Metallurgy, what causes this?

[Member 34319]

My grill is old, beat up and at least 10 years old. The stainless grill bars are starting to split? What would cause this?

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[Provincial]

Intergranular corrosion.

" Cr-Mn and Cr-Mn-Ni steels are also susceptible to intergranular corrosion following sensitization in the temperature range of 420 °C–850 °C. In the case of the austenitic stainless steels, when these steels are sensitized by being heated in the temperature range of about 520 °C to 800 °C, depletion of chromium in the grain boundary region occurs, resulting in susceptibility to intergranular corrosion. Such sensitization of austenitic stainless steels can readily occur because of temperature service requirements, as in steam generators, or as a result of subsequent welding of the formed structure."

Intergranular corrosion - Wikipedia

en.wikipedia.org

 

[Member 34319]

Thanks! Crazy looking to be honest, I've never seen such a thing before. My grill has been a good tool over the years, it is in drastic need of new components!

 

[Hop Sing]

Yeah, heat cycling takes a toll even on non-moving parts.

 

[BBQ Guy]

Intergranular corrosion.

" Cr-Mn and Cr-Mn-Ni steels are also susceptible to intergranular corrosion following sensitization in the temperature range of 420 °C–850 °C. In the case of the austenitic stainless steels, when these steels are sensitized by being heated in the temperature range of about 520 °C to 800 °C, depletion of chromium in the grain boundary region occurs, resulting in susceptibility to intergranular corrosion. Such sensitization of austenitic stainless steels can readily occur because of temperature service requirements, as in steam generators, or as a result of subsequent welding of the formed structure."

Intergranular corrosion - Wikipedia

en.wikipedia.org

Thanks.
I learned something new today.

 

[Flopsweat]

Intergranular corrosion.

" Cr-Mn and Cr-Mn-Ni steels are also susceptible to intergranular corrosion following sensitization in the temperature range of 420 °C–850 °C. In the case of the austenitic stainless steels, when these steels are sensitized by being heated in the temperature range of about 520 °C to 800 °C, depletion of chromium in the grain boundary region occurs, resulting in susceptibility to intergranular corrosion. Such sensitization of austenitic stainless steels can readily occur because of temperature service requirements, as in steam generators, or as a result of subsequent welding of the formed structure."

Intergranular corrosion - Wikipedia

en.wikipedia.org

Thanks.
I learned something new today.

Doncha just love this place?

 

[BBQ Guy]

Doncha just love this place?

I do.
Since i pledged to stay from farcebook so much and removed it from my phone. I tend to hang out here a bit more than i used to.

 

[Member 34319]

To my surprise I found a complete rebuild kit for my exact model grill on the internet. Got all new stainless steel burners, heat dispersers, and cook grate.

 

[Member 5605]

To my surprise I found a complete rebuild kit for my exact model grill on the internet. Got all new stainless steel burners, heat dispersers, and cook grate.

View attachment 850408

Now that's amazing!!

 

[Member 34319]

Now that's amazing!!

No joke, it is an old, no longer exists company made by Lowe's back 10-12 years ago. The outside of its is all stainless and looks great considering its age. The bolts holding it together surprisingly still have good integrity for their age. I spray the non stainless parts with a rust fighting lubricant every year. I Try to keep the basin clean and scrape the carbon and gunk off 1-2 times a year. Always keep the grease trap clean as since moving to Oregon I've learned possums have a taste for the stuff. Only thing I need to try and find now is a new thermometer, the one on the lid is pretty much gone.

 

[Member 5605]

. Only thing I need to try and find now is a new thermometer, the one on the lid is pretty much gone.

lots of lid thermometers out there. I snagged an extra from a Coastal Farms for $20 not too long ago. By GMG so the thermo was the same siZe as the hole in the lid.

 

[Mikej]

No joke, it is an old, no longer exists company made by Lowe's back 10-12 years ago. The outside of its is all stainless and looks great considering its age. The bolts holding it together surprisingly still have good integrity for their age. I spray the non stainless parts with a rust fighting lubricant every year. I Try to keep the basin clean and scrape the carbon and gunk off 1-2 times a year. Always keep the grease trap clean as since moving to Oregon I've learned possums have a taste for the stuff. Only thing I need to try and find now is a new thermometer, the one on the lid is pretty much gone.

I'm running a China made Ducane for close to 20 years. All stainless. I replace the deflectors and burners every year, year and a half, depending on use. BBQparts.com is a place that carries a lot of parts. My pan underneath the burners rusted out long ago in places. I use the munged out deflectors, flattened with a hammer, to line the rusted out pan. Still going strong!

My grills are original still. I look at the grills out there these days and see total crap. One piece of advice for anyone buying a new grill, get one with stainless steel grills. NO cast iron! It will turn to rusty crap without constant maintenance. NO porcelain coated steel! Same as cast iron after that porcelain cracks and falls off. And it WILL crack and fall off!

 

[BBQ Guy]

I'm running a China made Ducane for close to 20 years. All stainless. I replace the deflectors and burners every year, year and a half, depending on use. BBQparts.com is a place that carries a lot of parts. My pan underneath the burners rusted out long ago in places. I use the munged out deflectors, flattened with a hammer, to line the rusted out pan. Still going strong!

My grills are original still. I look at the grills out there these days and see total crap. One piece of advice for anyone buying a new grill, get one with stainless steel grills. NO cast iron! It will turn to rusty crap without constant maintenance. NO porcelain coated steel! Same as cast iron after that porcelain cracks and falls off. And it WILL crack and fall off!

If ya'll stop cooking with the girl scout gas you dont need to fix or replace nearly as many parts.....

 

[Mikej]

If ya'll stop cooking with the girl scout gas you dont need to fix or replace nearly as many parts.....

I have a Weber kettle too. Burgers, teriyaki chicken thighs, grilled vegies, and some other quick cooking things, on the gas grill! the Weber is mostly when I've got stuff I want to smoke. Indirect heat with a drip pan in the middle. My preferred wood is apple.

 

[Boboclown]

I'm running a China made Ducane for close to 20 years. All stainless. I replace the deflectors and burners every year, year and a half, depending on use. BBQparts.com is a place that carries a lot of parts. My pan underneath the burners rusted out long ago in places. I use the munged out deflectors, flattened with a hammer, to line the rusted out pan. Still going strong!

My grills are original still. I look at the grills out there these days and see total crap. One piece of advice for anyone buying a new grill, get one with stainless steel grills. NO cast iron! It will turn to rusty crap without constant maintenance. NO porcelain coated steel! Same as cast iron after that porcelain cracks and falls off. And it WILL crack and fall off!

Who doesn't enjoy the taste of rust in their ribs though?

 

[Member 34319]

I had a Weber. It didn't last 3 years up here. Rusted out pretty quickly. I have considered one of the EGG type ceramic ones.