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For over two decades, Diaz Sheetsandplates in Manila has been a trusted partner for industries across the Philippines. We’ve built our reputation on delivering not just metal, but reliable, high-performance solutions. When you need superior strength and durability, our Stainless Steel 440C circles stand out, offering a level of quality that demanding applications require. We take pride in providing these premium materials with the expert service our customers have come to expect.
The 440C grade is a high-carbon martensitic stainless steel, primarily composed of chromium for corrosion resistance. Its defining feature is the ability to achieve a high degree of hardness, typically reaching up to 60 HRC after heat treatment. This results in excellent wear resistance and an ability to hold a keen edge. While its toughness is somewhat balanced, its strength and resistance to abrasion make it a go-to for high-stress components.
| Specifications : | ASTM A276 |
| Dimensions : | ASTM, ASME and API |
| Standard : | JIS, AISI, ASTM, GB, DIN, EN, etc. |
| Surface : | 2B, 2D, BA, NO.4, NO.8, 8K, Mirror,Checkered, Embossed, Hair Line, Sand Blast, Brush, Etching |
| Width : | 1000mm, 1219mm, 1500mm, 1800mm, 2000mm, 2500mm, 3000mm, 3500mm,etc. |
| Finish : | Black,Bright Polished,Rough Turned,No.4 Finish,Matt Finish,BA Finish |
| Length : | 2000mm, 2440mm, 3000mm, 5800mm, 6000mm, etc. |
| Grade | C | Mn | Si | P | S | Cr | Mo | Ni | N | |
| 440C | min. max. | 0.95 1.20 | – 1 | – 1 | – 0.04 | – 0.030 | 16.00 18.00 | – 0.75 | – | – |
| Tempering Temperature (°C) | Tensile Strength (MPa) | Yield Strength 0.2% Proof (MPa) | Elongation (% in 50mm) | Hardness Rockwell (HR C) | Impact Charpy V (J) |
| Annealed* | 758 | 448 | 14 | 269HB max# | – |
| 204 | 2030 | 1900 | 4 | 59 | 9 |
| 260 | 1960 | 1830 | 4 | 57 | 9 |
| 316 | 1860 | 1740 | 4 | 56 | 9 |
| 371 | 1790 | 1660 | 4 | 56 | 9 |
| Grade | WERKSTOFF NR. | UNS |
| SS 440C | 1.4313 | S44004 |
We provide products that come with both mill test certificates and third-party test certificates, ensuring the highest standards of quality and compliance.
Stainless Steel 440C Circle offer several advantages including high hardness and good corrosion resistance, making them ideal for applications requiring toughness, such as bearings and cutting tools especially on sites flexible It has good corrosion resistance and can withstand higher temperatures than other stainless steels. The ability to retain strength and hardness at elevated temperatures makes it highly suitable in complex industrial applications. Moreover, it is easily polished, making it flexible for cosmetic and functional purposes in industries such as automotive, aerospace and space.
You’ll find these robust circles in critical roles where failure is not an option. They are perfectly suited for manufacturing high-quality ball bearings and precision gauges that must resist constant friction. Many also choose them for high-quality cutting tools, including surgical blades and food processing equipment, where sharpness and durability are paramount. In fact, any application demanding a hard, non-corrosive surface will benefit from the reliable performance of a 440C circle.
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