Re: [MW:6141] HSLA 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 ? -- To post to this group, send email to materials-welding@googlegroups.com To unsubscribe from this group, send email to materials-welding-unsubscribe@googlegroups.com For more options, visit this group's bolg at http://materials-welding.blogspot.com/ The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents. -- To post to this group, send email to materials-welding@googlegroups.com To unsubscribe from this group, send email to materials-welding-unsubscribe@googlegroups.com For more options, visit this group's bolg at http://materials-welding.blogspot.com/ The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents.

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The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents.