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Help CenterSteel Pipe & Tube & Alloy Steel Pipe，15CrMoG、12Cr1MoVG、P12、P22、P91、P92、16MnDG、30CrMo、42CrMo
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1. Product Overview
Alloy steel pipe is a seamless steel pipe manufactured by adding chromium, molybdenum, vanadium, nickel and other alloy elements into carbon steel base. Compared with carbon steel pipe, it owns outstanding high temperature resistance, high pressure resistance, oxidation resistance, creep resistance and low-temperature toughness. It is widely used in high-temperature, high-pressure, corrosive working conditions such as thermal power, petrochemical, boiler and pipeline engineering.
Alloy Strengthening Principle
Alloy elements can refine metal grain, improve matrix strength and hardness, form dense oxidation protective film under high temperature, slow down metal creep deformation at high temperature, and resist erosion by high-temperature steam, oil medium and acid-base medium, so as to extend service life under severe working conditions.
2. Common Alloy Steel Grades & Mechanical Properties
Main Material Grades
High-temperature boiler alloy pipe: 15CrMoG, 12Cr1MoVG, P12, P22, P91, P92
Low-temperature & medium-pressure alloy pipe: 16MnDG, 30CrMo, 42CrMo
Petrochemical anti-corrosion alloy pipe: 1Cr5Mo, 1Cr9Mo, A335 Gr.P5, P9, P91
Core Mechanical Performance
Yield Strength: 245–835MPa (varies by material grade)
Tensile Strength: 415–1080MPa
Elongation: ≥19%
Hardness: HB 120–220 (annealed delivery state)
Flattening test & impact test: No crack or fracture under standard test temperature
Hydraulic pressure & ultrasonic flaw detection: 100% inspection for finished pipes
3. Executive Standards
Domestic Standards
GB/T 5310 High-pressure Seamless Alloy Steel Tubes for Power StationGB/T 6479 Seamless Alloy Steel Pipes for Fertilizer EquipmentGB/T 13296 Seamless Stainless and Alloy Steel Tubes for Boiler and Heat Exchanger
International Export Standards
ASTM A335 High-Temperature Seamless Alloy Steel PipeASTM A213 Seamless Alloy Steel Tubes for Boiler, Superheater & Heat ExchangerEN 10216-2, DIN 17175
4. Complete Specification Parameters
Outer Diameter Range: 10mm – 720mm, customized super large OD available
Wall Thickness: 2.0mm – 120mm, thin wall, medium wall, heavy wall series
Standard Length: 6m / 12m fixed length; customized 3–18m length acceptable
Pipe End Types
Plain End: For general welding connection
Beveled End: For high-pressure butt welding project
Threaded End: For small-diameter instrument pipeline
Flange prefabricated end: For quick installation of chemical pipelines
5. Production & Quality Inspection Standards
Production ProcessRound steel billet inspection → Heating → Perforating → Hot rolling / cold drawing → Annealing heat treatment → Straightening → Cutting → Surface polishing → Non-destructive testing → Dimension inspection → Marking & packaging
Full Inspection Items
Ultrasonic flaw detection (UT): Detect internal cracks, shrinkage cavity, inclusion defects
Eddy current testing (ET): Check surface tiny cracks
Hydraulic pressure test: Test pressure resistance tightness
Metallographic inspection, hardness test, impact low-temperature test
Dimension tolerance, surface roughness, oxide layer inspection
Surface Quality RequirementsSmooth inner & outer surface, no crack, fold, scab, peeling, indentation, scratch; uniform oxide skin after heat treatment, no serious corrosion pits.
6. Core Product Advantages
Excellent High-Temperature & High-Pressure ResistanceStable mechanical performance under long-term 450–650℃ high temperature and 10–32MPa pressure, no creep deformation, ideal for boiler superheater, steam pipeline.
Strong Medium Corrosion ResistanceResist erosion of high-temperature steam, crude oil, hydrogen, ammonia, sulfur-containing medium, applicable to petrochemical refining, chemical fertilizer production.
Outstanding Low-Temperature ToughnessLow-temperature alloy grades maintain good impact resistance under -40℃ ~ -196℃, no brittle fracture for cryogenic storage and conveying pipeline.
Long Service Life Under Severe Working ConditionsNot easy to aging, deformation and leakage; greatly reduce pipeline replacement frequency and equipment shutdown loss.
Stable Heat Conductivity & Mechanical MachinabilityUniform texture after professional annealing treatment, support cutting, bending, welding, forging and deep processing.
7. Main Application Fields
Thermal Power Industry: Boiler superheater, reheater, header, high-pressure steam main pipe
Petrochemical Industry: Oil refinery furnace tube, high-temperature reaction pipeline, hydrogen production pipeline, natural gas transmission pipeline
Chemical Fertilizer Plant: High-pressure synthesis pipeline, ammonia & nitrogen conveying pipe
Coal Chemical Industry: Coal gasification high-temperature pipeline, waste heat recovery heat exchange tube
Cryogenic Equipment: Liquid nitrogen, liquid oxygen low-temperature storage and delivery pipeline
Machinery Manufacturing: High-pressure hydraulic cylinder pipe, engine high-temperature pipeline, heavy equipment axle sleeve
Nuclear power, metallurgy, heat exchange equipment and pressure vessel supporting pipes
8. Packaging, Shipment & Lead Time
Packaging: Small diameter pipes packed in wooden cases; medium & large diameter bundled with steel strips, both ends equipped with plastic protective caps; export products wrapped with waterproof plastic film to prevent rust during sea transportation
Lead Time: 7–10 days for conventional stock specifications; 10–20 days for customized special materials, extra thick wall and ultra-long pipes
Minimum Order Quantity: 5 tons; free sample segments for material inspection available
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