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Help CenterSteel Pipe & Tube & Alloy Steel Pipe，16Mn、15CrMo、12Cr1MoVG、P91、P92、16MnDG、A333 Gr.6
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1. Basic Definition & Production Process
Alloy steel pipe is manufactured by adding alloy elements (Cr, Mo, Ni, V, Mn, Si, etc.) into carbon steel base material, then processed into seamless or welded pipes via hot rolling, cold drawing, hot extrusion and other forming technologies. Alloy elements significantly improve the pipe’s high-temperature resistance, pressure resistance, corrosion resistance and mechanical strength compared with ordinary carbon steel pipes.
Complete production flow:Steel billet inspection → Heating → Piercing/rolling → Sizing → Cooling → Straightening → Nondestructive testing → Heat treatment (normalizing, tempering, quenching) → Finishing cutting → Surface polishing → Finished product inspection
Key Performance Features
High tensile strength and yield strength under high temperature and high pressure
Excellent creep resistance, long service life under long-term high-temperature working conditions
Good oxidation resistance and medium corrosion resistance
Stable mechanical properties at low temperature (low-temperature alloy steel pipes)
2. Common Material Grades & Executive Standards
Main Alloy Steel Grades
Low alloy steel: 16Mn, 15CrMo, 12Cr1MoVG, 10CrMo910
Medium-high alloy steel: P91, P92
Low temperature alloy steel: 16MnDG, A333 Gr.6
Domestic & International Standards
GB/T 6479: Seamless Alloy Steel Tubes for High Pressure Fertilizer Equipment
GB/T 5310: Seamless Alloy Steel Tubes for High Pressure Boiler
ASTM A335: Standard Specification for Seamless Ferritic Alloy-Steel Pipe for High-Temperature Service
DIN EN 10216: Seamless steel tubes for pressure purposes
Standard Length
Fixed length 6m / 12m, customized lengths available upon request
3. Common Specification Parameters
Alloy steel pipes cover diversified outer diameters (10mm ~ 820mm) and wall thicknesses (2mm ~ 120mm), customized thin-walled, thick-walled and extra-thick-walled pipes are supported.Conventional connection methods: welding, flange connection, threaded connection (small diameter only)
4. Advantages & Disadvantages
Advantages
Outstanding high temperature & high pressure resistance, applicable for boiler, power station ultra-high pressure pipelines
Strong anti-oxidation & anti-corrosion capacity, resistant to steam, oil, acid and alkali medium erosion
Stable mechanical performance under extreme low or high temperature without deformation or cracking
Long service life for heavy-duty industrial working conditions, low maintenance frequency
Disadvantages
Higher raw material cost than carbon steel and hot-dip galvanized steel pipe
Complex heat treatment processing, higher production cost and longer delivery cycle
Strict welding requirements; special alloy welding rods and preheating & post-heating treatment are required
5. Main Application Fields
Thermal power & boiler industry: Superheater, reheater, steam header, high-pressure water supply pipeline
Petrochemical industry: High-temperature reaction pipeline, oil & gas transmission pipeline, hydrogenation unit pipe
Fertilizer & chemical industry: High-pressure synthetic ammonia pipeline, corrosive medium delivery pipe
Energy industry: Nuclear power auxiliary pipeline, geothermal high-temperature fluid pipeline
Machinery manufacturing: Hydraulic cylinder pipes, high-pressure equipment structural pipes
Refrigeration & low-temperature projects: Low-temperature liquid storage and delivery pipelines
6. Alloy Steel Pipe VS Carbon Steel Pipe / Hot-Dip Galvanized Pipe
| Comparison Item | Alloy Steel Pipe | Carbon Steel / Hot-Dip Galvanized Pipe |
|---|---|---|
| Alloy Composition | Contains Cr, Mo, V, Ni and other alloy elements | Only carbon and manganese, no alloy elements |
| High-temperature Resistance | Excellent, stable above 500℃ | Poor, easy to oxidize and deform over 300℃ |
| Pressure Bearing Capacity | Ultra-high pressure resistance | Only suitable for low & medium pressure |
| Corrosion Resistance | Good resistance to high-temperature medium corrosion | Only surface zinc anti-corrosion, invalid under high temperature |
| Unit Price | High | Low |
| Typical Working Condition | Power plant, petrochemical high-temperature equipment | Fire protection, municipal normal temperature water & gas delivery |
7. Purchasing & Acceptance Standards
Material inspection: Provide original material test certificate, spectrum inspection to verify alloy element content
Nondestructive test: 100% ultrasonic flaw detection / magnetic particle inspection to eliminate internal cracks and defects
Hydrostatic test: Conduct pressure test according to design pressure without leakage or deformation
Heat treatment record: Complete normalizing & tempering records to guarantee mechanical properties
Surface inspection: No cracks, pits, oxide skin, rust and mechanical damage on inner and outer surfaces
Packaging: Waterproof plastic caps at both ends, bundled with steel strips, moisture-proof packaging for export
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