Haihao Group is proud to announce the successful delivery of a batch of ASME B16.9 ASTM A815 UNS S32750 seamless 90-degree elbows to our Singapore customer. These high-performance elbows are designed for use in critical applications requiring excellent corrosion resistance and mechanical strengt ...
At Haihao Group, we specialize in providing high-quality pipeline solutions tailored to the specific needs of our global customers. Recently, we completed a significant order for our UAE customer, delivering ASME B16.9 A815 Gr.S31803 seamless concentric reducers. These reducers are designed to m ...
The MSS SP-97 threaded outlet is a type of reinforcement pipe fitting used for branch connections, commonly referred to as a threaded olet. It provides a modern solution for connecting branch pipelines, serving as a replacement for traditional methods such as reducing tees, reinforcement plates, ...
Overlay welding is a welding process used to increase or restore the size of a component or to provide its surface with a layer of deposited metal possessing special properties. This technique enhances the surface of components with characteristics such as wear resistance, heat resistance, corro ...
At Haihao Group, we are proud to support the LNG (Liquefied Natural Gas) industry in the Middle East with our high-quality steel pipes. These pipes, inspected and certified by Bureau Veritas (BV) surveyors, meet the rigorous demands of marine and energy projects. As specialists in Marine enginee ...
In our latest order for a domestic client, Haihao Group produced a variety of pipeline components, including ERW pipes and seamless pipes, tailored to meet the project’s unique requirements. The ERW pipes came with beveled ends (BE), while the seamless pipes featured threaded ends (THD). Underst ...
Heat treatment is a crucial process in metallurgy that significantly influences the mechanical properties and structural integrity of metals. Among the various types of heat treatments, normalizing stands out as a fundamental technique used to enhance the performance of steel components. For our ...
Weld porosity, a common defect in welded joints, occurs due to the entrapment of gases in the molten metal during the welding process. The formation of porosity is influenced by a variety of factors, including metallurgical and process-related elements. Understanding these factors is crucial in ...
As an integrated supplier of pipeline system products, Haihao Group often assists clients with welding services for pre-fabricated pipeline products. Our expertise in various welding techniques and practices allows us to address common welding challenges, one of which is weld porosity. This arti ...
At Haihao Group, we’re excited to announce that a shipment of large-size welded pipes, manufactured to ASME B36.10M specifications and made from A516 Grade 70 carbon steel, is now ready for dispatch to Italy. These pipes are designed to meet the needs of industries requiring robust, high-p ...
At Haihao Group, we pride ourselves on providing premium pipeline solutions tailored to the needs of industries worldwide. Recently, we successfully completed the shipment of several containers filled with top-quality carbon steel pipe fittings, flanges, and pipes to Brazil. This shipment includ ...
In the production of high-quality steel products, controlling the levels of sulfur and phosphorus is crucial, as these elements can negatively impact the material properties, such as ductility, toughness, and overall strength. Sulfur, being a harmful impurity, can cause hot cracking during weldi ...
NACE MR0175, also known as ISO 15156, is a globally recognized standard that specifies the requirements for materials used in oil and gas environments containing hydrogen sulfide (H₂S), which can lead to sulfide stress cracking (SSC) and other types of corrosion. Established by NACE Internationa ...
Why Solution Treatment Matters in Pipe Fitting Manufacturing
In pipeline construction, stainless steel fittings occasionally suffer from stress corrosion cracking. One common cause is the omission of solution heat treatment during production—a shortcut some manufacturers take to cut costs. Howev ...
Haihao Group, a leader in the field of piping systems, proudly offers the A182 F347H forged lateral tee, designed to meet the rigorous demands of various industries, including nuclear energy and aerospace. This product exemplifies our commitment to quality and reliability, providing exceptional ...
A182 F347H is a high-performance stainless steel alloy known for its excellent mechanical properties and corrosion resistance, making it suitable for various demanding applications, particularly in the chemical processing, nuclear power, and aerospace industries. This article will delve into the ...
The Abu Dhabi International Petroleum Exhibition & Conference (ADIPEC), founded in 1984, is recognized as one of the world’s most significant events for the oil and gas industry. Held annually, ADIPEC has become a vital platform where global energy leaders, technical experts, and indus ...
Welding stress and distortion arise from the welding process as internal stresses and changes in the shape and size of the welded components. Uneven temperature distribution during welding, local plastic deformation, and variations in volume are the primary causes of these stresses. Initially, t ...
Welding stress can have significant negative effects on the integrity and durability of welded structures. Understanding these hazards is crucial for preventing structural failures and ensuring the quality of welded components.
stress corrosion cracking
1.Causing Welding Cracks
Welding stress, w ...
Welding stresses are stresses present in welded structures, and they can be categorized based on their causes and nature. Here are the main types:
1.Thermal Stress
Thermal stress arises due to uneven heating and cooling during the welding process. It is an instantaneous stress that varies as the ...
Large diameter straight seam submerged arc welded (LSAW) steel pipes are primarily used for the transportation of various media, including oil, gas, coal, and slurry, both offshore and onshore. The international manufacturing techniques for these pipes vary in method and characteristics. Current ...
In previous articles, we covered the difference between ERW and LSAW steel pipes. Now, let’s introduce another type: spiral submerged arc welded (SSAW) steel pipes.
SSAW steel pipes are manufactured by winding the pipe material at an angle to the centerline of the forming pipe, creating a spiral ...
When selecting steel pipes for large-scale oil, gas, and water transmission projects, two common types are ERW (Electric Resistance Welded) pipes and LSAW (Longitudinal Submerged Arc Welded) pipes.Each type has distinct features, manufacturing processes, and application scenarios. At Haihao Grou ...
Large diameter straight seam steel pipes are essential components in modern infrastructure, widely used in industries such as oil and gas, water transmission, and urban pipeline networks. These pipes feature a weld seam that runs parallel to the pipe’s longitudinal axis, creating a straigh ...
