3First， the wall thickness of high-quality and smooth steel is particularly thick. Because the thicker the wall thickness of the product， the higher the economy and practicability. The thinner the wall thickness， the greater the processing cost and opportunity， and the higher the resource cost. Secondly， the process of smooth steel also determines its limitations. Generally，Products Show smooth steel has low precision，Dalas10Cr9Mo1VNb alloy pipeSurface maintenance treatment uneven wall thickness， low brightness inside and outside the pipe， and black spots are not easy to remove. Again pockmarks in the internal appearance， the inspection and shaping need to be processed offline. Therefore， it has its advantages in high pressure， high strength and mechanical structure materials. In the process of use， we will gradually find out. In fact， seamless pipe has also entered the market in recent years. With the growth of market demand， the advantages of seamless pipe have also been stimulated. But there are also many fakes and fake products on the market. Be careful when you choose.
ySan JoseDetermined by the shape，Products Show the section modulus， moment of inertia and corresponding strength of I-beam are obviously better than those of ordinary I-beam with the same single weight. When used in metal structures with different requirements， it shows its superior performance in bearing bending moment， pressure load and eccentric load. Compared with ordinary I-beam， it can greatly improve the bearing capacity and save metal by % ~ %.
Blanking shall be carried out according to the design and site， and then the groove shall be made with a grinder with a groove angle of ° ~ °. Fix the processed pipe on the support， and the gap between the two pipes is mm ~ mm， and then weld.
PFairvanierWhat are the advantages of seamless pipe?
BbThe electric welding reinforcement mesh can reduce the damage and consumption to the reinforcement processing process. According to statistics， after deducting the steel consumption increased by unit lapping， it can also save about % of the steel. After it is transported to the site according to the construction degree of the project，Products Show it can be hoisted to the working face. There is no need to set a reinforcement processing site on the site， which saves the site and increases the management level of the site. At the same time，Dalas10Cr9Mo1VNb alloy pipeSurface maintenance treatment it can also solve the problems of noise pollution caused by straightening reinforcement.
When the mesh reinforcement on both sides of the beam is different， the reinforcement on both sides extends into the beam， and the reinforcement anchorage length is required.
This phenomenon is affected by cooling rate， material composition and heat treatment process. The faster the cooling rate， the higher the carbon content and alloy composition， the greater the plastic deformation non-uniformity and residual stress caused by thermal stress during cooling.
hGenerally， there are many passivation methods for alloy tubes， the common ones are high temperature passivation or sodium cyanide passivation.
MSpiral welded pipe: it is made by rolling low-carbon structural steel or low-alloy structural steel strip into pipe blank according to the viewpoint of certain spiral line (called forming angle)，Reinforcement, galvanized pipe, seamless pipe, welded pipe, alloy pipe, I-beam-Shandong Kaiwen metal material Co., Ltd and then welding the pipe seam. It can produce large-diameter steel pipe with narrow strip steel. Spiral welded pipe is mainly used for oil and natural gas transportation pipeline， and its standard is expressed by outer diameter * wall thickness. Spiral welded pipe has single-sided welding and double-sided welding. The welded pipe shall ensure that the hydrostatic test， we have produced galvanized pipe products for many years. Welcome friends who need to buy.
zNWelded pipe refers to the steel pipe with joints on the surface which is welded after the steel strip or steel plate is bent and deformed into circular， square and other shapes. The blank used for welded pipe is steel plate or steel strip. How can the steel strip or steel plate be welded together， and what are the welding skills?
As long as the pipe material is high-strength alloy steel， including alloy steel pipes with temperature resistance， pressure resistance， wear resistance and low temperature resistance， the welding process shall be focused on preventing the tendency of martensite structure and cracks due to welding high-temperature operation. The general process requirements are that the welding rod shall be selected and baked as required and sent to the welder for use. The oil and water shall be removed before welding on both sides of the weld Rust and sundries shall be removed and cleaned. The welding line energy shall be as small as possible to minimize the swing during the welding process. The arrangement of the last weld shall have annealing effect on the heat affected zone as far as possible. Slow cooling after welding， cover with asbestos cloth， etc.
High percentage of metal strength.
Pursuit of excellenceg Phosphorus: it can significantly reduce the plasticity and toughness of steel， especially at low temperature. This phenomenon is called cold brittleness. In high-quality steel， sulfur and phosphorus should be strictly controlled. On the other hand， low carbon steel contains high sulfur and phosphorus， which can make it easy to cut， which is beneficial to improve the machinability of steel
SThe pickling agent in the pickling process contains many acidic substances， including hydrochloric acid sodium cyanide， etc.， which has strong corrosion and reduction， the corrosion resistance of alloy pipes is specified higher.
Spiral welded pipe: it is made by rolling low-carbon structural steel or low-alloy structural steel strip into pipe blank according to the viewpoint of certain spiral line (called forming angle)， and then welding the pipe seam. It can produce large-diameter steel pipe with narrow strip steel. Spiral welded pipe is mainly used for oil and natural gas transportation pipeline， and its standard is expressed by outer diameter * wall thickness. Spiral welded pipe has single-sided welding and double-sided welding. The welded pipe shall ensure that the hydrostatic test， thick wall steel pipe.
dL The end span plate is connected with the load-bearing wall. The length of the surface mesh extending into the grid support shall not be less than mm and a transverse reinforcement shall be provided at the end of the mesh or the extended reinforcement shall be bent.
Classification by production method