Galvanized seamless pipes are seamless steel pipes processed by hot-dip galvanizing or electro-galvanizing processes. They combine the high strength of seamless pipes with the corrosion resistance of the galvanized layer and are widely used in scenarios with high requirements for corrosion resistance and pressure resistance. The following is an analysis from two aspects: core characteristics and typical applications: 1. Core characteristics: anti-corrosion + high strength + easy processing Excellent corrosion resistance Hot-dip galvanized layer: coating thickness ≥85μm (national standard), forming a zinc-iron alloy layer, salt spray resistance test over 1000 hours, suitable for outdoor, humid or acid-base environments. Electro-galvanized layer: coating is about 10-20μm, the surface is smoother, suitable for […]

Galvanized steel pipes used for domestic water supply are all connected by threads, also known as threaded connections. Generally, water supply pipes with a nominal diameter not exceeding 100 mm and a nominal pressure not exceeding 1 MPa can be connected by threads. The threads of the connecting pipes are also divided into two types, cone and cylindrical, like pipe joints. If the general pipes are manually threaded, they usually do not meet the conical pipe threads. The pitch and other technical requirements of cylindrical pipe threads are the same as those of conical pipe threads. Pipe threads can be made by threading with pipe hinges or by lathes. There […]

Hot-dip pure zinc products, code is GI. The characteristics of hot-dip pure zinc products are beautiful surface, good corrosion resistance and good processability. It is divided into two types, one is normal zinc spangles, and the other is zinc-free spangles. In the past, hot-dip galvanized products always had some zinc spangles on the surface because the lead in the zinc liquid could not be refined very pure, so our old concept is that hot-dip galvanizing has zinc spangles. With the needs of the automotive industry, if hot-dip galvanized automotive plates are to be painted, zinc spangles will have an impact on the painting. Later, by reducing the lead content in […]

Before hot-dip galvanized steel pipe welding, the hot-dip galvanized steel pipe is mainly heated, and welding begins after temperature control for 30 minutes. The heating, solid layer temperature and heat treatment process of welding are automatically controlled by the temperature control cabinet of the heat treatment process. The far-infrared crawler heat treatment furnace is used to automatically set the curve and describe the curve, and the thermal resistor measures the temperature. During heating, the distance between the thermal resistance measurement points is 15mm-20mm from the weld boundary. In order to better prevent the hot-dip galvanized steel pipe from welding deformation, each column joint is welded symmetrically by two people, and […]

1. Galvanized pipes and fixtures should be cleaned of foreign objects such as oil, residual salt, paint, etc. before heat treatment; 2. The fixtures used in the vacuum furnace for the first time should be degassed and purified in advance at a vacuum degree not lower than the required degree of the workpiece; 3. Workpieces that are easy to deform during the heat treatment process should be heated on special fixtures. The preheating methods are: one preheating is 800℃, the second preheating is 500-550℃ and 850℃, and the temperature rise rate of the first preheating should be limited; 4. Workpieces with complex shapes or sharp changes in cross-section and large […]