Loại nào tốt hơn, thép không gỉ 310 hay 316?

Loại nào tốt hơn, thép không gỉ 310 hay 316?

When selecting stainless steel materials, the question “Which is better: stainless steel 310 or 316?” is commonly asked, especially for projects involving high-temperature and corrosive environments. According to a McKinsey report, within the global energy sector, Thép không gỉ 310 represents 30% of the market share for high-temperature applications, while 316 stainless steel accounts for 40% in marine engineering. This often leaves buyers perplexed when selecting materials: “Which is better, 310 or 316 stainless steel?”

However, a comparison between 310 and 316 stainless steel isn’t straightforward—it depends entirely on your project’s specific environment and performance requirements.
 
Determining which is better also requires considering the classifications. Stainless steel 310 belongs to the high-temperature alloy series, commonly used in seamless pipes and plates, while stainless steel 316 focuses more on corrosion-resistant applications, such as welded pipes and fasteners. In the chemical industry, 316 stainless steel accounts for up to 50% of usage, but in high-temperature scenarios, Thép không gỉ 310 offers superior stability.
Mục lục Thu gọn
1 Stainless Steel 310 vs 316:Difference
2 How to Choose 310 or 316 Stainless Steel
3 Loại nào tốt hơn, thép không gỉ 310 hay 316?

Stainless Steel 310 vs 316:Difference

Chemical Composition

The main differences between 310 and 316 stainless steel are their composition.

LớpCSiMnPSNiCrMo
310≤0.015≤0.15≤2.0≤0.020≤0.01519.0-21.024.0-26.0≤0.10
316≤0.08≤1.0≤2.0≤0.045≤0.0310.0-14.016.0-18.02.0-3.0

Thép không gỉ 310 is a high-chromium, high-nickel austenitic stainless steel containing 25% chromium and 20% nickel, specifically engineered for high-temperature oxidation resistance. 

316 stainless steel contains 16-18% chromium, 10-14% nickel, and 2-3% molybdenum, enhancing chloride corrosion resistance.

The high chromium and nickel content of stainless steel 310 enables it to perform well in high-temperature oxidizing environments, while the molybdenum in stainless steel 316 enhances its resistance to pitting corrosion. In acidic environments, stainless steel 316 is 15% more corrosion-resistant than stainless steel 310. But, at temperatures over 800°C, stainless steel 310 offers superior oxidation resistance, making it the preferred choice for engineers.

Corrosion Resistance

Grade 310 is better suited for sulfidic or carbonizing environments, making it ideal for metallurgical applications, while 316 offers superior corrosion resistance in chloride conditions due to its molybdenum content.

316 steel, containing 2–3% Mo (molybdenum), provides significant resistance to pitting and crevice corrosion:

316 or 316L is preferred in the following applications:

  • Seawater environments
  • Chloride environments
  • Salt spray environments
  • Weakly acidic media
  • Pharmaceutical, food processing, and purified water systems

In contrast, the corrosion resistance of 310 is more similar to 304,with moderate resistance.

High-Temperature Property

310 is stable at 1100°C, while 316 is susceptible to sensitization above 425°C, leading to intergranular corrosion.

310 (25Cr-20Ni) is a high-temperature steel offering strong oxidation resistance and creep resistance.

  • Continuous service temperature up to 1100°C.
  • Intermittent high-temperature exposure up to 1150°C.
  • Significantly superior oxidation resistance compared to 316.

316 retains good strength below 800°C but has a lower high-temperature limit than 310, primarily used in medium and low temperature environments.

Grade 310 is the preferred choice for the following applications; 316 cannot be substituted:

  • Furnace tubes
  • Metallurgical heat treatment equipment
  • Industrial kiln support components
  • Burner components
  • Drying oven bolts

Mechanical Properties

310 and 316 exhibit similar strength, but:

  • 316 is more weldable
  • 316 has superior cold workability
  • 316 offers a more comprehensive range of specifications (including pipes, plates, flanges, etc.)
  • 310 maintains good strength at elevated temperatures but exhibits greater low-temperature brittleness.

Cost

Stainless steel 310 contains less chromium and molybdenum, is generally more affordable than stainless steel 316.

How to Choose 310 or 316 Stainless Steel

High-Temperature Applications

Thép không gỉ 310 is suitable for high-temperature applications. It maintains structural stability at 900–1100°C and is resistant to powdering or failure.

  • Metallurgical Furnaces
  • Heat Treatment Trays
  • Industrial Incinerators
  • Industrial Boilers
  • Flue Pipes
  • High-temperature Fan Equipment

Highly Corrosive Environments

In environments containing chlorides, seawater, or strong acids, or where stringent corrosion resistance is required, 316 stainless steel (especially 316L) is the superior choice. The additional molybdenum content provides enhanced resistance to pitting and crevice corrosion, significantly extending service life.

  • Marine Engineering
  • Shipbuilding
  • Chemical Pipelines
  • Pharmaceutical and Food Processing Equipment
  • Saltwater, Chloride-containing Media
  • Reverse Osmosis,Water Treatment Systems

Moderate Temperature, Slight Corrosion Environment

Both 310 and 316 are suitable for applications with moderate temperatures and low corrosion resistance requirements; if the budget permits, prefer material 316.

  • Low-strength Acidic Flue Gas Piping
  • Moderate-temperature Heat Exchange Systems
  • Industrial Building Structural Components

Loại nào tốt hơn, thép không gỉ 310 hay 316?

Material Selection Recommendations

Temperatures exceeding 900°C: 310 is essential (no alternative)

Seawater/chloride /highly corrosive: 316 is superior

Budget constraints but stable corrosion resistance required: 316L offers better value

Prioritizing high-temperature component longevity: 310 is significantly more stable

If welding fabrication is also required: 316 is easier to process. 

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Các bài viết khác

Loại thép không gỉ nào không có từ tính?

Loại thép không gỉ nào không có từ tính?

Không phải tất cả các loại thép không gỉ đều có từ tính. Các loại thép không gỉ 304, 316, 321, 310 và 904L không có từ tính ở trạng thái ủ. Các loại thép ferit và martensit (409, 430, 410) có từ tính.

Thép không gỉ 410

Sự khác biệt giữa thép không gỉ 410 và 304 là gì?

Cả thép không gỉ 304 và 410 đều là những loại vật liệu thép không gỉ phổ biến, có khả năng chống ăn mòn và chịu nhiệt nhất định. Trong bài viết này, chúng ta hãy cùng tìm hiểu những điểm khác biệt chính giữa thép không gỉ 410 và 304.

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