STEEL FOR SPRING, AND METHOD FOR PRODUCING SPRING

• Main Authors: ENDO, SHIGERU, UWAI, KIYOSHI, TANGE, AKIRA, TSURU, KOEI, FUJIE, KEIICHI, HONJO, MINORU, YAMASHITA, KATSUTOSHI
• Format: Patent
• Language: English; French; German
• Published: 20.07.2016
• Subjects: ALLOYS; BLASTING; CHEMISTRY; ENGINEERING ELEMENTS AND UNITS; FERROUS OR NON-FERROUS ALLOYS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUSMETALS OR ALLOYS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS; HEATING; LIGHTING; MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS; MEANS FOR DAMPING VIBRATION; MECHANICAL ENGINEERING; METALLURGY; METALLURGY OF IRON; MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; SHOCK-ABSORBERS; SPRINGS; THERMAL INSULATION IN GENERAL; TREATMENT OF ALLOYS OR NON-FERROUS METALS; WEAPONS

Provided is high strength steel for springs that, compared to conventional high strength steel for springs, has excellent decarburization resistance and scale exfoliation property, by optimization of the added amounts of C, Si, Mn, and Cr as well as of Sb and Sn. The steel for springs contains C: more than 0.45 mass% and less than 0.65 mass%, Si: 0.15 mass% or more and 0.70 mass% or less, Mn: 0.10 mass% or more and 1.00 mass% or less, Cr: 0.20 mass% or more and 1.50 mass% or less, P: 0.025 mass% or less, S: 0.025 mass% or less, O: 0.0015 mass% or less, Sb: 0.010 mass% or more and less than 0.030 mass%, and Sn: 0.010 mass% or more and 0.030 mass% or less, under predetermined conditions.