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  • 309/309S Stainless Steel Plate

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309/309S Stainless Steel Plate
309 is a high-alloy austenitic stainless steel with significantly elevated Chromium (Cr) and Nickel (Ni) content. This composition provides outstanding resistance to oxidation and cyclic oxidation (thermal cycling) at high temperatures, outperforming common grades like 304/310S. The 309S variant has a lower carbon content, which minimizes carbide precipitation during welding and high-temperature service, making it the preferred choice for most welded fabrications.
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◉ PRODUCT SPECIFICATION


1. Standard Designations


  • 309: UNS S30900 / ASTM A240

  • 309S: UNS S30908 / ASTM A240 (**

  • EURONORM: 1.4828 (Approximately)

  • JIS: SUH 309 / SUS 309S

  • GB/T: 12Cr23Ni13 (309) / 022Cr23Ni13 (309S, approximately)


2. Chemical Composition (% by weight, Key Difference)


Element

Carbon (C)

Silicon (Si)

Manganese (Mn)

Phosphorus (P)

Sulfur (S)

Chromium (Cr)

Nickel (Ni)

309

0.20 max

0.75 max

2.00 max

0.045 max

0.030 max

22.00 - 24.00

12.00 - 15.00

309S

0.08 max

0.75 max

2.00 max

0.045 max

0.030 max

22.00 - 24.00

12.00 - 15.00

Note: The key difference is the maximum Carbon content. 309S's low carbon provides superior resistance to intergranular corrosion.


3. Mechanical Properties (at Room Temperature, for Annealed Condition)


Property

Yield Strength (0.2% Offset)

Tensile Strength

Elongation (in 2")

Hardness (Brinell)

Value

≥ 205 MPa (30 ksi)

≥ 515 MPa (75 ksi)

≥ 40%

≤ 217 HBW


4. High-Temperature Properties


This is the primary application area for 309/309S.

  • Recommended Continuous Service Temperature: Up to 1095°C (2000°F) for intermittent service and 1010°C (1850°F) for continuous service in oxidizing atmospheres.

  • Oxidation Resistance: Excellent, due to high chromium content which forms a stable, protective chromia scale.

  • Cyclic Oxidation Resistance: Superior to 310S in applications involving repeated heating and cooling cycles.


5. Physical Properties (Typical)


Property

Value

Density

7.98 g/cm³ (0.288 lb/in³)

Melting Range

1400 - 1450 °C (2550 - 2650 °F)

Modulus of Elasticity

200 GPa (29 x 10⁶ psi)

Thermal Conductivity (100°C)

14.0 W/m·K

Coefficient of Thermal Expansion (20-100°C)

14.9 x 10⁻⁶ /K


6. Corrosion Resistance


  • High-Temperature Oxidation: Primary strength, excellent resistance to scaling.

  • General Corrosion: Good resistance to many oxidizing chemicals and atmospheric conditions at room temperature.

  • Intergranular Corrosion: 309S offers significantly better resistance in welded and high-temperature applications compared to standard 309.


7. Available Product Range (Plates)


Parameter

Standard Range

Thickness

1.0 mm (0.04") to 50 mm (2") and above

Width

1000 mm (39"), 1219 mm (48"), 1500 mm (59"), etc.

Length

2000 mm (79"), 2438 mm (96"), 3000 mm (118"), etc.

Common Surface Finishes

No. 1: Hot-rolled, annealed & pickled (dull, matte)


8. Typical Applications


  • Furnace Components: Heat treatment fixtures, radiant tubes, muffles.

  • Thermal Processing: Refinery and chemical furnace parts, oven liners.

  • Welding Consumables: Used as filler metal for welding dissimilar metals (e.g., mild steel to stainless steel) and for cladding.

  • Kiln Furniture: Supports and fixtures in ceramic and sintering industries.

◉ Surfcae selection

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SURFACE CHARACTERISTIC SUMMARY OF MANUFACTURING METHOD APPLICATION
NO.1 Silvery white Hot rolled to specified thickness Do not need to have a glossy surface use
lackluster
NO.2D Silvery white After cold rolling, heat treatment and pickling are carried out General material, deep material
NO.2B Gloss is stronger than No.2D After No.2D treatment, the final light cold rolling is carried out through the polishing roller The general material
BA As bright as a sixpence No standard, but usually a bright annealed surface with high reflectivity. Building materials, kitchen utensils
NO.3 Rough lapping Grind with 100~200# (unit) strop tape Building materials, kitchen utensils
NO.4 Intermediate grinding Polished surface obtained by grinding with 150~180# strop abrasive tape Building materials, kitchen utensils
NO.240 Fine lapping Grinding with 240# strop abrasive tape kitchenware
NO.320 Very fine grinding Grinding was carried out with 320# strop abrasive tape kitchenware
NO.400 The luster is close to BA Use 400# polishing wheel to grind General timber, building timber, kitchen appliances
HL Hairline grinding Suitable particle material for hair stripe grinding (150~240#) with many grains Building, construction material
NO.7 It's close to mirror grinding Use a 600# rotary polishing wheel to grind For art or decoration
NO.8 Mirror ultrafinish The mirror is ground with a polishing wheel Reflector, for decoration

◉ PRODUCTION AND WAREHOUSING

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