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Help CenterSteel Pipe & Tube & Alloy Steel Pipe，16MnDG / Q345D、15CrMoG、12Cr1MoVG、P11/P12 (13CrMo44)
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1. Product Overview
Alloy steel pipe is a seamless steel pipe rolled by adding alloy elements such as chromium, molybdenum, vanadium, nickel, manganese and silicon on carbon steel substrate. Different from ordinary carbon steel pipes, it integrates outstanding performance including high temperature resistance, high pressure resistance, creep resistance, corrosion resistance and high strength. Formed by hot rolling, cold drawing and precision rolling processes, it is widely used in thermal power, petrochemical, boiler, pressure vessel, oil & gas transportation, mechanical equipment and other harsh working conditions with high temperature and high pressure, complying with domestic national standards and mainstream overseas industrial standards.
Applicable Standards
Domestic StandardsGB/T 5310, GB/T 6479, GB/T 3087, GB/T 8163, GB/T 9948, GB/T 13296
International Export StandardsASTM A213, ASTM A335, ASTM A387, EN 10216, DIN 17175
2. Main Alloy Grades & Application Conditions
16MnDG / Q345D: Low-temperature alloy pipe, for low-temperature heat exchangers, liquid medium transportation and low-temperature equipment pipelines
15CrMoG: Cr-Mo alloy, for medium & medium-pressure boiler headers, steam pipelines and petrochemical furnace tubes
12Cr1MoVG: High-pressure heat-resistant alloy, boiler superheater, reheater and main steam pipeline of power station, suitable for long-term working under 580℃ high temperature
P11/P12 (13CrMo44): Petroleum hydrogenation unit, high-temperature heat exchanger and refinery pipeline
P91 (10Cr9Mo1VNbN), P92: Supercritical & ultra-supercritical power generating units, excellent high temperature & pressure resistance and creep resistance
3. Complete Production Process
Steel billet incoming inspection & flaw detection → Heating in furnace → Piercing & hot rolling → Sizing & reducing → Cooling → Heat treatment (Normalizing + Tempering / Annealing) → Non-destructive testing → Cold drawing & precision rolling (precision drawn pipe) → Straightening → Inner & outer surface polishing & cleaning → Cutting & chamfering → Hydrostatic test → Dimension re-inspection → Marking & coding → Anti-rust packaging & warehousing
4. Core Specification & Technical Parameters
Outer Diameter Range: 10mm ~ 720mm
Wall Thickness Range: 2mm ~ 120mm, full thickness per national standard with controllable tolerance
Standard Fixed Length: 6m / 12m, customized non-standard length 3–15m available
Heat Treatment PerformanceQuenched and tempered to eliminate rolling stress with uniform grain structure, resisting deformation and cracking under high temperature; tensile strength and yield strength at room & high temperature are far superior to ordinary 20# carbon steel pipes.
Heat & Pressure Resistance Index
Medium & low pressure alloy pipe: Max working pressure ≤10MPa, applicable temperature ≤450℃
High-pressure heat-resistant alloy pipe (12Cr1MoVG / P91): Long-term working temperature 550–620℃, bearing pressure above 25MPa
Surface TreatmentMultiple options: Hot rolled black surface, cold drawn bright surface, sand blasting rust removal, pickling passivation, anti-rust oil coating; free of oxide scale, interlayer and crack defects on inner wall.
Pipe End ProcessingPlain end, bevel end, threaded end and grooved end available, matching welding, flange and clamp connection methods.
5. Core Product Advantages
Excellent High Temperature & Pressure Resistance, Stable Creep ResistanceWith Cr, Mo, V alloy elements added, strength attenuation is slow under high temperature, no deformation or cracking during long-term high temperature & pressure operation, perfectly fit continuous high-temperature working conditions of power stations and boilers.
Anti-Oxidation & Anti-Hydrogen Corrosion, Medium ResistanceChromium element forms dense protective oxide film to resist corrosion by steam, hydrogen, oil products and weak acid & alkali medium, service life far longer than ordinary carbon steel pipes.
Superior Mechanical Performance with High Safety FactorOutstanding impact toughness, tensile strength and yield strength, not easy to brittle fracture under low temperature, suitable for alternating circulation environment of high and low temperature.
Clean & Smooth Inner Wall without ImpuritiesPrecision rolling process ensures smooth inner wall free of oxide scale, reducing scaling risk and pipeline pressure loss during fluid transportation.
Good MachinabilitySupport cutting, welding, pipe bending and secondary heat treatment modification, convenient for field processing and installation of various equipment.
Sufficient Stock & Stable Delivery CycleFull series of materials and specifications in stock, shipped from Tianjin Port, production & delivery cycle 5–7 days, customized heat treatment, dimension and surface treatment for bulk orders.
6. Main Application Fields
Thermal Power Industry: Boiler superheater, reheater, water wall, header and main steam pipeline
Petrochemical Industry: Hydrogenation reactor pipeline, cracking furnace tube, oil & gas transportation, high-temperature heat exchange pipeline of refinery
Pressure Vessel Equipment: High-pressure heat exchanger, evaporator and connecting pipe of gas storage cylinder
Coal Chemical Industry: High temperature & high pressure transmission pipeline for coal-to-oil and syngas
Nuclear Power Supporting Equipment: Auxiliary high-temperature heat exchange pipeline
Construction Machinery: High-pressure hydraulic oil pipeline and high-temperature hydraulic system steel pipe
Low-temperature Engineering: Liquid nitrogen & liquid oxygen transportation pipeline and connecting pipe of low-temperature storage tank
7. Factory Inspection & Qualification Documents
Full inspection for each batch with complete supporting documents attached to shipment:
Dimensional tolerance inspection of appearance, outer diameter, wall thickness and length
Hydrostatic pressure burst test
Eddy current & ultrasonic non-destructive testing (UT/ET) to detect internal cracks and interlayers
Metallographic structure, tensile, impact and hardness mechanical tests
Third-party high-temperature creep rupture test report (special for high-pressure boiler pipes)
Material test certificate, factory certificate, SGS/CE export certification report
8. Packaging, Marking & Logistics
Packaging: Single pipe covered with plastic anti-rust bag, bundled with steel strips, both ends sealed by plastic protective caps; export pipes can be packed in wooden cases for moisture-proof and rust-proof
Marking: Pipe body printed with material grade, outer diameter × wall thickness, execution standard, heat number and manufacturer information; product certificate label attached to each bundle
Delivery: Direct shipment from warehouse to Tianjin Port, suitable for full container (20GP/40HQ) and LCL export; delivery cycle 5–7 days
9. Comparison: Alloy Steel Pipe VS Ordinary Seamless Carbon Steel Pipe
| Comparison Item | Alloy Steel Pipe | Ordinary 20# Seamless Carbon Steel Pipe |
|---|---|---|
| High Temperature Resistance | Stable long-term service at 500–620℃ | ≤425℃, prone to softening and creep at over-temperature |
| Pressure Bearing Capacity | Above 25MPa maximum | Conventional ≤6.4MPa |
| Corrosion Resistance | Resist steam, hydrogen, weak acid & alkali corrosion | Only for clean water & normal temperature air, easy to oxidize & rust under high temperature |
| Service Life | 8–15 years under high temperature working condition | Severe corrosion within 1–3 years under high temperature environment |
| Applicable Scenarios | Boilers, power plants, petrochemical plants, high-pressure equipment | Normal temperature water supply & drainage, low-pressure fluid, general mechanical structure |
| Purchase Cost | Relatively high | Low cost |
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