ERNiCr3 Vs ERNiCrMo-3 for UNS N08810 welding

[PARAI Reaction Channel]

Dear Sirs,

Please confirm the following weld details for my below 2 queries.

We have a tube to tube welding , in which the material is SB407 UNS N08810 ( P No. 45 ) and the design temperature is about 800 Deg C.

1) Can we use either ERNiCr3 GTAW weld rod Or ERNiCrMo-3 considering the above design temperature for UNS N08810, without having metallurgy issues , cracking etc?

Or which is the best suitable AWS class GTAW rod to withstand 800 Deg C for this weld?

2) To weld dissimilar materials , that is SB407 UNS N08810 ( P No. 45 ) to A312 TP 321H ( P No. 8 ), can we use ERNiCrMo-3 for a design temperature about 800 Deg C ?

Please give me some advice.

Best regards,

Saravanan Sornam,

Ansan-si,

S.Korea

[Ch Bilal jovinda]

Dear Parai,

     ERNiCrCoMo-1 can be used up to 982 degree centigrade as per para 6.3 and table-3 of API 582.

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[sridhar cn]

For high temp. services ERNiMCrMo-3 (with higher levels of Cr-20-23% & Mo 8-10%) is better than 

ER Ni CrMo-1 and ERNiCr3 as it maintains its mech. properties and strength at elevated temperatures 

and making it ideal for corrosion environments that require durability under thermal stress. It can withstand 

temps. up to1000 deg. C while Mo-1 is less specified for extreme heat conditions.

ERNiCrMo-3 is suitable to weld P45 to P8 due to its compatibility with Aust. stainless steels. It provides  

good resistance and mech. properties.  ER NiCrMo-4 can also be used if higher strength is required at elevated

temperatures. Ultimately, the choice may depend on specific service conditions.

Sridhar.

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[Kannayeram Gnanapandithan]

Use NiCr3 or NiCrCoMo1.  (Inconel 625 Will be subjected to second hardening effect when it is exposed at this tem for longer periods. )

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