Understanding 7-Wire Compact Steel Strands Manufacture

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Manufacturing Process of Compacted 7-Wire High-Tensile Prestressing Strand

Ingenuity (Structural) (OP) - 9 Aug 22 03:08

Does anyone know if after standard 7-wire strand is produced, it gets heated before being processed through compacting rollers/dies, or is it a cold procedure? I couldn't find comprehensive manufacturing data about compacting strands on the internet. Any insights would be highly appreciated!
I have a project that may necessitate utilizing compacted 7-wire prestressing strands. I have worked with 1/2" and 0.6" diameter strands but have limited knowledge about compacted versions. Please share any information about whether these strands undergo heating before compaction.

Reach out to us to discuss your needs with our experienced sales team, who can help you identify the best options. Visit our site: Prestressed Steel Wire Supplier.

RE: Manufacturing Compacted 7-Wire High-Tensile Prestressing Strand

dik (Structural) - 9 Aug 22 03:26

I'm not aware of any specifics, but I suppose many standard strands are used in pre-tensioning applications, given their enhanced bonding conditions.

RE: Manufacturing Compacted 7-Wire High-Tensile Prestressing Strand

Ingenuity (Structural) (OP) - 9 Aug 22 03:36

Interestingly, it is not typically used in pre-tensioning applications, and my research indicates no North American manufacturers or suppliers. BRIDON in the UK originally developed it, known as 'DYFORM', and it sees occasional usage in Europe for specialized applications. BEKAERT, after merging with BRIDON, now manufactures compact strand in Belgium. I'm curious if the wire rope compaction process applies to forming compact prestressing strands.

RE: Manufacturing Compacted 7-Wire High-Tensile Prestressing Strand

dik (Structural) - 9 Aug 22 03:42

Compact wire rope is common, but compact stressing cables are rare. I wasn’t aware of their existence.

RE: Manufacturing Compacted 7-Wire High-Tensile Prestressing Strand

Ingenuity (Structural) (OP) - 9 Aug 22 04:24

Quote (EN 10138-3:2005)

6.2.4 7-wire compacted strand
After stranding, the seven-wire strand is compacted through drawing or rolling before stress relief treatment. When stranding and compacting are simultaneous, the central wire should match the diameter of the outer helical wires with a lay length of 14 to 18 times the nominal strand diameter.

Based on the process outlined in European Standard EN10138-3, it appears that compacting happens after stranding but before stress relieving, indicating a cold drawing/rolling process.

RE: Manufacturing Compacted 7-Wire High-Tensile Prestressing Strand

EdStainless (Materials) - 9 Aug 22 12:37

Compacted cables lack flexibility and are unsuitable for applications involving motion. It’s a cold process with low-temperature stress relief, commonly applied in springs. The primary advantage is a slightly reduced size.

RE: Manufacturing Compacted 7-Wire High-Tensile Prestressing Strand

Ingenuity (Structural) (OP) - 9 Aug 22 18:35

Thanks, Ed.
My application is stationary. I am replacing several corroded 1/4" diameter wire tendons in a post-tensioned concrete slab with compacted 7-wire strand, which offers a smaller diameter and increased tensile strength for equivalent capacity.

RE: Manufacturing Compacted 7-Wire High-Tensile Prestressing Strand

SwinnyGG (Mechanical) - 9 Aug 22 18:44

Quote (EdStainless)

Besides reduced size, the motivation for using it.

I've seen its usage due to lower stretch compared to standard wire rope. Nonetheless, it remains uncommon.

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Prestressed 7-Wire Strands Overview

We provide prestigious prestressed 7-wire strands that meet rigorous quality standards. With an integrated production chain, we ensure continuous quality inspections and product traceability.

Our prestressed products cater to industries such as rail infrastructure, construction, energy, and precast concrete. Applications range from preloaded prefabricated parts and bridge construction to rock anchors, large containers, and hoisting technology for heavy loads.

These 7-wire strands are available in cross-sectional areas from 52 mm² to 150 mm² and may come with smooth or profiled surfaces. Compacted versions feature cross-sectional areas up to 165 mm², all showcasing low relaxation properties.

voestalpine Wire Technology also offers a variety of rod dimensions with plastic sheathing, and options for oiling, galvanizing, greasing, or waxing to enhance corrosion resistance, making them suitable for diverse applications.

Learn more by visiting our website: Prestressed Steel Wire Supplier China.