ASTM A1011 grades versus other materials that are very weldable, forming, and fatigue resistant

[Dust Man]

I have an application where we are now using ASTM A1011 CS Type A or B. However, we need a material that is easily formed, easily welded, but has the strength and fatigue resistance to withstand continuous medium frequency vibration and continuous flexing due to low pressure pulses. This application is a housing that utilizes a vibrator that is turned on periodically and sequenced pulse pressures of less than 1 psig. Since ASTM CS Type A or B is a low cost sheet metal material, I need to find a material that does not cost much more or equal. Does anyone know the best choice between these materials below and which may best fit my application?

ASTM Specification​

A36 plate

A1011 CS type A

A1011 CS type B

A1011 SS grade 30

A1011 SS grade 33

A1011 SS grade 36 type 1

A1011 SS grade 36 type 2

A1018 CS type A&B

A1018 SS grade 30

A1018 SS grade 33

A1018 SS grade 36 type 1

A1018 SS grade 36 type 2

 

[Dhurjati Sen]

You do not have a design / engineering team? This is not the way to specify or substitute a material.

 

[Dust Man]

Dhurjati Sen.
Thank you for your response, however I am not sure what you are suggesting. I was just trying to find out if some of the material experts knew more about these materials in application to help guide me to a common material that fit my application. Not everyone has resources that will do a good job telling me what I need to know, which is actual experience with these particular materials and how they react in manufacturing (welding and bending) and fatigue applications. From my analysis, I believe that ASTM A1011 SS grade 36 type 1 and ASTM A36 is the direction to go with a possible substitution with ASTM A1011 SS grade 33 or A1018 SS grade 36 type 1 or A1018 SS grade 33.
If anyone has a productive comment, I would be very grateful.

 

[EdStainless]

You need to be concerned about both strength and ductility.
Many of these materials are lower priced, but in return you get highly variable properties.
Ease of supply, low price, reliable material; pick any two because you can't have all three.

 

[Dhurjati Sen]

Dear DustMan,
What I meant exactly were as follows:
1. There should not be a material diversity in your application, like you are using both CS and SS, which could lead to Galvanic Corrosion.
2. The corrosion behaviour of the product that would flow through the CS or SS application needs to be ascertained.
To assess the above, in addition to mechanical strength calculations and weldability, I suggested you to refer the issue to the deaign / engineering team.