Replies to This Discussion

Permalink Reply by stuart anderson on March 23, 2010 at 10:44am

Hi Colin. Got that one too, but it doesn't state Wet Welding anywhere. I think it's Deck welder on a Trenching /ROV barge. RQT is a kind of Hardened Steel as far as I know.

To Dive in Dutch waters you need to have a Dutch conversion of your Diving ticket (If you trained after 1998). I've heard that this conversion is being challenged in court as it is just a rubber stamp and 300euro.

That's all I needed to do Sat there last year. I've heard of 'safety Passports' and other tickets, but never seen one. If you are working for a Dutch company, they can usually smooth things out for you if they need you

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Permalink Reply by Bill Gardner on March 23, 2010 at 11:43am

Roger that Stu, the other thing that snuck in is now you must have a Dutch medical every 12 months worked in Dutch territory....

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Permalink Reply by Fish_food on March 23, 2010 at 2:23pm

Plates for offshore structural applications are
manufactured by Corus with three different delivery
conditions:
1. normalised
2. thermomechanically controlled rolled (TMCR)
3. roller quenched & tempered (RQT)

Here's a link for more info.

http://www.corusgroup.com/file_source/StaticFiles/Business%20Units/...

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Permalink Reply by Fish_food on March 24, 2010 at 12:32pm

Hi Dale

I'm no expert but this is what I could find;

Higher strength plates are delivered in the roller
quenched and tempered condition. RQT steel plates are
produced by heat treating high quality reversing mill
plates of the required chemical composition and
thickness rolled from continuously cast slabs or direct
rolled ingots of low sulphur steel.
The heat treatment of the plates takes place at Corus
Clydebridge Works. The plates are heated to a
temperature, depending on grade, in the range 880°C to
930°C and then water quenched using a Drever Roller
Pressure Quench unit. The plates are quenched at very
high cooling rates by large volumes of high pressure
water sprayed across the full width of the plate on to
both top and bottom surfaces. During the quenching
operation the plates are held flat and are in continuous
motion, thus ensuring that each part of the plate is
cooled at the same rate. The precise rate of cooling
during quenching is achieved by controlling the water
pressure and the speed of passage of the plate through
the unit, allowing consistent properties to be achieved
in the final product. The quenching efficiency of this
process is extremely high, giving the desired properties
with very low levels of microalloying elements and low
levels of CEV.
The final levels of strength and toughness are achieved
by tempering heat treatments performed in furnaces
with uniform temperature distribution and close
temperature control. Using this method, plates
satisfying grades requiring nominal yields of 420 MPa,
450 MPa and 460 MPa can all be produced from steel
slab or ingots of similar target compositions.

TESTING;

A full range of testing facilities are available within
Corus at which the standard testing requirements of
each specification are undertaken. Further specialist
testing can be undertaken as necessary at one of the
Corus Technology Centres.
Non-destructive testing (NDT) facilities are available inhouse.
When specified, testing is carried out by NDT
operators who are certified in accordance with EN473.
The NDT facility can be incorporated into the 100%
inspection process, an offline activity for checking the
product conformity to the standard applied. This
inspection service is operated in a dedicated bay by
teams of experienced steel inspectors ensuring a high
level of service and a quality product.
Certification
Corus certification is in accordance with EN10204.
Inspection certificates are normally supplied to Type
3.1.B although at the customer’s request other
certification can be supplied, e.g. Types 3.1.C, 3.2 and
3.1.A. Certificates are available in English, French and
German.


I hope this helped you out.

FF

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Permalink Reply by Colin Connor on March 24, 2010 at 8:45pm

Yea, it looks Corus is the top dog when it comes to RQT steels. It seems as if they are the only ones producing roller quenched and tempered steel for the offshore industry..
The job is for a topside welder, and the only ways to get 'an RQT CERT' is to have already welded the stuff on a job and been coded in the field.. OR call into the Corus centre and sit the weld exam and get signed off in your logbook that way.. Not very cost effective for a diver living in Thailand.. because once you may/may not pass the exam, you still have no working expirience welding the stuff! and its only to submit and application for the job, no guarantees you'll see a return on your investment!
Having said that, very interesting stuff, and it would be nice to get more up todate on my welding certs, as its a good way to earn pay when your not diving!
cheers everyone, thanks for your input and info!

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Permalink Reply by Joseph on March 25, 2010 at 1:01pm

It is not just "offshore".

In the US most major construction projects are requiring "Certifications", for just about everything.

The future is A****sment, Qualification, Certification.

Those that are Qualified and Certified will be employed first!

Those that are not will wait.

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Permalink Reply by Fish_food on March 25, 2010 at 12:34pm

Hi Dale

Just like you, I was curious and looked it up on the net and copied it. I think everybody on this thread now knows in general what RQT steel is and what it's used for.
Cert-wise offshore is getting beyond imagination. Pretty soon if you want to take a crap offshore you'll have to do a course and get certified.

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