OEM customized, Cut by drawings
EMERSONMETAL
| Quantity: | |
|---|---|
| Parameter | Details |
| Material Grade | 440C (UNS S44004) / 1.4125 / X105CrMo17 |
| Standards | ASTM A276, ASTM A959, EN 10088-3, JIS G4303, GB/T 1220 |
| Sheet Thickness | 0.5mm – 12mm (laser cutting); thicker plates via CNC machining |
| Max Laser Cutting Format | 4,000mm × 2,000mm |
| Laser Cutting Tolerance | ±0.05mm – ±0.10mm (annealed condition); ±0.10mm – ±0.20mm (hardened condition) |
| Surface Finish | Annealed (Pickled) / Ground / Polished / Passivated |
440C Stainless Steel Chemical compostion and technical property as below:
Standard | C % | Si max | Mn max | P max | S max | Cr | Ni max | Mo | tensile strength（MPa） | yield strength（MPa） | Elongation% |
440C | 0.95～1.2 | 1 | 1 | 0.035 | 0.03 | 16～18 | 0.6 | 0.4～0.8 | ≥760 | ≥450 | ≥14 |
Scope of application
Mainly used for manufacturing bearing parts that work in corrosive environments and non lubricated strong oxidizing atmospheres. 440C has good high-temperature dimensional stability, so it can also be used as a corrosion-resistant high-temperature bearing steel. In addition, it can also be used to manufacture high-quality cutting tools, such as medical surgical knives, scissors, nozzles, bearings, etc. 440F: It is a steel grade that improves the machinability of 440C steel, and is used for automatic lathes. Like ordinary alloy steel, it has the characteristic of hardening through quenching. Therefore, a wide range of different mechanical properties can be obtained by selecting the grade and heat treatment conditions. The ability of 440C to withstand dynamic loads is relatively low.
Q: Can 440C parts be welded during fabrication?
A: Welding 440C is generally not recommended due to its high carbon content and martensitic structure, which make it highly susceptible to cracking in the as-welded condition. If welding is absolutely necessary, it requires preheating to 250–300°C, austenitic filler metal (such as 309L), and immediate post-weld tempering. We typically recommend mechanical fastening, brazing, or designing parts for assembly without welding.
Q: What surface finish options are available for 440C parts?
A: We offer several finishes: (1) As-cut or as-ground for functional wear parts; (2) Precision ground to specific Ra values for bearing surfaces; (3) Polished to mirror finish for decorative or low-friction applications; (4) Passivated to enhance corrosion resistance by removing free iron from the surface. Note that passivation effectiveness is limited compared to austenitic grades.
Q: What is the typical lead time for custom 440C fabricated parts?
A: Prototype parts in annealed condition typically ship within 5–10 business days. Parts requiring heat treatment add 3–5 days. Complex assemblies with multiple processing stages (cutting, machining, grinding, heat treatment) typically require 15–25 days. Large production volumes may extend to 30–45 days depending on heat treatment batch scheduling.
