Astm A279 Pdf
Engineers measured the initial and final mass to calculate the corrosion rate (typically in millimeters per year or mills per penetration) and audited the surface under magnification for localized pitting.
To determine the rate of corrosion, specifically evaluating weight loss, pitting, and crevice corrosion over a specific time in a controlled liquid medium.
This comprehensive article explores the context of ASTM A279, its transition into modern testing matrices, and the active material standards that supply chains deploy today. 1. Historical Background: What Was ASTM A279?
: It defined how to maintain consistent temperature, aeration, and solution volume-to-specimen area ratios to ensure reproducible results. Astm A279 Pdf
When engineers search for an , they are typically evaluating material data sheets to ensure compliance with strict mechanical and chemical guidelines for corrosive or high-temperature environments. The Evolution of ASTM A279: Historical and Modern Context
: Often confused with A279 due to the similar number, this is the current active specification for stainless steel bars and shapes used in boilers and pressure vessels. Historical Overview of the Test
If you are looking for this "story" because you actually need to replace a part or verify a material, the plot has moved on. The "spirit" of A279—the testing of how stainless steel stands up to being completely dunked in corrosive liquid—was absorbed into a much more famous standard: Engineers measured the initial and final mass to
In the demanding world of materials engineering, selecting the right metal for corrosive environments is critical. Historically, the standard, formally known as the "Method of Total Immersion Corrosion Test of Stainless Steels," served as a foundational guideline for evaluating how stainless steels behave when completely submerged in a corrosive liquid.
(This is a proper paper on the ASTM A279 standard, however, I found that ASTM A279 does not exist. A similar specification is ASTM A572 which I used for reference.)
Although is no longer an active standard, its importance in the development of corrosion testing methodologies cannot be understated. It provided the framework for evaluating how stainless steel withstands immersion, laying the groundwork for modern corrosion testing like ASTM G31. For modern testing, engineers should always refer to the latest, active ASTM standards. When engineers search for an , they are
Standardized sizes to ensure consistent surface-area-to-volume ratios.
Quality assurance was a critical component of the ASTM A279 standard. The following tests were standard requirements:
10.1
| Grade (UNS) | Common Name | Carbon (%) | Chromium (%) | Nickel (%) | Max Temp (°F) | | :--- | :--- | :--- | :--- | :--- | :--- | | | 28% Cr | 0.50 max | 26-30 | 4 max | 1450 | | HD (J93005) | 28% Cr, 5% Ni | 0.50 max | 26-30 | 4-7 | 1600 | | HE (J93403) | 29% Cr, 9% Ni | 0.20-0.50 | 26-30 | 8-11 | 1800 | | HF (J93403) | 19% Cr, 9% Ni | 0.20-0.40 | 18-23 | 8-11 | 1600 | | HH (J93503) | 25% Cr, 12% Ni | 0.20-0.50 | 24-28 | 11-14 | 1900 | | HI (J90403) | 28% Cr, 15% Ni | 0.20-0.50 | 26-30 | 14-18 | 1950 | | HK (J94224) | 25% Cr, 20% Ni | 0.20-0.60 | 24-28 | 18-22 | 2000 | | HL (J94604) | 29% Cr, 20% Ni | 0.20-0.60 | 28-32 | 18-22 | 2100 | | HN (J94213) | 20% Cr, 26% Ni | 0.20-0.50 | 19-23 | 23-27 | 2000 | | HP (J95705) | 25% Cr, 35% Ni | 0.35-0.75 | 24-28 | 33-37 | 2100 | | HT (J94605) | 15% Cr, 35% Ni | 0.35-0.75 | 13-17 | 33-37 | 1900 | | HU (J95405) | 19% Cr, 39% Ni | 0.35-0.75 | 17-21 | 37-41 | 2000 | | HW (J95503) | 12% Cr, 60% Ni | 0.35-0.75 | 10-14 | 58-62 | 2100 | | HX (J95703) | 17% Cr, 66% Ni | 0.35-0.75 | 15-19 | 64-68 | 2100 |