Manganese (Mn) is a crucial alloying element in steel, playing a vital role in enhancing its strength, hardness, and wear resistance. It also significantly improves steel’s hardenability, which is essential for heat treatment processes, and assists in the deoxidation and desulfurization of steel ...
Silicon is primarily used in steel as a deoxidizer, effectively removing oxygen and improving the purity of the steel. In addition, silicon enhances the strength, hardness, and elastic limit of steel, improving its wear resistance and oxidation resistance. However, excessive silicon content can ...
Carbon plays a crucial role in balancing the strength and toughness of steel. Proper control of carbon content is a core aspect of steel design and production. As carbon content increases, the hardness of steel also increases, but this comes at the expense of plasticity and toughness. For instan ...
Hydrogen is one of the most harmful elements in the steelmaking process, significantly affecting the material’s properties. The primary concern with hydrogen in steel is its tendency to cause hydrogen embrittlement, which makes the steel brittle and drastically reduces its ductility and to ...
Haihao Group, a prominent player in the pipeline systems industry for over 40 years, has been involved in numerous domestic and international pipeline projects. One notable project was the P-82 FPSO, where we supplied a significant amount of pipeline system components. With our deep interest in ...
During the past week, prices in the domestic raw material market continued to decline across various categories, with some experiencing even larger drops. Iron ore prices saw a significant decline, while coke prices remained stable with slight drops. Coking coal prices mostly fell, and most ferr ...
Haihao Group, as an expert in the piping systems field, is dedicated to providing high-quality piping system products and services for projects worldwide. We closely monitor the latest developments in global oil and gas projects and share timely updates with our clients. Recently, BP announced a ...
On July 26, the Ministry of Industry and Trade of Vietnam issued Announcement No. 1985/QD-BCT, stating that it has initiated an anti-dumping investigation on hot-rolled coils originating from China and India. This action was taken in response to a request from Vietnamese manufacturers.
Carbon st ...
Haihao Group closely monitors the fluctuations in the raw materials market, ensuring that we remain informed about key industry trends and developments. This vigilance allows us to adapt swiftly to changing conditions, safeguarding our ability to provide high-quality products and services to our ...
Socket weld fittings, machined from round steel or steel ingots through forging, are essential components for piping connections. These fittings use a connection method called socket welding (SW), where a pipe is inserted into a recessed area of the fitting and then welded. This design ensures a ...
With increasing environmental protection pressures, using long-distance or ultra-long-distance hot water pipelines to transport industrial waste heat from power plants, steel mills, chemical plants, and other industries to cities for centralized heating has become a popular method in the heating ...
In the installation and construction of petrochemical equipment, specific cleanliness requirements are often mandated by system design, such as the need to avoid oils and contaminants. This necessitates special treatments of the equipment’s internal surfaces, including degreasing, pickling ...
1.Concept of Heat Treatment
Heat treatment involves heating metal to a specified temperature, maintaining it for a period, and then cooling it at a controlled rate to achieve desired microstructures and properties. In construction, heat treatment typically refers to the heat treatment of weld jo ...
The corrosion allowance of a pressure vessel refers to the extra thickness or capacity reserved in the vessel design in order to prevent and mitigate the impact of corrosion on the performance of the pressure vessel when designing and manufacturing the pressure vessel. This design consideration ...
Pressure vessels are essential components in various industrial applications, designed to hold gases or liquids at a pressure substantially different from the ambient pressure. Their classification is crucial for selecting the appropriate design, materials, and safety measures. Here’s an o ...
Non-destructive testing (NDT) methods are essential tools in the inspection and quality control of materials and structures without causing any damage. Here, we explore several key NDT techniques: Radiographic Testing (RT), Ultrasonic Testing (UT), Eddy Current Testing (ET), Magnetic Particle Te ...
EN 10204 is a European standard that defines the types of inspection documents supplied to the purchaser for the delivery of all metallic products, such as plates, sheets, bars, forgings, and castings, regardless of the manufacturing method. This standard ensures that different types of inspecti ...
Stainless steel is an alloy steel with high chromium and nickel content. It is generally categorized based on its corrosion resistance: stainless steel resists atmospheric corrosion, while acid-resistant steel withstands corrosion from acids and other highly corrosive media. These types are comm ...
As a strategic supplier for CNOOC, Haihao Group is delighted to see CNOOC’s recent accomplishments in the international oil and gas industry. China National Offshore Oil Corporation (CNOOC), through its subsidiary Offshore Oil Engineering Co., Ltd. (COOEC), has secured the EPCIC (Engineeri ...
From July 8 to July 12, the China Steel Price Index (CSPI) dipped again after a slight recovery the previous week, hitting a new low since the beginning of the year. Both the long products and flat products price indices declined.
Haihao Group
Weekly Index Performance
During the week, the CSPI s ...
The criteria for determining whether full (100%) or partial radiographic or ultrasonic inspection should be performed are outlined in section 10.3 of GB/T 150-2011 “Pressure Vessels.”
Pipe fitting ready for radiographic test
Full (100%) Radiographic or Ultrasonic Inspection
Pressure ...
Recently, the forebody of FPSO N1151 (P-82) was successfully launched at ZPMC Qidong Marine Engineering! The main hull of the FPSO N1151 project is constructed by Qidong COSCO Marine Engineering. This FPSO boasts a total length of 360 meters, a beam of 60 meters, and a depth of 34.3 meters, with ...
When designing pressure vessels, stainless steel is a commonly used material. For products that require resistance to corrosion or specific operating conditions, pickling and passivation are essential processes.
Stainless steel pipe fittings
Why pickling and passivation are necessary?
During the ...
In June, the domestic market for cold and hot rolled coils exhibited signs of weakness, with a decline in demand and fluctuating steel prices. For instance, in the Shanghai market, the price of 1.0 mm cold rolled steel (ST12) from Ansteel dropped from 4380 RMB/ton at the beginning of the month t ...
