Shandong steel ball manufacturer directly supplies precision magnetic steel balls with magnetic roller in sizes ranging from 0.3mm to 60mm.

Steel balls, also known as steel spheres or ball bearings, are crucial basic components, especially precision steel balls play a significant role in the national economic development. Under certain special conditions, steel balls made of specific materials are often required to meet the functional requirements in different environments. In fact, special material steel balls are already widely used in various fields of the national economy, including 9Cr18, 3Cr13 stainless steel, copper, aluminum, titanium alloys, and agate, glass, ceramic balls, etc. Their promotion and application not only promote the development of the steel ball production industry but also facilitate technological progress and development in related industries.

Steel ball classification:

(1) Categorized by material: Stainless Steel Balls, Bearing Steel Balls, Carbon Steel Balls.

(II) Categorized by grade: High grade, Standard grade, Low grade.

Carbon Steel Balls，Based on whether heat treatment, or heating, is applied, there are two types.After heat treatment, the hardness of carbon steel balls increases, with the surface hardness reaching about HRC60. Carbon steel balls that have not been heat treated have a hardness similar to the steel, around HRC28, commonly known as iron balls. These two types have different prices; the heat-treated ones are more expensive, but that doesn't necessarily mean the heat-treated carbon steel balls are better. Heat-treated carbon steel balls cannot be welded, and even if they are, they are not secure and can fall off upon impact. If you need to weld, you must choose unheat-treated carbon steel balls. 

  Bearings steel ballIt's crucial to have a tiered structure, meaning...Bearings steel balls come in many precision levels.According to the National Standard GB/T308-2002 grading list, it is divided into G5, G10, G16, G28, G40, G60, G100, G200, G500, G1000, etc. The letter "G" stands for Grade in English, and the numbers following indicate different levels.The smaller the number, the higher the precision, the better the ball bearing.High precision is commonly used in industries requiring high accuracy, such as precision machinery, automotive parts, aerospace, etc., while low precision is generally used in industries like grinding, crushing, and stirring. 

  Stainless Steel BallsMainly categorized by material into grades 201, 304, 302, 316, 316L, 420, 440, 440C, etc., with both national standard stainless steel materials and a wide variety available in the market.Non-standard materials, primarily lacking in nickel and chrome content; cutting corners.Therefore, the rust and corrosion resistance is significantly lower. That's why it's easy to purchase non-standard stainless steel balls that are simply priced, and that's also why they rust soon after you buy them. 

The quality of steel balls on the market varies greatly, with some merchants selling substandard products. To purchase the right steel balls for your needs without wasting money, you must sharpen your eyes and gain more knowledge.Steel Ball KnowledgePartner with reputable businesses!

Magnetic 

All Austenitic stainless steel balls are typically non-magnetic; some magnetism may be noticeable after cold working. Standard:ISO3506 GB/T 
3098.6 The characteristic of magnetization ability of various materials also applies to stainless steel. It is only possible to be completely non-magnetic in a vacuum state. Materials in a magnetic fieldThe measurement of magnetic permeability is relative to the material's permeability in a vacuum.μr stands for relative permeability. If μr is close to 1, the material has a low permeability.

In everyday life, we often encounterUsing a magnet to determine if it's stainless steel is actually a very incorrect method of judgment.。

Stainless steel is categorized intoAustenitic stainless steel and Martensitic stainless steel, wherein201, 304, 316, and 316L are Austenitic stainless steels without magnetic properties; whereas 420, 430, 440, and 440C are Martensitic stainless steels, commonly known as "rustproof iron" in our country. The name comes from their magnetic nature. However, not all magnetic rustproof capabilities are poor, let alone that magnetism equals iron. Among them, 440 and 440C are top performers in stainless steels, known as special steel. They offer excellent rust and corrosion resistance, along with high hardness, making them known as stainless steel bearing steel. They are widely used in high-precision manufacturing industries.

Therefore, we cannot simply judge whether it is stainless steel based on whether it is attracted or not by a magnet. So 440 Stainless Steel BallsOf course, it's made of stainless steel, and it's high-quality stainless steel, too.

We've got all your concerns and questions addressed here, answered one by one:

How to choose steel balls?

(1). If you need high hardness and wear resistance, choose wear-resistant bearing steel balls; secondly, fire-treated carbon steel balls.

(2). If you want to weld something with low hardness, you should use carbon steel balls without fire, commonly known as iron balls.

(3). For excellent rust resistance, choose stainless steel balls, available in 304, 316, and 316L grades, with rust resistance increasing in that order.

(4). For excellent rust prevention and high hardness, choose the 440 stainless steel ball.

(5). For high precision, choose a higher grade; the smaller the number, the higher the grade, and the better the precision.

 If the above doesn't clarify your疑问, and you're still unsure about the type of steel ball you need, feel free to contact our customer service. Clearly explain your application, and our professional team will provide you with a detailed answer to your satisfaction!

2. Quality Assurance

(1). Raw Material Assurance: Steel billets sourced from major steel mills.

(2). Production Equipment Assurance: Introduction of production equipment and testing instruments.

(3). Technical Staff Support: Over a decade of technical staff are on 24/7 rotating duty to oversee and manage production.

(4). Rigorous production management system with strict constraints: stringent management, adherence to production regulations, traceable accountability in reverse.

(5). A sealed and tidy dust-free workshop: Ensures high precision production of precision steel balls.

3. Shipping Information

（1). Samples via SF Express: A limited number of samples are available free of charge, with shipping costs to be paid by the recipient.

(2) Shipments under 300 kg are handled by Yousu Express, Best Express, Deppon Logistics, Jiayi Logistics, Shangqiao Logistics, and others.

(3). Shipments over 300 kg use dedicated logistics, generally pick up at city logistics, if pickup at the county/district is required, please specify; additional delivery fee applies for delivery service.

4. Packaging

We offer a variety of packaging options, including woven bags, cardboard boxes, pallets, steel drums, bottled, and ton bags, and can customize packaging to meet customer requirements.

5. Where is the shipment origin from?

Due to our factory being located in a rural area, logistics and express delivery are not convenient. Therefore, we have rented a large warehouse in a major logistics park in Liaocheng city to store goods and ship them to customers.

6. Return & Exchange Policy

If it's our responsibility for the quality not meeting the standards, we will cover the shipping costs for both ways and handle the exchange or return. If it's the buyer's responsibility, exchanges or returns are possible as long as they don't affect resale, with the buyer covering the shipping costs both ways.