15CrMoG alloy pipe : High Temperature Alloy Steel For Boiler And Pressure Vessel Use

15CrMoG Seamless Pipe is a high-performance alloy steel pipe designed for superior high-temperature strength, oxidation resistance, and corrosion resistance in demanding applications. Conforming to the Chinese GB/T 5310-2018 standard, this Chrome Moly Pipe contains 0.80-1.10% chromium and 0.40-0.55% molybdenum, making it ideal for boiler pipeline protection in high-pressure boilers, steam pipes, superheaters, and petrochemical piping systems. Its seamless construction ensures exceptional durability and reliability under high-pressure conditions and temperatures up to 550°C.

The 15CrMoG Seamless Pipe is manufactured through hot-rolling, hot extrusion, or cold-drawing processes, followed by heat treatments such as normalizing at 900-960°C and tempering at 680-730°C to optimize mechanical properties. The chromium content enhances oxidation resistance, while molybdenum improves creep resistance and high-temperature strength, making it suitable for boiler pipeline protection in power plants and petrochemical facilities. Available in sizes from 10mm to 1500mm OD, with wall thicknesses from 2.8mm to 150mm, and lengths up to 12.5 meters or customized, it meets diverse project requirements.

The Seamless Alloy Pipes undergo rigorous testing, including flattening, bending, flaring, microstructure examination, and hydrostatic tests, to ensure compliance with GB/T 5310 standards. With a minimum tensile strength of 440-640 MPa and yield strength of 235 MPa, the 15CrMoG pipe offers excellent resistance to thermal stress and pressure, ideal for high-pressure boiler components like headers and superheaters operating at steam parameters of 510°C. Surface treatments such as black varnish, galvanizing, or 3LPE coatings enhance corrosion resistance, while plain or beveled ends facilitate integration into industrial piping systems.

Compared to grades like 12Cr1MoVG or ASTM A335 P11, the 15CrMoG Seamless Pipe offers a balanced combination of high-temperature strength and weldability, though its higher carbon and alloy content (carbon equivalent ~0.45) requires preheating to 200-300°C before welding to prevent cracking. Its pearlite and ferrite microstructure provides high thermal strength at 500-550°C, but prolonged exposure above 550°C may lead to pearlite spheroidization, reducing mechanical properties. This makes it ideal for high- and medium-pressure boiler steam pipes and heat exchanger tubes with wall temperatures up to 550°C.

Engineered to address challenges like pipeline wear, corrosion, and thermal stress, the 15CrMoG Seamless Pipe delivers reliable performance in high-throughput industrial systems. Its advanced alloy composition and seamless construction make it a preferred choice for engineers seeking durable industrial piping solutions for extreme high-temperature environments, ensuring safety, longevity, and efficiency in Chrome Moly Pipe applications.

Key Benefits

High-Temperature Strength

Withstands temperatures up to 550°C for boilers and superheaters.

Corrosion Resistance

Chromium and coatings ensure durability in harsh environments.

Creep Resistance

Molybdenum enhances durability in high-pressure systems.

Seamless Durability

Uniform construction ensures reliability in high-pressure applications.

Cost-Effective

Long lifespan reduces maintenance and replacement costs.

Versatile Applications

Ideal for boilers, petrochemicals, and power plants.

Comparison of 15CrMoG with Other Pipe Grades
Feature	15CrMoG	12Cr1MoVG	ASTM A335 P11
Material Type	Alloy Steel	Alloy Steel	Alloy Steel
Chromium Content	0.80-1.10%	0.90-1.20%	1.00-1.50%
Molybdenum Content	0.40-0.55%	0.25-0.35%	0.44-0.65%
Vanadium Content	None	0.15-0.30%	None
Temperature Range	High (up to 550°C)	High (up to 580°C)	High (up to 550°C)
Corrosion Resistance	Excellent (With coatings)	Excellent (With coatings)	Good (With coatings)
Applications	Boilers, Superheaters, Petrochemical	Boilers, Steam Pipes	Boilers, Refineries
Tensile Strength (MPa)	440-640	490 (min)	415 (min)
Yield Strength (MPa)	235 (min)	245 (min)	205 (min)
Key Advantage	Balanced high-temp strength	Superior thermal strength	Cost-effective high-temp

Chemical Composition of 15CrMoG
Element	Composition (%)
Carbon (C)	0.12-0.18
Silicon (Si)	0.17-0.37
Manganese (Mn)	0.40-0.70
Phosphorus (P)	≤0.025
Sulfur (S)	≤0.025
Chromium (Cr)	0.80-1.10
Molybdenum (Mo)	0.40-0.55

Mechanical Properties of 15CrMoG
Property	Value
Tensile Strength, min (MPa)	440-640
Yield Strength, min (MPa)	235
Elongation, min (%)	21
Hardness, max (HBW)	190

15CrMoG is a chromium‑molybdenum alloy steel grade under GB/T 5310 for high-pressure boilers. It features elevated high-temperature strength and excellent creep resistance, thanks to ~0.8–1.1 % Cr and 0.4–0.55 % Mo

Typical composition: 0.12–0.18 % C, 0.17–0.37 % Si, 0.40–0.70 % Mn, 0.80–1.10 % Cr, 0.40–0.55 % Mo, with S and P ≤ 0.035 %

Tensile strength ranges 440–640 MPa, yield ≥ 235 MPa, elongation ≥ 21%, with good toughness and weldability

Common in high-pressure boilers, superheater and reheater tubes, headers, steam piping, and petrochemical or power generation systems.

Manufactured via hot rolling or cold drawing. Tubes ≤ 30 mm WT are normalized & tempered (900–960 °C normalize, 680–730 °C temper); > 30 mm WT are quenched & tempered or normalized & tempered.

OD: 13.7–660 mm; WT: 2–100 mm. Tube ends can be plain, beveled, or threaded; surfaces often varnished or galvanized.

Offers high creep and oxidation resistance, strong thermal strength up to 500–550 °C, reliable weldability and dimensional precision.

Equivalent standards include ASTM A335 P12, ASME SA213 T12, EN 10216-2 13CrMo4‑5, and JIS G3462 SCM415.

15CrMoG alloy pipe

15CrMoG alloy pipe