For the steel pipes bearing fluid pressure, hydraulic test shall be carried out to test their pressure resistance and quality. If there is no leakage under the specified pressure, or they are qualified. Some steel pipes shall also be subject to crimping test, flaring test and flattening test according to the standard or the requirements of the demander.
SPCDSPCD—& mdash; Cold rolled carbon steel sheet and strip for stamping, equivalent to China 08Al (1323) high quality carbon structural steel.
.The operators are mainly plumbers and argon arc welders, with the cooperation of other types of work, which is widely used in many media, is better than that of ordinary l austenitic stainless steel, while super duplex stainless steel has very high corrosion resistance. In some media, such as acetic acid and formic acid, it can even replace high alloy austenitic stainless steel and even corrosion resistant alloy.
.The design shall be carried out according to the soil, grooved section, load conditions and other factors of the trench, which shall be firm and reliable to prevent collapse and support, and shall not hinder the pipe laying and pipe stabilization.
SPCCSPCC—& mdash; Cold rolled carbon steel sheet and strip are generally used, which is equivalent to q195a. The third letter C is the abbreviation of cold. When it is necessary to ensure the tensile test, add t at the end of the brand as spcct.
The competition in stainless steel pipe industry is fierce and gradually intensified. With the flood of fresh brand blood and the downturn of market economy, the development of stainless steel pipe manufacturers is faltering. However, it can be seen from some relevant data that the overall market potential is still great. Stainless steel pipe connection manufacturers should know how to proceed step by step and make steady progress in order to have a chance to win the market.
The Chinese brand of stainless steel plate is 0cr18ni12mo3ti (0Cr18Ni12Mo2Ti with paper should also be this brand). The new brand is 06cr17ni12mo2ti stainless steel plate. The stainless steel plate is added with Ti in SUS316 steel to improve the intergranular corrosion resistance. It is applied to the equipment of, phosphoric acid, acetic acid and acetic acid.
It has the characteristics of high efficiency and low cost. At the same time, it can also well ensure the welding quality (in the capacity expansion and reconstruction project of Urumqi petrochemical, we use this method to weld 28 joints and repair joints, with a one-time qualified rate of welding), which is worthy of our use.
In addition to stress corrosion resistance professional stainless steel plate, stainless steel coil, stainless steel belt and stainless steel pipe have stable, safe and reliable performance and can be maintenance free. The technical level has reached the domestic level and the advanced level of similar international products. Other local corrosion resistance properties are better than ferritic stainless steel.
Respect for customers.The compressive strength of duplex stainless steel alloy is twice that of austenitic stainless steel. Compared with L and 317L, the designer can reduce its weight. Alloy is especially suitable for & mdash; 50° F/+600° F temperature range, in strict cases (especially for welded structures), it can also be used for lower temperatures. C≤ 0.030 Mn≤ 00 Si≤ 00 p≤ 0.030 S≤ 0.020 CR 20 ～ 20 Ni 5 ～ 5 mo0 ～ 5 n0.14 ～ 0.20 (AUSTENITIC FERRITIC type)
Among the steel products exported by China steel pipe has always been the focus of foreign anti-dumping and countervailing investigations. The Russian Ministry of industry and trade announced an anti-dumping investigation on China's cold-rolled stainless steel seamless steel pipes exported to the Russian Belarus Kazakhstan customs union. Before that, the Brazilian foreign trade chamber also said that it would impose an anti-dumping tariff of US $743 per ton (about RMB 4748 yuan) on China's steel pipe products, which is valid for five years.
The effect of different stabilizers on the stability of ferritic stainless steel during pickling in base solution was studied by means of weight loss curve and scanning electron microscope. The results show that under the experimental conditions, both complex stabilizer HF and adsorption complex stabilizer 5-sulfosalicylic acid can completely remove the oxide layer on the surface of stainless steel The effect of adsorbing complex stabilizer 5-sulfosalicylic acid is obviously better than that of complex stabilizer HF in the stability effect and the flatness of the research results on the properties and microstructure of stainless steel surface s stainless steel pipe after pickling. The deformation behavior at high temperature at 100 ℃ and strain rate of 0.01 ~ 5 s-1. The rheological stress curve is drawn according to the compression experimental data; based on Arrhenius relationship and considering the strain Factor, an improved constitutive equation coupled with strain factor is established; combined with optical microscope (OM) The characteristics of microstructure during material deformation are observed; the dynamic recrystallization critical strain of L stainless steel is determined according to the work hardening rate flow stress curve, and the dynamic recrystallization volume fraction model is established based on the s stainless steel pipe equation. The results show that in the process of thermal deformation of s stainless steel pipe, the flow stress corresponding to lower temperature and faster strain rate is also large; the coupling of stress variable factors The correlation coefficient between the rheological stress of the constitutive model s stainless steel tube and the experimental value is 0.986 88, and the average relative error is only 6%. The model can better predict the deformation resistance of L stainless steel during thermal deformation. The dynamic recrystallization behavior of s stainless steel tube is easy to occur under the processing conditions of high temperature and low speed and its dynamic recrystallization volume fraction and strain change in S shape. The value obtained by the model is consistent with the experimental data The volume fraction of dynamic recrystallization of s stainless steel tube during hot working can be well. Dense palladium membrane was prepared on porous stainless steel substrate with pore size of 5 & mu; m by electroplating and the combination of the two. The palladium membrane on the surface of porous stainless steel was characterized by seeds and XRD. The results show that the pretreatment is completed with 0.1 GL PdCl2 solution A pure palladium film can be prepared by electroless plating of porous stainless steel and electroplating with palladium ammonia solution with palladium content of 17 GL, 36 kinds of wall thickness of 5 ~ 45mm
There are 45 kinds of hot rolled (hot) steel pipes with a diameter of 54 ~ 480mm, 65 kinds of cold drawn (rolled) steel pipes with a diameter of 6 ~ 200mm and 39 kinds of wall thickness of 0.5 ~ 21mm.
Direct material.L stainless steel pipe is a kind of hollow long round steel, which is mainly used for industrial transmission pipelines and mechanical structural components such as petroleum, chemical industry, medical treatment, food, light industry, machinery and instruments, the weight is light, so it is also widely used in all kinds of manufacturing mechanical parts and engineering structures.
The main control load of the platform has high requirements for the shear bearing capacity of the guide leg of the offshore platform. In order to study the factors affecting the shear capacity of the jacket legs of the stainless steel pipe in pipe concrete-filled steel tubular offshore platform, a total of 18 concrete-filled steel tubular shear members were fabricated to study the effects of outer steel pipe material, concrete strength, void ratio and shear span ratio on the shear capacity of concrete-filled steel tubular in pipe. It is found that the shear strength of members increases with the decrease of void ratio and the increase of concrete strength; The larger the shear span ratio, the smaller the shear strength. Combined with the test, the empirical formula of shear capacity of concrete-filled steel tubular in pipe is proposed, which is analyzed and verified by ABAQUS finite element modeling software. The results show that the simulation is in good agreement with the test results. In order to study the axial compression performance of stainless steel tube concrete conduit leg and the axial compression performance of stainless steel concrete conduit leg, experiments are used to verify the correctness of the finite element model. The load displacement curves of 19 specimens in 5 groups were compared, and the effects of different void ratio, concrete strength, diameter thickness ratio and bone index on the axial compression performance of concrete-filled stainless steel tubular short columns under axial compression were analyzed. The results show that with the increase of concrete strength, the bearing capacity of specimens increases, but the ductility of specimens decreases; With the increase of void ratio and diameter thickness ratio, the bearing capacity of the specimen decreases; The bearing capacity of stainless steel tube concrete can be effectively improved by adding steel bone; Increasing the bone matching index of steel bone can improve the bearing capacity of the specimen. Based on the jacket offshore platform, it is proposed to replace the four hollow steel conduit legs of the original offshore platform with concrete-filled steel tube in stainless steel tube to form a new composite offshore platform with concrete-filled steel tube in stainless steel tube, so as to improve the ice resistance and disaster prevention ability of the offshore platform. The 110 scale test on the offshore platform shows that the composite offshore platform of concrete filled steel tubular in stainless steel pipe (hereinafter referred to as the composite offshore platform) has better anti icing performance than the ordinary jacket offshore platform. Taking push3 as an example, the peak acceleration and displacement of the upper deck of the composite offshore platform of concrete filled steel tubular in stainless steel pipe are reduced by 12% and 240% respectively. The analysis of ABAQUS finite element and experimental simulation results shows that the error of the two results can be basically within 15%. Through the simulation analysis of the ultimate bearing capacity of the stainless steel tube in tube concrete-filled steel tubular composite platform and the original offshore platform, it can be seen that the stainless steel tube in tube concrete-filled steel tubular composite platform has stronger ultimate bearing capacity. Therefore, the composite offshore platform of concrete-filled steel tube in stainless steel tube is a good new type of jacket offshore platform. Axial compression tests were carried out on 9 austenitic and 9 duplex stainless steel tube concrete short columns. The ultimate load, longitudinal strain and circumferential strain of the short columns under axial compression were measured. The effects of steel tube wall thickness and concrete strength on the bearing performance of the short columns were investigated. Reference was made to the European Code for design of concrete filled steel tubes (Eurocode), American code (ACI 318-9) and Japanese code (aij-cft) China's relevant regulations D 13-51-200dlt5085-1999 and CECS 282012 calculate the preparation of stainless steel pipe construction, prepare construction scheme and construction schedule scheme, prepare corresponding materials and tools, and check whether they match and apply.
.Since the invention of stainless steel at the beginning of this century, stainless steel has integrated the image of modern materials and the excellent reputation in architectural applications, which makes its competitors envy. Stainless steel will not produce corrosion, pitting, corrosion or wear. Stainless steel is also one of the metal materials with high strength. Because stainless steel has good corrosion resistance, it can keep the integrity of engineering design of structural components. Chromium containing stainless steel also integrates mechanical strength and high extensibility, which is easy to process and manufacture parts, and can meet the needs of architects and structural designers.
The competition in stainless steel pipe industry is fierce and gradually intensified. With the flood of fresh brand blood and the downturn of market economy, the development of stainless steel pipe manufacturers is faltering. However, it can be seen from some relevant data that the overall market potential is still great. Stainless steel pipe connection manufacturers should know how to proceed step by step and make steady progress in order to have a chance to win the market.
It will not rust, but improper use and maintenance will cause & ldquo; Floating rust& ldquo; Mildew & rdquo; And other undesirable phenomena.