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  1. katrinali

    Is 316SS commercial requirement require UT test ?

    wegm (Industrial) Thanks a lot !!! this is really helpful : D Problem solved ~~ Cheers Kat
  2. katrinali

    Is 316SS commercial requirement require UT test ?

    Hi Guys, Not sure if 316ss commercail requirement ask for the UT test ( mostly? ) .. i thought the answer is no, but would like to confirm Thanks ahead Kat
  3. katrinali

    4130 hardness --will test direction make a big difference?

    Hi metengr tHANK YOU~! I think we will do the " swich and test again", since it is hard to tell now .both lab test are qualified... The portable test is our first quick reaction, i know usually it was not that accurate... Thanks, k
  4. katrinali

    4130 hardness --will test direction make a big difference?

    Hi, EdStainless Thanks for the reply, Here is the tricky part, customer have specs..and for 75/80k material , specs already give a range...which allow you go to the minimum.. Thanks. k
  5. katrinali

    4130 hardness --will test direction make a big difference?

    Hi redpicker, Thanks for the reply,the bar is larger than 10 ''round bar, Q&T, 80K, sample cut from the middle of the bar ( avoided the end of bar) test was done on the cut surface and longitudinal surface both, all milled properly . The thing is 10% make a big difference ....
  6. katrinali

    4130 hardness --will test direction make a big difference?

    Hi Cory pad, Thanks for the reply, i do understand the surface should be harder around the edge of the bar, but the problem is ... Both test location is around the edge of the bar diameter. few test was done on cutting surface<--which is away from the core and close to the surface. few test...
  7. katrinali

    4130 hardness --will test direction make a big difference?

    Hi metengr, Do you think we can rely on the test result, if the machine has the calibration done regularly? Actually we did another test which is just for reference, portable hardness test. which also shows a lower result, aroun 185-190. surface has been slight removed to obtain a smooth...
  8. katrinali

    4130 hardness --will test direction make a big difference?

    Hi metengr, Thanks for the information. The 3rd party hardness test was done as per ASTM A370 and E10, and test equiment is Adelaid CR-300 KN , with a serial number.. surface was milled. Test method is 3000 kg brinell test . ATM universal tester and birnell adapter with 10mm diameter tungsten...
  9. katrinali

    4130 hardness --will test direction make a big difference?

    Hi Guys, I came a cross an issue with hardness value on the 4130( 75/80K) bars: we did some lab hardness test(from 3rd party, quite qualified) on 20mm thick slice,( milled surface) the test location is on the cut surface it self, 2 test around the edge, 2 test around mid radius , and 2 test...
  10. katrinali

    Cold Temperature Metal Properties

    Hi NDA277- I am very interested in this question, hope someone might know ,, Just by guessing, according to me, should be back to normal since at such temperature -300F, no microstructure change will happen, so the properties should be the same... however, in normal sense if you freeze an...
  11. katrinali

    Where is the specification for 4140 L80--&gt;NACE HARDNESS 18-22HRC

    Corypad--Thanks for the information , so the 18 HRC suppose to be customer requirement i guess.. metengr- i think the min is 16 HRC since the ASTM A193 require 200 BHN minimum... Thanks for your comment :) Q
  12. katrinali

    Where is the specification for 4140 L80--&gt;NACE HARDNESS 18-22HRC

    Hi CoryPAD, Thanks for the reply, I do found the 22 HRC, but do you know where it was mentioned for 18 HRC ? i only found the 200HBW requirement in ASTM A193 ... Thanks Q
  13. katrinali

    Where is the specification for 4140 L80--&gt;NACE HARDNESS 18-22HRC

    Hi guys, I am new to this industry and i found many threads saying NACE hardness require 18-22 HRC range, but i went through it didnt find the min HRC mentioned anywhere, could anyone please help me out where is the min 18 HRC hardness in NACE ? thanks a lot. Regards Q

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