環球新聞資訊日前獲悉，黃夾克保溫鋼管在中、小口徑的熱輸原油或供暖管道上，為了削減管道向土壤散熱，在管道外部加上保溫復合層。常用的保溫材料是硬質聚氨脂泡沫塑料，適用溫度為-185～120℃。黃夾克保溫鋼管高質量這種材料質地松軟，為進步其強度，在隔熱層外面加敷一層高密度聚乙烯層，構成復合材料構造，以避免地下水進入保溫層內。運用高壓成套聚氨酯發泡設備對鋼管外外表進行拋丸除銹處理和外護管內外表電暈處理技術，進步保溫管的粘接功能。保溫層材料為密度60kg/m3至80kg/m3的硬質聚氨酯泡沫，充沛添滿鋼管與套管之間的空隙，并具有必定的粘接強度，使鋼管、外套管及保溫層三者之間構成一個結實的整體。聚氨酯泡沫具有杰出的機械功能和絕熱功能，通常情況下可耐溫120℃,經過改性或與其它隔熱材料組合可耐溫180℃。

Global News recently learned that yellow jacket insulated steel pipes in small and medium-sized heat transfer crude oil or heating pipelines, in order to reduce the heat pipe to the soil heat dissipation, in the pipeline external insulation layer. The commonly used thermal insulation material is rigid polyurethane foam, and the temperature is -185 ~ 120 degrees. Yellow jacket insulating steel pipe of high quality this kind of material is soft in texture, in order to improve its strength, a layer of high density polyethylene is added outside the insulating layer to form a composite structure, to avoid groundwater into the insulating layer. The high-pressure polyurethane foaming equipment was used to blasting and rust removal of the outer surface of the steel pipe and corona treatment of the outer surface of the outer protective pipe to improve the bonding function of the heat preservation pipe. The insulating layer material is rigid polyurethane foam with density 60kg/m3 to 80kg/m3, which fully filled the gap between the steel pipe and the casing, and has a certain bonding strength, so that the steel pipe, the outer sleeve pipe and the insulation layer can form a solid whole between the three. Polyurethane foam has excellent mechanical function and adiabatic function. Under normal circumstances, it can withstand temperatures of 120 degrees Celsius. After modification or combination with other thermal insulation materials, polyurethane foam can withstand temperatures of 180 degrees Celsius.

黃夾克保溫鋼管大連聚氨酯保溫管使用效果鋼管腐蝕問題普遍存在于國民經濟和國防建設的各個部門，既給國民經濟帶來了巨大的損失．也給生產和生活造成極大的困難。鋼管在自然條件下(大氣，天然水體、土壤)或人為條件(酸、堿、鹽及其它介質)下，每時每刻都黃夾克保溫鋼管高質量在發生腐蝕．一種自發進行的無謂的消耗。其根本原因鋼質管道是因為處于熱力學不穩定狀態，在上述條件下它們就要恢復原來的相對穩定的狀態．生成鐵氧化物碳酸鹽等．或轉變為可溶性離子。這一過程就是金屬的腐蝕過程。根據統計，我國鋼鐵年產量1．6億噸．每年因腐蝕而損耗6千多萬噸．差不多等于上海寶鋼鋼鐵總廠的年產量。腐蝕不僅是鋼鐵資源的浪費，還會因腐蝕使管道、設備使用壽命縮短更換新管道設備的造價費用遠遠超過金屬材料本身的價格，生產成本因此而增大，降低了經濟效益腐蝕造成的直接和間接經濟損失是巨大的。腐蝕產物形成垢層，影響傳熱和介質流速傳熱效率降低，能耗由此大大增加，我國每年因腐蝕造成的經濟損失高達2800億元，比每年風災，水災、地震火災等自然災害的總和還要多。

The corrosion problem of yellow jacket insulating steel pipe Dalian polyurethane insulating pipe exists widely in various departments of national economy and national defense construction, which not only brings huge losses to national economy, but also brings great difficulties to production and life. Under natural conditions (atmosphere, natural water, soil) or man-made conditions (acid, alkali, salt and other media), the yellow jacket insulated steel pipe is corroded with high quality at all times. A spontaneous and meaningless consumption. The fundamental reason is that the steel pipes are in a thermodynamic unstable state. Under the above conditions, they will restore the original relatively stable state, form iron oxide carbonate, etc. or change into soluble ions. This process is the corrosion process of metals. According to statistics, the annual output of iron and steel in China is 160 million tons, and the annual loss due to corrosion is more than 60 million tons, which is almost equal to the annual output of Shanghai Baosteel General Works. Corrosion is not only a waste of iron and steel resources, but also because of corrosion, the cost of replacing new pipeline equipment is much higher than the price of metal materials. Therefore, the production cost increases, and the direct and indirect economic losses caused by economic corrosion are enormous. Corrosion products form scales, which affect the efficiency of heat transfer and medium velocity heat transfer, thus greatly increasing energy consumption. The annual economic losses caused by corrosion in China are as high as 280 billion yuan, which is more than the total of natural disasters such as wind, flood, earthquake and fire.

盤前預測：上海建材弱勢企穩
回顧昨日，本地市場建筑鋼材價格大幅下跌。具體到各資源價格，16-25mm規格HRB400材質螺紋鋼主流價格4500-4540元/噸，同品規國標資源主流價格在4320-4380元/噸;HPB300高線4500-4760元/噸;8-10mm規格盤螺主流報價一般在4590-4760元/噸。
  回顧昨日，本地市場建筑鋼材價格大幅下跌，全天成交有所好轉。具體來看，早盤商家報價小幅下調，終端采購情緒低迷，開盤后期螺走勢不佳，詢單幾無，近兩日的出貨不暢使得商家報價大幅下調，低位成交有所放量，午后低位資源回歸主流價格，市場成交放緩，其中華東大廠廠提資源多成交至4500-4520元/噸之間，小廠資源多成交至4320-4340元/噸之間。
  綜合來看，昨日成交雖有放量，但商家心態未見明顯好轉，預計今日本地市場或弱勢企穩。
Pre prediction: weak building materials in Shanghai
Yesterday, the price of construction steel dropped sharply in the local market. Specifically to the price of each resource, 16-25mm HRB400 material thread steel mainstream price 4500-4540 yuan / ton, with the same product standard mainstream resource price in 4320-4380 yuan / ton; HPB300 high-speed line 4500-4760 yuan / ton; 8-10mm disc screw mainstream price generally in 4590-4760 yuan / ton.
Yesterday, the price of construction steel in the local market dropped sharply, and the turnover was improved all day. Specifically, the early quotation of merchants slightly lower, terminal purchasing mood is depressed, late opening snail trend is not good, inquiries are few, the last two days of shipment is not smooth so that the merchants quoted a substantial reduction in low trading volume, low afternoon resources back to the mainstream price, market transactions slowed down, in which East China big factory more resources Turnover to 4500-4520 yuan / ton, small factory resources to more than 4320-4340 yuan / ton between.
Taken together, yesterday's trading volume, but business mentality has not improved significantly, is expected to stabilize today's local market or weak.