At present， the fundamentals faced by the domestic copper bar market are still mixed. On the one hand， the market supply is expected to shrink， but on the other hand， and the markets expectation of future demand is pessimistic. In the short term， domestic steel prices will enter the operating track of range consolidation. To sum up， considering the current situation of demand and inventory in the steel market， it is difficult for the steel market to make a breakthrough. As the th National Congress of the Communist of China is approaching environmental protection phenomena such as steel mills are still going on， and black series speculation is still taking place. But personally the fluuation range of the market in this region is limited， and businesses can operate flexibly on a short-term basis， and the shipment transaction is * * *.
동관은 수도관， 난방관， 냉동관을 설치하는 것이 가장 좋은 특징을 가지고 있다.
군사.In buildings with continuous heating water supply， a lot of corrosion and pitting occur on heating water pipes.
동관은 수도관， 난방관， 냉동관을 설치하는 것이 가장 좋은 특징을 가지고 있다.
파 탈 라동관 지온의 장점과 적용 범위는 현재 지온은 편안한 난방 방식일 뿐만 아니라 현대 생활의 질의 상징이기도 하다.갈수록 많은 주택， 공공건축 체육시설， 공업시설 등 장소에서 지온라디에이터를 사용하기 시작하는데 이는 지온의 중요한 구성부분이다.구리의 내식성 때문에 많은 곳에서 구리 파이프를 라디에이터의 주요 재료로 선택한다.
일반적으로 산소아세틸렌을 기원으로 사용하고 액화석유가스 용접도구를 사용하여 가열한다.용접 도구의 용접봉은 이음매를 향하고 계속해서 전체 이음매를 가열해야 한다.이것은 과도한 국부 가열을 피할 것이다.
The material of the water separator is the same， the expansion coefficient is the same， the cost of the floor heating system is higher.
Four of the five major application fields of copper plate， copper bar and copper pipe: copper is used as various pipes， pipe fittings and decorative devices in the construction industry.
Dissolved oxygen in water is a major factor in copper pipe corrosion.
The blowpipe shall be perpendicular to the lead pipe during welding， and the flame shall be moved continuously to prevent local overheating and the flux from carbonizing before filler metal is added.
대리상Disadvantages: Due to loose tissue and high pressure resistance， the pipe is only used to produce small air conditioning copper rods.
The main force of iron ore futures closed at in The closing price of the day today was the same as that of the previous trading day including * * * * ， * * * ， settlement price ， trading volume ， and position volume . The intraday tradg volume decreased by compared with the previous trading day， and the position volume decreased by compared with the previous trading day. After six consecutive days of downward adjustment， there was a rebound at the bottom of the session today， but it was corrected again later， and the closing was flat.
If you want to avoid this kind of situation for a long time， you can choose passivation treatment. In this way， not only is the copper surface serious， it can be cleaned under normal circumstances but it is not a big problem to keep it in the air for one year or more after ultrasonic treatment and immersion treatment， so this effect is very good.
우선， 우리는 창고를 하나 세워야 한다.창고 내의 온도는 보통 - & deg로 유지해야 한다.C. 습도는 정상이어야 합니다.방은 통풍을 유지해야 한다.
탁월 한 서비스안정성: 구리 파이프는 금속 파이프와 비금속 파이프의 장점을 결합합니다.그것은 플라스틱 파이프보다 더 단단하고， 일반 금속의 고강도를 가지고 있다 (동관을 냉발시키는 강도는 같은 경도를 가진 강관과 같다ess）；그것은 일반 금속보다 쉽게 구부러지고 강인성과 높은 확장성을 가지고 있으며 진동， 충격 및 동팽창에 강한 재산을 가지고 있습니다.
Four in one formula and process conditions Preparation of solution Take formula as an example: mix the calculated amount of water for zinc oxide into a paste slowly add it into the calculated amount of phosphoric acid under stirring until it is completely dissolved， then add zinc nitrate and tartaric acid， add sodium alkosulfonate and OP emulsion， and stir to make it completely dissolved. Then add chromium dihydrogen phosphate dissolved in dilute phosphoric acid， and add titanium sulfate. After all materials are added， dilute them to the total volume， stir them to make the solution even， cool them to room temperature， put a large amount of iron filings in the solution， and soak them for - days to make them contain enough ferrous ions. When the content of ferrous ion reaches above g/L， adjust the free acidity and total acidity of the solution to the specified value， and then the solution can be used at elevated temperature. When the ferrous ion reaches the above value， the phosphating speed is fast， the solution is stable， and the phosphating film is fine and dense. During operation， attention shall be paid to controlling the temperature. If the temperature is higher than ℃， the degreasing technology of degreased copper pipe. How to make degreased copper pipe? The process flow of degreased copper tube? What are the characteristics of degreased copper tubes? Use of degreased copper tube? There are too many questions. Lets solve them at once. Everyone knows the copper tube. Nitrate reacts easily. The heater should be installed on the two walls of the tank， not on the bottom of the tank， to prevent local overheating. Stainless steel pipe or iron pipe should be used for heater， and lead pipe or copper pipe should not be used to avoid contamination of solution by impurities. What is degreased copper pipipe? "The advantages of degreased copper pipes comprehensive treatment of grease， phosphating and passivation are described. This comprehensive treatment process can simplify the process， reduce the work area， save equipment costs， shorten working hours， improve labor productivity and reduce costs. This method can only be used in the occasions where the requirements for coating quality are not high.However， in actual production，군사.45# 원강， due to the amount of oil contamination， light and heavy rust， the consumption rate of each component in the solution is different，군사.310s 스테인리스 파이프， so attention should be paid to adjustment and control to maintain its due role. What is the degreasing copper tube? "I have roughly known the degreasing methods of degreasing copper tubes: solvent degreasing， ultrasonic degreasing， high pressure hot water degreasing， electrolytic degreasing， etc. Solvent degreasing: use degreasing solvent to dissolve the oil on the surface of red copper pipe， collect it together into a container， volatilize， and separate the pollutants from the circulation system. This method was used in the early stage， which has problems such as low cleaning efficiency， difficult maintenance， and environmental pollution. In recent years， many kinds of surfactants have been developed. The lipophilic group of surfactants can help to dissolve oil in water to realize degreasing. Alkali degreasing: Alkali degreasing is a complex chemical physical process. In addition to saponification reaction there are sometimes emulsion reaction and adsorption reaction. Typical saponification reaction formula is as follows: RCOOH+NaOHRCOONa+HO At present， industrial degreasers are composite reagents， and the solution temperature is ℃. Ultrasonic degreasing: ultrasonic degreasing is to degrease the upper and lower surfaces of red copper pipes by using ultrasonic to generate high-speed vibration， whichtly used for monomer and irregular shaped components. High pressure hot water degreasing: without degreasing agent， heat the deionized water to ℃， and spray it directly to the surface of red copper pipe for cleaning under the pressure of about bar. Electrolytic degreasing: electrolytic degreasing， using the red copper tube as the cathode to generate H， which will scour the oil stain on the surface of the red copper tube; The O generated by the anode is in atomic state and has strong oxidation capacity， which can improve the degreasing effect. Therefore， the problem that alkali spraying and brushing cannot fully contact the micro concave part of the surface is solved. Generally， the cleaning effect of alkali degreaser spraying or high-pressure hot water degreasing plus brushing can meet the requirements of most users. If there are special requirements， multiple methods can be used together. According to practical experience， the degreasing effect of various degreasing methods (one side of the copper tube) is as follows: alkali degreaser spray plus brushing: mg/m alkali degreaser brushing plus electrolytic degreasing: mg/m ultrasonic wave: mg/m high-pressure hot water degreasing: 군사.Red copper inventory may end the trend of continuous decline. With the increase of production restriction of steel enterprises and the pressure of demand， the continuous decline of iron ore port inventory may end. In addition， according to the new statistics of * *，군사.7075 알루미늄 막대， the available days of imported iron ore of steel mills are days， and is on the high side of history. The steel mill said that at present， the iron ore inventory basically meets the production requirements. Considering the future production reduction and restriction， the steel mill is not willing to replenish the inventory. [] Welding process of copper pipe Clean the end and seven ports of steel pipe with steel wool. Do not use abrasive cloth or abrasive paper to clean， because it will affect the clean interface and result in poor welding effect. On the other hand， in the steel plant， the lock price of the steel plant has been falling all the time， and the order receiving is poor. The capacity utilization rate of the steel plant is low， but the market is still in oversupply. The stock of the steel plant and the spot stock are both risirising， so the market price has fallen sharply. Subsequently， the futures market rebounded in a wave， and the spot price also increased with the increase. There was an instant of large volume of transactions. However， with the decline of black futures， the market transaction volume shrank significantly. In addition， the inventory pressure was high， traders shipped at low prices， and the spot price fell under pressure. Due to the strong drop resistance of medium and thick plates， the drop amplitude and rate are less than those of threads.