A350 LF3 Socket Welding Flanges are American standard low temperature steel flanges, and the executive standard is ASTM A350 / a350m-2018
A350 LF3 Socket Welding Flanges include LF1, LF2, LF5, LF6, lf9 and lf787 in addition to LF3. LF2 for - 46 ℃ and LF3 for - 101 ℃ are commonly used. There is no standard for low-temperature carbon steel for valves and pipe fittings in China for low-temperature forged steel. Generally, the materials and technical requirements inA350 LF3 Socket Welding Flanges are directly adopted. There is a standard JB / t7248 "technical conditions for low temperature steel castings for valves" for low temperature steel casting materials, but this standard is also a reference from the United States, which is equivalent to the corresponding brand and requirements in ASTM a352.
A350 LF3 Socket Welding Flanges are carbon steel and low alloy steel flanges requiring notch toughness test for pipeline components
The chemical composition of A350 LF3 Socket Welding Flanges is as follows:
Welding problems of A350 LF3 Socket Welding Flanges
The key factor for the generation of welding residual stress and welding analysis of A350 LF3 Socket Welding Flanges is the input type of heat source. Different heat source models often lead to different distribution of welding temperature field, which in turn leads to different distribution of welding residual stress; Second, the influence of temperature on the mechanical properties and thermophysical properties of materials. The linear expansion coefficient (which varies with temperature) is often an important parameter to determine the welding thermal stress and strain, and the thermal diffusivity is often an important parameter to affect the distribution of the welding temperature field. With the rapid development of new technology, new technology and modern industrial production, the elimination of welding residual stress requires higher reliability, economy and quality of welding technology. Therefore, it is necessary to eliminate the influence of welding residual force to improve welding technology.
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