316Ti Buttweld Pipe Fittings
EN 1.4571 (X6CrNiMoTi17-12-2) / ASTM A403 WP316Ti — titanium-stabilised 316 stainless steel. The dominant specification in German engineering contracts (AD 2000, TÜV) and common in Central European projects. Corrosion performance essentially equal to 316L (EN 1.4404) — Ti stabilisation provides anti-sensitization assurance up to 550°C. EN 10253-2 Type B. EN 10204 3.1/3.2. PED 2014/68/EU.
½″–48″
Size Range
PRE ~24
Pitting Index
520 MPa
Min UTS (EN)
550°C
Max Stabilised
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316Ti Grade Equivalents
| ASTM | EN W.Nr. | EN Name | UNS | Notes |
|---|---|---|---|---|
| A403 WP316Ti (informal) | 1.4571 | X6CrNiMoTi17-12-2 | S31635 | German standard |
| A182 F316Ti | 1.4571 | — | S31635 | — |
| A312 TP316Ti | 1.4571 | — | S31635 | — |
Note: 1.4571 (316Ti) is primarily an EN designation. ASTM coverage of WP316Ti in A403 is limited — projects specifying 1.4571 are generally European and will call out EN 10253-2 Type B as the fitting standard.
Chemical Composition — 316Ti / 1.4571
| Standard | C | Cr | Ni | Mo | Ti | Mn |
|---|---|---|---|---|---|---|
| ASTM A403 WP316Ti | ≤0.080 | 16.0–18.0 | 10.0–14.0 | 2.0–3.0 | ≥5×C (0.10–0.60) | ≤2.0 |
| EN 1.4571 (X6CrNiMoTi17-12-2) | ≤0.080 | 16.5–18.5 | 10.5–13.5 | 2.0–2.5 | ≥5×C (0.10–0.70) | ≤2.0 |
Mo content differentiates 316Ti (1.4571) from 321 (1.4541) — the Mo addition provides the pitting resistance (PRE ~24) characteristic of 316 grades. Ti ≥5×C prevents sensitization up to 550°C.
Mechanical Properties — 316Ti / 1.4571
| Standard | Min. UTS (MPa) | Min. YS (MPa) | Elongation | Max Hardness |
|---|---|---|---|---|
| ASTM A403 WP316Ti | 515 | 205 | ≥35% | 217 HBW |
| EN 1.4571 (EN 10253-2) | 490–690 | ≥205 | ≥35% | 220 HBW |
Heat Treatment & Welding — 316Ti / 1.4571
✓ No PWHT Required — solution annealed. Ti stabilisation up to 550°C.
EN 1.4571 / 316Ti fittings are supplied in the solution annealed condition. No post-weld heat treatment is required. Titanium stabilisation provides protection against sensitization up to 550°C service temperature, making 1.4571 particularly suitable for applications with prolonged elevated-temperature service within that range.
Welding Guidance
- Filler metal (GTAW/TIG): ER316L or ER316Ti (where available). ER316L is widely used and produces a weld with corrosion resistance equivalent to the base metal in most service conditions.
- SMAW filler: E316L-16 or E316Ti-16.
- Inter-pass temperature: ≤150°C to minimise HAZ grain growth.
- No preheat required for standard wall thicknesses.
- ASME P-No.: 8, Group 1.
1.4571 (316Ti) vs 1.4404 (316L): Corrosion Comparison
1.4571 and 1.4404 have essentially the same corrosion resistance (PRE ~24, same Cr/Ni/Mo target chemistry). The primary difference is the sensitization prevention mechanism — Ti stabilisation in 1.4571 versus low carbon (C ≤0.030%) in 1.4404. Both are fully acceptable per PED 2014/68/EU. The choice is driven by project specification: 1.4571 is the default in German and Central European engineering; 1.4404 (316L) is standard for the rest of the world.
1.4571 (316Ti) vs 1.4404 (316L) — Specification Comparison
| Property | 1.4404 (316L) | 1.4571 (316Ti) |
|---|---|---|
| Carbon max | ≤0.030% | ≤0.080% |
| Stabilisation method | Low C | Ti ≥5×C |
| PRE (Pitting Resistance) | ~24 | ~24 |
| Dominant market | Global / UK / Netherlands / Scandinavia | Germany / Austria / Eastern Europe |
| AD 2000 preferred | Yes (acceptable) | Yes (preferred) |
| PED 2014/68/EU | Fully compliant | Fully compliant |
316Ti Fitting Types Available
90° Elbow (LR & SR)
Long Radius & Short Radius
EN 10253-2 Type B / ASME B16.9
45° Elbow
Long Radius
EN 10253-2 Type B / ASME B16.9
Equal Tee
Straight tee, equal branch
EN 10253-2 Type B / ASME B16.9
Reducing Tee
Reduced branch outlet
EN 10253-2 Type B / ASME B16.9
Concentric Reducer
Inline bore reduction
EN 10253-2 Type B / ASME B16.9
Eccentric Reducer
Flat bottom / top configurations
EN 10253-2 Type B / ASME B16.9
End Cap
Pipe end closure
EN 10253-2 Type B / ASME B16.9
Stub End (Lap Joint)
For use with lap joint flanges
ASME B16.9
180° Return Bend
Long & short radius
ASME B16.9
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