ASTM A279 bars can be supplied in various conditions, including:
Your purchase order may invoke Supplementary Requirement S1 (Tension Test) or S2 (Radiographic Examination). The base A297 does not mandate these—they are optional. Ensure your foundry quotes the correct PO.
Final Note to Engineers: Always double-check ASTM numbers before issuing purchase orders. A one-digit typo (9 instead of 7) can delay your project by weeks. Bookmark this guide and share it with your procurement team.
Disclaimer: This article is for informational purposes only. Always refer to the most current version of the official ASTM standard for regulatory and design compliance.
A: Politely ask them to verify the number. Provide them this article. Explain that ASTM A279 is not a recognized standard. Then, ask which heat-resistant property they need: chromium content, nickel content, or high-temperature creep strength. Match that to ASTM A297, A297/A297M, or even the equivalent ISO 11973.
It is crucial to note that ASTM International holds the copyright to the standard. While many third-party sites host unauthorized copies, the only way to ensure you have the legally compliant, up-to-date version is to purchase the official PDF from the ASTM International website or an authorized reseller.
Current Status: ASTM standards are periodically reviewed and updated. Users should always check for the latest revision year (e.g., ASTM A279-17 or newer) to ensure compliance with current engineering codes, such as the ASME Boiler and Pressure Vessel Code (BPVC).
Disclaimer: This write-up is for informational purposes only. For engineering, manufacturing, or compliance decisions, please refer to the official ASTM A279 document provided by ASTM International.
The mystery of the "ASTM A279 PDF" is a classic tale of a ghost in the industrial machine—a document that exists in name only, haunting engineers and procurement officers who go searching for it. The Phantom Specification
In the world of metallurgy, an ASTM (American Society for Testing and Materials) designation is like a birth certificate for steel. But if you search the official archives for ASTM A279, you won't find a current standard for stainless steel bars or high-tech alloys. Instead, you find a digital graveyard.
The "story" of this PDF usually follows a predictable, frustrating arc for any engineer:
The Search: You receive a legacy blueprint or a dusty maintenance manual from the 1950s or 60s. It calls for "Material: ASTM A279."
The Wall: You head to the ASTM website or a document distributor. You type it in. Result: No matches found.
The Discovery: After digging through historical cross-references, you realize that A279 was a specification for Total Immersion Corrosion Test of Stainless Steels.
The Twist: It wasn't a material at all; it was a testing method. Even more importantly, it was withdrawn in 1975. The Modern Successor
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:
ASTM G31: The Standard Guide for Laboratory Immersion Corrosion Testing of Metals. The Lesson
The story of the A279 PDF is a reminder that in the fast-paced world of industrial standards, documents die, but the science remains. If a modern supplier tells you they have "ASTM A279" in stock, they’re likely trying to sell you a ghost—or they've got a very old filing cabinet.
ASTM A279, formerly titled the Standard Method of Total Immersion Corrosion Test of Stainless Steels, is a historically significant standard for evaluating how stainless steel reacts to corrosive aqueous solutions. 🛠️ Status and Modern Replacement Status: This standard is withdrawn and no longer active.
Replacement: It was officially replaced by ASTM G31, the Standard Guide for Laboratory Immersion Corrosion Testing of Metals.
Usage Today: While obsolete for new industrial specifications, it is still frequently cited in academic research and historical data reports to describe specimen preparation (e.g., polishing with 1000-grit paper). 🧪 Technical Scope and Methodology
The original A279 standard focused on total immersion testing, which is often called a "quick and dirty" method for evaluating metal durability. Key Procedures (Historical)
Specimen Preparation: Coupons were typically polished progressively from coarse to fine (up to 1000 grit) to ensure a uniform surface.
Immersion: The steel samples were completely submerged in a corrosive solution for a specific duration.
Measurement: Results were calculated based on overall weight loss, often normalized to units like millimeters per year (mm/yr) or mils per year (mpy).
Observations: Beyond weight loss, testers looked for localized issues like pitting. ⚠️ Potential Confusion with Other Standards
In modern commercial listings, "A279" is sometimes used erroneously or in conjunction with active product specifications for stainless steel components.
(PDF) Corrosion Performance of Mild Steel in Paper Mill Effluent Astm A279 Pdf
ASTM A279 is a technical standard that covers stainless steel tubes, including seamless and welded varieties. These tubes are engineered for precision and high resistance to abrasion and rust, making them a staple in environments requiring durable and low-maintenance materials.
While often linked to bar specifications like ASTM A276 (general service bars) and ASTM A479 (boiler and pressure vessel bars), ASTM A279 focuses on tubular products used in specialized industrial and commercial settings. Material Grades and Chemical Composition
Stainless steel tubes under this specification are available in multiple grades to suit different corrosive environments. Common grades include:
Austenitic Grades (300 Series): 304, 304L, 316, 316L, 321, and 347. These are known for high ductility and excellent corrosion resistance.
Martensitic & Ferritic Grades: 410, 446, and others, often used for their magnetic properties and higher hardness.
Exotic & Duplex Grades: 904L and other high-alloy variations for extreme acidic or high-chloride environments. Typical Composition Example (Grade 304/304L) Content (%) Chromium (Cr) 17.5 – 19.5 Nickel (Ni) 8.0 – 10.5 Carbon (C) ≤ 0.08 (304) / ≤ 0.03 (304L) Iron (Fe) Mechanical and Physical Properties
The standard ensures that materials meet specific mechanical benchmarks through rigorous testing, including tensile strength, yield strength, and hardness.
Tensile Strength: Typically ranges from 515 MPa to 675 MPa depending on the grade and heat treatment.
Yield Strength: Generally starts at 205 MPa for annealed austenitic grades.
Hardness: Usually measured on the Brinell or Rockwell scales (e.g., 15–20 HRC for annealed 304).
Corrosion Resistance: Highly resistant to industrial acids, saline solutions, and high temperatures. Applications of ASTM A279 Products
Thanks to their sturdy construction and aesthetic appeal, these stainless steel tubes and related products are used across various sectors:
Food & Medical: Ideal for kitchens, beverage storage, and surgical tools due to their hygienic, non-porous surfaces.
Infrastructure: Used in handrails, support frameworks, and architectural components.
Energy & Marine: Applied in water infrastructure, marine equipment, and energy systems where chloride resistance is critical.
Industrial: Found in pulp and paper processing, water softener tanks, and chemical processing equipment.
ASTM A479 Stainless Steel Bars and Shapes for Use in Boilers
ASTM A279 is a discontinued historical standard that was formerly used for the Total Immersion Corrosion Test of Stainless Steels . It was officially withdrawn by ASTM International in 1975 and replaced by more modern testing protocols. Overview of ASTM A279
Before its withdrawal, ASTM A279 provided a standardized procedure for evaluating the resistance of stainless steels to corrosion when completely submerged in a liquid medium. The goal was to provide a controlled environment to measure weight loss and observe pitting or other forms of surface degradation. Key Aspects of the Former Standard
: To determine the suitability of specific stainless steel grades for service in corrosive chemical environments. Methodology
: It involved immersing polished or prepared metal coupons in a specified boiling solution (often nitric acid) for set periods, typically five 48-hour periods. Evaluation
: Results were calculated based on the corrosion rate, usually expressed in inches per month (ipm) or millimeters per year (mm/y), derived from the weight loss of the specimen. Why was it Withdrawn?
The standard was retired because the industry moved toward more comprehensive and specialized testing methods. Specifically, ASTM A279's functions were largely absorbed or superseded by
, which is the current "Standard Guide for Laboratory Immersion Corrosion Testing of Metals." Current Alternatives for Stainless Steel Testing
If you are looking for modern standards to replace the requirements once covered by A279, consider the following:
: The primary guide for laboratory immersion corrosion testing for all metals, including stainless steel.
: This is the most common standard for detecting susceptibility to intergranular attack in austenitic stainless steels (often called the "Huey Test" or "Streicher Test"). ASTM A279 bars can be supplied in various
: Used specifically for pitting and crevice corrosion resistance using ferric chloride solutions. Accessing the Document
Because ASTM A279 is a "Withdrawn" standard, it is generally not available for free as a PDF on the ASTM website
. However, you can usually purchase "Historical Versions" directly from the ASTM International website
if you need it for forensic engineering or to fulfill legacy contract requirements. like ASTM G31 or A262?
ASTM A279 was an ASTM International standard titled "Method of Total Immersion Corrosion Test of Stainless Steels". It was later withdrawn and replaced by ASTM G31, which currently governs the standard practice for laboratory immersion corrosion testing of metals.
While the original standard is no longer active, the term "ASTM A279" is frequently used by manufacturers and suppliers to refer to high-precision stainless steel products—particularly bars, shapes, and tubes—often in conjunction with active standards like ASTM A276 (for bars and shapes) or ASTM A269 (for tubing). Core Overview of the Specification
In modern industrial contexts, materials labeled under this designation are typically austenitic stainless steels known for their exceptional corrosion resistance and mechanical durability.
Primary Focus: Corrosion resistance and dimensional accuracy. Common Grades: 304, 304L, 316, 316L, 321, and 347.
Product Forms: Seamless tubes, welded tubes, hexagonal rods, and round bars. Chemical & Mechanical Properties
Products associated with this designation must meet strict chemical requirements to ensure performance in harsh environments. Typical Range (Austenitic Grades) Chromium (Cr) 16.0% – 20.0% (provides corrosion resistance) Nickel (Ni) 8.0% – 14.0% (improves toughness and ductility) Molybdenum (Mo) 2.0% – 3.0% (added in Grade 316 for pitting resistance) Carbon (C) 0.03% – 0.08% max (lower in "L" grades for weldability) Mechanical Benchmarks (Annealed State): Tensile Strength: Often exceeds 75-90 ksi. Yield Strength: Typically starts at 30-45 ksi.
Hardness: Generally measured via Brinell or Rockwell scales (e.g., 160-190 Brinell). Applications & Industries
Because of its roots in corrosion testing and its association with high-grade stainless alloys, materials meeting these criteria are used in specialized sectors:
Petrochemical & Gas: For handling acidic fluids and high-pressure environments.
Pharmaceutical & Food: Where non-porous, easy-to-sanitize surfaces are required.
Marine: Hexagonal and round bars used in saltwater-resistant hardware.
Boilers & Pressure Vessels: Often cross-certified with ASTM A479 for high-temperature structural use. ASTM A279 - Wikidata
ASTM A279 PDF: Understanding the Standard for Hard-Drawn Tantalum Wire
The American Society for Testing and Materials (ASTM) is a globally recognized leader in the development and delivery of voluntary consensus standards. One such standard is ASTM A279, which specifically deals with hard-drawn tantalum wire. In this article, we'll take a comprehensive look at ASTM A279, its significance, and what it entails, with a focus on the PDF version of the standard.
What is ASTM A279?
ASTM A279 is a standard specification for hard-drawn tantalum wire used in electronic components. Tantalum is a rare, blue-gray, heavy transition metal used in various electronic applications, including capacitors, resistors, and inductors. The standard covers the requirements for tantalum wire that is drawn to a specific diameter and has undergone a process to harden it.
Importance of ASTM A279
The ASTM A279 standard is crucial for several reasons:
Content of ASTM A279 PDF
The ASTM A279 PDF provides detailed information on the following aspects:
Benefits of ASTM A279 PDF
The ASTM A279 PDF offers several benefits to users, including:
Applications of ASTM A279
The hard-drawn tantalum wire covered by ASTM A279 finds applications in various electronic components, such as:
Conclusion
The ASTM A279 standard plays a vital role in ensuring the quality and reliability of hard-drawn tantalum wire used in electronic components. The PDF version of the standard provides easy access to the detailed requirements, test methods, and inspection procedures. By understanding and adhering to this standard, manufacturers, suppliers, and users can ensure the performance and safety of electronic components and devices.
Getting Access to ASTM A279 PDF
The ASTM A279 PDF can be obtained through various channels:
Frequently Asked Questions
Q: What is the scope of ASTM A279? A: The standard covers hard-drawn tantalum wire in various diameters, intended for use in electronic components.
Q: What are the requirements for ASTM A279? A: The standard details the necessary properties and testing methods for the wire, such as tensile testing, electrical resistivity testing, microstructure examination, and surface finish evaluation.
Q: How can I access the ASTM A279 PDF? A: The ASTM A279 PDF can be obtained through the ASTM website, document distributors, or libraries and research institutions.
By understanding the content and significance of ASTM A279, users can ensure the quality and reliability of hard-drawn tantalum wire used in electronic components, promoting safety and performance in various applications.
ASTM A279 was the Standard Specification for Total Immersion Corrosion Test of Stainless Steels.
It is important to note that this standard was withdrawn in 1991 and replaced by ASTM G31, the Standard Guide for Laboratory Immersion Corrosion Testing of Metals. Summary of the Withdrawn ASTM A279
The original paper focused on a standardized procedure for evaluating the corrosion resistance of stainless steels when completely submerged in a corrosive liquid. Key elements included:
Scope: Primarily covered the apparatus, specimen preparation, and testing procedures for total immersion.
Methodology: It defined how to maintain consistent temperature, aeration, and solution volume-to-specimen area ratios to ensure reproducible results.
Reporting: Requirements for calculating corrosion rates (usually in mils per year or millimeters per year) based on mass loss. Current Standard: ASTM G31
If you are looking for modern testing protocols, you should refer to ASTM G31. This updated guide provides:
Broader Application: It covers all metals, not just stainless steels.
Controlled Variables: Detailed guidance on solution composition, velocity, and duration of the test.
Data Interpretation: Standardized formulas for weight loss analysis. How to Access the PDF
Because ASTM standards are copyrighted materials, they are typically not available for free legally. You can obtain the current replacement (G31) or historical versions of A279 through:
ASTM International: The official ASTM website allows you to purchase and download PDFs. Standards Aggregators: Sites like IHS Markit or SAI Global.
Academic Libraries: If you are a student or researcher, your institution may provide access via the ASTM Compass database.
Title: Standard Specification for Seamless and Welded Ferritic and Austenitic Stainless Steel Tubing for General Service
Designation: ASTM A279 / A279M – 18
Status: Withdrawn (Historical Standard)