• Uncompromising quality

  • Uncompromising quality

  • Uncompromising quality

  • Uncompromising quality

  • Uncompromising quality

  • Uncompromising quality

17NiCrMoS6-4 (UNI EN 10084)

 

PROPERTIES AND EMPLOYEMENTS
Il 17NiCrMo6-4 (UNI EN 10084) IS THE NEW DESIGNATION OF 18NiCrMo5 (UNI 7846). IT IS THE MOST COMMON CASE-HARDENING STEEL AND IN ITALY IT IS USED FOR ITS EXCELLENT CHARACTERISTICS THAT MAKE IT SUITABLE FOR SEVERAL APPLICATIONS. IT HAS A MEDIUM-HIGH HARDENABILITY AND A GOOD MACHINABILITY.
AFTER CASE-HARDENING AND HARDENING TREATMENTS, THE SURFACE REACHES AN ELEVATED HARDNESS.
17NiCrMo6-4 IS USED FOR THE PRODUCTION OF MECHANICAL PARTS, WHICH ARE SUBMITTED TO WEAR (GEARS, CAMSHAFTS, BUSHINGS, PINIONS).IS USED FOR THE PRODUCTION OF MECHANICAL PARTS, WHICH ARE SUBMITTED TO WEAR (GEARS, CAMSHAFTS, BUSHINGS, PINIONS).

 

CORRESPONDENCE TO INTERNATIONAL DESIGNATIONS

QUALITY EUROPE GERMANY FRANCE SPAIN G.B. USA
EN DIN W.n. AFNOR UNE B.S. AISI/SAE
17NiCrMoS6-4 17NiCrMoS6-4   1.6566 18NCD6   817M17 4317

CHEMICAL COMPOSITION % (EN 10084)

STEEL DESIGNATION CHEMICAL COMPOSITION
SYMBOLIC NUMERIC C Si
max		 Mn P
max		 S Cr Mo Ni B
17NiCrMo6-4 1,6566 0,14 ÷ 0,20 0,40 0,60 ÷ 0,90 0,025 ≤ 0,035 0,80 ÷ 1,10 0,15 ÷ 0,25 1,20 ÷ 1,50 -
17NiCrMoS6-4 1,6569 0,020 ÷ 0,040

CONCENTRATION LIMITS OF THE ELEMENTS THAT ARE NOT INDICATED IN THE TABLE CAN BE DEDUCED IN THE EN 10020 REGULATION. IT CAN BE PROVIDED WITH AN ADDITION OF LEAD 0,12-0,35% OR SULPHUR CONTROLLED UP UNTIL 0,40% FOR AN IMPROVED MACHINABILITY.

MECHANICAL CHARACTERISTICS (UNI 7846)

STEEL QUALITY BAR'S DIAMETER TENSILE TESTING IMPACT STRENGTH
KCU min
UNIFIED TENSILE STRENGTH
R		 DEVIATION FROM PROPORTIONALITY
Rp 0,2 min		 ELONGATION
A min
mm N/mm2 kgf/mm2 N/mm2 kgf/mm2 % J
18NiCrMo5 11
(30)
(63)		 1230÷1520
(980÷1270)
(830÷1130)		 125÷155
(100÷130)
(85÷115)		 980
(735)
(635)		 100
(75)
(65)		 8
(9)
(10)		 30
(32,5)
(35)

JOMINY HARDENABILITY (EN 10084)

STEEL DESIGNATION RANGE LIMITS HRC HARDNESS MEASURED FROM THE QUENCHED END OF THE TEST TUBE (MM)
SYMBOLIC NUMERIC 1,5 3 5 7 9 11 13 15 20 25 30 35 40
17NiCrMo6-4+H 1.6566+H max 47 47 46 45 43 42 41 39 37 35 34 34 33
17NiCrMoS6-4+H 1.6569+H min 39 38 36 35 32 30 28 26 24 22 21 20 20
17NiCrMo6-4+HH 1.6566+HH max 47 47 46 45 43 42 41 39 37 35 34 34 33
17NiCrMoS6-4+HH 1.6569+HH min 42 41 39 38 36 34 32 30 28 26 25 25 24
17NiCrMo6-4+HL 1.6566+HL max 44 44 43 42 39 38 37 35 33 31 30 29 29
17NiCrMoS6-4+HL 1.6569+HL min 39 38 36 35 32 30 28 26 24 22 21 20 20

USUALLY AVAILABLE EX STOCK

M.T. COLORATION QUALITY HEAT TREATMENT SURFACE DIAMETER (mm)
17NiCrMo6-4 Soft-annealed rolled
forged turned
drawn / peeled h111		 20-300
330-1200
20-80
17NiCrMo6-4
high machinability		 Soft-annealed rolled
peeled		 30-220
22-80
17NiCrMo6-4+PB Soft-annealed rolled
drawn / peeled h111		 20-200
5-100

 

 
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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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