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Heat Resistant Steel | 310S | 309S | High Temp
BRAND: PROMISTEEL
GRADES: 310S, 309S, 1.4841, 1.4828, 1Cr25Ni20Si2
SHAPES: Heavy Plate, Round Bar, Seamless Pipe
DELIVERY CONDITION: Solution Annealed, Pickled
SURFACE: No.1 (Hot Rolled), 2B (Cold Rolled), Pealed
SERVICE TEMP: 900°C - 1150°C (Continuous)
FEATURE: Excellent Creep Resistance & Oxidation Resistance
APPLICATION: Furnace Parts, Boiler Tubes, Kiln Linings, Valves
MOQ: 5 Tons
Heat Resistant Steel (often referred to as High-Temperature Stainless Steel) is engineered to maintain structural stability and chemical integrity at elevated temperatures where standard structural steels would fail.
Our flagship grade, AISI 310S (1.4845 / 25Cr-20Ni), acts as the industry benchmark for high-temperature applications. With high levels of chromium (25%) and nickel (20%), it forms a robust protective oxide layer that resists scaling and oxidation up to 1150°C. It is widely used for manufacturing furnace components, boiler tubes, and heat exchangers that require high creep rupture strength (resistance to deformation under load over time).
Product Specifications & Grade Equivalents
We supply both ferritic (economical, up to 900°C) and austenitic (high strength, up to 1150°C) heat-resistant steels.
Table-1
Select the right alloy based on your maximum service temperature.
International Grade Comparison |
||||
| GB (China) | ASTM / AISI (USA) | DIN / EN (Germany) | JIS (Japan) |
Max Service Temp (Air) |
| 06Cr25Ni20 | 310S | 1.4845 (X8CrNi25-21) | SUH310S | 1150°C |
| - | 314 | 1.4841 (X15CrNiSi25-21) | SUH310 |
1150°C (High Silicon) |
| 06Cr23Ni13 | 309S | 1.4833 (X12CrNi23-13) | SUH309S | 1000°C |
| 1Cr25Si2 | 446 | 1.4762 (X10CrAlSi25) | SUH446 |
1100°C (Ferritic / High Sulfur Resist) |
| 4Cr10Si2Mo | H80 | 1.4718 (X45CrSi9-3) | SUH3 |
Exhaust Valve Steel |
Table-2
High Cr/Ni content ensures the material survives the "red hot" zone.
Chemical Composition (Mass Fraction %) |
|||||
| Grade | C | Cr | Ni | Si | Mn |
| 310S / 1.4845 | ≤0.08 | 24.0~26.0 | 19.0~22.0 | ≤1.50 | ≤2.00 |
| 309S / 1.4833 | ≤0.08 | 22.0~24.0 | 12.0~15.0 | ≤1.00 | ≤2.00 |
| 1.4841 (314) | ≤0.20 | 24.0~26.0 | 19.0~22.0 | 1.50~2.50 | ≤2.00 |
Note: High Silicon (Si) in 1.4841 further improves oxidation resistance
Table-3
Available in Heat Resistant Plates for furnace linings and bars for anchors.
Supply Range & Formats |
|||
| Product Form | Dimensions (mm) | Delivery Condition | Surface Finish |
| Heavy Plate | Thickness: 3 - 60 | Hot Rolled / Annealed |
No. 1 (White Pickled) |
| Round Bar | Dia: 10 - 250 | Forged/Rolled | Peeled/Turned |
| Seamless Pipe | OD: 20 - 219 | Cold Drawn / Annealed | Pickled |
| Valve Bar | Dia: 5 - 50 | Ground / Polished | h9 Tolerance |
Key Features and Advantages
Oxidation Resistance
The high Chromium content creates a tight, self-healing scale that prevents oxygen from penetrating and destroying the metal matrix, even at 1100°C.
Creep Strength
Unlike standard 304 stainless which deforms rapidly under load at high heat, Austenitic Heat Resistant Steels (310S) maintain high tensile strength at temperatures >600°C.
Thermal Fatigue Resistance
Designed to withstand cyclic heating and cooling without cracking (essential for heat treatment baskets and trays).
Carburization Resistance
Grades with high Nickel (like 310S) resist absorbing carbon from furnace atmospheres, preventing the material from becoming brittle.
Typical Applications
Heat Resistant Steel is the backbone of high-temperature processing industries:
- Industrial Furnaces: Linings, doors, fans, and muffle tubes for annealing and hardening furnaces.
- Petrochemical: Cracking tubes and pigtails in ethylene production.
- Power Generation: Superheater tubes, boiler supports, and coal burners.
- Cement & Ceramics: Rotary kiln parts and refractory anchors (uses 309S / 310S).
- Automotive: Exhaust valves (uses 4Cr10Si2Mo / SUH3).
FAQ
Q1: What is the difference between 309S and 310S?
A1: Temperature Limit & Nickel Content.
310S contains ~20% nickel and works up to 1150°C. It is the premium choice for extreme heat.
309S contains ~13% nickel and works up to 1000°C. It is more cost-effective for moderately high temperatures.
Q2: What is "creep" in steel?
A2: Creep is the slow, permanent deformation of a material under load at high temperatures. Standard steel will stretch and eventually fail over time in a hot furnace. Heat-resistant steels are specifically alloyed to resist this stretching, ensuring long service life.
Q3: Is 310S magnetic?
A3: No. 310S is austenitic, so it is non-magnetic in the annealed condition. However, ferritic heat-resistant steels (like 1Cr25Si2 / 446) are magnetic.
Q4: Can you supply heat-resistant steel for engine valves?
A4: Yes. We supply 4Cr10Si2Mo (SUH3) round bars, which is the standard martensitic heat-resistant steel used for manufacturing intake and exhaust valves in internal combustion engines.
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