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UNS S42000 Stainless Steel Martensitic Grades

What is S42000 Steels? This grade of steel is a martensitic stainless steel. S42000 is a material grade and designation defined in UNS ASTM A480 standard. As a chromium carbon steel it can be enumerated in martensitic stainless steel.

What is ASTM A480? ASTM A480 is an American material standard for general Requirements for Flat-Rolled Stainless and Heat-Resisting Steel Plate, Sheet, and Strip.

Why S42000 called Alloy 420 Stainless Steel? When a material grade is specified as stainless steel, it means it has chromium content in it. S42000 is the UNS designation alloy, also referred as 420 alloy and is defined in ASTM A480 standard.

S42000 material can be hardened and is a martensitic stainless steel. This material type contains at least 12% chromium, just adequate to offer excellent corrosion resistant properties. Alloy 420 has more carbon content than sister alloy 410 which is made to enhance strength and hardness properties. It can attain robust ductility whenever annealed but can be manipulated to a high Rockwell hardness up to 50 HRC.

Available Forms in Market: Following are the available forms of S42000 steels in the global market:

  • Stainless Steel Coils
  • Sheets
  • Plates
  • Round bars

Dimensional Characteristics of S42000 Steels: The applicable thickness for this S42000 material as obtained by data in the market starts from 0.38 mm to 35 mm. However the width of this material ranges to 660 mm and over.

The Chemical Composition of S42000 Steels:  The chemical composition of this grade is as under:

  • Maximum percentage of Carbon (C) is 0.15 percent.
  • Maximum percentage of Manganese (Mn) is 1.25 percent.
  • Maximum percentage of Phosphorous (P) is 0.04 percent.
  • Maximum percentage of Sulphur (S) is 0.03 percent.
  • Minimum percentage of Chromium is 12.0 percent and maximum is 14.0 percent.
  • Maximum percentage of Silicon (Si) is 1 percent.

Remaining is iron (Fe) percentage and with few negligible impurities.

Mechanical Properties of S42000 Steels: Following are some of the mechanical properties of 420 steels:

  • The tensile strength of the 420 alloy steel is expressed in Newton per millimeters and it must be at-least 655 N/mm2 (MPa) to 1035 N/mm2 (MPa).
  • The elongation property of S42000 steel varies with the heat treatment process.
  • The minimum percentage ranges for elongation is from 10 to 25 percent.
  • S42000 because of its hardening properties is not mostly welded, although it is possible.
  • Martensitic stainless steels are made for high hardness and at times different properties are to extend bargained.
  • Corrosion resistance is lesser than the other known austenitic grades and their excellent operating range is limited by their depletion of ductility at sub-zero temperatures and loss of strength by process of tempering at high temperatures.
  • Its robust corrosion resistance is attained when the metal is hardened and surface is polished.

Equivalent Material Grades in Other International Standards: Read more about the

  • Equivalent grade of this type in ASTM is 420 Martensitic Wrought Stainless Steel Sheet.
  • In JIS standard, the corresponding material is referred as 420J1 type steel.
  • In DIN standard, the corresponding material is referred as 1.4021 type steel.
  • In ISO standard, the corresponding material is referred as 420A type steel.

Applications of S42000 Stainless Steels: Applications are as under

  • Knife Blades
  • Shear blades
  • Needle valves
  • Surgical Instruments
  • Cutlery
  • Shearing devices

Suppliers of S42000 Steel: Suppliers are also listed below:

Supplier AK Steel Corporation bearing contact number 800-331-5050.The supplier address is 9227 Centre Pointe Drive, West Chester, OH 45069

Supplier Ulbrich Stainless Steels & Special Metals, Inc. bearing contact number 203-239-4481.The supplier address is 153 Washington Ave. North Haven, CT 06473



Waqas Imam is an Industrial Engineer, Certified Lead Auditor, Material Consultant and Blog Writer.

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