ASTM A193 B8A A320 B8A W 1.4307 AISI 304L

The ASTM specification A193 grade B8A or A320 grade B8A defines the technical characteristics of stainless steel hardware suitable for application in pressure vessels and in the presence of high or low temperature (service temperatures -196°C to 800°C); this type of hardware is widely used in the chemical petroleum extraction and energy plant sectors. It differs from ASTM A193 B8A A320 B8 by the fact that the parts in the finished state undergo solution treatment to achieve final hardness in the 90-192 HB range.

CHEMICAL COMPOSITION ASTM A193 B8A A320 B8A W 1.4307 AISI 304L


Element Content
C max 0.08
S max 0.03
P max 0.045
Yes max 1.0
Mn max 2.0
Cr 18.0-22.0
Ni 8.0-11.0

MECHANICAL CHARACTERISTICS ASTM A193 B8A A320 B8A W 1.4307 AISI 304L


Grade Size Rm min (MPa) Rp 0.2 min (MPa) E% min RA min
B8A All diameters 515 205 30 50

PHYSICAL PROPERTIES ASTM A193 B8A A320 B8A W 1.4307 AISI 304L


  • Bulk density: 7.9 g/cm³ at 20°C
  • Modulus of elasticity: 200,000 N/mm² at 20°C
  • Thermal conductivity: 14.6 W/m.K at 20°C
  • Specific heat: 500 J/g.K at 20°C
  • Coefficients of linear expansion: 16.5 (20° – 200°C), 17.5 (20° – 400°C), 18.5 (20° – 600°C)
  • Electrical resistivity: 0.73 Ω mm²/m at 20°C
  • Amagnetic: Yes

CORRESPONDENCE AND SPECIFICATIONS ASTM A193 B8A A320 B8A W 1.4307 AISI 304L


  • EN 10088/3: X2 Cr Ni 1811 X2 Cr Ni 1811
  • W: 1.4307 – 1.4306
  • JIS: G4303 – SUS304
  • AISI: 304 L
  • EN 3506-1/2: A2-50