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Material Specification

AISI 347

AISI 347 Fasteners
Niobium/Columbium-Stabilized Austenitic Stainless Steel

Austenitic Stainless Steel AISI 347 Fasteners

Buy AISI 347 bolts, studs, and nuts conforming to ASTM A193 B8C, ASTM A276, and ISO 3506 for service at 400-800°C.

Exotic Alloy fasteners offer AISI 347 bolts, nuts, and studs with standard and custom manufacturing to your exact project specifications. We cover AISI 347 hex bolts, heavy hex bolts, studs, stud bolts, hex nuts, washers, threaded rod, and custom drawing fasteners in metric (M3 to M120) and inch sizes (1/4" to 5") with coarse, fine, and extra-fine threads to ASME, ISO, and DIN standards.

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AISI 347 Bolting Products

AISI 347 Specifications & Standards

  • ASTM A193 / A194
  • ASTM A276 / A479
  • UNS S34700
  • ASTM F593 / F594
  • DIN EN ISO 10088-3 (1.4550 / X6CrNiNb18-10)
  • ISO 3506-1 / 3506-2
  • BS 970 / BS EN 10088
  • JIS G4303
AISI 347 Material Datasheet

AISI 347 Properties

Chemical Composition (AISI 347)
Elements C Mn P S Si Cr Ni Nb Fe
Min % - - - - - 17.00 9.00 0.80 Balance
Max % 0.08 2.00 0.045 0.030 1.00 19.00 13.00 1.10 Balance
Mechanical Properties (AISI 347)
Condition / Heat Treatment Tensile Strength (MPa) Yield Strength (MPa) Elongation (%) Hardness
Annealed (Soft) 550 - 650 220 - 290 40 - 55 % 150 - 180 HB / 80 - 88 HRB
Cold Drawn (Class 70) 700 450 25 % 190 - 220 HB / 90 - 95 HRB
Cold Drawn (Class 80) 800 600 15 - 20 % 240 - 280 HB / 22 - 29 HRC

AISI 347 Characteristics

  • Proven metallurgical corrosion resistance across chemical, atmospheric, and marine media
  • Superior ductility and high toughness from cryogenic depths (-196°C) to elevated temperatures
  • Standard austenitic Face-Centered Cubic (FCC) lattice ensuring non-magnetic characteristics
  • Excellent weldability and compatibility with standard industrial TIG/MIG welding techniques
  • Comprehensive compliance with global ASTM, ASME, DIN, ISO, and BS bolting specifications

AISI 347 Applications

  • High-integrity industrial bolting (hex bolts, heavy hex nuts, stud bolts, tie rods)
  • Chemical and petrochemical process piping, pressure vessels, and heat exchanger flanges
  • Food, beverage, brewery, and dairy processing sanitary machinery and conveyor systems
  • Architectural structural facades, marine railings, coastal cladding, and glass wall spider bolts
  • Cryogenic storage tanks, LNG transport valves, and pharmaceutical cleanroom equipment