Chemical Composition Base Element Fe (Iron) C (Carbon) 0.56 to 0.64 % Fe (Iron) 96.1 to 96.9 % (estimate) Mn (Manganese) 0.7 to 1 % P (Phosphorus) 0.035 % (maximum) S (Sulfur) 0.035 % (maximum) Si (Silicon) 1.8 to 2.2 % Composition Note Fe is listed as a Base element for this material, but its % value is not listed in the specification. The value shown is a calculated one. Mechanical Properties Yield Strength 1080 MPa (minimum) Ultimate Tensile Strength 1230 MPa (minimum) Elongation 9 % strain (minimum) Brinell Hardness 363 to 429 Other Information Material Class Ferrous Alloy Alloy Family Carbon Steel Alloy Group High-carbon steel Alloy Sub-Group 1561 Country South Korea Standards Body KS (South Korea) Description Si-Mn steel, mainly use for lamella spring, coil spring, torsion bar spring. Designation SPS 4 Specification Type Standard Specification KS D 3701 Specification Year 2002 Specification Status Active Specification Status Notes Active Source Worldwide Guide to Equivalent Irons and Steels, 5th ed. ASM International 2006 Available forms Wrought Similar Alloys Click here to find similar alloys Links Organizations Osterreichisches Normungsinstitut (ON) (Austrian Standards Institute) (ONORM)
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Chemical Composition