420 STAINLESS STEEL - AK Steel Holding

1 Applications PotentialAK STEEL Type 420 is a martensitic STAINLESS STEEL that provides corrosion resistance similar to Type 410 plus increased strength and hardness. It is magnetic in both the annealed and hardened conditions. Maximum corrosionresistance is attained only in the fully hardened or fully hardened and stressrelieved condition. It is seldom used in the annealed requiring good corrosion resistance and high hardness are ideal for this alloy. Typical uses include cutlery, surgical and dental instruments, scissors, tapes and straight edges. The alloy is not normally used at temperatures exceeding 800 F (427 C) due to rapid softening and loss of corrosion SHEET420 STAINLESS STEELC orrosion Resistance MagneticIncreased Strength and Hardness 420 STAINLESS STEELUNS S42000420 STAINLESS STEEL420 STAINLESS STEELPRODUCT DESCRIPTIONSPECIFICATIONSAK STEEL Type 420 STAINLESS STEEL sheet and strip is covered by the following specifications:AMS 5506 ASTM A176 AVAILABLE FORMS Type 420 STAINLESS STEEL is produced in coils and cut lengths in thicknesses in.

2 ( 35 mm) and widths up to and including 26 in. (660 mm).Values shown in this bulletin were established in customary units. The metric equivalents may be approximate. COMPOSITION(wt %)Carbon(C) (Mn) (P) (S) (Si) (Cr) PROPERTIESD ensity, (g/cm3) ( )Electrical Resistivity, in. ( cm)70 F (21 C) (55)Thermal Conductivity, F (W/m/K)212 F (100 C) ( )Coefficient of Thermal Expansion, F ( m/m/K)32 212 F (0 100 C)32 1200 F (0 649 C) x 10-6 ( ) x 10-6 ( )Modulus of Elasticity, ksi. (MPa)29 x 103 (200 x 103)Specific Heat, F (kJ/kg/K)32 212 F (0 100 C) ( )AK STEEL Corporation9227 Centre Pointe DriveWest Chester, OH | STAINLESS STEEL420 STAINLESS STEELTABLE 1 TYPICAL ANNEALED ROOM TEMPERATURE MECHANICAL PROPERTIES UTSksi.

3 (MPa) YSksi. (MPa)Elongation % in 2" ( mm)RockwellHardness85 (586) 45 (310)25B88 CORROSION RESISTANCEType 420 resists corrosion in both mild industrial and rural atmospheres, in addition to fresh water, some dilute organic acids, crude oil, gasoline, and other comparable corrosive media. Like Type 410, Type 420 should be used in the hardened or hardened and stress relieved condition in order to maximize its corrosion resistance. In the as annealed condition this grade will result in poor corrosion performance and is not annealed for maximum softness, Type 420 can be moderately drawn and martensitic class of STAINLESS steels has limited weldability due to its hardenability.

4 Special consideration is required to avoid cold cracking by preheating to 550 F (260 C). Post-weld heat treatment should be considered to achieve required properties. This particular alloy is generally considered to have poorer weldability than the most common alloy of this STAINLESS class, Type 410. A major difference is higher carbon content for this alloy which requires both preheat and post-weld heat a weld filler is needed, AWS E/ER 420, 410 NiMo and 309L are most often specified. Type 420 is well known in reference literature and more information can be obtained in this TREATMENTA nnealing: For maximum softness, heat uniformly to 1500 1650 F (816 899 C) and cool slowly in the Annealing: Heat to 1350 1450 F (732 788 C), air : Preheat, then heat to 1800 1950 F (982 1066 C), soak at temperature and air cool or quench in warm Relieving.

5 Heat at 300 800 F (149 427 C) for 1 to 3 hours, cool in air or quench in oil or STEEL is a world leader in the production of flat-rolled carbon, STAINLESS and electrical STEEL products, primarily for automotive, infrastructure and manufacturing, construction and electrical power generation and distribution markets. Headquartered in West Chester, Ohio (Greater Cincinnati), the company employs approximately 8,000 men and women at eight STEEL plants, two coke plants and two tube manufacturing plants across six states: Indiana, Kentucky, Michigan, Ohio, Pennsylvania and West Virginia. Additional information about AK STEEL is available at information and data in this document are accurate to the best of our knowledge and belief, but are intended for general information only.

6 Applications suggested for the materials are described only to help readers make their own evaluations and decisions, and are neither guarantees nor to be construed as express or implied warranties of suitability for these or other referring to material properties are the result of tests performed on specimens obtained from specific locations of the products in accordance with prescribed sampling procedures; any warranty thereof is limited to the values obtained at such locations and by such procedures. There is no warranty with respect to values of the materials at other locations. AK STEEL and the AK STEEL logo are registered trademarks of AK STEEL Corporation.

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