AISI 4340 • JIS SNCM439 • DIN 1.6563 Steel Round Bar and Sheet On Stock

AISI 4340 steel is high hardenability steel. Its hardenability is the best in the stand of AISI. It has high strength, toughness. In the over high temperature, its stability also at a good level.

The stand grade of it in different countries:

• GB: 40CrNiMoA
• DIN: 36CrNiMo4
• NF: 40NCD3
• JIS: SNCM439
• BS: 816M40
• AISI/ASTM4340

4340 Steel Chemical Composition:

• Carbon: 0.38%-0.43%
• Silicon: 0.15%-0.35%
• Manganese: 0.60%-0.80%
• Sulfur: ≤0.040%
• Phosphorus: ≤0.035%
• Chromium: 0.70%-0.90%
• Nickel: 1.65%-2.00%
• Molybdenum: 0.20%-0.30%

4340 Steel Properties:

Tensile strength: ≥100MPa
Yield strength: ≥85MPa

4340 Steel Application:

It is good material for the axle of the big machine with high requirement of high strength and toughness. And it will be a good material for high stand fittings after the low-temperature tempering or quenching.

As a professional 4340 steel supplier in China, we always waiting for you.