30CrNiMo8 | DIN 1.6580 2018-12-20T14:03:13+00:00

Project Description

30CrNiMo8|DIN 1.6580 is a heat treatable steel  which has at least 1.8%Cr,1.8%Ni,and 0.3%M0 as strengthening alloy elements.It is usually supplied with quenched and tempered condition with a typical tensile strength of 1100 -1300 N/mm². 30CrNiMo8 steel is used for automotive and general components which requires high demands on strength and toughness and good hardenability.It is especially suitable for heavy duty parts in the aviation, automotive and military industries.

30CrNiMo8 steel

1.Supply Form & Size & Tolerance

Hot rolled bar:Φ6-Φ130mm,Length:3000-10000mm

Hot Forged round bar:Φ130-Φ1000mm,Length:3000-10000mm

Flat bar/Blcoks:Thickness :120-800mm xWidth:120-1500mm,Length:2000-6000mm

Surface FinishTolerance
Black For Forged condition(0,+5mm)
Black For Rolled condition(0,+1mm)
Rough Turned   (0,+3mm)
GrindingBest h9
PolishedBest h11
PeeledBest H11
Cold DrawnBest H11

2.Chemical Composition

GradeCMnPSSiNiCrMo
30CrNiMo8/1.65800.26-0.340.50-0.80≤ 0.025≤ 0.035≤ 0.041.8-2.21.8-2.20.3-0.5

3.Relevant Standards

USAUKFranceItaly
A320L43823M3030NCD830CrNiMo8

4. Mechanical Property

Diameter d mm≤ 1616-4040-100100-160160-250
Yield Strength Mpa≥900≥800≥700≥600≥550
Tensile Strength Mpa1100-13001000-1200900-1100800-950750-900
Elongation, %≥10≥11≥12≥13≥14
Reduction of area ,%≥45≥50≥55≥60≥60
impact,J≥35≥40≥45≥45≥45
Hardness,HB331-380298-359271-331240-286225-271

5.Forging

Heat the temperature between 1050℃-1150℃,hold suitable time for the steel to be thoroughly heated.Reheat the steel once temperature  below 850°C. 30CrNiMo8 steel has good forging characteristics,but crack is easily occured when improper cooling way after forged,so it  should be cooled as slowly as possible in the furnace or in sand after forged.

6.Heat Treatment

  • Normalizing:870℃-880℃,Cool in air
  • Soft Annealing:650℃-700℃,Cooling 10℃ per hour  in furnace,max. 248 HB
  • Stress Relieving:50°C under the temperature of tempering
  • Hardening:830 – 860°C,oil or polymer,840-850°C,water
  • Tempering:540°C – 660°C, cool in still air

7.Jominy Test-Hardenability

HRC-mmType1.5367911131520253035404550
MIN
+H
484848484747474646454544444343
MAX565656565555555555545454545454
MIN
+HH
515151515050504949484847474747
MAX565656565555555555545454545454
MIN
+HL
484848484747474646454544444343
MAX535353535252525252515151515050
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