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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.

Cold drawn and Cold rolled bearing tubes tolerance control level

Outer Diameter

Diameter Tolerance

Outer Diameter

Diameter Tolerance

(mm)

(mm)

(mm)

(mm)

≤12.70

±0.08

>50.80～63.5

±0.25

12.7～25.40

±0.10

>63.50～76.20

±0.30

>25.4～38.10

±0.15

>76.20～101.60

±0.40

>38.1～50.80

±0.20

>101.60～203.20

±0.50

Remark:Tolrance on outer diameter and Inner diameter,wall thickness
can be specified by customer requested,

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

https://www.hjbearingtube.com/seamless-bearing-tubes/