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TP316Ti 1.4571 UNS S31635 SEAMLES STAINLESS STEEL PIPE AND TUBE

Seamless Stainless Steel 316Ti Pipe

Seamless Stainless Steel 316Ti Pipe employs a titanium-stabilized version of the 316 alloy, which offers enhanced resistance to sensitization and intergranular corrosion following exposure to high temperatures. This stabilization ensures superior performance in aggressive corrosive environments and maintains excellent strength and oxidation resistance at elevated temperatures.

① STANDARD: ASTM A213/ ASTM A312/ ASTM A249/ ASTM A269/ GOST 9940 /GOST 9941...
② OD RANGE : 6-1016 MM
③ THICKNESS RANGE: 1-65 MM

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Introduction

Seamless Stainless Steel 316Ti Pipe employs a titanium-stabilized version of the 316 alloy, which offers enhanced resistance to sensitization and intergranular corrosion following exposure to high temperatures. This stabilization ensures superior performance in aggressive corrosive environments and maintains excellent strength and oxidation resistance at elevated temperatures.

Product Introduction

TP316Ti (UNS S31635, EN 1.4571) is a titanium-stabilized austenitic stainless steel renowned for its enhanced corrosion resistance and high-temperature performance. As a variant of the 316 stainless steel family, TP316Ti incorporates titanium (Ti: 5×(C%+N)-0.7), which stabilizes the alloy against carbide precipitation during welding and high-temperature service. This makes it particularly suitable for applications where weldability and long-term corrosion resistance are critical.

Manufactured to standards including ASTM A213, ASTM A312, and GOST, TP316Ti seamless pipes and tubes undergo precision processing to ensure uniform wall thickness, mechanical consistency, and dimensional accuracy. The alloy’s unique composition—combining chromium (16.00–18.00%), nickel (10.00–14.00%), molybdenum (2.00–3.00%), and titanium—delivers a balance of strength, ductility, and resistance to a wide range of corrosive media.

Zhejiang Xintongda Special Steel Manufacturing Co., Ltd. provides TP316Ti products that meet the highest quality benchmarks, offering reliable solutions for industries ranging from chemical processing to marine engineering.

Product Parameters Comparison Module

Chemical Composition Comparison (316 Family Alloys)

Grade	UNS	C Content	Ti Content	Mo Content	Key Feature
316	S31600	≤0.08	-	2.00–3.00	Standard corrosion resistance
316L	S31603	≤0.035	-	2.00–3.00	Low-carbon for improved weldability
316H	S31609	0.04–0.10	-	2.00–3.00	High-temperature strength
316Ti	S31635	≤0.08	5×(C%+N)–0.7	2.00–3.00	Titanium-stabilized for carbide resistance
316N	S31651	≤0.08	-	2.00–3.00	Nitrogen-strengthened for higher strength
316LN	S31653	≤0.035	-	2.00–2.50	Low-carbon + nitrogen for corrosion resistance

Mechanical Properties Comparison

Grade	Tensile Strength	Yield Strength	Elongation	Hardness (HRB)	Application Focus
316	≥75 ksi (515 MPa)	≥30 ksi (205 MPa)	≥35%	≤95	General corrosion resistance
316L	≥70 ksi (485 MPa)	≥25 ksi (170 MPa)	≥35%	≤95	Welded structures
316H	≥75 ksi (515 MPa)	≥30 ksi (205 MPa)	≥35%	≤95	High-temperature pressure parts
316Ti	≥75 ksi (515 MPa)	≥30 ksi (205 MPa)	≥35%	≤95	Welded components in corrosive environments
316N	≥80 ksi (550 MPa)	≥35 ksi (240 MPa)	≥35%	≤100	High-strength applications
316LN	≥75 ksi (515 MPa)	≥30 ksi (205 MPa)	≥35%	≤95	Chloride-resistant structures

Main Product Parameters

Chemical Composition

Grade	UNS	C	Mn	P	S	Si	Cr	Ni	Mo	N	Ti
316Ti	S31635	≤0.08	≤2.00	≤0.045	≤0.03	≤0.75	16.00–18.00	10.00–14.00	2.00–3.00	≤0.10	5×(C%+N)–0.7

Mechanical Properties

Grade	UNS	Tensile Strength (ksi/MPa)	Yield Strength (ksi/MPa)	Elongation (%)	Hardness (HRB)
316Ti	S31635	≥75/515	≥30/205	≥35	≤95

Physical Properties

Property	Value
Density	7.98 g/cm³
Melting Point	1375–1450°C
Thermal Conductivity	16.3 W/m·K (100°C)
Electrical Resistivity	74.0 μΩ·cm
Thermal Expansion	16.0 μm/m·°C (20–100°C)
Elastic Modulus	193 GPa

Dimensions

Outer Diameter: 6–1016 mm
Wall Thickness: 1–65 mm
Custom lengths available upon request

Product Features

Enhanced Corrosion Resistance

TP316Ti’s titanium stabilization significantly reduces the risk of intergranular corrosion, particularly in welded components. Key corrosion-resistant attributes include:

Chloride Environments: Resists pitting and crevice corrosion in chloride-rich media, though not recommended for hot seawater applications.
Chemical Media: Performs well in acids, alkalis, and salt solutions, outperforming 304 stainless steel in corrosive conditions.
Welded Structures: Titanium addition minimizes carbide precipitation in heat-affected zones (HAZs), maintaining corrosion resistance post-welding—unlike 316, which may require post-weld annealing.

High-Temperature Stability

Withstands continuous service up to 870°C, demonstrating good oxidation resistance—comparable to 316H but with better weldability.
Retains mechanical strength at elevated temperatures, making it suitable for furnace components where 316L may lose stability.

Superior Weldability

Readily weldable by TIG, MIG, and stick welding methods without specialized preheating—outperforming 316H, which requires careful heat control.
Reduced need for post-weld heat treatment due to titanium stabilization, lowering fabrication costs compared to non-stabilized alloys like 316.

Mechanical Strength & Ductility

Balances high tensile strength (≥515 MPa) with excellent ductility (≥35% elongation), enabling complex forming—similar to 316 but with improved thermal stability.
Maintains toughness across a wide temperature range, from ambient to high-service conditions, unlike 316L, which has lower tensile strength.

Application Scenarios

Chemical Processing

Corrosive Fluid Handling: Piping for acids, alkalis, and salt solutions in chemical plants—preferred over 316 for welded systems.
Reactors & Heat Exchangers: Components exposed to aggressive media, where titanium stabilization prevents weld decay (unlike 316).

Pharmaceutical & Food Industries

Hygienic Systems: Tubing for drug manufacturing and food processing, meeting strict cleanliness standards—similar to 316L but with better high-temperature resistance.
Sterilization Equipment: Pipes and vessels resistant to corrosion from cleaning agents, outperforming 304 in durability.

Petrochemical & Oil & Gas

Refinery Equipment: Process lines, valves, and heat exchangers in oil refining—chosen over 316 for its resistance to sulfur compounds.
Offshore Applications: Corrosion-resistant components for marine-based operations, where 316Ti’s chloride resistance exceeds 304.

Pulp & Paper Manufacturing

Chemical Pulping: Pipes for conveying pulping chemicals—more durable than 316 in acidic conditions.
Bleaching Processes: Equipment exposed to chlorine-based agents, outperforming 316L in long-term use.

FAQ

What is the key advantage of 316Ti over 316L?

316Ti’s titanium stabilization provides superior resistance to intergranular corrosion in welded joints, making it ideal for fabricated structures. 316L relies on low carbon to reduce carbide precipitation, but 316Ti offers more reliable performance in high-temperature or heavily welded applications.

When should I choose 316Ti over 316N?

Select 316Ti for applications requiring excellent corrosion resistance in welded components, such as chemical reactors. Choose 316N when high tensile strength (≥80 ksi) is prioritized, e.g., in high-pressure pipes, but note that 316N has lower corrosion resistance than 316Ti in some media.

Can 316Ti replace 316H in high-temperature applications?

316H is preferred for continuous service above 500°C due to its higher carbon content, which enhances creep strength. 316Ti is suitable up to 870°C for oxidation resistance but may have lower strength than 316H at very high temperatures.

Is 316Ti more expensive than 316?

Yes, 316Ti’s titanium addition increases production costs. However, its superior weldability and corrosion resistance in critical applications often justify the expense compared to rework costs with 316.

How does 316Ti perform vs. duplex stainless steels in seawater?

Duplex alloys (e.g., 2205) offer better resistance to hot seawater and chloride stress corrosion. 316Ti is suitable for ambient-temperature marine applications but may fail in hot seawater, where duplex steels are preferred.