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Help CenterSteel Pipe & Tube & Alloy Steel Pipe，15CrMo、T11/SA213 T11、T9/SA213 T9
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1. Product Definition
Alloy Steel Pipe is a seamless steel pipe made by adding alloying elements such as chromium (Cr), molybdenum (Mo), vanadium (V), nickel (Ni) to carbon steel, followed by hot rolling or cold drawing. Its core features are high temperature resistance, high pressure resistance, creep resistance, and corrosion resistance, with performance far superior to ordinary carbon steel pipes. It is widely used in high-end heavy-duty conditions such as power stations, boilers, chemical industry, and petroleum.
2. Core Product Advantages
Excellent high-temperature performance: Can operate stably at 450℃–650℃ for a long time, resisting creep and high-temperature oxidation, not easy to deform or crack.
High pressure resistance: Yield strength ≥295MPa, tensile strength ≥450MPa, pressure resistance up to 10–32MPa, suitable for high-pressure vessels and pipelines.
Strong corrosion resistance: Chromium-molybdenum elements form a dense oxide film, resisting sulfur and hydrogen corrosion, suitable for harsh media environments such as chemical and oil/gas.
Good low-temperature toughness: High low-temperature impact energy, not easy to brittle fracture at -40℃, suitable for cold regions and cryogenic conditions.
Long service life & easy maintenance: Service life up to 15–30 years, no frequent anti-corrosion required, low comprehensive cost, 100% recyclable, meeting environmental protection and energy conservation requirements.
3. Common Material Grades & Applications
Low Alloy Steel Pipe (Alloy content ＜5%, mainstream)
15CrMo: Cr-Mo steel, 450℃–550℃, for medium-pressure boilers, steam pipelines, petroleum cracking pipes.
12Cr1MoVG: Cr-Mo-V steel, 550℃–580℃, high-pressure boiler superheaters, reheaters, power station main steam pipes.
T11/SA213 T11: 1Cr-0.5Mo, 540℃–580℃, boiler heat exchangers, high-temperature oil/gas pipelines.
Q355B (16Mn): High-strength low alloy, -20℃–425℃, pressure vessels, structural pipes, low-temperature pipelines.
Medium Alloy Steel Pipe (Alloy content 5%–10%)
T9/SA213 T9: 9Cr-1Mo, 580℃–650℃, high-pressure boilers, petrochemical high-temperature reactors, hydrogen-resistant pipelines.
P91 (10Cr9Mo1VNb): 600℃–650℃, supercritical boilers, power station main steam pipelines, high-temperature and high-pressure equipment.
High-Alloy Corrosion-Resistant Pipe (Special conditions)
Inconel 625 (NS3306): Ni-Cr-Mo alloy, -196℃–980℃, deep-sea oil/gas, chemical heat exchange, high-purity fluid transmission.
4. Specification Parameters (Seamless pipe mainstream)
Size Range
Outer Diameter: 10mm–630mm (common 21.3mm–325mm).
Wall Thickness: 2.0mm–80mm (high-pressure thick wall up to 100mm).
Length: Standard 6m/9m/12m; custom 2m–18m available, tolerance +15mm/-5mm.
Tolerance & Precision
Outer Diameter Tolerance: Hot-rolled ±1.0mm, cold-rolled precision ±0.03mm.
Wall Thickness Tolerance: Hot-rolled ±12.5%, cold-rolled ±0.05mm.
Theoretical Weight: W(kg/m)=0.02466×Thickness×(Outer Diameter−Thickness).
Surface Condition
Hot-rolled black, pickled natural color, bright BA finish, electrolytic polished EP, sandblasted.
5. Production Process
Hot-rolled Alloy Pipe (Mainstream)
Steel billet → Heating (1150–1250℃) → Piercing → Hot rolling → Sizing → Cooling → Straightening → Heat treatment (Normalizing + Tempering) → Inspection → Packaging.
Cold-rolled Precision Alloy Pipe
Hot-rolled billet → Pickling → Cold rolling (multi-pass) → Annealing → Finishing → Inspection → Packaging (high precision, thin wall).
Heat Treatment Condition
Normalizing + Tempering: Standard delivery, balanced plasticity and toughness.
Solution Annealing: For corrosion-resistant alloys, easy processing and welding.
Age Hardening: For high-strength high-pressure applications, tensile strength ≥1200MPa.
6. Execution Standards
Chinese Standards: GB/T 8162 (structural pipe), GB/T 8163 (fluid pipe), GB 5310 (high-pressure boiler pipe), GB 6479 (chemical fertilizer pipe).
American Standards: ASTM A213, ASME SA213 (boiler superheater), ASTM A335 (high-temperature pipeline).
German Standard: DIN 17175; Japanese Standard: JIS G3458.
7. Main Applications
Power/Power Station: High-pressure boiler superheaters, reheaters, main steam pipes, water wall pipes (12Cr1MoVG, P91).
Petrochemical: High-temperature oil/gas transmission, cracking units, hydrogenation reactors, hydrogen-resistant pipelines (15CrMo, T9, Inconel 625).
Pressure Vessels: High-pressure storage tanks, heat exchangers, reactors, boiler drums (Q355B, 15CrMo).
Coal Chemical/Fertilizer: High-pressure ammonia synthesis pipelines, reformer tubes, corrosion-resistant pipelines (15CrMo, 12Cr1MoVG).
Cryogenic Engineering: LNG pipelines, cryogenic equipment (Q355B, low-temperature alloy).
8. Delivery Cycle
Stock Items: 15CrMo, 12Cr1MoVG (OD 21.3–219mm, WT 3–20mm) → 3–5 working days.
High-pressure Thick Wall/Large Diameter: P91, T9, OD 273–630mm, WT 30–80mm → 7–10 working days.
Cold-rolled Precision/Corrosion-Resistant Alloy: Inconel 625, precision sizes → 10–15 working days.
Export Orders: Export packaging, inspection, English mill certificates → 12–18 working days.
9. Quality Inspection
Full inspection: chemical composition, tensile/yield strength, elongation, impact toughness (room/low temperature), hardness, hydrostatic test (1.5×design pressure), non-destructive testing (UT/MT/RT), dimensional tolerance, surface check. Defects such as cracks, inclusions, delaminations and leaks are strictly prohibited. Mill certificates, mechanical reports, NDT reports and heat treatment reports provided for full traceability.
10. Packaging Method
Domestic: 6m/9m bundles (1–5 pcs), steel band strapped, plastic end caps, marked with spec/grade/heat number/batch number.
Export: Inner waterproof film + outer woven bag/steel sheet reinforced, wooden pallets/crates, moisture/rust/collision proof, compliant with marine and inspection standards.
Custom: Single-piece packaging, polished film coating, threaded protective sleeves, shockproof packaging for precision pipes.
11. Storage & Usage Precautions
Storage: Dry/ventilated warehouse, elevated ≥20cm. Avoid moisture. Classify by grade/spec/heat treatment. Keep away from acids/alkalis.
Processing: Polish cuts and touch up anti-rust paint immediately; preheat before welding (15CrMo≥150℃, P91≥200℃), post-weld heat treatment to eliminate stress.
Selection: Medium-temperature & high-pressure → 15CrMo; high-temperature & high-pressure → 12Cr1MoVG, P91; low-temperature → Q355B; strong corrosion → Inconel 625.
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