Transformation equipment industry look forward

We will accelerate development, industrial transformation equipment should first improve the independent innovation ability; Secondly to promoting the manufacture level of intelligence; Third, we should improve the level of internationalization.

In the first half of this year, China's machinery industry into the development trend in present steady. Among them, the size of the above equipment industrial added value to achieve steady growth, the shipping industry to achieve better, new energy vehicles continue to maintain rapid growth. Exist at the same time, the export value of declining growth and increasing competition market, the investment demand remains weak, the emerging industry excess risk increased.

Under this background, the development of equipment industry in our country. First of all, we should improve the ability of independent innovation, in addition to choose a batch of equipment manufacturing industry in key regions starting construction national innovation center, to carry out the industry forefront, and the universal key technology research and development, technology transfer, diffusion and commercialization, for the first time to organize the implementation of equipment in major projects and research and industrialization of science and technology projects, argument to start the robot (24.380, 0.02, 0.08%), 3 d printing a batch of newly developed industrial special engineering support, leading enterprises increase investment in research and development, break through the technical bottleneck. Especially to speed up the first (set) of major technical equipment insurance compensation mechanism innovative applications such as policy making and advance, with common use departments to encourage manufacturing enterprise research and development, promote the research and development application.

Second, to enhance the level of intelligent manufacturing. On the one hand, accelerate the pilot demonstration of intelligent manufacturing, and promote intelligent manufacturing in the production process, enterprise management and services, the wide application of energy management, logistics, speed up the development of intelligent equipment and products, promote the integrated application of intelligent manufacturing production mode. On the other hand, speed up to organize the implementation of intelligent manufacturing engineering, intelligent products and independently controlled intelligent device development and realize the industrialization, the construction of key areas of intelligent digital factory, workshop, building intelligent manufacturing standards system and information security protection system, construct platform for intelligent manufacturing network system. Combined with "Internet +" program at the same time, speed up the industrial cloud, a new generation of information technology and manufacturing equipment, such as the Internet integration of integrated innovation and engineering application, construct platform for cooperation, to speed up manufacturing intelligence, transformation of service.

Finally, should raise the level of internationalization. Not only to strengthen the international equipment manufacturing industry cutting-edge technology, science and technology cooperation project tracking, encourage the equipment manufacturing industry innovation center pilot mergers and acquisitions of foreign innovation resources, cooperate with international counterparts to carry out substantial research and development and innovation; To speed up the implementation of the state council "about promoting international capacity and equipment manufacturing cooperation guidance, strengthen the national equipment manufacturing industry innovation center with foreign enterprises, research institutions and international organizations in low carbon manufacturing standards and intellectual property extensive international technology exchange and economic cooperation. Especially to support guide domestic advantage equipment enterprises to "neighbourhood" all the way along the countries and regions as the key point, promote the rail transportation equipment, power equipment, petrochemical, metallurgy equipment, automobile, engineering machinery, agricultural machinery, aviation equipment, ship and ocean engineering equipment, and other fields to carry out the project cooperation, overseas m&a, set up overseas research and development center and JingMao District construction, continue to promote the equipment manufacturing industry "going out".

Steel Industry will develop on a better road!

Technical of Q345B Hollow section

Q345 steel containing certain alloy elements and carbon equivalent value is 0.39%, has certain hardening tendency, in the big plate and the cooling speed too fast under the condition of welding, prone to cold crack. When, in addition, the major technical parameters of welding heat input is too big, easy to cause the hot cracking formation of weld or thermal strain in heat affected zone embrittlement. In terms of the structure of weldment, rectangular tube length and cross section is large, thin rod type, complex welding deformation and deformation easily in the process. Therefore, the welding deformation control become a difficult problem.

1. The scheme of rectangle tube compound

To meet the requirements of strength, the rectangular tube cross section size is 300 mm * 200 mm, thickness of 3 mm, design requirements for the distortion and parallelism deviation 1.2 mm or less, production technology is difficult. Therefore, through the investigation and study, sheet Yun eventually determine the use of symmetric two half bent into a trough and shell, and then USES the manufacturing technology of CO2 gas shielded welding welding.

2. The welding process

(1) open V groove symmetrical trough two and a half to help large bending machine press forming, according to the technological requirements processing butt welding groove, the reserved clearance. The design of the welded joint is a weak link in the welding engineering. To control the internal quality of weld and welding groove form structure manufacturing quality has a very important role. Groove design must consider the fusion than parent metal, welding space, welding position and comprehensive economic benefits. Should press type calculation of transverse shrinkage value Δ B.

Δ B = 5.1 A omega/delta + 1.27 d

Type in A omega - weld cross-sectional area, mm; The delta - thickness, mm; D - weld root gap, mm.

Find Δ B and A relationship between omega can list according to the relationship between analysis, data processing, optimization design, after the Yun rectangular pipe butt weld groove form

(2) to control the welding deformation of the rectangular tube because of its shape as part of the thin rod, thus the welding deformation is very difficult to control. The welding deformation of the main deflection (bending), lateral bending, angular distortion and distortion, etc. For the rectangular tube, is the main deformation of the lateral contraction, the rectangular section size affected, each side should be indented reserved clearance around 90%; After weld transverse contraction, inward bending on both ends of the vertical plate, make component form waist drum shape; More heat input, due to the weld section, inevitably cause larger longitudinal contraction, the component in the length direction deflection; For welding distortion caused by the unreasonable correction is very difficult and sometimes have to cut open welding or whole scrap.

From the welding deformation theory, the main factors influencing the size of the welding deformation is: the weld dimension, the greater the deposited metal, the more the greater the deformation; Weld size is equal, weld heat input, the greater the deformation caused by the greater; Large weld, the welding section than through welding deformation is smaller; Weld layout asymmetric or symmetric but not welding, weld position deviation, the greater the deformation; Artifacts rigidity is smaller, the greater the deformation.

Welding specification through process test and analysis, to determine the rectangular pipe butt weld using double CO2 gas shielded welding. Welding material with H08Mn2SiA, 1.2 mm wire; Protection for pure CO2 gas. The first layer seam welding current of 200 ~ 250 a, the second is 240 ~ 320 a. The arc voltage is 24 ~ 26 v. Must process requirement is: the first layer of weld penetration, guarantee on the back of the forming good; Welding current, arc voltage, welding speed and wire feed speed can be adjusted according to equipment model.

Welding sequence in order to reduce the deformation, rectangular butt welding welding sequence should be in accordance with the following principles: take from middle to both sides layered piecewise symmetric skip welding, the welding deformation is smaller than direct welding, is advantageous to the stress dispersion and release, avoid complex stress in the weldment. Through swing welding, welding formed by the start of a narrow plastic deformation zone only once, and due to the continuous swing welding, large amount of heat input, large heating area, by the compression plasticity deformation area is big, so after welding contraction deformation is very large. Hierarchical block skip welding, cross section of each layer are small and the required quantity of heat is small, and each layer is divided into several segments skip welding, every welding a largely re-established on the cold plate temperature field at a time, every time a narrow plastic deformation zone, and the plastic deformation area average width (i.e., the size of the transverse shrinkage) is smaller than corresponding layered through welding, longitudinal contraction is small, compared with the direct continuous fill a swing welding deformation is smaller.

Based on the above analysis, the first jump from middle to both ends segmented weld 1 (see figure 1), the first layer flip jump from middle to both ends segmented weld 2 layer, the first weld 2 should be larger than the weld 1 welding specification, to produce a larger reverse force, make the original deformation correction. Then again in the same way the welding seam 1 second and weld 2 tier 2.

Hope you could understand more about Q345B hollow section.

Surface treatment of ERW steel pipe

With the sustainable development of economy in our country, the country to vigorously develop the energy industry, long distance oil and gas pipeline is an important means of energy security, in the process of oil (gas) pipeline anticorrosion construction, steel tube surface treatment is one of the key factors determine the service life of the pipeline corrosion, it is a solid combination of anti-corrosion layer and steel tube can be provided. Verified by research institutions and the life of the coating depends on the quality of coating types, coating and environmental factors such as construction, steel tube surface treatment effects on coating life accounted for about 50%, therefore, should be in strict accordance with the specification on the coating on the surface of steel pipe requirements, continuously explore and summary, continuously improve steel pipe surface treatment.

Types of structural steel pipe

Many variable factors said erosion medium characteristics, the chemical product and its concentration, atmospheric conditions, temperature, time, so if do not understand the nature of the medium accurately, it is difficult to use of materials, select materials. However, the following can be used as a selection guidelines of structural steel pipe:

The type 304 throughout the use of materials. Of corrosion in the building can withstand, can resist food processing medium erosion (but with concentrated acid and chloride composition state of high temperature erosion may occur), can resist organic compounds, dyes, and in all kinds of inorganic compounds.

304 l (low carbon), nitric acid resistance is good, and durable medium temperature and the concentration of sulfuric acid, throughout the land used for liquid gas storage tank, instruments used for cryogenic equipment (304 n), the rest of the consumer products, kitchen equipment, hospital equipment, transportation, handling device wastewater.

Type 316 a little more than 304 type contains nickel, and molybdenum containing 2% ─ 3%, the corrosion resistance is better than 304 type, special is in tend to cause some erosion of chloride medium. Type 316 has been used as a sulfite pulp machine, because it is durable sulphate. And, its use has to deal with a lot of chemical products in the processing industry.

Type 317 containing 3% - 4% of molybdenum (in this series is of high level), and contains more than 316 type of chrome, has higher resistance to erosion and the erosion of the aperture function.

Type 430-430 type alloy content is low, as in a warm atmosphere high polishing decoration purposes, also used for nitric acid and food processing equipment.

Type 410 has the lowest in the three kinds of general purpose stainless steel alloy content, need strength and corrosion resistance with Gao Cheng force components used, such as strong. Type 410 in warm atmosphere, hydrosphere and many moderate chemical corrosion product of medium.

2205 type 304 type and 2205 type is advantageous, because the structure of the tube he to have high resist chloride stress corrosion crack force.

More information,pls visit:Hunan great steel pipe co.,ltd

Descaling grade

Descaling grade 4.1

Commonly used for carbon steel pipe, vinyl, epoxy phenolic anticorrosive coatings, such as the construction process, generally require steel tube surface is nearly white level (Sa2.5). Practice has proved that using the descaling grade removes almost all of the scale, rust and other debris and anchor pattern depth of 40 ~ 100 microns, and fully meet the requirements of anti-corrosion layer and steel adhesion, and shot derusting spray (cast) process can be used with low running cost and stable and reliable quality level to nearly white (Sa2.5) technical conditions.

4.2 spray (cast) shot abrasive

In order to achieve ideal cleaning effect, should according to the degree of hardness on the surface of the steel tube, the original corrosion, requirements of surface roughness, coating types to choose abrasive, for single layer, layer or three layer PE coating epoxy, using a mixture of steel shot and steel grit grinding are more likely to achieve ideal cleaning effect. Steel pill have the effect of the reinforcement steel surface, and it has steel grit etching on the surface of the steel. Steel shot and steel grit mixed abrasive (usually for 40 ~ 50 HRC hardness steel shot, steel grit of hardness of 50 ~ 60 HRC can be used for all kinds of steel surface, even in the class C and D corrosion of coating steel pipe surface, cleaning effect is very good also.

4.3 abrasive particle size and proportion

In order to obtain better uniform cleanliness and roughness distribution, ratio of abrasive particle size and design is quite important. Too much of the anticorrosive coating roughness in rush bum thin anchor lines; At the same time as the anchor lines too deep, in the process of anticorrosion coating is easy to form bubbles, serious impact on the performance of anticorrosive coating.

Roughness is too small will cause the loss of coating adhesion and impact resistance strength. For serious internal pitting, not only by the larger particles impact abrasive high strength, must also be polished away by small particles corrosion products to achieve clean effect, at the same time, reasonable proportioning design not only can slow the abrasive wear of pipeline and spray nozzle (blade), and the utilization of abrasive can be greatly improved. Usually, the particle size of steel shot 0.8 ~ 1.3 mm, steel grit size is 0.4 ~ 1.0 mm, with 0.5 ~ 1.0 mm as main ingredients. Sand shot than the average of 5 ~ 8.

It should be noted that in practice, steel shot and steel grit in grinding ratio is very difficult to achieve the ideal, the reason is hard and brittle than steel grit steel shot and broken rate is high. To this end, sampling test should be continuously mixed abrasive in the operation, according to the particle size distribution, to adding new abrasive cleaning machine, and mixing in a new abrasive, the number of steel shot to account for the main.

4.4 rust removal rate

Steel tube derusting speed depends on the type of abrasive and abrasive displacement, generally should choose low attrition rate of abrasive, so clear to improve speed and long blade life.

4.5 cleaning and preheating

Before spray (cast) shoot processing, adopt the method of cleaning to remove oil on the surface of the steel tube and fouling, the heating furnace for preheating tube body a 60 to 40 ℃, the steel pipe surface dry state. In spray (cast) processing, due to steel tube surface oil free of dirt, can strengthen the effect of cleaning, drying of the surface of the steel tube also is helpful for steel shot, steel grit and the separation of rust and scale, make after cleaning of structural steel pipe surface clean.

Emphasis on the importance of surface treatment in the production, strictly control the descaling process parameters, in actual construction, the steel pipe anticorrosion layer of the peel strength value of more than standard requirements, to ensure the quality of the anticorrosive coating, on the basis of the same equipment, improve the technological level, reduce the production cost.

High pressure boiler steel tube

High pressure boiler tube knowledge - high pressure boiler tube: mainly used in the manufacture of high pressure and over pressure steam boiler pipes, etc. With high quality carbon structural steel, alloy steel and stainless heat resistant steel seamless steel tube, the boiler tube by the party under high temperature and high pressure pipe and works in high temperature flue gas and steam will happen under the action of oxidation and corrosion, so the steel pipe with high rupture strength, high oxidation resistance, and have good organizational stability, using steel grade are: high quality carbon structural steel grade 20 g, 20 MNG, 25 MNG; 15 mog, alloy structural steel steel grade 20 crmog mog, 12, 15 crmog, 12 cr2mog, 12 crmovg, 12 cr3movsitib, etc; Heat resistant steel rust cr18ni9, 1 cr18ni11nb commonly used high pressure boiler tube, in addition to ensure that the chemical composition and mechanical properties to do hydrostatic test by the root, flaring, flattening test. Steel tube to heat treatment state delivery. In addition, the microstructure and grain size of finished steel pipe, the decarburization layer also has certain requirements. Geological drilling and oil drilling with seamless steel tube; Proven underground strata structure and groundwater, oil, gas and mineral resources, make use of the rig drilling Wells. Mining more from drilling, oil and gas geological drilling in oil drilling in seamless steel pipe is the main drilling equipment, mainly including core tube, core tube, casing, drill pipe, etc. Due to the drilling pipe to go deep into the thousands of meters formation depth work, working conditions is very complex, drill pipe under pull, pressure, bending, torsion and uneven impact load stress, but also by mud, rocks and wear, therefore, requires tubing must have sufficient strength, hardness, wear resistance and impact toughness, steel pipe steel with "dz" pinyin "(geology) plus number one on behalf of the steel yield point, said common steel grade dz45 MNB 45, 50 mn; Dz50 40 mn2, 40 mn2si; Dz55 40 mn2mo, 40 MNVB; 40 mnmob dz60, dz65 27 mnmovb. Steel pipe is a heat treatment state delivery. Petroleum cracking tube: used in oil refinery furnace tube, seamless tube heat exchanger tube and pipe. Commonly used high quality carbon steel (10, 20), alloy steel (12 crmo, 15 crmo), heat resistant steel (12 cr2mo, 15 cr5mo), stainless steel cr18ni9 (1, 1 cr18ni9ti) manufacturing. Steel pipe except to the chemical composition and various mechanical properties, and ensure that the water pressure, flattening, flaring test, and the surface quality and nondestructive inspection. Steel pipe in heat treatment state delivery. Stainless steel pipe: with all kinds of stainless steel hot rolling and cold rolling stainless steel tube, pipe is widely used in petroleum, chemical industry equipment and various USES of the stainless steel structural parts, in addition to ensure that the chemical composition and mechanical properties, all steel pipe is used as the fluid under pressure to keep the water pressure test. All kinds of special steel pipe to guarantee conditions by the regulation.

Difference of LSAW and SSAW

Straight seam steel pipe and spiral steel pipe is a kind of welded steel pipe, they are widely used in the construction of national product, straight seam steel pipe and spiral steel pipe due to the different production process has many differences, therefore, the following specific issues about the difference between straight seam steel pipe and spiral steel pipe. Straight seam welded pipe production technology is relatively simple, the main production process with high frequency straight seam welded steel tubes and submerged arc welding and straight seam steel pipe, straight seam pipe production with high efficiency, low cost, rapid development. The strength of the spiral welded pipe is generally higher than straight seam welded pipe, the main production process is submerged arc welding, spiral steel pipe can use the same width of different diameter welded pipe billet production, can also use a narrower billet production of larger diameter welded pipe. But compared with the same length of straight seam pipe, weld length by 30 ~ 100%, and the production speed is low. As a result, a small diameter welded pipe are mostly with straight seam welding, large diameter welded pipe for the most part adopts spiral welded. They have been used in the industry production of straight steel tube located at a t-shaped welding technology, the short sections of straight seam steel pipe for docking, the length of the connect accords with the need of engineering, t the probability straight seam welded steel defect is greatly improved, and the t-shaped seam welding residual stress is larger, the stress state of the weld metal are often in a three to increase the possibility of a crack.

Oil Well Pipe

At present, China's domestic market share of oil well pipe has been more than 80%, and 2 years in a row as net export products. In regard to the development of varieties, many domestic enterprises innovation, not only produced according to the requirement of API standard K, N, C and P steel casing, also according to user requirements developed with independent intellectual property rights of the series of casing, such as tianjin steel tube company developed a TP series the collapse resistance of casing, casing corrosion resistance, resistance to high temperature thermal recovery Wells with casing, ultra deep well with button and special gas tightness casing pipe, including TPl30TT high collapse casing its collapsing strength reached more than 167 mpa. TPll0TSS high collapse casing corrosion resistance in 5% sodium chloride, acetic acid, 5% of oxidation corrosion in the solution, 720 hours not broken; TP140V casing under the well depth of 6936 meters (the recent record will be broken). A NC 3 cr co2 corrosion resistance casing has batch sent to tarim oilfield well use. Baosteel, chengdu seamless also have developed their own products. Although Chinese seamless steel tube industry in the oil well pipe has made remarkable achievements, but in some high-end product development there is no pass, such as 13 cr, super 13 cr steel inclusion and control the content of S and P (S less than 10 PPM, P is less than 15 parts per million (PPM), the performance of the heat treatment control, and thread processing of quality control still exist a series of problems, such as flexible tubing, the development of the expansion casing is still blank.

Line steel Pipe

With the development of the pipeline steel plate technology and the progress of welded pipe forming, welding technology, the application range of the pipe with welded pipe in gradually expanding, especially in the large diameter welded pipe class scope advantages more apparent, and cost factor, welded pipe has been dominant in the field of line pipe, which limits the development of the seamless line pipe. In 2007 domestic seamless line pipe, mainly including X42-70 in steel grade, varieties have a land line pipe and seabed pipeline. Production of high grade pipeline pipe currently USES micro alloying heat treatment process, the cost of production of seamless tube was obviously higher than that of welded pipe, and with the improvement of steel grade, such as the above X80 grade pipeline steel tube limits on carbon equivalent, seamless steel tube of conventional technology is difficult to meet user requirements; Currently all seamless steel tube plant in order to improve the line pipe corrosion resistance, the use of stable performance and low temperature, high temperature environment to carry out the scientific research work.