ASTM A320 - L43 / 40NiCrMo7

PROPERTIES AND EMPLOYEMENTS
IT IS AN ALLOY STEEL WITH ELEVATED RESISTANCE AND GOOD TOUGHNESS. IT IS EMPLOYED WHEN IT IS NECESSARY TO HAVE ELEVATED CHARACTERISTICS THAT ARE MORE ELEVATED THAN THOSE OFFERED BY 39NiCrMo3, ESPECIALLY FOR PARTS OF REMARKABLE THICKNESS.
IT HAS A VERY ELEVATED HARDENABILITY, IN FACT THOSE PARTS OF SMALL DIMENSIONS (Ø < 15 MM) CAN BE HARDENED IN AIR. IT IS SUITABLE FOR SUPERFICIAL HARDENING WHERE IT REACHED A HARDNESS OF 54÷59 HRC ACCORDING TO CARBON CONTENT.
IT HAS AN ELEVATED FATIGUE STRENGTH UP TO A TEMPERATURE OF 450°C MORE OR LESS AND IT BEHAVE VERY GOOD EVEN AT A LOW TEMPERATURE. IT CAN BE SUBMITTED TO HEAT TREATMENT OF NITRIDING, REACHING A REMARKABLE INCREASE IN THE FATIGUE LIMIT AND ELEVATED SUPERFICIAL HARDNESSES. DUE TO ITS ELEVATED HARDENABILITY, IT IS GENERALLY DESTINED TO THE CONSTRUCTION OF PARTS OF RELEVANT DIMENSIONS THAT WORK IN HEAVY CONDITIONS, FOR EXAMPLE TREES FOR HYDROELECTRIC TURBINES. IT IS SUCCESSFULLY EMPLOYED FOR BOLTS AT HIGH RESISTANCE.

CORRESPONDENCE TO INTERNATIONAL DESIGNATIONS

CHEMICAL ANALYSIS (ASTM A 320)

CONCENTRATION LIMITS OF THE ELEMENTS THAT ARE NOT INDICATED IN THE TABLE CAN BE DEDUCED IN THE EN 10020 REGULATION.

MECHANICAL CHARACTERISTICS

USUALLY AVAILABLE EX STOCK

M.T. COLORATION	QUALITY	HEAT TREATMENT	SURFACE	DIAMETER (mm)
	L43	Quenched and tempered	rolled / peeled	40-300

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