Germany 15NiCR13
According to national standard GB1222-84 standard, alloy spring steel, including 55SiMn, 60Si2Mn, 30W4Cr2VA other 13 grades. c. the main characteristics and uses as the spring in the shock, vibration or long-term use of alternating stress, requiring a special spring steel used to manufacture springs with high tensile strength, elastic limit and fatigue strength, while also requiring a certain hardenability. Alloy carbon spring steel of slightly lower (not higher than 0.64%), mainly by increasing silicon content, adding a small amount of alloying elements chromium, molybdenum, vanadium, boron, tungsten (usually no more than the total content of 212%) to improve performance . There are varieties of spring steel hot-rolled steel round bar, square steel, cold drawn round steel, hot-rolled flat steel, rod and wire, etc. Hot-rolled steel to heat treatment.
