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Help CenterSteel Pipe & Tube & Alloy Steel Pipe,12Cr1MoVG、15CrMoG、P91/T91，1Cr5Mo、P5，15CrMo、12Cr2Mo，42CrMo、40Cr
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Steel Pipe & Tube & Precision Steel Tube,10#、20#、35#、45#、16Mn、40Cr、42CrMo、35CrMo、20Cr、27SiMn、12Cr1MoV、Cr5Mo、Cr9MoNegotiableMOQ: 5 Metric Tons
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Steel Coil & Strip & Hot Rolled Steel Coil，Q235B，Q355B/C/D，Q390/Q420，SPHC，SPHD/SPHENegotiableMOQ: 5 Metric Tons
1. Product Overview
Alloy steel pipe is a special steel pipe based on iron-carbon matrix with alloy elements such as chromium, molybdenum and vanadium added. Seamless alloy steel pipe is the mainstream product. Different from ordinary carbon steel pipe, it integrates outstanding performances including high temperature resistance, high pressure resistance, sulfide corrosion resistance, superior low-temperature toughness, high strength and high pressure bearing capacity. As special pressure-bearing pipes for high-temperature and high-pressure & corrosive working conditions, they are widely used in high-end industrial fields such as power boilers, petroleum refining, coal chemical industry and engineering machinery.
2. Core Product Classification
(1) Classification by Forming Process
Hot Rolled Seamless Alloy Steel Pipe (Mainstream for Large Diameter & Heavy Wall)Formed through heating, piercing, continuous rolling and sizing of round billets. Outer diameter ranges from 168mm to 1200mm, wall thickness 6mm to 100mm. Featuring high production efficiency, it is suitable for high-pressure main pipelines, boiler headers and chemical reaction pipelines.
Cold Drawn / Cold Rolled Precision Alloy Steel Pipe (Small Diameter & Thin Wall)Processed by multi-pass cold drawing with high dimensional accuracy and smooth surface. Outer diameter 6mm–168mm, wall thickness 0.5mm–20mm. Applied to heat exchangers, instrument pipelines, hydraulic equipment and small boiler superheater tubes.
Alloy Welded Steel Pipe (Large Diameter Structural Pipe)Manufactured by longitudinal submerged arc welding or spiral welding, maximum outer diameter up to 2500mm. Mostly used for large steel structures and transmission pipelines with lower pressure bearing capacity than seamless pipes.
(2) Classification by Service Condition
High-pressure Boiler Alloy Pipe: Grades 12Cr1MoVG, 15CrMoG, P91/T91, applicable to main steam pipelines, superheaters and reheaters of 500–700℃ supercritical boilers.
Petroleum Cracking Alloy Pipe: 1Cr5Mo, P5, resistant to high-temperature sulfur corrosion, for refinery cracking furnaces and hydrogenation units.
High-pressure Chemical Fertilizer Alloy Pipe: 15CrMo, 12Cr2Mo, used for high-pressure ammonia synthesis and gasification furnace pipelines in coal chemical industry.
Structural Alloy Steel Pipe: 40Cr, 42CrMo, for mechanical processing, hydraulic supports and spindle sleeves of engineering machinery without high-temperature service requirements.
Low-temperature Corrosion-resistant Alloy Pipe: Nickel-based alloy pipes for low-temperature oil & gas and acid corrosive pipelines.
3. Main Material Grades (GB Standard vs ASTM Standard)
3.1 Chromium-Molybdenum Heat-resistant Alloy (Most Widely Used)
| GB Grade | ASTM Standard | Core Properties | Service Temperature Limit |
|---|---|---|---|
| 15CrMo / 15CrMoG | A335 P12 / A213 T12 | Medium-temperature heat resistance & anti-oxidation | ≤550℃ |
| 12Cr1MoVG | A335 P22 / A213 T22 | High creep strength under high temperature & high pressure | ≤580℃ |
| 1Cr5Mo | A335 P5 / A213 T5 | Sulfur corrosion resistance, dedicated for oil refining | ≤600℃ |
| 10Cr9Mo1VNbN | A335 P91 / A213 T91 | Special for supercritical boilers | ≤650℃ |
3.2 Structural Alloy Steel
40Cr, 42CrMo, 20CrMo, 35CrMo. Featured with high strength, wear resistance and easy quenching & tempering, not suitable for high-temperature working conditions.
Functions of Alloy Elements
Cr (Chromium): Improve high temperature resistance, anti-oxidation, acid & alkali corrosion resistance and hardenability.
Mo (Molybdenum): Resist high-temperature creep and enhance long-term strength under high pressure.
V (Vanadium): Refine grain structure, improve pipe toughness and fatigue resistance.
Ni (Nickel): Greatly enhance low-temperature impact toughness and resistance to acidic medium corrosion.
4. Executed Standards
Domestic GB Standards
GB/T 5310-2023 Seamless Alloy Steel Tubes for High-pressure Boilers
GB 9948-2006 Seamless Steel Tubes for Petroleum Cracking
GB 6479-2013 Seamless Steel Tubes for High-pressure Fertilizer Equipment
GB/T 8162-2018 Seamless Steel Tubes for Structural Purposes
GB/T 8163-2018 Seamless Steel Tubes for Liquid Service
International Common Standards
ASTM A335 (High-temperature Ferritic Alloy Steel Pipe), ASME SA213 (Boiler & Heat Exchanger Small Tubes), DIN 17175, EN 10216-2, JIS G3467
5. Dimension Specifications
Outer Diameter (OD): 6mm–1200mm, customized maximum up to 1500mm for extra-large diameter.
Wall Thickness (WT): Thin wall 0.5–5mm, regular wall 5–40mm, maximum heavy wall up to 100mm.
Standard Length: 6m, 9m, 12m, arbitrary customized lengths available.
Dimensional Tolerance
Outer Diameter: ±0.5% ~ ±1%
Wall Thickness: ±10%
Length: ±5mm
Pipe End Processing: Flat ends, bevel ends, thread processing available on request.
6. Complete Production Process
Electric furnace refining → LF/VD secondary refining (strict control S ≤ 0.02%, P ≤ 0.025%) → Continuous casting round billet → Billet grinding & flaw detection → Heating & piercing → Pipe rolling / cold drawing forming → Heat treatment (Normalizing & Tempering / Quenching & Tempering) → Straightening → Cutting & Chamfering → Hydrostatic Test → Non-destructive Testing (UT Ultrasonic Test + MT Magnetic Particle Test) → Surface Treatment → Marking & Warehousing
Core Heat Treatment Process to Guarantee Performance
15CrMo / 12Cr1MoVG: Normalized at 930–960℃ + High-temperature tempering at 680–720℃ to eliminate internal stress and boost high-temperature creep performance.
42CrMo Structural Pipe: Quenching + High-temperature tempering to obtain high strength and high toughness.
Precision Cold Drawn Pipe: Annealing for softening to guarantee plastic processing performance.
7. Core Product Advantages
Integrally seamless forming: No welding seam, eliminate leakage risk under high pressure, much higher safety factor than welded pipes.
Adaptable to extreme working conditions: Resist high temperature up to 700℃, low temperature impact down to -40℃, and corrosion of hydrogen sulfide, acid, alkali and oil & gas.
Stable mechanical properties: Tensile strength ≥415MPa, yield strength ≥205MPa, excellent anti-fatigue and anti-burst performance.
High dimensional accuracy: Wall thickness tolerance of cold drawn pipe up to ±0.1mm, suitable for precision equipment assembly.
Excellent machinability: Support cutting, bending, welding, threading and flange processing.
Full-range inspection: Complete tests including hydrostatic test, ultrasonic test, magnetic particle test, metallographic analysis, tensile test and impact test. Certificates EN 10204 3.1 / 3.2 can be issued.
8. Main Application Industries
Thermal Power Generation: Water wall, superheater, reheater and main steam header of supercritical boilers.
Petrochemical Industry: Crude oil cracking furnaces, hydrogenation units and sulfur-resistant oil & gas gathering pipelines.
Coal Chemical & Chemical Fertilizer: High-pressure synthetic towers and high-pressure gas transmission pipelines for coal gasification.
Nuclear Power: Feedwater and steam heat exchange pipelines of conventional islands.
Engineering Machinery: Hydraulic cylinder sleeves, mine hydraulic supports and transmission shafts.
Heat Exchange Equipment: Heat exchanger tubes for power plants and chemical cooling devices.
Pressure Vessels: High-pressure storage tanks and connecting pipes of reaction equipment.
9. Surface Treatment & Export Packing
Optional Surface Treatment
Hot rolled black finish (conventional stock product)
Pickled bright surface (precision cold drawn pipe)
Sand blasting & rust removal with anti-rust oil coating
Anti-corrosion coating: 3PE, FBE epoxy powder, black paint
Seaworthy Export Packing
Small tubes: Bundled with woven bags & steel strips, both ends sealed with plastic end caps.
Large diameter heavy wall pipes: Bundled with steel strips and fixed on wooden pallets.
Full anti-rust & moisture-proof treatment, fully compliant with ocean shipping standards.
10. Delivery Cycle & Qualifications
Conventional stock specifications: 5–7 days delivery, shipped from Tianjin Port.
Supporting Certifications: ISO9001, API, CE, BV / ABS ship classification certification, original material test certificate, third-party flaw detection report and full set of export customs clearance documents.
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