Cold Drawn 100Cr6 GCr15 Precision Seamless Alloy Steel Pipe Bearing Steel Tube
Product Details
GCr15 Hydraulic Steel Tubing
,OD 260mm Hydraulic Steel Tubing
,12m Steel Hydraulic Tubing
TORICH supplies 100Cr6 and GCr15 seamless alloy steel pipes manufactured from high-carbon chromium bearing steel. These tubes are designed for precision-machined bearing components requiring high hardness after heat treatment, good wear resistance, and controlled material cleanliness.
Available steel grades include GCr15, 100Cr6, 100CrMnSi6-4, 100CrMnSi6-6, and 100CrMo7. Manufacturing processes include seamless cold drawing, cold rolling, and heat treatment according to the specified grade and delivery condition.
| Product Name | 100Cr6 GCr15 Seamless Alloy Steel Pipe |
|---|---|
| Material | High-Carbon Chromium Bearing Steel |
| Steel Grades | GCr15, 100Cr6, 100CrMnSi6-4, 100CrMnSi6-6, 100CrMo7 |
| Main Standards | EN ISO 683-17, GB/T 18254, YB/T 4146 |
| Manufacturing Process | Seamless Cold Drawn, Cold Rolled, or Hot Rolled |
| Outside Diameter (OD) | 10–260 mm, subject to manufacturing feasibility |
| Wall Thickness (WT) | 2–30 mm, depending on manufacturing process |
| Length | 2–12 m; customized cut lengths available by agreement |
| Dimensional Tolerances | According to the agreed tube standard, accuracy class, or customer drawing |
| Straightness | ≤1.0 mm/m for WT ≤15 mm; ≤1.5 mm/m for WT >15 mm, according to YB/T 4146-2016 |
| Surface Condition | As-Drawn, Annealed, Peeled, or Polished |
| Heat Treatment | Spheroidizing Annealed (+AC); other delivery conditions by agreement |
| Inspection | Dimensional Inspection, Hardness Testing, Microstructure Examination, and Specified NDT |
Regular Size Examples: 29.4 × 5.6 mm, 36.9 × 7.73 mm, 62.9 × 7.3 mm.
Note: YB/T 4146-2016 specifies standard OD ranges of 12–159 mm for cold-drawn/rolled tubes and 48–194 mm for hot-rolled tubes. Other dimensions require agreement between the manufacturer and purchaser.
100Cr6 contains 0.93–1.05% carbon and 1.35–1.60% chromium. After appropriate quenching and tempering, this composition provides the high hardness and wear resistance required for rolling bearing components.
Under YB/T 4146-2016, tube out-of-roundness must not exceed 60% of the specified OD tolerance, while wall thickness nonuniformity must not exceed 80% of the specified wall thickness tolerance.
Spheroidizing annealing produces a carbide structure suitable for machining and subsequent hardening. According to EN ISO 683-17, the maximum hardness of 100Cr6 in the +AC condition is 207 HBW.
Non-metallic inclusions can initiate fatigue cracks in bearing components. TORICH supports material selection and inspection requirements covering inclusion ratings, metallurgical quality, and heat traceability. Acceptance criteria can be specified according to the applicable bearing steel standard.
Excessive hardness variation can affect cutting performance and tool life. For annealed GCr15 cold-finished tubes supplied to YB/T 4146-2016, the specified hardness range is 179–220 HBW, with a maximum difference of 15 HBW within one batch and 10 HBW within one tube cross-section.
Surface decarburization can reduce hardness after final heat treatment. YB/T 4146-2016 limits total decarburization depth on both internal and external surfaces to 0.20 mm for cold-drawn/rolled tubes and 0.50 mm for hot-rolled tubes.
Eddy current testing and, where required, ultrasonic testing can be incorporated into the inspection plan.
- EN ISO 683-17:2023: Chemical composition, hardness, and technical delivery requirements for ball and roller bearing steels, including 100Cr6 and related grades.
- GB/T 18254-2016: Material requirements for high-carbon chromium bearing steel, including GCr15.
- YB/T 4146-2016: Technical delivery conditions for high-carbon chromium seamless bearing steel tubes.
- ASTM A295/A295M: High-carbon anti-friction bearing steel, including the comparable 52100 grade.
- JIS G 4805:2025: High-carbon chromium bearing steel, including SUJ2.
- GOST 801-2022: Rolled bearing steel specifications, including the comparable ShKh15 grade.
Comparable international grades are not automatically interchangeable. Chemical composition, product form, heat treatment, and inspection requirements must be checked against the purchase specification.
100Cr6 and GCr15 seamless bearing steel tubes can be used to manufacture precision inner-ring blanks for deep-groove ball bearings.
The seamless tubular form allows ring blanks to be cut and machined before final hardening and grinding. Material cleanliness, carbide distribution, dimensional accuracy, and controlled decarburization are important to the finished ring's quality.
Chemical composition in mass fraction (%), based on GB/T 18254-2016 for GCr15 and EN ISO 683-17:2023 for the four European grades.
| Steel Grade | C | Si | Mn | P Max. | S Max. | Cr | Mo |
|---|---|---|---|---|---|---|---|
| GCr15 | 0.95–1.05 | 0.15–0.35 | 0.25–0.45 | 0.025 | 0.020 | 1.40–1.65 | ≤0.10 |
| 100Cr6 | 0.93–1.05 | 0.15–0.35 | 0.25–0.45 | 0.025 | 0.015 | 1.35–1.60 | ≤0.10 |
| 100CrMnSi6-4 | 0.93–1.05 | 0.45–0.75 | 1.00–1.20 | 0.025 | 0.015 | 1.40–1.65 | ≤0.10 |
| 100CrMnSi6-6 | 0.93–1.05 | 0.45–0.75 | 1.40–1.70 | 0.025 | 0.015 | 1.40–1.65 | ≤0.10 |
| 100CrMo7 | 0.93–1.05 | 0.15–0.45 | 0.25–0.45 | 0.025 | 0.015 | 1.65–1.95 | 0.15–0.30 |
Note: The GCr15 phosphorus and sulfur limits shown are for the ordinary-quality category. Higher metallurgical quality categories have stricter limits. Additional residual-element and cleanliness requirements apply under the relevant standards.
The primary mechanical acceptance property for these bearing steels in the annealed delivery condition is Brinell hardness.
| Steel Grade | Reference Condition | Hardness (HBW) |
|---|---|---|
| GCr15 | Hot-Rolled, Spheroidized Annealed, YB/T 4146-2016 | 179–217 |
| 100Cr6 | Spheroidized Annealed (+AC) | ≤207 |
| 100CrMnSi6-4 | Spheroidized Annealed (+AC) | ≤217 |
| 100CrMnSi6-6 | Spheroidized Annealed (+AC) | ≤217 |
| 100CrMo7 | Spheroidized Annealed (+AC) | ≤217 |
The four European-grade values refer to EN ISO 683-17. GCr15 values refer to seamless tube delivery requirements under YB/T 4146-2016.
Yield strength, tensile strength, and elongation depend on processing history and heat-treatment condition. These properties should be established through the applicable purchase specification rather than treated as universal values for bearing steel tubes.
- Seamless Hot Working
- Cold Drawing / Cold Rolling
- Heat Treatment
- Straightening
- Dimensional Inspection
- Surface & Material Inspection
- Packing
The process sequence is adjusted according to tube dimensions, specified delivery condition, and inspection requirements.
TORICH can supply bearing steel tubes with customized dimensions, cutting lengths, heat treatment, and inspection documentation according to the agreed technical specification.
A: We are a manufacturer, and we can also do trading.
A: Generally speaking, it is 10–15 days if the goods are in stock, or 30–40 days if the goods are not in stock. It depends on the quantity.
A: Yes, we can offer the sample free of charge, but the buyer needs to pay the freight cost.
A: For payments ≤2000 USD, 100% in advance. For payments ≥2000 USD, 30% T/T in advance, with the balance paid before shipment. If you have any other questions, please feel free to contact us.
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