When purchasing personnel, engineers, and project managers search for "Is SUS316 better than SUS304?", they are usually trying to determine which stainless steel grade is more suitable for their application, rather than simply comparing which one is more expensive.
In short, SUS316 is not always superior to SUS304; it only offers advantages in specific environments, particularly those involving corrosion and chlorides.
Is SUS316 better than SUS304?
Due to its molybdenum content, 316 stainless steel is better suited for corrosive environments (marine, chemical, and saline environments), while 304 is more common and less expensive, making it suitable for general/indoor use, such as in kitchens or construction, offering a balance of corrosion resistance, appearance, and price. For superior durability in harsh environments, choose 316; for cost-effective standard applications, 304 is a better choice.
What is SUS316 material?
SUS316 stainless steel is a popular austenitic alloy, similar to 304 but with added molybdenum, giving it superior resistance to chlorides, acids, and pitting corrosion, making it ideal for marine, chemical, and food processing environments where harsher conditions exist. "SUS" denotes its Japanese Industrial Standard (JIS) origin, equivalent to the globally recognized AISI 316, used widely in Asia and beyond for its excellent durability, corrosion resistance, and formability.
What does SUS304 mean?
SUS304 is the Japanese designation for a common, versatile austenitic stainless steel (also known as AISI 304 or 18/8 stainless steel), valued for its excellent corrosion resistance, durability, and formability, making it ideal for kitchenware, food processing, medical tools, architectural accents, and industrial applications due to its balanced mix of chromium (18%) and nickel (8%).
SUS304 vs SUS316: Standard
| Item | SUS304 | SUS316 |
| JIS Standard | JIS G4303 / G4304 / G4305 | JIS G4303 / G4304 / G4305 |
| Stainless Steel Type | Austenitic | Austenitic |
| Key Alloying Difference | - | Contains Mo (Molybdenum) |
The main difference between SUS304 and SUS316 Chemical Composition Comparison (Core Difference)
| Element | SUS304 | SUS316 |
| Carbon (C) | ≤ 0.08 | ≤ 0.08 |
| Silicon (Si) | ≤ 1.00 | ≤ 1.00 |
| Manganese (Mn) | ≤ 2.00 | ≤ 2.00 |
| Phosphorus (P) | ≤ 0.045 | ≤ 0.045 |
| Sulfur (S) | ≤ 0.030 | ≤ 0.030 |
| Chromium (Cr) | 18.0 – 20.0 | 16.0 – 18.0 |
| Nickel (Ni) | 8.0 – 10.5 | 10.0 – 14.0 |
| Molybdenum (Mo) | - | 2.0 – 3.0 |
SUS304 and SUS316 ： Mechanical Properties Comparison
| Property | SUS304 | SUS316 |
| Tensile Strength (MPa) | ≥ 520 | ≥ 520 |
| Yield Strength (MPa) | ≥ 205 | ≥ 205 |
| Elongation (%) | ≥ 40 | ≥ 40 |
| Hardness (HB) | ≤ 201 | ≤ 217 |
Is SUS316 stronger than SUS304?
Yes, SUS316 is generally considered stronger and more durable than SUS304, primarily due to its added molybdenum, which significantly enhances its resistance to corrosion, especially from chlorides, making it better for harsh, marine, or chemical environments, though their basic tensile strength is similar; 316's superior performance in corrosive situations translates to better long-term durability in demanding applications.
Does SUS316 have better corrosion resistance than SUS304?
Yes, SUS316 has significantly better corrosion resistance than SUS304, primarily due to its added molybdenum content (2-3%), which provides superior protection against chlorides, salts, and harsh chemicals, making it ideal for marine, chemical, and medical applications, while 304 is sufficient for milder, general-purpose uses and is more cost-effective.
Is SUS316 more expensive than SUS304?
Yes, SUS316 (or 316 stainless steel) is generally more expensive than SUS304 (304 stainless steel) because it contains added molybdenum and higher nickel content for superior corrosion resistance, especially in chloride-rich environments, though the exact price difference fluctuates with market conditions, typically ranging from 20-40% more.
Can SUS304 be used as a substitute for SUS316?
Yes, SUS304 can substitute for SUS316 in general applications where high corrosion resistance isn't critical, as it's cheaper and easier to work with, but it's not a suitable direct replacement in harsh, chloride-rich environments like marine settings or chemical processing, where SUS316's added molybdenum makes it superior for preventing pitting corrosion and ensuring longevity.
If you have project requirements for SUS 304 or SUS 316 stainless steel, we welcome your order. GNEE has a large inventory of popular products for you to choose from. We can process the material into various practical product forms, including sheets, coils, pipes, bars, and wires. For detailed chemical composition information and free samples, please contact our factory immediately. We offer competitive prices and excellent service.
