440C Stainless Steel Bar
UNS S44004
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.
Industries that use 440C include:
- Machine shop
- Tool
- Utensils
Products partially or completely constructed of 440C include:
- Ball bearings
- Knives
- Mold inserts
- Nozzles
- Surgical tools
- Valves
- Wear parts of pumps
| Stocking Diameters | ½” to 16” |
|---|---|
| Material Lengths | Up to 12’ |
| Uns | Type | Ams | Astm | Federal | Characteristics |
|---|---|---|---|---|---|
| S44004 | 440C | 5618 5630 5880 |
A-276 A-314 A-493 |
QQ-S-763 | 440 A, B, and C all have the same basic composition with varying high carbon contents. This produces higher strength/hardness with 440 versions. Corrosion resistant only in the hardened condition. |
| C | MN | P | S | SI | CR | NI | MO | CU | OTHER | M/NM |
|---|---|---|---|---|---|---|---|---|---|---|
| .95 – 1.2 | 1. | .04 | .03 | 1. | 16. – 18. | .75 | .75 | .5 | M |
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