ASTM 440C steel is a high carbon chromium stainless steel providing stainless steel properties with optimum hardness after heat treatment. ASTM 440C can achieve a hardness of up to 60 Rockwell HRc. ASTM 440C stainless resists corrosion in normal domestic environments and very mild industrial enviroments, with optimum cossision resistance of 440C achieved with a temper below about 400°C. For 440C to achieve best cossosion resistance, surfaces must be free of scale, lubricants, foreign particles, and coatings applied for drawing and heading. With its high carbon content 440C annealed stainless machines similar to a high speed steel annealed grade.
Composition ranges for 440 grade stainless steels.
| Grade | C | Mn | Si | P | S | Cr | Mo | Ni | N | |
| 440C | min. max. | 0.95 1.20 | - 1.00 | - 1.00 | - 0.040 | - 0.030 | 16.00 18.00 | - 0.75 | - | - |
Mechanical properties of 440C grade stainless steels.
| 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 |
Bebon International is a professional ASTM 440C stainless steel exporter and a steel Stockist in china. Any need in ASTM 440C stainless steel Chemical Composition ，Mechanical Properties and price , please feel free to contact us by email or calling to us.
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