ASTM A370 Challenges and Changes
ASTM A370 is one of two major metals testing standards, with the other being ASTM E8. In terms of testing equipment and test methods, ASTM A370 refers to ASTM E8 for guidance. However, ASTM A370 further defines specimen characteristics of steels specific to several product types. These products, along with some procedural clarification, are annexed in the standard and include bar, tube, fasteners, and round wire. Specimen geometries can range from milled round, flat, or as manufactured. In addition to tension tests, the standard also discusses charpy impact, bend tests, and Brinell and Rockwell hardness tests. These tests fall under standards ASTM E-23, ASTM E190, ASTM E10, and ASTM E18.
Because ASTM A370 testing is conducted on such a wide variety of steel products and specimen geometries, system force requirements can differ greatly. Instron's Industrial Series offers test frames suitable for testing machined stainless steel rounds (300kN) all the way up to thick wall tubular products (2000kN). The Industrial Series load frames include high-stiffness ball screws, columns, strain gauge load measurement, and backlash elimination for durability. These features contribute to better performance by producing more accurate results and minimizing the energy stored during a test, which is especially evident when testing high-strength materials such as spring wire and large diameter fasteners. In addition to the Industrial Series hydraulic solutions for ASTM A370, Instron offers several robust electromechanical test systems from 100kN to 600kN suitable for testing a broad range of metals.
Gripping challenges exist particularly with high tensile strength, high hardness materials that can be overcome with custom gripping solutions to reduce slippage, and increase grip jaw life.
Recent changes in the specification have moved both rebar and wire strand testing to their respective product standards ASTM A615 and ASTM A1061.
To learn more, read our Definitive Guide and watch the webinar below:
Built on our trusted AVE 2 Advanced Video Extensometer, AverEdge32™ is Instron’s latest innovation in providing best-in-class transverse strain accuracy for all sheet metal materials. AverEdge32 is an optional advanced feature of the AVE 2 that utilizes edge-detection technology to simultaneously measure transverse strain at 32 locations along the specimen gauge length. It then averages them in real time, resulting in a smooth and repeatable transverse strain value, which is essential to calculating the plastic strain ratio (r-value) of sheet metal. AverEdge32 has shown up to 20x reduction in variability, resulting in r-value results with sub-5% variance, similar to other material properties such as yield strength.
The AverEdge32 functionality can be easily added to any existing AVE 2 without affecting any other existing capabilities, providing a simple upgrade with minimal downtime or risk. It also eliminates the need for transverse marks on the specimen. Improved repeatability eliminates having to retest specimens, which also means reduced test times, reduced waste, elimination of production-stops, which allows product to ship on time and ultimately reduces cost.
Presentations & White Papers
- ISO 6892 Ambient Tensile Testing of Metallic Materials
- Sheet Metal Testing Challenges
- Rebar Tensile Testing Guide
Understanding r & n Value Testing
About Strain Measurement
Learn About the New ISO 6892-1:2016 Standard
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