The Chemical Composition of SAPH400 Steels: JIS G 3113 defines the chemical composition of SAPH400 steels as under:
Carbon (C) is not identified in the standard.
Manganese (Mn) is not identified in the standard.
Maximum percentage of Phosphorous (P) is 0.040 percent.
Maximum percentage of Sulphur (S) is 0.040 percent.
Remaining is iron (Fe) percentage and with few negligible impurities.
Mechanical Properties of SAPH400 Steels: The tensile strength of the SAPH400 Steels is expressed in Newton per millimeters and it must be at-least 400 N/mm2 (MPa). The yield strength is minimum 235 to minimum 255 N/mm2 (MPa) depending on the thickness. The elongation property of SAPH400 steel varies with the ranges of thickness. The minimum percentage ranges for elongation is 32 to 36 minimum. Only over 6.5 mm thickness requires 24 minimum percentage elongations.
Some other hot rolled commercial quality materials are also used in industrial applications, SPHC steel comparison with this grade of SAPH400 material will show how structural automobile hot rolled steel differs with commercial quality SPHC steel in chemical composition & mechanical properties.