ASTM A990/A990M-23 PDF

Overview

ASTM A990/A990M-23 is a standard specification developed by ASTM International that covers the requirements for castings made from iron-nickel-chromium and nickel alloys designed for pressure-retaining parts in corrosive service environments. This specification ensures that alloy castings are produced with restricted melting processes, subjected to rigorous weldability qualifications, and assessed through non-destructive examinations (NDE) to ensure high performance and safety in aggressive industrial settings. These castings are commonly used where superior mechanical properties and enhanced resistance to corrosion are essential.

Key Topics

• Material Grades and Composition

  • The specification includes multiple grades of iron-nickel-chromium and nickel alloys, each offering different degrees of corrosion resistance and mechanical properties.
  • Conformance to strict chemical composition limits is required for each heat of material, ensuring predictable alloy behavior in service.

• Manufacturing and Processing

  • Approved processes include electric arc or induction furnace melting, followed by advanced refining techniques (AOD or VOD) or melting of refined ingot.
  • No reclaimed or revert material is permitted except for certain nickel-based copper alloys.
  • Heat treatment procedures are specified for most grades to optimize microstructure and corrosion performance.

• Nondestructive Examination (NDE)

  • Four classes of NDE are detailed, combining visual inspection, radiographic analysis, and liquid penetrant testing, each with clearly defined acceptance criteria.
  • The required NDE class is to be specified by the purchaser; otherwise, the default Class D is applied.

• Weldability and Repair

  • Mandatory weldability qualification for each heat ensures that materials can be reliably joined and repaired.
  • All weld repairs must follow qualified welding procedures and use designated filler materials.
  • Solution heat treatment is required after significant weld repairs to restore corrosion resistance and mechanical properties.

Applications

• Pressure-Retaining Equipment

  • Essential for components such as valves, pump bodies, and piping systems operating under pressure in chemical processing, offshore, power generation, and other corrosive environments.

• Corrosive Service

  • Ideally suited for use where resistance to seawater, acids, alkalis, and other aggressive media is vital to preventing equipment failure and ensuring operational safety.

• Industries Served

  • Chemical processing
  • Oil and gas (offshore platforms, refineries)
  • Power generation, including nuclear
  • Marine and desalination plants
  • Specialty manufacturing requiring high-integrity cast components

Related Standards

• ASTM A351/A351M - Austenitic castings for pressure-containing parts
• ASTM A703/A703M - General requirements for steel castings for pressure-containing parts
• ASTM A985/A985M - Steel investment castings for pressure-containing parts
• ASTM A494/A494M - Nickel and nickel alloy castings
• ASTM A743/A743M & A744/A744M - Iron-chromium-nickel corrosion-resistant castings
• ASTM A488/A488M - Welding qualifications for steel castings
• ASME/ANSI B16.34 - Valves, flanged, threaded, and welding end
• AWS Standards - Welding filler materials for nickel and stainless steels

By specifying ASTM A990/A990M-23, purchasers and manufacturers ensure that critical pressure-retaining cast components provide reliable service life and superior corrosion resistance in demanding applications. This standard supports international best practices in material selection, quality assurance, and regulatory compliance for pressure equipment in corrosive service.