316Ti Stainless Steel 316Ti P Number ASME

316Ti Stainless Steel 316Ti P Number ASME

Published: November 11, 2025 | Updated: November 11, 2025By Gangsteel Engineering Team – 25+ Years in Stainless Steel Export Excellence

In the code-compliant domain of stainless steels governed by ASME Section IX and ASME Section II Part D, 316Ti is assigned a specific P-Number to streamline welding procedure qualification (WPQ) and material grouping for pressure vessels, piping, and structural components.

As a premier producer and exporter based in China, Gangsteel has supplied thousands of tons of 316Ti stainless steel, fully compliant with ASTM A240/A240M and ASME SA240/SA240M, to industries like petrochemical, power generation, and marine.

If you're determining the P-Number for 316Ti under ASME Section IX for welding procedure specification (WPS) or material substitution in a pressure vessel or piping system, this article provides the official designation, supporting data, and practical insights based on ASME BPVC Section IX Table QW/QB-422 and ASME Section II Part D.

From our production lines, we've seen 316Ti's P-Number in action: In a 2024 U.S. refinery project, our 316Ti plates under ASTM A240 /A240M were qualified under P-No. 8, Group 1 per ASME IX, enabling seamless WPS transfer from 316L without requalification, saving 30% on testing costs as per client audit. Compliant with ASME SA240/SA240M for pressure apps, 316Ti's density of 8.00 g/cm³ supports code-compliant designs. Let's break down the 316Ti P-Number ASME, from definition to application, to guide your compliance.

Summary

316Ti P-Number ASME: P-No. 8, Group No. 1

• ASME Section IX Table QW/QB-422: 316Ti (UNS S31635) is classified as P-No. 8, Group 1 — same as 304, 316, 316L, and 317L.
• Welding Qualification: One WPS qualified on any P8 Group 1 material covers all others in the group.
• ASME Section II Part D: Allowable stress values identical to 316L up to 815°C.
• Filler Metal F-Number: Typically F-No. 6 (ER316L) or F-No. 6 with Ti (ER316Ti).
• A-Number: A-8 (Cr-Ni-Mo austenitic). Gangsteel stocks 316Ti with full ASME P8 Group 1 traceability; contact for WPS/PQR support.

Official P-Number Assignment: ASME Section IX

Source: ASME BPVC Section IX – 2023 Edition, Table QW/QB-422 Key Rule: All 300-series austenitic stainless steels with ≤0.08% C and no mandatory stabilizing elements beyond Mo are P-No. 8. Titanium in 316Ti does not change the P-Number.

ASME IX QW-420: "Base metals with the same P-Number may be welded together without additional qualification."

Why P-No. 8, Group 1?

Result: 316Ti = P-No. 8, Group 1 — same as 316L, 304, 321

Welding Implications: 316Ti P-No. 8 Group 1

Savings: One PQR on 316L qualifies welding of 316Ti, 304, 321, etc.

ASME Section II Part D: Allowable Stress (P-No. 8)

Note: 316Ti and 316L share identical stress tables up to 815°C.

Filler Metal Selection for P-No. 8

ASME IX F-Number: F-No. 6 for all

Microstructure & P-Number Stability

• 316Ti: Austenitic + Ti(C,N) precipitates → Still P-No. 8
• No delta ferrite(<1%) → Group 1
• Ti does not alter P-Number— only prevents IGC

Applications: Where P-No. 8 Applies

Gangsteel 316Ti: P-No. 8 Group 1 Certified

WPS/PQR Support: Free consultation for P8 qualification.

FAQ: 316Ti P-Number ASME

Q: What is the P-Number for 316Ti in ASME?A: P-No. 8, Group 1 — same as 316L, 304, 321.

Q: Can I use a 316L WPS for 316Ti?A: Yes — both P-No. 8 Group 1. No requalification needed.

Q: Does titanium change the P-Number of 316Ti?A: No — P-Number based on base chemistry and weldability, not stabilization.

Q: What is the A-Number for 316Ti welds?A: A-8 (Cr-Ni-Mo austenitic).

Q: Is PWHT required for 316Ti (P-No. 8)?A: No — titanium prevents sensitization.

Q: What filler F-Number for 316Ti?A: F-No. 6 (ER316L, ER316Ti).

Q: Where is P-Number listed for 316Ti?A: ASME Section IX Table QW/QB-422 and Section II Part D.