Stainless Steel 310 & 309 — High-Temperature Grade Bars, Wire & Profiles
Ambica Steels supplies Grade 310 and Grade 309 austenitic stainless steel in bar, wire, hex, flat, and profile forms from its manufacturing facility in Wazirpur, New Delhi. Both grades are engineered for continuous service at high temperatures — SS 310 up to 1150°C and SS 309 up to 1095°C — making them the industry standard for furnaces, kilns, exhaust systems, and petrochemical processing equipment. As a certified ISO manufacturer, Ambica Steels offers Mill Test Certificates (MTC) and fast dispatch across India and internationally.
STAINLESS STEEL 310
Overview of Stainless Steel 310
Stainless Steel 310 is a high-temperature, austenitic stainless steel designed for excellent oxidation resistance scaling resistance, and strength at elevated temperatures.
Chemical Composition of Stainless Steel 310
| Element | Percentage (%) |
| Carbon (C) | 0.25 max |
| Chromium (Cr) | 24 – 26 |
| Nickel (Ni) | 19 – 22 |
| Manganese (Mn) | 2.0 max |
| Silicon (Si) | 1.5 max |
| Phosphorus (P) | 0.045 max |
| Sulfur (S) | 0.030 max |
| Iron (Fe) | Balance |
Mechanical Properties of Stainless Steel 310
| Property | Value |
| Tensile Strength | 520 MPa (min) |
| Yield Strength | 205 MPa (min) |
| Elongation | 40% (min) |
| Hardness (Brinell) | 217 HB max |
| Density | 7.9 g/cm³ |
| Melting Range | 1400 – 1450°C |
Physical Properties
| Property | Value |
| Thermal Conductivity | 14.2 W/m·K |
| Electrical Resistivity | 0.78 µΩ·m |
| Modulus of Elasticity | 200 GPa |
| Magnetism | Non-magnetic (slightly magnetic after cold work) |
Applications
SS 310 is ideal for high-temperature industrial use:
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Furnace parts & furnace muffles
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Heat exchangers
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Kiln linings & burners
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Thermal processing equipment
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Oil refinery components
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Power plant boilers
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Annealing covers
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Cryogenic structures
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Exhaust systems
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Chemical processing equipment
Equivalent Grades
| Standard | Grade |
| AISI / ASTM | 310 |
| EN | 1.4841 |
| JIS | SUS 310 |
| DIN | X15CrNi25-20 |
| IS | 310 |
310 Round Bars 310 Fine Wire
310 Hex Bars 310 Core Wire
310 Flat Bars 310 Cold Heading Wire
310 Square Bars 310 General Application Wire
310 Angle Bars 310 TIG Wire
310 MIG Wire
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STAINLESS STEEL 309
Overview of Stainless Steel 309
Stainless Steel 309 is a high-temperature, austenitic stainless steel grade designed for excellent oxidation resistance heat resistance, and scaling resistance.
Chemical Composition of Stainless Steel 309
| Element | Percentage (%) |
| Carbon (C) | 0.20 max |
| Chromium (Cr) | 22 – 24 |
| Nickel (Ni) | 12 – 15 |
| Manganese (Mn) | 2.0 max |
| Silicon (Si) | 1.0 max |
| Phosphorus (P) | 0.045 max |
| Sulfur (S) | 0.030 max |
| Iron (Fe) | Balance |
Mechanical Properties
| Property | Value |
| Tensile Strength | 550 MPa (min) |
| Yield Strength | 205 MPa (min) |
| Elongation | 40% (min) |
| Hardness (Brinell) | 217 HB max |
| Density | 7.9 g/cm³ |
| Melting Range | 1398 – 1454°C |
Physical Properties of Stainless Steel 309
| Property | Value |
| Thermal Conductivity | 14.2 W/m·K |
| Electrical Resistivity | 0.74 µΩ·m |
| Modulus of Elasticity | 190–200 GPa |
| Magnetism | Non-magnetic (may become slightly magnetic after cold working) |
Applications
SS 309 is used in high-temperature and industrial applications such as:
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Furnace parts & furnace linings
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Heat exchangers & reheating equipment
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Kiln components
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Burner nozzles
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Industrial ovens
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Exhaust systems
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Petrochemical processing equipment
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Thermal processing plants
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Annealing covers
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Boiler baffles
Equivalent Grades
| Standard | Grade |
| AISI / ASTM | 309 |
| EN | 1.4828 |
| JIS | SUS 309 |
| DIN | X15CrNi23-13 |
| IS | 309 |
Frequently Answer Questions
Q1. What is the maximum service temperature of Stainless Steel 310?
Stainless Steel 310 can withstand continuous service temperatures up to 1150°C (2100°F) in oxidising atmospheres, making it one of the highest-rated austenitic grades for sustained high-temperature exposure. For intermittent or cyclic heating conditions, the recommended maximum is slightly lower at around 1040°C (1900°F) to prevent sigma-phase embrittlement upon cooling. Its high chromium (24–26%) and nickel (19–22%) content form a stable, adherent oxide layer that resists scaling even at these extreme temperatures — which is why SS 310 is the preferred material for furnace parts, kiln linings, and heat treatment equipment worldwide.
Q2. Is stainless steel 310 magnetic?
In its annealed (solution-treated) condition, SS 310 is non-magnetic. It belongs to the austenitic family of stainless steels, which have a face-centred cubic (FCC) crystal structure that does not exhibit ferromagnetism. However, when SS 310 is subjected to significant cold working — such as drawing, bending, or machining — it can develop a slight magnetic response due to the formation of strain-induced martensite. This is a minor effect and does not indicate a change in grade or compromise the material's high-temperature performance. For applications where zero magnetic permeability is critical, specify annealed and solution-treated material.
Q3. What are the main applications of Stainless Steel 310?
SS 310 is specified wherever high temperature, oxidation resistance, and structural integrity must coexist. Key industrial applications include:
— Furnace and heat treatment equipment: furnace muffles, radiant tubes, furnace rolls, annealing covers, and retorts
— Kiln and cement industry: kiln linings, conveyor chains, and burner nozzles
— Power generation: boiler superheater tubes, coal gasification components, and heat exchangers
— Petrochemical processing: reformer tubes, catalyst beds, and thermal cracking units
— Automotive and exhaust systems: high-temperature exhaust manifolds and EGR components
— Cryogenic applications: SS 310 also performs well at very low temperatures due to its austenitic structure, making it suitable for liquefied gas equipment
— Chemical processing: vessels and pipework handling sulphur-bearing or oxidising chemicals at elevated temperatures
Q4. Is SS310 better than SS304 for high-temperature use?
Yes, for elevated-temperature service, SS 310 significantly outperforms SS 304. Here is why:
SS 304 has a maximum continuous service temperature of around 870°C (1600°F), beyond which it suffers rapid oxidation and scaling. SS 310, with its much higher chromium and nickel content, is rated for continuous service up to 1150°C (2100°F).
SS 310 also has better carburisation resistance — important in furnace atmospheres — and maintains its austenitic structure more reliably under thermal cycling. However, SS 304 is more widely available, lower in cost, and perfectly adequate for applications below 870°C. If your operating temperature exceeds that threshold, SS 310 is the appropriate upgrade.
Q5. How can I get a price quote for SS310 and SS309 from Ambica Steels?
Getting a quote from Ambica Steels is straightforward. You can reach us through any of the following channels:
— Online quote form: Use the "Get a Quote or Call Back" button on this page and submit your requirement details — grade, product form, size, quantity, and delivery location.
— Email: Send your enquiry to dm@ambicasteels.com or info@ambicasteels.com with your specification and required quantity.
— Phone: Call our sales team directly at +91 (11) 47034400 during business hours (Monday–Saturday, 9:30 AM – 6:00 PM IST).
Our technical team can also assist with grade selection, size confirmation, and compliance documentation requirements before you place an order. We dispatch from New Delhi (India) to serve customers globally.