Our company, Hebei Haihao Group, was established in 1982, with nearly 40 years of production experience. In the early days of the establishment of the company, we are committed to providing customers with the source of products, do not let the middlemen la ...

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 ...

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 ...

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 ...

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 ...

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 ...

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 ...

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 ...

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 ...

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 ...

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 ...

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 ...

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 ...

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 ...

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 ...

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 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. ...

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 ...

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 ...

I received an inquiry from a customer in Brazil as follows,”FLANGE BLIND, DN 6IN, ASME B16.5, 150LBS ASTM A105N RF, INTERNAL COATED WITH STELLITE”. About STELLITE,let’s learn about it. Stellite alloy is a kind of hard alloy that can resis ...