8620H carburizing steel tube by cold drawn and cold rolled process for anti-friction bearing

Products Description:

8620H properties is a carburing alloy steel specification as ASTM A534

Other Related Specifications ASTM A295/A295M DIN EN 10083/3 JIS G4053 DIN17210

Chemical compostion

Carbon C: 0.17-0.23 (allowable deviation: ± 0.02)
Silicon Si: 0.15 ～ 0.35 (allowable deviation: ± 0.03)

Mn: 0.60-0.95 (allowable deviation: ± 0.04)
Sulfur s: ≤ 0.015 (allowable deviation: ± 0.005)
P ≤ 0.025 (allowable deviation: ± 0.005)
Cr: 0.35-0.65 (allowable deviation: ± 0.15)
Ni: 0.35-0.75 (allowable deviation: ± 0.05)

Copper Cu: ≤ 0.30 (allowable deviation: ± 0.05)
Mo: 0.15-0.25 (allowable deviation: ± 0.02)
 

Mechanical properties:
Tensile strength σ B (MPA): ≥ 1176 (120)

Elongation δ 5 (%): ≥ 9
Reduction of area ψ (%): ≥ 45
Impact toughness value α kV (J / cm2): ≥ 78 (8)
Sample size: 15mm
● heat treatment specification and metallographic structure:

Heat treatment specification: quenching, the first 880 ± 20 ℃, the second 790 ± 20 ℃, oil cooling; tempering, 150-200 ℃, air cooling.
Metallographic structure: martensite.
Delivery status: hot rolled or forged steel shall be delivered in hot-rolled (forged) or annealed state. Cold drawn steel

is delivered in annealed condition.

Delivery Condition: +C, +LC, +SR, +A, +N

Production Size Range:

OD: 10-210mm
WT: 2-30mm
Length: 2-5.8m

Bearing and Gearing Steel Tube Characteristic:
High strength
High-precision
Good Surface Quality
Stable quality
Smooth Roughness

Production Processs:

Seamless Cold Drawn or Seamless Cold Rolled + Heat Treatment or Stress released control