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15CrMoG is a chromium-molybdenum (Cr-Mo) alloy steel tube specifically designed for high-temperature and high-pressure applications in power generation, petrochemical, and industrial boiler systems. As a seamless steel tube, it conforms to strict international standards, including GB 5310 (China), ASTM A335 (USA), and EN 10216-2 (Europe), ensuring reliability in critical environments. The "G" in its designation denotes its use in high-pressure boiler systems, highlighting its suitability for transporting superheated steam, hot water, and other high-temperature fluids under extreme conditions.
Pipe types | Outer-caliber（D） | Thickness（S） | ||
Pipe outer-caliber(mm) | Allowable warp(mm) | Pipe thickness(mm) | Allowable warp(mm) | |
Hot-rolled pipes | ＞219～457 | ±1.0％ | ≤20 | －10％，＋12.5％ |
＞20～40 | －10％，＋10％ | |||
＞457～1066 | ±0.9％ | ＞40～70 | －7％，＋9％ | |
＞70～120 | －6％，＋8％ | |||
Standards | Steel pipes No. | Tensile strength（MPa） | Bend strength（MPa） | Elongation（％） | Impact energy（J） | Hardness | |
GB3087 | 10 | 335～475 | ≥195 | ≥24 | / | ||
20 | 410～550 | ≥245 | ≥20 | / | |||
GB5310 | 20G | 410～550 | ≥245 | ≥24 | ≥35 | / | |
20MnG | ≥415 | ≥240 | ≥22 | ≥35 | / | ||
25MnG | ≥485 | ≥275 | ≥20 | ≥35 | / | ||
15CrMoG | 440～640 | ≥235 | ≥21 | ≥35 | / | ||
12Cr2MoG | 450～600 | ≥280 | ≥20 | ≥35 | / | ||
12Cr1MoVG | 470～640 | ≥255 | ≥21 | ≥35 | / | ||
10Cr9Mo1VNb | ≥585 | ≥415 | ≥20 | ≥35 | / | ||
ASME SA106 | SA106B | ≥415 | ≥240 | ≥22 | ≥35 | / | |
SA106C | ≥485 | ≥275 | ≥20 | ≥35 | / | ||
ASME SA333 | SA333Ⅰ级 | ≥380 | ≥205 | ≥28 | －45≥18 | / | |
ASME SA335 | SA335 P11 | ≥415 | ≥205 | ≥22 | ≥35 | ≤163HB | |
SA335 P12 | ≥415 | ≥220 | ≥22 | ≥35 | ≤163HB | ||
SA335 P22 | ≥415 | ≥205 | ≥22 | ≥35 | ≤163HB | ||
SA335 P5 | ≥415 | ≥205 | ≥22 | ≥35 | ≤187HB | ||
SA335 P91 | 585～760 | ≥415 | ≥20 | ≥35 | ≤250HB | ||
SA335 P92 | ≥620 | ≥440 | ≥20 | ≥35 | 250HB | ||
DIN17175 | ST45.8/Ⅲ | 410～530 | ≥255 | ≥21 | ≥27(DVM) | / | |
15Mo3 | 450～600 | ≥270 | ≥22 | ≥34(DVM) | / | ||
13CrMo44 | 440～590 | ≥290 | ≥22 | ≥34(DVM) | / | ||
10CrMo910 | 480～630 | ≥280 | ≥20 | ≥34(DVM) | / | ||
EN10216-2 | 15NiCuMoNb5-6-4 (WB36) | 610～780 | ≥440 | ≥19 | ≥40 | / |
Chemical composition:
Standards | Steel pipes No. | Chemical composition（%） | |||||||||||||
C | Si | Mn | P | S | Cr | Mo | Cu | Ni | V | Al | W | Nb | N | ||
GB3087 | 10 | 0.07～0.13 | 0.17～0.37 | 0.38～0.65 | ≤0.030 | ≤0.030 | 0.3～0.65 | / | ≤0.25 | ≤0.30 | / | / | |||
20 | 0.17～0.23 | 0.17～0.37 | 0.38～0.65 | ≤0.030 | ≤0.030 | 0.3～0.65 | / | ≤0.25 | ≤0.30 | / | / | ||||
GB5310 | 20G | 0.17～0.24 | 0.17～0.37 | 0.35～0.65 | ≤0.030 | ≤0.030 | ≤0.25 | ≤0.15 | ≤0.20 | ≤0.25 | ≤0.08 | ||||
20MnG | 0.17～0.25 | 0.17～0.37 | 0.70～1.00 | ≤0.030 | ≤0.030 | ≤0.25 | ≤0.15 | ≤0.20 | ≤0.25 | ≤0.08 | |||||
25MnG | 0.23～0.27 | 0.17～0.37 | 0.70～1.00 | ≤0.030 | ≤0.030 | ≤0.25 | ≤0.15 | ≤0.20 | ≤0.25 | ≤0.08 | |||||
15CrMo | 0.12～0.18 | 0.17～0.37 | 0.40～0.70 | ≤0.030 | ≤0.030 | 0.80～1.10 | 0.40～0.55 | ≤0.20 | ≤0.30 | ||||||
12Cr2MoG | 0.08～0.15 | ≤0.50 | 0.40～0.70 | ≤0.030 | ≤0.030 | 2.00～2.50 | 0.90～1.20 | ≤0.20 | ≤0.30 | ||||||
12Cr1MoV | 0.08～0.15 | 0.17～0.37 | 0.40～0.70 | ≤0.030 | ≤0.030 | 0.90～1.20 | 0.25～0.35 | ≤0.20 | ≤0.30 | 0.15～0.30 | |||||
10Cr9Mo1VNb | 0.08～0.12 | 0.20～0.50 | 0.30～0.60 | ≤0.020 | ≤0.010 | 8.00～9.50 | 0.85～1.05 | ≤0.20 | ≤0.40 | 0.18～0.25 | ≤0.015 | 0.06～0.10 | 0.03～0.07 | ||
ASME SA106 | SA106B | 0.17～0.25 | ≥0.1 | 0.70～1.00 | ≤0.030 | ≤0.030 | |||||||||
SA106C | 0.23～0.27 | ≥0.1 | 0.70～1.00 | ≤0.030 | ≤0.030 | ||||||||||
ASME SA333 | SA333Ⅰ | 0.09～0.12 | / | 0.7～1.00 | ≤0.020 | ≤0.010 | |||||||||
SA333Ⅵ | 0.09～0.12 | ≥0.1 | 0.9～1.10 | ≤0.020 | ≤0.010 | ||||||||||
ASME SA335 | SA335 P11 | 0.05～0.15 | 0.50～1.0 | 0.30～0.60 | ≤0.030 | ≤0.030 | 1.00～1.50 | 0.50～1.00 | |||||||
SA335 P12 | 0.05～0.15 | ≤0.50 | 0.30～0.61 | ≤0.030 | ≤0.030 | 0.80～1.25 | 0.44～0.65 | ||||||||
SA335 P22 | 0.05～0.15 | ≤0.50 | 0.30～0.60 | ≤0.030 | ≤0.030 | 1.90～2.60 | 0.87～1.13 | ||||||||
SA335 P5 | ≤0.15 | ≤0.50 | 0.30～0.60 | ≤0.030 | ≤0.030 | 4.00/ 6.00 | 0.45/ 0.65 | ||||||||
SA335 P91 | 0.08～0.12 | 0.20～0.50 | 0.30～0.60 | ≤0.020 | ≤0.010 | 8.00～9.50 | 0.85～1.05 | ≤0.40 | 0.18～0.25 | ≤0.015 | 0.06～0.10 | 0.03～0.07 | |||
SA335 P92 | 0.07～0.13 | ≤0.50 | 0.30～0.60 | ≤0.020 | ≤0.010 | 8.50～9.50 | 0.30～0.60 | 0.30～0.60 | ≤0.40 | 0.15～0.25 | ≤0.015 | 1.50～2.00 | 0.04～0.09 | 0.03～0.07 | |
DIN 17175 | ST45.8/Ⅲ | ≤0.21 | 0.10～0.35 | 0.40～1.20 | ≤0.040 | ≤0.040 | ≤0.30 | ||||||||
15Mo3 | 0.12～0.20 | 0.10～0.35 | 0.40～0.80 | ≤0.035 | ≤0.035 | 0.25～0.35 | |||||||||
13CrMo44 | 0.10～0.18 | 0.10～0.35 | 0.40～0.70 | ≤0.035 | ≤0.035 | 0.70～1.10 | 0.45～0.65 | ||||||||
10CrMo910 | 0.08～0.15 | ≤0.50 | 0.30～0.70 | ≤0.025 | ≤0.020 | 2.00～2.50 | 0.90～1.10 | ≤0.30 | ≤0.30 | ≤0.015 | |||||
EN1021 6-2 | 15NiCuMoNb5-6-4 (WB36) | ≤0.17 | 0.25～0.50 | 0.80～1.20 | ≤0.025 | ≤0.020 | ≤0.30 | 0.25～0.50 | 0.50～0.80 | 1.00～1.30 | ≤0.05 | 0.015～0.045 | |||
Chemical Composition and Mechanical Properties
The exceptional performance of 15CrMoG stems from its optimized chemical composition:
Carbon (C): 0.12-0.18% - Provides fundamental strength and hardness.
Chromium (Cr): 0.80-1.10% - Enhances oxidation and corrosion resistance at elevated temperatures.
Molybdenum (Mo): 0.40-0.55% - Improves high-temperature strength and creep resistance.
Other elements like Silicon (Si), Manganese (Mn), Phosphorus (P), and Sulfur (S) are controlled to ensure weldability, toughness, and purity.
This composition grants 15CrMoG excellent mechanical properties:
Tensile Strength: ≥440 MPa
Yield Strength: ≥295 MPa
Elongation: ≥22%
These properties ensure structural integrity under high internal pressures and mechanical loads.
Manufacturing Process
15CrMoG tubes are manufactured using a seamless process, typically hot extrusion or rotary piercing, followed by cold drawing to achieve precise dimensions and superior surface quality. Key steps include:
Smelting: Electric arc furnace refining with secondary refining (e.g., ladle furnace) ensures low impurity levels and homogeneous composition.
Heat Treatment: Normalizing (at ~900-960°C) and tempering (at ~680-730°C) optimize the microstructure, enhancing toughness and stress relief.
Testing: Each batch undergoes rigorous non-destructive testing (ultrasonic, eddy current) and hydrostatic tests to guarantee defect-free performance.
High-Temperature Performance and Microstructure
15CrMoG operates reliably in temperatures up to 550°C, owing to its stable microstructure and alloy design:
Creep Resistance: Molybdenum forms stable carbides, resisting deformation under prolonged stress and high temperatures.
Oxidation Resistance: Chromium forms a protective Cr₂O₃ layer, preventing scaling and degradation in steam environments.
Microstructure: The heat-treated structure consists of fine bainite or ferrite with pearlite, balancing strength and ductility.
Applications
15CrMoG is widely used in:
Superheaters and reheaters in coal-fired and biomass power plants.
High-pressure steam pipelines and headers in industrial boilers.
Heat exchangers and catalyst tubes in petrochemical industries.
Its durability reduces downtime and maintenance costs, making it a preferred choice for critical infrastructure.
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