SP 400™ Corrosion Inhibitor, 10 oz Fill Amount, Aerosol Can Oilfield Equipment and 347 stainless steels Controlled ferrite and 347 stainless steels Controlled ferrite in the weld deposit gives excellent notch toughness at cryogenic temperatures Deposits a max of 4% carbon in the weld metal to minimize the formation of chromium carbides and consequent susceptibility to intergranular corrosion Used on food and pharmaceutical equipment Waterproof waxy film is highly resistant to humidity and salt spray and never becomes brittle Long term protection (up to 2 years outdoors) for all metals during shipment or extended storage Waxy film seals out moisture completely