Contact Platform Support
Help CenterSteel Pipe & Tube & Alloy Steel Pipe,GB/T 5310-2023, GB/T 8162, ASTM A335, ASME SA213
Related Products
-
Steel Pipe & Tube & Petroleum Steel Pipe，Gr.B、X42、X52、X60、X65、X70、X80NegotiableMOQ: 5 Metric Tons -
Steel Pipe & Tube & Stock High Pressure Boiler Tube，GB/T 5310-2023, GB/T 8163, GB/T 17395NegotiableMOQ: 5 Metric Tons
-
Steel Pipe & Tube & Precision Steel Pipe，40Cr、42CrMo、35CrMo、20Cr、27SiMn、12Cr1MoV、Cr5Mo、Cr9Mo、10#、20#、35#、45#、16Mn(Q345B/C/D)NegotiableMOQ: 5 Metric Tons
-
Steel Pipe & Tube & Cast Pipe，DN80、DN100、DN150、DN200、DN300、DN400、DN600、DN800、DN1000、DN1200、DN1600、DN2000、DN2600NegotiableMOQ: 5 Metric Tons
-
Steel Coil & Strip & Hot Rolled Steel Coil，Q195、Q215B、Q235B、Q355B/Q355C/Q355D、Q390、Q420、SPHC、SPHD、SPHENegotiableMOQ: 5 Metric Tons
1. Product Introduction
Alloy seamless steel pipes are produced by hot rolling, cold drawing or hot extrusion processes, made from premium carbon steel doped with chromium, molybdenum, nickel, manganese, vanadium and other alloying elements. Compared with conventional carbon steel tubes, they deliver outstanding tensile strength, stable high-temperature performance, reliable anti-corrosion capacity and superior low-temperature impact toughness. They are widely adopted for severe working conditions involving high heat, heavy pressure and corrosive media.
2. Material Grade & Chemical Composition
2.1 Functions of Main Alloy Elements
| Alloy Element | Core Performance Function |
|---|---|
| Chromium (Cr) | Boost anti-oxidation, anti-corrosion and hardenability; form compact protective oxide layer above 600°C |
| Molybdenum (Mo) | Reinforce high-temperature creep strength, ideal for long-term pressure-bearing high-temperature pipelines |
| Nickel (Ni) | Improve low-temperature toughness and chemical stability, enhance overall corrosion resistance |
| Manganese (Mn) | Elevate tensile strength and hardening property, act as deoxidizer and desulfurizer |
| Vanadium (V) | Refine internal grain structure, greatly upgrade tensile strength and impact toughness |
| Titanium (Ti) | Stabilize carbide structure, effectively prevent intergranular corrosion |
| Niobium (Nb) | Strengthen high-temperature creep resistance and lasting heat strength |
2.2 Common Steel Grades & Corresponding Industry Standards
Domestic GB Standards
15CrMoG: Cr-Mo heat-resistant alloy steel, continuous working temperature ≤550°C, widely used for medium-pressure boilers and steam conveying pipelines
12Cr1MoVG: Cr-Mo-V alloy steel with premium high-temperature strength, max service temperature ≤580°C, applied for high-pressure boiler superheaters and reheaters
10Cr9Mo1VNb (T91): High-alloy heat-resistant pipe material, service temperature up to 625°C, suitable for supercritical power boilers and nuclear piping systems
Q345D (16Mn): Low-alloy high-strength structural steel, used for low-temperature pipeline frames and supporting structures
International ASTM & ASME Standards
SA-213 T12 (equivalent to 15CrMoG), SA-213 T22 (equivalent to 12Cr2MoG), SA-213 T91
SA335 P11 / P12 / P22 / P91: Ferritic seamless alloy pipes for high-temperature service, OD range: 60.3–1067mm, wall thickness: 2–150mm
3. Product Classification
3.1 Classified by Total Alloy Content
Low-alloy Steel Pipe: Total alloy element content below 5%, represented by Q345D and 15CrMo. Cost-effective option for medium & low-pressure boilers and pressure vessels
Medium-alloy Steel Pipe: Total alloy content between 5%–10%, typical grade 12Cr1MoV. Excellent heat & pressure resistance for thermal power plants and petrochemical equipment
High-alloy Steel Pipe: Total alloy content over 10%, including T91 and nickel alloy tubes. Stable mechanical performance under extreme working conditions, used in aerospace and nuclear energy sectors
3.2 Classified by Manufacturing Technology
Hot Rolled Seamless Alloy Pipe: Manufactured by heating billets, piercing and hot rolling. High production efficiency, fit for large OD and heavy wall pipes. Outer diameter: 57–630mm, wall thickness: 3.5–100mm
Cold Drawn Seamless Alloy Pipe: Processed by cold drawing after hot rolling blank pretreatment. Features precise dimension tolerance and smooth surface, applicable for small OD thin-wall pipes. Outer diameter: 10–159mm, wall thickness: 1–20mm
3.3 Classified by Application Scenarios
High Pressure Boiler Tubes: Comply with GB/T 5310-2023 standard, used for boiler drums and superheaters; working pressure ≥9.8MPa, service temperature 480–620°C
Petroleum Cracking Tubes: Deployed in refinery high-temperature cracking furnaces, operating temperature 450–550°C, resistant to hydrogen sulfide corrosion
High Pressure Fertilizer Tubes: Designed for high-pressure medium transportation in fertilizer factories, with outstanding low-temperature resistance and hydrogen corrosion resistance
Mechanical Structural Tubes: Used for engineering machinery and hydraulic cylinder components, with high structural strength and tight dimensional accuracy
4. Typical Mechanical Performance Parameters
| Steel Grade | Tensile Strength (MPa) | Minimum Yield Strength (MPa) | Elongation (%) | Working Temperature Range |
|---|---|---|---|---|
| 15CrMoG | 440–640 | ≥295 | ≥22 | ≤550°C |
| 12Cr1MoVG | 470–640 | ≥255 | ≥21 | ≤580°C |
| T91 | ≥585 | ≥415 | ≥20 | ≤625°C |
| Q345D | 490–620 | ≥345 | ≥21 | -40°C ~ 450°C |
5. Standard Specifications
Outer Diameter: 10–1067mm, mainstream sizes: 57,76,89,108,159,219,273,325,426,530,630mm
Wall Thickness: 1–150mm, common wall thickness: 3.5,4,6,8,10,12,14,16,20,25,30mm
Length: Standard fixed length 6–12 meters; customized multiple lengths and short cut lengths are acceptable
Dimensional Tolerance: OD tolerance ±0.5%~±1%, wall thickness tolerance ±10%~±12.5%; high precision pipes reach ±5% wall thickness tolerance
6. Complete Production Flow
Raw Material Inspection: Adopt qualified alloy steel ingots or continuous casting billets; inspect chemical composition and surface defects
High-temperature Heating: Heat pipe billets to 1100–1250°C inside heating furnace for uniform metal plasticity
Piercing Forming: Process heated solid billets into hollow tube shells via piercing mill
Shaping Processing
Hot Rolling: Roll tube shells to control outer diameter and wall thickness
Cold Drawing: Pickle and phosphorate hot rolled blanks before cold drawing to improve surface finish and dimensional precision
Heat Treatment: Normalizing + tempering for T91; full annealing for 15CrMo series, to optimize metallographic structure and eliminate internal residual stress
Finishing Treatment: Straightening, end cutting, chamfering, NDT inspection (UT, MT, RT), anti-rust coating (anti-rust oil or black protective paint)
Final Inspection: Dimensional check, mechanical property test, hydrostatic pressure test (minimum test pressure ≥10MPa), full chemical composition analysis
7. Product Competitive Advantages
Excellent Heat Resistance: Stable mechanical property under long-term 450–625°C high temperature, no permanent deformation
Strong Pressure Bearing Capacity: Max bearing pressure up to 32MPa, perfect for high-pressure reactors and pipeline systems
Superior Anti-corrosion Property: Resist oxidation, hydrogen sulfide and hydrogen embrittlement corrosion, suitable for chemical and oil refining corrosive environments
Reliable Low-temperature Toughness: Grades like Q345D maintain good impact resistance at -40°C, avoid brittle fracture under low temperature
Extended Service Lifespan: Stable internal structure and strong anti-fatigue performance, service life 2–3 times longer than ordinary carbon steel pipes
8. Main Application Industries
Power Generation Industry: Supercritical & subcritical boiler superheaters, reheaters, main steam pipeline
Petrochemical Industry: High-temperature cracking furnace tubes, hydrogenation unit pipelines, high-pressure reactors, long-distance oil & gas transmission pipelines
Coal Chemical Industry: High-pressure gasifier piping, coal-to-hydrogen equipment pipelines, anti-high pressure and hydrogen corrosion
Machinery Manufacturing: Hydraulic cylinders, high-pressure gas cylinders, high-strength structural parts for construction machinery
Shipbuilding Industry: Marine boiler pipes, power system high-pressure pipelines, shock and heat resistant
9. Delivery Status & Packing Solution
Delivery Heat Treatment State: Normalized & tempered, full annealed, quenched & tempered (customized per steel grade and buyer’s demand)
Packing Method: Bundled packing, 2–5 tons per bundle, pipe ends sealed and wrapped with moisture-proof plastic film. Small OD pipes packed in wooden cases; large OD pipes bulk shipped with anti-rust treatment
Production & Shipment Lead Time: 5–7 working days. Goods shipped from Tianjin Port, nationwide domestic delivery available
10. Quality Control Standards & Certifications
Applicable Standards: GB/T 5310-2023, GB/T 8162, ASTM A335, ASME SA213
Authorized Certifications: ISO9001 Quality Management System, CE, API 5L. We can supply full set documents including material test certificate, mechanical test report and non-destructive testing report.
Send Inquiry to This Supplier
You May Also Like
-
Steel Coil & Strip & Cold Rolled Steel Tube，DC01、DC03、DC04、DC05、DC06、SPCC、DC01~DC06、SPCC、SPCD、SPCE、SPCFNegotiableMOQ: 5 Metric Tons
-
Steel Coil & Strip & Color Coated Coil，Z80/Z100/Z120/Z180；AZ100/AZ150；ZM100/ZM150NegotiableMOQ: 5 Metric Tons
-
Steel Sheet & Plate & Pressure Vessel Steel Plate，SA516 Gr60/65/70, SA285 GrC, SA387 Gr12/22, SA203 E、P265GH、P355GH、P355NL、P460NH、P500QNegotiableMOQ: 5 Metric Tons
-
Steel Sheet & Plate & Shipbuilding Steel Plate，ASTM A131、EN 10025、JIS G3106NegotiableMOQ: 5 Metric Tons
-
Steel Sheet & Plate & Boiler Steel Plate，ASTM A516 Gr60/70、SA387 Gr11/Gr22、EN 10028 P265GH、P355NH、JIS G3115NegotiableMOQ: 5 Metric Tons
-
Steel Sheet & Plate & Steel Sheet Pile，PU10、PU12、PU16、PU22、FSP-IVNegotiableMOQ: 5 Metric Tons
-
Steel Rebar & Deformed Steel Bar，HRB400、HRB400E、HRB500、HRB500ENegotiableMOQ: 5 Metric Tons
-
Steel Wire & Coil Wire，Q195、Q235、SAE1006、SAE1008、45#、65#、72B、82BNegotiableMOQ: 5 Metric Tons
-
Flat Steel & Flat Steel Bar，Q235B、Q355B、40Cr、42CrMoNegotiableMOQ: 5 Metric Tons
-
Steel Angle & Angle Bar，2#、2.5#、3#、4#、5#、6.3#、7#、8#、10#、12#、14#、16#、18#、20#NegotiableMOQ: 5 Metric Tons
