In the instrumentation industry, the choice of stainless steel material directly affects the corrosion resistance, mechanical strength, service life and cost of the product. SUS304, SS316 and SS316L are three common types of stainless steel. This article will analyze their differences in detail and provide selection recommendations based on industry application scenarios.
1. Basic composition and core differences
SUS304 (304 stainless steel)
Composition: Based on 18% chromium (Cr) and 8% nickel (Ni), without molybdenum (Mo), and with a high carbon (C) content.
Features:
- Resistant to general corrosion (such as weak acid, atmospheric environment), but weak resistance to chloride ion corrosion.
- Excellent mechanical properties, easy to stamp, weld and process.
- Non-magnetic, low cost, it is a general-purpose stainless steel.
SS316 (316 stainless steel)
Composition: Add 2-3% molybdenum (Mo) to 304, and the nickel content is slightly higher (10-14%).
Features:
- Corrosion resistance is significantly improved, especially suitable for chloride ion environment (such as seawater, chemical media).
- Better high temperature strength, suitable for high temperature and high pressure scenarios.
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