1.4401 (AISI 316) and 1.4571 (AISI 316Ti) supplier manufacturer, contact us to get free quote and sample!
Choosing between 1.4401 (AISI 316) and 1.4571 (AISI 316Ti) is a critical decision for engineers in the chemical and marine industries. While both are molybdenum-bearing austenitic steels, the addition of Titanium in 1.4571 stainless steel offers distinct advantages in specific thermal and corrosive environments.
As a specialized stainless steel pipe supplier, we analyze the mechanical properties and application limits of these two grades to help you optimize your project's lifespan and cost-efficiency.
Technical Specifications & Equivalent Standards
To understand the difference between 316 and 316Ti, we must first look at the international naming conventions. 1.4571 is essentially a "Titanium-stabilized" version of 1.4401, designed to prevent intergranular corrosion after welding.
| Standard | 1.4401 Equivalent | 1.4571 Equivalent |
| EN / DIN | X5CrNiMo17-12-2 | X6CrNiMoTi17-12-2 |
| AISI / ASTM | Type 316 | Type 316Ti |
| UNS | S31600 | S31635 / S31703 |
Difference Between 1.4401 and 1.4571:
Chemical Composition
1. EN 1.4401 stainless steel (316 Stainless Steel Tube):
Main Elements: Chromium (16-18%), Nickel (10-14%), Molybdenum (2-3%)
Carbon Content: ≤ 0.07%
Manganese: ≤ 2%
Silicon: ≤ 1%
Phosphorus: ≤ 0.045%
Sulfur: ≤ 0.015%
Nitrogen: ≤ 0.11%
2. EN 1.4571 stainless steel(316Ti Stainless Steel Pipe):
Main Elements: Chromium (16-18%), Nickel (10.5-14%), Molybdenum (2-3%)
Carbon Content: ≤ 0.08%
Manganese: ≤ 2%
Silicon: ≤ 0.75%
Phosphorus: ≤ 0.045%
Sulfur: ≤ 0.015%
Titanium: 5x(C+N) - 0.7%
Comparison Table: 1.4401 (AISI 316) vs. 1.4571 (AISI 316Ti)
| Property | 1.4401 (AISI 316) | 1.4571 (AISI 316Ti) | Verdict |
| Alloying Elements | Mo (2.0-2.5%) | Mo + Ti (Titanium) | 1.4571 offers superior intergranular corrosion resistance. |
| Max Service Temp. | Approx. 450°C | Up to 800°C | 1.4571 is the winner for high-heat applications. |
| Welding Performance | Risk of carbide precipitation | Excellent (No post-weld heat treatment needed) | 1.4571 is preferred for heavy-duty welding. |
| Common Applications | Food processing, General chemicals | Pharmaceuticals, High-temp acidic environments | Selection depends on specific operating conditions. |
Key Differences: 1.4401 vs 1.4571
Superior High-Temperature Stability
1.4401: Recommended for service temperatures up to 450°C.
1.4571: The Ti-additives allow it to withstand temperatures up to 800°C without losing its mechanical integrity or corrosion resistance.
Mechanical Strength & Yield
Due to the fine-grained structure provided by Titanium carbonitride precipitates, 1.4571 material often exhibits slightly higher yield strength than standard 1.4401, allowing for potentially thinner wall designs in pressure vessel applications following ASTM A312 standards.
Corrosion Resistance in Chloride Media
While both grades offer excellent resistance to pitting in organic acids, 1.4571 is the preferred choice for heavy-wall welded structures exposed to chlorides, as the titanium prevents "weld decay" without the need for post-weld annealing.
Industrial Applications
1.4401 (316): Best for coastal architecture, food processing equipment, and marine hardware.
1.4571 (316Ti): Preferred for chimney liners, pharmaceutical reactors, and heat exchangers operating in high-chloride environments at elevated temperatures.
FAQ: 1.4401 vs 1.4571
Q1: Is 1.4571 more expensive than 1.4401?
Generally, yes. The addition of Titanium and the more complex smelting process increase the price of 1.4571 pipe. However, the extended service life in high-temp environments often yields a lower total lifecycle cost.
Q2: Why is 316L often used as an alternative to 1.4571?
316L (low carbon) also prevents sensitization but lacks the high-temperature strength (creep resistance) of 1.4571. For applications above 500°C, 316Ti (1.4571) remains the superior technical choice.
Q3: Is 1.4571 magnetic?
In its fully annealed state, 1.4571 is non-magnetic. However, like all austenitic steels, it may develop slight magnetism after cold working or welding.
Expert Procurement Advice
If your project involves heavy welding or operating temperatures above 400°C, investing in 1.4571 (316Ti) is the safest technical decision. For standard corrosive environments at room temperature, 1.4401 (316) offers a more economical solution.
Contact us today for a detailed quote on 1.4571 seamless pipes and 1.4401 stainless steel bars tailored to your specific industrial requirements.
