Stainless Steel Alloy 630

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:

  • Valves and gears
  • Oil field equipment
  • Propeller shafts
  • Pump shafts
  • Valve spindles
  • Aircraft and gas turbines
  • Nuclear reactors
  • Paper mills
  • Chemical processing equipment

In order to be sold as Type 630 Stainless Steel, it must contain a unique chemical composition that includes:

  • Cr 15-17.5%
  • Ni 3-5%
  • Mn 1%
  • Si 1%
  • P 0.040%
  • S 0.03%
  • Cu 3-5%
  • Nb+Ta 0.15-0.45%

Continental Steel offers Type 630 Stainless Steel in a number of shapes and sizes including round bar. Like all of the products sold by Continental Steel, our Type 630 Stainless Steel meets critical industry standards like ASTM A564.

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