What is the equivalent material for Inox 310?

If you are looking for the equivalent material for Inox 310 stainless steel, the most commonly used international designations are AISI 310, UNS S31000, and EN 1.4841. For the low-carbon version, 310S corresponds to UNS S31008 and EN 1.4845. Because 310 and 310S have different carbon and silicon requirements, buyers should confirm the exact grade and product standard before placing an order.

 

What is Inox 310?

Inox 310 is an austenitic high-temperature stainless steel containing 24–26% chromium and 19–22% nickel, with a carbon content of ≤ 0.25% (≤ 0.08% for 310S). Capable of continuous operation at temperatures up to 1150°C, it is the material of choice for industrial furnace tubes, petrochemical cracking furnace tubes, and high-temperature heat exchanger tubes, offering excellent oxidation resistance and high-temperature creep strength.

 

Are Inox 310 and 310S the same material?

Not entirely. In most European, Japanese, and Chinese contexts, "Inox 310" defaults to 310S (the low-carbon version, C ≤ 0.08%). However, under the US ASTM standard, "310" refers to the higher-carbon version (C ≤ 0.25%), whereas "310S" specifically denotes the low-carbon variant. Therefore, the maximum carbon limit must be explicitly specified during procurement.

 

What Is Inox 310 Equivalent To?

For Inox 310S, the corresponding designations are AISI 310S / UNS S31008 / EN 1.4845 / X8CrNi25-21 / JIS SUS310S. The 310S grade is a lower-carbon variant and is widely used where welding and high-temperature oxidation resistance are required.

Standard System	Inox 310	Inox 310S
AISI / ASTM	310	310S
UNS	S31000	S31008
EN / Werkstoff No.	1.4841	1.4845
EN Grade	X15CrNiSi25-21	X8CrNi25-21
JIS	SUS310	SUS310S
GB	High-Cr-Ni heat-resistant grades	06Cr25Ni20

 

	310 (S31000)	310S (S31008)	310H (S31009)
Carbon (C), max.	0.25%	0.08%	0.04–0.10%
Chromium (Cr)	24.0–26.0%	24.0–26.0%	24.0–26.0%
Nickel (Ni)	19.0–22.0%	19.0–22.0%	19.0–22.0%
Manganese (Mn), max.	2.00%	2.00%	0.75% (1.00% recommended)
Tensile Strength (min.)	515 MPa	515 MPa	515 MPa
Yield Strength (min.)	205 MPa	205 MPa	205 MPa
Elongation	≥ 40%	≥ 40%	≥ 40%
Hardness (HRB max.)	95	95	95
Continuous Service Temperature	1035°C	1150°C	1095°C
Intermittent Service Temperature	1150°C	1150°C	1150°C
Main Applications	Furnace tubes and heat-treatment equipment (non-welded)	Heat-exchanger tubes and welded structures	Critical high-temperature creep components, such as pyrolysis furnace tubes

 

Can 310S be used as a substitute for 310?

For welded structural components, 310S is a perfectly suitable and indeed superior substitute for 310 (as it eliminates the need for post-weld annealing). In non-welded applications where high-temperature strength is the primary requirement (such as furnace radiant tubes), 310 (the high-carbon variant) offers slightly better high-temperature creep strength; however, the difference is less than 5%, making 310S sufficient for most projects.

 

What is the key difference between 310H and 310S?

For 310H, the maximum manganese (Mn) content is reduced to 0.75% (compared to 2.0% for 310S), and the carbon content is controlled within the 0.04–0.10% range. The lower Mn content enhances high-temperature creep strength by approximately 10–15%, making it specifically suited for creep-critical applications such as petrochemical cracking furnace tubes. 310H is listed only in ASTM standards; there are no corresponding grades in EN or JIS standards.

 

What is the maximum service temperature for 310S?

It is suitable for continuous service at 1150°C (2100°F) and intermittent service up to 1150°C. Beyond this temperature, the oxidation resistance and strength of 310S decline sharply; materials such as Inconel 600 or other nickel-based alloys with higher performance capabilities should be considered.

 

310S Stainless Steel Supplier

GNEE supplies 310S stainless steel pipes, tubes, plates, coils, bars and fittings for high-temperature applications, with UNS S31008 / EN 1.4845 / X8CrNi25-21 grades available. For ASTM A312 TP310S pipe, GNEE can supply seamless and welded products covering approximately OD 6–914.4 mm and wall thickness 0.3–50 mm, with 2B/BA, pickled or polished finishes depending on the product.

Product Form	Specification Range	Manufacturing Process
310/310S Seamless Pipe	OD 6 mm – 610 mm, WT 0.5 mm – 50 mm	Hot-rolled piercing / Cold rolling / Cold drawing
310/310S Welded Pipe	1/2" NB – 16" NB (ERW); 6" – 100" NB (EFW)	ERW / EFW / Automatic Welding
310/310S Heat Exchanger Tubes	OD 6–48 mm, WT 0.5–4 mm	Cold drawing + Solution Annealing
310/310S Plate / Strip	Thickness 0.5–200 mm, Width ≤ 3,500 mm	Hot Rolling / Cold Rolling
310/310S Bar	Φ 10–500 mm	Hot Rolling / Forging
310/310S Pipe Fittings	Elbows, Tees, Reducers (ASTM A403)	Hot Forming / Butt Welding

Surface Treatment Options

BA (Bright Annealed)

2B (Cold Rolled, Pickled and Passivated)

No.1 (Hot Rolled and Pickled)

Polished Finish (No.4 / HL / 8K)

Pickling + Passivation

Certifications and Quality Inspection

EN 10204 3.1 Material Test Certificate (MTC), including heat number and actual measured carbon content

Ultrasonic Testing (UT) / Eddy Current Testing (ET)

Full traceability of the solution annealing + pickling process

Delivery time

Parameter	Range / Options
Length	6 m / 12 m / Custom Cut Length
Ends	Plain End / Beveled End / Beveled + Chamfered
Packaging	Wooden Cases / Steel Strapping + Moisture-Proof Paper
MOQ	Typically 5 tons for seamless pipe / 3 tons for welded pipe
Lead Time	Stock items: 7–15 days; Custom orders: 25–40 days

If you are currently selecting materials or working on a design, please let me know:
• The specific operating temperature and environmental conditions (e.g., presence of sulfur, acids, or alkalis)
• The required product form (e.g., seamless pipe, steel plate, or bar stock)
I can evaluate whether 310S is suitable or recommend a more cost-effective alternative grade.

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