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News

Sandvik targets centrifugally cast hollow bar market

Sandvik Coromant UK : 16 June, 2006  (New Product)
Recent expansion of the size range for Sandvik Sanmac, enhanced machinability, stainless steel hollow bar, has enabled Sandvik Materials Technology to compete effectively in the large diameter size area, where centrifugally cast hollow bar has traditionally held a strong market share. The new, larger diameter sizes, between 300mm outside diameter by 200mm inside diameter and 420mm by 300mm, are produced in stainless steel grades Sandvik Sanmac 304L and 316L. They have all of the improved machinability benefits of the Sanmac family of stainless steels, which do not jepordise key properties such as corrosion resistance and mechanical strength. All are available from stock in lengths of 3.5 to 5 metres.
Recent expansion of the size range for Sandvik Sanmac, enhanced machinability, stainless steel hollow bar, has enabled Sandvik Materials Technology to compete effectively in the large diameter size area, where centrifugally cast hollow bar has traditionally held a strong market share.

The new, larger diameter sizes, between 300mm outside diameter by 200mm inside diameter and 420mm by 300mm, are produced in stainless steel grades Sandvik Sanmac 304L and 316L. They have all of the improved machinability benefits of the Sanmac family of stainless steels, which do not jepordise key properties such as corrosion resistance and mechanical strength. All are available from stock in lengths of 3.5 to 5 metres.

In machining tests, Sandvik has proved that the manufacturing process for producing centrifugally cast hollow bar dictates that lower cutting speeds and feed rates must be used - two key factors in reducing productivity of machined components used in valves, pumps, flow meters, fittings and mechanical seals for the process industries.

To demonstrate the difference in machinability between Sandvik Sanmac 316L hollow bar and 316L centrifugally cast material, Sandvik undertook turning tests on 300mm by 200mm hollow bar material using grade GC 2025 inserts from sister company Sandvik Coromant.

To the point where poor chip breaking and plastic deformation in the materials are evident, ie within the parameters of controlled machinability, approximately
10 minutes of tool life was obtained. Sandvik Sanmac material achieved maximum cutting speeds of up to 290m/minute and a maximum feed rate of up to 0.7mm/revolution compared with centrifugally cast material of 180m/minute max. and 0.4mm/revolution max.

By reducing feed rates to 0.3mm/rev for both materials, it is possible to increase tool life to 15 minutes but significantly, Sandvik Sanmac materials achieve cutting speeds of 200m/minute compared to 125m/minute for the competitor material, an impressive 60% faster cutting speed for the Sandvik material.

The Sandvik Sanmac family of stainless machining steels is the result of extensive research and process development by Sandvik Materials Technology to improve machinability. They are produced with the optimum chemical composition, optimised non-metallic inclusions and closely controlled production and process parameters. Working in close co-operation with sister company, Sandvik Coromant - a world leader in cemented carbide cutting tools and tooling systems - Sandvik's Sanmac stainless steels reduce machine tool wear, increase cutting speeds, improve productivity and result in significant cost reductions per produced component.

A key benefit of buying Sandvik's Sanmac products is that support extends beyond the supply of materials. When required, all products can be supported with technical advice on the selection of material grades, recommended tool inserts and cutting data for a range of machining applications.
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