Modified ASTM 182 F22 materials

[Ratheesh_n]

Dear All,

We are procuring a valve. The material used is ASTM 182 F22. The material is having higher tensile strength , yield strength and hardness than normal F 22 materials. So is it acceptable?
And test certificate of this material will be certified as ASTM 182 F 22 ..will mention as modified . Is it acceptable

Regards,

Ratheesh N

 

[metengr]

There is no modified F22 in material specification ASTM A 182. You have Class 1 and Class 3 for F22 regarding strength and hardness. Regarding strength, there are no maximum requirements, only minimum requirements. The hardness for Class 1 is a maximum at 207 and for Class 3 is 156 to 207 Brinell.

 

[davefitz]

"modified" in what sense? Do the chemical constituents meet ASTM A 182 spec? As it is forged, were the mechanical properties recorded after work hardening?

"...when logic, and proportion, have fallen, sloppy dead..." Grace Slick

 

[weldstan]

If the mechanical properties and chemical requirements meet A-182 F22, it is stamped accordingly. If it does not meet all the requirements of the spec, it cannot be so stamped or stamped as F22 "modified".

 

[EdStainless]

Under the ASTM system you meet all of the spec requirements to certify the item, no exception only additions.
Does this spec have a max hardness, max strength, min elongation? Does the material meet these? If so then it meets the spec.

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P.E. Metallurgy, Plymouth Tube