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Stainless Steel 309 / 309S / 309H Pipes & Tubes

High-temperature austenitic stainless steel with superior oxidation resistance — available in standard, low-carbon (309S), and high-creep strength (309H) variants.

Product Overview

Stainless Steel 309 is a highly alloyed austenitic stainless steel used for its excellent oxidation resistance, high-temperature strength, and creep resistance. Grade 309 provides better corrosion resistance to marine atmospheres than Grade 304. SS 309S is the low-carbon version, which minimizes carbide precipitation and improves weldability. Grade 309H is specifically designed for high creep resistance and strength in environments exceeding 1000°F. These grades are frequently used for furnace parts, boiler baffles, and heat exchangers.

Key Advantages & Features

Oxidation Resistance

Excellent resistance to oxidation in continuous service up to 1095°C (2000°F).

High Creep Strength

Maintains high strength and mechanical properties at elevated temperatures.

Corrosion Resistance

Superior resistance to sulfuric liquors and marine atmospheres.

Chemical Composition (%)
Grade C Mn Si Cr Ni P S
SS 309 0.20 max 2.0 0.75 22-24 12-15 0.045 0.030
SS 309S 0.08 max 2.0 0.75 22-24 12-15 0.045 0.030
SS 309H 0.04-0.10 2.0 0.75 22-24 12-15 0.045 0.030
Mechanical & Physical Properties
Property SS 309 SS 309S
Tensile Strength (MPa) min 585 515
Yield Strength 0.2% (MPa) min 275 205
Elongation (% in 50mm) min 40% 40%
Hardness (Rockwell B) max 95 HRB 95 HRB
Density (kg/m³) 7900 7900
Melting Range (°C) 1400-1455 1400-1455
International Equivalent Grades
Grade UNS No Werkstoff No. JIS BS
SS 309 S30900 1.4828 SUS 309 309S24
SS 309S S30908 1.4833 SUS 309S -
SS 309H S30909 - SUS 309H -
Pipe Weight Chart (ASME B36.19)
Size (NB) OD (mm) SCH 10 (kg/m) SCH 40 (kg/m) SCH 80 (kg/m)
1/2" 21.34 1.27 1.62 2.11
3/4" 26.67 1.69 2.20 2.90
1" 33.40 2.09 3.24 4.24
2" 60.33 3.93 5.44 7.48
4" 114.30 11.03 16.08 22.32
8" 219.08 21.21 42.55 64.64

Industrial Applications

Furnace Components

Burners, oven linings & high-temperature fans.

Boiler Baffles

Refractory anchor bolts & steam boiler parts.

Aircraft Engines

Engine exhaust parts & heating elements.

Frequently Asked Questions

SS 309 has exceptional oxidation resistance and can be used in continuous service at temperatures up to 1095°C (2000°F). For intermittent service, it can handle temperatures up to 1035°C (1900°F).

While both are high-temperature grades, SS 310 has higher Chromium and Nickel content, making it slightly more resistant to oxidation. However, SS 309 is more cost-effective and widely used for furnace parts and boiler baffles where extreme high-heat performance of 310 is not strictly required.

SS 309S is the low-carbon version (max 0.08% Carbon). Its primary advantage is that it prevents carbide precipitation during welding, which improves its weldability and maintains corrosion resistance in the heat-affected zone of the weld.

Yes, Grade 309 is noted for its high resistance to sulfur-bearing atmospheres. It performs significantly better than other austenitic grades like SS 304 or 316 when exposed to high-temperature sulfidation.

Absolutely. We provide SS 309 pipes and tubes in custom lengths and schedules. All our products come with MTC (Material Test Certificates), and we welcome Third-Party Inspections (TPI) from agencies like SGS, TUV, BV, or Lloyds.
Quick Specification
StandardASTM A312/A213
Sizes1/8" to 36" NB
Wall ThicknessSCH 10 to XXS
FormSeamless / Welded
FinishBA, 2B, NO.4
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