NEW-ERA STEEL TUBE TECHNOLOGY CO.,LTD
NEW-ERA STEEL TUBE HOLDING NINGBO PIPEWAY TRADE CO.,LTD
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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
