4317  (17CrNiMo6)

Description:

8CrNiMo7- 6 Chrome-Nickel-Moly Carburising Steel generally supplied annealed to HB 229max. Carburised and heat treated it develops a hard wear resistant case to HRC 60-63 and a tough strong core with a typical tensile strength range of 900-1300 MPa, in small to fairly large sections.

APPLICATIONS:

Heavy-duty arbors, bushings, Cam Followers, wear pins, bearings, sprockets, gears and shafts, Clutch Dogs, Compressor Bolts, Extractors, Fan Shafts, Heavy Duty Gears, Pump Shafts, Sprockets, Tappets, Wear Pins, Wire Guides etc..  Or can be used for high tensile applications uncarburised but through hardened and tempered. It is used extensively by all industry sectors for components and shafts requiring high surface wear resistance, high core strength and impact properties.

Related specifications:

Australia :   AS 1444-1996 X4317 or X4317H

Germany:   EN10084-1998 1.6587 18CrNiMo7-6 or

           1.6587H 18CrNiMo7-6H

           Werkstoff 1.6587 18CrNiMo7-6 or 17CrNiMo6

             DIN 17210 17CrNiMo6

Great Britain   BS970: PART 3: 1991 820M17/822M17

            BS970: 1955 - EN354/EN355

U.S.A.        SAE 4317

            AISI 4317

Chemical Composition (%):

Carbon       0.15-0.20

Silicon       0.4 max

Manganese    0.40-0.60

Phosphorus    0.04 max

Sulphur       0.04 max

Chromium     1.50-1.80

Molybdenum   0.25-0.35

Nickel: 1.40-1.70

COLOUR CODE: Red and White (Bar end)

Process:  EAF+LF+VOD+Forged or Rolled+Heat Treatment(optional)

SIZE RANGE:

Round:

Hot Rolled:  8mm-500mm

Hot Forged:  80mm-1200mm

Flat:

Hot rolled: Thickness: 20-130mm  Width: less than 610mm

Hot forged: Thickness: 150-600mm Width: up to 1600mm

SURFACE FINISHES:

Black, Peeled (K12), Cold Drawn, Turned & Polished (H10, H11), Precision Ground (H9, H8)

Heat Treatment:
 Hot working: 850-1150oC
 Case hardening: Double hardeningoC
 Carburising: 900-950oC
Soft annealing: 650-700oC
Surface hardening: 800-930oC
Tempering: 150-210oC

Ultrasonic test:  According to SEP 1921-84 3C/c

Certificate of Quality: issued in English, in addition the normal terms, production process, the mechanical property (yield strength, tensile strength, elongation and hardness), forged ratio, UT test result, Grain size, heat treatment methods and the sample of is shown on the Certificate of Quality.

Marking: Heat No. will be cold stamped and Steel grade, diameter (mm), length (mm), and  the manufacturer LOGO and weight (kg) is painted

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