17CrNiMo7-6 alloy steel bar with Q+T/Black/Peeled surface

17CrNiMo7-6 alloy steel bar with Q+T/Black/Peeled  surface 

APPLICATIONS:

Heavy-duty arbors, bushings, wear pins,bearings, sprockets, gears and shafts etc.

Or can be used for high tensile applications uncarburised but through hardened and tempered. Severely stressed components for mechanical engineering and automobile industry

RELATED SPECIFICATIONS:       

Germany     W.Nr. 1.6587

Great Britain  EN 17CrNiMo7

                         EN 10084 DIN 18CrNiMo7-6

                         EN355, 822A17, 822H17, 817M17

USA         AISI 4820

ISO         683-11 18CrNiMo7

683-17 18CrNiMo7-6

Chemical Composition (%): 

Carbon       0.14-0.19 

Silicon        0.15-0.40 

Manganese    0.40-0.60

Phosphorus    0.035max 

Sulphur       0.035 max 

Nickel       1.40-1.70

Chromium    1.50-1.80

Molybdenum  0.25-0.35

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

SIZE RANGE: 

Round: 100mm-800mm  

SURFACE FINISHES: 

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

Test: Ultrasonic test according to SEP 1921-84

Soft Annealing
Heat to 650-700oC, cool slowly in furnace. This will produce a maximum Brinell hardness of 229.

Intermediate Annealing: 630-650oC.

Hardening
Carburising: 880-980oC.
Core Hardening: 830-870oC, water.
Case Hardening: 780-820oC, water.

Normalizing
Normalizing: 850-880oC, air.

Tempering
Tempering temperature: 150-200oC.

Soft annealed treated: max. 229 HB.
Treated for cold shearability: max. 255 HB.
Treated for strength: max. 229 HB.
Treated for ferite and pearlite structure and hardness range: 159-207 HB.

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.