Stainless Steels 440 Strips
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Gnee Super Alloy (Tianjin) Co., Ltd. is one of the most professional manufacturers and suppliers of stainless steels 440 strips in China. If you're going to wholesale high quality stainless steels 440 strips made in China, welcome to get free sample from our factory. Good service and reasonable price are available.
Stainless steels 440 Strips 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 strip is a high carbon martensitic stainless steel.
It has high strength, moderate corrosion resistance, and good hardness and wear resistance. Grade 440C strip 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.
| Property | 440 Stainless Steel Strip |
|---|---|
| Material Type | 440 Stainless Steel |
| Thickness Range | 0.1 mm - 3.0 mm |
| Width Range | 5 mm - 600 mm |
| Hardness (HV) | ≥ 200 HV |
| Tensile Strength | ≥ 850 MPa |
| Yield Strength | ≥ 650 MPa |
| Elongation | ≥ 10% |
| Standard | ASTM A240, ASTM A666 |
| Surface Finish | 2B, 2D, BA, No.4, No.8 |
| Edge | Mill Edge, Slit Edge |
| Coil Weight | ≤ 5 tons |
| Application | Blades, saws, bearings, valve components, etc. |
STAINLESS STEEL 440 STRIP 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.
Hardening – 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.
STAINLESS STEEL 440 STRIP 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.
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