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    Boiler tubes

    Boiler tubes are used in heat exchange appliances in which the energy is transferred from one medium to the other.


    Sunny Steel has an extensive range of boiler and stay tubes available to meet your boiler tube requirements no matter how demanding.

    Boiler tube is installed inside boiler to heat water in order to generate steam, boiler is a closed pressure vessel designed in varieties of types, water tube boiler and fire tube boiler are main types.

    Boiler Tube Standard Specifications

    ASTM A213 for seamless tube and A249 for welded tube are main specifications for stainless steel boiler tubes.

    Tubes are processed by cold drawn, heat treated and pickling finishes, cleaning and smooth surface inside and outside should be made, quality tubes have the capacity of standing in high pressure and high temperature conditions.

    Stainless Steel Grades

    Boiler tube material selection is definitely important, different grades suit to different type of boilers, tubes have to meet complex boiler environments, like Heat Pass location and flow direction, boiler pressure, temperature, steaming rate, and boiler material etc.

    Custom grades:

    • 304
    • 304L
    • 316
    • 316L
    • 321
    • 2205

    Heat resisting grades:

    • 310S
    • 309S
    • 321H
    • 304H

    These stainless steels have high strength and good corrosion resistance in high temperate condition, good properties result from varieties addition of alloy, stainless steel boiler tube can meet high pressure and temperature requirement.

    Sizes And Dimensions Of Boiler Tube

    Facilities & Services

    ASTM A213 T91
    Beveling & Cutting
    SunnySteel can provide OD beveling and cut your boiler tubes to any length.
    Steel pipe hydrostatic testing
    High-pressure boiler tubes are frequently occurs fault...
    Special Packaging
    SunnySteel can supply wood blocking, crating, capping and wrapped ends.

    Boiler tubing is used in these industries

    Sunny steel are instrumental in offering our clients with a wide range of Boiler Tubes that is used in varied industrial applications. We also undertake customization of these tubes to meet the specific requirements of our clients. These Boiler Tubes are known for their resistance to corrosion and tolerance for withstanding temperature variations.

    Boiler tubing is used in these industries:

    • Steam Boilers
    • Power Generation
    • Fossil Fuel Plants
    • Electric Power Plants
    • Industrial Processing Plants
    • Cogeneration Facilities

    Boiler tubes need to withstand high pressure and temperature.

    Overview of standards and types of boiler pipes

    You are looking for boiler pipes with different specifications?

    DIN 17175 EN 10216-2 ASTM A335
    ?St 35.8, I + III? ?P 235 GH, 1 + 2? ?P5?
    ?15 Mo 3? ?16 Mo 3? ?P 11?
    ?13 CrMo 44? ?13 CrMo 4-5? ?P22?
    ?10 CrMo 910? ?10 CrMo 9-10? ?P9?
    ?X 10 CrMo VNb 9-1? ?X 10 CrMo VNb 9-1? ?P91?
    ?X 20 CrMo V 12-1? ?X 20 CrMo V 11-1?

    Carbon steel for water distribution for temperature 0° - 100°C

    EN - DIN? WNr AISI/ Tradename ASTM - UNS Pipe
    P235TR1 ?1.0254 - - A/ SA53B A/ SA53B
    EN10216-1 EN10217-1

    Carbon steel for temperature -20° - 400°C for pressure application

    EN - DIN? WNr AISI/ Tradename ASTM - UNS Pipe
    P235GH ?1.0345 - - A/ SA106 Gr B/ A A/ SA672 B65
    EN10216-2 EN10217-2/ -5
    P265GH 1.0425 - - A/ SA106 Gr C/ A A/ SA672 BB70
    EN10216-2 EN10217-2/ -5
    P355N/ NH 1.0562/ 1.0565 - - API 5L X52 API 5L X52
    EN10216-3 EN10217-3
    P460N/ NH 1.8905/ 1.8935 - - API 5L X65 API 5L X65
    EN10216-3 EN10217-3

    Low Alloy steel and Alloy Steel for temperature 0° to 650°C for pressure application

    EN - DIN? WNr AISI/ Tradename ASTM - UNS Pipe
    16Mo3 1.5415 - - A/ SA335 P1 A/ SA691 1CR
    EN10216-2 EN10217-5
    X11CrMo5-1 1.7362 - - A/ SA335 P5 A/ SA691 5CR
    EN10216-2 EN10217-5
    X11CrMo9-1 1.7386 - - A/ SA335 P9 A/ SA691 9CR
    EN10216-2 EN10217-5
    13CrMo4-5 1.7335 - - A/ SA335 P11 A/ SA691 1 1/4CR
    EN10216-2 EN10217-5
    10CrMo9-10 1.7380 - - A/ SA335 P22 A/ SA691 2 1/4CR
    EN10216-2 EN10217-5
    X10CrMoVNb9-1 1.4903 - - A/ SA335 P91 A/ SA691 91CR
    EN10216-2 EN10217-5
    X10CrWMoVNb9-2 1.4901 - - A/ SA335 P92 A/ SA691 92CR
    EN10216-2 EN10217-5

    Low temperature carbon steel for pressure purpose and low temp up to -50°C

    EN - DIN? WNr AISI/ Tradename ASTM - UNS Pipe
    P215NL 1.0451 - - A/ SA333 Gr1/ Gr6 A/ SA671CC60/70?
    EN10216-4 EN10217-4
    P255QL 1.0452 - - A/ SA333 Gr1/ Gr6 A/ SA671CC60/70?
    EN10216-4 EN10217-4
    P265NL 1.0453? - - A/ SA333 Gr1/ Gr6 A/ SA671CC60/70?
    EN10216-4 EN10217-4
    P355NL1/ NL2 1.0566 - - A/ SA333 Gr6 A/ SA671CC60/70
    A/ SA333 Gr6?
    EN10216-3 EN10217-3

    Low temperature Nickel Steel for pressure purpose and low temp up to -196°C

    EN - DIN? WNr AISI/ Tradename ASTM - UNS Pipe
    X10Ni9/ X8Ni9 1.5682/ 1.5662 - - A/ SA333 Gr. 8 A/ SA671C100/ CH100
    EN10216-4 EN10217-4
    12Ni14 1.5637 - - A/ SA333 Gr3 A/ SA671CF66
    EN10216-4? EN10217-4

    Sunny Steel’s state-of-the-art manufacturing processes and advanced inspection and testing procedures ensure our boiler tube stand up to the harsh environments.

    Sizes And Dimensions Of Boiler Tube

    Outside diameter:

    • 12.7 mm
    • 25.88 mm
    • 19.05 mm
    • 25.4 mm
    • 31.8 mm
    • 38.1 mm

    Wall thickness:

    • 0.71 mm
    • 0.8 mm
    • 1.0 mm
    • 1.2 mm
    • 1.5 mm
    • 1.65 mm
    • 2.11 mm

    Quality Assurance

    We have capability and capacity to ensure boiler tube in superior condition, with advanced inspection and testing procedures, standard tests include dimensional examination, visual checking, chemical composition, mechanical properties as well as non destructive test 100% eddy current test.

    Fire Tube Boiler

    Fire-tube boiler is a type of boiler in which hot gas passes from the fire through one or more pipes that pass through a sealed water container. The heat of the gas is transferred through the wall of the tube through heat conduction, heating the water and eventually generating steam. Fire tube boilers are the third of the four historical types of boilers: low-pressure tank or “haystack” boilers, flue boilers with one or two large flues, fire tube boilers and high-pressure boilers with many small tubes

    Water Tube Boiler

    Water tube boiler is a type of boiler in which water circulates in tubes heated externally by the fire. The fuel is burned in the furnace to produce hot gas, which heats the water in the steam generation tube. In smaller boilers, the additional power generation tubes are separated in the furnace, while larger utility boilers rely on water injection tubes that make up the furnace wall to generate steam. High-pressure water tube boiler: The hot water then rises into the steam drum. Here, saturated steam is drawn away from the top of the drum

    Boiler Tube Failure

    • Creep failures
    • Fatigue
    • Erosion
    • Corrosion, Water side and Fire side

    Boiler Tube Material Grade

    • 304, 304L, 316, 316l, 321, 237, and with suffix “H”.
    • T9, T11, T12, T22, T23 and other alloy steels.

    Boiler tube FAQs

    Boiler tubes are used in fire-tube boiler, a type of boiler in which hot gases from a fire pass through one or more tubes running through a sealed container of water.

    How to get rid of surface stains of cracking tube

    How to get rid of surface stains of cracking tube follow the steps below:

    The first step is to clean, we must first petroleum cracking tube surface oil, dirt, grease, and some other substances removed. The second step is naturally acid, generally speaking, there are two pickling treatment, a chemical treatment, another treatment method is electrolysis, which can be handled in two ways petroleum cracking tube surface cleaning clean, but chemical pickling is a pipeline anti-corrosion measures.

    The third step is necessary to use the tool to the surface of the oil cracking pipe polished, although the effect may not be very good polish, but this procedure is also indispensable. The final step is to make the surface of petroleum cracking tube jet, one can remove some of the dirt, the second is to make the roughness of petroleum cracking tube more evenly.

    For petroleum cracking tube defects formed on the surface there are many, but certainly there are a lot of different reasons, the specific form of the crack is different, often found defective for its appearance on petroleum cracking tube we can see, the main reason for its main form by the following points. In fact, for the production process, the emergence of various drying phenomena of its raw materials for steelmaking summer rainy season or when it will produce up to steel gas content's sake.

    In the process, the ingot when heated due to heating of the air bubbles are burned through, it will have more cracks after the rolling, which will meet the petroleum cracking tube relatively thin, dense and sizes, its length ranging from cracks, these things collectively referred to as hairline, this is a defect. So the cause of the surface oil cracking tube defects are many, so we have to remedy. After oil cracking pipe handling, appearance becomes smoother, more beautiful. Although after the rust will not affect the use again, but if we do the work in advance, so do not bother it. We buy petroleum cracking tube among the first to note that it is not a strong corrosion resistance, have a longer life does not have to select a high-quality petroleum cracking pipe products that can reduce our future work a lot of trouble.

    Small diameter high-pressure boiler tube surface defects that affect the quality, mainly due to waste generation.

    Boiler pipes?often in high temperature and high pressure work, pipe smoke and water at high temperature steam oxidation and corrosion effects will occur, thus requiring durable steel with high strength, high oxidation resistance, and good organizational stability, high pressure boiler tube in addition to chemical composition and mechanical properties, hydrostatic testing done by the root, to be flaring, flattening test. Steel to heat treatment delivery. In addition, the finished steel microstructure, grain size, there are certain requirements decarburization.

    High-pressure boiler tubes are seamless steel pipe categories. Seamless same manufacturing method, but used in the manufacture of steel pipe, there are strict requirements. Often in high-pressure boiler tubes at high temperature and pressure conditions of use, the tube under the effect of high temperature gas and water vapor, oxidation and corrosion will occur. Require durable steel with high strength, high resistance to oxidation corrosion, and have good organizational stability.

    High-pressure boiler tube is mainly used to manufacture high-pressure and high pressure boiler superheater tubes, reheater tubes, windpipe, the main steam pipe. High-pressure boiler tubes for low and medium pressure boiler (working pressure is generally not more than 5.88Mpa, working temperature below 450 ℃) of heating surface tubes; used for high-pressure boilers (above 9.8Mpa working pressure in general, the working temperature of 450 ℃ ~ 650 ℃ between) the heating surface tubes, economizer, superheater, reheater, petrochemical industrial pipe.

    Hardness testing methods of high-pressure boiler tubes

    High pressure boiler tube hardness testing should take into account its mechanical properties, which is related to stainless steel as raw material for the deformation, such as punching, cutting processing performance and quality.

    Therefore, all of the high-pressure boiler tubes need to conduct mechanical tests. Mechanical performance testing method is mainly divided into two kinds, one kind is tensile test, the other kind is usually hardness test.

    Tensile test is the high pressure boiler tube sample, high pressure boiler tube tend to sample to the fracture on tensile testing machine, mechanical properties and determination of one or more, usually only determination of tensile strength, yield strength, break elongation, and reduction of area. Tensile test is the most basic mechanical properties of metallic materials testing methods, almost all of the metal material, as long as the requirements of the mechanical properties of the high pressure boiler tube, the provisions of the tensile test. Especially those appearance and high pressure boiler tube is not good for the material of hardness test, tensile test became the only means of mechanical properties testing.

    Steam boilers

    A steam boiler is a device used to create steam by applying heat energy to water.

    High Frequency Resistance Welding

    A continuous helical fin is attached to the base tube by high frequency electric resistance welding in order to give an efficient and thermally reliable bond. Fins can be either solid or serrated (segmented). The weld produced in this process is a true forge, blacksmith weld. This type of weld is comprised of a fusion between two portions of parent metal without the introduction of a filler material. The weld is simply produced by heating the interfaces to be joined to a plastic state and applying pressure.

    Used in boilers, furnaces and fired heaters for efficient heat recovery.

    High-pressure boiler tubes are frequently occurs fault because of high temperatures, affecting the entire heating system, mainly due to an internal boiler for heat treatment is not perfect, a lot of heat can not be effectively converted and timely treatment.

    High pressure boiler tube hardness testing should take into account its mechanical properties, which is related to stainless steel as raw material for the deformation, such as punching, cutting processing performance and quality.

    Therefore, all of the high-pressure boiler tubes need to conduct mechanical tests. Mechanical performance testing method is mainly divided into two kinds, one kind is tensile test, the other kind is usually hardness test.

    Finned tubes are used in applications involving the transfer of heat from a hot fluid to a colder fluid through a tube wall.

    The rate at which such heat transfer can occur depends on three factors:

    • the temperature difference between the two fluids;
    • the heat transfer coefficient between each of the fluids and the tube wall;
    • and the surface area to which each fluid is exposed.

    Boiler pipe forming include fin tube, serpentine tube and reaming welding.

    Boiler tubes need take for a variety of molding in the boiler manufacture and installation process


    Seamless pipe Specification, standard and identification

    Seamless pipes are extensively applied for the nuclear device, gas, petrochemical, ship building and boiler industries. Seamless pipes dominates 65% of market share in Chinese boiler industry.



    Our team are highly trained and experienced in servicing and producing all types of steel supplies. Whether you've got a large construction project, or need parts for industrial machinery, our team of steel fabrication consultants will ensure that your project is provided with the parts you need, when you need them.

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