What is tensile strength and equivalent of JIS SS400 steel
Structural steel in foreign standards is usually classified according to tensile strength, such as JIS SS400 steel (as marked in Japan), where 400 means the minimum value of σ b is 400MPa.
When the specimen is in tension, the stress obtained by dividing the maximum load before breaking by the original cross-sectional area is called the tensile strength, which is expressed by σ b. When the external stress of the material is greater than its tensile strength, it will break. Therefore, the higher σ b is, the greater the external stress it can bear without fracture.
JIS SS400 steel is basically the same as Q235B in China, but there are some differences in specific indicators. Q235B steel requires the contents of C, Si, Mn, s, P and other elements, but JIS SS400 steel only needs S and P less than 0.050. The yield point of Q235B steel is more than 235 MPa, while that of SS400 steel is 245 MPa. JIS SS400 steel means general structural steel with tensile strength greater than 400MPa. Q235B means ordinary carbon structural steel with yield point greater than 235MPa. The standard number of SS400 is JIS g3101. The standard number of Q235 is GB / T700.