SS 310S stainless steel is a paramount austenitic stainless steel grade, specifically engineered for high-temperature applications. In India, industries like furnace manufacturing, petrochemicals, cement, and power generation rely heavily on SS 310S for its exceptional performance in extreme thermal environments. Its robust composition resists oxidation and provides excellent mechanical strength even above 1000°C, making it a critical material for boilers, heat exchangers, and industrial furnaces. The 'S' in SS 310S denotes its low-carbon variant, enhancing its weldability and formability compared to its predecessor, 310. For Indian fabricators and procurement engineers, understanding the precise specifications and sourcing options for SS 310S is crucial for ensuring the longevity and efficiency of high-temperature equipment. MetaleMart provides comprehensive details on SS 310S, connecting buyers with reliable Indian manufacturers and suppliers.
Chemical Composition of SS 310S
SS 310S Stainless Steel Chemical Composition
| Element | SS 310S (%) |
| Chromium | 24.0 - 26.0 |
| Nickel | 19.0 - 22.0 |
| Manganese | Max 2.0 |
| Silicon | Max 1.5 |
| Carbon | Max 0.08 |
| Phosphorus | Max 0.045 |
| Sulfur | Max 0.030 |
| Iron | Balance |
Mechanical Properties of SS 310S
SS 310S Stainless Steel Mechanical Properties
| Property | SS 310S (Typical Values) |
| Ultimate Tensile Strength (UTS) | 520 MPa (min) |
| Yield Strength (YS) (0.2% offset) | 205 MPa (min) |
| Elongation at Break | 35% (min) |
| Hardness (Brinell) | 170 (max) |
| Density | 8.0 g/cm³ |
| Modulus of Elasticity | 200 GPa |
SS 310S Stainless Steel Available Forms in India
| Shape | Typical Sizes | Standard Length/Spec |
| Sheet & Plate | 0.5mm - 25mm (thickness), up to 1500mm (width) | 2000mm x 8000mm (IS 5529, ASTM A240) |
| Coil | 0.5mm - 6mm (thickness), up to 1250mm (width) | As per customer requirement |
| Bar & Rod | 5mm - 100mm (diameter) | 3m - 6m (IS 6911, ASTM A276) |
| Pipe & Tube (Seamless/Welded) | SCH 10 to SCH 40, ODs 1/4" to 4" | 6m (IS 1239, ASTM A312) |
| Wire | 0.1mm - 5mm (diameter) | Spools / Cut to length |
SS 310S Stainless Steel Real-world Applications
- Furnace Industry: Used for furnace parts, retorts, muffles, and radiant tubes requiring extreme heat resistance.
- Petrochemical Sector: Essential for components in high-temperature reactors and processing equipment.
- Chemical Processing: Utilized in equipment handling corrosive chemicals at elevated temperatures.
- Power Generation: Applications in boiler tubes, superheaters, and heat exchangers exposed to high thermal stress.
- Food Processing: Suitable for ovens and heating equipment where extreme temperatures are encountered.
- Cement Industry: Components for kilns and coolers demanding superior high-temperature strength.
- Aerospace: Used selectively in exhaust systems and engine components operating at high thermal loads.
- Cryogenic Applications: Exhibits good toughness at very low temperatures, though less common than high-temp use.
SS 310S Stainless Steel Machinability & Weldability
Machining SS 310S requires careful consideration due to its austenitic nature and high-temperature strength. While it offers better machinability than 310 due to its lower carbon content, it
SS 310S Stainless Steel Heat Treatment & Processing
SS 310S stainless steel is primarily used in the annealed condition for its excellent high-temperature properties and ductility. For processing, annealing is the most critical step. The typical annealing temperature range for SS 310S is between 1035°C and 1150°C, followed by rapid quenching in water or air. This process dissolves chromium carbides and ensures a homogenous microstructure, maximizing corrosion resistance and ductility. Hardening is not achievable through heat treatment in the conventional sense for SS 310S; its strength is derived from its composition and work hardening. Normalizing is generally not performed as annealing provides the desired properties. Stress relief annealing can be performed at lower temperatures (e.g., 850-950°C) after extensive cold working or welding to reduce residual stresses, crucial for preventing cracking in high-temperature service. The low carbon content in SS 310S simplifies these heat treatment processes compared to higher carbon grades, ensuring uniform results.
SS 310S Stainless Steel Sourcing in India
SS 310S stainless steel is readily available across major industrial hubs in India, with significant stock often found in Mumbai, Pune, and Chennai. Leading Indian manufacturers like Jindal Stainless, Tata Steel, and SAIL produce various forms of SS 310S. While specific mill production might have higher Minimum Order Quantities (MOQs), typically starting from 1-5 metric tons for plates and coils, smaller distributors and stockists can supply in quantities as low as 50-100 kg, especially for bars and sheets. The price band for SS 310S generally ranges from INR 380 to 550 per kg, varying with form, specific dimensions, and prevailing market conditions for nickel and chromium. Buyers can expect Material Test Certificates (MTC) as per EN 10204 3.1 as standard, with MTC 3.2 available upon specific request and potentially at an additional cost. Positive Material Identification (PMI) is also commonly provided by reputable suppliers to verify the chemical composition of SS 310S.
SS 310S Stainless Steel International Equivalents
| IS | ASTM | EN | JIS | DIN | GOST |
| Fe-25Cr-20Ni SS | S31008 | 1.4845 | SUS310S | X8CrNi25-20 | 12X18H10T (Similar, but with Ti) |
FAQs about SS 310S
What makes SS 310S ideal for high-temperature applications in India?
SS 310S stainless steel excels in high-temperature environments due to its high chromium (24-26%) and nickel (19-22%) content. This composition forms a stable, protective oxide layer that resists scaling and oxidation up to 1035°C in continuous service and 1150°C intermittently. In India, this makes SS 310S indispensable for furnaces, boilers, and petrochemical equipment subjected to extreme heat.
How does the 'S' in SS 310S benefit fabrication in India?
The 'S' in SS 310S signifies a low-carbon variant (max 0.08% C). This lower carbon content significantly reduces the risk of carbide precipitation during welding, making SS 310S more ductile and less prone to sensitization and intergranular corrosion in the heat-affected zone. Indian fabricators benefit from improved weldability and formability, leading to more reliable and easier construction of high-temperature components using SS 310S.
What are the typical MTC and PMI requirements for SS 310S sourced in India?
When sourcing SS 310S in India, buyers typically receive a Material Test Certificate (MTC) as per EN 10204 3.1, detailing the chemical and mechanical properties for the specific batch. Positive Material Identification (PMI) is also commonly requested and provided by reputable suppliers to confirm the alloy's composition matches the SS 310S standard (S31008 / 1.4845) before fabrication.
Can SS 310S be hardened by heat treatment?
No, SS 310S stainless steel cannot be hardened by heat treatment like carbon or martensitic steels. As an austenitic stainless steel, its strength primarily comes from its alloy composition and cold working. Heat treatment, specifically annealing between 1035-1150°C followed by quenching, is performed to improve its ductility and corrosion resistance at high temperatures, not to increase hardness.
What is the price range for SS 310S in India?
The price for SS 310S stainless steel in India typically varies between INR 380 to INR 550 per kilogram. This range depends heavily on the form (sheet, plate, bar, pipe), thickness, specific mill source, current global prices of nickel and chromium, and the quantity ordered. Buyers should also factor in potential costs for specialized testing or MTC requirements for SS 310S.