Hebei Haihao Group

  • Cancel the export tax rebate of some steel products,is it good or bad?

    Cancel the export tax rebate of some steel products,is it good or bad?

    Tariffs on some steel products will be adjusted from May 1, 2021, according to a notice posted on the website of the Ministry of Finance.Among them, pig iron, crude steel, recycled steel raw materials, ferrochrome and other products to implement zero impor ...
  • The introduction of stamping elbow and its advantages

    The introduction of stamping elbow and its advantages

    The stamping elbow is a kind of elbow pipe fittings. It has shown good performance in practical use at home and abroad. The basic forming process of stamping elbow is: the sheet metal with the same material as the pipe is pressed into a half annular elbow ...
  • Forming process of hot push elbow and cold extrusion elbow

    Forming process of hot push elbow and cold extrusion elbow

    Elbow is used for pipe bending, which accounts for a large part of all pipe fittings in the pipeline system, accounting for about 80%. At present, hot push, stamping and extrusion are commonly used forming process of seamless elbow. Hot push elbow forming ...
  • What should we pay attention to when welding stainless steel pipe?

    What should we pay attention to when welding stainless steel pipe?

    The welding of stainless steel pipes directly affects the quality and service life of stainless steel pipes.What should we pay attention to when welding stainless steel pipe? Here are the main matters need attention. 1.The use of vertical external characte ...
  • What are the main factors affecting the brightness of stainless steel tube after annealing?

    What are the main factors affecting the brightness of stainless steel tube after annealing?

    The quality of stainless steel tube is determined by the brightness of stainless steel tube after annealing. There are many influencing factors, and the following are the several main factors: 1.Whether the annealing temperature reaches the specified tempe ...
  • Advantages and disadvantages of chemical analysis method for positive materials

    Advantages and disadvantages of chemical analysis method for positive materials

    In pipeline industry,direct reading spectrometer is widely used to identify the materials.But except for the PMI,chemical analysis method is also often used.Then what is the advantages and disadvantages of chemical analysis method? Advantages of chemical a ...
  • ASTM A420 WPL6 Fittings

    ASTM A420 WPL6 Fittings

    ASTM A420/A420M-2016 “Fittings for Forged Carbon Steel and Alloy Steel Pipe for Low Temperature”, American Standard Low Temperature Seamless or Welded Pipe Fittings, the domestic corresponding material is A333 Gr.6, generally used in low temper ...
  • Four basic methods of heat treatment

    Four basic methods of heat treatment

    Heat treatment is a very important process in the production of pipe fittings. They can remove the stress of the pipe fittings or improve their hardness. For the pipe fittings, there are many kinds of material and they can be used all kinds of enviroment. ...
  • The introduction to Teflon coating and its characteristics

    The introduction to Teflon coating and its characteristics

    Teflon coating is a non-stick industrial coating with wear resistance, heat resistance, corrosion resistance and many other characteristics. At present, it is widely used as a coating for pipeline products. Teflon industrial coatings are available in powde ...
  • FBE epoxy coating pipe

    FBE epoxy coating pipe

    Hebei Haihao Group is a manufacturer specialized in producing flange, pipe fittings and steel pipe. When customer purchase steel pipe for pipeline systems, always we see the pipe has been asked for a epoxy coating FBE. Hebei Haihao Group can provide custom ...
  • 3PE Epoxy coating pipe

    3PE Epoxy coating pipe

    Recently, our company received an order for steel pipes from Saudi Arabia, and the customer required the steel pipes to be coated with 3PE, Hebei Haihao Group is a professional production of steel pipe factory, to meet the different needs of customers. Tod ...
  • The Singapore customer is very satisfied after receiving the pipeline goods

    The Singapore customer is very satisfied after receiving the pipeline goods

    A few months ago, I received an inquiry from a customer in Singapore. The Main products in this inquiry include: (1) 90° Elbow LR Seamless 1.1/2″ to 8″ SCH40 and SCH80 ASME B16.9 (2) Concentric Reducer Seamless 2″*1.1/2″ to 8″ ...
  • The advantages and disadvantages of socket welded fittings

    The advantages and disadvantages of socket welded fittings

    Socket welded fitting is another kind of welded fitting compared with butt-welded fitting. The diameter of socket welded fitting is usually the small diameter-2 inches and below. The socket welded fittings are welded by fillet weld, which is more suitable ...
  • Difference between head and cap

    Difference between head and cap

    The pipe cap is a kind of pipe fitting installed on the external thread of the pipe end to block the pipe. The head is suitable for the upper and lower parts or left and right ends of the vessel equipment. Generally, the pipe cap is of outer diameter, such ...
  • The function of sandblasting

    The function of sandblasting

    There are many manufacturing processes of producing pipe fittings, like cutting end bevels, heat treatment and sandblasting etc. Every process plays a very important role.The following is a brief production about the function of sandblasting: 1.The cleanin ...
  • What's the small-diameter welded pipe?

    What’s the small-diameter welded pipe?

    Small diameter welded pipe, also known as small diameter welded steel pipe, is a steel pipe welded by steel plate or strip steel after crimping. The production process of small-diameter welded pipe is simple, the production efficiency is high, the varietie ...
  • What's the hot dip galvanizing process of flange?

    What’s the hot dip galvanizing process of flange?

    The process of hot galvanizing of flange is acid pickling assisted plating drying hot dip galvanizing separation cooling passivation. Customers who purchase flange will be galvanized according to the requirements of the use of the flange. Hot dip galvanizi ...
  • What are the differences between forged flange and cast flange?

    What are the differences between forged flange and cast flange?

    The cast flange has the advantages of accurate blank shape and size, small processing capacity and low cost, but it has casting defects (porosity, cracks and inclusions); the streamline of internal structure of casting is poor (even worse if it is a cuttin ...
  • Production process of seamless steel pipe and welded pipe

    Production process of seamless steel pipe and welded pipe

    Stainless steel pipes are usually divided into two categories: seamless pipes and seam welded pipes. In the production process, the required equipment is also different. The difference can be seen from the production process flow chart of the two: In the p ...
  • What's the anti-corrosive steel pipe lined with cement mortar?

    What’s the anti-corrosive steel pipe lined with cement mortar?

    Anti-corrosive steel pipe lined with cement mortar refers to the anti-corrosive and wear-resistant treatment of cement mortar inside the pipe body. As the steel pipe lined with cement mortar is filled with concrete, it can absorb a lot of heat energy. Ther ...