After steel rolling, various cooling methods can be employed to achieve desired material properties. These methods include cooling in air, low thermal conductivity materials, insulation boxes, unheated insulation pits, preheating insulation pits and furnaces, heated insulation pits and furnaces, ...
During the hot working process, the deformation termination temperature has an important influence on the structure of steel. The higher the deformation termination temperature, the stronger the tendency of grain aggregation and growth, and the resulting austenite grains will be coarser, so it s ...
In the intricate web of pipeline systems, every component plays a crucial role in ensuring efficiency, durability, and safety. At Haihao Group, we understand the significance of each bolt, nut, flange, or pipe fittings in the grand scheme of pipeline operations. It is with great pride that we in ...
When it comes to high-pressure and high-temperature environments, precision and durability are paramount. Enter ASTM A194, the standard encompassing carbon, alloy, and stainless steel nuts designed to excel in demanding conditions. Let’s delve into the specifications and applications of th ...
During the week of April 22nd to April 26th, domestic steel prices experienced a moderate rebound, marking the third consecutive week of increase. Both long and flat steel prices showed signs of recovery.
The China Steel Price Index (CSPI) for the week stood at 106.78 points, with a weekly incre ...
April 29th marked a historic moment in the maritime industry as China Shipbuilding Group and Qatar Energy Group convened in Beijing for the signing ceremony of an unprecedented order: 18 of the world’s largest 271,000 cubic meter ultra-large liquefied natural gas (LNG) carriers. This monum ...
As an expert in the field of piping systems, Haihao Group is proud to announce that our piping system accessories have been certified by well-known classification societies such as ABS, DNV, BV, RINA, and RS. Our pipeline system products are widely used in the pipeline systems of large ships suc ...
As a longstanding expert in the field of pipeline systems, Haihao Group not only manufactures high-quality pipeline system accessories but also boasts an experienced technical team proficient in various welding techniques. One of these techniques, tungsten inert gas welding (TIG), also known as ...
Distinguishing between quenching cracks, tempering cracks, forging cracks, and grinding cracks is pivotal for pinpointing the exact stage where the cracks occur, facilitating a thorough analysis of the underlying causes.
First and foremost, pay attention to the distinctive characteristics of que ...
Recently, Haihao Group conducted hardness tests on pipe fitting product test blocks ordered by a group of Russian customers. We would like to take this opportunity to introduce several commonly used equipment for hardness testing.Hardness testing equipment, known as hardness testers, are essenti ...
Hardness refers to a material’s resistance to local deformation, especially plastic deformation, indentation, or scratching. Hardness testing is the most widely used mechanical performance test, categorized into indentation and scratch methods. Within indentation methods, there are static ...
The ability of a material to resist impact loads is known as its impact performance. Impact load refers to the load applied to a component at a high velocity. When a component is subjected to an impact load, the stress and deformation caused by the instantaneous impact are much greater than thos ...
The American Society for Testing and Materials (ASTM) sets standards for steel and iron material pipeline fittings. ASTM standards specify the manufacturing processes and precise chemical composition requirements for steel pipes, fittings, and flanges, including the percentages of carbon, mangan ...
Thermal performance testing is a method of inspecting product quality by using thermal instruments to determine the thermal properties of products. The thermal characteristics of products mainly include melting point, freezing point, boiling point, heat resistance, thermal conductivity, thermal ...
In recent years, shale gas development in China has progressed rapidly. In early April, China Petrochemical Corporation announced the successful completion of the trial gas production from the first set of conventional pressure shale gas wells in Daozhen County, Guizhou Province. The Zhenye 1 we ...
In the world of metal surface treatments, two popular methods stand out: cold galvanizing and hot-dip galvanizing. While both processes aim to protect metal from corrosion, they differ significantly in their application techniques, properties, and uses. Let’s delve into the distinctions be ...
Haihao Group has been committed to providing customers with high-quality pipeline system products and paying close attention to changes in the steel raw material market. The latest market conditions show that the domestic scrap steel market first strengthened and then weakened from March 23 to M ...
At Haihao Group, we pride ourselves on being the go-to destination for customized pipeline solutions. As experts in the field of pipeline systems, we specialize in manufacturing a wide range of products tailored to our customers’ unique requirements.
Recently, a valued client from Brazil a ...
Haihao Group, with certifications from ABS, DNV, RINA, BV, RS, and other major classification societies, has seen its pipeline system products increasingly utilized in the pipeline systems of large vessels. We are closely monitoring the latest developments in the world of FPSOs and are ready to ...
S355JR, like S355J0 and S355J2, belongs to the European standard EN10025 for low-alloy high-strength structural steel. Each variant represents a different impact temperature, S355JR represents room temperature impact, S355J0 represents 0 degree impact, and S355J2 represents -20 degree impact.
Th ...
In the first half of March, the cold and hot rolled coil markets in the Shanghai region showed no signs of improvement. Taking specific varieties as examples, the price of 1.0mm cold rolled sheets produced by Angang Steel dropped from 4,810 yuan/ton on March 1st to 4,620 yuan/ton on March 20th, ...
In the realm of pipe fittings, two primary manufacturing processes stand out: seamless and welded. Understanding the differences between these methods is crucial for selecting the right components for various industrial applications. Let’s delve into the distinctive production techniques o ...
At Haihao Group, we remain vigilant about market dynamics, especially in terms of raw materials, to provide our customers with the best solutions. Recently, according to the China Steel Price Index (CSPI) weekly report from March 11 to March 15, domestic steel prices continue to fall sharply, an ...
At Haihao Group, our dedication to excellence extends beyond producing high-quality pipeline system components. We pride ourselves on our mastery of various welding and surface treatment techniques, allowing us to meet the diverse needs of our customers effectively.
Weld Cladding Piping Products ...
