709M40 Alloy Steel Round Bars

709M40 alloy steel round bars is also known as EN19 steel, exhibit a composition of 0.35%-0.45% Carbon, 0.50%-0.80% Manganese, 0.90%-1.50% Chromium, and 0.20%-0.40% Molybdenum, 

709M40 alloy steel round bars are highly regarded for their exceptional strength, toughness, and wear resistance, making them suitable for a variety of demanding applications. Here are the details:

Chemical Composition:

Mechanical Properties:

• Tensile Strength: Typically 850 - 1000 MPa
• Yield Strength (0.2% offset): Typically 680 - 850 MPa
• Elongation at Break: Typically 15 - 20%
• Hardness (Brinell): Typically 248 - 302 HB

Heat Treatment:

• Annealing: 680°C - 700°C, furnace cooling
• Normalizing: 850°C - 880°C, air cooling
• Hardening: 830°C - 870°C, oil or water quenching
• Tempering: 540°C - 680°C, air cooling

Applications:

• Gears
• Shafts
• Crankshafts
• Connecting rods
• Axles
• Fasteners
• Automotive components

709M40 alloy steel round bars are widely used in industries such as automotive, machinery, and aerospace due to their excellent mechanical properties.