Recently one of Singapore customer inquiry some pipes, fittings and flanges, most items material it’s Super Duplex Stainless 32750.We offered the price and got the order as per this material. But when we arrange the production. The customer inform th ...

We closed a deal with a Korean customer at the beginning of the year.  The Korean customer has strict requirements. Before placing the order, we inspected the factory twice and conducted strict tests on the samples, including product size, thickness, appea ...

Duplex stainless steels are a family of grades combining good corrosion resistance with high strength and ease of fabrication.Their physical properties are between those of the austenitic and ferritic stainless steels but tend to be closer to those of the ...

Duplex stainless steel (DSS) refers to stainless steel in which ferrite and austenite account for about 50% respectively. Generally, the content of less phase also needs to reach 30% at least. When the content of C is low, the content of Cr is 18% ~ 28%, a ...

As mentioned in the previous article, our company and the customer finally determined the final test method. In order to ensure the quality of products and improve the customer’s trust in our company, all the manufacturing materials are directly take ...

Following the previous article, I continued to introduce the progress of the Indonesian order. After reaching an agreement with the customer to do ASTM G48 C experiment, the customer proposed to change it to ASTM G48 A. You must be curious about why the cu ...

In addition to ASTM A923 C mentioned above, the customer also provided another pitting test method, namely ASTM G48 C. In order to better understand the difference between the two, I now introduce ASTM G48 C. Method C – Critical Pitting Temperature T ...

The ferrite experiment was introduced in the first part. The experiment went well, but the pitting experiment was more twists and turns. Initially, the customer provided two tests: ASTM A923 C or ASTM G48 C. First, I will introduce ASTM A923 C, then ASTM G ...

Since the customer has such high requirements on the corrosion resistance of the material, it is natural that we are required to do pitting experiments after the production of the product, so as to verify the real corrosion resistance of the product. About ...

In the last article, we mentioned that our technical staff advised the customer to use S32205 instead of S31803. To introduce the difference between the two, we first need to introduce the metallographic structure and corrosion resistance of dual-phase ste ...

In mid-April,a new customer from Indonesia came to me and asked me to quote for his order of duplex stainless steel, which included steel pipes, pipe fittings and flanges. How did the client find me? Because when he searched online related keywords such as ...

Hebei Haihao Group is a manufacture specialized in producing flange, pipe fittings and steel pipe. Seamless steel pipes are everywhere in our life. The manufacturing process of seamless steel tube begins with solid round billet. Then the billet is heated t ...

Hebei Haihao Group is a professional manufacturer of flanges and pipe fittings. We not only have strong technical force, can produce standard, non-standard and customized high, medium, low pressure various specifications, various series of pipe fittings fo ...

Haihao Group is committed to providing the best quality tees,which contain equal tee and reducing teem,according to different production method it can be divided into butt weld tee and forged tee. The main function of tee is to change the direction of the ...

As shown, part of the forgings produced for the Russian order and part of the pipe fittings are in production. The sudden outbreak of the Russia-Ukraine war disturbed the pattern of world trade. Trade related to the war, orders that are being negotiated, o ...

If shown, the steel pipes in the picture are a batch of pipeline steel pipe orders from old customers in Belarus that were completed a few days ago. This batch of steel pipe is used in the local project and has certain requirements for the product. Since w ...

In December, an old Brazilian customer ordered a batch of elbows that were different from the regular elbows in each order.The products were ASTM A234 WPB 90 degree long radius reducing elbows according to ASME B16.9 standard. This batch of pipe fittings h ...

Recently, our factory received a batch of orders for carbon steel 2D and 3D pipe bends, and produced a batch of 400NB thick elbows with high quality. At the request of the customer, the exterior is painted with anti-rust oil, the pallet is packaged, and re ...

Recently, the carbon steel, alloy steel and stainless steel flange,pipe fittings produced by Hebei Haihao Group have obtained the certification of DNV and the relevant certificates approved and issued by the headquarters of DNV. This is another classificat ...

Last week we received an inquiry from a customer about plastic steel lined pipes. The details of the inquiry are: 2 “, 3 ” and 4″ with wall thickness of SCH40 and length of 6 meters. However, in the follow-up communication process, we lea ...