Tag: Steel

New TT-C-490 Revision F released for Chemical Conversion Coatings and Pretreatments for Metallic Substrates (Base for Organic Coatings)

TT-C-490 Revision F, “Chemical Conversion Coatings and Pretreatments for Metallic Substrates (Base for Organic Coatings),” has just been released and is available now from Document Center Inc. in either pdf or paper format.  This federal specification replaced MIL-C-490 and MIL-P-14504 and is one of the most commonly used plating specifications we sell.

TT-C-490F covers processes, pre-treatments, and pre-primer surface preparations of metallic substrates for coating applicators.  It covers metal surface preparation for delaying corrosion initiation and promoting primer adhesion. In addition, this specification covers the testing requirements for qualification of conversion coatings, the pre-treatments and pre-primer coatings.

The new 24-page revision has extensive changes from the now-obsolete 17-page TT-C-490E from 2002, so there are no lines in the margins showing you the updated material.   Changes appear to have been made throughout the document.

Document Center Inc. has been providing mil-specs and standards to industry for over 30 years, and since 1993 on our website, www.document-center.com. You can count on us to provide you with the latest information and updating services that are not available from many other sources.  Feel free to get in touch with us by phone (650-591-7600), fax (650-591-7617) or email (info@document-center.com).  We have the expertise to assist you with not only your standards purchases but other management services you need to keep your collection in good working order.

New ASTM E1444 2011 Edition on Standard Practice for Magnetic Particle Testing

ASTM E1444, “Standard Practice for Magnetic Particle Testing,” has been issued as a new 2011 Edition with a redesignation to ASTM E1444/E1444M-11.  This new document number shows that the document has been revamped to include both feet and inches and metric measurements.  It replaces MIL-STD-1949, as well as the previous ASTM E1444-05 Edition from 2005.

This practice establishes minimum requirements for magnetic particle testing used for the detection of surface or slightly subsurface discontinuities in ferromagnetic material. Guide ASTM E709 can be used in conjunction with this practice as a tutorial.

Magnetic particle testing consists of magnetizing the area to be examined, applying suitably prepared magnetic particles while the area is magnetized, and subsequently interpreting and evaluating any resulting particle accumulations. Maximum detectability occurs when the discontinuity is positioned on the surface and perpendicular to the magnetic flux.

The magnetic particle testing method is used to detect cracks, laps, seams, inclusions, and other discontinuities on or near the surface of ferromagnetic materials. Magnetic particle testing may be applied to raw material, billets, finished and semi-finished materials, welds, and in-service parts. Magnetic particle testing is not applicable to non-ferromagnetic metals and alloys such as austenitic stainless steels.

ASTM E1444/E1444M establishes the basic parameters for controlling the application of the magnetic particle testing method. This practice is written so that it can be specified on the engineering drawing, specification, or contract. It is not a detailed how-to procedure to be used by the examination personnel and, therefore, must be supplemented by a detailed written procedure that conforms to the requirements of this practice.

This ASTM Standard and all current (as well as many obsolete) Editions can be purchased from Document Center Inc. at our website, www.document-center.com.  Or contact us by phone (650-591-7600), fax (650-591-7617) or email (info@document-center.com).  We are able to answer many questions about standards and welcome your inquiries.

 

ASTM A370, Standard Test Methods and Definitions for Mechanical Testing of Steel Products – New 2011 Edition available

ASTM-A370 2011 Edition titled “Standard Test Methods and Definitions for Mechanical Testing of Steel Products” has just been released.  These test methods cover procedures and definitions for the mechanical testing of steels, stainless steels, and related alloys.  The new 2011 edition replaces the previous 2010 issue.

ASTM-A370 test methods center on Ductile vs. Brittle Behavior.  Body-centered-cubic or ferritic alloys exhibit a significant transition in behavior when impact tested over a range of temperatures. At temperatures above transition, impact specimens fracture by a ductile (usually microvoid coalescence) mechanism, absorbing relatively large amounts of energy. At lower temperatures, they fracture in a brittle (usually cleavage) manner absorbing appreciably less energy. Within the transition range, the fracture will generally be a mixture of areas of ductile fracture and brittle fracture.

The temperature range of the transition from one type of behavior to the other varies according to the material being tested. This transition behavior may be defined in various ways for specification purposes.

The specification may require a minimum test result for absorbed energy, fracture appearance, lateral expansion, or a combination thereof, at a specified test temperature.

The specification may require the determination of the transition temperature at which either the absorbed energy or fracture appearance attains a specified level when testing is performed over a range of temperatures. Alternatively the specification may require the determination of the fracture appearance transition temperature (FATTn) as the temperature at which the required minimum percentage of shear fracture (n) is obtained.

This ASTM Standard, and all ASTM documents, may be purchased from Document Center Inc. via our website, www.document-center.com.  Or you may prefer to contact us by phone (650-591-7600), fax (650-591-7617) or email (info@document-center.com).  Our expert staff is here to help you.