Al-alloyed nitriding steel grade for large-sections.

Application
Structural parts with high surface hardness - piston rods, extruders, cylinders, shafts, straightening tools, measuring tools, etc.

 

Related Products

 

Related specifications:

   Germany       W.Nr. 1.8509

                          DIN 41CrAlMo7

Great Britain   EN 41B

                         B.S. 905M39                    

France            AFNOR 40CAD6,12       

Italy                 UNI 41CrAlMo7

Belgium         NBN 41CrAlMo7

Sweden         SS 2940

Spain             UNE 41CrAlMo7             

  

Process: EAF/LD+LF+VOD+ hot Forged/hot rolled+Heat Treatment(optional)  

 

SIZE RANGE:

 

Round:  Dia 10mm - 1200mm 

 

 

SURFACE FINISHES:
Black, grinded, turned

 

Ultrasonic test: According to SEP 1921-84

 

Soft Annealing
Heat to 650-700oC, cool slowly. This will produce a maximum Brinell hardness of 248.

Hardening
Harden from a temperature of 870-930oC followed by oil/polymer or water quenching.

Tempering
Tempering temperature: 580-700oC.

 

Forging
Hot forming temperature: 1050-850oC.

 

Chemical Composition:

Grade	C	Mn	P	S	Si	Cr	Mo	Al
41CrAlMo7	0.38- 0.45	0.40- 0.70	0.025  max	0.035 max	0.40  max	1.50- 1.80	0.20- 0.35	0.80- 1.20

 Mechanical properties of grade   41CrAlMo7 (1.8509)

 

Nominal thickness (mm):	16 - 40	40 - 100	100 - 160	160 - 250
Rm - Tensile strength (MPa) (+QT)	950-1150	900-1100	850-1050	800-1000

 

Nominal thickness(mm):	16 - 40	40 - 100	100 - 160	160 - 250
Rp0.2 0.2% proof strength (MPa) (+QT)	750	720	670	625