OSTP ULTRAGREEN™ Calculate Your Carbon Saving Enter your project details below to see how much CO₂e you could save by switching to OSTP UltraGreen™ Stainless Steel. Lower Carbon Stainless Steel Lower Carbon Stainless Steel Lower Carbon Stainless Steel SAME STAINLESS. LOWER CARBON. R SAME GRADES R SAME STANDARDS R SAME FABRICTION R SAME WELDABILITY R SAME CORROSION RESISTANCE R LOWER PCF