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Stainless Steel 316Ti Seamless Pipe | Titanium-Stabilized ASTM A312 TP316Ti
1. Description
Stainless steel 316Ti seamless pipe is a titanium-stabilized austenitic chromium-nickel-molybdenum pipe manufactured under ASTM A312 as TP316Ti, with the UNS designation S31635. Titanium combines with carbon and nitrogen to form stable compounds, reducing the formation of chromium carbides during welding or prolonged exposure to elevated temperatures. This improves resistance to intergranular corrosion in susceptible temperature conditions.
Like Grade 316, TP316Ti contains molybdenum, which provides better resistance to pitting and crevice corrosion than 304-series stainless steels in many chloride-containing environments. Its seamless construction eliminates a longitudinal weld seam and provides a continuous pipe wall. TP316Ti seamless pipe is commonly selected for chemical processing, heat exchangers, high-temperature process lines, power-generation equipment, and industrial piping systems requiring both corrosion resistance and stabilized material performance.
316Ti stainless steel seamless pipe begins with a solid TP316Ti billet whose chromium, nickel, molybdenum, carbon, and titanium contents are verified before production. The billet is heated and pierced into a hollow shell, then cold drawn or cold rolled to achieve the specified outside diameter and wall thickness. After forming, the pipe undergoes controlled solution heat treatment, followed by straightening, pickling, cutting, and final inspection. Chemical composition, mechanical properties, dimensions, surface condition, and material traceability are verified according to the applicable standard and purchase-order requirements. Learn more in our stainless steel seamless pipe manufacturing process guide.
316Ti and 316L have broadly similar general and pitting corrosion resistance, but TP316Ti uses titanium stabilization to improve resistance to intergranular corrosion during welding or elevated-temperature exposure.
2. ASTM A312 TP316Ti Seamless Pipe Specifications
| Specification | Details |
|---|---|
| Product | SS 316Ti Seamless Pipe |
| Material Standard | ASTM A312/A312M, Grade TP316Ti |
| UNS Designation | S31635 |
| Manufacturing Method | Seamless; cold-finished (cold rolled, cold drawn), as specified |
| Outside Diameter | NPS 1/8″ to 32″ |
| Wall Thickness | SCH5 TO SCH160 , SCH XXS |
| Dimensional Standard | ASME B36.19 ,ASME B36.10 or other agreed dimensions |
| Length | Random or cut length, subject to order requirements |
| Pipe Ends | Plain or beveled ends, as ordered |
| Heat Treatment | Heat-treated in accordance with the applicable ASTM A312 requirements |
| Testing | Hydrostatic test or nondestructive electric test, as required by ASTM A312 |
Available sizes, schedules and lengths depend on production and stock. Please provide your required dimensions and quantity for confirmation.
Chemical Composition of ASTM A312 TP316Ti
TP316Ti contains titanium for stabilization and molybdenum for improved resistance to pitting and crevice corrosion.
| Element | Requirement |
|---|---|
| Grade | TP316Ti |
| UNS designation | S31635 |
| Carbon (C) | ≤0.08% |
| Manganese (Mn) | ≤2.00% |
| Phosphorus (P) | ≤0.045% |
| Sulfur (S) | ≤0.030% |
| Silicon (Si) | ≤0.75% |
| Chromium (Cr) | 16.0–18.0% |
| Nickel (Ni) | 10.0–14.0% |
| Molybdenum (Mo) | 2.0–3.0% |
| Nitrogen (N) | ≤0.10% |
| Titanium (Ti) | Minimum 5 × (C + N); maximum 0.70% |
All values are weight percentages. Confirm the limits against the ASTM A312 edition specified in the order.
Mechanical Properties of ASTM A312 TP316Ti
The following are minimum room-temperature requirements for TP316Ti seamless pipe.
| Grade | Tensile Strength | Yield Strength | Longitudinal Elongation |
|---|---|---|---|
| TP316Ti | ≥515 MPa | ≥205 MPa | ≥35% |
Elongation requirements may vary with the test specimen and its orientation.
Outside Diameter Tolerances
| NPS Range | Outside Diameter | Tolerance |
|---|---|---|
| NPS 1/8–1½ | 10.3–48.3 mm | +0.4 / −0.8 mm |
| Over NPS 1½–4 | Over 48.3–114.3 mm | +0.8 / −0.8 mm |
| Over NPS 4–8 | Over 114.3–219.1 mm | +1.6 / −0.8 mm |
| Over NPS 8–18 | Over 219.1–457.2 mm | +2.4 / −0.8 mm |
| Over NPS 18–26 | Over 457.2–660.4 mm | +3.2 / −0.8 mm |
| Over NPS 26–34 | Over 660.4–863.6 mm | +4.0 / −0.8 mm |
Additional ovality requirements may apply to thin-wall pipe. Final acceptance follows the ASTM A999 edition specified in the order.
Wall Thickness Tolerances
The following values apply when nominal wall thickness is specified.
| Pipe Size and Wall Ratio | Over | Under |
|---|---|---|
| NPS 1/8–2½, all t/D ratios | +20.0% | −12.5% |
| NPS 3–18, t/D ≤5% | +22.5% | −12.5% |
| NPS 3–18, t/D >5% | +15.0% | −12.5% |
| NPS 20 and larger, seamless, t/D ≤5% | +22.5% | −12.5% |
| NPS 20 and larger, seamless, t/D >5% | +15.0% | −12.5% |
The t/D value is nominal wall thickness divided by specified outside diameter. Different requirements apply when minimum wall thickness is ordered.
TP316Ti Equivalent Material Designations
| Standard System | Material Designation |
|---|---|
| ASTM / ASME | TP316Ti |
| UNS | S31635 |
| EN | 1.4571 / X6CrNiMoTi17-12-2 |
| JIS commonly cited designation | SUS316Ti |
| GB/T approximate equivalent | 06Cr17Ni12Mo2Ti |
| GOST approximate equivalent | 10Х17Н13М2Т |
These designations are approximate comparisons. Confirm chemical composition and product requirements before ordering to another standard.
3. How is the ss 316Ti seamless pipe inspected and tested, packed?
· Chemical analysis
· Tensile and flattening tests
· Dimensional inspection
· Hydrostatic or non-destructive electric testing
· PMI and IGC testing when ordered
· EN 10204 3.1 MTC and heat-number traceability
· Packed in woven bag or wooden box or others you require
4. Why Choose us as Your 316Ti Stainless Steel Seamless Pipe Manufacturer & Supplier?
1. Extensive Inventory
We maintain approximately 2,000 tons of stainless steel products in commonly requested grades, sizes, and wall thicknesses. This inventory allows us to respond efficiently to urgent orders and different purchasing quantities.
2. In-House Manufacturing
With established production equipment, experienced workers, and controlled manufacturing processes, we produce 304 stainless steel seamless pipes according to applicable standards and customer specifications.
3. Reliable Lead Times
In-house production, available inventory, and coordinated production scheduling give us better control over order progress. Lead times are confirmed according to the required size, quantity, testing, and finishing requirements.
4. Quality Assurance and Documentation
Our quality team conducts material verification, dimensional inspection, and applicable mechanical and nondestructive testing. EN 10204 3.1 inspection certificates and heat-number traceability can be provided with each order.
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