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Steel Pipe & Tube & Alloy Steel Pipe，ASTM A335/ASME SA335、ASTM A213NegotiableMOQ: 5 Metric Tons -
Steel Pipe & Tube & Alloy Steel Pipe，ASTM A335/ASME SA335、ASTM A213NegotiableMOQ: 5 Metric Tons
-
Steel Pipe & Tube & Alloy Steel Pipe，ASTM A335/ASME SA335、ASTM A213NegotiableMOQ: 5 Metric Tons
-
Steel Pipe & Tube & Alloy Steel Pipe，ASTM A335/ASME SA335、ASTM A213NegotiableMOQ: 5 Metric Tons
-
Steel Pipe & Tube & Alloy Steel Pipe，ASTM A335/ASME SA335、ASTM A213NegotiableMOQ: 5 Metric Tons
Alloy Steel Pipe Product Detailed Description
1. Product Definition
Alloy steel pipe is a seamless steel pipe made by adding alloy elements such as Chromium (Cr), Molybdenum (Mo), Nickel (Ni), Manganese (Mn) and Vanadium (V) on the basis of carbon steel. The total content of alloy elements is usually more than 5%. It has the characteristics of high strength, high temperature resistance, corrosion resistance and creep resistance, and is an upgraded product of ordinary carbon steel pipe.
2. Main Materials and Chemical Composition
Common Materials (National Standard / American Standard)
15CrMoG / 12Cr1MoVG: Mainstream material for high-pressure boilers, corresponding to ASTM P11 / P12.
12Cr9Mo / P9: Chromium-molybdenum ferritic steel, resistant to high temperature up to 650℃, used for high temperature and high pressure pipelines.
P22 (Cr2Mo): Special for petrochemical high-temperature pipelines, long-term service temperature ≤ 550℃.
T91 / P91: Supercritical boiler steel with 8%-9.5% Chromium, featuring high strength and excellent creep resistance.
Core Function of Alloy Elements
| Element | Core Function |
|---|---|
| Chromium (Cr) | Forms dense oxide film to improve oxidation resistance and corrosion resistance. |
| Molybdenum (Mo) | Strengthens high-temperature strength and creep resistance, suitable for high temperature and high pressure working conditions. |
| Vanadium (V) | Refines grain structure and greatly improves strength and toughness. |
| Nickel (Ni) | Improves low-temperature toughness and enhances acid and alkali corrosion resistance. |
3. Product Specifications
Size Range
Outer Diameter: 10mm - 720mm (custom large diameter available).
Wall Thickness: ≥6mm (mainly heavy wall, thin wall can be customized).
Length: Standard fixed length 6m - 12m, random length 3m - 15m, special length customized acceptable.
Specification Expression
Outer Diameter (mm) × Wall Thickness (mm) × Length (mm), Example: Φ168×18×6000
4. Executive Standards
Chinese National Standards
GB/T 8162-2008: Seamless steel pipes for structural purposes
GB/T 8163-2018: Seamless steel pipes for fluid transportation
GB/T 5310-2023: Seamless steel pipes for high-pressure boilers
GB/T 6479-2013: Seamless steel pipes for high-pressure fertilizer equipment
American Standards
ASTM A335: Ferritic alloy seamless steel pipes for high-temperature service
ASME SA213: Alloy steel pipes for boiler superheater and heat exchanger
5. Production Process
Hot Rolling / Extrusion: Pipe billet → Heating → Piercing → Rolling / Extrusion → Sizing → Cooling → Straightening. High efficiency, suitable for medium and large diameter with uniform wall thickness.
Cold Drawing / Cold Rolling: Pipe billet → Piercing → Annealing → Pickling → Oiling → Multi-pass cold drawing → Heat treatment → Finishing. High dimensional accuracy and smooth surface, suitable for small diameter and thin-wall pipes.
Heat Treatment: Annealing and quenching & tempering to optimize mechanical properties, eliminate internal stress and improve structural stability.
6. Product Features
Mechanical Properties
Tensile Strength: 415-800MPa, 30%-50% higher than ordinary carbon steel.
Yield Strength: ≥205MPa, excellent impact resistance and fatigue resistance.
High Temperature Resistance
Long-term service temperature: 500℃-800℃, no softening or deformation under high temperature with strong creep resistance.
Corrosion Resistance
Resistant to corrosion by steam, oil, gas and acid-base media. The oxide film formed by Chromium can prevent rust expansion, with service life 2-3 times longer than carbon steel pipes.
Other Advantages
100% recyclable, in line with environmental protection policies.
Uniform structure and seamless design, no leakage risk under high pressure, maximum bearing pressure over 30MPa.
7. Main Applications
Power Industry: High-pressure boilers, nuclear power equipment, superheaters, reheaters and main steam pipelines.
Petrochemical Industry: Refinery cracking units, high-pressure fertilizer equipment, oil and gas transmission pipelines.
Machinery Manufacturing: High-strength mechanical parts, hydraulic supports, pressure vessel manufacturing.
Aerospace Industry: High temperature and high pressure pipeline systems, lightweight high-strength structural parts.
Others: Military industry, thermal pipelines, marine high-pressure pipelines and other severe working conditions.
8. Quality Inspection
Dimensional Inspection: Verify outer diameter, wall thickness and length to meet standard tolerance.
Mechanical Test: Tensile, impact and hardness tests to ensure qualified strength and toughness.
Non-destructive Testing: UT, MT, RT inspection to ensure no cracks, inclusions and other defects.
Hydrostatic Test: Pressure test at 1.5 times working pressure, no leakage under pressure holding.
Chemical Analysis: Spectral detection to guarantee alloy element content compliance.
9. Packaging & Delivery
Packaging: Both ends sealed for dust and moisture proof, wrapped with anti-rust film and woven bag. Large diameter pipes bundled with steel strips to avoid deformation during transportation.
Delivery Cycle: 5-7 working days for regular specifications.
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