Contact resistance heating quenching by electrode will be less than 5 v voltage is added to the precision steel tube, the electrode and its current through the large contact area, and produce a lot of heat resistance, make its surface heating to the quenching temperature, then move the electrode, the heat is introduced into products within the surface cooling, the purpose of quenching.
What are precision steel tube heat treatment method for surface quenching through beam impact tubes different heat source to heat precision steel tube, when the temperature of the workpiece surface is above the critical point for cooling, so got hardened surface layer and the core is still keeping the original tissue. More for induction heating in industrial application and flame heating surface hardening.
Chemical heat treatment will add heat and heat preservation products placed in the medium containing active element, make the active atoms into product surface or form a compound coating, to change the surface of the organization and the chemical composition, which makes the surface of the workpiece in mechanical/physical and chemical properties.
Electrolytic quenching to place it in acid, alkali or salt aqueous electrolyte, the products meet the cathode and anode electrolyzer. After direct current electrolyte by electrolysis, release oxygen in the anode, hydrogen in precision impact beam tubes steel pipe. Hydrogen gas film around the product, a resistance and generate heat, heat the surface to the quenching temperature, then power outages, gas film disappears, electrolyte becomes a quenching cooling medium, make its surface cooling and hardening.
The advantages of the aluminium tube: hot dip aluminum tube aluminum plating layer thickness, coating uniformity, strong adhesion, long service life, etc. Electroplating aluminum cost is low, the surface is not very smooth, its poor corrosion resistance. Disadvantages: cold aluminized layer is electrodeposited coating, zinc layer and steel substrate layer separately. Zinc layer side impact door beams is thinner, the zinc layer attached to the steel substrate simple, easy to fall off, so its corrosion resistance is poor. In the new residence, banning the use of cold plating products as feed pipe. Hot dip aluminum pipe widely used in construction, machinery, coal, chemical industry, railway vehicles, automotive industry, roads, Bridges, containers, sports facilities, agricultural machinery, petroleum machinery manufacturing industry. Product surface with hot dip plating or electroplating aluminum layer of welded steel pipe. Aluminium can increase steel pipe corrosion resistance, prolong service life. Aluminium tube in addition to water, oil and other general low pressure fluid line pipe, also used in the oil industry, chemical coking equipment of oil heater, the condensing distillation wash oil cooler, coal exchange for tube, and trestle pile, mining tunnel supporting frame tube, etc.