30CrNiMo8, 1.6580, 30NCD8 QT alloy special steel


30CrNiMo8, 1.6580, 30NCD8 - alloyed structural steel for Q&T(quenching and tempering) acc. to EN 10083-3, EN 10269, EN 10250-3, EN 10297-1

30CrNiMo8, 1.6580, 30NCD8 QT alloy special steel - Introduction and Application

Alloy structural steel with hardenability, with high elasticity and high strength properties, mostly used for heavy components, reaching over 1560 N/mm2 in small diameters. After softening, the hardness reaches its maximum value. 248 HRB. Another feature of it is its resistance to variable loads and shocks. This material is not suitable for welding and will eventually require additional preheating. Grade 30CrNiMo8 is used in the production of heavy duty parts, shafts and drive shafts, steering shafts, engine crankshafts, screws and components exposed to temperature in the power industry.


30CrNiMo8, 1.6580, 30NCD8 QT alloy special steel - Chemical composition WT %

GradeChemical composition WT %
C:Mn:Si:P:S:Cr:Ni:Mo:Cu:
EN 30CrNiMo8, 1.65800.26 - 0.340.3 - 0.6Max 0.4Max 0.025Max 0.0351.8 - 2.21.8 - 2.20.3 - 0.5-
JIS SNCM4310.26 - 0.340.3 - 0.60.17 - 0.37Max 0.035Max 0.0351.8 - 2.11.8 - 2.10.25 - 0.35Max 0.2
AFNOR 30CND8, 30NCD80.26 - 0.330.3 - 0.60.1 - 0.4Max 0.030Max 0.0251.8 - 2.21.8 - 2.20.3 - 0.5-
DIN 31CrNiMo80.27 - 0.340.3 - 0.60.1 - 0.4Max 0.035Max 0.0351.8 - 2.21.8 - 2.20.3 - 0.5-

Mechanical Property of 30CrNiMo8, 1.6580, 30NCD8 QT alloy special steel

  • Dimensions <16mm 
    • Tensile strength, R2
    • Yield strength, R2
    • Elongation, A: Min 9%
    • Necking, Z: Min 40%
  • Dimensions 16-40mm 
    • Tensile strength, R2
    • Yield strength, R2
    • Elongation, A: Min 9%
    • Necking, Z: Min 40%
  • Dimensions 40-100mm 
    • Tensile strength, R2
    • Yield strength, R2
    • Elongation, A: Min 10%
    • Necking, Z: Min 45%
    • Impact strength, KV: Min 35 J
  • Dimensions 100-160mm 
    • Tensile strength, R2
    • Yield strength, R2
    • Elongation, A: Min 11%
    • Necking, Z: Min 50%
    • Impact strength, KV: Min 45J
  • Dimensions 160-330mm: 
    • Tensile strength, R2
    • Yield strength, R2
    • Elongation, A: Min 12%
    • Impact strength, KV: Min 45 J
  • Dimensions Min 330mm 
    • Tensile strength, R2
    • Yield strength, R2
    • Elongation, A: Min 12%
    • Impact strength, KV: Min 40 J


Heat Treatment of 30CrNiMo8, 1.6580, 30NCD8 QT alloy special steel

Softening annealing at a temperature of 640 - 680℃ 

Normalizing annealing at a temperature of 840 - 860℃ 

Hardening with cooling in oil at 815 - 845℃ 

Tempering with cooling in air at 550 - 650℃



Equivalent grades of 30CrNiMo8, 1.6580, 30NCD8 QT alloy special steel

3KH3M3F, 30Cr2Ni2Mo, 823M30, 30ChN2MA, 30HN2MA, 30ХН2МА, 30NCD8, 30CND8, 31CrNiMo8, NCMo6 Z, 31CrNiMo8H, 31CrNiMo8HH, 31CrNiMo8HL, SNCM431, 30MoCrNi20, C5432.

30CrNiMo8, 1.6580, 30NCD8 QT alloy special steel Alloy Structural Steels stock list

Grade Shape Dimensionmm Qty.kg
30CrNiMo8 Round bar φ115 6900
30CrNiMo8 Round bar φ120 50107
30CrNiMo8 Round bar Φ135 16120
30CrNiMo8 Round bar Φ150 3585
30CrNiMo8 Round bar Φ180 16695
30CrNiMo8 Round bar Φ220 6075
30CrNiMo8 Ingot 860