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Help CenterSteel Pipe & Tube & Alloy Steel Pipe，ASTM A213，ASTM A335，EN10216，JIS G3458
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1. Product Overview
Alloy steel pipe, also known as seamless alloy steel pipe, is a high-end seamless pipe with outstanding high temperature and high pressure resistance and low temperature and corrosion resistance.
Made of high-quality carbon steel substrate with precisely added chromium, molybdenum, nickel, vanadium and other alloy elements, refined through professional smelting, hot rolling, cold drawing and integral heat treatment processes.
Compared with ordinary carbon steel pipes and galvanized steel pipes, seamless alloy steel pipes feature higher mechanical strength, better high-temperature stability, excellent creep resistance and strong environmental adaptability.
Capable of stable operation under extreme working conditions of high temperature, high pressure, strong corrosion and low temperature freezing, widely used in power, petrochemical, petroleum, boiler and industrial engineering fields.
Integral seamless structure eliminates pipe burst and liquid leakage risks, ensuring high safety and reliability for fluid transportation and structural support.
2. Implementation Standards
GB/T 5310-2017: Seamless Steel Pipes for High-pressure Boilers (Domestic mainstream standard for high-pressure working conditions)
GB/T 6479-2018: Seamless Steel Pipes for High-pressure Chemical Fertilizer Equipment
GB/T 18984-2017: Seamless Steel Pipes for Low-temperature Pipeline Service
International General Standards: ASTM A213, ASTM A335, EN10216, JIS G3458
3. Main Material Grades
Low Alloy Series (General Industrial Use): 16Mn, Q345B, 15CrMo, 12Cr1MoVG
High Alloy Heat-resistant Series (High Temperature & High Pressure Special): T11, T22, T5, P11, P22, 304, 316L
Material Performance: Chromium-molybdenum alloy improves high temperature and high pressure resistance, oxidation resistance and creep resistance of seamless alloy steel pipes; stainless steel alloy significantly enhances low temperature and corrosion resistance.
All raw materials are high-purity with uniform composition, stable performance and no internal impurities, ensuring long-term stable service of pipes under harsh working conditions.
4. Production Process
Raw material re-inspection → Precision proportioning smelting → Billet heating → Piercing forming → Hot rolling / cold drawing precision rolling → Sizing and straightening → Heat treatment (Normalizing + Tempering) → Non-destructive testing → Internal and external wall finishing → Hydrostatic pressure test → Dimensional precision inspection → Marking & Packaging
The standardized precision process ensures every seamless alloy steel pipe is weld-free, high-strength, and equipped with excellent high temperature and high pressure resistance and low temperature and corrosion resistance, fully meeting industrial engineering acceptance standards.
5. Specification Parameters
5.1 Diameter Range
Outer Diameter: 10mm～630mm, covering small-diameter precision pipes, medium-diameter general pipes and large-diameter high-pressure pipes
Custom non-standard special-shaped diameters are available
Full-specification seamless alloy steel pipes adapt to diverse industrial pipeline scenarios relying on superiorhigh temperature and high pressure resistance and low temperature and corrosion resistance
5.2 Wall Thickness Range
Wall Thickness: 2.0mm～80mm, including thin-wall, medium-thick wall, thick-wall and extra-thick wall pressure-bearing pipes
Dimensional tolerance strictly controlled within ±0.5mm (national standard)
Stable pressure bearing capacity, uniform low temperature and corrosion resistance and strong high-pressure environment adaptability
5.3 Standard Length
Standard fixed length: 6m / piece, 12m / piece
Custom length: 3m, 9m, 15m and other customized sizes
Support cutting, beveling and various precision finishing processing
5.4 Core Working Parameters
Temperature Resistance: -40℃～600℃, supporting long-term high-temperature continuous operation and stable low-temperature operation
Pressure Resistance: 1.6MPa～16MPa, no deformation or leakage under long-term high pressure
Comprehensive Performance: Excellent high temperature and high pressure resistance, outstanding low temperature and corrosion resistance, high-temperature creep resistance and thermal fatigue resistance
6. Core Product Advantages
Strong High & Low Temperature Adaptability: The seamless alloy steel pipe with chromium-molybdenum alloy formula operates stably at 550℃+ high temperature and ultra-high pressure without softening or cracking, and maintains good toughness at -40℃ low temperature without brittle fracture.
Excellent Corrosion Resistance & Long Service Life: Dense alloy protective structure forms on the pipe wall, featuring superior low temperature and corrosion resistance without extra galvanizing or painting. Resists acid-base corrosion, medium scouring and high-temperature oxidation, with a service life of more than 20 years.
High Safety with Seamless Structure: Integral seamless rolling process eliminates weld weak points. The seamless alloy steel pipe has strong burst resistance and pressure resistance, adapting to flammable, explosive and high-risk industrial scenarios.
Stable Mechanical & Machining Performance: Superior tensile strength and yield strength, good toughness, support cutting, welding, bending, flanging and other deep processing, not easy to deform or crack.
Multi-scene Compatibility: Dual advantages of high temperature and high pressure resistance and low temperature and corrosion resistance meet the needs of high-temperature thermal power, low-temperature refrigeration, chemical corrosion and other complex working conditions.
7. Optional Pipe End Processing
Plain End: Standard finished product, suitable for conventional welding and flange connection
Bevel Processing: Precision bevel finishing for convenient on-site butt welding and tight welding seam
Threading Processing: Precision external thread processing, matched with special pipe fittings for quick installation
Precision Cutting & Polishing: Burr-free smooth pipe ends and inner wall polishing, reducing medium resistance and improving low temperature and corrosion resistance of seamless alloy steel pipes
Optional Accessories: Plastic end caps, anti-rust films, pipe couplings, flange accessories
8. Main Connection Methods
Welding Connection: Mainly used for high-temperature and high-pressure main pipelines, with high sealing performance and stability
Flange Connection: Suitable for large-diameter and high-pressure equipment pipelines, easy to disassemble and maintain
Threaded Connection: Applied to small-diameter precision instrument pipelines and auxiliary pipelines
Ferrule Connection: Special for precision low-temperature and high-pressure small pipelines, zero leakage and high precision
9. Application Scope
Thermal Power Engineering: High-pressure boiler pipes, superheater pipes, economizer pipes, main steam pipelines (relying on excellent high temperature and high pressure resistance)
Petrochemical Engineering: Refining pipelines, hydrogenation reactor pipelines, high-temperature cracking pipelines, acid-base corrosion medium delivery pipelines (relying onlow temperature and corrosion resistance and high-pressure resistance)
Chemical Fertilizer Engineering: High-pressure fertilizer equipment pipelines, corrosive chemical fluid pipelines, low-temperature process pipelines
Energy & Thermal Engineering: Urban thermal pipe networks, high-temperature steam delivery pipelines, new energy supporting pipelines
Mechanical Manufacturing: Hydraulic high-pressure pipelines, mechanical structural supporting pipes, precision equipment matching pipes
Aerospace & Low-temperature Industry: Low-temperature delivery pipelines, high-end precision structural pipes, aerospace supporting pipes
10. Quality Inspection Standards
Qualified Appearance: Smooth surface, no cracks, interlayers, pores, rust or scratches, uniform wall thickness, burr-free pipe ends
Prohibited Defects: Internal and external cracks, wall thickness deviation, severe deformation, rust, unqualified non-destructive testing
Factory Testing Items: 100% ultrasonic non-destructive testing, hydrostatic pressure test, spectral composition detection, mechanical tension & impact test, dimensional sampling inspection
All seamless alloy steel pipes are strictly tested to guarantee stable high temperature and high pressure resistance and low temperature and corrosion resistance
11. Packaging & Delivery Cycle
11.1 Packaging Standard
Conventional pipes: Steel strip binding + plastic end caps + anti-rust film, attached with certificate, material report and batch mark
Export pipes: Waterproof winding + wooden box reinforcement, suitable for long-distance transportation and marine shipping
Strict packaging protects pipe integrity and ensures no attenuation of high temperature and high pressure resistance and low temperature and corrosion resistance
11.2 Graded Delivery Time
Stock Orders: Conventional specifications (16Mn, Q345B, 15CrMo) with standard length, delivery within 3-5 working days
Conventional Custom Orders: Cutting, beveling, polishing, threading processing, delivery within 5-7 working days
Special Custom Orders: High-alloy materials, thick/extra-thick wall, ultra-long size, non-standard pipes, delivery within 7-15 working days
Large Batch & Foreign Trade Orders: Bulk engineering orders and customized pipes, delivery within 15-30 working days, support batch delivery
Urgent Service: Priority production for emergency engineering and maintenance orders
11.3 Trade & Logistics
Support full-truck, logistics line, railway and container multimodal transportation
Accept FOB, CIF and other international trade terms
Provide real-time logistics tracking and complete factory qualification documents
12. Usage Precautions
Select matched material grades according to working conditions: High-alloy seamless alloy steel pipes such as 12Cr1MoVG and T22 are suitable for 600℃ high-temperature environments to exert optimalhigh temperature and high pressure resistance.
For acid-base corrosion and low-temperature delivery scenarios, adopt professional anti-corrosion seamless alloy steel pipes to strengthen low temperature and corrosion resistance and extend pipeline service life.
Use special supporting welding materials for on-site welding, and conduct non-destructive testing after welding to eliminate weld defects.
Ordinary carbon alloy pipes cannot be used for low-temperature working conditions; special low-temperature alloy materials are required to prevent brittle fracture.
Complete pressure test and tightness detection after installation to ensure stable operation and give full play to the pipe’s excellent comprehensive performance.
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