Internation Standards and Material Codes
| GB/T | AISI | EN | ISO |
|---|---|---|---|
| 9Cr18 | 440C | 10088-3 | SUS440 |
Chemical composition
| C | Si | Mn | P | s | Cr | Cu | Ni | Mo | |
|---|---|---|---|---|---|---|---|---|---|
| 9Cr18 | 0.94% | 0.37% | 0.45% Max. | 0.029% | 0.01% | 17.44% | 0.05 | \ | \ |
| 9Cr18Mo | 0.95-1.20% | 1.0% | 1.0% | 0.04% | 0.03% | 16.0-18.0% | \ | 0.6% | 0.40-0.80% |
440/440C Stainless Steel Ball Physical Properties
| Item | Parameters | ||||
|---|---|---|---|---|---|
| Tensile strength | 285,000 psi | ||||
| Yield strength | 275,000 psi | ||||
| Elastic modulus | 29,000,000 psi | ||||
| Hardness | HRC 58-65 | ||||
| Density | 0.277 lbs/cubic inch | ||||
Grade: G10 to G1000
| Ball diameter variation | Spherical deviation | Surface roughness | Diameter variation | Diameter tolerance | |
|---|---|---|---|---|---|
| Gade | 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 | 1 | 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 |
High hardness and excellent wear resistance.
Good corrosion resistance, suitable for mild corrosive environments (such as humid air, fresh water).
Improve precision and surface finish by fine grinding or polishing the surface.
Good corrosion resistance.
Large-Scale Production Output
As a leading source factory, we operate multiple automated production lines that allow for a massive monthly output to ensure your project timelines are always met.
Monthly Capacity:Over 200 tons of precision steel balls.
Inventory Management: We maintain a ready-to-ship stock of standard sizes (AISI 52100, 304, 316, 440C) for immediate global dispatch, minimizing your lead time.
Advanced Manufacturing Infrastructure
Our facility integrates the latest in cold-heading and precision grinding technology to achieve superior spherical integrity.
Precision Grinding: Equipped with high-speed automated grinding machines that achieve G10 to G100 tolerances.
Heat Treatment: In-house controlled atmospheric heat treatment furnaces ensure consistent Rockwell Hardness (HRC) across every batch.
Material Sourcing: We have long-term strategic partnerships with Tier-1 raw material suppliers, ensuring material purity and cost-stability for our clients.
Global Logistics & OEM Flexibility
Advanced Manufacturing Infrastructure
Strategically headquartered on the eastern shore of Taihu Lake near the Shanghai logistics hub, Changzhou Risheng Steel Ball Co., Ltd. is a premier manufacturer and global exporter specializing in high-precision metal ball solutions.
Founded in June 1995 and built upon the technical legacy of the Wujin Metal Ball Research Institute, we bridge the gap between advanced R&D and industrial-scale production. For over nearly three decades, we have optimized our manufacturing processes to deliver superior durability and precision for critical applications.
Our Core Capabilities:
Material Expertise: Comprehensive production of Chrome Steel Ball (AISI 52100), Stainless Steel Ball (AISI 201/304/316/420/430/440C), and Carbon Steel Ball (AISI 1015/1045/1085).
Precision Range: High-grade manufacturing from 0.8mm to 25.4mm, maintaining strict tolerances across G10, G40, and G100 grades.
Custom Engineering: Beyond standard inventory, we provide tailored OEM solutions for Alloy Steel, , Ceramic, Copper, and specialized geometries (UFO balls).
At Risheng, we don’t just sell components; we provide the precision that keeps global industries moving.
Strategically headquartered on the eastern shore of Taihu Lake near the Shanghai logistics hub, Changzhou Risheng Steel Ball Co., Ltd. is a premier manufacturer and global exporter specializing in high-precision metal ball solutions.
Founded in June 1995 and built upon the technical legacy of the Wujin Metal Ball Research Institute, we bridge the gap between advanced R&D and industrial-scale production. For over nearly three decades, we have optimized our manufacturing processes to deliver superior durability and precision for critical applications.
Our Core Capabilities:
Material Expertise: Comprehensive production of Chrome Steel Ball (AISI 52100), Stainless Steel Ball (AISI 201/304/316/420/430/440C), and Carbon Steel Ball (AISI 1015/1045/1085).
Precision Range: High-grade manufacturing from 0.8mm to 25.4mm, maintaining strict tolerances across G10, G40, and G100 grades.
Custom Engineering: Beyond standard inventory, we provide tailored OEM solutions for Alloy Steel, , Ceramic, Copper, and specialized geometries (UFO balls).
At Risheng, we don’t just sell components; we provide the precision that keeps global industries moving.
High-strength inner packaging: Shockproof foam bags or custom plastic boxes are used to secure each AISI 440 stainless 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.
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