Yield strength of S355J0WP steel

The chemical composition of S355J0WP steel mainly includes carbon (C), silicon (Si), manganese (Mn), phosphorus (P), sulfur (S), copper (Cu) and other elements, and may also include chromium (Cr) and nitrogen ( N). The specific ingredient content may vary according to different standards or production batches, but generally speaking, the range of its chemical ingredients can be summarized as:

Carbon (C) content is less than or equal to 0.12%-0.15%
Silicon (Si) content is less than or equal to 0.50%-0.80%
Manganese (Mn) content is less than or equal to 1.60%-1.1%
Phosphorus (P) content is less than or equal to 0.025%-0.05%
Sulfur (S) content is less than or equal to 0.020%-0.040%
Copper (Cu) content is less than or equal to 0.55%
Chromium (Cr) content between 0.25%-1.35% (according to some standards)
Nitrogen (N) content is less than or equal to 0.010% (according to certain standards)
In addition, the mechanical properties of S355J0WP steel also vary depending on its thickness. Generally speaking, its yield strength is between 325MPa and 355MPa, its tensile strength is between 470MPa and 630MPa, and its impact energy is greater than or equal to 27J.

The yield strength and tensile strength of S355J0WP steel are two important indicators of material mechanical properties, and there are obvious differences between them.

Yield Strength: Yield strength refers to the stress value at which a material begins to undergo significant plastic deformation when subjected to external force. For S355J0WP steel, its yield strength varies according to thickness. Generally speaking, the yield strength of steel plates with a thickness of 3 to 16 mm is greater than or equal to 355MPa; the yield strength of steel plates with a thickness of 16 to 40 mm is greater than or equal to 345MPa; the yield strength of steel plates with a thickness of 40 to 63 mm is greater than or equal to 345MPa. The yield strength is greater than or equal to 335MPa; while the yield strength of steel plates with a thickness between 63 and 80 mm is greater than or equal to 325MPa. Yield strength is an important basis for considering the material's ability to resist plastic deformation during structural design.

Tensile Strength: Tensile strength refers to the maximum stress value that a material can withstand during the stretching process, that is, the maximum stress reached before the material is pulled apart. For S355J0WP steel, the tensile strength usually ranges from 470MPa to 630MPa, and the specific value may also vary depending on material thickness and other factors. Tensile strength is an important indicator for evaluating a material's ability to resist tensile fracture.

The yield strength and tensile strength of S355J0WP steel are key parameters to measure the mechanical properties of materials, but their physical meanings and application scenarios are different. Yield strength focuses on the point at which a material begins to plastically deform during stress, while tensile strength focuses on the ultimate load-bearing capacity of a material during stretching. In the process of structural design and material selection, both indicators need to be comprehensively considered to ensure the safety and reliability of the structure.