difference b/w L7 and B8 bolts 1

[hassmx0f]

Dear Experts

what is the difference between ASTM A320 L7 bolts and ASTM A320 B8 bolts. can these two be installed instead of each other.

Thanks

 

[metengr]

No, they are not interchangeable grades and what is the difference? Have you even a copy of the referenced ASTM A 320 material specification? If not get a copy and you will see the obvious differences between a L7 quenched and tempered bolt grade and B8 austenitic stainless steel bolt grade.

 

[HBMetals]

Of course they are not interchangeable. Both L7 and B8 bolts are applicable to low-temperature service. However, L7 is a Cr-Mo low alloy steel while B8 is a stainless steel(SS 304). L7 is recommended for temperatures above -73℃ while B8 for temperatures above -255℃(such as Liquid Natural Gas and Liquid Nitrogen services).

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Hebei Metals Industrial Limited

http://www.hbmetals.com

 

[boo1]

Portland Bolt has some of the bolts properties

http://www.portlandbolt.com/technical/specifications/astm-a320/