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321/321H Stainless Steel Plates

NG Industries are manufacturers, exporters & suppliers of SS 321/321H Plates. Grades 321/321H is the crucial austenitic 18/8 steel (Grade 304) settled by Titanium (321) increases. These assessments are used in light of the fact that they are not delicate to intergranular disintegration in the wake of warming within the carbide precipitation extent of 425-850°C. Grade 321/321H is the assessment of choice for applications in the temperature extent of up to around 900°C, joining brilliant, impenetrability to scaling and stage reliability with impenetrability to coming about liquid disintegration.

An obstacle with 321/321H is that titanium does not trade well over a high temperature bend, so is not endorsed as a welding consumable. Grade 347 is thusly the standard consumable for welding 321. Alloy 321H (UNS S 32109) is the higher carbon (0.04 – 0.10) version of the alloy. It was developed for enhanced creep resistance and for higher strength at temperatures above 1000oF (537°C). In most instances, the carbon content of the plate enables dual certification.

Features :

  • High tensile strength
  • Long service life
  • Resistant against corrosion
  • Highly machinable
  • Very strong and tough
  • Can be hardened by heat treatment
  • Magnetic


Steel GradesAISI347/ (1.4550) , AISI 347H ( 1.4961)
ProductionHot-Rolled (HR) / Cold-Rolled (CR)
StandardASTM A240 / ASME SA240
Thickness1.0mm – 100mm
ApplicationMedical equipment, Food industry, Construction material, Kitchen utensils, BBQ grill, Building construction, Electric equipment.

321/321H Stainless Steel Plates Chemical Properties

% Cr Ni C Si Mn P S N Ti Fe
321 min:17.0
min: 9.0
max:0.08 max:0.75 max:2.0 max:0.045 max:0.03 max:0.10 min:5*(C+N)
321H min:17.0
min: 9.0
max:2.0 max:0.045 max:0.03 max:0.10 min:5*(C+N)

321/321H Stainless Steel Plates Mechanical Properties

Grade Tensile Strength
ksi (min.)
Yield Strength 0.2%
Offset ksi (min.)
Elongation -
% in
50 mm (min.)
(Brinell) MAX
321 75 30 40 217

321/321H Stainless Steel Plates Physical Properties

Coefficient of
Thermal Expansion (min/in)-°F
Thermal Conductivity BTU/hr-ft-°F Specific Heat BTU/lbm -°F Modules of Elasticity (annealed)2-psi
at 68 °F at 68 – 212°F at 68 – 1832°F at 200°F at 32 – 212°F in tension (E)
0.286 9.2 20.5 9.3 0.12 28 x 106
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