What are the different types of 440 stainless steel?
Type 440 Stainless Steel, which comes in four different grades, 440A, 440B, 440C, and 440F, offers good corrosion resistance along with abrasion resistance. All grades can be easily machined in their annealed state, they also offer resistance to mild acids, alkalis, foods, fresh water, and air.
What is 440B stainless steel?
440B is a high-carbon martensitic stainless steel that is heat-treated to achieve high hardness (around 58 HRC), excellent wear resistance, and moderate corrosion resistance. Due to its properties, it is commonly used for applications like cutlery, surgical tools, and industrial cutting tools.
What is 440c stainless steel?
440C is a high-carbon martensitic stainless steel known for its high hardness, strength, and wear resistance. It has a high chromium content (16-18%) and a carbon content between 0.95% and 1.20%, which allows it to be hardened to a high degree through heat treatment. These properties make it a popular choice for applications like high-end cutlery, bearings, and surgical instruments.
Equivalent grades of 440 SS
|
American |
ASTM |
440A |
440B |
440C |
440F |
|
UNS |
S44002 |
S44003 |
S44004 |
S44020 |
|
|
Japanese |
JIS |
SUS 440A |
SUS 440B |
SUS 440C |
SUS 440F |
|
German |
DIN |
1.4109 |
1.4122 |
1.4125 |
/ |
|
China |
GB |
7Cr17 |
8Cr17 |
11Cr17 9Cr18Mo |
Y11Cr1 |
Chemical composition of 440 SS
|
Grades |
C |
Si |
Mn |
P |
S |
Cr |
Mo |
Cu |
Ni |
|
440A |
0.6-0.75 |
≤1.00 |
≤1.00 |
≤0.04 |
≤0.03 |
16.0-18.0 |
≤0.75 |
(≤0.5) |
(≤0.5) |
|
440B |
0.75-0.95 |
≤1.00 |
≤1.00 |
≤0.04 |
≤0.03 |
16.0-18.0 |
≤0.75 |
(≤0.5) |
(≤0.5) |
|
440C |
0.95-1.2 |
≤1.00 |
≤1.00 |
≤0.04 |
≤0.03 |
16.0-18.0 |
≤0.75 |
(≤0.5) |
(≤0.5) |
|
440F |
0.95-1.2 |
≤1.00 |
≤1.25 |
≤0.06 |
≥0.15 |
16.0-18.0 |
/ |
(≤0.6) |
(≤0.5) |
Note: the values in brackets are allowed and not mandatory.
Hardness of 440 SS
| Grades | Hardness, Annealing(HB) | Heat treatment(HRC) |
| 440A | ≤255 | ≥54 |
| 440B | ≤255 | ≥56 |
| 440C | ≤269 | ≥58 |
| 440F | ≤269 | ≥58 |
What is the difference between 440A and 440C stainless steel?
The main differences are that 440C has higher carbon content for greater hardness, wear resistance, and edge retention, while 440A has lower carbon content, making it tougher, more corrosion-resistant, and easier to sharpen.
ASTM Specifications
| Grade | Pipe / Tube (SMLS) | Bar | Forging | Wire |
| 440A | A 511 | A 276, A 314 | A 473 | A 580 |
| 440B | - | A 276, A 314 | A 473 | A 580 |
| 440C | - | A 276, A 314 | A 473 | A 493 |
If you have any project needs for 440B or 440C stainless steel bars, please feel free to place an order. GNEE has a large inventory of popular products for your selection. They can be processed into various practical product forms, including plates, coils, tubes, bars, and wires. For detailed chemical composition and free samples, please contact our factory immediately. We offer competitive prices and excellent service.
