Introduction to 310S austenitic chromium-nickel stainless steel
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Overview: 310S is an austenitic chromium-nickel stainless steel that exhibits excellent oxidation and corrosion resistance. Thanks to its high percentage of chromium and nickel, it possesses much higher creep strength, allowing it to operate at high temperatures; it also has good high-temperature resistance. Use: High-temperature resistant steel pipe made of 310S stainless steel (2520) ； Due to its high contents of nickel (Ni) and chromium (Cr), 310S exhibits excellent resistance to oxidation, corrosion, acidic and saline environments, as well as high temperatures. High-temperature steel pipes made from this material are used in applications such as electric heating elements. By increasing the carbon content in austenitic stainless steels, their strength is enhanced through solid solution strengthening. The chemical composition of austenitic stainless steels features chromium and nickel as the base elements, with additional elements such as molybdenum, tungsten, niobium, and titanium being added. Thanks to their face-centered cubic crystal structure, these materials possess high strength and creep resistance at high temperatures. Chemical composition of 310S stainless steel pipes:C: ≤0.08,
Si: ≤1.00,
Mn: ≤2.00,
P: ≤0.035,
S: ≤0.030,
Ni: ≤19.00–22.00,
Cr: ≤24.00–26.00
Mechanical properties of 310S stainless steel pipes:
Hardness (HB): ≤187
Tensile strength (σb) (Mpa): ≥520
Yield strength (σs) (Mpa): ≥205
Elongation (%) : ≥40
Area reduction (%) : ≥50
Standards applicable to 310S stainless steel pipes: GB/T14975—2002, GB/T14976—2002, GB/T13296—91, GB/T12770—91, GB/T12771—91, GB/T423T-92, GB5310-1995, GB6479-2000, GB9948-1988.
Formulas for calculating the weight of stainless steel pipes:
Density values (g/cm3) for different steel grades and their corresponding calculation formulas:
SUS304: 7.93; W = 0.02491 × t × (D – t) × 1
SUS310S: 7.98; W = 0.02507 × t × (D – t) × 1
SUS409: 7.70; W = 0.02491 × t × (D – t) × 1
Production process for 310S stainless steel seamless pipes:
Industrial pipe production process:
Pipe billet – Inspection – Peeling – Inspection – Heating – Piercing – Acid washing – Trimming – Lubrication and air drying – Welding – Cold drawing – Solution treatment – Acid washing – Passivation – Inspection
Seamless pipe processing process:
Uncoiling – Straightening – End cutting and welding – Looping – Forming – Welding – Removal of internal and external weld beads – Pre-correction – Induction heat treatment – Dimensioning and straightening – Eddy current testing – Cutting – Hydrostatic testing – Acid washing – Final inspection – Packaging
Dimensions and allowable tolerances for 310S stainless steel pipes:
Standardized tolerance levels for outer diameter:
D1: ±1.5%, minimum ±0.75 mm
D2: ±1.0% Minimum ±0.50 mm for D3 ±0.75%. Minimum ±0.30 mm for D4 ±0.50%. Minimum ±0.10 mm