Stainless steel (SS) pipe specifications are defined by material grades like 304 and 316, dimensions using Nominal Pipe Size (NPS) and Schedule (Sch) wall thickness, and manufacturing standards like ASTM A312. Key Material Grades • Grade 304/304L: Standard austenitic steel containing roughly 18% chromium and 8% nickel; ideal for general corrosion resistance, food processing, and architectural uses. • Grade 316/316L: Includes molybdenum for superior resistance to chemicals, salt water, and marine environments. Dimensions and Sizing • Nominal Pipe Size (NPS): Standardized size indicator ranging from 1/8 inch to 36 inches or larger (outer diameter is fixed while inner diameter changes based on wall thickness). • Schedule (Sch): Wall thickness designation. Common stainless steel schedules include Sch 5S, Sch 10S, Sch 40S, and Sch 80S (the 'S' stands for stainless, denoting thinner walls optimized for corrosion-resistant systems). Manufacturing Standards • ASTM A312: Specification for seamless, welded, and heavily cold worked austenitic stainless steel pipes. • ASTM A213 / A269: Specifications commonly used for seamless and welded austenitic stainless steel boiler, superheater, and general service tubing. • Production Types: Available as Seamless (extruded solid round bar) or Welded / ERW (formed from strip and longitudinal weld seam). If you'd like, let me know:What application or industry (plumbing, structural, chemical) you need the pipe forThe approximate size and pressure requirementsI can help you select the exact grade and schedule. AI responses may include mistakes.