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bsae 4340 heat tbreatment

  1. Showing results for sae 4340 heat treatment.
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  2. bsae 4340 heat tbreatment AISI/SAE 4340 Alloy Steel- 4340 Steel Properties | All ...

    AISI/SAE 4340 Alloy Steel, 4340, is a nickel-chromium-molybdenum alloy steel known for its toughness and its ability to attain high strengths in the heat-treated condition. Commercial and military aircraft, automotive systems, forged hydraulic and other machine tool applications, forged steel crankshafts.

  3. bsae 4340 heat tbreatment 4340 Heat Treating - Material engineering other topics ...

    Mar 04, 2008 · I am heat treating 4340 attemting to achieve the following results (similar to ASTM A540-B23): Tensile 145,000 psi Yield 130,000 psi Elongation in 2 of 12% Redu 4340 Heat Treating - Material engineering other topics - Eng-Tips

    This is mostly just a swag, however what is the section size? Doesnt prior austenite grain size have an inverse effect on charpy impact strength? My thought is that your austenization time is too long and it could be reduced to prevent excessive grain growth. Nick I love materials science!
    Quote: Doesnt prior austenite grain size have an inverse effect on charpy impact strength? My thought is that your austenization time is too long and it could be reduced to prevent excessive grain growth. Yes and Yes. The austenitization time for this material is occurs much more rapidly than you think. If the section size is 1" or greater, I would soak for 1 hour, and check austenitizing temperature every 15 minutes. Once the component has reached the minimum temperature, remove it from the furnace and into the quench tank.
    Currently, I am working with 3 different section diameters, 6.5", 8", and 11.5". However, my latest results were from heat treating the tensile and charpy samples only. Would that explain the low charpy? The long austenitize would cause grain size growth due to the small sample size.
    Yes, fine grain size results in improved notch toughness properties. I checked with my ASM Handbook on line and for 4340 alloy steel to austenitize; maintain heat at the austenitizing temperature (1475-1550 deg F) for 15 minutes for every inch of material thickness. Is the net section thickness less than the diameter, if so, this is thickness you need to govern the time for austenitizing (also you should use TC's versus the above to minimize your time at austenitizing temperature). Quench to below 150 deg F.
    You should be cutting samples from the bar stock at mid-radius after heat treatment is completed in order to make your Charpy impact specimens, not loading pre-made Charpy blanks alongside the bar stock inside the heat treat furnace. As Nick and Metengr both pointed out, austenitizing such a small sample for the length of time that you stipulated will produce excessive grain growth, which will adversely affect the Charpy impact toughness. If you choose to heat treat a standard Charpy impact specimen in a controlled atmosphere furnace instead of sectioning it from the heat treated bar stock, then the soak time at the austenitizing temperature for this specimen should not exceed 30 minutes. Cutting a sample from the bar stock after heat treatment is completed is not an easy thing to do, but it is the best way to ascertain what your impact toughness values really are. I would also measure the grain size in your current Charpy samples and then compare that with the grain size you obtain from a samples that are sectioned from the heat treated bars at mid-radius. You will very likely see a significant difference in grain size between these two sets of samples. What is the soak time that you are currently using for each of the bar diameters you listed in your reply? Maui
    We used a soak time of 3.5 hours for everything that we did. We are just getting into optimizing material properties as opposed to hardening material just to get a surface hardness. We are going to run some experiments based upon the information provided specifying 15 minutes per inch of material thickness.
    As metengr noted, the austenitizing temperature should be in the range of 1475-1550 F. 3.5 hours at 1575 F will most certainly result in a large austenitic grain size and therefore poor fracture toughness (charpy test). Use the lowest austenitizing temperature for maximizing toughness.
    You might preheat at 1200 F and soak to reduce the high temperature soak time.A soak at 1200 F won't have any effect on grain size.
    I am a commercial heat-treater. depending on the mill and the quality of the heat of steel will depend on your results. Assuming you are just doing this for testing purposes cut the test pieces to 4"x4"x6" run all together in an open furnace if you can, if not run in atmosphere furnace. if you run in an atmosphere furnace i would temper at 1025 instead of 1000. Process as follows 1. Normalize 1650 [email protected] A/C 2. Harden 1550 [email protected] oil quench 14-17 minutes in agitated oil 3. Temper 1000 [email protected] A/C 4. check hardness should be appx. 341 HBW/36 RC charpies shouldn't be a problem if it is a good heat of steel. also try to start your quench when the oil is at appx. 125-135 degrees. you will get much better properties. snap tempering does nothing in my experience. your hold times are no where near long enough for the cross section's you are working with.. a good rule of thumb is 1/2 hr/inch + 1 for normalize and hardening cycles and 1 hour/inch for tempering.
    If hardenability is not your major concern, but it does appear so as you mentioned your real size is 6.5'' ~ 11.5'', I suggest you try 4330. You can very easily achieve the toughness, of course you have to tune the heat treatment.
    HEAT TREATMENT OF 4340Nov 08, 2006
    Heat Treat 4340 - Metal and Metallurgy engineeringNov 07, 2003
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  4. [PDF]

    bsae 4340 heat tbreatment Through-Hardening Low Alloy Steel Bar 4340

    Through-Hardening Low Alloy Steel Bar 4340 Colour code: Jade (Band) - Marigold Introduction Atlas 4340 is a nominally 1.8 percent Nickel Chromium Molybdenum low alloy steel of high hardenability, with high strength and toughness in relatively large sections achieved with a "quench-and-temper" heat treatment.

  5. [PDF]

    bsae 4340 heat tbreatment 4340 High tensile steel -

    4340 High tensile steel Typical Analysis C Si Mn Ni Cr Mo S P (Ave. values %) 0.40 0.25 0.70 1.80 0.80 0.25 0.025 0.025 ... HEAT TREATMENT Nitride Suitable for both liquid and gas nitriding. ... of the joint will not be the same as the base metal. Preheat 300-400oC. Temper after welding to about 35-50oc below the recommended tempering temperature.

  6. bsae 4340 heat tbreatment AISI/SAE 4340 datasheet,AISI/SAE 4340 chemical,AISI/SAE ...

    Technical specification of SAE/AISI/UNS system standard alloy structural steel AISI 4340 data sheet, SAE 4340 Chemical compositions, AISI 4340 Mechanical properties from Steelmaking, ESR melted, Blooming, Hot forging,Hot rolling,Heat treatment, Straightening, 100% Ultrasonic test, Cold working, Peeled or rough turned machining.

  7. bsae 4340 heat tbreatment 4340 High Tensile Steel | Interlloy | Engineering Steels ...

    4340 High Tensile Steel. 4340 is a 1.8% nickel - chromium - molybdenum high hardenability high tensile steel - generally supplied hardened and tempered in the tensile range of 930 - 1080 Mpa (condition U) - (Rc 28 - 36).. Characterised by high strength and toughness in relatively large sections.

  8. bsae 4340 heat tbreatment SAE 4340 -

    Haihong International Trade (HK) CO., Limited. Stainless Steel, Special Steel, Compressor Blading, Turbine Blading, Superalloy Supplier. SAE 4340 can be supplied as steel plate/ sheet, round steel bar, steel tube/pipe, steel stripe, steel billet, steel ingot, steel wire rods. electroslag, forged ring/ block,etc. TEL:+86-816-3646575 FAX: +86-816-3639422

  9. [PDF]

    bsae 4340 heat tbreatment Heat Treating Data Book - SECO/WARWICK

    The SECO/WARWICK Heat Treating Data Book contains information about heat treating metals. This book is not intended as a text, but rather as a collection of frequently used reference data to serve persons interested in heat treating technology. If it saves …

  10. bsae 4340 heat tbreatment 4340 Steel | 36CrNiMo4 | 1.6511 | EN24 | SNCM439 - Otai ...

    AISI 4340 Steel Grade Heat Treatment. For pre-hardened steel stress relieving is achieved by heating steel 4340 to between 500 to 550°C. Heat to 600 °C – 650 °C, hold until temperature is uniform throughout the section, soak for 1 hour per 25 mm section, and cool in still air.

  11. [PDF]

    bsae 4340 heat tbreatment Evaluation of toughness in AISI 4340 alloy steel ...

    Based on these and other observations, it is considered that the use of high temperature austenitizing be questioned as a practi- cal heat-treatment procedure for ultrahigh strength, low alloy steels. Finally, it is sug- gested that evaluation of material toughness should not be based solely on Kic or Charpy

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