Stress Corrosion Cracking Rates in High Yield Austenitic Alloy Tubing
Cold work in austenitic alloy tubing accelerates stage II stress corrosion crack growth up to 4.5E-7 m/s when stress intensity exceeds critical thresholds.
Cold Drawing
Meaning
Metalworking processes reshape steel or other alloys by pulling them through a tapered die at temperatures below their recrystallization point. Cold drawing increases the tensile strength of the metal while providing a smooth and polished surface finish. This technique is commonly used to produce precision tubing and wire that require tight tolerances.
Tensile Enhancement
Stretching the metal through a die causes the internal grain structure to align in the direction of the flow. This change in the material properties results in a higher yield strength and a harder exterior compared to hot rolled alternatives. These improvements allow the final parts to withstand higher mechanical loads in demanding applications.
Grain Structure
Internal stresses created during the process alter the way the metal responds to future machining or welding. While cold drawing makes the material stronger, it can also make it more brittle if the reduction in area is too aggressive. Careful control of the die angle and the lubrication ensures that the metal remains workable for subsequent manufacturing steps.
Surface Quality
Removing the scale and imperfections associated with high temperature processing creates a superior exterior on the final product. A part produced through cold drawing requires less finishing work than one that was cast or hot forged. This high quality finish is often required for components that will be visible in the final assembly or that must slide against other surfaces.