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Help CenterSteel Pipe & Tube & Alloy Steel Pipe，12Cr1MoVG、15CrMoG、SA335 P22/P91、1Cr5Mo、15CrMo、42CrMo、20CrMo
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1. Product Overview
Alloy steel pipes are seamless pressure-bearing pipes manufactured by smelting iron-carbon base with alloy elements including chromium, molybdenum, vanadium and nickel. Different from ordinary carbon steel pipes, the alloy composition endows them with comprehensive properties such as high temperature resistance, high pressure resistance, creep resistance, acid & alkali corrosion resistance and high low-temperature toughness. Widely applied in harsh working conditions including power boilers, petrochemical industry, coal chemical industry, oil & gas transportation, mechanical structures and nuclear power. All pipes are produced by seamless forming process without weld seams, featuring higher safety factor under pressure.
Functions of Core Alloy Elements
Chromium (Cr): Improve high-temperature oxidation resistance, sulfide corrosion resistance and hardenability, and resist high-temperature oxidation peeling.
Molybdenum (Mo): Enhance high-temperature strength and creep resistance, and boost long-term strength under high pressure.
Vanadium (V): Refine steel grain structure, improve toughness and fatigue strength, and reduce high-temperature embrittlement.
Nickel (Ni): Optimize low-temperature impact toughness, suitable for medium transportation under sub-zero temperature.
2. Product Classification
2.1 By Forming Process
Hot Rolled Seamless Alloy Steel PipeSuitable for large outer diameter and heavy wall thickness specifications, outer diameter ranging from 168mm to 1200mm, wall thickness 6mm–100mm. Featuring high production efficiency and strong pressure resistance, mainly used for boiler main steam pipelines and high-pressure reactor pipelines in chemical industry.
Cold Drawn / Cold Rolled Precision Alloy PipeSmall-diameter thin-wall precision pipes with outer diameter 6mm–168mm and wall thickness 0.5mm–6mm. Ultra-tight dimensional tolerance and smooth inner wall, applied to instrument pipelines, hydraulic pipelines and heat exchanger tubes.
Hot Extruded Alloy PipeSpecial process for extra heavy-wall and high-alloy hard-to-deform materials, specially used for high-chromium molybdenum heat-resistant steel such as P91 and P92 for supercritical power station pipelines.
2.2 By Application
High Temperature & High Pressure Boiler Alloy PipeGrades: 12Cr1MoVG, 15CrMoG, SA335 P22 / P91. Used for water wall, superheater, reheater and main steam pipelines of power plants, operating stably above 500℃ for long term.
Special Alloy Pipe for Petroleum Cracking & Chemical IndustryGrades: 1Cr5Mo, 15CrMo. Suitable for hydrogenation units, cracking furnaces and sulfur-containing corrosive oil & gas medium with excellent high-temperature sulfidation resistance.
Fluid Transportation Alloy PipeCompliant with GB/T8163 standard, applied to high-pressure medium transportation in oil & gas and coal chemical industry, resistant to pressure and HIC hydrogen induced cracking.
Mechanical Structural Alloy PipeGrades: 42CrMo, 20CrMo. Used for construction machinery, equipment supports, hydraulic cylinder barrels and heavy-duty mechanical structural parts.
High Pressure Alloy Pipe for Chemical Fertilizer IndustryCompliant with GB6479 standard, applied to high-pressure equipment pipelines for synthetic ammonia and urea with resistance to hydrogen-nitrogen corrosion.
3. Main Material Grades (GB vs ASTM Cross Reference)
3.1 Cr-Mo Heat-resistant Boiler Series (Core Material for Power Plants)
15CrMoG (Equivalent to ASTM A335 P12 / T12): Medium temperature high-pressure boiler and header pipeline, maximum service temperature ≤550℃
12Cr1MoVG (Equivalent to A335 P22 / T22): Superheater and reheater of high-pressure power stations, outstanding long-term strength at 580℃
1Cr5Mo (A335 P5 / T5): Refining cracking furnace and high-temperature sulfur-containing medium
P91 (10Cr9Mo1VNb), P92: Supercritical & ultra-supercritical generator units, service under ultra-high temperature up to 620℃
3.2 Mechanical Structural Alloy Series
20CrMo, 30CrMo, 35CrMo, 42CrMo: Construction machinery, hydraulic cylinders, shaft sleeves and heavy structural components
3.3 Low Temperature & Corrosion Resistant Alloy Series
16MnDG, A333 Gr6: Low-temperature oil & gas transportation, excellent impact toughness at -45℃
4. Applicable Standards (Domestic & International)
National GB Standards
GB5310-2008 Seamless Alloy Steel Tubes for High Pressure Boilers
GB9948-2013 Seamless Steel Tubes for Petroleum Cracking
GB6479-2013 High Pressure Seamless Steel Tubes for Chemical Fertilizer Equipment
GB/T8163-2018 Seamless Steel Tubes for Liquid Service
GB/T8162-2018 Seamless Steel Tubes for Structural Purposes
International ASTM / ASME Standards
ASTM A335 / SA335: Seamless Ferritic Alloy-Steel Pipe for High Temperature Service (P5/P12/P22/P91)
ASTM A213 / SA213: Seamless Alloy Steel Boiler, Superheater and Heat Exchanger Tubes (T5/T12/T22/T91)
API 5L: Line Pipe for Oil & Gas Transportation (Alloy Grade X42-X80)
European & German Standards
EN10216-2, DIN17175 Seamless Pressure Steel Tubes for High Temperature Service
5. Complete Specification Parameters
Outer Diameter (OD): 6mm–1200mm, customized extra large diameter available
Wall Thickness (WT): 0.5mm–100mm; thin wall 0.5–5mm, heavy wall ≥6mm
Standard Fixed Length: 6m, 9m, 12m; non-standard cutting length available on demand
Dimensional Tolerance
Outer Diameter: Hot rolled ±0.8%, cold drawn precision ±0.3%
Wall Thickness: ±10%, high-pressure inspection pipes strictly controlled at ±7%
Length: ±5mm
Standard Delivery Length: Mainly 12m per piece, shipped from Tianjin Port, delivery lead time 5–7 days for stock goods
6. Production Process Flow
Refined round billet smelting → Surface flaw detection & grinding → High temperature heating → Piercing forming → Pipe rolling / cold drawing sizing → Heat treatment (Normalizing + Tempering / Quenching & Tempering) → Straightening → Cutting & Chamfering → Hydrostatic Test → Non-destructive Testing (UT Ultrasonic + MT Magnetic Particle Inspection) → Shot blasting / Pickling for rust removal → Logo marking & painting → Bundling & Warehousing
Delivery Heat Treatment Status (Core Process)
All alloy pipes are delivered after complete heat treatment to eliminate internal rolling stress and stabilize mechanical properties:
15CrMo / 12Cr1MoVG: Normalizing at 930–960℃ + Tempering at 680–720℃
P91 / P92: Normalizing at 1040℃ + High temperature tempering at 760℃
Structural 42CrMo: Quenching & high temperature tempering for high strength and toughness
7. Performance Indicators
Mechanical PropertiesTensile strength ≥415–620MPa, Yield strength ≥205–415MPa, Elongation after fracture ≥20%. Qualified room & low temperature impact energy, excellent fatigue and creep resistance.
Pressure Bearing CapacityEvery single pipe undergoes hydrostatic test with 1.5 times standard design pressure, holding pressure without leakage. 100% full-wall ultrasonic inspection for high-pressure pipes to eliminate defects including lamination, crack and inclusion.
Corrosion ResistanceCr-Mo series pipes resist high-temperature oxidation, hydrogen sulfide and weak acid & alkali medium. Low-temperature alloy pipes avoid brittle fracture under extreme cold for oil & gas exploitation in frigid zones.
8. Surface Treatment & Packing
Surface Treatment
Hot rolled pipe: Shot blasting to remove oxide scale, coated with black anti-rust paint
Cold drawn precision pipe: Pickled bright surface, both ends equipped with plastic protective caps
Export dedicated: Overall anti-rust oil coating, pipe body printed with steel grade, standard, dimension, heat number and inspection mark
Packing MethodBundled with steel strips, product certificate attached to each bundle. Wooden pallet packaging for export, covered with moisture-proof stretch film, suitable for sea container loading.
9. Full Factory Inspection Items
Spectroscopic chemical analysis (material re-inspection per heat batch)
Tensile test, hardness test and impact test at room temperature
Hydrostatic tightness test for every single pipe
100% UT ultrasonic wall thickness inspection
MT magnetic particle inspection for surface cracks
Full inspection of dimension, wall thickness and straightness
Sampling high-temperature creep rupture test (special for power station pipelines)
Original inspection certificate complying with EN10204 3.2 standard
10. Main Application Industries
Thermal & Nuclear Power Generation: Boiler water wall, superheater, reheater, main steam pipeline and header (12Cr1MoVG, P91)
Petroleum Refining: Hydrogenation unit, cracking furnace and oil & gas gathering pipeline (1Cr5Mo, 15CrMo)
Coal Chemical & Chemical Fertilizer Industry: High-pressure reaction pipelines for synthetic ammonia, urea and coal gasification units
Long-distance Oil & Gas Transportation: Low-temperature alloy pipeline and anti-corrosion gathering pipeline
Machinery Manufacturing: Hydraulic cylinders, construction machinery booms and heavy-duty equipment structural parts (42CrMo)
Heat Exchange Equipment: Shell & tube heat exchanger and waste heat recovery heat exchange tubes
New Energy Industry: Biomass boilers and solar thermal high-temperature heat exchange pipelines
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