strength corrosion-resistant bolt according to claim 1, wherein: the oil remover comprises the following components in parts by weight: 65-80 parts of sodium carbonate, 25-40 parts of disodium hydrogen phosphate, 15-25 parts of sodium silicate, 5-10 parts of fatty alcohol-polyoxyethylene ether and 50-85 parts of deionized water.
4. The heat treatment process of a high-strength corrosion-resistant bolt according to claim 1, wherein: the bolt comprises the following components in proportion: 15-25% of chromium, 10-15% of cadmium, 5-10% of molybdenum, 1-3% of tungsten, 0.5-1.5% of vanadium, 0.1-0.3% of silicon, 0.01-0.03% of niobium and the balance of iron and inevitable impurities, wherein the content of the impurities is not more than 0.1%.
5. The heat treatment process of the high-strength corrosion-resistant bolt according to claim 4, wherein: the bolt comprises the following components in proportion: 20-25% of chromium, 12-15% of cadmium, 5-10% of molybdenum, 1-3% of tungsten, 0.5-1.5% of vanadium, 0.1-0.3% of silicon, 0.01-0.03% of niobium and the balance of iron and inevitable impurities, wherein the content of the impurities is not more than 0.08%.
6. The heat treatment process of the high-strength corrosion-resistant bolt according to claim 4, wherein: the bolt comprises the following components in proportion: 20-25% of chromium, 10% of cadmium, 5-10% of molybdenum, 1-3% of tungsten, 0.5-1.5% of vanadium, 0.1-0.3% of silicon, 0.01-0.03% of niobium and the balance of iron and inevitable impurities, wherein the content of the impurities is not more than 0.08%.
7. The heat treatment process of the high-strength corrosion-resistant bolt according to claim 4, wherein: the bolt comprises the following components in proportion: 15-25% of chromium, 15% of cadmium, 5-10% of molybdenum, 1-3% of tungsten, 1.5% of vanadium, 0.1-0.3% of silicon, 0.01-0.03% of niobium, and the balance of iron and inevitable impurities, wherein the content of the impurities is not more than 0.08%.
8. The heat treatment process for a high-strength corrosion-resistant bolt according to any one of claims 4 to 7, wherein: the content of phosphorus in the impurities is not more than 0.03%.
9. The heat treatment process for a high-strength corrosion-resistant bolt according to any one of claims 4 to 7, wherein: the content of sulfur in the impurities is not more than 0.035%.
CN202011152524.4A 2020-10-26 2020-10-26 Heat treatment process of high-strength corrosion-resistant bolt Pending CN112359192A (en)

Priority Applications (1)

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Application Number Priority Date Filing Date Title
CN202011152524.4A CN112359192A (en) 2020-10-26 2020-10-26 Heat treatment process of high-strength corrosion-resistant bolt

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105696006A (en) * 2014-11-28 2016-06-22 重庆基石机械有限公司 Environment-friendly degreasing agent
CN106119709A (en) * 2016-07-13 2016-11-16 马鞍山市万鑫铸造有限公司 Screw connector of high-temp resistance and anti-deformation and preparation method thereof
CN107502708A (en) * 2017-08-22 2017-12-22 厦门真冈热处理有限公司 The heat treatment method of automobile SCM435 steel high-intensity fasteners
CN110695322A (en) * 2019-09-24 2020-01-17 江苏永昊高强度螺栓有限公司 High-strength wear-resistant bolt and machining process thereof
CN110695627A (en) * 2019-10-31 2020-01-17 李秋文 Hot heading processing technology for fastener
CN111020125A (en) * 2019-12-24 2020-04-17 苏州天东紧固件有限公司 Preparation method of high-strength low-temperature-resistant corrosion-resistant fastener

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105696006A (en) * 2014-11-28 2016-06-22 重庆基石机械有限公司 Environment-friendly degreasing agent
CN106119709A (en) * 2016-07-13 2016-11-16 马鞍山市万鑫铸造有限公司 Screw connector of high-temp resistance and anti-deformation and preparation method thereof
CN107502708A (en) * 2017-08-22 2017-12-22 厦门真冈热处理有限公司 The heat treatment method of automobile SCM435 steel high-intensity fasteners
CN110695322A (en) * 2019-09-24 2020-01-17 江苏永昊高强度螺栓有限公司 High-strength wear-resistant bolt and machining process thereof
CN110695627A (en) * 2019-10-31 2020-01-17 李秋文 Hot heading processing technology for fastener
CN111020125A (en) * 2019-12-24 2020-04-17 苏州天东紧固件有限公司 Preparation method of high-strength low-temperature-resistant corrosion-resistant fastener

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