High strength bolt material and preparation method thereof
What is Al technical title?
Al technical title is built by PatSnap Al team. It summarizes the technical point description of the patent document.
A high-strength bolt, weight percentage technology, applied in the field of bolt materials, can solve problems such as low economy, large limitations, and reduced bolt yield.
Active Publication Date: 2018-01-19
NINGBO ZHENHAI YONGDING FASTENER
View PDF6 Cites 3 Cited by
Summary
Abstract
Description
Claims
Application Information
AI Technical Summary
This helps you quickly interpret patents by identifying the three key elements:
Problems solved by technology
Method used
Benefits of technology
Problems solved by technology
[0003] In the prior art, Chinese patent literature with application number 201210468134.7 reports a high-strength bolt and its processing method. The bolt is made of high-strength bolt steel through cold heading, quenching and tempering, finishing and blackening. The high-strength bolt has the characteristics of good strength, hardness, plasticity and toughness, good cold working performance and long service life. However, it is easy to deform and crack the workpiece during the quenching and tempering process, which reduces the yield of the bolt. Process ...
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more
Image
Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
Click on the blue label to locate the original text in one second.
Reading with bidirectional positioning of images and text.
Smart Image
Examples
Experimental program
Comparison scheme
Effect test
preparation example Construction
[0025] Correspondingly, the present invention also provides a method for preparing the high-strength bolt material described in the above technical solution, comprising the following steps: smelting 42CrMo steel, ferro-titanium, ferro-vanadium, ferro-niobium and ferronickel in a vacuum induction furnace, casting A steel ingot is obtained; the steel ingot is heated to 1100-1300° C. for heat preservation, forged, and air-cooled to obtain a high-strength bolt material.
[0026] As a preferred solution, the mass of the steel ingot is 20kg. In the present invention, the steel ingot is heated to 1100-1300° C. for heat preservation, and the heat preservation time is preferably 1-4 hours; and the round rod with a diameter of 16 mm is preferably obtained by forging. In the step of obtaining high-strength bolt material, the final forging temperature is preferably 800-1000°C.
[0027] It can be seen from the above scheme that the present invention has the following advantages: the high-...
Embodiment 1
[0031] 42CrMo steel, ferro-titanium, ferro-vanadium, ferroniobium and ferronickel were smelted and poured into a 20kg ingot in a 250kg vacuum induction furnace, and then the ingot was heated to 1100°C for 4 hours and then forged into a round bar with a diameter of 16mm. The forging temperature is 800°C, air cooling after forging to obtain high-strength bolt materials, the weight percentage of each chemical composition is: C: 0.2%, Si: 0.2%, N: 0.004%, Mn: 0.4%, Cr: 1.5%, V : 0.02%, Ti: 0.02%, Mo: 0.3%, Nb: 0.02%, Ni: 0.5%, P: 0.004%, S: 0.003%, and the balance is Fe.
Embodiment 2
[0033]42CrMo steel, ferro-titanium, ferro-vanadium, ferro-niobium and ferronickel were smelted and poured into a 20-kg steel ingot in a 250-kg vacuum induction furnace. The forging temperature is 900°C, air cooling after forging, to obtain high-strength bolt material, the weight percentage of each chemical composition is: C: 0.4%, Si: 0.8%, N: 0.01%, Mn: 0.5%, Cr: 1.0%, V : 0.15%, Ti: 0.05%, Mo: 0.4%, Nb: 0.05%, Ni: 0.8%, P: 0.004%, S: 0.003%, and the balance is Fe.
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more
PUM
Login to view more
Abstract
The invention provides a high strength bolt material and a preparation method thereof. An appropriate amount of microalloy elements of Ti and Nb are added on the basis of 42CrMo steel. The microalloyelements and elements of C and N can form carbon nitride particles to refine austenite grains to form a hydrogen trap, so that material strength and toughness are improved and material resistance to delayed fracture is also improved. The elements of Mo and the like improve the drawing temperature and reduces the content of hydrogen invading from the surface of the material, so that increasing of sensitivity of material delayed fracture is effectively prevented. According to the high strength bolt material, the element of Ni is added. On the one hand, the mechanical property of the material isimproved by the element of Ni cooperating with Ti, Nb and the like. On the other hand, the material resistance to delayed fracture is improved by matching of the element Ni and the element Mo. According to the high strength bolt material, the contents of elements of P, S, Mn and the like are reduced; the amount of non-metallic inclusions in steel is greatly reduced and sensitivity of material delayed fracture is reduced.
Description
technical field [0001] The invention relates to the technical field of bolt materials, in particular to a high-strength bolt material and a preparation method thereof. Background technique [0002] High-strength bolts are widely used in automobiles, machinery manufacturing, energy, transportation, bridges, construction, chemicals, aerospace and other fields, and the reliability of their product quality plays an important role in the performance of the main body and the safety of the structure. With the development of manufacturing technology, the requirements for the quality, reliability and stability of bolts have been further improved. At the same time, higher requirements have been put forward for the strength, corrosion resistance, processing performance and fatigue performance of bolt materials. [0003] In the prior art, Chinese patent literature with application number 201210468134.7 reports a high-strength bolt and its processing method. The bolt is made of high-stre...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more
Application Information
Patent Timeline
Application Date:The date an application was filed.
Publication Date:The date a patent or application was officially published.
First Publication Date:The earliest publication date of a patent with the same application number.
Issue Date:Publication date of the patent grant document.
PCT Entry Date:The Entry date of PCT National Phase.
Estimated Expiry Date:The statutory expiry date of a patent right according to the Patent Law, and it is the longest term of protection that the patent right can achieve without the termination of the patent right due to other reasons(Term extension factor has been taken into account ).
Invalid Date:Actual expiry date is based on effective date or publication date of legal transaction data of invalid patent.
Login to view more 
Login to view more