Hebei Haihao Group

  • What is A182 F51?

    What is A182 F51?

    A182 F51 is a duplex stainless steel made of 21% chromium,2.5% molybdenum and 4.5% nickel-nitrogen alloy. It has high strength, good impact toughness and good integral and local stress corrosion resistance. The yield strength of duplex stainless steel is t ...
  • A batch of flanges are ready to be shipped to Canada

    A batch of flanges are ready to be shipped to Canada

    After more than one month of production, the flange production of Canadian customers was completed.After inspection, the size meets the requirements, and they are ready to be sent to Canada. One day about two months ago, a Canadian customer sent me an inqu ...
  • Hot dip galvanized pipe fittings - Indonesia order

    Hot dip galvanized pipe fittings – Indonesia order

    The hot dip galvanized pipe fittings for this batch of order include galvanized elbow, galvanized reducer, galvanized tee, galvanized pipe cap, etc. At the request of the customer in Indonesia, the pipe fittings were hot dip galvanized. The main purpose of ...
  • ASTM A694 F65 customized forgings are finished

    ASTM A694 F65 customized forgings are finished

    Recently we finished the order of customized forging products.It includes pipe and reducers with material ASTM A694 F65. ASTM A694 F65 FORGED PIPE ASTM A694 F65 FORGED PIPE Forging is a processing method that uses forging machinery to hammer or press the m ...
  • The difference between ANSI B36.19 and ANSI B36.10

    The difference between ANSI B36.19 and ANSI B36.10

    ANSI B36.19 contain stainless steel seamless steel pipes and welded steel pipes,ANSI B36.10 contain seamless steel pipes and welded steel pipes. The steel pipe data chart below can be used to find pipe sizes, diameters, wall thickness, working pressures an ...
  • What's forging process and precautions?

    What’s forging process and precautions?

    Technological process: (1) Use grinding wheel cutting machine to cut the material, turn the end face and fillet R5. (2) The furnace temperature is (450 ± 10) ℃ and the holding time is 136min. (3) Die forging and die forging equipment is 6300kN friction pre ...
  • What problems may arise when forging is quenched and cooled?

    What problems may arise when forging is quenched and cooled?

    Let’s learn about the quality problems and solutions of forgings in quenching and cooling: Insufficient hardness and enough hardening depth: quenching cooling rate is low is forging quenching hardness is insufficient, the cause of the uneven hardness ...
  • What are the methods of heat treatment for forgings?

    What are the methods of heat treatment for forgings?

    According to different types of steel and process requirements, the following heat treatment methods are often used for forgings: annealing, normalizing, tempering, quenching and low temperature tempering, quenching and aging, etc.Let’s take a look a ...
  • The inspector from the Singapore customer came to inspect the piping products

    The inspector from the Singapore customer came to inspect the piping products

    About a month ago, I received an inquiry from a customer in Singapore, the main product is carbon steel flanges and pipe fittings. The products in the inquiry are as follows: Dimensions inspection of blind flange (1)WN flange RF, size: 1.1/2 “~18R ...
  • A bitch of carbon steel fittings ready for shipment to Turkey

    A bitch of carbon steel fittings ready for shipment to Turkey

    Today, the production of a batch of carbon steel pipe fittings has been completed. The quality test is qualified and they are all in line with the requirements. They have been smoothly shipped to Turkey. Elbow LR Seamless About two months ago, a customer f ...
  • Precautions for stamping elbow processing

    Precautions for stamping elbow processing

    Stamping elbow is a good elbow, which has been widely used and promoted in different fields and industries. The stamping elbow is formed by the same die as the pipe, and then the two half ring elbows are welded in batches. Due to the different welding stan ...
  • Professional inspection of elbow and tee in  small size

    Professional inspection of elbow and tee in small size

    My Korean client Mr. Park inspected the order at our factory from May 25 to 31. During this period, I accompanied Mr. Park to carry out the inspection. We prepared a lot of inspection tools, some of which we bought new, and no customer or third party had a ...
  • Pakistan customer ordered forgings

    Pakistan customer ordered forgings

    Forging is a workpiece or blank obtained by forging and deforming a metal blank. The mechanical properties of metal billet can be changed by applying pressure to make it produce plastic deformation. The looseness of metal can be eliminated by forging. Hole ...
  • Pipe fitting and flange used in Power Plant Restoration Project in Serbia

    Pipe fitting and flange used in Power Plant Restoration Project in Serbia

    As a developing country, Serbia has witnessed rapid economic growth in recent years, which has been called “the tiger of the Balkans” by some people. All aspects need to be built of this country. WELD NECK FLANGES EN 1092-1 P235GH Electricity i ...
  • Manufacturing technology and application of tee

    Manufacturing technology and application of tee

    Tee is a pipe fitting and pipe connector, which is used in the branch pipe of main pipeline. There are two kinds of tee: equal tee and reducing tee. Named because the three ends can be connected to the pipe. Recently our factory produce some thick wall tee ...
  • The introduction of chemical polishing

    The introduction of chemical polishing

    The chemical polishing is a common polishing method for stainless steel products. Chemical polishing generally uses nitric acid or phosphoric acid and other oxidizing agent solution, under certain conditions, make the surface of stainless steel products ox ...
  • 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 ...