| AISI | JIS G3506 | GB/T 4354 / GB/T 699 | EN ISO 16120 |
|---|---|---|---|
| 1085 | SWRH82A SWRH82B | 82B · 85 | C86D |
| C | Si | Mn | P | S | |
|---|---|---|---|---|---|
| 1085 | 0.80–0.90% | 0.10–0.30% | 0.60–0.90% | ≤0.040% | ≤0.050% |
| SWRH82A | 0.79–0.86% | 0.10–0.35% | 0.30–0.60% | ≤0.030% | ≤0.030% |
| SWRH82B | 0.79–0.86% | 0.10–0.35% | 0.60–0.90% | ≤0.040% | ≤0.030% |
| Item | Value | ||||
|---|---|---|---|---|---|
| Hardness (through-hardened, surface) | HRC 60–66 | ||||
| Density | 7.85 g/cm³ | ||||
| Tensile strength | 1,800–2,200 MPa | ||||
| Elongation | hardened <2% / annealed 5–10% | ||||
| Melting range | Ferromagnetic | ||||
| Corrosion resistance | Low — shipped in anti-rust oil; zinc / nickel plating available | ||||
| Ball diameter variation | Spherical deviation | Surface roughness | Diameter variation | Diameter tolerance | |
|---|---|---|---|---|---|
| Grade | Vdws | △Sph | Ra | Vdwl | Tdn |
| Not Over | |||||
| μm | |||||
| 10 | 0.25 | 0.25 | 0.02 | 0.5 | * |
| 16 | 0.4 | 0.4 | 0.032 | 0.8 | * |
| 20 | 0.5 | 0.5 | 0.04 | 1 | * |
| 24 | 0.6 | 0.6 | 0.05 | 1.2 | * |
| 28 | 0.7 | 0.7 | 0.06 | 1.4 | * |
| 40 | 1 | 1 | 0.08 | 2 | * |
| 60 | 1.5 | 1.5 | 0.10 | 3 | * |
| 100 | 2.5 | 2.5 | 0.1 | 5 | ±12.5 |
| 200 | 5 | 5 | 0.15 | 10 | ±25 |
| 500 | 12.5 | 12.5 | * | 25 | ±50 |
| 1000 | 25 | 25 | * | 50 | ±125 |
| Dia. (mm) | Inch | Weight / pc (g) | ||||
|---|---|---|---|---|---|---|
| 2.0 | — | 0.033 | ||||
| 3.0 | — | 0.111 | ||||
| 3.175 | 1/8" | 0.132 | ||||
| 4.762 | 3/16" | 0.444 | ||||
| 5.0 | — | 0.514 | ||||
| 6.0 | — | 0.888 | ||||
| 6.35 | 1/4" | 1.052 | ||||
| 7.938 | 5/16" | 2.056 | ||||
| 8.0 | — | 2.104 | ||||
| 9.525 | 3/8" | 3.551 | ||||
| 10.0 | — | 4.110 | ||||
| 12.7 | 1/2" | 8.420 | ||||
| 15.875 | 5/8" | 16.45 | ||||
| 19.05 | 3/4" | 28.41 | ||||
| 25.4 | 1" | 67.35 | ||||
Every low carbon steel ball starts from certified raw material. RISHENG sources low carbon steel wire rod (AISI 1010 / S10C / DC01) from qualified mills with controlled sulphur and phosphorus content for defect-free forming.
- Wire rod is cut into precise slugs and cold-headed into ball blanks on our Z32-7.5 machines
- Cold forming keeps the metal fiber flow continuous — a stronger internal structure than machined balls
- This step defines the ball's initial size and grain structure
- Cold-headed blanks carry a thin equator ridge ("flash") left by the forming dies
- Balls are rolled between heavy cast-iron file plates to remove the ring band
- Result: a uniform, near-spherical blank ready for grinding
Before heat treatment, the soft blanks are ground on our M360 machines to
remove the flashing marks and bring the diameter close to size, leaving a
uniform grinding allowance for the hardened finish passes.
High carbon steel balls are through-hardened, not case-hardened. For AISI 1085 high carbon steel balls, RISHENG typically austenitizes the balls at 790–830 °C, followed by oil quenching to form a hard martensitic structure. The balls are then tempered at 160–200 °C for 60–120 minutes, depending on ball diameter, target hardness and application requirements.
Hard grinding is the method of grinding the ball after heat treatment with grinding wheel in the grinding machine. Its role is to further improve the accuracy and surface quality.
Multi-stage degreasing removes grinding fluid and residues before inspection
Automatic sorting machines screen every ball by diameter
Surface-defect sorting plus visual inspection remove any out-of-tolerance balls
Nothing is sampled — 100% of balls are sorted
- QC verifies diameter variation, sphericity, surface roughness and hardness with calibrated measuring instruments
- Eddy current testing (ECT) detects surface cracks and hidden defects
- An inspection report is issued for each batch of low carbon steel balls
Hard all the way through
Quenched and tempered to HRC 60–66 — through-hardened, not a thin case — so the ball keeps its wear resistance even after the surface wears in. Hardness is Rockwell-tested per lot and stated on the inspection report.
Built for cyclic load.
The 0.8%+ carbon martensite gives high compressive and fatigue strength for heavy casters, tracks and unground bearings.
Changzhou Risheng Steel Ball Co., Ltd. is located on the eastern shore of Taihu Lake, adjacent to Shanghai, with convenient transportation. Since its establishment in June 1995, the company has been dedicated to developing and manufacturing steel balls, integrating research and development with trade.
For many years, Risheng building on the foundation of the Wujin Metal Ball Research Institute, has been committed to researching steel ball manufacturing technology. We primarily produce shaft steel balls (AISI 52100), stainless steel balls (AISI 201/304/316/420/440/430), and carbon steel balls (AISI 1015/1045/1085) with diameters ranging from 0.8mm to 25.4mm, with precision grades up to G10, G40, and G100. We also offer custom specifications for alloy steel balls, military steel balls, copper balls, UFO balls, ceramic balls, and other metal balls.
High-strength inner packaging: Shockproof foam bags or custom plastic boxes are used to secure each High Carbon steel ball in place, protecting it from impacts and scratches.
Moisture-proof protection: A moisture-proofing agent is added to effectively prevent the impact of moisture on the product during transportation.
Sturdy outer packaging: Thickened corrugated cardboard boxes or wooden pallets (for large orders) are used to ensure safe long-distance transportation.
Clear labeling: Product specifications, quantity, and drop warnings are clearly marked on the outer packaging box for easy verification and safe handling.
High carbon steel wire (e.g., AISI 1085) is cold-headed into blanks, flashed, and ground. The balls are then heated to ~1500–1600°F, quenched to lock in hardness, and tempered to reduce brittleness. Final grinding and polishing ensure dimensional accuracy and smooth surfaces. They meet ABMA standards for sphericity and tolerance (e.g., ±0.0001" for Grade 100).
High carbon steel balls are made from steel alloys with 0.6–1.2% carbon, such as AISI 1060, 1070, or 1085. They contain iron as the primary element, with trace amounts of manganese, sulfur, and phosphorus, but minimal alloying elements like chromium (unlike chrome or stainless steel). They are typically through-hardened for uniform strength.
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