Couple of years ago, we had a project to investigate a weld repair of a carbon alloy steel for high temperature service which goes under a sub-zero freezing at temperatures from, -100F to -300F and held at that temperature for extended periods from 24 hrs. to 2 weeks. and then allowed to warm...
If I understand your question correctly,
The acceptable % range is provided in a material's chemical specification to provide the limits for which the intended chemical analysis will met the reguired mechanical properties and acts as a acceptance or in spec./ out of spec determination of the...
Good Morning fellow Engineers
I am looking for someone who has some experience with Ultrasonic Impact treatment for increase fatigue resistance in welds. I would like to hear this person’s opinion on the treatment particularly with carbon and low alloy steels.
Thanks
Recently we have had problems with quench cracking of cold finish 4140 bar. The heat treater claims there are tiny surface fold conditions present from the cold finish process that cause the quench crack. Metallographic examination so no surface conditions associated with the crack initiation...
Does anyone have any experience with heat treating Aluminum Bronze C95400? Heat treatable grades of Aluminium Bronze contain 9.5 to 11.5 % Al, with iron , small amounts of nickel and manganese. The reason for heat treating is increasing tensile strength and hardness with improved impact...
Back sometime in early 2007, I read a thread which discussed digital camera attachments and software for metallurgical metallographic uses. As I remember this equipment was considered to be the best. I just cannot remember the products name. Recently I purchased a used Nikon Epiphot which I...
What is the lowest expected temperature?
Is the A53 pipe welded or seamless? Chemically A53 is only a carbon steel with 0.25-0.3 C, with manganese- 0.95-1.20
A53 wouldn’t be similar to AISI 1018? Would it? AISI 1018 has 0.15-0.20 carbon and 0.60/0.90 Mn.
I would be concerned about...
Hello WWong7:
I have a few comments regarding Aluminum Bronzes vs. Manganese Bronzes based on a recent study here at our laboratory:
1 As- cast and annealed Aluminum Bronze’s have tensile properties (yield and UTS) and hardness less than manganese bronzes.
2 In service, manganese bronzes have...
Sarataylor6:
Sorry this maybe a little late. As a member of ASTM E 21, we participated in a round robin test program on elevated tensile testing a few years back. Check with ASTM headquarters request RR-E28-1015. I still have a few specimens left, standard high temp. Specimen, shoulders and...
I agree with mentengr, using a temperbead welding technique might eliminate the need for PWHT. Unclesyd, my thought was lowering the PWHT temperature might help by not affecting the A572 hardness and toughness, hopefully still providing enough stress relief of the weldment. All of these ideas...
Castle74, I certainly think normalizing is worth the try. Seems to me your options are (1) welding procedure with carefully controlled interpass temperatures to avoid high hardness in the 8630 HAZ, (2) a lower stress-relief temperature to obtain the desired stress relief of the weldment but not...
I am wondering about the use of term "normalizing". I am aware that the terms normalizing and stress relieving do not always describe fully the process. 1125F is not above the A3 temperature for A572 therefore it is not normalizing at all, and is more indicative of stress-relieving or sub...
true, however, not all producing mills, follow the same rolling and finishing temperatures, which effects for one the plates microstructure, example: banded structure.I agree with your comment about micro-alloy additions intent. My comment was directed to castle74 question if anyone had dealt...
True, A572 gr 70 has no reguirement for normalization.This material is used extensively for "fracture critial applications" in the AASHTO specs.On occasion we have had clients that had requirements for toughness (CVN)at temperatures which is questionable for this grade (-50F and below).So...
