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Help CenterSteel Pipe & Tube & High Pressure Boiler Tube，ASME SA-210M, ASME SA-213M, ASTM A335M, EN 10216-2, DIN 17175
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1. Product Overview
High pressure boiler tubes are seamless pressure-bearing steel pipes manufactured in accordance with GB/T 5310-2023. They are specially designed for high-temperature and high-pressure operating conditions with pressure ≥9.8MPa and temperature ranging from 450℃ to 700℃. As core pressure-bearing components of thermal power, cogeneration and petrochemical high-pressure boilers, they endure long-term loads including high-temperature steam erosion, flue gas corrosion and continuous creep stress.
Different from ordinary medium and low pressure boiler tubes (GB 3087), the molten steel for high pressure boiler tubes undergoes LF+VD secondary refining. All products are subject to full-process non-destructive testing, delivering superior high-temperature resistance, creep resistance and stable metallurgical structure.
Core Operating Conditions
Working Pressure: 9.8MPa ~ 30MPa (High-pressure / Subcritical / Supercritical Units)
Working Temperature: 450℃ ~ 700℃
Medium: High-temperature & high-pressure steam, superheated flue gas, high-pressure feedwater
2. Applicable Standards
Domestic Chinese Standards
GB/T 5310-2023 Seamless Steel Tubes for High Pressure Boilers (Latest Current National Standard)GB 3087 Medium and Low Pressure Boiler Tubes (Only for auxiliary pipelines)
International Standards
American Standards: ASME SA-210M, ASME SA-213M, ASTM A335M European Standards: EN 10216-2, DIN 17175
Supply Certifications
Original Mill Test Certificate, NDT Inspection Report, Heat Treatment Record, Third-party Inspection Certificates (SGS & ISO), Export Commodity Inspection Certificate
3. Main Steel Grades, Applicable Temperatures & Application Scenarios
| Steel Grade | Material Category | Long-term Service Temperature | Typical Application Positions |
|---|---|---|---|
| 20G | High-quality Carbon Steel | ≤480℃ | Economizers, Low-temperature Feedwater Pipes, Low-pressure Headers |
| 15CrMoG | Cr-Mo Low-alloy Heat-resistant Steel | ≤540℃ | Superheaters, Reheaters, High-pressure Headers |
| 12Cr1MoVG | Cr-Mo-V Heat-resistant Steel | 540~570℃ | Main Steam Pipes & High-temperature Superheaters of Subcritical Boilers |
| P91/T91 | Martensitic High-alloy Heat-resistant Steel | 580~600℃ | High-temperature Heating Surfaces of Supercritical Units |
| P92/T92 | High Chromium Tungsten Vanadium Heat-resistant Steel | ≤650℃ | Main Steam Pipelines of Ultra-supercritical Boilers |
| 304H/316H | Austenitic Stainless Steel | ≤700℃ | High-temperature Reheaters, Petrochemical High-temperature Heat Exchange Tubes |
4. Production & Manufacturing Process
Billet Smelting: Continuous casting round billets, LF refining + VD vacuum degassing. Strict control of sulfur, phosphorus, hydrogen and oxygen residual impurities to reduce high-temperature embrittlement risks.
Forming Modes
Hot Rolled Tubes: Piercing → Pilger Hot Rolling → Sizing → Straightening. Suitable for large-diameter and heavy-wall tubes with dense and uniform internal structure.
Cold Drawn / Cold Rolled Tubes: Multi-pass precision drawing after annealing hot rolled hollow tubes, featuring higher dimensional accuracy for outer diameter and wall thickness, specially used for thin-wall small-diameter tubes.
Heat Treatment (Core Process): All tubes adopt unified normalizing + tempering quenching and tempering treatment to eliminate rolling stress and stabilize metallographic structure.
20G: Normalizing at 900~930℃ + Tempering at 650~700℃
15CrMoG/12Cr1MoVG: Normalizing at 930~960℃ + Tempering at 680~750℃
P91/P92: Normalizing at 1040℃ + High-temperature Tempering at 760℃
Finishing & Inspection: Cutting pipe ends, hydrostatic test, full-length ultrasonic flaw detection, eddy current testing, full dimensional inspection, spraying marking and anti-rust protection.
5. Product Size Specifications
Outer Diameter (OD): 22mm ~ 1200mm (Custom sizes available on request)
Wall Thickness (WT): 3.0mm ~ 120mm
Standard Fixed Length: 6m, 9m, 12m; Custom random lengths from 3m to 13m & fixed cutting supported
Dimensional Tolerance (GB/T 5310-2023 New Standard)
Hot rolled tube OD tolerance: ±0.8% OD; Wall thickness ±10%
Cold drawn tube OD tolerance: ±0.5% OD; Wall thickness ±8%
Strict control on ovality and straightness, free of flat or bent pipe defects
6. Core Performance Advantages
High Long-term Creep Strength: Resist plastic deformation and tube burst under long-term high-temperature loads, meeting 100,000-hour endurance strength standard for supercritical units.
Excellent Anti-oxidation & Anti-corrosion Performance: Resist high-temperature steam oxidation and flue gas sulfide corrosion, avoiding long-term pipe wall peeling and scaling.
Highly Stable Metallurgical Structure: No pearlite spheroidization or graphitization failure during long-term high-temperature operation, service life over 100,000 hours.
Superior Plasticity & Toughness: Excellent hot/cold bending and welding performance, no cracking during on-site installation.
Reliable Pressure-bearing Safety: Each tube undergoes hydrostatic test under 1.5 times design pressure; automatic ultrasonic flaw detection can capture tiny defects as small as 1.6mm, eliminating hidden risks of internal lamination, cracks and shrinkage cavities.
7. Main Application Fields
Thermal Power Plants: Superheater tubes, reheater tubes, economizers, headers and main steam lead pipes for high-pressure & supercritical boilers.
Cogeneration & Industrial High-pressure Boilers: High-temperature and high-pressure heating surfaces for self-owned boilers in metallurgy, papermaking and chemical industries.
Petrochemical Industry: High-temperature high-pressure heat exchange pipelines and high-pressure reactor feed pipes for hydrogenation units and cracking furnaces.
Nuclear Power Supporting & Thermal Pipe Networks: Main transmission pipelines for high temperature and high pressure medium.
8. Surface Treatment, Packing & Delivery Information
Surface Condition
Hot rolled tubes: Original state with black oxide scale; Sand blasting rust removal available upon request.
Cold drawn precision tubes: Bright annealed surface free of oxide scale.
Pipe ends: Sealed by plastic caps to prevent water ingress and rust during transportation.
Packing Method
Small-diameter tubes: Bundled with steel strips, each bundle attached with material certificate.
Large-diameter heavy-wall tubes: Bundled by 1 or 2 pieces with blue steel wire ropes, pipe ends covered with plastic protective caps.
Export packing: Wrapped with rainproof plastic film and coated with marine anti-rust oil.
Delivery Terms
Production Lead Time: 5-7 working days
Minimum Order Quantity: 5 tons, mixed batches of various specifications & grades acceptable
9. Quality Acceptance Standards
Chemical composition tested furnace by furnace, strict limit on harmful residual elements such as As, Sn and Pb.
Sampling inspection on tensile, impact and high-temperature endurance mechanical properties.
100% hydrostatic test, holding pressure for 5 minutes without leakage.
100% automatic ultrasonic flaw detection, complying with Grade L2 flaw detection standard.
Full visual inspection for each tube: Free of cracks, scratches, scabs, delamination and deep rust pits.
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