15CrMo boiler tubes

High-strength Alloy Tubes For High-pressure Boilers And Petrochemical Applications

15crmo seamless boiler tubes, compliant with gb/t 3077-2015 and gb 5310, are high-strength, low-alloy steel tubes designed for high-pressure boilers, offering excellent thermal strength and oxidation resistance up to 550°c.

15CrMo Seamless Alloy Tube 15CrMo Boiler Tube High-Pressure Seamless Pipe Alloy Steel Boiler Tube +3 More

15CrMo boiler tubes

High-strength Alloy Tubes For High-pressure Boilers And Petrochemical Applications

15CrMo Seamless Alloy Tube 15CrMo Boiler Tube High-Pressure Seamless Pipe Alloy Steel Boiler Tube +3 More

15CrMo seamless boiler tubes, compliant with GB/T 3077-2015 and GB 5310, are low-alloy, high-strength steel tubes designed for high-pressure boilers operating at pressures above 9.8 MPa and temperatures between 450°C and 650°C. These tubes are manufactured through seamless processes (hot-finished or cold-finished), ensuring tight dimensional tolerances and excellent surface finish. The production involves electric furnace smelting, continuous casting, or hot rolling, followed by heat treatments like normalizing, quenching, and tempering to enhance mechanical properties, toughness, and hardenability.

Available in outer diameters from 23 mm to 1500 mm and wall thicknesses from 2.8 mm to 150 mm, 15CrMo boiler tubes are ideal for heating surface tubes, headers, economizers, superheaters, and reheaters in high-pressure boiler systems. The alloy’s composition, including chromium (0.80–1.10%) and molybdenum (0.40–0.55%), provides high thermal strength (≥440 MPa) and oxidation resistance at high temperatures, along with resistance to hydrogen corrosion. Surface treatments like varnishing or galvanizing prevent rust, and rigorous testing (hydrostatic, ultrasonic, and flattening tests) ensures compliance with standards.

Compared to other grades like 12CrMo or ASTM A106, 15CrMo offers superior thermal strength and corrosion resistance at 500–550°C, though its toughness is slightly lower. Its weldability is moderate due to higher alloy content, requiring specific welding materials like E5515-B2 electrodes or H15CrMo welding wire. Post-weld heat treatment is recommended to reduce hardness in weld seams. These tubes are widely used in power generation, petrochemical, and chemical industries for applications like steam pipelines, hydrocracking tubes, and synthetic ammonia production.

15CrMo seamless boiler tubes are a reliable choice for high-pressure, high-temperature environments, offering durability, safety, and cost-effectiveness in demanding industrial applications.

15CrMo boiler tube is based on high-quality carbon structural steel, and one or several alloying elements are appropriately added to improve the mechanical properties, toughness and hardenability of steel. Products made of this type of steel usually require heat treatment (normalizing or quenching and tempering); the parts and components made of such steel usually need to undergo quenching and tempering or surface chemical treatment (carburizing, nitriding, etc.), surface Quenching or high-frequency quenching and other treatments. Therefore, according to the chemical composition (mainly carbon content), heat treatment process and use, this type of steel can be roughly divided into three types: carburizing, quenching and tempering and nitriding. Low-alloy heat-resistant steel is stronger than 12CrMo steel, with slightly lower toughness. It has higher heat resistance and oxidation resistance at 500 - 550 °C or lower, along with good mechanical properties, machinability, and cold strain plasticity. The weldability is fair. It is mainly used for the production of seamless steel pipes and sheets of various calibers.

Key Benefits

High Thermal Strength

Tensile strength of 440–640 MPa at 500–550°C.

Oxidation Resistance

Resists oxidation in high-temperature environments.

Hydrogen Corrosion Resistance

Withstands hydrogen-induced corrosion.

Seamless Design

Uniform structure for high-pressure reliability.

Processability

Moderate weldability with proper heat treatment.

Cost-Effective

Durable design reduces maintenance costs.

15CrMo Boiler Tube Representation Method

The first two digits indicate carbon content in ten‑thousandths. E.g., 40Cr ≈ 0.40 % C.

Elements 12CrMoV). Above that, numbers indicate % content (e.g. 12Cr1MoV means 0.9–1.2 % Cr).

Elements like V, Ti, Al, B, RE are always included in the designation, e.g., 20MnVB (V 0.07–0.12 %, B 0.001–0.005 %).

A trailing “A” denotes high-quality steel versus general grade.

Prefixes/suffixes may indicate application, e.g., ML30CrMnSi for riveting screws.

“Alloy pipe” refers to the material composition, while “seamless pipe” refers to the manufacturing process. They’re distinct: seamless pipes are made without welded joints, and alloy pipes are made from alloyed materials.

Alloy vs Seamless Steel Pipes

🔧 Alloy Steel Pipe

Contains alloying elements (Cr, Mo, Ni, etc.) for high-temperature, high-pressure, and corrosion resistance
Often seamless, divided into structural or high-pressure heat‑resistant types.
Performance exceeds ordinary seamless carbon steel pipes.

🛠 Seamless Steel Pipe

Manufactured without welding—extruded from a solid billet—for uniform structure .
Stronger, more durable, with better pressure and corrosion resistance than welded pipes.
Ideal for demanding oil, gas, chemical, and power applications, though often more expensive .

Comparison of 15CrMo with Other Grades
Feature	15CrMo (GB 5310)	12CrMo (GB 9948)	ASTM A106 Gr. B
Material Type	Low-Alloy Steel	Low-Alloy Steel	Carbon Steel
Temperature Range	450–650°C	Up to 500°C	Up to 400°C
Tensile Strength (MPa)	440–640	410–560	≥415
Yield Strength (MPa)	≥235	≥205	≥240
Corrosion Resistance	High	Moderate	Moderate
Applications	Boilers, superheaters	Petroleum cracking	High-pressure piping
Key Advantage	High thermal strength	Good weldability	Cost-effective

15CrMo Boiler Tube – Naming & Representation

1. Carbon Content: The first two digits represent carbon in ten‑thousandths. E.g., 40Cr ≈ 0.40% carbon
2. Main Alloying Elements: Elements under 1.5% use just the symbol (e.g., Cr). If > 1.5%, numbers follow (e.g., 18Cr2Ni4WA)
3. Microalloying: Minor elements like V, Ti, Al, B, RE must be included. Example: 20MnVB (0.07–0.12% V, 0.001–0.005% B)
4. Quality Indicator: An “A” suffix marks enhanced quality steel vs standard grades
5. Purpose Designation: Special‑purpose steels include role prefixes/suffixes—e.g., ML30CrMnSi for riveting screws
6. Pipe Type Distinction: “Alloy” refers to composition, “seamless” refers to process. They’re independent classifications—e.g., alloy pipe can also be welded, while seamless describes manufacturing

Note: 15CrMo is a low-alloy, heat-resistant steel with superior high-temperature strength (440–640 MPa) and oxidation resistance up to ~550 °C. It often requires normalization or quenching & tempering. Alloy grade 15CrMoG, per GB 5310, offers excellent thermal strength and creep resistance in boilers, headers, superheaters, and steam lines.

Technical Specifications

Chemical Composition of 15CrMo boiler tubes
Element	Composition (%)
Carbon (C)	0.12–0.18
Silicon (Si)	0.17–0.37
Manganese (Mn)	0.40–0.70
Phosphorus (P)	≤0.035
Sulfur (S)	≤0.035
Chromium (Cr)	0.80–1.10
Molybdenum (Mo)	0.40–0.55

Mechanical Properties of 15CrMo boiler tubes
Property	Value
Tensile Strength (MPa)	440–640
Yield Strength (MPa)	≥235
Elongation, min (%)	≥21
Impact Energy (J, -20°C)	≥40
Hardness (HBW, annealed)	≤229

Heat Treatment Process Parameters
Process	Temperature (°C)	Coolant
Hardening	900	Air-cooled
Tempering	650	Air-cooled

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Standards and Specifications

• 15CrMo boiler tube specifications
• GB 5310 15CrMo seamless tube standards
• 15CrMo high-pressure pipe tolerances

Applications

• 15CrMo tubes for high-pressure boilers
• 15CrMo seamless pipes for superheaters
• 15CrMo tubes for petrochemical pipelines

Material and Grades

• 15CrMo alloy steel properties
• 15CrMo high-temperature resistance
• 15CrMo corrosion-resistant alloy

Manufacturing and Testing

• 15CrMo seamless tube manufacturing
• 15CrMo quality testing
• 15CrMo non-destructive testing

Procurement and Suppliers

• 15CrMo boiler tube suppliers
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Dimensions and Customization

• 15CrMo seamless tube dimensions
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Note: 15CrMo seamless boiler tubes comply with GB 5310 and GB/T 3077-2015 standards. For detailed specifications, refer to the standards or contact a certified supplier.

15CrMo seamless boiler tube is a high-strength, low-alloy steel tube compliant with GB 5310 and GB/T 3077-2015, designed for high-pressure boilers and petrochemical applications, offering excellent thermal strength and oxidation resistance up to 550°C.

15CrMo tubes offer tensile strength of 440–640 MPa, yield strength ≥235 MPa, elongation ≥21%, and high resistance to oxidation and hydrogen corrosion at 500–550°C.

Used in high-pressure boilers, superheaters, economizers, petrochemical pipelines, synthetic ammonia production, and turbine blades, resisting high temperatures and corrosive environments.

15CrMo has lower chromium (0.80–1.10%) than 12Cr5MoI (4.00–6.00%), offering better weldability but lower oxidation resistance, making it suitable for slightly lower temperature ranges (450–650°C vs. up to 550°C for 12Cr5MoI).

Produced via hot-finished or cold-finished seamless processes, with heat treatments like normalizing, quenching, and tempering, followed by hydrostatic, ultrasonic, and flattening tests to meet GB 5310 standards.

Industrial Applications

15CrMo seamless boiler tubes are critical for high-pressure boilers, superheaters, and petrochemical systems, offering superior strength and corrosion resistance.

Power Generation

Used in high-pressure steam pipelines and boilers.

Petrochemical Industry

Ideal for hydrocracking and heating furnace tubes.

Chemical Industry

Used in synthetic ammonia and high-sulfur petroleum processing.

Superheaters

Handles high-temperature steam in boiler systems.

Economizers

Enhances efficiency in heat recovery systems.

Turbine Blades

Used in high-temperature turbine components.

15CrMo boiler tubes

15CrMo boiler tubes