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Re: [MW:6141] HSLA Welding.

By Materials & Welding

Dear Limesh,

 

 

HSLA Steels are Microalloyed Steels formulated with small amounts of some alloying elements ( Niobium Nb, Vanadium V & Aluminum Al )to provide higher strength, better toughness & Weldability and in some cases greater resistance to specific corrosion mechanisms in specific environments than Ordinary Carbon Steels.

 

Usually used in as rolled or Normalized Conditions & rolling process is integrated in developing final Mechanical Properties.

Special rolling practices such as Controlled Rolling known as Thermo Mechanical Controlled Processing TMCP had been devised for enhancing Mechanical & Metallurgical performance for this category of steels.

 

Typical Yield Strengths range is 40 up to 110 Ksi  & Typical Tensile Strengths range is 60 up to 120 Ksi .

 

Common Grades on API are: 5L Gr X 60,X 70 & X 80.

Common Grades on ASTM are : A 353 , A 735 & A 736

 

I believe that both HSLA 65 & API X65 are the same.

 

Some Precautions to be taken during welding :

 

1-Preheat to be used based on Thickness, Carbon Equivalent & Welding Process…..

2-Low Hydrogen Practices (Proper cleaning, packaging for fillers & avoid any Hydrogen Contamination sources )

    to be followed with ARC Welding Processes ( Gas shielded Arc Processes GTAW,GMAW or PAW  are Preferred rather than Slag Shielded Processes SMAW,SAW or FCAW ).

3-Cellulosic Electrodes can be used with some API Grades ( Low Carbon Content Grades ).

 

 

Thanks & Regards

Mohamed.Hegazy

QA QC Welding Engineer

AWS Certified Welding Engineer CWEng.

TWI CSWIP Welding Inspection 3.1.

VSA Consortium ( VEOLIA, SAIPEM & Aljaber )

QATAR SHELL PEARL GTL Project
Ras Laffan ,Qatar

 

QATAR :  +9743694501 

EGY:       +20142345614

Email       : MH_W_Inspect@Yahoo.COM 


--- On Tue, 7/27/10, Ali Asghari <asghariali@rocketmail.com> wrote:


From: Ali Asghari <asghariali@rocketmail.com>
Subject: Re: [MW:6139] HSLA Welding.
To: materials-welding@googlegroups.com
Date: Tuesday, July 27, 2010, 9:32 AM

these steel are refinement by adding microalloys such V,Al,Nb,Ti & thermo mechanically heat treatment to increse toughness & strength simultanously.
HY-80,HY-100 & X-100 are examples of these steels.
during of welding of these steels, the minimum H.I SHALL BE USED to prevent growth grain.

From: limesh M <limesh78@gmail.com>
To: Materials & Welding <materials-welding@googlegroups.com>
Sent: Tue, July 27, 2010 10:15:16 AM
Subject: [MW:6137] HSLA Welding.

Dear All,

I have heard a lot about of HSLA(High Strength Low Alloy) and it
confusing me a lot.

Can anyone give a proper defenition for HSLA steel ?

What are all the common grades in API,ASME,ASTM,AISI comes under HSLA
steel category ?

HSLA-65 and API X65 are same material?

What are all the precautions we have to follow during HSLA welding ?

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