Chemical Composition Element Content (wt. %) C 0.04–0.10 Si ≤1.00 Mn ≤2.00 P ≤0.045 S ≤0.030 Cr 17.0–19.0 Ni 9.0–13.0 Mo — N — Other Nb+Ta: 8×C–1.00; Fe: Balance

Mechanical Properties Condition Tensile Strength Yield Strength (0.2%) Elongation Hardness Solution annealed ≥515 ≥205 ≥35 ≤217 HB / ≤95 HRB

Refinery piping Petrochemical equipment Power-generation systems High-temperature heat exchangers Steam systems Furnace and thermal-processing equipment

Chemical Composition Element Content (wt. %) C 0.04–0.10 Si ≤1.00 Mn ≤2.00 P ≤0.045 S ≤0.030 Cr 17.0–19.0 Ni 9.0–13.0 Mo — N — Other Nb+Ta: 8×C–1.00; Fe: Balance

Mechanical Properties Condition Tensile Strength Yield Strength (0.2%) Elongation Hardness Solution annealed ≥515 ≥205 ≥35 ≤217 HB / ≤95 HRB

Refinery piping Petrochemical equipment Power-generation systems High-temperature heat exchangers Steam systems Furnace and thermal-processing equipment

347H Stainless Steel Seamless Pipe

Grade: 347H/S34709

Size:

Seamless: 6mm*1mm-720mm*50mm

Coiled: 4mm*0.5mm-32mm*3mm

Standard: ASTM A312, ASTM A213 etc.

Surface: No.1(Pickling), Bright(Polished)

347H Stainless Steel Pipe is a higher-carbon, niobium-stabilized austenitic grade developed for elevated-temperature service. Its stabilization improves resistance to intergranular corrosion after prolonged exposure to high temperatures, while the higher carbon level supports high-temperature strength. 347H pipe is widely used in petrochemical, power-generation, refinery, heat-exchanger, and process piping systems operating at elevated temperatures and under thermal cycling.

Chemical Composition