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Help CenterSteel Pipe & Tube & Alloy Steel Pipe，15CrMo、12Cr1MoVG、1Cr5Mo、1Cr9Mo、P91、P92、27SiMn、40Cr、42CrMo、20CrMo、20CrMnTi、16MnDG、09MnNiD
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1. Product Overview
Alloy steel pipe is a high-grade seamless pipe manufactured from premium mild carbon steel substrate with precisely added alloy elements including chromium, molybdenum, vanadium, nickel and manganese. Produced through high-temperature hot rolling, cold drawing and precision heat treatment, it features uniform metallographic structure and no welding weak points.
Compared with ordinary carbon steel pipes and galvanized steel pipes, alloy steel pipes possess outstanding comprehensive properties: high temperature resistance, high pressure resistance, creep resistance, low temperature toughness, medium corrosion resistance, high mechanical strength and ultra-long service life. Instead of relying on surface anti-corrosion coating, its superior performance comes from internal alloy metallization. It is a special pressure-bearing pipe specially used for power stations, boilers, petrochemical, coal chemical and high-pressure industrial projects.
2. Product Classification
2.1 Classification by Manufacturing Process
Hot Rolled Seamless Alloy Pipe (Main Industrial Grade): Mainly large diameter and thick wall, with high pressure resistance and excellent overall toughness. Widely applied for boiler main pipelines, high-temperature and high-pressure process pipelines, and petrochemical high-pressure transmission lines.
Cold Drawn Precision Alloy Pipe: Features high dimensional accuracy, uniform wall thickness, smooth inner and outer walls and tiny tolerance. Suitable for mechanical manufacturing, hydraulic cylinders, precision equipment and heat exchanger small-bore tubes.
Hot Expanded Alloy Pipe: Medium and large-diameter thin-wall alloy pipe with high cost performance, commonly used for large-diameter process pipelines and municipal energy transmission projects.
2.2 Classification by Performance & Application Scenarios
Heat-Resistant & High-Pressure Alloy Pipe (Boiler Special): Grades 15CrMo, 12Cr1MoVG, P11, P22. Stable service under 450–580℃ long-term high temperature, excellent high-temperature oxidation and creep resistance. Dedicated for power station superheaters, reheaters and main steam pipelines.
Supercritical High-Alloy Heat-Resistant Pipe: Grades P91, P92, 10Cr9Mo1VNb. Maximum working temperature over 620℃ with ultra-high pressure resistance. Applied for large thermal power plants, supercritical units and high-end energy equipment.
Low-Temperature Weather-Resistant Alloy Pipe: Grades 16MnDG, A333 Gr6. Excellent low-temperature impact toughness, suitable for LNG transmission, low-temperature chemical industry and extreme cold outdoor pipeline projects.
Mechanical Structural Alloy Pipe: Grades 35CrMo, 42CrMo. High strength, wear resistance and fatigue resistance, widely used for mechanical shaft sleeves, hydraulic cylinders and engineering machinery structural parts.
Corrosion-Resistant Alloy Pipe: Cr-Mo alloy system with excellent resistance to hydrogen sulfide and weak acid-base medium, matching refining, chemical cracking and hydrogenation unit pipelines.
3. Common Material Grades & International Standards
3.1 Chinese Standard Grades
15CrMo, 12Cr1MoVG, 35CrMo, 42CrMo, 16MnDG, 10Cr9Mo1VNb, 20CrMo
3.2 American & International Standard Grades
ASTM A335 P11, P22, P91, P92; ASTM A213 T11, T22, T91; ASTM A333 Low Temperature Series; EN 10216, JIS G3458
3.3 Core Executive Standards
GB 5310: Seamless steel tubes for high-pressure boilers (power station high-temperature pipeline)
GB 6479: High-pressure seamless steel tubes for chemical fertilizer equipment (coal chemical & high-pressure medium)
GB 9948: Seamless steel tubes for petroleum cracking (refining & high-temperature cracking)
GB/T 18984: Seamless steel tubes for low-temperature pipeline service (cryogenic engineering)
GB/T 8162: Seamless alloy steel tubes for structural purposes (mechanical & equipment structure)
ASTM A335/A335M: Ferritic alloy seamless pipes for high-temperature service
ASTM A213/A213M: Alloy steel tubes for boilers and heat exchangers
EN 10216-2: Seamless pressure steel tubes for high-temperature service
4. Functions of Core Alloy Elements
Chromium (Cr): Improves high-temperature oxidation resistance, corrosion resistance and sulfur corrosion resistance, enhances structural stability under extreme high temperature.
Molybdenum (Mo): Significantly boosts high-temperature strength and anti-creep performance, prevents pipeline deformation and cracking under long-term high temperature and high pressure.
Vanadium (V): Refines metal grains, improves toughness and fatigue resistance, avoids material aging and failure under long-term high-temperature operation.
Manganese & Silicon: Optimizes rolling forming performance, improves overall structural strength and welding stability.
5. Mechanical & Performance Parameters
Tensile Strength: 415–860MPa (gradually increased according to material grade)
Yield Strength: ≥205–420MPa
Elongation after Fracture: ≥20%, excellent toughness, no brittle fracture risk
Pressure Resistance: 100% hydrostatic test for each pipe, tested under 1.5 times working pressure with no leakage, bulging or permanent deformation
Heat Treatment State: Normalizing & Tempering, Annealing, Quenching & Tempering, stable metallographic structure with no residual rolling stress
Working Temperature: Low-temperature type -45℃～-196℃; Medium-temperature type ≤580℃; High-temperature type up to 620℃+
6. Complete Specification Range
Outer Diameter Range: 6mm–914mm, full-size customized service available
Wall Thickness Range: 1.5mm–120mm, including thin wall, standard wall, thick wall and extra-thick wall
Schedule Series: STD, XS, XXS, SCH40, SCH80, SCH160
Standard Length: 6m, 9m, 12m; Custom length 3–22m available
Pipe End Treatment: Plain End, Beveled End (for welding), Threaded End, Flanged End, Grooved End
7. Production Process Flow
Raw material flaw detection re-inspection → Billet heating → High-temperature piercing → Hot rolling / Cold drawing forming → Sizing & straightening → Precision heat treatment → Inner and outer wall polishing → Non-destructive testing (UT/MT/PT) → Hydrostatic pressure test → Dimensional re-inspection → Logo spraying, packaging & warehousing
Multiple non-destructive detection procedures eliminate internal cracks, interlayers, porosity and wall thickness unevenness, fully meeting international special pressure equipment acceptance standards.
8. Core Product Advantages
Superior High-Temperature & High-Pressure Resistance: Stable under long-term high temperature, high pressure and alternating load, no creep, bulging or cracking compared with ordinary carbon steel pipes.
Highest Safety Performance: Integral seamless structure without welding weak points, effectively avoiding high-pressure leakage and pipe burst risks, suitable for high-risk industrial working conditions.
Excellent Medium Corrosion Resistance: Resists high-temperature oxidation, hydrogen sulfide erosion and weak acid-base corrosion, adapting to complex petrochemical media environments.
Reliable Low-Temperature Performance: Professional low-temperature alloy pipes eliminate low-temperature brittle fracture, applicable for polar and cryogenic projects.
Ultra-Long Service Life: Service life reaches 10–20 years in power and chemical industrial environments, greatly reducing later operation and maintenance costs.
Flexible Processing Performance: Supports cutting, welding, bending, threading and flanging processing with strong on-site construction adaptability.
9. Main Application Fields
Thermal Power Industry: Power station boiler water walls, superheaters, reheaters, main steam pipelines and high-pressure auxiliary pipelines
Petroleum & Coal Chemical Industry: Refining cracking pipelines, hydrogenation units, high-pressure reaction pipelines and oil & gas transmission pipelines
Low-Temperature Energy Engineering: LNG low-temperature pipelines, air separation equipment and polar low-temperature transmission systems
High-Pressure Chemical Equipment: High-pressure fertilizer equipment, pressure vessel piping and high-temperature heat exchange pipelines
Heavy Machinery Industry: Hydraulic cylinders, precision mechanical parts, high-strength structural pipes and transmission shaft sleeves
New Energy & Nuclear Power Supporting: High-temperature and high-pressure auxiliary pipelines and energy equipment pressure-bearing components
10. Unsuitable Application Scenarios
Not applicable for severe corrosion working conditions with strong acid, strong alkali and high chloride ions
Not recommended for ordinary low-pressure water supply, drainage and fire protection pipelines
Not suitable for extreme ultra-high temperature working conditions above 650℃
11. Quality Inspection & Acceptance Standards
100% full inspection of hydrostatic pressure test, appearance and dimension
Ultrasonic & magnetic particle flaw detection to eliminate internal cracks and interlayer defects
Spectral material re-inspection to ensure qualified alloy composition
Complete certification support: Material test report, heat batch certificate, flaw detection report, hydrostatic test report and factory qualification certificate
ISO 9001 certified factory, full quality traceability
12. Product Core Comparison
VS Ordinary Seamless Steel Pipe: Alloy steel pipe has greatly improved high-temperature, high-pressure and anti-corrosion performance for special industrial working conditions; ordinary seamless pipes are only suitable for normal temperature and low-pressure scenarios.
VS Galvanized Steel Pipe: Galvanized pipes rely on surface coating for anti-corrosion and cannot resist high temperature and high pressure; alloy pipes achieve high performance through internal alloy metallurgy, applicable for high-end special industrial working conditions.
13. Export Packaging & Trade Terms
Export Packaging: Standard seaworthy packing with plastic pipe caps, steel strapping and waterproof woven bags, fixed firmly to prevent collision and moisture during long-distance sea transportation
Trade Terms: EXW, FOB, CFR, CIF, DDP
Payment Terms: 30% T/T deposit, 70% balance before shipment; Irrevocable L/C at sight acceptable
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Delivery Time: 5–7 working days
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