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Steel Pipe & Tube & High Pressure Boiler Tube，38、42、48、51、57、60、76、89、108、133、159、168、194、219NegotiableMOQ: 5 Metric Tons -
Steel Pipe & Tube & High Pressure Boiler Tube，38、42、48、51、57、60、76、89、108、133、159、168、194、219NegotiableMOQ: 5 Metric Tons
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Steel Pipe & Tube & High Pressure Boiler Tube，38、42、48、51、57、60、76、89、108、133、159、168、194、219NegotiableMOQ: 5 Metric Tons
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Steel Pipe & Tube & High Pressure Boiler Tube，38、42、48、51、57、60、76、89、108、133、159、168、194、219NegotiableMOQ: 5 Metric Tons
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Steel Pipe & Tube & High Pressure Boiler Tube，38、42、48、51、57、60、76、89、108、133、159、168、194、219NegotiableMOQ: 5 Metric Tons
High Pressure Boiler Tube Product Detailed Description
1. Product Overview
High pressure boiler tube is a seamless steel pipe specially used for high-pressure and above parameter boilers, serving as the core pressure-bearing component of power station boilers. It works long-term under the environment of high temperature, high pressure and steam corrosion. It implements the national standard GB/T 5310-2023 (replacing the 2017 version), with working pressure ≥ 9.8MPa and temperature ranging from 450℃ to 650℃. It is applied to superheaters, reheaters, main steam pipelines, headers and other key parts.
2. Implementation Standards
China: GB/T 5310-2023 (Seamless Steel Tubes for High Pressure Boilers)
International: ASTM A335 (P11/P12/P22/P91/P92), EN 10216-2, DIN 17175
3. Main Materials and Chemical Composition (Common Grades)
Classified into four categories: Carbon Steel, Low Alloy Heat Resistant Steel, High Alloy Ferritic Steel and Austenitic Stainless Steel.
| Grade | Material Type | Main Composition (%) | Applicable Temperature/Pressure | Typical Application |
|---|---|---|---|---|
| 20G | Quality Carbon Steel | C:0.17–0.24; Mn:0.35–0.65 | ≤450℃; ≤10MPa | Water wall and low-temperature superheater of medium and high pressure boilers |
| 15CrMoG | Low Alloy Heat Resistant Steel | Cr:0.8–1.2; Mo:0.45–0.65 | ≤540℃; 10–14MPa | Superheater, reheater and steam pipeline of high pressure boilers |
| 12Cr1MoVG | Low Alloy Heat Resistant Steel | Cr:0.9–1.2; Mo:0.25–0.35; V:0.15–0.30 | 540–570℃; 17–20MPa | Core heating surface of ultra-high pressure / subcritical boilers |
| P91 (10Cr9Mo1VNbN) | High Alloy Ferritic Steel | Cr:8.0–9.5; Mo:0.85–1.05; V:0.18–0.25 | 580–600℃; 25–30MPa | Main steam pipeline and reheater of supercritical / ultra-supercritical boilers |
| P92 | High Alloy Ferritic Steel | Cr:8.5–9.5; W:1.5–2.0; V:0.20–0.25 | 600–620℃; ≥30MPa | High temperature section and header of ultra-supercritical boilers |
4. Specification and Dimension (GB/T 5310-2023)
Outer Diameter: 10–762mm (Common sizes: 38, 42, 48, 51, 57, 60, 76, 89, 108, 133, 159, 168, 194, 219, 273mm)
Wall Thickness: 2–120mm (Common sizes: 3–50mm)
Length: Fixed length 6–12m, customized as required
Dimensional Tolerance:
Outer Diameter: ±1% (Minimum ±0.5mm)
Wall Thickness: ±12.5% (Minimum ±0.3mm)
5. Production Process
Continuous Casting Round Billet → Heating → Hot Rolling Piercing → Hollow Pipe → Cold Rolling / Cold Drawing → Heat Treatment (Normalizing + Tempering) → Finishing → Non-destructive Testing → Hydrostatic Test → Marking → Packaging
Heat Treatment: 20G/15CrMoG adopts normalizing and tempering; 12Cr1MoVG adopts normalizing at 980–1020℃ and tempering at 720–760℃; P91/P92 adopts normalizing at 1040–1060℃ and tempering at 750–780℃.
Non-destructive Testing: 100% Ultrasonic Testing (UT) + Eddy Current Testing (ET); X-ray Testing (RT) is added for high alloy pipes.
6. Mechanical Properties (Room Temperature, Typical Value)
| Grade | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) | Impact Energy (J) | Hardness (HB) |
|---|---|---|---|---|---|
| 20G | 410–550 | ≥245 | ≥24 | ≥35 | ≤156 |
| 15CrMoG | 440–640 | ≥295 | ≥22 | ≥35 | ≤170 |
| 12Cr1MoVG | 470–640 | ≥345 | ≥21 | ≥47 | ≤180 |
| P91 | 585–760 | ≥415 | ≥20 | ≥34 | ≤250 |
7. Core Performance Requirements
High Temperature Rupture Strength: Resist creep and deformation for a long time under working temperature.
Oxidation Resistance: Low oxidation rate under high temperature flue gas and steam, forming dense oxide film.
Microstructure Stability: No pearlite spheroidization and carbide aggregation growth under long-term high temperature.
Corrosion Resistance: Resist steam corrosion, coal ash corrosion and stress corrosion cracking.
Process Performance: Excellent weldability, cold bending, flaring and flattening performance.
8. Application Fields
Electric Power (Thermal Power / Cogeneration): Boiler superheater, reheater, main steam pipeline, header, water wall, economizer.
Petrochemical Industry: High temperature and high pressure reactor, heat exchanger, cracking furnace pipe, steam transmission pipeline.
Nuclear Power: Conventional island steam and water system, high temperature and high pressure pipeline.
Industrial Boiler: High pressure steam boiler, waste heat boiler, waste incineration boiler.
9. Quality Inspection
Chemical Composition Analysis: Sampling per heat batch for spectral and chemical analysis.
Mechanical Test: Tensile test, impact test, hardness test, flattening test and flaring test.
Hydrostatic Test: Test pressure = 2 × design pressure (≥10MPa), holding pressure for more than 30 seconds without leakage.
Non-destructive Inspection: 100% full inspection by UT/ET/RT.
Appearance & Dimension: Inspect each pipe for no cracks, folds and scars; dimensional tolerance meets standards.
10. Packaging and Marking
Packaging: Both ends sealed with plastic end caps, coated with anti-rust oil, bundled with woven bags or steel strips (each bundle ≤ 3 tons).
Marking: Spray marks on pipe body including standard number, material, specification, heat batch number, factory logo and production date. Attached with quality certificate covering chemical composition, mechanical properties, flaw detection and hydrostatic test results.
11. Selection Guide
≤450℃: Choose 20G (Economical and good weldability)
450–540℃: Choose 15CrMoG (Mature design and high cost performance)
540–570℃: Choose 12Cr1MoVG (Excellent high temperature strength, mainstream for power stations)
570–600℃: Choose P91 (Standard configuration for supercritical units)
≥600℃: Choose P92 (Ultra-supercritical, excellent high temperature creep resistance)
12. Product Advantages
High Reliability: Strict standards and whole-process quality control, service life ≥ 100,000 hours.
High Temperature & High Pressure Resistance: Adapt to high parameters of modern power stations (25–30MPa, 580–620℃).
Low Energy Consumption: Wall thickness of high alloy pipes can be reduced by 20%, lowering equipment weight and heat loss.
13. Notes
It is forbidden to use GB/T 8163 (Fluid Pipe) to replace high pressure boiler pipe, which has low smelting and flaw detection requirements and great potential safety hazards.
Check material, specification and heat batch number before installation; mixing materials is strictly prohibited.
Matching welding consumables shall be adopted for welding, and post-weld heat treatment is required.
Regularly monitor wall thickness, oxide layer and metallographic structure during operation, and replace aging pipes in time.
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