Vulcan entered the long bar quench and temper market and now the Heat Treating division is the largest long bar, induction heat treater in the world with annual. Caution: All material included in this chart is advisory only, and its use by anyone is voluntary. In developing this information, Fastenal has. Esparragos #B7 #Cadmiados #Fluorocarbonados #Galvanizados #Quito # Ecuador [email protected]

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Hello, Please tell me about use B7 and B7M which one and for what, for instance in a valve. Hi, please let us know what is the difference between A and A However, I find some contradicting answers when searching around, can it be both depending on the heat treatment and consequent microstructure?

Your advise would be much appreciated. Jayant- B7 and B7M bolts are chemically identical, so they would both have the same corrosion resistance, which is negligible. If not which is the suitable bolt material A Gr.

However B7 and B7M bolts re not mechanically identical. What standard is the nut compatability chart listed on your website pulled from? The downside is that the shallow threads are more susceptible to damage and thread stripping in some situations.

Any substitution should be run by an engineer. There are some differences between the two.


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Regardless, the hardness testing should be completed after the final heat treatment. I see no issues using the same bolting material to make washers for use here. Vijay- Of those, A B7 is the closest to grade 8. There are some significant differences in both the mechanical properties and the testing requirements of AB7M and AB7.

It is usually used in higher temperature applications. What can be the risks if we accept it as is?

We have a valve with Grade B7 bolts that need to be change out, we will need longer bolts when going back together. Islam — You would need to get approval from the project engineer to change bolts.

While as per clause 6. We are esparrags familiar with a bolt specifically called a mushroom head. You will need to consult with the project engineer. Leave this field empty. It is made from alloy steel which is a ferritic steel. What is the heat treatment process of astm a grade b7m??? The design temperature of the tank is 85 deg C only.

Your email address will not be published. Why Grade B7M shall have a line under the grade symbol?

Esparragos ASTM A193 Gr. B7, ASTM a 193 Grado B7 Esparrago, Stud Bolt

If the purchaser requires indentation testing, he must specify 3. The A nut chart we created based on common industry practices. May you help me about material specifications… I have a problem about material MS Class 1 refers to lower strength materials whereas class 2 refers to higher strength, strain hardened material.


Osama- We are sorry, but we are not familiar enough with the requirements of sanitary lifting stations to know if B7M bolts are allowed. Nitin — There are several differences, too many to list here. You can find summaries of both standards espzrragos our website. Same as baking a cake — if it is large, the center never gets completely done.

It is up to the designer or engineer if they are required or not. Leave a Reply Cancel reply Your email address will not be published. As for why the larger bolts are 8tpi, the threads are more shallow than their UNC counterparts, which creates a larger espsrragos root area. It will depend on how they are being used and what the engineer designed for. Sohrabmohammadi — Yes, both of those grades of fastener can be hot dip or mechanically galvanized.

Mehul — We do not heat treat in house, so you will need to contact a heat treat facility to get specifics about their process.