Key Requirements for Steel Pipes in The Thermal Industry

Requirement Category                          Details

High-Temperature Performance             High creep strength, oxidation resistance, long-term stability

Material Purity                                               Low sulfur and phosphorus, controlled inclusions to prevent brittle fracture

Microstructural Stability                              Uniform grain size, no harmful phase precipitation, resistance to aging

Non-Destructive Testing                             Ultrasonic, eddy current, radiographic inspection; 100% testing for critical parts

Heat Treatment Condition                         Normalizing /tempering or solution treatment to enhance mechanical properties

Dimensional Accuracy                             Uniform wall thickness, tight tolerancece on outer diameter for welding&assembly

Hebei K-Steel pipe Industry can supply all kinds of steel pipe.

GB/T 5310-2023‌ (Seamless Steel Tubes for High-Pressure Boilers in China)

‌Application‌: Critical components in supercritical and ultra-supercritical power plant boilers.

‌Typical Materials‌:

‌20G‌: High-quality carbon steel for medium-pressure boiler heating surfaces

‌12Cr1MoVG‌: Low-alloy heat-resistant steel, resistant up to 580°C, widely used in superheaters and reheaters

‌15CrMoG‌: Cr-Mo steel with excellent resistance to hydrogen corrosion and high-temperature oxidation

‌Requirements‌: Implemented since April 2024, with stricter controls on chemical composition, grain size, decarburization layer, and ultrasonic inspection.

ASTM A213 / ASME SA213‌ (Seamless Ferritic and Austenitic Alloy Steel Tubes for Boilers and Heat Exchangers)

‌Application‌: Superheaters, reheaters, and heat exchangers in power and petrochemical plants.

‌Common Grades‌:

‌TP304/TP316‌: Austenitic stainless steels with high resistance to oxidation and corrosion

‌T22 (P22)‌: 2.25Cr-1Mo steel, heat-resistant up to ~595°C, excellent creep strength

‌T91 (P91)‌: 9Cr-1Mo-V-Nb steel, high strength, used in main steam lines

‌Features‌: High purity, fine grain structure, and full non-destructive testing coverage.

EN 10216-2‌ (European Standard for Non-Alloy and Alloy Seamless Steel Tubes)

‌Application‌: Pressure equipment in European thermal systems.

‌Typical Materials‌:

‌P235GH / P265GH‌: Non-alloy steels for medium- and low-temperature heating surfaces

‌13CrMo4-5 (1.7335)‌: Equivalent to P22, used in high-temperature components

‌Requirements‌: Compliant with PED (Pressure Equipment Directive), must pass hydrostatic, flaring, and flattening tests.

ASTM A106 Gr.B‌ (Carbon-Manganese Seamless Steel Pipe)

‌Application‌: High-temperature fluid transmission in thermal systems

‌Material Properties‌: Carbon <0.30%, Mn 0.29%-1.06%, tensile strength ≥485MPa

‌Advantages‌: Low cost, good weldability, suitable for non-critical high-temperature piping.

‌Heat-Resistant Tubes (e.g., Super304H, HR3C)‌

‌Application‌: High-temperature heating surfaces in ultra-supercritical units

‌Material Characteristics‌:

‌Super304H (18Cr-9Ni-3CuNbN)‌: High-strength austenitic steel for superheater outlet sections

‌HR3C (25Cr-20Ni-NbN)‌: Excellent resistance to flue gas corrosion in extreme environments

‌Requirements‌: Strict heat treatment control to ensure microstructural stability.