Surface Finishing Tutorial

#128 Materials and Electroplating

Category : Electroplating

August31, 2012

Material types and difficulty of electroplating are explained.

[Table] Steel Alloys and Plating Difficulties

Type			Characteristics	Application Example	Difficulty Level
Structural Steels	Steructural Carbon Steel		Low carbon	All industrial applications	◎
	Structural Alloy Steel		Medium and Low Carbon Low carbon, Low alloy, Hardenability ensured steel	Mechanical components	◎
		H Steel
		AL-Cr-Mo Steel	Surface nitrided steel	Automotive and mechanical components	○
		Ni-Cr Steel	Old case haedened steel included. Better hardenability and strength than normal carbon steel. Ni additive improves hardenability and Mo additive improves tempering characteristics. Note) ◎ Able to obtain good adhesion characteristics.	Machine components such as crank shafts, gears, shafts, bolts, nuts. Note) ○ Requires sufficient attention to pre-processing.	◎
		Ni-Cr-Mo Steel			◎
		Cr Steel			◎
		Cr-Mo Steel			△
Special Purpose Steels	Tool Steel		High carbon	Tools, Spring steel	○
		Carbon Tool Steel
		Alloy Tool Steel	High carbon. For machining, for impact resistance, for abrasion deformation resistance, for hot working.	Tools, Spring steel	○
		High Speed Steel	High carbon, high alloy. Basic form is 18W-4Cr-1V.	Tools, dies, punches, rolls, bearings	○
		Heat and Corrosion Resistant Steel	Stainless steels: Ferritic, Martensitic, Austenitic, and precipitation hardening types.	Tools, bearings, cutlery, gears, razor blades, etc.	○
		Heat and Corrosion Resistant Alloy Steel	Hardly contains carbon, mainly composed of Ni. Less than 50% of Fe.	Lead frames, semiconductor systems, precision machine components, watches, valves.	◎
Cast and forging steels	Forged Steel		Medium/Low carbon	Structural material	◎
	Cast Steel		There are normal cast steel (carbon steel) and alloy cast steel. Used after homogenized annealing.	Chains, anchors	◎
Cast Iron	Gray cast iron		Also called normal cast iron. Contains 2.4-4.5% carbon.	Cylinders, liners, piston rings.	◎
	Nodular Graphite Cast Iron		Also called Ductile casting iron. Mg and etc. are added and graphite is made nodular. Has high strength.	Fittings for steel pipes, car parts Note) ×: Cannot be plated.	×
	Malleable cast iron		There are: Black heart malleable cast iron, White heart malleable cast iron, Perlite, and Cast iron, depending on applied heat treatment.	Fittings for steel pipes, car parts	◎
	Alloy cast iron		Chilled cast iron alloy, Acicular cast iron, Ni-resist cast iron	Cam shafts, dies, cylinders, etc.	◎

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