P235GH and P355GH materials are pressure vessel steels, also known as boiler sheets. Considering the general properties, it is seen that both materials have good weldability. In addition, they can withstand high pressure.
P235 grade material is in the unalloyed steel group. This material is used as an auxiliary part while producing boilers in industrial areas. Erdemir in Turkey is produced only by the 6335 code this material. The people who sell it also buy from here. The maximum percentage of carbon in it is 0.16, the manganese ratio is between 0.6 and 1.20, the phosphorus ratio is 0.025 and the sulfur ratio is 0.015. Apart from this, there are also elements such as nickel, molybdenum, copper and titanium. Tensile strength is between 360 and 500 MPa. The yield strength is between 215 and 235 MPa and decreases with increasing thickness. It is a suitable material for cold forming.
P355GH quality material is used in the production of pressure vessels and pipes carrying hot liquids. Its carbon content is higher than P235. It is among the groups of creep resistant and high temperature steels. It is produced according to the EN 10028-2 standard. It contains elements such as 0.08-0.2 carbon, 0.4 silicon, 0.9-1.5 manganese, and 0.3 carbon.
Yield and tensile strength varies depending on thickness. As the thickness increases, the yield strength decreases. It is generally between 280 MPa and 355 MPa. Yield strength is one of the determining mechanical properties for materials to be used in production. It is desirable that the yield strength of the materials that will carry the load should be high. However, it is not desired that materials to be subjected to shaping have high yield values. By dividing the yield strength by the tensile strength, the value that determines the shape ability of the material is found. The tensile strength of P355 quality material varies between 470 MPa and 650 MPa. Percent elongation amount is 20%.
P235GH to P355GH Heat Resistance
While P235 material can withstand temperatures of 150-200 degrees, P355 material remains intact even at temperatures of 400 degrees. Due to this feature, it is used in the production of materials that will be exposed to high temperatures such as boilers and pipes. P235 is used as an auxiliary, not the main material, during boiler production.