Stainless Steel 420F is stocked by 7 North American distributors and produced by 11 large mills. Distributors will offer small quantity buys while mills will generally only sell large quantities, with delivery times anywhere from 10 to 50 weeks depending on size and form required
This material is stocked primarily in Bar Products by 5 distributors but is also available to a lesser extent in Wire Products, Casting Products, Forging Products, and Tubular Products.
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Specifications
The following specifications cover Stainless Steel 420F
- AISI 420F
- AMS 5620
- ASTM A895
- UNS S42020
Property Results
Related Metals:
Chemistry Data : [top]
Carbon
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0.15 min |
Chromium
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12 - 14 |
Iron
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Balance |
Manganese
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1.25 max |
Molybdenum
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0.6 max |
Phosphorus
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0.06 max |
Silicon
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1 max |
Sulphur
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0.15 min |
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Principal Design Features
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This alloy is a general purpose free machining version of 420 stainless, a heat treatable chromium steel.
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Applications
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Dental and surgical instruments, cutlery, pump shafts, gears pinions and cams, steel balls, and various hand tools. Not recommended for vessels containing high pressure gases or liquids or for plastic molds where high surface finishes are required.
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Machinability
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Good machining characteristics due to the addition of sulfur. High speeds and feeds combined with short brittle chips.
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Welding
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Not commonly welded due to its air hardening characteristics. Welding may be performed after preheating to 300-400 F (149-204 C) with post weld tempering at temperature for 2 hours . Filler metal should be AWS E/ER420.
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Hot Working
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Bring temperatures slowly up to 1400 F (760 C), then on to 2000-2200 F (1097-1204 C), after working, furnace cool slowly to avoid cracking. Reheat often to keep the working temperature above 1600 F.
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Cold Working
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420F will withstand only minor cold work. Radical forming operations will result in cracking.
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Annealing
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1550-1650 F (843-900 C), slow furnace cooling.
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Tempering
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300-400 F (149-204 C), air cool for maximum hardness (Rc 52) and corrosion resistance.
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Hardening
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Soak at 1850-1950 F (1010-1066 C) at quench in heated oil.
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Physical Data : [top]
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Density (lb / cu. in.)
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0.28
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Specific Gravity
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7.7
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Specific Heat (Btu/lb/Deg F - [32-212 Deg F])
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0.11
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Electrical Resistivity (microhm-cm (at 68 Deg F))
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330
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Melting Point (Deg F)
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2650
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Modulus of Elasticity Tension
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29
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Mechanical Data : [top]
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MSO currently has no data available for this grade.
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Videos :
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MSO currently has no videos available for this grade.
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