1.4833, 309, 309S, 309H, Heat Resisting Austenitic Steel

• Customization: Available
• After-sales Service: Support
• Type: Heat Resisting Austenitic Steel
• Model NO.: Heat Resisting Steel
• Standard: AISI, ASTM, GB, JIS, DIN, BS
• Technique: Cold Drawn, Hot Rolled, Forged, Grinding, etc.
• Application: Structural Steel Bar, Tool Steel Bar, Die Steel Bar
• Surface Treatment: Polished
• Alloy: Alloy
• Special Use: Mold Steel, Free Cutting Steel, Cold Heading Steel
• Certificate: ISO, ABS, BV, CCS, Dnv, Lr, Gl, Mill Certificate
• Quality Inspection: Ut, Chemical Composition, Physical Properties/SGS
• Length: Normally 6m, or Produce as Requirements
• Diameter: 4mm - 600mm
• Diameter Tolerance: H9, H11, H13, K9, K11, K13 etc
• Heat Treatment: Quenched, Tempered, Annealed
• Surface Require: Black, Bright. Peeled and Polished, Annealed
• Transport Package: Seaworthy Packing/Wooden Box or at Client′s Requir
• Specification: Customized
• Trademark: OEM & ODM
• Origin: China
• HS Code: 7219350000
• Production Capacity: 1000 Ton/Month

Product Description

Product Description

   Stainless Steel 309

309, 309S, and 309H are high-performance austenitic heat-resistant stainless steels specifically engineered for applications requiring exceptional oxidation resistance at elevated temperatures. With a high chromium content (22-24%) and moderate nickel content (12-15%), these versatile alloys provide outstanding resistance to oxidation up to 1900°F (1038°C) under non-cyclic conditions and approximately 1850°F (1010°C) under frequent thermal cycling.

The 309 family of stainless steels offers superior resistance to high-temperature oxidizing environments and sulfur-containing atmospheres, making them ideal materials for thermal processing equipment, industrial furnaces, waste treatment facilities, and other applications where component integrity must be maintained under extreme thermal conditions.

Each grade within the 309 family serves specific purposes:

• 309: The standard grade with carbon content up to 0.20%, providing good high-temperature strength and oxidation resistance.
• 309S: A low-carbon variant (≤0.08% C) that improves weldability and reduces susceptibility to carbide precipitation during welding or extended exposure to elevated temperatures.
• 309H: Features a controlled carbon range (0.04-0.10% C) for enhanced creep resistance and high-temperature strength, making it ideal for load-bearing components in high-temperature environments.

Due to their high chromium and low nickel content, 309-series stainless steels are particularly effective in sulfur-containing atmospheres up to 1832°F (1000°C). While they offer moderate resistance to carbon absorption, they are not recommended for highly carburizing environments. These alloys can be used in slightly oxidizing, nitriding, cementing, and thermal cycling applications, though maximum service temperatures should be adjusted accordingly. We supply premium 309, 309S, and 309H stainless steel in various forms to meet the demanding requirements of high-temperature applications across multiple industries. Our materials provide reliable performance in the most challenging thermal environments while maintaining good fabricability and weldability.

Chemical Composition 

Weight % (all values are maximum unless a range is otherwise indicated)

Element	309S
Cr	22.0-24.0
Ni	12.0-15.0
C	0.2 max
Mn	2.0 max
P	0.045 max
S	0.03 max
Si	0.75 max

Mechanical Properties
Values at 68°F (20°C) (minimum values, unless specified)

0.2% Offset Yield Strength		Ultimate Tensile Strength		Elongationin 2"	Hardness
Psi(min)	Mpa	Psi(min)	Mpa	%	HBN (max)
45,000	310	85,000	586	50	202

Applications
309, 309S, and 309H stainless steels are widely utilized in high-temperature applications where exceptional oxidation resistance, thermal stability, and resistance to sulfur-containing atmospheres are critical requirements. Their unique combination of properties makes them ideal for components exposed to extreme thermal conditions across various industries.

Primary applications for 309, 309S, and 309H stainless steels include:

• Thermal Processing Equipment:
  • Annealing covers and boxes
  • Muffles and retorts
  • Burners and burner grids
  • Lead pans and neutral salt pots
  • Furnace fans, doors, and shafts
  • Walking beams
  • Radiant tubes for aluminum and steel annealing
  • Brazing fixtures and carbon saggers
  • Recuperators and heat exchangers
• Waste Treatment:
  • Waste incinerators
  • Rotary kilns and calciners
  • Combustion chambers
• Power Generation:
  • Pulverized coal burners
  • Power boiler tube hangers
  • Heat recovery systems
• Petroleum Refining:
  • Catalytic recovery systems
  • Recuperators
  • High-temperature piping components
• Fluidized Bed Systems:
  • Grids
  • Piping
  • Wind boxes
• Glass Manufacturing:
  • Glass forming equipment
  • Melting tank components
• Paper Mill Equipment:
  • Recovery boiler components
  • High-temperature conveying systems
• Measurement and Control:
  • Thermowells
  • Temperature sensors housing
• Structural Components:
  • Refractory anchor bolts
  • High-temperature structural supports

309S is typically selected when fabrication requirements, particularly welding, are critical to application success, while 309H is preferred for structural components requiring maximum creep resistance at elevated temperatures. Standard 309 provides a balance of properties suitable for many general high-temperature applications.

These alloys are particularly valuable in environments where resistance to both high-temperature oxidation and sulfidation is required, providing reliable performance in some of the most demanding thermal conditions encountered in industrial applications.

 

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