LSAW Steel Pipe

    High pressure boiler seamless steel tube is a kind of boiler tube, which belongs to the seamless steel tube category. The manufacturing method is the same as the seamless pipe, but there are strict requirements on the steel type used for manufacturing the steel pipe.     High-pressure boiler seamless steel tubes are often under high temperature and pressure when used. The tubes will be oxidized and corroded under the action of high temperature flue gas and water vapor. It is required that the steel pipe has high durability, high resistance to oxidation and corrosion, and good structural stability. High-pressure boiler seamless tubes are mainly used to manufacture superheater tubes, reheater tubes, air ducts, and main steam tubes for high-pressure and ultra-high-pressure boilers.     Low and medium pressure boiler tubes GB3087-2008, seamless steel tubes for high pressure boilers GB5310-1995 are used to manufacture low temperature and high pressure bo...

    Hydrostatic pressure test is an indispensable link in the manufacturing process of steel pipes, and its role is to detect the anti-leak function of steel pipes under the standard test pressure and time constant. It is the same as the flaw detection process such as radiography and ultrasonic, which is an important means to check the overall quality of steel pipes. What are the requirements for hydrostatic test of petroleum casing pipe?     1. The hydrostatic test pressure value of the pipe with coupling and threaded pipe is the lowest value of the hydrostatic test pressure of the flat-end pipe, the maximum hydrostatic test pressure of the coupling, and the internal pressure leakage resistance, but the standard maximum pressure is 69MPa and the calculated pressure The value is usually rounded to the nearest 0.5 MPa.     2. According to API requirements, the hydrostatic test pressure measuring device should be calibrated within 4 months before each use...

    Metal elements and functions required in the production of stainless steel:     Nickel: Nickel is a very important core element in stainless steel. It can improve the strength and toughness of steel and improve hardenability. When the content is high, some physical properties of steel and alloy can be significantly changed, and the corrosion resistance of steel is improved.     Manganese: It can improve the strength of steel, reduce and eliminate the adverse effects of sulfur on it, and improve the hardenability of steel. High alloy steel (high manganese steel) with high manganese content has excellent wear resistance and Other physical properties.     Chromium: It can improve the hardenability and wear resistance of steel, and can improve the corrosion resistance and oxidation resistance of steel.     Vanadium: It can refine the grain structure of steel and increase the strength, toughness and wear resistance of steel. When ...

    Causes of whitening on the surface of galvanized steel strip     If a layer of condensed water is adhered to the surface of the galvanized layer, it reacts with oxygen, carbon dioxide, hydrocarbons, sulfur dioxide, soot, dust and other chemical gases to become a corrosive aqueous solution and adheres to the surface of the galvanized layer. To form an electrolyte. This electrolyte undergoes electrochemical corrosion with a zinc layer with poor chemical stability, resulting in a powdery corrosion product.     The main reasons for the white rust zinc layer to corrode indoors are: 1. high indoor air humidity; 2. the finished product is not dried and the warehouse; 3. the surface of the zinc layer is condensed with a water film, when the moisture content in the air reaches 60% or In the range of 85 ~ 95%, and PH <6, the corrosion reaction is more severe.     When the water temperature is up to about 70 ℃, the fastest way to corrode the zin...

    After the production of the casing pipe and the pipeline, the surface is generally sprayed with anti-rust paint, and the outer surface of the pipe is sprayed with a prominent logo according to the API standard requirements, indicating the manufacturer of the product, the ISO certificate number of the manufacturer, API logo, API Certificate number, nominal diameter, nominal weight, steel grade, length, forming method, hydraulic pressure, furnace number, batch number, tube number and identification of special requirements of customers, such as shipping marks. The thread of the oil casing shall be protected by special thread anti-rust grease.     Each pipe must be capped with steel and plastic at both ends to protect the wire buckle or chamfer.     For petroleum special pipes are usually packed in steel bands, and the weight of each bundle is preferably not more than 2.5 tons, which is convenient for loading and unloading. A waterproof label is usually...