34Cr4 alloy steel is mainly used in manufacture of mechanical parts under medium load and medium speed work after quenched and [TJC STEEL]tempered treatment.

 

34Cr4 Alloy Steel’s Standard: EN 10083/1991;

Chinese Equivalent Grade with 34Cr4 Alloy Steel: 35Cr;

Japanese Equivalent Grade with 34Cr4 Alloy Steel:SCr435;

American Equivalent Grade with 34Cr4 [TJC STEEL]Alloy Steel: 5135;

British Equivalent Grade with 34Cr4 Alloy Steel: 530A36;

French Equivalent Grade with 34Cr4 Alloy Steel: 38C4;

 

Chemical Composition for 34Cr4 Alloy Steel(%):

C: 0.30 ~ 0.37 Si: ≤0.40

Manganese: 0.60 ~ 0.90

Sulfur S: allowable residual content ≤0.035

Phosphorus P: allowable residual content ≤0.035

Chromium Cr: 0.90 ~ 1.20[TJC STEEL]

Nickel Ni: allowable residual content ≤0.25

Copper Cu: allowable residual content ≤0.030

 

Mechanical Properties of 34Cr4 Alloy Steel:

Tensile strength σ B (MPa) : ≥930(95)

Yield strength σs (MPa) : ≥735(75)

Elongation δ5 (%) : ≥11

Section shrinkage ψ (%) : ≥45

Impact power Akv (J) : ≥47

Impact[TJC STEEL] toughness value α kV (J/cm2) : ≥59(6)

Hardness: 207 hb or less

(Sample size: Sample blank size is 25mm)

 

34Cr4 Alloy Steel’s Heat treatment Specification and Metallographic Structure:

Heat treatment specification: quenched[TJC STEEL] at 860℃, oil cooled; Temper 500℃, water cooled, oil cooled.

Delivery condition: Heat treatment (normalizing, annealing or high temperature tempering) or no heat treatment, delivery condition[TJC STEEL] shall be indicated in the contract.