• Uncompromising quality

  • Uncompromising quality

  • Uncompromising quality

  • Uncompromising quality

  • Uncompromising quality

  • Uncompromising quality

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

QUALITY EUROPE GERMANY FRANCE SPAIN G.B. USA
EN DIN W.n. AFNOR UNE B.S. AISI/SAE
L43 40NiCrMo7 40NiCrMo8-4 1,6562     817M40 4340

CHEMICAL ANALYSIS (ASTM A 320)

STEEL DESIGNATION CHEMICAL COMPOSITION
SYMBOLIC NUMERIC C Mn Si P
max
S
max
Cr Mo Ni
L43 1,6562 0,38 ÷ 0,43 0,60 ÷ 0,85 0,15 ÷ 0,35 0,035 0,040 0,70 ÷ 0,90 0,20 ÷ 0,30 1,65 ÷ 2,00

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

MECHANICAL CHARACTERISTICS

STEEL NORMALISATION TEMPERATURE 900°C MIN – TEMPERING TEMPERATURE 620°C MIN
SYMBOLIC NUMERIC Re min Rm min  A min Z min Impact test -101°C
N/mm2 % % J
L43 1,6562 725 860 16 50 27 min

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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Steels

Our steel always comes from the same European steelworks, which guarantee a continuity for what concerns quality. The constant quality of the supplies allows to have repetitive parameters in mechanical processing and a greater control over deformations during heat treatment.

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Machining

Precise cuttings of small and big series are guaranteed by the employement of latest generation automatic saws that were projected and realized in order to guarantee precision standards required by customers, reducing processing wastage.

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Quality

The certification and introduction of the Quality System management allowed M.T.Acciai to improve not only its efficiency, but also the quality that is offered, in order to better meet our customers’ needs.

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