AISI 440B 440 B SUS440B X90CrMoV18 1.4112 UNS S44003 Forged Forging Steel Round Bars Hollow Bars Shafts Square rectangular rectangle Blocks Discs Disks Plates Flat Bars
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We are professional AISI 440B 440 B SUS440B X90CrMoV18 1.4112 UNS S44003 Forged Forging Steel Round Bars Hollow Bars Shafts Square rectangular rectangle Blocks Discs Disks Plates Flat Bars from china
| Principal Design Features |  | 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 | | Ball bearings and races, gage blocks, molds and dies, cutlery, valve components, knives and measuring instruments. |
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| Machinability | | 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 | | 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 | | 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 | | This alloy is considered only slightly cold workable by common practices. |
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| Annealing | | 1550-1600 F (843-871 C), followed by very slow furnace cooling. |
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| Tempering | | For maximum properties, soak at 300 F (148 C). Maximum obtainable hardness is RC 58. |
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| Hardening | | 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. |
