The main differences between 410 stainless steel bar and 420 stainless steel bar are as follows:
I. Chemical composition
1. 410 stainless steel:
- Carbon (C) content is generally around 0.15%.
- Chromium (Cr) content is between 11.5% - 13.5%.
- Other elements such as manganese (Mn), silicon (Si), phosphorus (P), sulfur (S) and other contents are also specified accordingly.
2. 420 stainless steel:
- The carbon content is relatively high, usually in the range of 0.16% - 0.25%.
- The chromium content is also high, about 12.0% - 14.0%.
- It also contains a certain amount of molybdenum (Mo), vanadium (V) and other elements to improve its performance.
II. Performance characteristics
1. Hardness:
- 410 stainless steel bar: The hardness is relatively low. After heat treatment, the hardness can reach about HRC40 - 45.
- 420 stainless steel bar: It has a higher hardness and can reach HRC50 - 55 after heat treatment. It is suitable for occasions that require higher hardness.
2. Corrosion resistance:
- Both have a certain degree of corrosion resistance, but the corrosion resistance of 410 stainless steel is slightly inferior to that of 420 stainless steel.
- 410 stainless steel performs better in dry environments, but is prone to corrosion in humid or corrosive environments.
- Due to its high chromium content and other alloying elements, 420 stainless steel has relatively good corrosion resistance, especially in some weakly corrosive environments.
3. Strength:
- The strength of 420 stainless steel bars is generally higher than that of 410 stainless steel bars.
- This makes 420 stainless steel more suitable for mechanical parts and structural parts that bear larger loads.
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III. Uses
1. 410 stainless steel bars:
- Commonly used in general mechanical structural parts, bolts, nuts, valves, etc., where hardness and corrosion resistance are not too high.
- It can also be used for some decorative parts, such as railings, handrails, etc.
2. 420 stainless steel rod:
- It is mainly used to manufacture knives, surgical instruments, bearings and other parts that require high hardness and corrosion resistance.
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