Hebei Haihao High Pressure Flange & Pipe Fitting Group Co.

  • Choose the right tee, not the expensive ones

    Choose the right tee, not the expensive ones

    Hebei Haihao Group is one of the largest manufacturers of flanges and pipe fittings in China. Take the stainless steel tee of ASTM A403 ASME B16.5 for example, in the production process, we strictly control the whole process. Quality inspection of tees The ...
  • Strict product inspection prevents you from receiving unqualified products

    Strict product inspection prevents you from receiving unqualified products

    Hebei Haihao Group, founded in 1982, is a professional manufacturer of flanges and pipe fittings. We not only have strong technical force, can produce various specifications and various series of pipeline components for customers, but also have a variety o ...
  • Long weld neck flange

    Long weld neck flange

    This week I received an inquiry from a Swiss customer, who needs DIN28115 PN25 Long weld neck flange. There are two kinds of materials, carbon steel and stainless steel. After I gave the quotation to the customer, the customer wanted several samples for ex ...
  • Difference between direct reading spectrometer and chemical analysis method for PMI

    Difference between direct reading spectrometer and chemical analysis method for PMI

    In pipeline industry,both Direct Reading spectrometer and Chemical Analysis Method are used to identify the materials.Let’s see the comparison between Direct Reading spectrometer and Chemical Analysis Method for PMI. Sampling Direct Reading Spectro ...
  • What's the PMI testing method?

    What’s the PMI testing method?

    We all known what is PMI and the application industries of PMI.But how about the PMI testing methods? There are three PMI testing methods.They are XRF Method,OES Method and LIBS Method. XRF Method XRF,namely X-ray Fluorescence Method is a PMI testing metho ...
  • The advantages and disadvantages of PMI (Positive Material Identification)

    The advantages and disadvantages of PMI (Positive Material Identification)

    In our piping industry,PMI is popularly used to inspect the material whether conformed with the demand.The reason why PMI widely used is it has below advantages: Flexible sampling methods of PMI can save the loss caused by sampling for the detection and a ...
  • What is the application industry for the PMI ?

    What is the application industry for the PMI ?

    In last article,we learned about what is PMI(Positive Material Identification)mean.What is the application industry for the PMI and why? PMI FOR ASTM A234 WP11 CL1 ELBOWS Actually we could find many industries in which the PMI is used. They include: Oil ...
  • What is PMI mean?

    What is PMI mean?

    In the pipeline industry,PMI is often mentioned.What is PMI? PMI is abbreviation for positive material identification.It is one of the non-destructive analysis of a metallic alloy to ensure product or alloy quality as per requirement. PMI testing is very q ...
  • A batch of API 5L seamless steel pipes was shipped to Canada

    A batch of API 5L seamless steel pipes was shipped to Canada

    Today, a batch of seamless steel tubes has been produced and ready to be shipped to Canada. About a month ago, a customer from Canada sent us an inquiry, mainly about seamless steel pipes. The products in the inquiry are as follows: Pipe, seamless, size: 2 ...
  • We provide ABS 3.2 certification to our Korean customers

    We provide ABS 3.2 certification to our Korean customers

    Hebei Haihao Group specialized in producing flange, pipe fittings and pipe. We have lots of customers from all over the world. Some clients couldn’t come to inspect the goods for their orders. So they will arrange third party inspection to ensure the ...
  • What problems may arise when forging is quenched and cooled?

    What problems may arise when forging is quenched and cooled?

    Next, 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 ha ...
  • Pipes with cement lining were shipped to England

    Pipes with cement lining were shipped to England

    Recently, the production of cement lined steel pipes has been completed, and passed the inspection. They have been ready to ship to the England. The pipe with cement lining About a month ago, I received an inquiry from a British customer. The products in t ...
  • Inventory list of EN10253-2 P265GH pipe fittings

    Inventory list of EN10253-2 P265GH pipe fittings

    P265GH is a low alloy high temperature structural steel, in accordance with the European standard EN10253-2. It is a kind of European standard boiler vessel plate. In P265GH steel grade, G stands for others, H stands for high temperature, P stands for stee ...
  • Pakistan forgings order

    Pakistan forgings order

    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 ...
  • What is the PWHT?

    What is the PWHT?

    I received an inquiry from UAE this week. The customer requires all products to be made PWHT, let’s see what is the PWHT? Post weld heat treatment (PWHT) process refers to a welding heat treatment process in which the welds are heated to a certain te ...
  • The introduction of fracture inspection

    The introduction of fracture inspection

    The fracture inspection is one of the methods to check the quality of steel pipeline products. There are mainly the following fracture types: ductile fracture, brittle fracture, porcelain fracture, lamellar fracture, stony fracture, graphite fracture, etc. ...
  • Why have steel price soared so fast recently?

    Why have steel price soared so fast recently?

    As a member of steel pipeline industry,many clients asked us why the price so higher for the steel pipes,pipe fittings,flanges and other related piping products.That is because the steel prices have soared so fast recently.Let’s see the detailed reas ...
  • The causes and prevention measures of bore formation in welding pipe

    The causes and prevention measures of bore formation in welding pipe

    The porosity of welding seam will not only affect the compactness of welding seam, cause pipeline leakage, but also become the inducing point of pipeline corrosion, and will reduce the strength and toughness of welding seam seriously. The main factors that ...
  • Steel prices rose to a 10-year high in China

    Steel prices rose to a 10-year high in China

    Some time ago, the price of sand skyrocketed on the hot search.But besides sand, the price of steel, another tough material for the infrastructure industry, has also soared. According to the data, since the start of construction after the end of this year, ...
  • A brief introduction of steel pipe lined with cement mortar

    A brief introduction of steel pipe lined with cement mortar

    As the pipeline has been buried in the ground for a long time, with the passage of time, the characteristics of the external soil and the settlement of the terrain will affect the corrosion, leakage, site, perforation and other factors of the pipeline, res ...