Although China has just begun to implement the fifth phase of vehicle fuel (national five) standards, the implementation of the sixth phase of vehicle fuel (Six) standards has begun to count down. Recently, a reporter from Beijing Daily News learned that Beijing Municipal Environmental Protection Bureau has confirmed that Beijing will implement the Sixth National Standard on January 1, 2017. According to the plan of the Ministry of Environmental Protection, the domestic timetable for the implementation of the National Sixth Standard in stages is set for 2020. In the industry, it is widely believed that the National Sixth Standard means that the auto companies' existing models have been fully upgraded, and the auto makers are facing the pressure of rising vehicle costs. At present, the implementation of the National Five Standards has made it difficult for some independent auto makers to parry. Once Beijing implements the Sixth National Standard, some auto companies will inevitably choose to “temporarily withdraw†from the Beijing market. It is understood that Beijing Municipality took the lead in implementing the second, third, fourth and fifth stages of local oil standards in 2004, 2005, 2008 and 2012. Compared to the four-year preparation period for the country’s five-year upgrade, the six-nation standard has been reserved for companies for less than three years. The intensive upgrading of emission standards has already begun to allow car companies to “eat too muchâ€. A person in charge of research and development at a car company revealed that the emission standards have been upgraded, and at least a few hundred million yuan in R&D and inspection investment will be required for companies. Not only does it require a reserve of technology, it also takes at least a year for the product to upgrade from output to certification. The data show that compared with the National Five Standards, the National Sixth Standard not only changed the type I test cycle, but also tightened the pollutant emission limits, increased the measurement requirements for the emission of particulates from gasoline vehicles, and introduced the “real†requirements of Euro VI standards. Driving Emission Test (RDE). At the same time, the new emission standards are also more stringent in terms of emission limits for pollutants, which increases the control requirements for pollutants in the refueling process. It is expected that after the use of the sixth stage oil products, particulate emissions from gasoline vehicles will decrease by 10%, non-methane organic gases and nitrogen oxides can achieve an overall reduction rate of 8% to 12%; nitrogen oxide emissions from diesel vehicles will decrease. At 4.6%, particulate matter decreased by 9.1%, total hydrocarbons decreased by 8.3%, and carbon monoxide decreased by 2.2%. Faced with the improvement and upgrading of the overall system, the R&D of new vehicles will be severely tested on time and cost. Zhang Zhiyong, a veteran automotive industry commentator, believes that as China VI draws on Euro VI standards, it is relatively easy for the joint venture car companies to improve and upgrade their technology reserves. However, for self-owned brand car companies, it is very likely that there will be another embarrassment in the implementation of the National Five Standards, and some models will not be able to sell in areas that are ahead of the implementation of the National Sixth Standard because they do not meet the emission standards. In fact, prior to the upgrading of the National Five Standard, a car only increased the cost of 1,000-2,000 yuan. Although it is still unclear how much additional equipment will be added if the S6 standard is not finalized, the industry expects at least 10% more cost per vehicle. In addition to cost pressures, shorter preparation times also put auto companies at risk. According to the regulations of the Ministry of Environmental Protection, the date for the implementation of the National Five Standard across the country is January 1, 2017, which is less than two months from now. The current situation of the Beijing Commercial Daily reporter is that some auto brands have just completed a full upgrade. This also means that five years after the implementation of the National Five Standards in Beijing, the technical reserves and R&D of some domestic car companies are all lagging behind. It is worth noting that this time from the beginning of the implementation of the National Standards in Beijing to the national standard of six, leaving only less than three years for car companies. At the same time, the introduction of the Sixth National Standard will inevitably accelerate the exit of vehicles that comply with the National Five Standards. This undoubtedly makes the domestic auto companies that have just completed the upgrade of the National Five Standards feel pressured under the background of weak technology and shortage of funds. Zhang Zhiyong believes that at present, under the pressure of environmental protection, the world is upgrading emission standards. Mitsubishi and other multinational car companies have also fallen into the predicament of counterfeiting due to the pressure of emission standards this year. Domestic implementation of the Sixth National Standard will inevitably put pressure on companies. However, this cannot be an excuse to evade the upgrading of emission technologies. The entire industry will face a new round of market tests in the future.
Longitudinal Pipe is a Steel Pipe, weld steel pipe means parallel to the longitudinal pipe. Classified by the wall thickness of thin-walled and thick-walled straight seam pipe straight seam pipe; according to shape classification round pipe, square shaped tube or pipe; there are generally classified by use pipe, galvanized pipe, oxygen blowing pipe, wire casing, metric pipe, roller tube, deep well pump tube, automotive tube, transformer tube, welding thin-walled tube, welding shaped tube and spiral welded pipe.Straight tube refers to weld and pipe longitudinal parallel. Generally known as welded pipe or pipe. The Straight Pipe is through the high frequency welding strip steel coiling unit will be of certain specifications and with longitudinal welded. Straight pipe specifications with nominal diameter, the wall thickness can be divided into thin-walled straight tube and a thick wall straight seam pipe two. According to the shape can be divided into round, square or shaped tube, etc..
Classification of welded pipe materials and uses
GB/T3091-1993 (galvanized Welded Steel Pipe for low pressure fluid delivery). Mainly used for conveying water, gas, air, oil and heating hot water or steam and other generally low pressure fluid and other use pipe. Its representative material Q235 grade a steel.
GB/T3092-1993 (galvanized welded steel pipe for low pressure fluid delivery). Mainly used for conveying water, gas, air, oil and heating hot water or steam and other generally low pressure fluid and other use pipe. Its representative material is: Q235 grade a steel.
GB/T14291-1992 (mineral fluid transport welded steel pipe). Mainly used in mine air pressure, drainage, gas drainage shaft with a straight seam welded steel pipe. Its representative material B, Q235A grade steel. GB/T14980-1994 (large diameter welded steel pipe for low pressure fluid delivery). Mainly used for conveying water, sewage, gas, air, heating steam and other low pressure fluid and other purposes. Its representative material Q235 grade a steel.
GB/T12770-1991 (stainless steel welded pipe for mechanical structure). Mainly used in machinery, automobiles, bicycles, furniture, hotels and hotel decoration and other mechanical components and structural parts. Its representative material 0Cr13, 1Cr17, 00Cr19Ni11, 1Cr18Ni9, 0Cr18Ni11Nb, etc..
GB/T12771-1991 (fluid transport with stainless steel welded pipe). Mainly used for conveying low pressure corrosive medium. Representative material for 0Cr13, 0Cr19Ni9, 00Cr19Ni11, 00Cr17, 0Cr18Ni11Nb, 0017Cr17Ni14Mo2, etc..
Photo of our Longitudinal Pipe:
The straight tube is mainly used in tap water engineering, petrochemical industry, chemical industry, electric power industry, agriculture and city construction. For liquid conveying: water supply, drainage. Gas, steam and liquefied petroleum gas for gas transmission. Used as a pile driver, as a bridge; pier, road, building structure, etc..
welding
Straight seam pipe generally high-frequency welding, high frequency welding is a kind of induction welding (or pressure contact welding), it does not need to weld filler, weld spatter, welding heat affected zone is narrow, beautiful welding molding, welding, the advantages of good mechanical performance, so in the production of steel by wide application. According to the principle of electromagnetic induction and the exchange charge in the conductor tends to skin effect and proximity effect and eddy current heat effect, the edge weld steel local heating to a molten state, through the roller extrusion, the butt weld the intergranular bonding, so as to achieve the purpose of seam welding, cooling after the formation of a strong straight seam welding.
Weld gap
Will strip into the welded pipe unit, by the multi-channel roller rolling, strip gradually rolled up, forming the opening gap circular tube billet, adjusting the extrusion roller pressure, weld gap control in 1 ~ 3mm, and the weld ends flush. If the gap is too large, resulting in a reduction in the proximity effect, the eddy heat is insufficient, the welding seam between the poor bonding and produce no fusion or cracking. Such as the gap is caused by proximity effect increases, large welding heat, resulting in weld burning, or weld by extrusion, rolling form the pit affecting weld surface quality.
welding temperature
Low carbon steel material, welding temperature control in 1250~1460 C, can meet the pipe wall thickness 3~5mm welding penetration requirements. Welding temperature is mainly controlled by adjusting the high frequency eddy current heat power and welding speed. When insufficient heat input by heating the weld edge is not up to the welding temperature, metal structure remains solid, the formation of fusion or incomplete penetration; when the heat input is too large, heating the weld edge over welding temperature, burn off or droplet, molten hole can be formed in the weld.
standard
Straight pipe generally use the GB/T3091-2001 and GB/T9711.1-1997 standard.
Texture of material
Straight seam pipe commonly used material Q235A and Q235B and 16Mn, 20#, Q345, L245 and L290, X42, X46, X70, X80, 0Cr13, 1Cr17, 00Cr19Ni11, 1Cr18Ni9, 0Cr18Ni11Nb.
Quality testing
According to the standard of GB/T3091-2001 "welding steel pipe for low pressure fluid delivery", the surface quality of the steel pipe should be smooth, and there are no defects such as folding, cracking, delamination and lap welding. Steel tube surface allow a slightly less than wall thick negative deviation from scratch, scratch, joint dislocation, burns and scar defects. Allow the weld thickness and welding reinforcement.
Straight pipe should be made mechanical performance test and flattening test, flaring test, and to meet the requirements. Steel pipe should be able to withstand a certain internal pressure, if necessary, 2.5Mpa pressure test, to maintain a minute without leakage. Eddy current testing is allowed to replace hydrostatic test.
Eddy current testing according to GB/T7735-2004 "eddy current testing method of steel tubes" standard implementation. Eddy current testing method is the probe is fixed on the machine frame, inspection and weld maintain 3 ~ 5mm distance, rely on the rapid movement of the steel tube on the weld of comprehensive scanning, detection signal by eddy current flaw detector, automatic processing and automatic sorting, to inspection. After the inspection, the welded pipe is cut off by the specified length, and is off the assembly line. The pipe ends shall be chamfering, marking, finished tube hexagon binding package factory.
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