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Help CenterSteel Pipe & Tube & High Pressure Boiler Tube，T11/P11（15CrMo）、T22/P22（12Cr2Mo）、T91/P91、T92/P92
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Steel Pipe & Tube & High Pressure Boiler Tube，T11/P11（15CrMo）、T22/P22（12Cr2Mo）、T91/P91、T92/P92NegotiableMOQ: 5 Metric Tons -
Steel Pipe & Tube & Petroleum Steel Pipe，J55、N80、L80、P110、B、X42、X52、X65、X70、X80NegotiableMOQ: 5 Metric Tons
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Steel Pipe & Tube & Petroleum Steel Pipe，J55、N80、L80、P110、B、X42、X52、X65、X70、X80NegotiableMOQ: 5 Metric Tons
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Steel Pipe & Tube & Petroleum Steel Pipe，J55、N80、L80、P110、B、X42、X52、X65、X70、X80NegotiableMOQ: 5 Metric Tons
High Pressure Boiler Tube - Product Description
High pressure boiler tubes are seamless steel pipes specially used for boilers operating at high pressure and above. Featuring excellent high-temperature resistance, pressure resistance, creep resistance and corrosion resistance, they work continuously under working conditions of 450–650℃ and pressure above 9.8 MPa to convey high-temperature and high-pressure steam. They are key pressure-bearing components for power station boilers, thermal power plants and petrochemical facilities.
1. Applicable Standards
Chinese Standard: GB/T 5310-2023 (current version, replacing GB/T 5310-2017)
American Standard: ASME SA-213, SA-335, SA-106
German Standard: DIN 17175
2. Materials & Main Chemical Compositions
2.1 Common Chinese Standard Grades
20G: High-quality carbon steel, Carbon: 0.17–0.24%. Suitable for working temperature ≤450℃ and medium-high pressure, applied to economizers and low-temperature pipelines.
15CrMoG: Chromium-molybdenum steel, Chromium: 0.8–1.1%, Molybdenum: 0.4–0.55%. Applicable at 500–540℃ and 10–14 MPa, used for superheaters and main steam pipelines.
12Cr1MoVG: Chromium-molybdenum-vanadium steel, Chromium: 0.9–1.2%, Molybdenum: 0.25–0.35%, Vanadium: 0.15–0.3%. Service temperature 540–570℃, pressure 17–20 MPa, the core material for subcritical boilers.
12Cr2MoG: Chromium-molybdenum steel, Chromium: 2.0–2.5%, Molybdenum: 0.9–1.1%. Working temperature 550–580℃, for reheaters and high-temperature headers.
10Cr9Mo1VNb (P91): Ferritic heat-resistant steel, Chromium: 8.0–9.5%, Molybdenum: 0.85–1.05%, containing Vanadium and Niobium. Suitable for 580–600℃, applied to supercritical power generation units.
2.2 Equivalent American Standard Grades
T11/P11 (15CrMo), T22/P22 (12Cr2Mo), T91/P91, T92/P92
3. Dimension Specifications
Outer Diameter: 10–1220 mm (common range: 38–426 mm)
Wall Thickness: 2–120 mm (heavy wall pipe: wall thickness ≥ 10% of outer diameter)
Length: 4–13 m (custom fixed lengths available)
Tolerance: Outer diameter ±0.5–1%, Wall thickness ±10%, Length ±5 mm
4. Production Process
Smelting: Electric furnace smelting with LF/VD refining to ensure high purity and low impurity content.
Rolling: Hot rolling for large-diameter pipes, cold drawing for small-diameter pipes. The finished pipes feature seamless structure and high density.
Heat Treatment:
20G: Normalizing at 900–930℃
15CrMoG / 12Cr1MoVG: Normalizing + Tempering (Normalizing: 950–980℃; Tempering: 720–760℃)
P91: Normalizing + High-temperature tempering (Normalizing: 1040℃; Tempering: 760℃)
5. Room-temperature Mechanical Properties
| Material | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) | Impact Energy (J) |
|---|---|---|---|---|
| 20G | 410–550 | ≥245 | ≥24 | ≥35 |
| 15CrMoG | 440–640 | ≥295 | ≥22 | ≥35 |
| 12Cr1MoVG | 470–640 | ≥255 | ≥21 | ≥35 |
| P91 | ≥585 | ≥415 | ≥20 | ≥41 |
6. Core Performance Requirements
High-temperature Strength: Excellent rupture strength and creep resistance, no deformation under long-term high-temperature service.
Microstructure Stability: No pearlite spheroidization or graphitization during long-term operation.
Corrosion Resistance: Resistant to steam oxidation, flue gas corrosion and stress corrosion.
Processing Performance: Good weldability, cold bending performance and heat treatment performance.
7. Main Applications
Superheater Tubes: Operate at 540–570℃ and 17–20 MPa for high-temperature steam heating.
Reheater Tubes: Secondary heating of steam, working at 500–540℃ and 3–5 MPa.
Main Steam Pipes & Guide Pipes: Transportation of high-temperature and high-pressure steam.
Economizer Tubes: Preheating boiler feed water, service temperature ≤450℃.
Headers & Industrial Pipelines: Widely used in power stations, petrochemical and coal chemical high-pressure piping systems.
8. Appearance & Quality Requirements
No cracks, folds, scars, delaminations or hair lines on inner and outer surfaces.
The depth of removed defects shall not exceed the negative tolerance of wall thickness, and the residual wall thickness shall meet the minimum allowable standard.
Free from excessive scale and rust; pipe ends are flat and perpendicular to the pipe axis.
9. Inspection Items
Dimensional Inspection: Outer diameter, wall thickness, length and ovality.
Non-destructive Testing: Ultrasonic Testing (UT), Eddy Current Testing (ET), Magnetic Particle Testing (MT).
Mechanical Testing: Tensile test, impact test, hardness test, flattening test and bending test.
Hydrostatic Test: Test pressure calculated by formula: 2 × Wall Thickness × Yield Strength / Outer Diameter. Hold pressure for no less than 5 seconds without leakage.
Metallographic Examination: Grain size, microstructure and decarburized layer inspection.
10. Packaging & Marking
Bundled packing with plastic end caps for protection, moisture-proof and rust-proof treatment applied.
Marking: Standard number, material grade, dimension, batch number, heat number and manufacturer.
Mill Test Certificate: Including chemical composition, mechanical properties, heat treatment record and non-destructive testing report.
11. Material Selection Guide
Working temperature ≤450℃, medium-high pressure: Select 20G for cost efficiency.
Working temperature 500–540℃, pressure 10–14 MPa: Select 15CrMoG for stable performance.
Working temperature 540–570℃, pressure 17–20 MPa: Select 12Cr1MoVG, the preferred grade for subcritical boilers.
Working temperature 580–600℃, supercritical working condition: Select P91/P92 with superior high-temperature strength.
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