ASTM B574-23 PDF

Overview

ASTM B574-23 is the Standard Specification developed by ASTM International for rod and bar products composed of low-carbon nickel-based alloys. This specification covers various alloy groups including nickel-chromium-molybdenum, nickel-molybdenum-chromium, nickel-molybdenum-chromium-tantalum, nickel-chromium-molybdenum-copper, and nickel-chromium-molybdenum-tungsten alloys. The standard provides requirements for chemical composition, mechanical properties, dimensions, workmanship, and testing for rods and bars intended for general corrosive service.

Primarily designed for use in environments with demanding corrosion resistance needs, ASTM B574-23 ensures the consistency, reliability, and quality of nickel alloy rods and bars within sizes ranging from 6.35 mm to 88.9 mm in diameter or dimension, as solution annealed, pickled, mechanically descaled, ground, or turned products.

Key Topics

• Alloy Types Covered: The standard applies to a range of UNS designations including N10276, N06022, N06035, N06044, N06455, N06058, N06059, N06200, N06210, N06686, and N10362.

• Product Forms:

  • Rods and bars 5/16 in. to 3/4 in. (7.94 mm to 19.05 mm): solution annealed and pickled or mechanically descaled
  • Rods and bars 3/4 in. to 3-1/2 in. (19.05 mm to 88.9 mm): solution annealed, ground, or turned
  • Rods and bars 1/4 in. to 3-1/2 in. (6.35 mm to 88.9 mm): solution annealed, cold worked, ground or turned (select alloys)

• Chemical Composition: Specifies strict requirements for total content of molybdenum, chromium, iron, tungsten, cobalt, carbon, and other relevant elements to ensure corrosion resistance and mechanical strength.

• Mechanical Properties:

  • Minimum tensile and yield strength
  • Minimum elongation
  • Room temperature performance is the basis for all mechanical requirements

• Dimensional Tolerances: Clearly defines permissible variations in dimension and out-of-roundness for cold-worked and solution-annealed products.

• Workmanship and Marking: Requirements ensure defect-free surfaces, uniformity in quality, proper marking of material, and traceable labeling for each order.

• Testing and Certification: Mandates specific procedures for chemical and mechanical testing, with detailed guidance on sampling, number of tests, specimen preparation, and retests.

Applications

ASTM B574-23 alloy rods and bars are vital in general corrosive service across industries where superior resistance to chemicals, oxidizing environments, and reducing media is essential. Typical applications include:

• Chemical Processing Plants: Components such as process piping, reaction vessels, and fittings exposed to harsh chemical environments
• Petrochemical and Oil & Gas Industries: Equipment and piping systems susceptible to sour gas, chlorides, and high temperature corrosive exposure
• Pharmaceutical and Biotechnology: Fabrication of clean-in-place equipment, reactors, and parts requiring minimal contamination and high corrosion resistance
• Pollution Control, Flue Gas Desulfurization: Ducting, scrubbers, and absorbers operating with acidic gases and condensates
• Power Generation, Marine, and Aerospace: High integrity fasteners, shafts, and structural components exposed to aggressive marine or industrial atmospheres

These nickel-based alloy rods and bars are selected for their durability, long service life, and compliance with stringent quality standards outlined in ASTM B574-23, ensuring safe operation in critical environments.

Related Standards

For those involved in procurement, fabrication, or inspection of nickel alloy rods and bars, several related ASTM documents and external standards provide complementary guidelines:

• ASTM B880: General Requirements for Chemical Check Analysis Limits for Nickel, Nickel Alloys and Cobalt Alloys
• ASTM B899: Terminology Relating to Non-ferrous Metals and Alloys
• ASTM E8/E8M: Test Methods for Tension Testing of Metallic Materials
• ASTM E1473: Test Methods for Chemical Analysis of Nickel, Cobalt, and High-Temperature Alloys
• ASTM E55: Practice for Sampling Wrought Nonferrous Metals and Alloys for Determination of Chemical Composition

Additionally, for code applications:

• ASME SB-574: Referenced for Boiler and Pressure Vessel Code compliance requirements.

Keywords: ASTM B574-23, nickel alloy rod, nickel alloy bar, corrosion resistant alloys, UNS N10276, UNS N06022, UNS N06686, mechanical properties, chemical composition, industrial nickel alloys, ASTM standards.