Application of S355J2H Steel Pipe&SMLS and EFW on Offshore Platforms

S355J2H Steel Pipe,S355J2H SMLS Pipe,S355J2H EFW Pipe


There are two main types of S355J2H steel pipe, Electric fusion welding Pipe and Seamless Pipe are two common steel pipe materials, which have different manufacturing processes and application fields.
1. S355J2H Electric fusion welding Pipe: S355J2H refers to the grade of the steel, indicating that the minimum yield strength of the steel is 355MPa, and the “H” of the steel pipe represents “hollow”. S355J2H Electric fusion welding Pipe is manufactured by rolling hot-rolled or cold-rolled steel plates into tubular shapes and welding them at high temperatures. They can be welded through methods such as arc welding, high-frequency induction welding, laser welding, etc.
S355J2H Electric fusion welding Pipe has the following characteristics:
-Suitable for general structural purposes, such as buildings, bridges, mechanical equipment, etc.
-The manufacturing process is relatively simple and the production cost is low.
-The weld seam has high strength and is suitable for applications that withstand high pressures and loads.
-The size range is wide, and pipes with different diameters and wall thicknesses can be customized according to needs.
2. Seamless Pipe: Seamless pipe is a pipe made by heating the entire piece of steel to a sufficient high temperature and then piercing it through the process of stretching and rolling. Seamless pipes do not require welding processes, therefore they have the characteristic of no welds.
Seamless Pipe have the following characteristics:
-There are no pores or inclusions at the weld seam, which has higher strength and corrosion resistance.
-The inner surface is smooth and has low fluid resistance, making it suitable for conveying high-precision fluids and gases.
-Performs better in high-temperature and high-pressure environments, such as industrial fields such as oil, natural gas, chemical, and nuclear power.
It is important to choose appropriate steel pipe materials based on specific application requirements and process requirements. Electric fusion welding Pipe and Seamless Pipe have their own application advantages and applicability in different fields and scenarios.

S355J2H Steel Pipe

Chemical composition and mechanical properties of S355J2H steel pipe
The chemical composition and mechanical properties of S355J2H steel pipe are as follows:
Chemical composition:
-Carbon (C): not exceeding 0.22%
-Silicon (Si): not exceeding 0.55%
-Manganese (Mn): 1.60% to 1.80%
-Phosphorus (P): not exceeding 0.03%
-Sulfur (S): not exceeding 0.025%
-Chromium (Cr): not exceeding 0.30%
-Nickel (Ni): not exceeding 0.30%
-Molybdenum (Mo): not exceeding 0.08%
-Copper (Cu): not exceeding 0.55%
-Vanadium (V): not exceeding 0.20%
-Niobium (Nb): not exceeding 0.07%
-Titanium (Ti): not exceeding 0.03%
-Aluminum (Al): not exceeding 0.02%
-Additional elements: The total amount of molybdenum (Mo), lead (Pb), tin (Sn), antimony (Sb), arsenic (As), etc. shall not exceed 0.05%
Mechanical properties:
-Yield Strength: minimum 355 MPa
-Tensile Strength: 470 to 630 MPa
-Elongation: minimum 22%
-Impact Toughness: 20 ℃, minimum 27J
It should be noted that the above data are only general guidance values, and the actual chemical composition and mechanical properties may vary depending on different manufacturing standards and specifications.

Application of S355J2H Steel Pipe in Sea Working Conditions
The S355J2H steel pipe is relatively widely used in offshore conditions, especially in the fields of marine engineering and subsea oil and gas extraction. The following are the main applications of S355J2H steel pipes under some sea conditions:
1. Offshore platform structure: Offshore platform structures include drilling platforms, production platforms, gathering and transportation platforms, etc. These structures typically require the use of high-strength and corrosion-resistant steel pipes. S355J2H steel pipe has good mechanical properties and corrosion resistance, and can be used for manufacturing pile legs, support structures, protective pipelines, etc. of offshore platforms.
2. Submarine pipelines: Submarine oil and gas pipelines are key components that transport oil and gas from the seabed to land or other facilities. S355J2H steel pipe can be used to manufacture transmission pipe sections, connectors, and support structures for submarine pipelines. Due to the complex underwater environment, S355J2H steel pipe has high strength and corrosion resistance, and can withstand the requirements of seawater corrosion, high pressure, and external loads.
3. Ocean structural engineering: Ocean structural engineering includes ocean bridges, offshore wind power facilities, docks, and docks. In these projects, S355J2H steel pipes can be used to manufacture bridge support structures, wind turbine towers, dock facilities, and dock structures. Due to the complexity of the marine environment, S355J2H steel pipes need to have high strength, corrosion resistance, and fatigue resistance to ensure the safety and reliability of the structure.
Overall, the application scope of S355J2H steel pipe under sea conditions involves fields such as offshore platforms, submarine pipelines, and offshore structural engineering. Its high strength, good corrosion resistance, and reliable mechanical properties make it an important material choice in marine engineering. However, in specific applications, material selection and design need to be based on factors such as specific engineering requirements, environmental conditions, and safety standards.


Excellent manufacturer of flanges, butt welded pipe fittings, forged pipe fittings and pipe prefabrication in China.

Recent Posts


Contact Form Demo (#3)


Contact Form Demo (#3)