UHSS/Boron/Martensitic

Good afternoon all,

It seems to a very long time since I checked in.

Whats happened recently?

Onsite ATA AOM's have taken off with all of our first 3 candidates passing and renewing ATA's with one candidate changing from NVQ to ATA panel.

We attended the Ford Impact Conference, where much interest was shown for your onsite sill section testing. We also ran a Mario Kart Fastest lap, which was a great success the winner taking home a trophy and an ipod shuffle.

On my travels in these last few week I have heard some confusion on material type, whats what how things works and react.

What is UHSS?

Ultra High Strength Steel.

Is Ultra High Strength Steel a steel type? simply NO!

UHSS is a working group with sub categories, this is where Boron, Martensitic and too many more to list fall into. I keep being asked whats the difference between UHSS and Boron my answer is always NOTHING, It's a sub group. 

Steels are divided into four groups according to their tensile and yield strength, that is to say the force necessary to bring about plastic deformation of the material.

Plastic deformation Definition (Permanent change in shape or size of a solid body without fracture resulting from the application of sustained stress beyond the elastic limit.)

How the working groups work.

SS        Soft Steel                              Maximum Yield Point of 220 Mpa

HS       High Strength Steel                with a yield point of        220 – 450 Mpa

EHS     Extra High Strength Steel       with a yield point of        450 – 800 Mpa

UHS    Ultra High Strength Steel        with a yield point of        800 – 1600 Mpa

Boron and Martensitic have an Mpa rating of 1200 with means they fall into the same working group. Meaning they have the same characteristics and worked in the same ways, these are high carbon press hardened steels.

The average car is made of around 27 different types of steel all will fall into one of the above working groups Example High Strength/Bake Hardened/Carbon Manganese/Interstitial Free have a yield point of between 300 and 450 Mpa all falling into the the HS/ High Strength Group.

I hope this clears up some of the myths.

Feel free to fire any questions over to me via email andy@rpmwelding.co.uk our online chat on www.rpmwelding.co.uk 

 

Regards

Andy