310 grade, is produced for heat resistance purposes. In normal conditions this grade is resistant up to 1100 °C degrees.

In the oxidising conditions, when the heat is constant maximum heat resistance can reach 1100 °C degrees, but if the heating is scattered thisgrade is recommenended up to 1030 °C degrees.

310S grade, is resistant to heat in both dry and moist environments. Due to lower Carbon (C) content, 310S grade has higher resistance to heat than 310. Also with its high Chromium (Cr) content, they also have good corrosion resistance in moist enviornments. Under normal conditions their corrosion resistance is great.

Their weldability is good with all the welding methods. Machinability is possible with the right tools, but it is more difficult than 304 grade. Cold forming is very good. All the mechanial properties are superior to many austenitic grades.

Alternative grades: AISI 309S, 314

Available forms: Round Bars, Flat Bars, Angles, Coils, Sheets, Strips, Welded Tubes, Profiles, Seamless Tubes.

Chemical Analysis

Chemical Compositions

Element % Present (in product form)
C, H, P, L TW* / TS*
Carbon (C) ≤0.10 ≤0.15
Silicon (Si) ≤1.50 ≤0.75
Manganese (Mn) ≤2.00 ≤2.00
Phosphorous (P) ≤0.045 ≤0.045
Sulfur (S) ≤0.015 ≤0.030
Chromium (Cr) 24.00 – 26.00 24.00 – 26.00
Nickel (Ni) 19.00 – 22.00 19.00 – 22.00
Nitrogen (N) ≤0.11
Iron (Fe) Balance Balance

Mechanical properties (at room temperature in annealed condition)

Product Form
C, H, P L TW* / TS*
Thickness a or diameter d (mm) a ≤ 12 d ≤ 25
Hardness HB max. 1) 2) 3) 192 192
Proof Strength3) Rp0.2 N/mm2 210 210 230
Rp1.0 N/mm2 230 230 270
Tensile Strength Rm N/mm2 500 – 700 500 – 700 min. 500
Elongation min. in % Long Products 351) 351) 334) / 355)
Flat Products 0.5 ≤ a/d < 3 334)5) 334)5) 354)5)6)
3 ≤ a/d 354)5) 354)5) 354)5)6)

Usage Areas

  • Food Processing
  • Furnaces – burners, doors, fans, piping and recuperators
  • Fluidized Bed Furnaces – coal combustors, grids, piping, wind boxes
  • Ore Processing/Steel Plants – smelter and steel melting equipment, continuous casting equipment
  • Petroleum Refining – catalytic recovery systems, flares, recuperators, tube hangers
  • Power Generation – coal gasifier internals, pulverized coal burners, tube hangers
  • Sintering/Cement Plants – burners, burner shields, feeding and discharging systems, wind boxes
  • Thermal Processing – annealing covers and boxes, burner grids, doors, fans, muffles and retorts, recuperators, walking beams