Raw Material Alloy 440C UNS S44000 DIN1.4125 SUS 440C Black Polished 25mm Stainless Steel Round Bar
Stainless steels are high-alloy steels which have high corrosion resistance compared to other steels due to the presence of large amounts of chromium. Based on their crystalline structure, they are divided into three types such as ferritic, austenitic, and martensitic steels. Another group of stainless steels are precipitation-hardened steels. They are a combination of martensitic and austenitic steels.
Grade 440C stainless steel is a high carbon martensitic stainless steel. It has high strength, moderate corrosion resistance, and good hardness and wear resistance. Grade 440C is capable of attaining, after heat treatment, the highest strength, hardness and wear resistance of all the stainless alloys. Its very high carbon content is responsible for these characteristics, which make 440C particularly suited to such applications as ball bearings and valve parts.
APPLICATIONS
Typical applications include:
- Rolling element bearings
- Valve seats
- High quality knife blades
- Surgical instruments
- Chisels
SPECIFICATIONS
UNS: ASTM/ASTE S44000
DIN: 1.4125
| Name |
stainless steel round bar |
material |
440C |
| OD size |
10-250mm |
Length |
6m |
| surface |
polished / black |
standard |
ASTM A276 |
AISI 440C is a high-carbon chromium steel designed to provide stainless properties with maximum hardness. It has been used primarily as a bearing steel, and is used in the hardened plus tempered condition. When heat-treated, Type 440C attains the highest hardness of any stainless steel (about Rockwell C 60).
Typical applications are bearing assemblies, including bearing balls and races. In addition, it should be considered for cutlery, needle valves, ball check valves, valve seats, pump parts, ball studs, bushings, and wear-resistant textile component
Supply Range for 440C Stainless Steel
440C steel round bar: diameter 1mm～400mm
440C stainless plate: 0.1-100 thickness x 500-2000mm width x 1000-6000mm length
Other steel shape, like 440c steel sheet, 440C coil, flat bar and customized sizes are available against request
- Standard of 440C Stainless Steel and Equivalent Steel Grades
| Country |
USA |
BS & DIN |
Japan |
| Standard |
ASTM A276 |
EN 10088 |
JIS G4303 |
| Grades |
S44004/440C |
X105CrMo17/1.4125 |
SUS440C |
- ASTM A276 440C Steel Chemical Composition and Equivalent’s
| Standard |
Grade |
C |
Mn |
P |
S |
Si |
Cr |
Mo |
| ASTM A276 |
S44004/440C |
0.95-1.20 |
≦1.00 |
≦0.04 |
≦0.03 |
≦1.00 |
16.0-18.0 |
≦0.75 |
| EN10088 |
X105CrMo17/1.4125 |
0.95-1.20 |
≦1.00 |
≦0.04 |
≦0.03 |
≦1.00 |
16.0-18.0 |
0.40-0.80 |
| JIS G4303 |
SUS 440C |
0.95-1.20 |
≦1.00 |
≦0.04 |
≦0.03 |
≦1.00 |
16.0-18.0 |
≦0.75 |
- ASTM 440C Stainless Steel Mechanical Properties
| Tempering Temperature (°C) |
Tensile Strength (MPa) |
Yield Strength 0.2% Proof (MPa) |
Elongation (% in 50mm) |
Hardness Rockwell (HRC) |
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 |
Density (kg/m3) |
Elastic Modulus (GPa) |
Mean Coefficient of Thermal Expansion (mm/m/°C) |
Thermal Conductivity(W/m.K) |
Specific Heat |
Electrical Resistivity (nW.m) |
| 0-100°C |
0-200°C |
0-600°C |
at 100°C |
at 500°C |
0-100°C (J/kg.K) |
| 440 C |
7650 |
200 |
10.1 |
10.3 |
11.7 |
24.2 |
– |
460 |
600 |
- Forging of 440C Stainless Steel
Preheat to 760oC – 820oC, then heat slowly and uniformly to 1050oC – 1150oC, hold until temperature is uniform throughout the 440c steel section and commence forging immediately. Do not overheat 440c stainless steel as this can cause a loss of toughness and ductility. Do not forge below 900oC. Finished forgings of SS 440c should be cooled slowly in a furnace, warm dry lime or ashes to room temperature and annealed immediately. Air cooling after forging may cause cracking of steel 440c.
- Machinability of 440C Steel
ASTM Grade 440C stainless steel can be machined well, with all operations such as turning and drilling etc., in the annealed condition. Because of 440C SS high carbon content it machines somewhat like high-speed steel. Because chips are tough and stringy, chip curlers and breakers are important.
As heat treated, the 440 steel series are difficult to machine because of their high hardness. For parts that require extensive machining, the free-machining versions, Type 440F or Type 440F Se, offer improved machining properties.
Q1: Do you accept the trial order ?
A1: Yes,if we have the exactly size in stock.we can delivery even 1 piece/meter .
Q2: Can I have free sample before making orders?
A2: Yes,we can supply free sample as requirement,but buyer needs to pay the freight charges ,the freight fee will return to buyer after making order.
Q3: How do you control the quality ?
A3: MTC and PMI will be sent before shipment,any 3rd party inspection if need .
Q4: How about your delivery time ?
A4: Generally delivery time is 15 working days .
Q5: How can I quickly get the price list ?
A5: Directly click "chat now" or send us email with detail specifications,you will get the official price list in 1 hour .
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