Model Number: hot rolled round bar -12 Key Specifications/Special Features: 1.Description:.Nickel, Chromium, Molybdenum steel for applications requiring high tensile strength and toughness values, particularly in large cross sections in the quenched and tempered condition. The addition of Molybdenum prevents the steel from being susceptible to temper brittleness. Higher tensile and yield strength than 4140.2.Applications:Components for the aircraft, automotive and general engineering industries eg. Propeller shafts, connecting rods, gear shafts, and other automobile parts. Heavy forgings, eg. Rotors, shafts, discs.3.Related Specifications: W.Nr. 1.6582 1.6562/DIN GS-34CrNiMo6V/34CrNiMo6/40NiCrMo8-4/EN BS 970 817M40 816M40
4.Chemical Composition (%):

Carbon 0.30 - 0.38

Silicon 0.40 max

Manganese 0.50 - 0.80

Phosphorus 0.025max

Sulphur 0.035 max

Chromium 1.30 - 1.70

Nickel 1.30-1.70

Molybdenum 0.15 - 0.30

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

6.Specification: Dia:10-320mm. Length : as your request

7.SURFACE FINISHES:
Black, Peeled(K12), Cold Drawn, Turned & Polished(H10, H11), Precision Ground(H9, H8)

8.Test: Ultrasonic test according to SEP 1921-84

9.Forge 850-1050oC, slow furnace cool.
Normalize 850-880, air cool.
Anneal 650-700, Cool slowly in controlled furnace

10.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.

11.Marking: Heat No. will be cold stamped and Steel grade, diameter mm, length mm, and the