440F stainless steel is a high-carbon martensitic stainless steel meant to provide improved machinability and corrosion resistance. An excellent choice for applications where good hardness, wear resistance, and moderate corrosion resistance are required. 440F has a very high sulfur content which aids in machinability, therefore, it is useful for precision machining and automated work processes, and has better machinability than other steels in the 440 series.
| execution standard | ZEICIN Grade | GB | ASTM | JIS | DIN |
| GB | SUS440F | Y108Cr17（Y11Cr17） | S44020/440F | SUS440F | 1.4025 |
| C | Cr | Mn | Si | Mo | V |
| 0.95~1.20 | 16.00~18.00 | ≤1.25 | ≤1.00 | ≤0.75 | – |
| Co | S | P | Ni | Nb | W |
| — | ≥0.15 | ≤0.06 | ≤0.60 | – | – |
We are proud to be a participant in the National Key Research and Development Plan of the 13th Five-Year Plan, focusing on “High-Performance Die Steel and Its Application.” Our involvement in this prestigious program reflects our commitment to innovation and excellence.
We took advanced technology specially developed with Shanghai University and Beijing Iron and Steel Research Institute in the production of stainless steel. This combination provides for high hardness, wear resistance and superior machinability. Combined with our proprietary heat treatment and forging processes, 440F stainless steel becomes finely suited for precision applications.
We maintain a robust supply chain to ensure the consistent availability of high-performance stainless steel materials like 440F. Our products are available in both standard and custom sizes, catering to various industrial needs.
440F stainless steel is at least equal to or more superior than the performance of European, American, and Japanese brands. Each batch is thoroughly quality-tested to ensure the utmost reliability and performance.
Our 440F stainless steel has a higher cost-performance ratio than many international suppliers, so our customers always get high cost-performance.
A smooth production cycle allows the flexibility for regular and express orders. Typical lead time is about 40 days, so you are covered.
440F stainless steel boasts dimensional stability and toughness that are above other top-tier stainless steels at a significant cost savings for the customer.
| Heat Treatment | Temperature | Procedure | Effect |
| Annealing | 843~871℃ | Soak at this temperature, furnace cool | Reduces hardness, improves machinability |
| Tempering | 179~177℃ | Soak for 1 hour this temperature | Achieves minimumu hardness of Rc 56 |
| Hardening | 1010~1066℃ | Soak at this temperature, air cool or warm oil quench | Increases hardness and strength enhances wear resistance |
Top Machinability: The increased sulfur content improves machinability and makes it ideal for machining complex components.
Steady Hardness: Provides uniform hardness via heat treatment in controlled conditions to meet stringent industrial requirements.
Enhanced Wear Resistance: Offers outstanding durability, particularly for high-friction and abrasive conditions.
Good Corrosion Resistance: Effective up to a point in mildly corrosive environments, like indoor or dry applications.
440F stainless steel’s free-machining qualities and fine surface finish make it ideal for a variety of applications:
Parts that require tight tolerances and polished surfaces.
Medical Equipment：
Precision surgical tools and dental instruments that require high machinability and smooth finishes.
Precision components requiring high strength and ease of machining.
Shafts and fittings which need incredible machining accuracy.
Pump drills, taps, and dies where enhanced toughness is needed.
They’re similar, the difference is sulfur content. 440F is optimized for machinability without a significant loss in the mechanical and corrosion resistance properties. It is better than 440A, 440B, and 440C due to its suitability for precise machining applications.
Is it have any different than other martensitic stainless steels including 440F?
While other types of martensitic stainless steels (such as 440C), have favorable machining properties but are ideal for use in automated production. Its anti-corrosion ability is as good as 440C, but in cutting efficiency it has more advantage.
What dimensions and shapes does 440F come in?
We offer 440F stainless steel in both standard and custom sizes, catering to a wide range of applications. Contact our team to discuss your specific requirements.
Excellent materials: We use strict process control to ensure that each batch of 440F stainless steel has stable quality and excellent performance.
Tailored Services: Tailormade size, hardiness and compounds adjustment according to individual customers demand.
Process finished and semi-finished products: In addition to raw materials, we also deliver finished and semi-finished products
How to order or get in touch for more details?
To ask about pricing, availability, or technical details:
