ASTM B853-16(2021)e1 PDF

Overview

ASTM B853-16(2021)e1: Standard Specification for Powder Metallurgy (PM) Boron Stainless Steel Structural Components defines the requirements for stainless steel structural components produced by powder metallurgy processes. Developed by ASTM International, this standard specifically targets PM components fabricated from prealloyed powders mainly composed of iron, chromium, nickel, molybdenum, and boron. These components are specially designed for use in corrosive environments, offering enhanced durability and strength. The standard covers critical specifications such as minimum density, chemical composition, physical and mechanical properties, and the appropriate testing methods to ensure reliable performance for end users.

Key Topics

• Material Composition:

  • Prealloyed powder consisting primarily of iron, chromium (22.0-24.0%), nickel (17.0-19.0%), molybdenum (3.0-4.0%), and boron (0.20-0.50%)
  • Strict limits on impurities like carbon (0.05% max), manganese (2.00% max), phosphorus (0.03% max), sulfur (0.03% max), silicon (1.0% max), and nitrogen (0.10% max)
  • Chemical analysis methods referenced: ASTM E354, E572, E1019, and E1086

• Physical Properties:

  • Sintered density requirement: minimum 7.7 g/cm³
  • Density measurement in accordance with ASTM B311

• Mechanical Properties:

  • Typical mechanical performance: 0.2% offset yield strength of 33,000 psi (228 MPa), ultimate tensile strength of 76,000 psi (520 MPa), elongation of 23%, and hardness of 75 HRB
  • Mechanical testing protocols and quality control agreed upon by producer and purchaser

• Manufacturing Process:

  • Components produced by cold pressing and sintering of prealloyed powder mixtures
  • Sintering temperature adjusted according to powder chemistry for optimal properties

• Quality Assurance & Compliance:

  • Requirements for certification, inspection, and chemical analysis upon purchaser’s request
  • Supplementary corrosion tests (intergranular, pitting, and salt spray) available as specified

Applications

ASTM B853-16(2021)e1 applies to industries and manufacturers utilizing stainless steel PM structural components for their superior corrosion resistance and mechanical strength. Typical application areas include:

• Automotive components: Gears, brackets, and fittings exposed to harsh chemicals or moisture
• Chemical processing: Equipment parts subject to corrosive conditions
• Marine environments: Structural components requiring resistance to saltwater and atmospheric corrosion
• Food processing and medical devices: Situations where hygiene and corrosion resistance are critical

The specification ensures that PM structural components meet stringent quality criteria, leading to reliable performance, extended service life, and predictable properties in corrosive service environments.

Related Standards

Organizations working with ASTM B853-16(2021)e1 may also reference related standards to ensure full compliance and integration into quality management systems:

• ASTM B243: Terminology of Powder Metallurgy
• ASTM B311: Test Method for Density of Powder Metallurgy Materials Containing Less Than Two Percent Porosity
• ASTM E8: Tension Testing of Metallic Materials
• ASTM A262: Detecting Susceptibility to Intergranular Attack in Austenitic Stainless Steels
• ASTM B117: Salt Spray (Fog) Testing
• ASTM G48: Pitting and Crevice Corrosion Resistance Testing
• ASTM E354, E572, E1019, E1086: Various methods for chemical analysis of metal alloys

Adherence to these standards supports robust testing, accurate material verification, and improved component reliability across demanding industries.

Keywords: powder metallurgy, boron stainless steel, PM components, corrosion resistance, structural components, ASTM B853, prealloyed powder, mechanical strength, sintering, material specification