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Iron-base alloys, the most widely used hardfacing materials, combine versatility with moderate cost. They achieve wear resistance by forming carbides and martensite, a hard matrix structure that forms on quenching and toughens with tempering. Pearlitic alloys, usually containing less than 0.30 percent carbon, are comparatively soft and ductile.Nickel-base alloys resist corrosion and heat better than iron-base alloys, They come in three types, depending on the hard phase (boride, carbide, or Laves) that forms on cooling, In boride-containing alloys, large amounts of chromium borides provide wear resistance.Cobalt-base alloys provide more high-temperature corrosion resistance than iron-base and nickel-base grades. Carbides or Laves-phase give wear resistance.

Steam generators might have commanded an unimpressive 1-2% of the market''s volume for the year ending November 2001, but they grew in value by 70-80% so that they now represent 6% of the market''s worth. And, in the three months leading up to November 2001 alone, sales increased by 29% (volume) and 44% (value), according to one manufacturer. The total market for irons is now worth an annual 115 million [pounds sterling], accounting for four-and-a-half million units.SNAGPrice has so far been the greatest snag in makers'' intentions to flood the market with steam generators. Punters who might have paid 30 [pounds sterling] for their previous iron, will find it hard parting company with 150 [pounds sterling] for a new one, unless of course it is revolutionary.