Tungsten Carbide Dies

Carbide dies come from wire drawing, cold heading, tube drawing and extrusion operations. The defining commercial feature of this stream is the steel casing: many dies are supplied as a carbide nib pressed or shrunk into a steel ring or holder, and that steel is often a large share of gross weight.

Uncased nibs, worn drawing dies and broken die halves also occur. A parcel of loose nibs and a parcel of complete cased dies of the same gross weight are very different propositions, which is why the cased and uncased fractions are always described separately.

Steel casing is not contamination in the ordinary sense — it is an integral part of the article — but it is not recoverable tungsten-bearing material either. Removing nibs from casings is possible and is done by some generators, though it takes press work and is not always economic on small pieces.

For evaluation, what matters is a realistic view of the cased-to-uncased ratio and the typical size of the pieces. Where a buyer's process requires nibs only, that requirement should be raised before the lot is confirmed, since it changes both the preparation and the terms.

Surface screening on a cased die reads the casing, not the nib, so handheld measurements on assembled dies say little about the hardmetal inside. Where elemental information is required, it must be taken from exposed carbide, and the sampling and analysis method has to be agreed in writing. Nautica does not operate its own laboratory; testing is carried out by a laboratory or inspection company the parties appoint.

Die parcels are dense and usually modest in volume, so they consolidate well with other hardmetal streams into a single shipment. Quotations are prepared once the cased and uncased fractions, packing and any sorting scope are agreed; terms can be FOB Rotterdam or CIF to the destination port.

Drawing dies, extrusion dies and forming tooling frequently arrive with the carbide nib still pressed or shrunk into a steel casing. The casing can outweigh the nib several times over, so the commercial question on a cased-die parcel is never the gross weight — it is what proportion of that weight is actually carbide.

In practice the share is estimated from casing dimensions, nib bore size and a physical check on a representative sample, rather than assumed from a nominal figure. Where a seller can press out even part of the parcel, the resulting loose nibs are directly assessable and the remaining cased items can be discussed separately.

Condition of the nib itself matters less than sellers often expect. Worn bores, cracked nibs and dies that failed in service are entirely normal in this stream; carbide that has cracked has not lost its recoverable content. Drawing lubricant, soap residue and wire fragments in the bore are the practical nuisance, and draining and brushing the parcel before packing is usually worthwhile.