34CrNi3Mo vs 42CrMo: Comparing Steel Difference | MachineMFG

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34CrNi3Mo vs 42CrMo: Comparing Steel Difference

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34CrNi3Mo is a high-strength alloy structural steel with good comprehensive mechanical performance and processability.

It is governed by the standard: JB/T6396-2006.

42CrMo steel is an ultra-high-strength steel, with high strength and toughness, good hardenability, no obvious temper brittleness, high fatigue limit and multiple impact resistance after quenching and tempering, and good low temperature impact toughness.

It is governed by the standard GB/T 3077-1999.

Comparison of Chemical Composition

34CrNi3Mo42CrMo
C:0.30-0.40%C:0.38-0.45%
S:0.17-0.37%Si:0.17-0.37%
Mn:0.50-0.80%Mn:0.50-0.80%
S:≤0.035%S:≤0.035%
P:≤0.035%P:≤0.035%
Cr:0.70-1.10%Cr:0.90-1.20%
N:2.75-3.25%Ni:≤0.030%
Cu:≤0.020%Cu:≤0.030%
M0:0.25-0.40%Mo:0.15-0.25%

Comparison of Mechanical Properties

After quenching and tempering according to the JB/T6396-2006 standard, the properties of 34CrNi3Mo are as follows:

  • Tensile strength ≥900
  • Yield strength ≥785
  • Elongation ≥14%
  • Shrinkage after fracture ≥40%
  • Impact work ≥54J.

After quenching and tempering according to the GB/T 3077-1999 standard, the properties of 42CrMo are as follows:

  • Tensile strength ≥1080
  • Yield strength ≥930
  • Elongation ≥12%
  • Shrinkage after fracture ≥45%
  • Impact work ≥63J.

From the above comparison, it can be seen that 34CrNi3Mo and 42CrMo are largely similar in chemical composition, with only the Ni element making a significant difference. As the value of the Ni element is relatively high, the production cost of the raw materials for 34CrNi3Mo is higher than that for 42CrMo.

Both materials show good hardenability, similar plasticity and toughness. In practical applications, if both the mechanical properties (tensile strength ≥900, yield strength ≥785, elongation ≥14%, shrinkage after fracture ≥40%, impact work ≥54J) are to be met and cost is to be controlled, materials of 42CrMo grade can also meet the requirements.

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