Hebei Haihao Group has received for DNV certificate, and the DNV approves and confirms that Hebei haihao complies with international standards, regulations or recognized DNV rules . This provides Hebei haihao group with proof of high quality and safety sta ...

Haihao Group is committed to providing the best quality ASTM A182 F316L flanges and fittings. 316L stainless steel added Mo, so its corrosion resistance, atmospheric corrosion resistance and high temperature strength is particularly good, can be used in ha ...

HEBEI HAIHAO GROUP While serving the high-end market, we also pay strict attention to quality, and conducting product testing in CNAS laboratory with DNV’s most professional team is undoubtedly the best interpretation of our products Laboratory test ...

With the singapore shipyard order,the material is CONTEN A (S355 JOWP ) , we doing test at CNAS lab .Today we learn about DNV 3.2 test . DET NORSKE VERITAS (DNV) is an independent and autonomous foundation whose goal is to protect life, property and the en ...

After the perfect delivery of the DNV 3.2 test S355 JOWP pipe order, the customer gave the order of flange. Raw materials and steel pipe orders are the same S355 JOWP ( corten A). DNV 3.2 Test Result : Chemical composition of the product analysis: C Mn ...

Recently,I received a inquiry form singapore shipyard ,in the inquiry , the material is CORTEN A (S355 JOWP ) , The product is steel pipe in standard ASME B36.10 .  Today we learn about the material Corten A ( S355 JOWP ). Corten A Weathering Steel ASTM Co ...

Today I received a inquiry from Singapore, he need stainless steel sweepolet. Today let’s learn about what’s the sweepolet. What is a Sweepolet? Sweepolet is a contoured, integrally reinforced, butt-weld branch connection with a low stress inte ...

Under the action of capillarity, penetrant penetrates into the surface opening defect;  After removing the excess penetrant on the surface,the penetrant in the defect is absorbed through the capillary action of the imaging agent, forming traces and showing ...

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 ...