The core advantage of 253MA pipe lies in its excellent high-temperature oxidation resistance and stable high-temperature mechanical properties. S30815 can be used for a long time under continuous operating conditions of 800-1050℃ and intermittent operating conditions of 1100℃, and can effectively resist the corrosion of media such as high-temperature flue gas, molten salt, and sulfides. HT PIPE is a s30815 Pipe supplier with 15+ export experience. Contact us for more information and quotes for free!
ss EN 1.48280 High-Temperature Mechanical Properties
High-Temperature Tensile Strength: At 800℃, the tensile strength is ≥300MPa, at 1000℃, the tensile strength is ≥150MPa, which is 1.5 times that of 304H stainless steel (tensile strength at 1000℃ ≈100MPa).
High-temperature creep strength: Under conditions of 900℃ and 1000 hours, the creep rupture strength (R₁₀₀₀¹⁰⁰⁰) ≥ 25 MPa, under conditions of 1000℃ and 1000 hours, the creep rupture strength ≥ 10 MPa, meeting the long-term high-temperature load-bearing requirements of industrial furnace radiant tubes and heat exchanger tubes.
High-temperature plasticity: At 800℃, the elongation is ≥ 25%, at 1000℃, the elongation is ≥ 30%, possessing a certain high-temperature forming capability, and can be used to manufacture high-temperature pipe elbows with a bending radius ≥ 3D.
ASTM A312 253MA pipe Processing Performance
Welding Performance: Matching welding wire (e.g., ER308LSi, ER310Si) or welding rod (e.g., E308LSi-16) must be selected. Preheating is not required before welding (when the ambient temperature is ≥0℃). The interpass temperature should be controlled at ≤150℃ to avoid coarse grains in the heat-affected zone.
No heat treatment is required after welding (unless used for applications requiring resistance to intergranular corrosion). The high-temperature tensile strength of the welded joint (≥140MPa at 1000℃) is essentially the same as that of the base material.
Forming Performance: It can be formed using processes such as hot extrusion (heating temperature 1150-1200℃) and cold drawing (suitable for small and medium diameter pipes). After cold working, solution treatment (temperature 1050-1100℃, water quenching) is required to restore plasticity and avoid brittleness caused by work hardening.
Machining Performance: Since the material's hardness is close to that of 304 stainless steel, high-speed steel or carbide tools can be used for cutting. A cutting speed of 80-120 m/min is recommended. Enhanced cooling and lubrication are necessary to reduce tool wear.
Forming Process
Heat the SS253MA steel billet to 1150-1200℃ (holding time depends on the billet diameter, hold for 30 minutes per 100mm of diameter) to achieve full plasticity.
Extrude the heated billet through a die using an extruder to form a hollow tube blank. Control the extrusion speed at 50-80 mm/min to ensure uniform wall thickness (deviation ≤ ±5%).
The pipe blank is sizing (adjusting the outer diameter to the target size using a sizing machine) and straightening (ensuring straightness deviation ≤1mm/m), then cut into fixed-length pipes (standard length 6-12m, custom lengths available upon request).
uns s30815 Pipe Welding
SS253MA hot-rolled steel plate is cut into steel strips, which are then rolled into pipes using a pipe rolling machine. Straight seam welding is performed using TIG welding (tungsten inert gas welding), with pure argon (purity ≥99.99%) as the welding shielding gas to ensure the weld is free of porosity and incomplete penetration.
After welding, the pipe is enlarged overall (the inner diameter is increased to the target size using an enlarging machine) to eliminate welding stress and ensure pipe roundness (roundness deviation ≤1% of nominal diameter).
ss253ma pipe Surface Treatment
Acid Pickling and Passivation: It will used in high-temperature corrosion environments such as industrial furnaces and heat exchangers. This process involves first immersing the pipe in a mixed solution of 10%-15% nitric acid and 2%-5% hydrofluoric acid (40-60℃) for 15-30 minutes to remove surface oxide scale and oil.
Then, immersing in a 5% nitric acid solution (room temperature) for 30 minutes for passivation. In this step it will form a uniform Cr₂O₃ passivation film on the surface that can improve corrosion resistance at room temperature. After treatment, the pipe surface is silvery-white, without yellow or black spots.
Shot Peening: It can be used in applications which requires enhanced surface adhesion. Shot peening is performed using stainless steel shot with a diameter of 0.2-0.5mm to achieve a surface roughness of Ra=2.5-5.0μm, enhancing the adhesion between the coating and the substrate.
Inner wall polishing: In clean and high-temperature environments such as food and pharmaceutical manufacturing, mechanical or electrochemical polishing is performed on the inner wall of the pipe to achieve a surface roughness Ra≤0.8μm, reduce media residue, and meet GMP requirements.
