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Recent content by remetaper

  1. remetaper

    Weld NDT of tapered fitting

    Need to know :(1) geometry and dimension of pipe ( outside diameter and thickness) (2) steel grade of tube (3) autogenous welding or by filler?. All these info are indispensable in order to understand which kind of NDT methode could be applied.
  2. remetaper

    XRF analysis of 430F vs. 430FR

    Ed, I didn't refer to spectographic analysis apparatus such a - for instance- Thermofischer mod.4460 ( ex ARL) used for final heat analysis certified by steel maker where "precision and accurancy" is mandatory. I did talk about OES mobile and XRF mobile ( such as Specro )widely applied by most...
  3. remetaper

    XRF analysis of 430F vs. 430FR

    I think there no difficulties to separete 430 FR and 430 F by use MPI. Also the spark of MPI( Spectrum or ARL) is a little be different.In any case, the value of Mn is wrong. Normallly , value of is Mn < 0,5% in order to increase the resistance corrosion for free machining ferritic SS and...
  4. remetaper

    Effect of microstructure on induction hardening steel

    Maui, all my evaluations was done considering the available information. Therefore, darkness or not darkness of micro cannot be evaluated if the time or kind of etching are not available. In any case, the structure of sample A is coming from a fast cooling + tempering. In my previous mail,I...
  5. remetaper

    Effect of microstructure on induction hardening steel

    Maui, I was forgetting. In order to complete these evaluations, you should verify what both certificates of Supplier A and B declare about the hardeness and/or mechanical properties in delivered conditon , size and chemical composition as well. The hardeness you have found verifying steel A...
  6. remetaper

    Effect of microstructure on induction hardening steel

    Maui, most of induction heating applications, require a condition of hardening + tempering heat treatment of steel in order to obtain a tempered martensitic structure whose Hrc value ( or Rp 0.2 an Rm )will depend on final use. The reason why of this structural condition were explained in my...
  7. remetaper

    Effect of microstructure on induction hardening steel

    Micro A is in hardened + tempered condition and NOT in as rolled condition because this grade cooled after hot rolling shows a microstructure of perlite and ferrite. (unless a special cooling process had been applied) --- Micro B is in annealed condition or slow cooled after hot rolling. A...
  8. remetaper

    410 hardness as per NACE

    Chonghm, 410 has a tempered martensitic structure. F6NM shows a tempered martensitic structure with a certain amount of stable austenite depending on its chemical balance and tempering temperature. This kind of austenite is a good "airbag " in some aggressive and cryogenic environments...
  9. remetaper

    Forging of SS304L and grain boundary carbides

    Excluding a high level of segregations , it's very unusual that this grade with C% lower than 0,03% and N < 0,01% is affected by carbide precipitation with a rapid cooling rate from 1050-1150° C and with the right soaking. I am a little be perplexed about the declared Nitrogen content ( N=...
  10. remetaper

    effect of multiple weld repair at Stainless Steel 304L

    Ed Stainless:in welded (fused ) austenitic structures, delta ferrite doesn't transform in martensite after cold working. Only austenite could have this behaviour. Probably, you are reffering to transformation of delta ferrite into sigma phase.
  11. remetaper

    316/316L Dual cert

    I suggest to verify the certificate: what is Sulphur content ??? Indipendently if 316 L or 316, if S% is very low ( < 0,01), machinability will be poor. On the contrary, if S% = 0,02-0,03 , machinability will good. Moreover, as EdStainless said, if the structure were a little bit harder and...
  12. remetaper

    Seams in Steel Rebars

    Rebars have basically same kinds of seams of other hot rolled round bars. Depending on kind of seam ( as crack ,if you like ), it's more easy to detect by visual testing on large diameters than in small ones. Typical surface defects of carbon steel depending on poor surface quality of...
  13. remetaper

    Edge Check for high Ni grades

    Evaluations of Ed and suggestion of Metengr are right. But, do you think it wouild useful to know which kind of Ni-alloy ( or ASS ) are you reffering ? General speaking ,temperature of 2400 F for most kind of Ni-alloy is exagerated and close to melting (2550-2600 ). At first plastic...
  14. remetaper

    Br and Hc from 1 T or from Bs

    Thank you for your answer and I agree with your evaluation. I think a knowledge of Hc and magnetization curve would suffice because Brem depends on the magnetic circuit condition and could vary.
  15. remetaper

    Br and Hc from 1 T or from Bs

    Hello, there is a specific reason why for relay application of both ferritic SS or Si-Fe alloys, Br and Hc values are generally required misuring at the maximum flux density of 1 Tesla ( 10kG) instead of saturation flux density Bs ?
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