Product Specification

Product Description

Martensitic Hardened Steel Balls for High-Impact Grinding: A Deep Dive into 440C Stainless Steel

Understanding 440C Stainless Steel

Key Properties of 440C Stainless Steel

• Hardness: 440C stainless steel can harden to a minimum of 58 Rockwell "C" (HRC), making it one of the hardest types of stainless steel available. This hardness is achieved through a heat treatment process, which enhances its ability to resist wear and abrasion.
• Density: The density of 440C stainless steel is approximately 0.277 pounds per cubic inch (7.67 g/cm³), which contributes to its robustness and stability in various applications.
• Magnetic Properties: This material is strongly attracted by magnetic fields, which can be advantageous in certain industrial applications.
• Machinability: In its hardened state, 440C can be ground, honed, and lapped using conventional abrasives. It can also be shaped and drilled using advanced techniques such as electric discharge machining or ultrasonic cavitation.
• Weldability: While welding 440C stainless steel can be challenging due to its high carbon content, it can be resistance welded with difficulty. Soft soldering, silver soldering, or brazing are possible but may affect the material's hardness.

Applications of Martensitic Hardened Steel Balls

Precision Bearings and Anti-Friction Bearings

Valves and Conveyor Systems

Medical Instruments and Food Processing

Oil Refinery and Quick Coupling Devices

Chemical Composition of 440C Stainless Steel

• Carbon: 0.86 - 1.20%
• Chromium: 16.0 - 18.0%
• Manganese: 1.0% max
• Silicon: 1.0% max
• Molybdenum: 1.0% max
• Sulfur: 0.03% max
• Phosphorus: 0.04% max

Advantages of Using 440C Stainless Steel Balls

• High Wear Resistance: Ideal for applications involving high-impact grinding.
• Corrosion Resistance: Suitable for use in environments exposed to corrosive substances.
• Precision: Can be finished to a high dimensional quality, ensuring accuracy in applications.
• Versatility: Used across various industries, including automotive, aerospace, and medical sectors.

Physical Parameters

 Features

1. Anti-erosion and corrosion resistance.
2. No magnetic and demagnetization character, HRC≤26.
3. It applies to grinding of various materials.
4. Good shape of ball with Smooth and gloss surface.  
5. Its one of the most Cost- effective ball mill media. 

Exhibition & Partner

Case

Ship to Poland

Ship to France

FAQ

1. What are stainless steel mill balls?

Stainless steel mill balls are spherical components made from stainless steel, used primarily in grinding, milling, and mixing applications. They are known for their durability, corrosion resistance, and ability to withstand high-stress environments.

2. What materials are stainless steel mill balls made from?

Common materials include:

• 304 Stainless Steel: General-purpose, corrosion-resistant.

• 316 Stainless Steel: Higher corrosion resistance, ideal for harsh environments.

• 420 Stainless Steel: Harder and more wear-resistant.

• 440C Stainless Steel: High hardness and wear resistance, suitable for heavy-duty applications.

3. What are the primary uses of stainless steel mill balls?

• Grinding and milling media in industries like mining, chemicals, and pharmaceuticals.

• Mixing and dispersing in paint, ink, and food production.

• Precision components in bearings, valves, and pumps.

• Decorative or functional elements in furniture and art.