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Help CenterSteel Pipe & Tube & Alloy Steel Pipe，Φ6mm-Φ630mm，Φ114-Φ273mm，Φ273-Φ630mm
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Alloy Steel Pipe Product Detailed Specification
1. Product Overview
Alloy steel pipe is made of high-quality carbon steel as the base material, with chromium (Cr), molybdenum (Mo), nickel (Ni), manganese (Mn), vanadium (V), titanium (Ti), niobium (Nb) and other alloy elements added proportionally. It is manufactured through strict smelting, rolling and heat treatment processes to form seamless steel pipe.
By solid solution strengthening, dispersion strengthening and grain boundary strengthening of alloy elements, it significantly improves high-temperature strength, creep resistance, corrosion resistance, fatigue resistance and low-temperature toughness. It overcomes the defects of ordinary carbon steel pipe such as easy deformation, corrosion, cracking and insufficient bearing capacity under severe working conditions. It is a special pipe for core working conditions in electric power, petrochemical, energy, machinery, military and other industries.
Adopting seamless manufacturing technology, the pipe has no weld defects, uniform wall thickness, stable pressure bearing and balanced mechanical properties. It can operate stably for a long time under harsh environments such as high temperature, high pressure, acid-base corrosion, oil and gas medium and dust erosion, with far longer service life than ordinary steel pipes and outstanding cost performance.
2. Main Material Classification & Application Scope
2.1 Chromium-Molybdenum Heat-Resistant Alloy Steel Pipe
15CrMoG: Medium temperature heat-resistant alloy pipe with balanced chromium-molybdenum ratio. Long-term service temperature ≤550℃. It features excellent high-temperature oxidation resistance, creep strength and weldability, widely used for medium-pressure boilers, steam pipelines, heat exchangers and heat conduction oil pipelines.
12Cr1MoVG: Special alloy pipe for high-pressure boilers. Vanadium element is added to strengthen grain boundary, with greatly improved high-temperature strength and creep resistance. Long-term service temperature ≤580℃. Mainly applied to high-pressure boiler superheaters, reheaters, main steam pipelines and auxiliary power station pipelines.
10CrMo910 / P91 / P92: Ultra-fine grain heat-resistant alloy steel pipe manufactured by martensitic heat treatment process. Heat-resistant temperature up to 600-650℃, excellent creep and fatigue resistance. Specially used for supercritical and ultra-supercritical power station boilers and high-temperature main steam pipelines.
2.2 Corrosion-Resistant Alloy Steel Pipe
12Cr2Mo1R / HIC: Hydrogen-induced cracking resistant alloy pipe, anti-hydrogen sulfide and hydrogen corrosion. Dedicated to petroleum refining, hydrogenation units and coal chemical industry sulfur-containing medium transportation.
2.3 High-Strength Structural Alloy Steel Pipe
Materials including 42CrMo, 35CrMo, 27SiMn feature ultra-high tensile strength, yield strength and impact toughness. After quenching and tempering, the hardness is uniform, suitable for hydraulic cylinder barrels, mechanical transmission shafts, high-pressure gas cylinders, mining machinery and heavy-duty structural parts.
3. Chemical Composition & Mechanical Properties
3.1 Chemical Composition of Typical Materials (Mass Fraction %)
| Material | C | Si | Mn | Cr | Mo | V | P/S (Max) |
|---|---|---|---|---|---|---|---|
| 15CrMoG | 0.12-0.18 | 0.17-0.37 | 0.40-0.70 | 0.80-1.10 | 0.40-0.55 | - | 0.025/0.025 |
| 12Cr1MoVG | 0.10-0.15 | 0.17-0.37 | 0.40-0.70 | 0.90-1.20 | 0.25-0.35 | 0.15-0.30 | 0.020/0.020 |
3.2 Core Mechanical Performance Indexes
Tensile Strength: 450-780MPa (varies by material), over 30% higher than ordinary carbon steel pipe
Yield Strength: ≥275MPa, excellent deformation resistance under high pressure
Elongation: ≥20%, sufficient toughness, no cracking during cold processing and installation bending
Hardness: HB150-220, balancing strength and machinability
High-Temperature Durability Strength: ≥100MPa at 550℃, no creep deformation under long-term high temperature
Impact Toughness: Normal temperature impact energy ≥35J, stable anti-brittle fracture performance under low temperature
4. Production Process & Quality Assurance
4.1 Standard Production Process
Raw Pipe Billet Selection → Rotary Furnace Heating → Piercing → Hot Rolling / Extrusion Forming → Sizing & Precision Rolling → Online Cooling → Heat Treatment (Normalizing + Tempering / Quenching & Tempering / Solution Treatment) → Straightening → Cutting → Non-Destructive Testing → Hydrostatic Pressure Test → Surface Finishing → Marking → Warehousing
4.2 Process Advantages
Seamless Rolling: Weld-free overall forming, avoiding inherent defects such as air holes, slag inclusion and incomplete penetration of welded pipes
Precise Heat Treatment: Automatic temperature-controlled furnace refines grain and eliminates internal stress, ensuring stable and uniform mechanical properties
High Dimensional Accuracy: Outer diameter tolerance ±0.5mm, wall thickness tolerance ±5%, meeting high-precision assembly requirements
Strict Impurity Control: Strict deoxidation and desulfurization in smelting to improve pipe purity and reduce corrosion and cracking risks
4.3 Full-Range Quality Inspection
Chemical Composition Test: Spectrum direct reading analysis for each furnace batch
Mechanical Performance Test: Tensile, impact, hardness and high-temperature creep tests with official inspection reports
Non-Destructive Testing: UT ultrasonic testing, ET eddy current testing to detect internal cracks, delamination and shrinkage cavity
Hydrostatic Pressure Test: Hydrostatic pressure test for each pipe, pressure holding ≥10 seconds without leakage and deformation
Appearance & Dimension Inspection: Full inspection of surface quality, outer diameter, wall thickness, length and straightness
Traceable Marking: Each pipe is marked with material, specification, standard, heat batch number and production date
5. Product Specification Range (Custom Non-Standard Available)
Outer Diameter: Φ6mm - Φ630mm
Wall Thickness: 1.5mm - 50mm
Length: Fixed length 6m / 9m / 12m; Random length 4m - 12m, customized cutting available
Delivery Condition: Normalized & Tempered, Annealed, Quenched & Tempered, Pickled & Passivated, Black Antirust Paint
6. Application Fields
Power Industry: Thermal power plant high-pressure boiler, superheater, reheater, main steam pipeline; nuclear power conventional island pipeline
Petrochemical Industry: Refinery hydrogenation unit, cracking furnace pipe, oil and gas transmission pipeline, desulfurization and denitrification system
Coal Chemical Industry: Coal gasifier, syngas pipeline, high-pressure reactor supporting pipe
Machinery Manufacturing: Hydraulic cylinder barrel, bearing pipe, transmission shaft, engineering machinery high-pressure oil pipe
Metallurgy & Energy: Thermal oil furnace pipeline, blast furnace cooling pipe, coking plant high-temperature pipeline
Shipbuilding & Military: Marine boiler pipe, ballast water pipeline, special equipment high-temperature and high-pressure parts
Environmental Protection: Sewage treatment anti-corrosion pipeline, waste incineration furnace pipeline
7. Selection, Installation & Operation Notes
7.1 Selection Guidelines
Match material strictly according to working temperature, design pressure, conveying medium and corrosive environment. Do not exceed rated temperature, pressure and medium scope. High temperature and pressure conditions must adopt boiler-grade alloy steel pipe. Chloride environment shall select 316L and above corrosion-resistant materials.
7.2 Installation Construction Requirements
Use sawing or lathe cutting instead of flame cutting. Match special welding electrode for alloy steel pipe. Preheat before welding and stress relief treatment after welding. Reserve thermal expansion gap for high-temperature pipelines to avoid stress concentration and cracking.
7.3 Operation & Maintenance
Heat up and boost pressure slowly during commissioning, avoid sudden cooling and heating. Regularly inspect pressure, temperature and pipeline leakage. Empty internal medium and do anti-rust treatment for long-term shutdown. Prohibit over-pressure and over-temperature operation.
8. Transportation, Loading & Storage
Use special lifting tools, prohibit throwing, collision and dragging. Pad buffer materials during transportation and cover rainproof cloth outdoors. Store in dry and ventilated warehouse, keep away from acid and corrosive substances. Equip plastic end caps for pipe ports, apply anti-rust oil on surface. Stack by material and specification with limited stacking height.
9. Safety Warning
Prohibit use in non-design scenarios such as domestic water and civil gas. Operators must hold valid certificates. Replace damaged, deformed and severely corroded pipes immediately. Recycle waste pipes according to industrial metal regulations.
10. After-Sales Service & Quality Commitment
All products comply with national standards, providing official mill test certificates and inspection reports. Free replacement for quality problems under standard use. Provide technical support for material selection, welding process guidance and non-standard customization. Each batch has unique heat batch number for full quality traceability.
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