Straight seam elbow seamless elbow sales

The deformation characteristic of hot push bend is to determine the blank diameter according to the rule of the constant volume before and after the plastic deformation of the metal material, the diameter of the blank is smaller than the diameter of the bend.More and more industries and enterprises use 20G elbow, 20G elbow is made of 5310 raw materials.For some standouts, users are asked about quality issues.Then it is cooled slowly, called annealing.The annealing of hot pressing elbow is a heat treatment method which heats the steel to the temperature of phase change or partial phase change and cools it slowly after heat preservation.The purpose of annealing is to eliminate microstructure defects, improve microstructure, homogenize composition and refine grain, improve mechanical properties of hot-pressed elbow, and reduce residual stress.At the same time can reduce hardness, improve plasticity and toughness, improve machining performance.Therefore, annealing is not only to eliminate and improve the organization defects and internal stress left by the previous process, but also to prepare for the subsequent process. Therefore, annealing is a semi-finished product heat treatment, also known as pre-heat treatment.Features welding elbow, welding elbow after the completion of the welding operation needs to be based on the actual situation or pipeline environment for rust or corrosion prevention treatment, in order to avoid the elbow in the weld corrosion or corrosion.This process allows us to clarify the quality of the butt welding elbow before use.Typically butt welding elbows are welded at the pipe construction site.Continuous operation, suitable for mass production characteristics, so become the main method of forming carbon steel, alloy steel elbow, stainless steel elbow forming.Flame heating and reflector heating, depending on the requirements of forming products and energy conditions.To reduce costs.The geometric dimensions include outer diameter, inner diameter and wall thickness.You also need to control the radius of curvature.Just as the radius length is 1.5D, the radius of curvature must be within the required tolerance.Because most of those pipe fittings are used for welding, in order to improve the quality of welding, the end is beveled, leaving a certain Angle, with a certain edge, this requirement is also very strict, how thick the edge is, how much the Angle and the range of deviation are often stipulated, geometric size than the number of pipe fittings increased many items.Large diameter butt welding elbow and steel pipe connection with welding, flange connection, socket welding and other joint forms.Welding elbow in the actual production, in strict accordance with a certain process and scale production, strict implementation of national standards, is how much pressure on the production of thick, do not cut corners, in accordance with the normal production process, to ensure that the welding elbow can show good value and role in the actual work.

1. Since most pipe fittings are used for welding, in order to improve the welding quality, the end is beveled with a certain Angle and a certain edge, which is also a strict requirement. There are provisions on how thick the edge is, how much the Angle is and the range of deviation.The surface quality and mechanical properties are basically the same as the pipe.For ease of welding, the fittings are of the same type of steel as the connected pipes.

2. All pipe fittings shall be treated with surface treatment. The iron oxide on the inner and outer surface shall be sprayed with shot peening and then coated with anti-corrosion paint.This is for export needs, in addition, in order to facilitate transportation and prevent corrosion and oxidation at home, we should do this work.

3, it is to the requirement of packaging to small pipe fitting, such as export, need to do wooden cases, about 1 cubic meter, the number of elbow in this kind of box about cannot exceed a ton, the standard allows suit, namely big set small, but total weight cannot exceed 1 ton commonly.Single packing is required for large pieces like 24 ".The other is the packaging mark, mark is to indicate the size, steel number, batch number, manufacturer's trademark and so on.

According to the type of crystal lattice, low-temperature steel can be divided into two categories: iron-body cubic low-temperature steel and face-centered cubic austenitic low-temperature steel.16Mn is low-alloy high-strength structural steel: the carbon content is 0.1-0.25%, and the main alloy elements such as manganese, silicon, vanadium, niobium and titanium are added.It contains less than 3% of the total alloy.According to the intensity, it is divided into four grades: 300MPA, 350MPA, 400 and 450MPa.There is QQQQQ460."Q" is the upper caps of the Chinese phonetic alphabet for yielding "bend", followed by the number of the minimum yield point (sigma s) value of the brand. The so-called hot stamping is a method of pressing the bending of the pipe blank with inner core directly by using the die.In the initial production of seamless elbow, stamping method to achieve the mass production of elbow, and widely used in the production of elbow.