Stainless Steel 440 B is stocked by 9 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 Flat Rolled Products by 4 distributors but is also available to a lesser extent in Wire Products, Bar Products, Forging Products, and Tubular Products.
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Specifications
The following specifications cover Stainless Steel 440 B
- AISI 440B
- ASTM A276
- ASTM A314
- ASTM A473
- ASTM A580
- DIN 1.4112
- QQ S763
- UNS S44003
Property Results
Chemistry Data : [top]
Carbon
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0.75 - 0.95 |
Chromium
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16 - 18 |
Iron
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Balance |
Manganese
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1 max |
Molybdenum
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0.75 max |
Phosphorus
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0.04 max |
Silicon
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1 max |
Sulphur
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0.03 max |
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Principal Design Features
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This is a high carbon martensitic stainless with moderate corrosion resistance good strength and the ability to obtain and keep excellent hardness (Rc 58) and wear resistance.
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Applications
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Ball bearings and races, gage blocks, molds and dies, cutlery, valve components, knives and measuring instruments.
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Machinability
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Best machined in the annealed condition. Tough, stringy chips can be best handled by the use of chip breakers. Carbide or ceramic tooling is recommended.
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Welding
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This alloy is not commonly welded due to its tendency to air harden. If it must be welded, preheat to 500 F (260 C) and post weld treat at 1350-1400 F (732-760 C) for 6 hours followed by a slow furnace cooling to avoid cracking. Use similar filler metal and high heat inputs during operations.
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Hot Working
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Pre-heat to 1400 F (760 C), then bring slowly up to 1900-2200 F (1038-1204 C)before proceeding. Do not work this material below 1700 F (927 C). Cool material slowly after working and once at room temperature, anneal fully.
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Cold Working
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This alloy is considered only slightly cold workable by common practices.
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Annealing
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1550-1600 F (843-871 C), followed by very slow furnace cooling.
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Tempering
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For maximum properties, soak at 300 F (148 C). Maximum obtainable hardness is RC 58.
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Hardening
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Bring the material slowly up to 1400 F (760 C), then on to a soak temperature of 1850 F (1010 C), air or oil cool.
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Physical Data : [top]
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Density (lb / cu. in.)
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0.277
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Specific Gravity
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7.65
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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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360
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Melting Point (Deg F)
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2700
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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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Disclaimer
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