IGC Testing requirement in SS410S.

[Ronak Patel]

Dear Experts ,

We are using SS410S CLAD in Coke Drum at 450 degree temp.

Is IGC test required for SS410S material ? at present there is no requirement of IGC testing for SS410S in coke drum cladding in industry .

 As per my understanding, IGC happens in ferritic SS as well if they are exposed to high temp(450 in my case) in operation , welding or PWHT. So why SS410S is not tested for IGC as per A763 ?

How IGC is different in ferritic SS than in Austenitic SS ?

Thanks and Regards,

Ronak Patel.

[Vishwas Keskar Welding Manager WELDING]

Dear Ronak 

The  410S  material is basically a Martensitic Stainless steel .The  microstructures is  not prone to Sensitization .

ASTM E 262 - Austenitic

ASTM E763 - Ferritic grade 

So it is not covered under either E 262 OR 763.

410S has lower Carbon so the hardness is moderate 

As per my opinion , the MOC is being selected in view of primarily because of elevated temperature Service and not for corrosive media ( the corrosion medium could be a mild corrosive media ). Also it has more erosion resistance at elevated Temperature . 

Pl. discuss with your Process Specialist and discuss about Service Environment .  Corrosion testing is not required . 

The Erosion resistance at certain operating temperature is a primary objective .

Thanks and regards

Vishwas -IWE

International Welding Engineer 

[james gerald]

SS 410S is Ferritic stainless steel with a maximum carbon of 0.08%.

SS is prone to IGC or sensitization if exposed in the range of temperatures 450-650 degC.

1. Check whether the Base material is subjected to tempering in the temperature range prone to IGC.

2. Since carbon is less in 410S the formation of Cr23C6 is restricted and not prone to IGC during welding.

3. The only problem associated with welding is Grain coarsening in HAZ and can be prevented by controlling welding parameters to promote fast cooling and hence it is cooled faster in the IGC range.

4. Since ferritic stainless steel is prone to 475 DegC Embrittlement and hence service temperature may not exceed 350-400 degC

Thanks & Regards

J.Gerald Jayakumar

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[james gerald]

Please check the Design/operating temperature of 410S

Thanks & Regards

J.Gerald Jayakumar

On Tuesday, 20 June, 2023 at 08:47:18 am IST, Ronak Patel <patelr...@gmail.com> wrote:

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[Ronak Patel]

Thank you for your response!!

W.r.t point no 2 above :- Carbon Percentage in SA240 SS 304 is 0.07 , in SA240  SS410S is 0.08 .. We do IGC testing for SS304 after welding so why not for SS410S ? it too has almost same carbon . 

w.r.t point no 4 above :- Operating temp for one of our coke drum was 460-500 degree but even in that case licensor did not mention IGC requirement for SS410S Clad + LAS Base material.

[Manisha Sahu]

Hello Ronak,

As mentioned by vishwas sir,  This is not more related to carbon percentage but the apparent microstructure.

 As mentioned SS410 S mainly believed to have martensitic structure which is not relavnt to grain distribution which is observed in inter granular corrosion practice where the susceptibility of materials to be checked by attacks of carbon at grain boundaries.

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[Zeghanu Gigi]

Guys,

SS 410S is ferritic SS or Martensitic SS?

See attachment.

Regards

Gigi

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[james gerald]

Just to share,

A snap shot from ASME B31.3 

Notes 35 & 50

Thanks & Regards

J.Gerald Jayakumar

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.

[james gerald]

The only difference between 410 & 410S is carbon except very slight variation in Nickel. See below snap shot. Single value shown is maximum but in the MTC it will 0.03-0.04%.

Carbon expands the Austenitic zone and that is the reason why Martensite is formed due to transformation.

Thanks & Regards

J.Gerald Jayakumar

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[Vinay]

Dear Ronak :

Austenitic steels ( non L grade) are typically prone to sensitisation when subjected to temperature range of say 400 to 800 mdeg C and remained for a sufficient time at this temperature . Chrome and carbon present in IGSCC plays a major role .    

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[Mostafa DAIF]

Dear all,

410 and 410S are two different stainless steel grades with distinct compositions, properties, and applications. Here are the primary differences between them:

1. Composition:

- 410 stainless steel is a martensitic stainless steel grade, with approximately 11.5-13.5% chromium content, which provides a decent level of corrosion resistance. It also typically contains a small percentage of carbon (0.15% max).

- 410S stainless steel is a modified version of 410, with a lower carbon content (0.08% max). The lower carbon content helps to improve the material's weldability and prevents hardening when heated.

2. Properties:

- 410 stainless steel exhibits higher hardness and strength, due to its higher carbon content. It can be hardened and tempered through heat treatment to achieve better mechanical properties.

- 410S stainless steel has lower hardness and strength compared to 410, due to its lower carbon content. Although it cannot be hardened through heat treatment, it is more ductile and has better formability and weldability than 410 stainless steel.

3. Corrosion resistance:

- 410 stainless steel's corrosion resistance is moderate and depends on the material's heat treatment and surface finish. It typically performs well in mildly corrosive environments but may show reduced resistance compared to more corrosion-resistant stainless steels like 304 or 316.

- 410S stainless steel has slightly better corrosion resistance than 410, due to its lower carbon content. Its pitting and crevice corrosion resistance is also modest, making it suitable for mildly corrosive environments.

4. Applications:

- 410 stainless steel is used in applications that require moderate corrosion resistance, high strength, and hardness. Some common examples include cutlery, valve components, pump parts, fasteners, and turbine blades.

- 410S stainless steel is used in applications where weldability, ductility, and corrosion resistance are more critical than high strength and hardness. Typical uses include annealing boxes, heat exchangers, chemical processing equipment, and automotive exhaust systems.

Overall, the main difference between 410 and 410S lies in their carbon content, which affects their strength, hardness, weldability, and corrosion resistance. The choice between the two grades depends on the specific requirements and operating conditions of the intended application.

Best regards,

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