CN103436794A - Preparation method for molybdenum-containing cold-heading steel used for high-strength fastener - Google Patents
Preparation method for molybdenum-containing cold-heading steel used for high-strength fastener Download PDFInfo
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- CN103436794A CN103436794A CN2013102904839A CN201310290483A CN103436794A CN 103436794 A CN103436794 A CN 103436794A CN 2013102904839 A CN2013102904839 A CN 2013102904839A CN 201310290483 A CN201310290483 A CN 201310290483A CN 103436794 A CN103436794 A CN 103436794A
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Abstract
The invention provides a preparation method for molybdenum-containing cold-heading steel used for a high-strength fastener. The preparation method comprises the following steps: fusing; oxidation; detection of alloy components and adjustment; refining; casting; hot rolling; and heat treatment. The steel is characterized by comprising the following chemical elements by weight: 0.2 to 0.34% of carbon, 0.2 to 0.25% of chromium, 0.1 to 0.14% of vanadium, 1.2 to 1.3% of silicon, 0.3 to 0.4% of molybdenum, 0.6 to 0.8% of manganese, 0.2 to 0.24% of magnesium, 0.1 to 0.02% of sulfur, 0.02 to 0.04% of phosphorus, 0.5 to 0.8% of aluminum, 0.05 to 0.1% of titanium and 0.05 to 0.08% of boron, with the balance being iron. The steel prepared in the invention has low strength and hardness, good plasticity and excellent hardenability and enables a manufacturing process for a fastener to be simplified, energy to be saved and pollution to be reduced; produced fasteners with large specifications have strength of more than grade 8.8; and the preparation method has the advantages of simpleness, easy implementation and low cost.
Description
Technical field
The present invention relates to a kind of steel, specifically the preparation method containing the molybdenum cold heading steel for a kind of high-intensity fasteners.
Background technology
Fastening piece is to be fastenedly connected with and to apply class mechanical component very widely.On various machinery, equipment, vehicle, boats and ships, railway, bridge, building, structure, instrument, instrument, instrument and articles for use etc., can see fastening piece miscellaneous.Fastening piece is the mechanical industry basic part, and demand is very big, and fastening piece comprises various bolts, riveted joint, nut, rivet etc., due to the connection of fastening piece for various structured materials, need to bear very large pressure, shearing force.Present fastener material, adopts cold heading steel more, now cold riveting steel easy splitting when cold-heading, bursts apart or fractures, and safety is used in impact.
Summary of the invention
The purpose of this invention is to provide the preparation method containing the molybdenum cold heading steel for a kind of high-intensity fasteners.
The present invention is achieved by the following technical solutions.
Preparation method containing the molybdenum cold heading steel for a kind of high-intensity fasteners, comprise fusing, oxidation, detection alloying constituent adjustment, refining, casting, hot rolling, thermal treatment, it is characterized in that: the per-cent of its chemical element weight is: carbon 02-0.34, chromium 0.2-0.25, vanadium 0.1-0.14, silicon 1.2-1.3, molybdenum 0.3-0.4, manganese 0.6-0.8, magnesium 0.2-0.24, sulphur .01-0.02, phosphorus 0.02-0.04, Al0.5～0.8, Ti0.05～0.1, B0.05～0.08, surplus are iron.
Thermal treatment refers to: rolled piece is warming up to 560-615 ℃ with 120-135 ℃/h of speed, insulation 4-6 hour; Then, then be warming up to 710-745 ℃ with 35-55 ℃/h of speed, insulation 2-3 hour; Be cooled to 160-180 ℃ with 110-130 ℃/h of speed again, insulation 2-3 hour; Be warming up to 960-990 ℃ with 60-80 ℃/h of speed again, insulation 2-3 hour; Put into again 180-210 ℃ of solvent oil with being chilled to room temperature.
Steel grade intensity of the present invention and hardness is low, plasticity is good, hardening capacity is good, can simplify the fastening piece manufacturing process, and save energy reduces and pollutes, and the large specification fastener strength of producing is more than 8.8 grades.Simultaneously, preparation technology of the present invention is simple, easy to implement, with low cost.
Embodiment
Preparation method containing the molybdenum cold heading steel for a kind of high-intensity fasteners, comprise fusing, oxidation, detection alloying constituent adjustment, refining, casting, hot rolling, thermal treatment, the per-cent of its chemical element weight is: carbon 02-0.34, chromium 0.2-0.25, vanadium 0.1-0.14, silicon 1.2-1.3, molybdenum 0.3-0.4, manganese 0.6-0.8, magnesium 0.2-0.24, sulphur .01-0.02, phosphorus 0.02-0.04, Al0.5～0.8, Ti0.05～0.1, B0.05～0.08, surplus are iron;
Thermal treatment refers to: rolled piece is warming up to 560-615 ℃ with 120-135 ℃/h of speed, insulation 4-6 hour; Then, then be warming up to 710-745 ℃ with 35-55 ℃/h of speed, insulation 2-3 hour; Be cooled to 160-180 ℃ with 110-130 ℃/h of speed again, insulation 2-3 hour; Be warming up to 960-990 ℃ with 60-80 ℃/h of speed again, insulation 2-3 hour; Put into again 180-210 ℃ of solvent oil with being chilled to room temperature.
The refining agent that adopts following weight part (kilogram) raw material to prepare when refining: calcium aluminate 2, nano-calcium carbonate 1, quartz sand 2.6, lapis amiridis 1.2, SnO
22.0, Calcium Fluoride (Fluorspan) 2.2, sodium-chlor 3, alum 2.Above-mentioned material is added to deionized water and grind slurrying in 2-3 hour and cross the 300-500 mesh sieve, spraying drying, at 200-250 ℃ of lower roasting 2-3 hour and get final product.
Deoxidation of the present invention, desulfurization, dephosphorization rate, between 60-75%, are removed the inclusion in molten steel and make the internal soundness that inclusion modification is effective, cleaning molten steel has improved steel, and the degree of porosity in foundry goods reduces the 1-2 degree, is controlled effectively.
The prepared riveted joint of the present invention with the cold heading steel material mechanical performance is: tensile strength 1060Mpa, yield strength 940Mpa, ballistic work A
ku176J, unit elongation: 25%, relative reduction in area: 56%.
Claims (2)
1. the preparation method containing the molybdenum cold heading steel for a high-intensity fasteners, comprise fusing, oxidation, detection alloying constituent adjustment, refining, casting, hot rolling, thermal treatment, it is characterized in that: the per-cent of its chemical element weight is: carbon 02-0.34, chromium 0.2-0.25, vanadium 0.1-0.14, silicon 1.2-1.3, molybdenum 0.3-0.4, manganese 0.6-0.8, magnesium 0.2-0.24, sulphur .01-0.02, phosphorus 0.02-0.04, Al0.5～0.8, Ti0.05-0.1, B0.05～0.08, surplus are iron.
2. high-intensity fasteners use according to claim 1 is containing the preparation method of molybdenum cold heading steel, and it is characterized in that: thermal treatment refers to: rolled piece is warming up to 560-615 ℃ with 120-135 ℃/h of speed, insulation 4-6 hour; Then, then be warming up to 710-745 ℃ with 35-55 ℃/h of speed, insulation 2-3 hour; Be cooled to 160-180 ℃ with 110-130 ℃/h of speed again, insulation 2-3 hour; Be warming up to 960-990 ℃ with 60-80 ℃/h of speed again, insulation 2-3 hour; Put into again 180-210 ℃ of solvent oil with being chilled to room temperature.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013102904839A CN103436794A (en) | 2013-07-11 | 2013-07-11 | Preparation method for molybdenum-containing cold-heading steel used for high-strength fastener |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013102904839A CN103436794A (en) | 2013-07-11 | 2013-07-11 | Preparation method for molybdenum-containing cold-heading steel used for high-strength fastener |
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| Publication Number | Publication Date |
|---|---|
| CN103436794A true CN103436794A (en) | 2013-12-11 |
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| CN2013102904839A Pending CN103436794A (en) | 2013-07-11 | 2013-07-11 | Preparation method for molybdenum-containing cold-heading steel used for high-strength fastener |
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| CN (1) | CN103436794A (en) |
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- 2013-07-11 CN CN2013102904839A patent/CN103436794A/en active Pending
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Application publication date: 20131211 |