Uncompromising quality

They are quenched and tempered steels with a chemical composition that has an addition of aluminium, chromium, molybdenum, vanadium. In contact with nitrogen they form hard nitrides.

They have an excellent wear resistance and abrasion resistance, combined with an improvement in corrosion resistance in aggressive environments. For all these characteristics they are preferred over case-hardening steels, but also for the low number of deformations that come from the nitriding treatment.

HARDENABLITY

Jominy hardenability demonstrates that they are steels with an excellent hardenability, some are tougher, for example 34CRALMO7, whereas 41CRALMO7 has an excellent superficial hardness.

For what concerns reliability and functionality, you can obtain a hardened superficial layer that can vary from 0,05 yo 1 mm, considering an increase in the fragility related to the nitriding thickness.

Hardness that you obtain from the nitriding heat treatment is more elevated than the one you obtain from case-hardening steels and hardened steels.

Nitriding steels (EN 10085)

They are quenched and tempered steels with a chemical composition that has an addition of aluminium, chromium, molybdenum, vanadium. In contact with nitrogen they form hard nitrides.

They have an excellent wear resistance and abrasion resistance, combined with an improvement in corrosion resistance in aggressive environments. For all these characteristics they are preferred over case-hardening steels, but also for the low number of deformations that come from the nitriding treatment.

HARDENABLITY

Jominy hardenability demonstrates that they are steels with an excellent hardenability, some are tougher, for example 34CRALMO7, whereas 41CRALMO7 has an excellent superficial hardness.

For what concerns reliability and functionality, you can obtain a hardened superficial layer that can vary from 0,05 yo 1 mm, considering an increase in the fragility related to the nitriding thickness.

Hardness that you obtain from the nitriding heat treatment is more elevated than the one you obtain from case-hardening steels and hardened steels.

34CrAlNi7 (1.8550)

EN 10085

Quenced Tempered (+QT) / Stabilized (+SR)

PROPERTIES AND EMPLOYEMENTS

THIS STEEL HAS AN ELEVATED HARDENABILITY, DISCREET TOUGHNESS AND IT IS SUITABLE FOR THE CONSTRUCTION OF BIG PARTS THAT ARE SUBMITTED TO ELEVATED DYNAMIC STRESSES. IT HAS THE BEST MACHINABILITY AMONG NITRIDING STEELS THAT CONTAIN ALUMINIUM. FOR THIS REASON IT IS PREFERRED OVER OTHER NITRIDING STEELS, BECAUSE AN ESSENTIAL CHARACTERISTIC IS THE TOUGHNESS OF NITRITED LAYERS AT ELEVATED HARDNESS (GUARANTEED BY ALUMINIUM)
16NiCrMo12

 

 

CORRESPONDENCE TO INTERNATIONAL DESIGNATIONS

QUALITYEUROPEGERMANYFRANCESPAING.B.USA
ENDINW.n.AFNORUNEB.S.AISI/SAE
34CrAlNi7 34CrAlNi7-10 34CrAlNi7 1.8550       K52440

CHEMICAL COMPOSITION % (EN 10085)

STEEL DESIGNATIONCHEMICAL COMPOSITION
SYMBOLICNUMERICCSi
max		MnP
max		Sb
max		AlCrMoNiV
34CrAlNi7-10 1.8550 0,30 ÷ 0,37 0,40 0,40 ÷ 0,70 0,025 0,035 0,80 ÷ 1,20 1,50 ÷ 1,80 0,15 ÷ 0,25 0,85 ÷ 1,15 -

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

MECHANICAL CHARACTERISTICS (EN 10085)

STEEL 16mm < d ≤ 40mm 40mm < d ≤ 100mm 100mm < d ≤ 160mm 160mm < d ≤ 250mm HV1b
SYMBOLIC NUMERIC Re min Rm A min KV min Re min Rm A min KV min Re min Rm A min KV min Re min Rm A min KV min
N/mm2 % J N/mm2 % J N/mm2 % J N/mm2 % J
34CrAlNi7-10 1.8550 680 900 to
1100		 10 30 650 850 to
1050		 12 30 600 800 to
1000		 13 35 600 800 to
1000		 13 35 950

JOMINY HARDENABILITY (EN 10085)

STEEL DESIGNATIONRANGE LIMITSHRC HARDNESS MEASURED FROM THE QUENCHED END OF THE TEST TUBE (MM)
SYMBOLICNUMERIC1,535791113152025303540
34CrAlNi7-10 1.8550 max 60 59 58 57 56,5 56 55,5 55 53,5 52,5 51 49 47,5
min 49 48 47 46,5 45,5 44 43,5 42 39 37 35 34 33

USUALLY AVAILABLE on STOCK

M.T. COLORATIONQUALITYHEAT TREATMENTSURFACEDIAMETER (mm)
34CrAlNi7 Quenched and tempered, stress relieved rolled peeled 50-320

 

 
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41CrAlMo7-10 (1.8509)

EN 10085

Hardening Tempering Stabilized (+QT +SR)

 

PROPERTIES AND EMPLOYEMENTS

41CrAlMo7-10 HAS AN ELEVATED HARDENABILITY AND A HIGH CARBON CONTENT THAT MAKE IT SUITABLE FOR THE CONSTRUCTION OF BIG PARTS, WHICH ARE SUBMITTED TO ELEVATED PULSING AND DYNAMIC STRESSES. ALUMINIUM CONFERS IT AN ELEVATED HARDNESS AT THE NITRITED STATE, EVEN IF IT REDUCES THE STEEL'S TOUGHNESS. THIS STEEL HAS A MORE DIFFICULT MACHINABILITY THAT CAN BE IMPROVED BY TAKING CARE OF THE INCLUSIVE RATE AND THE MICRO-STRUCTURE OF STEEL.
41CrAlMo7-10 (1.8509)

 

 

CORRESPONDENCE TO INTERNATIONAL DESIGNATIONS

QUALITYEUROPEGERMANYFRANCESPAING.B.USA
ENDINW.n.AFNORUNEB.S.AISI/SAE
41CrAlMo7-10 (LK3) 41CrAlMo7 41CrAlMo7 1.8509 40CAD6.12 F1740 905M39  

CHEMICAL COMPOSITION % (EN 10085)

STEEL DESIGNATIONCHEMICAL COMPOSITION
SYMBOLICNUMERICCSi
max		MnP
max		Sb
max		AlCrMoNiV
41CrAlMo7-10 1.8509 0,38 ÷ 0,45 0,40 0,40 ÷ 0,70 0,025 0,035 0,80 ÷ 1,20 1,50 ÷ 1,80 0,20 ÷ 0,35 - -

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

MECHANICAL CHARACTERISTICS (EN 10085)

STEEL 16mm < d ≤ 40mm 40mm < d ≤ 100mm 100mm < d ≤ 160mm 160mm < d ≤ 250mm HV1b
SYMBOLIC NUMERIC Re min Rm A min KV min Re min Rm A min KV min Re min Rm A min KV min Re min Rm A min KV min
N/mm2 % J N/mm2 % J N/mm2 % J N/mm2 % J
41CrAlMo7-10 1,8509 750 950 to
1150		 11 25 720 900 to
1100		 13 25 670 850 to
1050		 14 30 625 800 to
1000		 15 30 950

JOMINY HARDENABILITY (EN 10085)

STEEL DESIGNATIONRANGE LIMITSHRC HARDNESS MEASURED FROM THE QUENCHED END OF THE TEST TUBE (MM)
SYMBOLICNUMERIC1,535791113152025303540
41CrAlMo7-10 1,8509 max 60 60 59,5 59,5 59 59 58,5 58 57 56,5 55 53 51
min 53 52 51 50 49 48 47,5 47 44,5 41 39,5 37,5 36

USUALLY AVAILABLE EX STOCK

M.T. COLORATIONQUALITYHEAT TREATMENTSURFACEDIAMETER(mm)
41CrAlMo7-10 Quenched and tempered (+QT)
Quenched and tempered stabilized  (+QT  +SR)		 rolled peeled
forged turned		 20-300
300-520

 

 
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