TSING SHAN STEEL INDUSTRIAL LIMITED
TSING SHAN STEEL INDUSTRIAL LIMITED
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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.
Corrosion Resistance:
*Good resistance to the atmosphere, freshwater, foods, alkalies, and mild acids. Best resistance in the hardened and tempered and passivated condition. A smooth polished surface also assists.
*The corrosion resistance of grade 440C approximates that of grade 304 in many environments.
Heat Resistance:
*Not recommended for use in temperatures above the relevant tempering temperature, because of reduction in mechanical properties by over-tempering.
Heat Treatment:
*Annealing - Full anneal - 850-900°C, slow furnace cool to about 600°C and then air cool. Sub-critical Annealing - 735-785°C and slow furnace cool.
H*ardening - Heat to 1010-1065°C, followed by quenching in warm oil or air. Oil quenching is necessary for heavy sections. Immediately temper at 150-370°C to obtain a wide variety of hardness values and mechanical properties as indicated in the accompanying table.
*Tempering in the range 425-565°C is to be avoided because of reduced impact resistance and corrosion resistance. Tempering
in the range 590-675°C results in lower hardness (the product become machinable) and high impact resistance.
Welding:
*If welding is necessary pre-heat at 250°C and follow welding with a full anneal. Grade 420 filler will give a high hardness weld (although not as high as the 440C), but 309 or 310 will produce soft welds with higher ductility.
Machining:
*In the annealed condition this grade is relatively easily machined; approximately the same as for high speed steel. Chips are tough and stringy so chip breakers are important. If these grades are hardened machining becomes more difficult and probably impossible.
440C Stainless Steel Chemical Composition:
Weight % (all values are maximum unless a range is otherwise indicated)
| Element | Content (%) |
| Iron, Fe | 79.15 |
| Chromium, Cr | 17 |
| Carbon, C | 1.1 |
| Manganese, Mn | 1 |
| Silicon, Si | 1 |
| Molybdenum, Mo | 0.75 |
440C Stainless Steel Mechanical Properties:
| Properties | Metric | Imperial |
| Tensile strength | 760-1970 MPa | 110000-286000 psi |
| Yield strength (@ strain 0.200%) | 450-1900 MPa | 65300-276000 psi |
| Bulk modulus | 166 GPa | 24100 ksi |
| Shear modulus | 83.9 GPa | 12200 ksi |
| Elastic modulus | 200 GPa | 29008 ksi |
| Poisson's ratio | 0.27-0.30 | 0.27-0.30 |
| Elongation at break | 2-14 % | 2-14 % |
| Hardness, Rockwell B (converted from Brinell hardness) | 97 | 97 |
440C Stainless Steel Applications:
FAQ:
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A: Yes , we are manufacturer. We have our own factory.
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