Material 10.9 and ISO V Impact Test

[bulldogwld]

Hello, I am new to the steel machining industry, came across a specification on a print and I am asking for help to better understand the details.

Specification is:
Material 10.9
ISO - V Impact test result at -40C should be:
- average value of 3 samples greater than 27J
- minimum value greater than 70% of average value
3.1B certificate

What do each of the line items mean?

 

[Goahead]

10.9 is not a recognizable material specification unless in the context of bolting materials.
Are you speaking of acceptance requirements for hardware material?
Are you referring to EN 10204 specification?
Details would help.

http://www.welding-advisers.com/

 

[bulldogwld]

The 10.9 is for a bolt.
I think you are correct that it refers to EN 10204

 

[TVP]

Your customer is asking for Property Class 10.9 bolts according to ISO 898-1 plus some additional requirements. ISO 898-1 only requires Charpy U-notch testing at ambient temperatures, but your customer is asking for Charpy V-notch testing (ISO 148-1 or ASTM E 23) at -40 C. ASTM A 320 is a standard for low temperature bolts that has a similar requirement; I am not aware of an equivalent ISO standard. The customer is also requesting an official certification according to EN 10204-3.1B. You will need to work with your steel supplier in order to document that the bolts meet these requirements. FYI, these bolts will require a high quality steel grade in order to meet this requirement, and should have rolled not cut threads.

 

[bulldogwld]

thank you for your help