Recent content by CdotS

What is galling? It is just cold welding when metal comes in contact with another virgin metal. It is worse when you have similar metals. The mutual solid solubility determines the extent of galling - the higher the solubility limit the higher the tendency for cold welding. Stainless steel has...

Contact Dr George Vandervoort at Buehler for help: George F. Vander Voort Director, Research & Technology Buehler Ltd 41 Waukegan Road Lake Bluff, IL 60044 USA Phone: 1-847-295-4590 Email: George.VanderVoort@BUEHLER.COM

Hi desertfox Failure mode: Unfortunately, the fracture surface was subsequently abrased by soil and therefore of no use. It was smooth and flat - failed possibly by a brittle fracture mode. Strength: The hardness of the bolt (40 HRc) corresponds to an ultimate tensile strength (UTS) value of...

Just to conclude this post: The bolt was a 0.30 carbon steel with an average hardness of around 40HRc. It was possibly heat treated. The hardness readings show higher than expected for a Grade 3 bolt. I do not know why a Grade 3 bolt was made from a 0.3 C steel and heat treated when the spec...

How do you achieve a hardness of 60-64 HRc in 5115 steel with 0.15 carbon? Is it carburized?

Friction coefficient (FC) can vary as a function of applied load, speed and the environment. I have measured FC for aluminium against steel and also against itself. For Al-steel couple, FC varied from 0.4 to 0.6 whereas Al-Al 0.4 to 0.8, depending on the operating conditions. The static FC may...

If you are working in the oil and gas industry (upstream/downstream), NACE has several books including MR0175 (check the number). It has an equivalent ISO standards book for materials selection also.

I am a bit surprised at the direction this post has taken. I had only the head portion of a broken bolt and wanted to know what type of bolt that was. I figured out from the standards that was a Grade 3 bolt (thanks to those who helped me). SnTman, What kind of info do you want me to get from...

It is a plow bolt. It has a small square section under the head. The part has a square hole with a countersink. when I post hardness readings, I will include another photo for you. Please bear with the delay.

Mizzoueng, believe me, it is a bolt with top view taken just to show the markings. Do not let your imganination run too far.

It could be SAE Grade 3 and I will report here once the chemistry and hardness are done. Not enough material for tensile testing.

Thank you all for your immediate response.

Yes, I have tried the uspto site but this bolt marking is not listed. I will wait for awhile before paying for the second reference.

I have received a couple of bolts with a rather unique markings for failure analysis. It has two lines on its head. There is no such markings in the standards. I attach a photo of one of the bolts. If you know any info on this bolt, please let me know. Thanks.

Vukk, please provide of actual CVN values as IRStuff says. Also, some info on the process history such as heat treatment temperature and time and microstructure would be helpful. Generally, tempered martensite has higher toughness than as rolled pearlitic/ferrite. MikeMet, what is your hardness...