Martensitic stainless steel
440C / 1.4125 stainless steel
440C / 1.4125 is the hardest common martensitic stainless steel. High carbon, low toughness.
- Delivery conditions
- annealed or hardened
- Also known as
- 1.4125, X105CrMo17, AISI 440C
Designations
- W.Nr.
- 1.4125
- EN standard
- X105CrMo17
- AISI/SAE
- 440C
- UNS
- S44004
- JIS
- SUS440C
- Group
- Stainless steel
What it is used for
Bearings, balls and cutting edges.
Limits
440B or 1.4122 when the part breaks rather than wears.
Delivery
We source 440C from European mill partners as round bar, plate, flat bar, seamless tube, welded tube, cut to your dimensions and ship the certificate with the material. Typical condition: annealed or hardened. Standard: X105CrMo17. Plate is cut by laser, plasma or oxy-fuel to drawing. From a single cut piece to larger lots — with no minimum charge, so you do not have to buy a full commercial length to get what you need.
Certificates and documentation
440C can be supplied with a material certificate to EN 10204, depending on producer, dimension and the requirements specified for the delivery. On stainless, the analysis and the delivery condition are what the certificate shows. If a specific test or an ageing/hardening condition is to be documented, it must be specified before we order. EN 10204 3.1 can be supplied on a wide range of our materials.
Dimension programme
| Form | Range | Note |
|---|---|---|
| Round bar | Ø8–200 mm | Solution annealed unless otherwise stated on the PO. |
| Flat bar | Cut to order | Stainless flat. |
| Plate | 2–50 mm thickness | State thickness and finish. |
| Seamless tube | Ø13.5–Ø508 mm | DN8–DN500. Wall up to 31 mm. ASME 1/4–16″. |
| Welded tube | Ø21.3–Ø610 mm | Welded stainless. Wall to ISO 1127. State whether the weld seam must be documented. |
| Fittings | Ø12–Ø2000 mm | ASME 1/2–60″ (Ø15–Ø1524 mm). Type A and B. Not a stock statement. |
| Flanges | Ø14–Ø2000 mm | ASME 1/2–60″ (Ø15–Ø1524 mm). PN 6–400. Not a stock statement. |
The range is a delivery programme, not a stock statement. Length is cut to your drawing.
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Send your enquiry
State grade, dimensions and quantity — or attach a drawing. We reply with a quote.