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Help CenterSteel Pipe & Tube & High Pressure Boiler Tube，ASTM A213、ASTM A335、ASME SA-192、EN 10216、DIN 17175
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1. Product Overview
High pressure boiler tubes are special seamless steel pipes for core pressure-bearing components of high-pressure, supercritical and ultra-supercritical thermal power generating boilers. They serve under long-term working conditions above 9.8MPa pressure and high-temperature steam of 450℃~650℃. Manufactured by premium carbon boiler steel and Cr-Mo-V heat-resistant alloy with complete quenching & tempering heat treatment, they feature outstanding high-temperature rupture strength, creep resistance, anti-oxidation, steam corrosion resistance and stable metallographic structure. Complying strictly with dedicated national boiler standards and international power piping standards, they act as core pressure-bearing pipes for power station boilers, industrial high-pressure boilers and petrochemical high-temperature heat exchange equipment.
Applicable Standards
Domestic StandardsGB/T 5310-2023 Seamless Steel Tubes for High-Pressure Boilers, GB/T 20409 Multi-Rifled Seamless Steel Tubes for High-Pressure Boilers, GB/T 9948 Seamless Steel Tubes for Petroleum Cracking
International Export StandardsASTM A213, ASTM A335, ASME SA-192, EN 10216, DIN 17175
2. Main Steel Grades & Application Conditions
20G/20MnG: Carbon high-pressure boiler tube, for economizers and low-temperature water walls, long-term service ≤480℃, ≤10MPa
15CrMoG (P12/T12): Cr-Mo heat-resistant alloy, subcritical boiler superheaters and headers, medium-high temperature steam pipelines at 500~560℃
12Cr1MoVG (P22/T22): High Cr-Mo-V alloy, power station main steam pipes and reheaters, stable long-term operation at 550~580℃
P91/T91 (10Cr9Mo1VNbN), P92/T92: 9Cr martensitic heat-resistant steel, supercritical & ultra-supercritical generating units, excellent creep resistance for 600~630℃ ultra-high temperature & pressure conditions
3. Complete Production Process
Refined steel billet incoming flaw detection → Heating in annular furnace → Piercing & hot rolling → Sizing & wall reducing → Controlled cooling → Dedicated heat treatment (Normalizing + High-temperature Tempering) → 100% non-destructive testing → Cold drawing & precision rolling (bright small tubes) → Straightening → Inner & outer wall polishing & cleaning → Cutting & chamfering / multi-rifling forming → Hydrostatic pressure test for every single tube → Flaring, flattening & metallographic re-inspection → Marking & coding → Anti-rust oil coating → Bundling & warehousing
4. Core Specification & Technical Parameters
Outer Diameter Range: 22mm～1220mm
Wall Thickness Range: 2mm～150mm, full thickness per national standard with strictly controlled dimensional tolerance
Standard Fixed Length: 6m/12m, customized non-standard length 3–15m available
Heat Treatment PerformanceAll tubes delivered under heat treatment state with refined uniform grains and eliminated rolling residual stress. Slow strength attenuation under high temperature, no deformation, cracking or creep failure during long-term high-temperature operation, superior impact toughness at both high and low temperatures.
Heat & Pressure Resistance Index
20G/15CrMoG: Max working pressure 16MPa, long-term service temperature ≤560℃
12Cr1MoVG: Long-term working pressure ≤22MPa, applicable temperature within 580℃
P91/P92 supercritical alloy tube: Long-term bearing pressure up to 32MPa, stable service at 600–630℃ ultra-high temperature
Tube Types & End Processing
Plain smooth tube, multi-rifled tube (special for water wall, enhances heat exchange and avoids film boiling)
Pipe ends: Plain end, beveled end for field welding and flange connection
Surface TreatmentHot rolled black finish, cold drawn bright finish, sand blasting rust removal, anti-rust oil sealing; inner wall free of oxide scale, lamination, cracks and pits, smooth fluid passage with low scaling risk.
5. Core Product Advantages
Excellent High-Temperature Creep ResistanceCr, Mo, V, Nb alloy elements refine grains to deliver high long-term rupture strength, preventing creep expansion and tube burst under cyclic long-term high temperature & pressure, greatly extending boiler maintenance intervals.
Anti-Oxidation & Steam Corrosion ResistanceDense protective oxide film forms on pipe wall to resist high-temperature steam oxidation and hydrogen corrosion, service life 3 times longer than ordinary carbon steel pipes.
Strict Full-Set Non-Destructive Inspection100% ultrasonic (UT) & eddy current (ET) testing for every tube, individual hydrostatic burst test, matched flaring & flattening mechanical re-inspection to eliminate internal microcracks and lamination defects, ultra-high safety factor before delivery.
Stable Heat Exchange EfficiencySpecial inner thread structure of multi-rifled tubes breaks steam film, improving heat exchange efficiency by over 40% and reducing boiler energy consumption.
Good Welding & MachinabilitySupport cutting, pipe bending, field welding and heat treatment rework, suitable for prefabrication in boiler factories and on-site installation in power plants.
Sufficient Stock & Stable Delivery CycleFull series of materials and specifications in stock, shipped directly from Tianjin Port, production & delivery cycle 5–7 days. Customized multi-rifling, special wall thickness, extended fixed length and third-party re-inspection available for bulk orders.
6. Main Application Fields
Thermal Power Industry: Supercritical / Subcritical boiler superheaters, reheaters, water walls, economizers, headers, main steam pipelines
Waste-to-Energy & Biomass Power Plants: High-temperature heating surface heat exchange tubes, high-temperature steam transmission pipelines
Petrochemical Industry: Hydrogenation units, cracking furnaces, high-temperature heat exchangers, high-pressure reactor furnace pipelines
Industrial High-Pressure Boilers: Heating surface tubes for self-owned high-pressure boilers in steel, paper and chemical plants
Waste Heat Recovery Equipment: Heat exchange pipelines for high-temperature waste heat boilers and steam generators
Coal Chemical Industry: High-temperature & high-pressure syngas transmission pipelines
7. Factory Inspection & Complete Qualification Documents
Full-item inspection for every single tube per batch, complete export supporting documents attached to shipment:
Dimensional tolerance inspection of appearance, outer diameter, wall thickness and length
Individual hydrostatic pressure test, flaring & flattening test for each tube
100% ultrasonic & eddy current non-destructive flaw detection
Tensile, room/high-temperature impact and hardness mechanical performance test
Metallographic structure & third-party high-temperature creep rupture test (mandatory for power station projects)
Material test certificate, factory certificate, heat number traceability document, SGS/CE export certification report
8. Packaging, Marking & Logistics Delivery
Packaging: Anti-rust oil coated on each tube, plastic protective caps sealed at both ends, bundled with steel strips; thick-wall export tubes can be packed in wooden cases for moisture & rust prevention
Marking: Permanent printing on pipe body including standard number, steel grade, outer diameter × wall thickness, length, heat number and manufacturer information; product certificate label attached to each bundle
Delivery: Direct shipment from warehouse to Tianjin Port, suitable for full container (20GP/40HQ) and LCL export; delivery cycle 5–7 days
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