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Folks, Do you have any problems (cracking issues) with A203 aluminum alloy after heat treatment? I try different cooling cycles but either is cracking (hot water), or does not meet the mech. properties (air). Also I have recommendation to use Helium or Argon (too expensive, but it works). Any...

RC, Thank you for your fast response. You are right; those are not "really" boilers, there are water heaters, using natural gas. I do not know what pressure could build into them. I'll try to contact the customer to give me more info. Regards, CC

Folks, I have a question from one of my customers. They are building commercial/residential boilers and are interested if it is any possibility of reaction between brass and aluminum alloys or stainless steel, brass and aluminum alloys. The boiler body is made of aluminum and he wants to use...

If you need some help on alloy selection, I recommend "ASM - Metals Reference Book". What do you need to know about superalloys?

I recommend heat treatment after welding: Normalize and Temper (see ASTM A487 - 9. Repaire by welding, para 9.3). It works more like a stress releve. (You may have cracking problems if you do not do it.)I am doing as a general rule: Normalize: 1600°F ± 25°F, one hour per inch of maximum section...

I am using an INNOV-X (see innov-xsystem.com, president Don Sackett; ph: 781-938-5005), which is a portable XRF, with the size of the cordless drill gun. It is good for carbon steel, SS, Ni-base, Co-base, not for Al. The other company is NITON, which has 2 models: XRF and izotope. (niton.com...

Is AWS D17.1 -2001 replacing AMS - STD - 1595 (MIL - STD 1595) or is just an addition/duplication of requirements for the aerospace part manufacturers? I haven't seen anywhere any notes ( in the body of the spec) where this spec supersedes any other specs; (speaking with different welding...

I am trying to find a correlation between the % of austenite in 17-4 ph to mechanical properties (research). I have seen lots of articles that is better to have such and such, but no data. Theoretically, I know that, but is it anywhere, or anybody has any info about this correlation? One of my...

Thank you for your fast response. I would like to find study/data regarding the direct correlation between the %austenite and mechanical properties. I know the chemical composition control is an important factor in the ferrite-austenite-martensite %, but based on this I can correlate with the...

I need a little help to find data regarding the % austenite in 17-4PH and mechanical properties. Any recommendations are appreciated.(books, articles, etc.)

Question: Can I qualify a welder for casting weld repair from Carbon and Alloy steel, in accordance with AWS D17.1:2001 (or former AMS/MIL-STD1595) using 8620 Heat Treatable Alloy Steel instead of any steels from group IB table 4.2 (or in AMS 1595 para 10.2 in the Appendix, page 61 Base metal...

BS 3146 Part 1 CLA 11 covers castings with 3% Cr-Mo nitriding steel (alloy similar BS 970 - 722M24.) Analysis C 0.20/0.30 Si 0.3/0.8 Mn 0.3/0.6 S & P 0.035 max Cr 2.9/3.5 Mo 0.4/0.7 Ni 0.4 max Cu .3 max V .02 max Sn .03 max Mech prop (min) TEN. STRENGTH 924 N/MM2 YIELD STRESS 780 N/MM2 ELONG...

Any recommended cast materials (Ni or Co base) to use for the oilfield drilling (turbodrilling motors) with similar properties to BS3146 Part 1 CLA 11 (nitriding steel)?

Any recommended cast materials (Ni or Co base) to use for the oilfield drilling (turbodrilling motors) with similar properties to BS3146 Part 1 CLA 11 (nitriding steel)?

Thank you. Any hints about castability (investment), heat treatment? Any cross-reference with ASTM/AMS/AISI steels? I appreciate the help. CC

Could anybody give me a reference about BS 3146 and equivalences? I am interested specific for the BS 3146 Part 1 Cla 11. What steel will be equivalent (AISI, ASTM, AMS, etc.). Also, I have a reference for "15 ND8" treated material. Thank you CC

A few months ago I talk to a gentleman about this subject. The name of the company is Technomics L.L.C. and the contact was Chuck Bergman. PH:763-383-4720 ext 11, email:cbergman@rapidheattreat.com

Thank you very much for your support. Based on you experience, do I need to pre-heat the parts before welding (and what it is the recommended temp) and how about cooling after welding (slow cool I assume, but how slow?)

THX for the fast response. The chems is close with ASTM A356 grade 9 C=0.2% max, Mn=0.5-0.9%, Si=0.2-0.6%, Mo=0.9-1.2%, Cr=1.0-1.5%, V=0.2-0.35%, Fe=bal.

Hi Folks, I need a little help/recommandation for welding Cr-Mo-V low alloy steel investment casting. Is anybody having some information to share about: what welding rod better to use, pre-heat temps and after weld cooling speeds, post-weld ht, etc. Thank you CC