Alloy steel round bar, 30CrNiMo8

Model Number: hot forged steel bar -22 Brand Name: Unite Steel Key Specifications/Special Features: DescriptionsVCNMO200 is a heat treatable, low alloy steel containing nickel, chromium and molybdenum. It is known for its toughness and capability of developing high strength in the heat treated condition while retaining good fatigue strength.ApplicationsFor permanently stressed components with large cross sections for automotive and mechanical engineering. For economic performance under severe dynamic stress, parts must be designed for optimum strength or toughness.

Related specifications:

Germany: DIN 30CrNiMo8 Wr.N 1.6580

Great Britain: EN 10269 30CrNiMo8, BS 823M30

USA: AISI/SAE 4340

France: AFNOR 30NCD8

ISO 31CrNiMo8



Chemical composition (%):

Carbon: 0.26-0.34

Silicon: 0.40 max

Manganese: 0.50-0.80

Phosphorus: 0.025max

Sulphur: 0.035 max

Chromium: 1.80-2.20

Nickel: 1.80-2.20

Molybdenum: 0.30-0.50

Process: EAF + LF + VD + Forged + Heat Treatment(optional)


Size range:

Round:

Hot Forged: 80mm-1500mm

Flat:

Hot forged: Thickness:150-600mm Width: up to 1600mm


Surface finishes:

Black, peeled, cold drawn, turned & polished, precision ground

Test: Ultrasonic test according to SEP 1921-84

Normalizing
Temperature: 850-880 oC.

Hardening
Harden from a temperature of 830-880oC followed by oil quenching.

Tempering
Tempering temperature: 540-680oC.