4340 Round Steel Bars,
Steel Grade: Alloy Steel 40CrNiMo/1.6563,
Specification:
Diameter (mm) Length (mm)
Round bars: 12~3000 4000~6000 Hot rolled
280~1000 3000~5800 Forged
Thickness(mm) Width(mm) Length (mm)
Flat bars/Blocks 20~600 50~1000 1000~5800
Delivery condition:
1. EAF+LF+VD, rolled /forged, UT pass
2. Surface: Black surface, turned surface and milling surface according to customer's requirements.
3. Heat treatment such as normalizing or annealing or Q/T can be done according to customer's technical specifications.

4340 Round Steel Bars, Grade: Alloy Steel 40CrNiMo/4340/SCM439/4CrMo4/1.6563 Chemical Composition C Si Mn Cr Mo P S Cu Ni 0.37-0.44 0.17-0.37 0.50-0.80 0.60-0.90 0.15-0.25 ≤0.025 ≤0.025 ≤0.30 ≤0.30 Mechanical Properties
Tensile Strength Rm,MPa	Yield Strength Rel,MPa	Elongation A,%	Reduction Z,%	I mpacting Energy Aku,J	HBW ≤ After Annealing
≥980	≥835	≥12	≥55	≥78	269