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Recent content by smslab

  1. smslab

    H13 equalized too long

    They've done hardness and not suprisingly it was fine. I have advised them to check grain size.
  2. smslab

    H13 equalized too long

    Thanks for the replies. I'm not at liberty to name the application, but it involves thermal cycling and limited impact loading. The inhouse spec is vague - it calls out a hardness but does not for example disallow any of the microstructures that NADCA 207 disallows. What do you think of this...
  3. smslab

    H13 equalized too long

    What are the consequences of equalizing H13 too long when ramping up to the austenitizing temperature? Standard procedure is to heat to 700 C, equalize for 15 min, then up to 850 C, equalize for 15 min, and then ramp up to the austenitizing temperature of 1030 C. Thanks to some problems with the...
  4. smslab

    Carbon and hardness in 400 series stainless

    arunmao I hear ya. I've seen issues with suface polishing in 316 (ok CF-8M) from a Chinese source where the issue was a cooling rate. They'd rather fix it by using an anneal than monitor their cooling rate. But anyway...these castings are made in the US - the raw material is the same for parts...
  5. smslab

    Carbon and hardness in 400 series stainless

    Quicker than expected I got answers: These are investment castings with no hot shake out, they cool in the mold. They are not machined prior to heat treat. Aside from a long-term fix I am wondering if the current batch can be saved or if they are a lost cause. Thanks in advance for words of...
  6. smslab

    Carbon and hardness in 400 series stainless

    ASM Handbook Vol 4 does not have it. So far I've found something that references the Welding Handbook Part 4 1972 that shows a Brinell hardness vs C (goes from 0.07 to 0.15 %) and Cr (goes from 12-13%) but only for oil quench from 980 C. I do not have detail on the casting process but...
  7. smslab

    Carbon and hardness in 400 series stainless

    Does anyone know of a diagram showing the effect of carbon content in martensitic stainless steels with approx 12 % Cr? Ideally I'd like to find diagrams for a series of tempering temperatures but at this point I'd be delighted to find anything. In case anyone is interested, the background...
  8. smslab

    Properties for CS Plate - AS1548-1-430

    Could the standards listed on this page be helpful? http://www.bluescopesteel.com.au/go/product/sa/as-1548-7-460t-xlerplate
  9. smslab

    Specifying properties of 4140 castings?

    arunmrao I am not going to disagree with you but this is not my call to make. At this point I am doing what I can to dig up info - I am a heat it and beat it / mechanical tester myself so this is not an area I feel comfortable giving advice. I'll pass everything on so pleas ekeep it coming...
  10. smslab

    Specifying properties of 4140 castings?

    Thanks for the info so far. I forgot to mention that this is a shaft with a spline that needs to be hardened. The logical choice would have been 8620 with a carburization but for reasons which I do not completely understand (this is on behalf of a friend) the foundry is unwilling or unable to...
  11. smslab

    Specifying properties of 4140 castings?

    I'm looking for advice from someone who has experience with 4140 castings or similar. The intent is to produce a cylindrical part whose largest diameter is 3.5 " Service temperatures are anticipated to range from -30 F to 100 F. Desired yield strength is 60-70 ksi, desired impact energy is 65...
  12. smslab

    Wear and Stainless Steel

    I'm back with my wear problem, older and wiser. We decided to do some lab tests to see if we could find any differences in abrasive wear resistance between 301 1/4 hard (candidate material), 304 (current material) and 17-4 PH H900 (candidate material) with and without weldments. The 301 1/4 hard...
  13. smslab

    Strain Rate Sensitivity....

    What is it you are worrying about? For whatever it is worth, I did a lot of tensile tests years ago at various strain rates. The reason is that we were having trouble comparing tensile data (done at a low strain rate) with fatigue data (at 100 Hz the strain rate was several orders of magnitude...
  14. smslab

    Zinc in Brass / Bronze

    Ummmmm, thanks for the reply, but I had already seen the web page (and am familiar with various equivalents used in C-steels, Ti-alloys, cast irons, etc). I need more information than is readily available on the internet. Who was Guillet and why did he/she develop that formula? Is it for...
  15. smslab

    Zinc in Brass / Bronze

    Ummmmm, thanks for the reply, but I had already seen the web page (and am familiar with various equivalents used in C-steels, Ti-alloys, cast irons, etc). I need more information than is readily available on the internet. Who was Guillet and why did he/she develop that formula? Is it for...
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