S30815 stainless steel pipe(253MA) is an austenitic, heat-resistant stainless steel specifically designed for high-temperature environments. This material is modified by alloying 21Cr-11Ni stainless steel with rare earth elements and nitrogen, resulting in excellent oxidation resistance and high creep strength in high-temperature environments. HT PIPE is a stainless steel s30815 Pipe supplier with 15+ export experience. Contact us for more information and quotes for free!
253MA High-Temperature Performance
High-Temperature Oxidation Resistance: S30815 stainless steel pipe can be used in air, under non-pressurized conditions, up to 1150°C, exhibiting an extremely low oxidation rate. This is due to the combined action of rare earth elements and silicon, which form a dense, strongly adherent oxide film on the material surface, effectively preventing further oxidation.
High Creep Strength and Durability: S30815 maintains high strength at 900°C, and its short-term tensile strength at all temperatures is over 20% higher than that of conventional stainless steels (such as 304 and 310S). Its exceptional creep deformation resistance and creep rupture strength enable it to maintain structural integrity under long-term high-temperature loads.
Mechanical Properties: 253ma has a minimum tensile strength of 650 MPa and an elongation of 40% in the solution state, demonstrating its combination of high strength and good ductility. This balance of strength and ductility enables the resulting pipe fittings to withstand mechanical and thermal stresses at high temperatures.
Corrosion Resistance: S30815 stainless steel pipe exhibits excellent resistance to high-temperature corrosion and brush corrosion in most gaseous media, including corrosion in chloride-containing environments, which is particularly important for waste incineration and chemical applications.
Alloy s30815 Pipe Chemical Analysis
| % | Cr | Ni | Si | C | Mn | P | S | N | Ce | Fe |
| Min | 20 | 10 | 1.4 | 0.05 | - | - | - | 0.14 | 0.03 | Balance |
| Max | 22 | 12 | 2 | 0.1 | 0.8 | 0.04 | 0.03 | 0.2 | 0.08 | - |
Physical properties of 253MA grade stainless steel Pipe
| Density (kg/m3) | Elastic Modulus (GPa) | Mean Coefficient of Thermal Expansion (mm/m/°C) | Thermal Conductivity (W/m.K) | Specific Heat | Electrical Resistivity (nW.m) | |||
| 0-100°C | 0-600°C | 0-1000°C | at 20°C | at 1000°C | 0-100°C (J/kg.K) | |||
| 7800 | 200 | 17 | 18.5 | 19.5 | 15 | 29 | 500 | 850 |
uns S30815 Mechanical Properties
| Tensile Str (MPa) min | Yield Str 0.2% Proof (MPa) min | Elongation (% in 50mm) min | Hardness | |
| Rockwell B (HR B) max | Brinell (HB) max | |||
| 600 | 310 | 40 | 95 | 217 |
253ma Steel Pipe Manufacturing Process
The manufacturing process for S30815 stainless steel pipe incorporates specialized metallurgical techniques and rigorous quality control. As an electric fusion-welded austenitic stainless steel pipe, its production begins with slab preparation, utilizing patented AOD nitrogen alloying technology to control stainless steel inclusions to ensure precise control of chemical composition. For seamless pipe, the slab is formed through piercing and extrusion.
Welded steel pipe is produced according to ASTM A358/A358M, which specifies welding procedure requirements for different categories:
Class 1: Double-sided welding requires the addition of filler metal throughout the entire weld pass and radiographic inspection.
Class 2: Double-sided welding also requires the addition of filler metal, but radiographic inspection is not required.
Class 3: Single-sided welding requires the addition of filler metal throughout the entire weld pass and radiographic inspection is required.
Classes 4 and 5: Requirements are the same as Class 3, except that filler metal may not be added to the inner pipe surface.
S30815 material key manufacturing steps
Hot Working: Hot forming should uniformly heat the workpiece at 1100°C, and the final forming temperature should be no less than 900°C.
Heat Treatment: Solution treatment is specified at 1050-1150°C for 5-20 minutes, followed by air cooling or water quenching. The typical solution temperature for thick plates is 1070-1100°C.
Welding Process: Suitable for all common welding methods, MIG welding uses spray arc and pulsed arc, using AWS A5.9 S30815 standard welding wire. Preheating and post-weld heat treatment are not required, but the interpass temperature should be maintained low to prevent thermal cracking.
