Double-pass hot upsetting forming technology of stainless steel/carbon steel metallurgy composite bolt
A forming process and stainless steel technology, applied in the field of standard parts technology and composite materials, can solve the problems that ordinary galvanized carbon steel bolts cannot meet the corrosion resistance requirements and safety requirements, the impact and harm are large, and the bolt corrosion is inconspicuous. The process has strong operability, reducing raw material costs and saving stainless steel materials.
Inactive Publication Date: 2017-10-27
承德石油高等专科学校
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Problems solved by technology
Some important pipelines or reactors are fastened and sealed by bolts, and the corrosion of the bolts is very inconspicuous, but once the bolts fail due to corrosion, the impact and harm will be huge
Therefore, ordinary galvanized carbon steel bolts in this environment can no longer meet its corrosion resistance and safety requirements.
[0003] Stainless steel has high corrosion resistance, so the application of stainless steel bolts is born, but because stainless steel is relatively high, it limits its wide range of use
Method used
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Embodiment 1
[0034] 1. Raw materials: Q235 carbon steel bars and 304 stainless steel seamless pipes are used as raw materials, in which the outer diameter of the stainless steel tube is 18mm, the inner diameter is 14mm, and the diameter of the carbon steel bar is 12mm.
[0035] 2. Raw material treatment: Brush the inner wall of the above-mentioned stainless steel pipe and the outer surface of the carbon steel bar to make the surface roughness about Rz6.3, and then perform high-pressure cleaning and drying treatment.
[0036] 3. Preparation of the composite billet: the above-mentioned processed carbon steel bars are penetrated into stainless steel pipes, and drawn on a drawing machine. After drawing, the outer diameter of the composite steel bars is 16.5 mm, and the diameter reduction rate is 9%. The steel bar after drawing is cut to length into small sections of 65mm, and the carbon steel of the two sections of the small section composite steel bars is drilled 7mm deep on a special machine ...
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Abstract
The invention provides a double-pass hot upsetting forming technology of a stainless steel / carbon steel metallurgy composite bolt. The technology comprises the following steps that (1) stainless steel tubes and carbon steel rebars are used as raw materials, and the inner surfaces of the stainless steel tubes and the outer surfaces of the carbon steel rebars are subjected to surface cleaning; (2) the carbon steel rebars are inserted into the stainless steel tubes and subjected to cold-drawing processing, and the diameter reduction rate is 5-10%; (3) the drawn stainless steel / carbon steel composite rebars are subjected to fixed length cutting and solder sealing at two ends; (4) prepared composite billets are heated with a high frequency to 1100-1150 DEG C at the speed of 20 DEG C / s, special molds are adopted to conduct first-pass hot upsetting bolt bar sizing and second-pass hot upsetting bolt head forming; (5) after hot upsetting is completed, a bolt bar is subjected to heat preservation for 1-2 hours at the temperature of 900-1050 DEG C, and cooled to the room temperature rapidly. The double-pass hot upsetting forming technology of the stainless steel / carbon steel metallurgy composite bolt is easy and low in cost, the stainless steel / carbon steel metallurgy composite bolt is produced by adopting the double-pass hot upsetting forming technology, good metallurgy combination can be formed between the stainless steel and the carbon steel, meanwhile the wall thickness of the stainless steel is evenly distributed, and the surface quality is high.
Description
technical field [0001] The invention relates to the technical field of standard parts and the field of composite materials, in particular to a double-pass hot upsetting process for stainless steel / carbon steel metallurgical composite bolts. Background technique [0002] Ordinary carbon steel bolts are widely used as the most common fasteners, but they often corrode under the influence of environmental factors such as rain, snow, sunlight, and temperature difference between day and night. For the anti-corrosion of carbon steel bolts, the most common methods are hot-dip and electro-galvanized coatings on the surface of carbon steel, but this method only has a certain anti-corrosion ability for ordinary environments, but for highly corrosive environments such as chemical plants and nuclear power plants, Bolt corrosion is more serious. Some important pipelines or reactors are fastened and sealed by bolts, and the corrosion of bolts is very inconspicuous, but once the bolts fail...
Claims
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IPC IPC(8): B21J1/00B21J1/06B21J5/02B21H3/06
CPCB21H3/06B21J1/00B21J1/06B21J5/025
Inventor 高亚男
Owner 承德石油高等专科学校