Easy material tubes are divided into two forms: hot-rolled and cold-rolled (dial) seamless material tubes. Hot-rolled smooth material pipes are divided in to general steel pipes, minimal and moderate pressure boiler steel pipes, large pressure boiler steel pipes, metal material pipes, stainless pipes, oil breaking pipes, geological material pipes and different material pipes. Cold rolled (dial) seamless metal pipes are divided in to basic steel pipes, reduced and moderate pressure boiler metal pipes, high stress boiler material pipes, combination metal pipes, metal pipes, petroleum breaking pipes, and different metal pipes, as well as carbon thin-walled metal pipes, mix thin-walled material pipes, Stainless thin-walled metal pipes, special-shaped material pipes. The external size of hot-rolled smooth tube is usually more than 32mm and the wall width is 2.5-75mm.

The outer height of cold-rolled smooth pipe could be up to 6mm and the wall depth may be around 0.25mm. The external height of thin-walled pipe may be up to 5mm and the wall width is less than 0.25mm. Moving has higher dimensional accuracy than hot rolling.

Usually, seamless steel pipes are made of 10#, 20#, 30#, 35#, 45# and different supreme quality carbon steels such as for instance 16Mn, 5MnV and other low-alloy structural steels or 40Cr, 30CrMnSi, 45Mn2, 40MnB and other blend steels which can be hot-rolled or cool Rolled. 10#, 20# and other low-carbon metal seamless pipes are mainly employed for water transportation pipelines. Easy tubes made from moderate carbon metal such as for instance 45 and 40Cr are accustomed to production technical components, such as for example stressed parts of automobiles and tractors. Generally, seamless metal pipes ought to be employed for strength and trimming tests. Hot-rolled material pipes are provided in hot-rolled state or heat-treated state; cold-rolled metal pipes are delivered in heat-treated state.

The hot-rolled easy steel pipe features a high temperature, a tiny deformation weight, and a wide range of deformation. Getting the going of material dish for example, the depth of the continuous casting billet is usually about 230mm, and following rough going and finishing coming, the final thickness is 1-20mm. At the same time frame, as a result of little width-to-thickness rate of the metal plate, the dimensional reliability requirements are somewhat reduced, and the form problem is not prone to occur, and the top is especially controlled. Certain requirements for the framework are generally reached through controlled going and chilling, that is, handling the opening temperature, final coming temperature and coiling temperature of finishing coming to manage the microstructure and mechanical attributes of the strip.

Ideas: ASTM A53 covers seamless and welded material tube with nominal wall thickness. The outer lining condition is normally dark and hot-dipped galvanized. ASTM A53 is made mainly for stress and mechanical purposes, and can be useful for transfer of steam, water, gasoline line pipes.

Carbon steel slightly larger compared to density of ferrite and martensite stainless human body,Guest Publishing and somewhat lower than that of austenite size stainless steel; Resistivity in accordance with carbon steel, metal, wheat size, shape and austenite martensite stainless steel increasing organizing; Linear expansion coefficient of how big the same kind, minimal austenite measurement highest stainless steel and carbon material; Carbon steel pipe, metal, wheat measurement and martensite stainless magnetic, austenite measurement non-magnetic metal, but their cold hardening made into austenite phase modify can make a magnetic, can be utilized temperature therapy method to eliminate the martensite framework and restore their non-magnetic.

Weighed against metal and carbon material, austenite measurement has these characteristics:

1) large electrical Yin rate, which will be about 5 situations of carbon steel.

2) linear expansion coefficient, 40% larger than carbon metal, and with the improve of heat, the linear expansion coefficient value also correspondingly improved.

3) reduced thermal conductivity, that will be about 1/3 of the carbon steel.

Both stainless and temperature resisting metal, austenite size the best detailed houses of steel menu, have sufficient energy, and has exemplary plasticity and hardness is not large also, this really is also one of the reasons they're widely used. Austenite stainless steel measurement with a large proportion of other related metal resources, the tensile strength to lessen slowly, there's number fragile move temperature. Therefore stainless steel at reduced heat may keep enough plasticity and toughness.

The duplex metal is in their strong quenching organization ferrite and austenite facies each half, common minimum stage content may be as high as 30%.

As a result of top features of the 2 period, with correct control of compound structure and temperature treatment method, make the DSS has the advantages of ferritic stainless and austenitic stainless steel.

Compared with austenitic metal, the advantage of duplex stainless is as follows:

1) the produce strength is significantly more than doubly large as regular austenitic metal, and has enough plastic molding require toughness. Using the duplex metal storage container and stress vessel wall thickness compared to generally used austenitic lower 30-50%, reducing the cost.

2) has outstanding resistance to strain deterioration cracking capacity, also the best of duplex stainless mix content than austenitic stainless features a larger resistance to tension corrosion breaking power, specially in the environment of the chlorine ion. Stress deterioration is popular austenitic stainless steel is hard to resolve the remarkable problems.

3) probably the most generally found in several medium of 2205 duplex metal deterioration resistance is more advanced than the ordinary 316 m austenitic stainless steel, and super duplex metal has large rust weight, and then some moderate, such as for instance acetic p, formic acid and etc can also change austenitic stainless, large mix and deterioration immune alloy.

4) includes a great opposition to regional deterioration efficiency, compared to the combination content quite austenitic metal, its wear opposition rust and corrosion weakness performance surpasses that of austenitic stainless steel.

5), lower than the linear expansion coefficient of austenitic metal and carbon material, ideal for joining with carbon metal, has important executive significance, such as for instance Máy sấy công nghiệp of blend sections or coating, etc.

6) no matter under the condition of energetic fill and static fill, than austenitic stainless has higher energy absorption capacity, the structure to deal with sudden incidents such as for instance collision, explosion, etc., apparent benefits, duplex metal has sensible request value.