Delivery Information – BJ Magnets

Delivery information

Our Trading hours are Monday to Thursday 08h30 am – 05:00 pm; Friday 08h30 am – 03:00 pm.

All confirmed orders placed by 11:00 will be sent on the same day via the following methods.

Total Delivery Time = Processing Time + Shipping Time

Processing Time: Before we ship your order, we need to make sure that the payment made online has been successful and has reflected in our bank account; in which case we will have to prepare your products, perform strict quality-control tests and package of the items carefully.

● Expedited Shipping: 1-3 business days
● Standard Shipping: 3-8 business days
● Flat Rate Shipping: 10-30 business days

Courier

The delivery address must be a physical address. Someone will need to be available at the address to receive the delivery. Deliveries are made during business hours from Monday to Friday.

NB: courier prices are subject to change without prior notice.

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We work closely with our customers to design sustainable magnetic separator equipment that optimizes productivity and efficiency. Our commitment extends to skills development and capacity building within our team, promoting continuous improvement.

We offer superior engineering consultancy services, focusing on innovation and tailored solutions to meet unique customer requirements. Our holistic approach ensures cost-efficient, effective solutions.

We design and manufacture magnetic assemblies tailored to your specifications, enhancing performance while minimizing costs. Our experienced engineers utilize 2-D and 3-D magnetic modeling programs for precision.

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magnetic properties

Magnetic and non-Magnetic Stainless Steel

There are several families of stainless steels with different physical properties. The magnetic properties of stainless steel are very dependent on the elements added into the alloy. A basic stainless steel has a ‘ferritic’ structure and is magnetic, formed from the addition of chromium – it can be hardened through the addition of carbon, making it ‘martensitic’. However, the most common stainless steels are ‘austenitic’ – these have a higher chromium content and nickel is also added. It is the nickel which modifies the physical structure of the steel and makes it theoretically non-magnetic.

304 stainless steel contains chromium (min. 18%), and nickel (min. 8%). It is an austenite steel and is only slightly responsive to magnetic fields. It also contains 18 – 20% chromium and 8-10.50% nickel, and lesser quantities of some other elements.

316 stainless steel is a molybdenum-alloyed steel. The fact that it is also negligibly responsive to magnetic fields means that it can be used in applications where a non-magnetic metal is required. It also contains a number of other elements in varying concentrations.

Transformation from non-magnetic to magnetic phases

As both 316 and 304 stainless steels are austenitic, when they cool, the iron remains in the form of austenite (gamma iron), a phase of iron which is nonmagnetic. The different phases of solid iron correspond to different crystal structures. In other alloys of steel, this high-temperature phase of iron transforms to a magnetic phase when the metal cools. The presence of nickel in the stainless steel alloys stabilizes austenite against this phase transition as the alloy cools to room temperature. This corresponds to a somewhat larger magnetic susceptibility than we might expect for other nonmagnetic materials, but is still well below what might be considered magnetic.

However, this does not mean that you should expect to measure such a low susceptibility on any item of 304 or 316 stainless steel that you encounter. Any process which can change the crystal structure of stainless steel can cause austenite to be converted to the ferromagnetic martensite or ferrite forms of iron. These processes include cold working and welding. It is also possible for austenite to spontaneously convert to martensite at low temperatures. To complicate matters further, the magnetic properties of these alloys depend on the alloy composition. Within the allowed ranges of variation of Ni and Cr, significant differences in magnetic properties may be observed for a given alloy.

Practical implications for removal of stainless steel particles

Both 304 and 316 stainless steel possess paramagnetic characteristics. As a result of these properties, small particles (approx < 0.5mm dia sphere for example) can be attracted to powerful magnetic separators positioned in the product stream. Depending upon their weight and specifically their weight ratio to magnetic attraction, these small particles will be held to the magnets during the production process.

These can then be removed during the magnet cleaning operation. From our experience 304SS small particles are more likely to be held in the flow than 316 SS particles due to its slightly more magnetic nature.