Which elements in EN10025-4 steel S275ML

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After adding phosphorus, copper, chromium, nickel and other trace elements to the steel, a dense and highly adherent protective film is formed on the surface of the steel, which hinders the spread and development of rust and protects the substrate under the rust layer to slow down its corrosion rate. The amorphous spinel-type oxide layer with a thickness of about 50μm-100μm formed between the rust layer and the substrate is dense and has good adhesion to the substrate metal.

Q235 steel grades cover Q235A, Q235B, Q235C and Q235D. Other than Q235A, the other three Q235 steel grades needs impact test. Charpy V-notch specimen is used for impact toughness test. The impact toughness index is Akv. Q235 steel plates are widely used because of its moderate carbon content, good comprehensive performance, good coordination of strength, plasticity and welding performance.

At the initial stage of corrosion, the rust layer on the surface of weathering steel is denser than that of carbon steel, EN10025-4 steel S275ML, and there are relatively few cracks and holes. After 25 days, delamination occurs in some parts of carbon steel and weathering steel, and there is no difference in corrosion products, mainly due to the role of alloy elements in the rust layer. The precipitation of Cu and Cr alloy elements in the weathering rust layer can resist the invasion of moisture and harmful ions in the atmosphere, and further corrosion of steel and base metal can be prevented, so as to achieve the effect of atmospheric corrosion resistance.

Seamless pipes material and specificationAPI 5L Gr.B, EN10025-4 steel S275ML A106 Gr.B, ASTM A53 Gr.B, ST37.0, ST35.8, St37.2, St35.4/8,St42,St45,St52,St52.4, STP G38, STP G42, STS42STPT49STS49Sizes(mm): 0.12-2.0mm*600-1250mmWall Thickness(mm):1.2mm-40mmCertificates: API5L ISO 9001:2008 TUV SGS BV etcSurface: Black painting, varnish paint, anti rust oil, hot galvanized, cold galvanized, 3PE

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