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Help CenterSteel Pipe & Tube & High Pressure Boiler Tube，20G、20MnG、25MnG、15CrMoG、12Cr2MoG、12Cr1MoVG、10Cr9Mo1VNbN（T91/P91）、10Cr9MoW2VNbBN（T92/P92）
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1. Product Overview
High pressure boiler tube is special seamless heat-resistant steel pipe complying with GB/T 5310 standard. Manufactured from LF+VD refined steel billets via hot rolling / cold drawing precision forming and dedicated high-temperature heat treatment, seamless structure with uniform wall thickness. Specially applied for high temperature & high pressure heating surfaces and main steam pipelines of power stations & industrial boilers. Long-term service under 450~650℃ and working pressure above 9.8MPa, featuring outstanding high-temperature creep resistance, anti-oxidation and thermal fatigue resistance. It is the core pressure-bearing pipe for supercritical & ultra-supercritical power generating units.
2. Applicable Standards
Domestic Chinese Standards
GB/T 5310-2017 Seamless Steel Tubes for High Pressure Boiler (Main Standard)
GB/T 3087 Seamless Steel Tubes for Low & Medium Pressure Boiler
GB/T 20801 Pressure Piping Code
International Export Standards
ASTM A213 (Heat exchange tube T series), ASTM A335 (High temperature main pipe P series), DIN 17175, EN 10216-2, ASME SA192
Supporting Certifications
SGS material test report, CE pressure vessel certification, full UT/MT NDT report, original Mill Test Certificate (MTC)
3. Main Steel Grades & Service Conditions
3.1 Carbon Heat-Resistant Steel (Medium Temp & Medium Pressure, Cost-Effective)
20G, 20MnG, 25MnGMax long-term wall temperature ≤450℃, for economizer, water wall, medium pressure header
3.2 Cr-Mo Alloy Heat-Resistant Steel (Mainstream for Power Plants)
15CrMoG, 12Cr2MoG, 12Cr1MoVG12Cr1MoVG max service temperature up to 580℃, for superheater, reheater, high temperature header
3.3 Martensitic Heat-Resistant Steel (Supercritical / Ultra-Supercritical Units)
10Cr9Mo1VNbN (T91/P91), 10Cr9MoW2VNbBN (T92/P92)Long-term service at 600~620℃, superior creep strength, dedicated for main steam pipe of 1000MW power units
3.4 Equivalent ASTM Grades
T11/P11, T22/P22, T91/P92, A213 Gr.A1 / Gr.C
4. Complete Production Process
Refined billet spectral re-inspection → Heating at 1100~1280℃ furnace → Piercing & hot rolling forming → Sizing & straightening → Controlled normalizing + tempering heat treatment → Precision cold drawing (thin-wall small tubes) → Shot blasting inner & outer wall derusting → Precise dimension calibration → 100% UT ultrasonic + ET eddy current NDT → Hydrostatic pressure test for each tube → Sampling flattening & flaring + metallographic inspection → Marking & spraying → Anti-rust oil coating → Plastic end caps sealing → Steel strip bundling / wooden pallet warehousing
5. Core Technical Parameters
5.1 Size Range
Outer Diameter (OD): 22mm ~ 1220mm
Wall Thickness (WT): 2.8mm ~ 150mm, customized thin-wall heat exchange tube & heavy-wall main steam tube available
Standard Fixed Length: 6m, 12m; customized length 3~14m, 12m is mainstream for export
End Finish: Plain end, beveled end, precision welding bevel
5.2 High Temperature Mechanical & Pressure Performance
Hydrostatic Test: Holding pressure ≥5s without leakage, pressure calculated by formula P=2SR/D
Stress Rupture Strength: 12Cr1MoVG ≥120MPa at 580℃; T91/P92 excellent creep resistance at 600℃
Yield Strength: 20G≥265MPa; 12Cr1MoVG≥310MPa; P91≥415MPa
Working Pressure Range: 9.8MPa~32MPa, fit for high pressure & supercritical boilers
Metallurgical Requirements: Grain size grade ≥8, maximum decarburized layer ≤0.5mm, free of internal cracks, lamination and inclusions
5.3 Surface & Processing Requirements
Smooth inner & outer wall, free of cracks, peeling, scar, fold and lamination
Residual stress eliminated after heat treatment, excellent weldability without thermal cracking during welding
Resist steam oxidation, hydrogen corrosion and thermal alternating fatigue
6. Core Product Advantages
Stable performance under high temperature & pressure, long service lifeSpecial heat-resistant alloy composition effectively resist creep deformation and oxidation scaling at high temperature, stable service over 15 years for power station boilers.
Full NDT inspection with high safety factor100% dual inspection of ultrasonic & eddy current testing to eliminate tiny internal defects, fully comply with special equipment safety codes for power plant boilers.
Mature heat treatment with uniform metallographic structureControlled quenching & tempering process ensures consistent mechanical performance, no cracking during pipe bending, welding and secondary heat treatment.
Full temperature gradient coverage for all power unit typesComplete grade series from 450℃ medium-pressure to 620℃ ultra-supercritical working conditions to meet different unit selection demands.
Sufficient stock & complete export supporting serviceRegular stock of 20G, 12Cr1MoVG, T91; IPPC fumigated wooden pallet packaging for sea transportation, full documents for smooth customs clearance.
Compliant with special equipment standards for easy acceptanceComplete factory documents including material report, NDT record, hydrostatic test log and metallographic report, one-time acceptance for power plant & chemical projects.
7. Main Application Fields
7.1 Thermal Power Plants (Core Application)
Water wall, economizer, superheater, reheater, header, main steam pipe, reheat pipeline of 300MW/600MW/1000MW subcritical, supercritical & ultra-supercritical boilers
7.2 Industrial High Pressure Boilers
Waste heat boiler, waste incineration boiler, biomass high temperature boiler, high temperature heating surface pipe for chemical self-owned power stations
7.3 Petrochemical High Temperature Equipment
Heat exchange tube for hydrogenation reactor, cracking furnace tube, high temperature & high pressure process pipeline for synthetic ammonia plant
7.4 Metallurgical Thermal System
Steam pipeline of steel mill heating furnace, high temperature heat exchange equipment for waste heat recovery
7.5 New Energy Energy Storage
High temperature heat collection pipe for photothermal power generation, high pressure steam pipeline of energy storage power station
8. Packaging, Shipment & Lead Time
Packaging Methods
Small diameter thin-wall heat exchange tube: Bundled with steel strips, plastic dust-proof caps at both ends, wrapped with anti-rust waterproof film integrally
Medium & large diameter heavy-wall main steam tube: Single pipe wrapped with waterproof woven cloth, sealed pipe ends for protection
Export dedicated: Fixed by IPPC fumigated solid wooden pallets, fit for 40HC high cube container sea shipment
2. Delivery Warehouse: Spot goods shipped directly from Tianjin Port
3. Lead Time: 5-7 days for regular stock goods; 12-20 days for customized orders of special alloy T91/P92 and extra heavy wall thickness
4. Payment Term: 30% TT advance payment, balance settled before shipment, L/C letter of credit is not accepted.
9. Mandatory Full Factory Inspection Items
Spectral chemical composition analysis of raw materials, strictly control harmful impurities S, P, As
Full dimension inspection of outer diameter, wall thickness and length with high precision tolerance per national standard
100% UT ultrasonic flaw detection + ET eddy current surface inspection for each pipe
Hydrostatic tightness pressure test for every single pipe with pressure holding leakage check
Tensile test, normal temperature impact test & high temperature stress rupture mechanical test
Flattening & flaring process performance test
Metallographic structure & decarburized layer depth analysis (mandatory for boiler tubes)
Original Mill Test Certificate, factory certificate and third-party SGS authoritative test report provided
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