Process	Boronising
	Boronising provides good resistance against abrasive and adhesive wear, high temperatures, and corrosion. It increases the lifetime of extrusion, moulding, cutting, and forging tools. All kind of steel can be processed, but alloy elements reduce adhesion. The process is carried out with powders or pastes. Layer thickness 50-150 micron, 300 for abrasive resistance. The part's volume increases up to 30% (important for tolerances). Only finished parts are treated for avoiding difficult post machinings. Long-time process (1-8 h at 800-1000 C) with limited shape capabilities. Hardening and tempering are necessary post-treatments.
Danish Name	Borering
Category	Surface treatments, Thermal diffusion processes
Materials	Substrates: Plain carbon steel Low alloyed carbon steels Boron (diffusion material)
Price notes	The variable cost of boronising one kg of substrate is about 15/30 DKK.
Price date	November 1996
Photo	Thomas Nissen (Computer graphics)
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