Hebei Haihao Group

  • The development prospect of wear-resistant elbow industry

    The development prospect of wear-resistant elbow industry

    With the increase of engineering construction, the demand for new pipes is also growing. As a new type of pipe, wear-resistant elbow not only obtains competitive advantage, but also obtains more guarantee with high quality. Therefore, the application field ...
  • The benefits of ductile iron pipe

    The benefits of ductile iron pipe

    Ductile iron pipe, made from ductile cast iron, is a graphite-rich cast iron in which the graphite has a spheroidal shaped molecular structure. This molecular structure makes the cast iron less brittle and more resistant to impact than the other varieties, ...
  • Duplex/ Super duplex butt weld fittings (ASTM A815)

    Duplex/ Super duplex butt weld fittings (ASTM A815)

    The ASTM A815 specification covers duplex and super duplex butt weld fittings to match ASTM A790 and ASTM A928 pipes. These special grades of stainless steel are used for various chemical processes,  piping, oilfield piping and heat exchangers, flue gas de ...
  • The functions and methods of steel pipe coating

    The functions and methods of steel pipe coating

    Steel pipe coating is an anti-corrosion coating treatment, preventing steel pipes form corrosion or damage in the process of storage and transportation. In the past,steel pipes are all brushed artificially one by one by black bituminous paint. This work no ...
  • Difference between malleable cast iron pipe fittings and galvanized pipe fittings

    Difference between malleable cast iron pipe fittings and galvanized pipe fittings

    Malleable cast iron pipe fittings are made of malleable steel. It should be noted that although Ma steel is malleable cast iron with toughness, it cannot be used for forging. Ma steel pipe fittings and malleable cast iron pipe fittings are named by pipe ma ...
  • What is the main classification of stainless steel pipe?

    What is the main classification of stainless steel pipe?

    Stainless steel pipe belongs to a kind of steel pipe, it is made of the material of stainless steel so called stainless steel pipe. Its main material is 304, 304L, 316, 316L.Because of its corrosion resistance, beautiful appearance and other advantages, th ...
  • Steel pipe fittings material and production

    Steel pipe fittings material and production

    When we talk about the material of steel pipe fittings,we talk the material steel grade,for example,ASTM A234 WPB or A403 WP316L. It is the material information of this fitting,not the raw material steel grade for fittings production.A butt welding steel e ...
  • Prospects of pipe fittings industry

    Prospects of pipe fittings industry

    Hebei Haihao Group specialized in flange and pipe fittings. Elbow, flange, tee, cross, reducer, etc. all belong to pipe fittings, which widely used in building industry. Elbow is used at pipe turnings; flange is used to connect pipe at the end of pipe. Tee ...
  • Identification of seamless steel pipe

    Identification of seamless steel pipe

    A seamless steel pipe,a kind of long steel, has hollow section without seam. It is made from perforated tubular billets which are made of ingot steel or solid steel pipe and undergoes the process of hot rolling, cold rolling or cold drawn. Due to its hollo ...
  • The difference between ERW, DOM, and seamless steel pipe

    The difference between ERW, DOM, and seamless steel pipe

    ERW pipe (resistance welded pipe) The name ERW is because such stainless steel pipes involve certain types of welding processes such as spot welding and seam welding. Seam welding is usually used when manufacturing round, square and rectangular stainless s ...
  • What is the difference between pipeline series A and series B?

    What is the difference between pipeline series A and series B?

    Series A and series B are sometimes referred to as British or metric tubes, mainly because of their different outer diameters. The difference between series A and series B refers to the impact temperature in their properties. The impact temperature and the ...
  • Advantages and disadvantages of precision steel tube rolling at recrystallization temperature

    Advantages and disadvantages of precision steel tube rolling at recrystallization temperature

    Precision steel tube: hot rolling is relative to cold rolling, which is rolled below the recrystallization temperature, and hot rolling is rolled above the recrystallization temperature. Advantages of precision steel tube rolling at recrystallization tempe ...
  • Differences between carbon steel and stainless steel

    Differences between carbon steel and stainless steel

    Selecting the right type of steel for your project is one of the most important decisions. Before deciding individual material grades, it is also first necessary to decide which type of steel to use, such as carbon steel or stainless steel. This article wi ...
  • Pickling and passivation of 304 stainless steel tubes

    Pickling and passivation of 304 stainless steel tubes

    Stainless steel tube because of its good mechanical properties, high hardness and high wear resistance and other advantages are widely used in military products parts processing. The surface treatment of this material is carried out after the solid solutio ...
  • Reasons for the use of stainless steel tubes for heat transfer tubes

    Reasons for the use of stainless steel tubes for heat transfer tubes

    Thinning the thickness of the stainless steel tube can effectively improve the overall thermal conductivity of the stainless steel tube. When choosing a stainless steel tube with a wall thickness of 0.5-0.7mm, from the experimental results, the thermal con ...
  • Difference between martensitic stainless steel and austenitic stainless steel

    Difference between martensitic stainless steel and austenitic stainless steel

    Austenitic stainless steel: Containing more than 18% chromium, about 8% nickel and a small amount of molybdenum, titanium, nitrogen and other elements. It has good comprehensive performance and can resist corrosion of various media. Austenite crystal struc ...
  • Difference between galvanized and stainless steel

    Difference between galvanized and stainless steel

    Galvanized steel and stainless steel are the most common methods of preventing pipe corrosion.There are the difference between them. (1)Different concepts Galvanizing refers to coating a layer of metal zinc on the surface of steel plate to prevent corrosio ...
  • Corrosion characteristics of metals such as metal

    Corrosion characteristics of metals such as metal

    When most metals come into contact with certain substances in air or water, chemical changes occur that reduce the integrity of the metal. This process is called corrosion. Among them, materials such as oxygen, sulfur, and salt can cause metal corrosion, a ...
  • What problems will be encountered when welding 316L stainless steel plate?

    What problems will be encountered when welding 316L stainless steel plate?

    316L stainless steel plate belongs to austenitic stainless steel, this kind of steel has excellent plasticity, patience, corrosion resistance. Due to the addition of Mo element (2% ~ 3%), 316L stainless steel plate not only has excellent pitting resistance ...
  • Selection of stainless steel materials in desalination plant

    Selection of stainless steel materials in desalination plant

    Desalination plants are known to be very corrosive because of the high temperatures in the environment. Austenitic stainless steels of the previous 300 series are often the preferred materials for desalination plants. In cases where higher corrosion resist ...