Yes. Marlin Steel can use nitrogen (at a 20 percent slower rate than stainless steel). However, it creates micro-cracking in the material. Depending on the client’s tolerances/specs, argon gas may be required to cut parts without micro-cracking in the material.
Open area in perforated metal is the percentage of area that allows for the passage of air, light, liquid or solids. It is the characteristic that distinguishes perforated metals from solid metals and it is most sought in applications that involve fluid flow, pressure drop, heat dissipation, acoustical absorption and reduction in weight.
The large number of perforating patterns with round holes, squares, slots and other shapes makes it all but impossible to list every combination, says the Industrial Perforators Association. The following general guidelines come from the association, which was formed a half-century ago to increase the market for perforated materials in North America.
The removal of material to create open area reduces the strength and rigidity of the original sheet. The perforating process, meanwhile, hardens the material that remains. But extreme open area proportions increase distortion; staying under 70 percent is best. More information can be found in the IPA handbook.
When we heard the news that President Obama is expected today to name his replacement for U.S. Treasury Secretary Timothy F. Geithner, we recalled the day last spring when Mr. Geithner visited our factory in Baltimore. He was pleased that we were growing in a bad economy and exporting to 36 nations in contrast to the grim picture of American manufacturing losing out to cut-rate competitors overseas. But he got particularly enthused when Dr. Marshal “Mickey” Greenblatt, a member of the board of directors at Marlin Steel, showed him the powerful sheet-metal laser cutter that Marlin had recently purchased.
“He was fairly cool and collected, but he became very animated when I described how a change in the depreciation rule allowed us to quickly invest in the new robot equipment. The change reduced the depreciation period on the purchase from five years to one so our tax bill went down. That probably enabled us to hire three workers, I told him. He jumped up on the balls of his feet very excitedly and said, ‘That was my idea. That was my idea.’”