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Help CenterSteel Pipe & Tube & Alloy Seamless Steel Pipe，15CrMo、12Cr1MoVG、12Cr2Mo1、1Cr5Mo、27SiMn、Q355B、16Mn、X52、X60、X65
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1. Definition & Core Properties
Alloy steel pipe is a special steel pipe manufactured by adding alloy elements including chromium, molybdenum, nickel, vanadium and tungsten into carbon steel base. Customized alloy composition greatly improves its performance of high temperature resistance, high pressure resistance, creep resistance, low temperature toughness and corrosion resistance. Its comprehensive performance far outperforms ordinary carbon steel pipes, widely adopted in harsh industrial environments with high temperature, high pressure and strong corrosive media.
2. Two Main Production Processes
2.1 Seamless Alloy Steel Pipe (Mainstream for Pressure-bearing Projects)
Integrally formed by hot rolling, cold rolling or cold drawing without welding seams, eliminating weak points at weld joints. It owns top performance on high temperature and pressure resistance, mandatory for power station boilers and petrochemical high-pressure pipelines.
Hot rolling: Round billet heating → piercing → pipe rolling → sizing & cooling, suitable for large-diameter thick-wall pipes
Cold drawing / cold rolling: Pickling, precision rolling & annealing, high dimensional accuracy and smooth surface, ideal for thin-wall precision tubes
2.2 Welded Alloy Steel Pipe
Formed by high-frequency welding or submerged arc welding of alloy steel plate/strip. Lower cost than seamless pipes, only applicable for medium-low pressure & normal temperature working conditions. Forbidden for core pipelines of power station main steam and high-pressure boilers.
3. Classification by Total Alloy Content
Low-alloy Pipe (Total alloy elements ≤5%)Grades: 16Mn(Q345B), 42CrMo, 15CrMo. Balanced cost & performance, applied in oil & gas transportation, mechanical structures and medium-temperature heat exchangers.
Medium-alloy Pipe (Total alloy elements: 5%–10%)Cr-Mo heat-resistant steel: 12Cr1MoV, P22, 10Cr9Mo. For boilers operating at 550–580℃ and refinery furnace pipelines.
High-alloy Pipe (Total alloy elements ≥10%)P91/P92, 304/316 stainless steel, Hastelloy alloy, nickel-based alloy. Resist ultra-supercritical temperature above 600℃, strong acid, alkali and seawater corrosion; used in nuclear power, fine chemical and aerospace industries.
4. Common Grades & Matching Service Conditions
Chinese National Standard Grades
15CrMoG: Medium & high-pressure boilers below 540℃, petrochemical cracking tubes
12Cr1MoVG: Superheaters & main steam pipelines of subcritical power plants, long-term service at 570℃
42CrMo: Mechanical structures, hydraulic high-pressure cylinders, engineering machinery sleeves
16Mn(Q345): Oil & gas transmission, steel structure supports, low-temperature pipelines
International ASTM Grades (Widely Used in Foreign Trade)
P11/P22 (T11/T22): High-temperature steam pipelines for conventional power plants
P91 (T91): Supercritical power units, maximum service temperature 620℃
P92 (T92): Main pipes of ultra-supercritical boilers, optimal creep strength
P5/P9: Refinery pipelines resisting high-temperature sulfidation corrosion
5. Key Implementation Standards
Chinese GB Standards
GB/T 8162: Seamless alloy steel pipes for structural purposes
GB/T 8163: Seamless alloy steel pipes for fluid transportation
GB 5310: Seamless alloy steel pipes for high-pressure boilers
GB 6479: High-pressure alloy steel pipes for chemical fertilizer equipment
International Standards
ASTM A335: Seamless ferritic alloy steel pipes for high-temperature service (P series)
ASTM A213: Seamless alloy steel tubes for boilers & heat exchangers (T series)
EN 10216-2: European standard for high-temperature alloy steel pipes
6. Main Advantages
Excellent high temperature & pressure resistance: Stable long-term operation at 450–630℃, anti-deformation under high-temperature creep
High strength & toughness: Tensile strength 30%–50% higher than ordinary carbon steel pipes, strong impact resistance
Wide temperature adaptability: No brittle fracture at low temperature, anti-oxidation & peeling at high temperature
Medium corrosion resistance: Cr-Mo alloy resists sulfidation; nickel-based alloy withstands strong acid & seawater
Long service life with high safety factor under high-pressure working conditions
7. Main Application Fields
Power Industry: Boiler superheaters, reheaters, economizers, main steam pipelines of power stations (P91/P92/12Cr1MoVG)
Petrochemical Industry: Refinery cracking furnaces, high-pressure hydrogenation units, oil & gas gathering pipelines, high-pressure fertilizer equipment
Machinery Manufacturing: Hydraulic cylinders, transmission shafts, high-strength structural parts for construction machinery (42CrMo, 16Mn)
Nuclear Power & New Energy: High-temperature heat exchange, corrosive medium transportation
Aerospace: Precision tubes made of nickel-based superalloy
8. Key Acceptance Points for Procurement
Material certificate: Verify heat number, mechanical property and alloy composition test reports
Non-destructive testing: 100% ultrasonic & eddy current inspection for high-pressure seamless pipes to eliminate cracks and lamination defects
Dimensional tolerance: Strict controllable OD & wall thickness tolerance for cold-drawn precision tubes
Working condition matching: Grade G boiler-dedicated alloy pipes must be adopted for high-temperature boilers; ordinary structural pipes are not allowed for replacement
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