What is the difference between 310 and 310S stainless steel pipes?
The primary difference between 310 stainless steel pipe and 310S stainless steel pipe lies in their carbon content: 310S is a low-carbon version (with a carbon content of ≤0.08%) of standard 310 (which has a maximum carbon content of 0.25%). This characteristic allows 310S to exhibit superior welding performance and corrosion resistance, whereas standard 310 offers greater strength in extremely high-temperature environments.
310 vs 310s stainless steel pipe
What is 310 stainless steel pipe?
310 Stainless Steel Pipe is a high-temperature austenitic chromium-nickel stainless steel known for exceptional heat resistance up to 2100°F (1150°C), excellent oxidation resistance, and superior creep strength. Commonly used in furnaces, kilns, and heat exchangers, 310/310S pipes are ideal for harsh environments. Synonyms or related designations include UNS S31000/S31008, AISI 310, and 1.4845.
What is Grade 310S stainless steel pipe?
Grade 310S stainless steel tubing is a low-carbon, high-alloy austenitic stainless steel specifically designed to provide exceptional heat resistance and strength in high-temperature environments (reaching up to 2100°F or 1149°C). It is utilized in various furnaces, kilns, heat exchangers, and petrochemical processing equipment. The letter "S" in its designation signifies that its carbon content is lower than that of the standard Grade 310; this characteristic helps reduce material brittleness and significantly enhances its weldability.
310 vs 310s stainless steel pipe Chemical Composition (wt%)
| Element | 310 (UNS S31000) | 310S (UNS S31008) |
| Carbon (C) | 0.25% Max | 0.08% Max |
| Chromium (Cr) | 24.0 – 26.0% | 24.0 – 26.0% |
| Nickel (Ni) | 19.0 – 22.0% | 19.0 – 22.0% |
| Manganese (Mn) | 2.00% Max | 2.00% Max |
| Silicon (Si) | 1.50% Max | 1.50% Max |
| Phosphorus (P) | 0.045% Max | 0.045% Max |
| Sulfur (S) | 0.030% Max | 0.030% Max |
| Iron (Fe) | Balance | Balance |
310 vs 310s stainless steel Mechanical Properties (At Room Temperature)
| Property | 310 (Typical) | 310S (Typical) |
| Tensile Strength (min) | 515 MPa (75 ksi) | 515 MPa (75 ksi) |
| Yield Strength (0.2% Offset) | 205 MPa (30 ksi) | 205 MPa (30 ksi) |
| Elongation (% in 50mm) | 40% | 40% |
| Hardness (Brinell) | 192 Max | 192 Max |
| Hardness (Rockwell B) | 95 Max | 95 Max |
310 vs 310s stainless steel pipe：Welding and Corrosion
Compared to standard 310 stainless steel (which contains up to 0.25% carbon), 310S stainless steel typically performs more favorably in welding and high-temperature piping applications due to its lower carbon content (maximum 0.08%); this low carbon level helps minimize carbide precipitation, thereby enhancing resistance to intergranular corrosion following welding. In practical manufacturing applications, 310S is often the preferred choice, as it offers superior post-weld corrosion resistance within corrosive, high-temperature environments.
310 vs 310s stainless steel pipe：Temperature Resistance
310S is specifically designed for long-term, continuous high-temperature applications. Its low carbon content effectively prevents carbide precipitation (sensitization) within the 500–800°C temperature range, thereby avoiding intergranular corrosion. 310 (Standard Carbon, C ≤ 0.25%): Possesses higher high-temperature strength; however, its high carbon content renders it susceptible to sensitization when exposed to temperatures between 500°C and 800°C for prolonged periods. Consequently, it is better suited for short-term or intermittent high-temperature operating conditions. Its recommended maximum continuous service temperature is 1035°C (1900°F).
310 vs. 310S Stainless Steel Pipe: Which to Choose?
If your project involves welding, or if the piping will be exposed to a high-temperature environment ranging from 450°C to 850°C for an extended period, 310S is the more prudent choice. However, if the application demands maximum load-bearing strength at extremely high temperatures-and welding is not a primary consideration-then 310 may be considered.
310s ss pipe manufacturers
As a leading Chinese supplier and manufacturer of 310/310S austenitic stainless steel, we maintain a readily available supply of 310S, which typically comes with dual 310/310S certification. We maintain ample inventory to ensure rapid delivery and offer competitive pricing. Whether you require bulk purchases or customized solutions, our 310/310S stainless steel products are designed to meet your specific needs.
Product Forms: 310S stainless steel seamless pipes, 310S stainless steel welded pipes, 310S stainless steel round tubes, etc.
Surface Finishes: No. 1, 2D, 2B, BA, HL, No. 4, Mirror, SB, Embossed, Etched, etc.
To purchase 310S stainless steel products, please contact the supplier, GNEE, to obtain the latest pricing.
