303 Project 70®+

UNS #S30300

303 Project 70®+ stainless is an improved-machining version of 303 and the first chrome-nickel, free-machining stainless steel ever produced. It combines the superior machinability of Project 70®+ stainless with improved straightness and roundness at half-standard or ISO h9 dimensional tolerances. This drawn bar has been used successfully in a variety of machining operations including CNC Swiss-style screw machines. It enables machining speed improvements of 50% or more over AISI Type 303 and offers reduced tool wear and increased machine speeds and feeds to help improve productivity and reduce part costs. A good general purpose product for simple and complex parts at a wide range of machining speeds, this steel possesses nongalling properties that make disassembly of parts easy and help to avoid scratching or galling in moving parts.

Type Analysis

  • Carbon (Maximum) 0.12
  • Phosphorus (Maximum) 0.2
  • Silicon (Maximum) 1
  • Nickel (Nominal) 8.00-10.00
  • Manganese (Maximum) 2
  • Sulfur (Maximum) 0.15
  • Chromium (Nominal) 17.00-19.00
  • Iron (Nominal) Balance

Applications

shafts, valve bodies, valves, valve trim, and fittings

Applicable Specifications

  • ASTM A581
  • AMS 5640
  • ASTM A320
  • ASTM A582

Flats

Hexagons

Rod

Rounds

Square

Wire

Shapes

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