High hardness & strength for demanding applications
Multiple martensitic & ferritic grades available
ASTM / AISI compliant, custom sizes supported
400 Series Stainless Steel Bars and Rods including grades 431, 446, 440A, 440B, and 440C are widely used for applications requiring high hardness, strength, and wear resistance. Voyage Metal supplies a full range of martensitic and ferritic stainless steel bars manufactured under strict quality control and international standards.
Compared with 300 series stainless steel, 400 series stainless steel offers higher hardness and mechanical strength. These grades are commonly produced through cold drawing or precision rolling, requiring specialized processing technology and longer production cycles to ensure dimensional accuracy and performance stability.
| Standard | AISI, ASTM, DIN, EN, GB, JIS |
|---|---|
| ASTM Specification | ASTM A268 / ASTM A276 |
| Production Process | Cold Drawing, Precision Rolling |
| Item | Range |
|---|---|
| Diameter | 6 – 720 mm (1/8” – 36”) |
| Length | 1 – 14 meters or customized |
| Surface Finish | Black, Peeled, Polished, Turned |
| Grade | C (%) | Cr (%) | Ni (%) |
|---|---|---|---|
| 431 | 0.11 – 0.17 | 16.00 – 18.00 | 1.50 – 2.50 |
| 440A | 0.60 – 0.75 | 16.00 – 18.00 | - |
| 440B | 0.75 – 0.95 | 16.00 – 18.00 | - |
| 440C | 0.95 – 1.20 | 16.00 – 18.00 | - |
| 446 | ≤0.12 | 23.00 – 27.00 | - |
| Industry | Typical Use |
|---|---|
| Petrochemical | Pumps, valves, shafts, fasteners |
| Oil & Gas | Downhole tools, mechanical components |
| Marine | Seawater-resistant parts, fittings |
| Food Processing | Cutting tools, wear-resistant components |
| Energy & Environment | High-temperature and corrosion-resistant parts |
The main difference lies in carbon content. 440C has the highest carbon content, providing the highest hardness and wear resistance, while 440A offers better corrosion resistance.
Yes. Voyage Metal supports customized diameters, lengths, and surface finishes based on your drawings or technical requirements.
Due to specialized processing requirements, the typical production cycle for 400 series stainless steel bars is around 30–35 days, depending on size and quantity.
Please contact us at www.voyagemetal.com or email [email protected] with your required grade, size, and quantity.
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