ASTM B572-24
Standard Specification for Heat and Corrosion Resistant High Temperature Alloy Bar or Rod
- Standard No.
- ASTM B572-24
- Release Date
- 2024
- Published By
- American Society for Testing and Materials (ASTM) US / ASTM
- Latest
- ASTM B572-24
- Introduction
Analysis of the Standard's Core Content
ASTM B572-24 specifies the technical requirements for four high-temperature, corrosion-resistant alloy bars: N06002, N06230, N12160, and R30556. Major updates to the latest version include an expanded diameter specification range (including new tolerances for cold-worked materials), optimized heat treatment instructions, and improved chemical analysis sampling guidelines.
Comparison of Key Performance Indicators
UNS Number Tensile Strength (MPa) Yield Strength (MPa) Elongation (%) Typical Applications N06002 ≥660 ≥240 35 Chemical Reactors, Heat Exchange Tubes N06230 ≥760 ≥310 40 Gas turbine combustor R30556 ≥690 ≥310 40 Aerospace engine components
Manufacturing process requirements
The standard specifies five processing states: hot rolled annealed and peeled bar, hot rolled annealed and polished bar, hot rolled annealed and polished bar, cold rolled annealed bar, and cold rolled annealed and polished bar. Among them, N06230 needs to be solution treated at 1204-1246℃ and then rapidly cooled, while R30556 requires solution treatment above 1150℃.
Key points of dimensional tolerances
- Diameter tolerance of hot-rolled bars: Φ25.4-50.8mm is +0.79/-0.41mm
- Roundness error of cold-rolled polished bars: ≤0.05mm
- Straightness formula: curvature = 0.04×length (cm)
Implementation suggestions
Material selection guidance
For high temperature environments above 980℃, it is recommended to use N06230 alloy with a tungsten content of 13-15%; under sulfur-containing corrosion conditions, the molybdenum content (8-10%) of N06002 can provide better corrosion resistance.
Testing Notes
- Chemical analysis shall be conducted in accordance with B880, with at least one test performed per melt.
- The sampling direction for mechanical properties samples shall be consistent with the rolling direction.
- Two samples shall be taken from different locations within the same batch for retesting.
Standard Evolution Analysis
Compared to the 2016 version, the major technical changes in B572-24 include: the removal of specific parameters for solution treatment (replaced with manufacturer recommendations), the addition of a table of diameter tolerances for cold-worked materials, and the improvement of chemical analysis sampling clauses (clarifying that additional sampling requirements must be agreed upon in the contract). These changes reflect the industry's higher requirements for material and process flexibility and testing traceability.
ASTM B572-24 Referenced Document
- ASTM B880 Standard Specification for General Requirements for Chemical Check Analysis Limits for Nickel, Nickel Alloys, and Cobalt Alloys
- ASTM B899 Standard Terminology Relating to Non-ferrous Metals and Alloys
- ASTM E1473 Standard Test Methods for Chemical Analysis of Nickel, Cobalt, and High-Temperature Alloys
- ASTM E29 Standard Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications
- ASTM E55 Standard Practice for Sampling Wrought Nonferrous Metals and Alloys for Determination of Chemical Composition
- ASTM E8/E8M Standard Test Methods for Tension Testing of Metallic Materials*， 2025-07-01 Update
ASTM B572-24 history
- 2024 ASTM B572-24 Standard Specification for Heat and Corrosion Resistant High Temperature Alloy Bar or Rod
- 2016 ASTM B572-06(2016) Standard Specification for UNS N06002, UNS N06230, UNS N12160, and UNS R30556 Rod
- 2006 ASTM B572-06(2011) Standard Specification for UNS N06002, UNS N06230, UNS N12160, and UNS R30556 Rod
- 2006 ASTM B572-06 Standard Specification for UNS N06002, UNS N06230, UNS N12160, and UNS R30556 Rod
- 2003 ASTM B572-03 Standard Specification for UNS N06002, UNS N06230, UNS N12160, and UNS R30556 Rod
- 1998 ASTM B572-98a Standard Specification for UNS N06002, UNS N06230, UNS N12160, and UNS R30556 Rod
