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Published: November 8, 2025 | Updated: November 8, 2025By Gangsteel Engineering Team – 25+ Years in Stainless Steel Export Excellence
In the critical domain of stainless steels compliant with ASTM A240/A240M and ASME SA240/SA240M standards, 316Ti emerges as a titanium-stabilized austenitic grade whose P number and welding filler wire are essential for ensuring safe, durable joints in high-temperature and corrosive settings.
As a premier producer and exporter based in China, Gangsteel has supplied thousands of tons of 316Ti stainless steel, meeting ASTM A240/A240M specs for plates and sheets, to industries like petrochemical, pharmaceutical, and marine.
If you're qualifying welding procedures under ASME Section IX where P number grouping and filler wire selection are key, understanding 316Ti's classifications is vital. This article explores its P number, recommended welding filler wires, and related data, based on ASTM A240/A240M and ASME SA240/SA240M standards and our mill tests.
From our production lines, we've seen 316Ti's welding prowess: In a 2024 U.S. pharmaceutical facility, our 316Ti components under ASTM A240 /A240M welded with ER316L filler showed no IGC after 1,000 hours at 150°C, as per client inspections. Compliant with ASME SA240/SA240M for pressure apps, 316Ti's P number 8 and filler options like E316LT support robust fastening. Let's delve into the details, from composition to welding practices, to equip you for successful fabrication.
316Ti stainless steel, compliant with ASTM A240/A240M and ASME SA240/SA240M, has a P number of 8 (Group 1) in ASME Section IX, grouping it with austenitic SS for welding qualifications. Recommended welding filler wires include ER316L (AWS A5.9) or E316LT for low-carbon joints, with Ti-added variants like ER316Ti for matching stabilization. This ensures high-strength welds (tensile ~515 MPa) resistant to IGC at 425-815°C. Compared to 316L, 316Ti requires similar fillers but offers better high-temp stability. Density 8.00 g/cm³ aids calcs. Ideal for chemical piping; Gangsteel stocks with certs for custom filler guidance.
The chemical composition of 316Ti, as defined in ASTM A240/A240M and ASME SA240/SA240M, determines its P number 8 grouping and compatibility with low-carbon filler wires.
|
Element |
% Range or Max |
Role in P Number & Welding |
|---|---|---|
|
Carbon (C) |
0.08 max |
Low C with Ti stabilization places it in P8; compatible with low-C fillers to avoid sensitization. |
|
Manganese (Mn) |
2.00 max |
Aids deoxidation in welds; no impact on P number. |
|
Silicon (Si) |
0.75 max |
Improves weld pool fluidity; supports P8 grouping. |
|
Phosphorus (P) |
0.045 max |
Limited for weld integrity; aligns with filler specs. |
|
Sulfur (S) |
0.030 max |
Controlled for hot cracking; low-S fillers recommended. |
|
Chromium (Cr) |
16.00-18.00 |
Core for P8 austenitic classification; enhances filler matching. |
|
Molybdenum (Mo) |
2.00-3.00 |
Boosts pitting; fillers like ER316L match Mo content. |
|
Nickel (Ni) |
10.00-14.00 |
Stabilizes austenite for P8; ensures filler compatibility. |
|
Titanium (Ti) |
5x(C+N) min, 0.70 max |
Key for stabilization; optional Ti in fillers like ER316Ti. |
|
Nitrogen (N) |
0.10 max |
Strengthens; controlled in fillers for weld soundness. |
|
Iron (Fe) |
Balance |
Base for overall weldability. |
This composition under ASTM A240/A240M classifies 316Ti as P number 8, Group 1, for welding with similar austenitics.
Gangsteel's 316Ti meets ASME SA240/SA240M for P number applications.
Under ASME Section IX (QW-422), 316Ti (UNS S31635) is assigned P number 8 (austenitic stainless steels), Group 1, due to its Cr-Ni-Mo composition and weldability. This groups it with 316/316L for procedure qualification, meaning WPS for one can apply to the other with similar fillers. P8 materials require fillers with matching chemistry to avoid cracking; Ti stabilization doesn't change grouping but enhances post-weld performance.
Gangsteel's certs confirm P8 for 316Ti stock.
For uns stainless steel plates, 316Ti P number supports welding.
For 316Ti under ASTM A240/A240M and ASME SA240/SA240M, select fillers that match chemistry and maintain Ti stabilization.
Recommended fillers (per AWS A5.9/A5.4):
|
Filler Type |
AWS Classification |
Composition Notes |
Applications |
|---|---|---|---|
|
Solid Wire |
ER316L |
Low C, Mo 2-3%; no Ti |
General welding; good for P8. |
|
Flux-Cored |
E316LT |
Low C, Mo; rutile flux |
High-deposition; outdoor use. |
|
Ti-Stabilized |
ER316Ti or ER316L-Ti |
Low C, Ti 0.5-0.7% |
Matches 316Ti for high-temp IGC. |
|
Electrode |
E316L-16 |
Low C; coated |
Manual welding; versatile. |
Gangsteel's tests show ER316L fillers yield welds with tensile >500 MPa.
316Ti's properties, per ASTM A240/A240M and ASME SA240/SA240M, remain strong after welding with proper fillers.
|
Property |
Minimum Value |
Welded Typical |
Notes |
|---|---|---|---|
|
Tensile Strength (MPa) |
515 |
550-650 |
Fillers maintain strength. |
|
Yield Strength (MPa) |
205 |
220-280 |
No drop in HAZ with Ti. |
|
Elongation (%) |
40 |
35-45 |
Good ductility post-weld. |
|
Hardness (HRB max) |
95 |
85-95 |
Soft for P8 compliance. |
|
Impact (Charpy J) |
Not req. |
80+ at RT |
Welds retain toughness. |
P number 8 ensures qualified procedures.
Physical traits of 316Ti, compliant with ASTM A240/A240M and ASME SA240/SA240M, aid filler wire selection.
|
Property |
Value |
Notes on Welding |
|---|---|---|
|
Density (g/cm³) |
8.00 |
Consistent for filler calcs. |
|
Melting Range (°C) |
1370-1400 |
High for weld pool stability. |
|
Thermal Conductivity (W/m·K) |
14.6 (at 100°C) |
Good heat flow in welds. |
|
Specific Heat (J/kg·K) |
500 |
Efficient for interpass control. |
|
Thermal Expansion (10^-6 /°C) |
16.5 (20-100°C) |
Low distortion in welded joints. |
These ensure reliable filler performance.
316Ti's corrosion, per ASTM A240/A240M and ASME SA240/SA240M, is preserved in welds with matching fillers.
316Ti is highly weldable, P number 8 grouping with 316 for procedures. Fillers prevent sensitization; no PWHT needed.
Gangsteel's 316Ti SA240 Type 316Ti pairs with ER316L.
316Ti's P number suits chemical piping (welded with ER316L), marine fittings (E316LT for outdoors).
In Gangsteel's supply to U.S. pharma, 316Ti welded without IGC.
Equivalents: EN 1.4571 (P8 equivalent). For A240 GR 316Ti, P number matches.
Gangsteel stocks 316Ti at $3,200-3,800/ton FOB. 1-200mm thick, ASME SA240 certs with filler recommendations. Contact for P number data.
Q: What is the P number for 316Ti stainless steel?
A: The P number for 316Ti (UNS S31635) is 8 (Group 1) per ASME Section IX, grouping it with austenitic SS like 316L for welding qualifications.
Q: What welding filler wire is recommended for 316Ti?
A: Recommended fillers for 316Ti include ER316L (solid wire) or E316LT (flux-cored) for general use; ER316Ti for matching Ti stabilization in high-temp welds.
Q: What is the difference between ER316L and ER316Ti filler wire for 316Ti?
A: ER316L is low-C for general corrosion; ER316Ti adds Ti (0.5-0.7%) to match 316Ti's stabilization, preventing IGC in heat-affected zones.
Q: Is preheat required for welding 316Ti stainless steel?
A: No preheat needed for 316Ti in thin sections; 100-150°C for thick (>20mm) to reduce cracking, per ASME Section IX P8 guidelines.
Q: What is the A number for 316Ti welds?
A: The A number for 316Ti welds is 8, indicating austenitic composition with Cr-Ni-Mo-Ti, per ASME Section IX.
Q: How does heat treatment affect welding of 316Ti?
A: 316Ti requires no post-weld heat treatment due to Ti; annealing at 1050-1150°C if needed restores microstructure.
Q: What standards govern P number and filler for 316Ti?
A: ASME Section IX for P number; AWS A5.9/A5.4 for fillers like ER316L, aligned with ASTM A240/A240M base material.
(Word count: 1,523. Original content from Gangsteel's expertise. For 316Ti stock, contact us—P8 welding solutions ready.)
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