Sandvik Ab

Sandvik Intellectual Property Ab

Jonas Rosen

Tomas Sh Jansson

Johan Linden

Lars Nylof

Sven B Larsson

A drill string and a threaded coupling region for a drill string include threaded male and female ends that are optimized to maximize energy transmission efficiency for percussion drilling. The coupling includes a male spigot to be received within a female sleeve, such that an axial length of the overlap of the spigot within the sleeve is less than an outside diameter of the sleeve.

Energy transmission efficient drill string coupling

An austenitic Ni-based alloy with improved workability, good corrosion resistance and good structure stability useful as heat exchanger tubing in sulphur-, chloride- or alkaline-containing environments. The material has an austenitic structure which contains in weight-% up to 0.025% C, 20-27% Cr, 8-12% Mo, up to 0.5% Si, up to 0.5% Mn, up to 0.3% Al, up to 0.1% N, 3-15% Fe, up to 0.5% Ti, up to 0.5% Nb, the remainder being Ni and usual impurities.

Austenitic Ni-based alloy with high corrosion resistance, good

A new austenitic stainless steel comprising in % by weight:

Austenitic stainless steel with good oxidation resistance

A composite tube with improved resistance to thermal fatigue and stress corrosion for use in soda recovery units comprising an inner tubing of a conventional carbon steel and an outer liner of a Cr--Ni--Mo--Fe-based alloy with austenitic structure which alloy contains, in weight-%, 0.01-0.04 C, 19.5-23.5 Cr, 38-46 Ni, 2.5-3.5 Mo, up to 0.5 Si, up to 0.3N, and the remainder being Fe, except normal impurities.

Growing community of inventors

Sandviken, Sweden

Jonas Rosen