440A, 440B, 440C, 440F, 440F Se HARDENABLE CHROMIUM STAINLESS STEEL

Description

Stainless steel 440C, also known as UNS S44004, principal elements are .95% to 1.2% carbon, 16% to 18% chromium, .75% nickel, with traces of manganese, silicon, copper, molybdenum, phosphorus and sulfur. Grade 440C is a high carbon martensitic stainless with moderate corrosion resistance good strength, and the ability to obtain and hold excellent hardness (Rc 60) and wear resistance. It is considered to be slightly cold workable by common practices and does respond to heat treatment.

Grades 440A and 440B are identical except for slightly lower carbon contents (0.60 - 0.75% and 0.75 - 0.95% respectively); these have lower attainable hardnesses but slightly higher corrosion resistances. Although all three versions of this grade are standard grades, in practice 440C is more available than the A or B variants.

A free-machining variant 440F (UNS S44020) also exists, with the same high carbon content as 440C.

Applications

Ball bearings, Knives, Mold, inserts, Nozzles, Surgical, tools, Valves, Wear parts of pumps

Specifications

UNS# S44002 440A, SAE 51440A HARDENABLE Cr STAINLESS
UNS# S44003 440B, SAE 51440B HARDENABLE Cr STAINLESS
UNS# S44004 440C, SAE 51440C HARDENABLE Cr STAINLESS
UNS# S44020 440F, SAE 51440F MARTENSITIC Cr FREE MACHINING STAINLESS
UNS# S44023 440F Se, SAE 51440F Se MARTENSITIC CrSe SELENIUM BEARING FREE MACHINING STAINLESS

AMS 5631C 440A BARS & FORGINGS
AMS 58990 440C BARS & WIRE & FORGINGS
AMS 5618D 440C BARS,WIRE & FORGINGS
AMS 5630G 440C BARS, WIRE & FORGINGS
AMS 5632F 440A, 440F, 440F Se BARS AND FORGINGS
AMS 5880A 440C BARS, WIRE & FORGINGS
AMS 7445C 440A, 440B, 440C BALLS
ASTM A-276 BARS & SHAPES
ASTM A-314 BILLETS & BARS FOR FORGINGS
ASTM A-473 FORGINGS
ASTM A-493 WIRE & WIRE RODS FOR COLD HEADING & COLD FORGING
ASTM A-511 SEAMLESS MECHANICAL TUBING
ASTM A-580 WIRE
DOD-F-224669 FORGING & FORGE STOCK, STEEL BARS & BILLET FOR REFORGING
QQ-S-763 STEEL BARS, WIRE, SHAPES & FORGINGS
QQ-S-764 FREE MACHINING BAR, SQUARE, HEX, OCTAGON, FLAT
SAE J405 CHEMICAL COMPOSITIONS OF SAE WROUGHT STAINLESS STEELS
SAE J412 GENERAL CHARACTERISTICS & HEAT TREATMENTS OF STEELS

Available Forms

• Bar
• Centrifugal Castings
• Forge
• Hex Bar
• Plate
• Sheet
• Square Bar
• Wire