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is normalized the same as fine grain

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is normalized the same as fine grain

  1. is normalized the same as fine grain Fine Grain Practice - Metal and Metallurgy engineering ...

    Oct 06, 2005 · Fine Grain Practice. No. Normalizing is a heat treatment process and does not equate with fine grain practice. Fine grain practice begins with deliberate alloy additions during steel making. 4). No. Please note, if you intend to use these plates in a pressure vessel, you need to go back to the original code of construction (ASME or other)...

    Answer to Question 1). If the carbon steel plates are supplied under an ASTM/ASME specification, refer to ASTM/ASME A-20/SA-20, which is a Specification for General Requirements for Steel Plates for Pressure Vessels. Under Metallurgical Structure in Specification ASME SA-20; 8.2 Fine Austenitic Grain Size; If Al is used to provide for grain refinement, no further testing is required PROVIDED the product heat analysis contains at least 0.020% total Al or 0.015% acid soluble aluminum. If Al was not used for grain refinement, the steel shall have a carburized grain size of 5 or higher (finer) as determined by the McQuain-Ehn test in accordance with Methods ASTM E112 Plate IV. One test per heat. Answer to 2). It depends on the type of carbon steel plate. If carbon steel plates are supplied as fine grained with aluminum as the grain refiner, you will not develop coarse grains. Aluminum used for grain refinement forms oxides and nitrides that inhibit grain growth during processing.
    One thing to keep in mind is the difference between austenitic or prior austenite grain size and ferritic grain size.
    So if the coupon is carburized as specified in SA 20, under micro examination what grain do we observe. Is it Austenitic impression or is it ferritic grain?
    It is the prior austenitic grain size that you will be evaluating.
    bimoorthy, In answering your question No. 2, ferrite grain coarsening will occur with subsequent annealing or heating slightly below the upper critical temperature. One would have to hold at temperature for a long, long time to coarsen the grain to that af a "Coarse Grain Structure" though. I have typically seen only a coarsening of about one size during annealing. While greater coarsening was seen when fine grain melting was done through additions of niobium or vanadium, coarsening was also observed in steels that were fine grain melted with aluminum.
    Stanweld mentions an interesting point. The data that I have from "Physical Metallurgy Handbook" by Sinha shows a step change in grain coarsening at a minimum temperature of 1925 deg F for carbon steel treated with aluminum. This is well above normal process temperatures. Keep in mind that carbon steels using aluminum for fine grain practice have been reported to show an increase in susceptibility to graphitization upon long term exposure to elevated temperature service.
    Thanks a lot for the inputs. Now from the point of view of acceptance or rejection of the material 1) The material ordered is SA 516 Gr 60. Thickness 50mm (Normalized). Certificate shows Normalised but does not indicate any thing about melting practice and grain size. 2) Is it mandatory for the certificate to show that the material has under gone fine grain practice melting or should it show the grain size. Does it not automatically implied that the material has under gone fine grain practice melting process by the virtue of the material being SA 516? 3) Follow up question, Let us say the melting practice is not known, by normalizing does it automatically imply that the material is fine grain now. 4) Does the ferritic grain (Simply seeing under microscope with out carburizing) any indicator of the required Austenitic fine grain. That is if the plate is normalized and then i evaluate the grain size (With out carburizing, when we see Ferritic grain), does it meet the intent of the requirement of fine grain practice of the code. After all we are interested in the properties of the material which we are using and not about the Austenitic history?
    Your first statement is key regarding acceptance or rejection. Please note SA-516 states and I quote; "The steel shall be killed and shall conform to the fine grain practice of SA-20" If you are questioning the source of the steel plates this is a different matter, and concerns traceability and nonconformance. If you had ordered the plates direct then they should have been ordered with a Material Test Report in accordance with requirement 3) in SA-516 and the requirements in SA-20 on the original PO. I suspect what you have is a certificate of conformance??? If you have this, you should be able to go back and obtain a Material Test Report from the mill, this will answer your questions.
    Follow-up to answers for Question 3 and 4; 3). No. Normalizing is a heat treatment process and does not equate with fine grain practice. Fine grain practice begins with deliberate alloy additions during steel making. 4). No. Please note, if you intend to use these plates in a pressure vessel, you need to go back to the original code of construction (ASME or other) to re-certify the plates. See ASME B&PV Code, Section VIII, Div 1, Part UG.
    SA-106-B NormalizedJan 14, 2008
    DEFINITION OF FINE GRAIN PRACTICEApr 01, 2003
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  2. is normalized the same as fine grain normalizing/fully killed fine grain practice

    The phrase "fully killed fine grain practice" doesn't mean that the material has been normalized. Now, standard SA 516 requires that the steel be normalized for thicknesses above 1.1/2 inches, but for some reason the customer has included on the Purchase Order that the 1/2 inches plate he's buying be normalized, and he's paying for that.

  3. is normalized the same as fine grain Normalization/Grain Size Control Experiment (or why you ...

    Normalization/Grain Size Control Experiment (or why you should normalize) Share. Share with: ... and not have the edge holding ability of its fine grained counter part. ... Grain structure is similar in adjacent same-colored areas):

  4. is normalized the same as fine grain CR4 - Thread: Carbon Steel Grain Size

    Jun 14, 2010 · Fine-grained steels have higher notch toughness than course-grained steels. The transition temperature is lowered as the grain size decreases. The fine-grained condition is usually due to a deoxidation practice that uses silicon, aluminium, or vanadium.

  5. is normalized the same as fine grain normalized fine grain steel - natural-elements-online.com

    Weldable normalized fine grained pressure vessel steels can be provided by BEBON,BEBON is a professional supplier and manufacturer of Weldable normalized fine grained pressure vessel steels,please contact us for this.[PDF]

  6. is normalized the same as fine grain Fine-grain structural steels, normalized rolled ǀ ...

    Fine-grain structural steels, normalized rolled Usage The series of normalized rolled fine-grain structural steels is characterized by a minimum yield strength of 275 - 355 MPa, by good weldability and high resistance to brittle fracture.

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    is normalized the same as fine grain The Importance of Normalizing - Heat Treat Doctor.com

    By contrast, after furnace cooling in an annealing process, the hardness of the thin and thicker sections are about the same. Low-carbon steels typically do not require normalizing. If these steels are normalized, however, no harmful effects result.

  8. is normalized the same as fine grain Fine-grain structural steels,Fine-grain structural steels ...

    Fine-grain structural steels steel plate. These fine-grain structural steel grades are characterised by a minimum yield strength of 275 - 460 MPa, by good weldability and high resistance to brittle cracking. Fine-grain structural steels are used above all for manufacturing vessels for pressurised gas (LPG, butane and propane tanks), pressure vessels,...

  9. is normalized the same as fine grain What is fine salt? | Yahoo Answers

    Feb 27, 2008 · Answers. fine salt is like, basically table salt but the particles are a tiny bit smaller. actually table salt would probably work fine too. they mean, jsut dont use like those big chunks of salt you find on pretzels XD.

  10. is normalized the same as fine grain Normalizing Process for Steels | ispatguru.com

    Comparison with annealing. The tensile strength and the yield point of the normalized steels are higher than the annealed steels except in the case of low carbon steels. As in the case of annealing, normalizing also results into the formation of ferrite, cementite and lamellar pearlite. But in normalizing, since the cooling rates are higher,...

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