AISI 440C / SUS440C / 1.4125 Material Equivalents Table
| GB/T | AISI | EN | ISO |
|---|---|---|---|
| 9Cr18 | 440C | 10088-3 | SUS440 |
Chemical Composition of SUS440C / 1.4125 Steel Balls
| C | Si | Mn | P | s | Cr | Cu | Ni | Mo | |
|---|---|---|---|---|---|---|---|---|---|
| 440C | 0.95-1.20% | 1.0% | 1.0% | 0.04% | 0.03% | 16.0-18.0% | \ | 0.6% | 0.40-0.80% |
Technical Specifications of 440C Stainless Steel Balls
| 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 |
100% Controlled In-House Heat Treatment: Unlike trading companies that outsource heat treatment to cheaper third-party facilities, Risheng runs all quenching internally. This prevents material brittleness and ensures absolute batch-to-batch hardness consistency.
Automotive-Grade Automated Optical Sorting: To guarantee zero surface defects, our entire output undergoes 100% automated optical inspection systems, filtering out any micro-cracks, surface discoloration, or irregular diameter flaws.
Massive Ready-to-Ship Inventory for Global Wholesale: As an authentic source factory in China, we maintain a steady stockpile of standard fractional and metric AISI 440C/SUS440C balls to ensure seamless supply chain response and rapid global shipping for your urgent wholesale demands.
Large-Scale Steel Ball Production Output & Annual Capacity
Massive Annual Output: Our stainless steel ball factory outputs over 5,000 metric tons of high-precision industrial steel balls annually, guaranteeing an uninterrupted supply chain for global rolling bearing distributors.
Wholesale Contract Optimization: Our production lines are tailored for bulk 440C stainless steel balls contracts, offering consistent metallurgical and dimensional quality from single-container orders to massive scheduled wholesale releases.
Advanced Stainless Steel Ball Grinding & Manufacturer Infrastructure
Precision Infrastructure: Our workshop operates 80+ sets of high-speed heading machines and advanced micro-lapping plates to produce superior G10 grade steel balls with a mirror polish ($Ra \le 0.025 \mu m$).
Vacuum Heat Treatment: All AISI 440C / SUS440C stainless steel balls undergo in-house computer-controlled oil quenching and tempering, permanently securing the mandatory HRC 58-65 hardness range without brittleness.
Global Logistics & OEM Flexibility
Precision Inspection via Digital Micrometer
Changzhou Risheng Steel Ball Co., Ltd. (Risheng) is an ISO 9001 certified source manufacturer specializing in the cold heading, heat treatment, and precision grinding of premium stainless steel balls.
With over 20 years of manufacturing expertise, we skip middle trading companies to supply factory-direct wholesale solutions. We ensure consistent material integrity, uncompromised precision grades, and major cost savings for global bearing and fluid control industries.
Our Precision Steel Ball Production Lines：
AISI 440C / SUS440C / 1.4125 Balls: Through-hardened to HRC 58-65, our flagship series for precision rolling bearings and high-pressure valves.
AISI 316 / 316L / 1.4401 Balls: Marine-grade, strictly non-magnetic stainless steel balls for medical devices and cosmetic lotion pumps.
AISI 420 / SUS420 / 1.4021 Balls: Optimal HRC 50-55 hardness post-heat treatment, serving as an economic choice for slide rails and hardware.
Specialty Shaped Media: Flying saucer steel balls (ballcones) engineered as heavy-duty tumbling media for vibratory finishing.
Industrial Manufacturing Capacity & Quality Standards
5,000+ Tons Annual Output: Ensuring uninterrupted wholesale steel ball supply for multinational assembly lines and global distributors.
200+ Tons Rolling Stock: Permanent inventory of standard-size 440C bearing balls for rapid global shipping within 3-7 business days.
G10 Precision Grades: Advanced micro-lapping plates and automated optical sorting infrastructure secure a zero-defect mirror polish ($Ra \le 0.025 \mu m$).
100% Traceability: We source wire coils exclusively from top-tier mills (Baosteel/Tisco). All bulk orders include a Material Test Certificate (MTC).
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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