Hardness Value

[Krish QA]

Dear Experts

our project specification requirement for hardness of structural tubular is 325 HV10 (Maximum) But the manufacturer provided test certificate of 325 HV5 (Maximum) and all the values found below 325.

1.    Is it Acceptable HV5 in the place of HV10?

2.    Is there any conversion method to conversion method to convert HV5 to HV10?

Thanks & Regards

Krish

 

[meisam shokri arfaei]

Dear friend

When we speak about the method, e.g. HV or HB, basic differences occurred in the test procedure, but when we assume the load there is just a difference in the applied load. In general and equal condition you must have equal values for HV5 kg and HV10 kg. The original matter that we select a load is the material microstructure. In some cases these differences in microstructures lead to great differences in hardness values. So there is no table for converting the values because the error is not systematic. Always in similar cases it is recommended that test re-done in the desired load.

Regards

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M. Shokri Arfaei

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[Pieper QSI]

Dear Krish,

 

In general you will find higher hardness values with HV5 method compared to HV10 because smaller part of the microstructure is measured. Therefore if hardened structures like martensitic and/or bainitic are present in the Coarse grain area / heat affected zone you will have the risk that a measurement is executed on a hardened structure only in case of HV5 where HV10 measures a larger area by which the maximum hardness measured will become a little bit lower.

Therefore you can accept HV5 measurements without any doubts if they are below the required 325 HV.

 

Met vriendelijke groeten / Best Regards,

 

Herman Pieper

QA-QC Inspector / IWI-C Welding Inspector / IWT / Materials Expert

 

Job van der Havestraat 6

8384 DB, Wilhelminaoord

Cell: +31 6 51691215

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[Krish QA]

Dear Herman

Thanks for your reply now i am clear....

Best Regards

Krish

On Monday, October 21, 2013 4:26:10 PM UTC+5:30, hpi001 wrote:

Dear Krish,

 

In general you will find higher hardness values with HV5 method compared to HV10 because smaller part of the microstructure is measured. Therefore if hardened structures like martensitic and/or bainitic are present in the Coarse grain area / heat affected zone you will have the risk that a measurement is executed on a hardened structure only in case of HV5 where HV10 measures a larger area by which the maximum hardness measured will become a little bit lower.

Therefore you can accept HV5 measurements without any doubts if they are below the required 325 HV.

 

Met vriendelijke groeten / Best Regards,

 

Herman Pieper

QA-QC Inspector / IWI-C Welding Inspector / IWT / Materials Expert

 

Job van der Havestraat 6

8384 DB, Wilhelminaoord

Cell: +31 6 51691215

 

Van: material...@googlegroups.com [mailto:material...@googlegroups.com] Namens Krish QA
Verzonden: maandag 21 oktober 2013 11:06
Aan: material...@googlegroups.com
Onderwerp: [MW:19018] Hardness Value

 

Dear Experts

our project specification requirement for hardness of structural tubular is 325 HV10 (Maximum) But the manufacturer provided test certificate of 325 HV5 (Maximum) and all the values found below 325.

1.    Is it Acceptable HV5 in the place of HV10?

2.    Is there any conversion method to conversion method to convert HV5 to HV10?

Thanks & Regards

Krish

 

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