Type 630, better known as 17-4, is the most common PH stainless. Type 630 is a martensitic stainless steel that offers superior corrosion resistance. It is magnetic, readily welded, and has good fabricating characteristics, though it will lose some toughness at higher temperatures. It is known for its resistance to stress-corrosion cracking, and is used in a wide variety of industries and applications including:
In order to be sold as Type 630 Stainless Steel, it must contain a unique chemical composition that includes: