Delivery program
Material shape
View delivery program
Material shape
Since 1974, Maatmetaal has been trading in continuously cast bronze bars, tubes and blocks. Since 1987, Maatmetaal has been casting bronze tubes centrifugally itself.
With modern electric induction melting furnaces and various centrifugal casting machines, we are able to produce tubes in the range from Ø 200 to Ø 1250 mm, with a maximum casting weight of 2.5 tons, quickly and well. Our in-house laboratory, where chemical analyses, hardness measurements, dye-penetrant tests and pressure tests are carried out, supports and controls production and guarantees top quality. Maatmetaal is a DNV-approved foundry, something we are proud of.
Centrifugal and continuous casting
When and why
The continuous casting process is relatively fast and economical because it is produced in much larger volumes. The disadvantage is that the size range is limited with, depending on the alloy, a maximum diameter of about Ø 454 mm. Also, the delivery range is limited to standard dimensions. This can often only be deviated from with minimum production quantities.
Maatmetaal can deviate from standard sizes with centrifugal casting; also, as described above, we can cast much larger sizes this way. Where the size range of continuous casting stops, centrifugal casting continues.
Both methods of production are very reliable and provide very consistent material density, chemical composition and mechanical values as established in the standard. You can come to us for both continuous and centrifugally cast material!
Centrifugal cast bronze
Production Process
Casting is done using centrifugal casting machines. On these machines, metal scallops rotate at high speed. A quantity of molten material is poured into this spinning metal mold. Centrifugal forces push the bronze against the inside of the metal form. After casting, the tube is cooled and the bronze solidifies. As more liquid material is poured into the tube, a tube with a greater wall thickness is created.
Due to the high speed at which the scallops rotate, a very dense and homogeneous structure is created. This achieves much higher values with respect to tensile strength and hardness, for example, compared to other casting techniques with the same insert.
Continuously cast bronze
Production Process
The continuous casting process was developed as an alternative method for producing bronze without sand molds. The process involves casting molten bronze in a feed furnace on which a water-cooled graphite mold is mounted at the bottom of the furnace. The rod or tube is pulled horizontally or vertically from the furnace while static pressure continuously feeds the liquid bronze through the mold. The mold determines the shape and structure of the continuously cast rod thus produced. The solidification process of the bronze begins at the water-cooled mold on the outside of the ingot. As the ingot advances along the length of the machine, the core solidifies further. The rod is then cut to the length specified by the customer.
Hover over a number for a description:
Types of bronze
Product Features
Tolerances
Continuously cast bronze
round bar/tube
| Bar/bushing diameter | Outer diameter | Inside diameter | Straightness |
|---|---|---|---|
| Up to Ø 172 mm | -0/+0.6 mm | +0/-0.6 mm | 1 mm/m |
| Ø 173 – Ø 252 mm | -0/+1.0 mm | +0/-1.0 mm | 5 mm/m |
| Ø 253 – Ø 504 mm | -0/+1.5 mm | +0/-1.5 mm | 5 mm/m |
| All solid bars and tubes with outside diameters up to 172 mm are mechanically aligned. The specified machining allowances are sufficient for finished lengths up to 250 mm. For finished lengths greater than 250 mm, especially with an outside diameter > Ø 172 mm, a larger machining allowance may be required. | |||
