What is 440B stainless steel round bar?
440B Stainless Steel Round Bar is a high-carbon, martensitic steel bar known for its exceptional hardness, strength, and wear resistance, all achieved through heat treatment. It offers moderate corrosion resistance and is used in cutting tools, surgical instruments, bearings, and other industrial components requiring high durability.
What is 440C stainless steel bar?
440C stainless steel bar is a high-carbon, martensitic stainless steel bar that, after heat treatment, exhibits high strength, hardness, and wear resistance, making it suitable for applications such as bearings, surgical instruments, and high-end cutting tools. While it exhibits good corrosion resistance in the hardened state, its wear resistance and hardness stem from its high carbon content, which is higher than other stainless steels.
Chemical Composition :
| Grade | C | Mn | Si | P | S | Cr | Ni |
|---|---|---|---|---|---|---|---|
| 440A | 0.6 - 0.75 | 1.00 max | 1.00 max | 0.04 max | 0.030 max | 16.00 - 18.00 | - |
| 440B | 0.6 - 0.75 | 1.00 max | 1.00 max | 0.04 max | 0.030 max | 16.00 - 18.00 | - |
| 440C | 0.95 - 1.20 | 1.00 max | 1.00 max | 0.040 max | 0.030 max | 16.00 - 18.00 | - |
Mechanical Properties of SS 440 A, B & C :
| 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 |
| * Annealed properties are typical for Condition A of ASTM A276# Brinell Hardness is ASTM A276 specified maximum for annealed 440A, B and C. | |||||
Mechanical Properties of SS 440 :
| Tensile Strength | Yield Strength (0.2%Offset) | Elongation |
|---|---|---|
| Psi – 75,000 , MPa – 485 | Psi – 40,000 , MPa – 275 | 20 % |
440B vs. 440C SS Bar: Hardness
440C stainless steel can achieve higher hardness than 440B, reaching a typical Rockwell C hardness of 58-62 after heat treatment, whereas 440B reaches a lower maximum hardness, such as around 54 HRC in some conditions, due to its lower carbon content. This difference is because 440C has a higher carbon content, allowing it to attain the highest strength, hardness, and wear resistance among the 440 series.
Which is better for knives, 440B or 440C stainless steel bar?
For knife manufacturing, 440C is generally considered superior to 440B, offering greater hardness and edge retention. While both are suitable for knife making, 440C's higher carbon content provides greater hardness and wear resistance, making it an ideal choice for high-quality knives.
who choose us?
GNEE offers high-quality 440B stainless steel in a variety of product forms at wholesale prices. As a purchasing manager, you can find the best deals for your industry's needs. We offer a wide range of stainless steel plate grades to meet your needs. You can trust us for reliable supply and cost-effective solutions. Email:
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