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: 10mm-350mm

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.

 We, Shanghai Unite Steel are committed to integrate engineering steel resources in china and serve the global engineering steel market. Our company has more than 15 years of experience in steel researching, production, managing and sales. And our team mostly are based on and worked in national famous steel enterprise.

In the aspect of resources and information, we have established cooperative and stronger relationship with nearly hundred enterprises, either state-owned or private owned in china, such as: DAYE Special Steel-a famous steel enterprise with the longest steelmaking history; BAO Steel, and Dongbei Special Steel Group-the biggest special steel manufacturer; TPCO, VALIN-largest seamless steel tube production enterprise; What's more, we have built long, deep and close business relationship with dozens of steel companies, Sharing and holding equities with several steel enterprises. Because of the close cooperation with steel companies and our pioneering spirit, which can ensure us stay at the top competition, and ensure our customers get what they really want!