Large-diameter seamless steel pipes are steel products formed by cold processing such as cold drawing and cold rolling. The state in which they are delivered directly without any heat treatment is called cold drawn or cold rolled state. Compared with the hot-rolled (forged) state, steel in the cold-

Three-oil and two-cloth anti-corrosion steel pipes use three-layer coating oil technology and two-layer weaving technology to give the surface extremely strong anti-corrosion properties and can be used for a long time in harsh environments without being affected by external corrosion. This three-lay

(1) Spraying (throwing) rust removal uses a high-power motor to drive the spraying (throwing) blades to rotate at high speed so that steel sand, steel shots, wire segments, minerals, and other abrasives spray (throw) the surface of the steel pipe under the action of centrifugal force. ) shot treatme

1. The arc starting method of stainless steel pipe fittings adopts the reflow method, and the arc closing method adopts the method of filling the arc crater. The arcing process should be completed within the slope, and arcing and arcing cannot be performed on the surface of the busbar of pipes and f

1. Angle steel and channel steel should be stacked in the open air, that is, the mouth should be facing down. I-beams should be placed upright, and the I-beam surface of the steel should not be facing up to avoid water accumulation and rust. 2. Corresponding passages should be left between stacks.

Large diameter thick wall seamless steel pipes are mainly reflected in: 1. Large diameter: It is generally believed that those with diameters above 219 are large-diameter seamless pipes, seamless steel pipes are large-diameter seamless pipes, those with diameters less than 76 are small-diameter sea

Steel bending pipe processing and forming technology 1. Die forging. For socket welding and threaded tees, crosses, elbows, and other small pipe fittings, the shapes are more complex and should be manufactured by the die forging process. The die forging blank should be rolled profiles, such as bars

1. The principal requirement for stacking spiral steel pipes is to stack them according to types and specifications on the premise of ensuring stable stacking and ensuring safety. Different types of materials should be stacked separately to prevent confusion and mutual erosion; 2. It is prohibite

The processing methods of 3pe anti-corrosion steel pipes are generally divided into two types: winding type and round die covering type; both are composed of 3-layer structure: the first layer of epoxy powder (FBE>100um), the second layer of adhesive (AD) 170~250um, The third layer of polyethylen

Cleaning methods for large diameter steel pipes: 1. Shot blasting and rust removal: A high-power motor drives the blades to rotate at high speed, so that steel sand, steel shots, wire segments, minerals, and other abrasives are sprayed and blasted on the surface of the steel pipe under the action o

If the spiral steel pipe for water transportation is to transport tap water or drinking water, the inner wall is generally made of IPN8710 non-toxic anti-corrosion coating, and the outer wall is made of epoxy coal pitch anti-corrosion. Of course, it can also be coated with internal and external plas

Characteristics of large-diameter straight-seam plastic-coated steel pipes: Its characteristics combine the characteristics of straight-seam steel pipes and the characteristics of epoxy resin. 1: Characteristics of straight seam steel pipes: Straight seam steel pipes have a simple production proc

Cleaning: 1. The workpieces and fixtures should be cleaned of oil, residual salt, paint, and other foreign matter before heat treatment. 2. The fixture used for the first time in the vacuum furnace should be degassed and purified in advance at a vacuum level not lower than that required by the wor

310S stainless steel thick-walled steel pipe has very good oxidation resistance and corrosion resistance. Because it contains a high percentage of chromium and nickel, it has high creep strength and can continue to operate at high temperatures. The working temperature is 1200 ℃, the continuous use t

Many variable factors characterize the corrosive medium, namely chemicals and their concentration, atmospheric conditions, temperature, and time, so it is difficult to use and select materials without knowing the correct properties of the medium. However, the following can serve as a selection gu

Defects that are prone to occur in the submerged arc welding zone include pores, hot cracks, and undercuts. 1. Bubbles. Bubbles mostly occur in the center of the weld bead. The main reason is that hydrogen is still hidden in the welded metal in the form of bubbles. Therefore, the measure to elimina

Overview of the development of high-frequency straight seam welded pipe production, high-frequency straight seam welded pipe production technology and workshop layout, typical high-frequency straight seam welded pipe units and series, strip preparation equipment, continuous plowing unit, L-shaped

The quality of non-standard straight seam welded steel pipes is not only related to their service life but also to their subsequent use efficiency. So when we buy non-standard straight seam welded steel pipes, how can we buy high-quality non-standard straight seam welded steel pipes? What about stra