Consumable & PWHT for 16Mo3 material

[Sudalai Kannan]

Greetings Experts,

I would like to know more about PQR qualifications for Boiler tube material EN 10216-2 16Mo3 or SA 209 T1 with 6.5mm Thick,

Welding Consumable: Should  I qualify the above material with ER80S-B2/ E8018-B2 or ER80S-D2 / E7018-A1, or which consumable is suitable for high temperature service like Boiler.

PWHT: As per ASME SEC.I & VIII PWHT is not mandatory for P. No.1 Gr.1 up to 16mm Thick and the Boiler tube and weld joints will undergo the Stress Relieving after tube bending as a coil. in this case Should i qualify the PQR with PWHT or Without PWHT.

[Amol Betkar]

Dear Sudalai,

PQR (Procedure Qualification Record) for Boiler Tube Material

For the given materials EN 10216-2 16Mo3 or SA 209 T1 with a thickness of 6.5mm, it's important to consider the appropriate welding consumables, the need for Post Weld Heat Treatment (PWHT), and compliance with relevant standards to ensure the reliability and performance of the welded joints, especially in high-temperature service conditions like those found in boilers.

Welding Consumables

Material Overview:

• EN 10216-2 16Mo3: This is a European specification for seamless tubes of fine-grain steel with specified elevated temperature properties.
• SA 209 T1: This is an ASME specification for seamless carbon-molybdenum alloy-steel boiler and superheater tubes.

Recommended Welding Consumables:

• ER80S-B2 / E8018-B2: These consumables are suitable for welding low alloy steels containing 1.25% Cr and 0.5% Mo, typically used for high-temperature service. They provide good creep resistance and strength at elevated temperatures.
• ER80S-D2 / E7018-A1: These consumables are typically used for carbon-manganese and carbon-molybdenum steels. E7018-A1 is a low-hydrogen electrode suitable for general welding applications but may not provide the necessary high-temperature properties required for boiler tubes.

Considering the service conditions (high temperature) and the material composition, ER80S-B2 / E8018-B2 would be the preferred choice for welding 16Mo3 and SA 209 T1 materials due to their enhanced high-temperature performance.

Post Weld Heat Treatment (PWHT)

Code Requirements:

• ASME Section I & Section VIII: These sections cover the construction of boilers and pressure vessels. For P-Number 1, Group 1 materials, PWHT is not mandatory for thicknesses up to 16mm.

Practical Considerations:

• Stress Relieving after Tube Bending: If the boiler tubes and welded joints will undergo stress relieving after tube bending, this process itself serves as a form of PWHT. Stress relieving can help reduce residual stresses and improve the metallurgical properties of the welded joints.
• Qualification with or without PWHT: Given that stress relieving will be performed after tube bending, you may qualify the PQR without PWHT. However, it is crucial to simulate the actual service conditions during qualification. If stress relieving (acting as PWHT) is a part of the production process, it's recommended to qualify the PQR considering this process to ensure the welding procedure aligns with the final product conditions.

Conclusion

1. Welding Consumable Selection: For high-temperature service like boilers, ER80S-B2 / E8018-B2 consumables are suitable for welding EN 10216-2 16Mo3 and SA 209 T1 materials.
2. PWHT Requirement: Since the boiler tubes and weld joints will undergo stress relieving after tube bending, which serves as a form of PWHT, you may qualify the PQR without PWHT. However, it is advisable to ensure the PQR qualification reflects the stress relieving process to simulate actual service conditions.

By adhering to these guidelines, you can ensure the welds are properly qualified and suitable for the high-temperature service conditions typical in boiler applications.

Regards,

AB

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Best regards,

Amol K.B

B.E(Mech), CSWIP 3.2.2, NACE CIP 1 & ASNT LII(4M)

[Sudalai Kannan]

Dear Amol, 

Thanks for your prompt reply.

I Agree with your conclusion for the welding consumable and I will proceed with the PQR for ER80S-B2 / E8018-B2.

I would like to know more about PWHT for P No.3 G.1 or Equivalent since it is required to stress relieve only the bend portion as per construction code, whereas in my case the weld joint may or may not undergo stress relieving.

As long as the SR is performed in the furnace, the whole coil with weld joint will undergo the process. if the SR is performed in localized only the bend portion will undergo stress relieving.

In some cases, SR is performed on the bend portion of a tube before welding so that coil manipulation can be performed.

Considering the above scenario and providing your feedback, I personally prefer to qualify PQR with and without PWHT to avoid conflict.

 Thanks and regards,

  Sudalai. M

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