Seamless Alloy Steel Tube
seamless alloy steel tubes engineered for extreme high-temperature and high-pressure environments including petrochemical processing plants, power generation boiler networks, refinery heat exchangers, and heavy industrial pressure vessels. We guarantee flawless crystalline grain microstructures, precise wall thickness concentricity, and strict mechanical yield tolerances under our direct [2-Hour Rapid Quote] mill program.
Tired of slow supplier responses while your critical project bidding deadline closes in? Terrified of receiving sub-standard alloy tubes that split under pressure tests or fail on-site ultrasonic inspections, risking massive liability and project shutdown? Eliminate cross-border purchasing risks and secure your mill-verified testing logs immediately.
PRODUCT DETAILS
Seamless Alloy Steel Tube Three-Standard Cross Matrix
| American Grade (ASTM A335 / A213) | European Grade (EN 10216-2) | Japanese Grade (JIS G3458 / G3462) | Core Alloy Composition | Target Temperature Environment |
|---|---|---|---|---|
| ASTM A335 P11 / T11 | EN 10216-2 13CrMo4-5 | JIS G3458 STPA22 | 1.25% Cr, 0.50% Mo | Up to 550°C (Boiler Lines) |
| ASTM A335 P22 / T22 | EN 10216-2 10CrMo9-10 | JIS G3458 STPA24 | 2.25% Cr, 1.00% Mo | Up to 600°C (Refinery Crackers) |
| ASTM A335 P91 / T91 (High-Tensile) | EN 10216-2 X10CrMoVNb9-1 | JIS G3458 STPA26 | 9% Cr, 1% Mo, V, Nb | Up to 650°C (Supercritical Plants) |
Technical QA/QC Verification
• Uncompromised MTC Traceability: All pipeline consignments are systematically dispatched with original EN 10204 3.1 Mill Test Certificates (MTC) linked to verified ladle heats, confirming tensile limits, yield stress ratios, hardness bounds, and high-pressure hydrostatic burst thresholds. Fully prepared for third-party auditing by SGS, Bureau Veritas, or Lloyd’s Register.
• Capital Security Guarantee: We eliminate international transactional friction completely by approving major structural framework and energy pipeline allotments through 100% Irrevocable Letters of Credit (L/C) at sight payment architectures.
Anti-Oxidant Packaging & Ocean Logistics
• Secured Hexagonal Sea Bundling & Rigid Bracing: Tubes are bound into tight hexagonal bundles using high-tensile steel strapping and heavy canvas lifting slings. Bundles are secured inside ocean containers using structural timber blocks, cross-bracing wedges, and industrial tie-down lashing line systems to isolate dynamic motion over volatile ocean routes.
• Complimentary Extended Port Demurrage: SXY Steel Group provides 14 to 21 days of complimentary container demurrage directly at your target port of discharge, ensuring your logistics brokers have an extended operational window to clear destination custom import filings.
Product introduction
Seamless Alloy Steel Tube
Type: Alloy Pipe, Alloy Tube, Alloy Steel Pipe, Alloy Steel Tube
Application: In Petroleum, Aerospace, Chemical, Power, Boilers, Military Industry
Specification: Outside Diameter: 1/8” ~ 26”
Wall Thickness: SCH 30, 30, 40, 60, 80, 120, 140, 160, XS, XXS, STD
Length: Single Random, Double Random, Cut Length max to 23m
Standard & Grade: ASTM A333, A335 P5/P9/P11/P22/P91, DIN 17175, JIS G3458
End: Plain End, Beveled End, Thread End
Packing: Bundled with Hemp Rope/In Bulk
Alloy pipe is a kind of seamless steel pipe, its performance is much higher than that of general seamless steel pipe, because this type of steel pipe contains more Cr, its high temperature resistance, low temperature resistance, corrosion resistance performance is much better than other Steel pipe , so the alloy pipe is widely used in petroleum, aerospace, chemical, electric power, boiler, military and other industries.
| Product | SEAMLESS / ERW / SAW ALLOY STEEL PIPE |
| Dimension | 6 mm – 1080 mm |
| Thickness | 1mm – 135 mm |
| Length | 3 m – 12 m or according to the requirements of clients |
| Standard | ASTM GB DIN |
| Steel grade | A106/53/179/214/192/210 A/B/C ST37.2/35.4/35.8/52/52.3/52.4/42/45 10# 20# 45# P2, P12, P11, P22, P5, P9, P91 T2, T11, T5, T9, T22, 4140, 12CrMo, 15CrMo, 12Cr2Mo, 1Cr5Mo, 2CrMo4, 1Cr9Mo, 10CrMo910, etc. |
| Trade terms | FOB/CIF/CFR |
| Payment terms | T/T, L/C |
| Delivery port | Tianjin, China |
| Delivery time | 10 or according to the real quantity of the tubes |
| Surface treatment | Black painting Varnish painting 3PE Hot galvanized or other coating according to your requirements Bare tube |
| End of tubes | Beveled, plain, thread, plastic caps |
| Inspection | Ultrasonic examination, eddy inspection, hydrostic testing etc. |
| Package | Bundles, lossen or according to your requirements |
| Certificate | API 5L/5CT, ISO, PED etc. |
Technical data
Chemical Composition
Technical Data
Chemical Composition
| C, % | Mn, % | P, % | S, % | Si, % | Cr, % | Mo, % |
|---|---|---|---|---|---|---|
| 0.05-0.15 | 0.30-0.60 | 0.025 max | 0.025 max | 0.50-1.00 | 1.00-1.50 | 0.44-0.65 |
Mechanical Properties
| Tensile Strength, MPa | Yield Strength, MPa | Elongation, % |
|---|---|---|
| 415 min | 205 min | 30 min |
Outside Diameter & Tolerance
| Standard | Process | Outside Diameter | Tolerance |
|---|---|---|---|
| ASTM A450 | Hot rolled | OD ≤ 101.6 mm | +0.4 / -0.8 mm |
| 101.6 < OD ≤ 190.5 mm | +0.4 / -1.2 mm | ||
| 190.5 < OD ≤ 228.6 mm | +0.4 / -1.6 mm | ||
| Cold Drawn | OD < 25.4 mm | ±0.10 mm | |
| 25.4 ≤ OD ≤ 38.1 mm | ±0.15 mm | ||
| 38.1 < OD < 50.8 mm | ±0.20 mm | ||
| 50.8 ≤ OD < 63.5 mm | ±0.25 mm | ||
| 63.5 ≤ OD < 76.2 mm | ±0.30 mm | ||
| 76.2 ≤ OD ≤ 101.6 mm | ±0.38 mm | ||
| 101.6 < OD ≤ 190.5 mm 190.5 < OD ≤ 228.6 mm | +0.38 / -0.64 mm +0.38 / -1.14 mm | ||
| ASTM A530 & ASTM A335 | NPS | 1/8 ≤ OD ≤ 1-1/2 inch | ±0.40 mm |
| 1-1/2 < OD ≤ 4 inch | ±0.79 mm | ||
| 4 < OD ≤ 8 inch | +1.59 / -0.79 mm | ||
| 8 < OD ≤ 12 inch | +2.38 / -0.79 mm | ||
| OD > 12 inch | ±1% |
Wall Thickness & Tolerance
| Standard | Process | Specification | Tolerance |
|---|---|---|---|
| ASTM A450 | Hot rolled | OD ≤ 101.6 mm, WT ≤ 2.4 mm | +40 / 0 % |
| OD ≤ 101.6 mm, 2.4 < WT ≤ 3.8 mm | +35 / 0 % | ||
| OD ≤ 101.6 mm, 3.8 < WT ≤ 4.6 mm | +33 / 0 % | ||
| OD ≤ 101.6 mm, WT > 4.6 mm | +28 / 0 % | ||
| OD > 101.6 mm 2.4 < WT ≤ 3.8 mm 3.8 < WT ≤ 4.6 mm WT > 4.6 mm | +35 / 0 % +33 / 0 % +28 / 0 % | ||
| Cold Drawn | OD ≤ 38.1 mm | +20 / 0 % | |
| OD > 38.1 mm | +22 / 0 % | ||
| ASTM A530 | NPS | 1/8 ≤ OD ≤ 2-1/2 inch | +20 / -12.5 % |
| 3 ≤ OD ≤ 18 inch, WT/OD ≤ 5% | +22.5 / -12.5 % | ||
| 3 ≤ OD ≤ 18 inch, WT/OD > 5% | +15 / -12.5 % | ||
| OD > 20 inch, WT/OD ≤ 5% | +22.5 / -12.5 % | ||
| OD > 20 inch, WT/OD > 5% | +15 / -12.5 % |
Standard
ASTM A335–for Seamless Ferritic Alloy-Steel Pipe for High-Temperature Service
ASTM A519–for Seamless Carbon and Alloy Steel Mechanical Tubing
ASTM A213–for Seamless Ferritic and Austenitic Alloy-Steel Boiler, Superheater, and Heat-Exchanger Tubes
ASTM ASME (S)A-335/(S)A-335M Grade and Chemical Composition
Chemical Composition
| Grade | UNS | C ≤ | Mn | P ≤ | S ≤ | Si ≤ | Cr | Mo |
|---|---|---|---|---|---|---|---|---|
| P1 | K11522 | 0.10~0.20 | 0.30~0.80 | 0.025 | 0.025 | 0.10~0.50 | – | 0.44~0.65 |
| P2 | K11547 | 0.10~0.20 | 0.30~0.61 | 0.025 | 0.025 | 0.10~0.30 | 0.50~0.81 | 0.44~0.65 |
| P5 | K41545 | 0.15 | 0.30~0.60 | 0.025 | 0.025 | 0.50 | 4.00~6.00 | 0.44~0.65 |
| P5b | K51545 | 0.15 | 0.30~0.60 | 0.025 | 0.025 | 1.00~2.00 | 4.00~6.00 | 0.44~0.65 |
| P5c | K41245 | 0.12 | 0.30~0.60 | 0.025 | 0.025 | 0.50 | 4.00~6.00 | 0.44~0.65 |
| P9 | S50400 | 0.15 | 0.30~0.60 | 0.025 | 0.025 | 0.50~1.00 | 8.00~10.00 | 0.44~0.65 |
| P11 | K11597 | 0.05~0.15 | 0.30~0.61 | 0.025 | 0.025 | 0.50~1.00 | 1.00~1.50 | 0.44~0.65 |
| P12 | K11562 | 0.05~0.15 | 0.30~0.60 | 0.025 | 0.025 | 0.50 | 0.80~1.25 | 0.44~0.65 |
| P15 | K11578 | 0.05~0.15 | 0.30~0.60 | 0.025 | 0.025 | 1.15~1.65 | – | 0.44~0.65 |
| P21 | K31545 | 0.05~0.15 | 0.30~0.60 | 0.025 | 0.025 | 0.50 | 2.65~3.35 | 0.80~1.60 |
| P22 | K21590 | 0.05~0.15 | 0.30~0.60 | 0.025 | 0.025 | 0.50 | 1.90~2.60 | 0.87~1.13 |
| P91 | K91560 | 0.08~0.12 | 0.30~0.60 | 0.020 | 0.010 | 0.20~0.50 | 8.00~9.50 | 0.85~1.05 |
| P92 | K92460 | 0.07~0.13 | 0.30~0.60 | 0.020 | 0.010 | 0.50 | 8.50~9.50 | 0.30~0.60 |
Note:
(S)A335 P91 other chemical composition are: V 0.18~0.25; N 0.030~0.070; Ni ≤ 0.40; Al ≤ 0.04; Nb 0.06~0.10
(S)A335 P92 other chemical composition are: V 0.15~0.25; N 0.030~0.070; Ni ≤ 0.40; Al ≤ 0.04; Nb 0.04~0.09; W 1.5~2.00; B 0.001~0.006
Packing and shipping
Our company has passed ISO9001 quality management system certification, Our Mill product with CE/EN10204 / ASTM/Classification society certificate/CASO/BIS etc certificate.All the customers give good appreciation to our products.We are glad to be your good partner.
Application Areas
Steel is widely used in steel structure workshops, bridge frames, main structures of high-rise buildings, and infrastructure construction (such as highways, oil and gas pipelines). Its high strength properties ensure load-bearing stability and seismic performance. In ship manufacturing, steel is used to build hull structures, decks, and internal components. Hot-rolled coils rely on their load-bearing capacity to adapt to harsh environments.
Factory workshop
With a commitment to excellence, innovation, and sustainability, the company has established itself as a trusted partner in the international steel industry.After nearly two decades of relentless endeavour, our client base now spans over 110 countries and regions across Europe, the Middle East, South America, and Southeast Asia.
Free Refinery/Power Project Drawing Audit & Alloy Pipe Nesting Optimization Cost Assessment
Preparing procurement parameters for an industrial pipeline network, refinery heat exchanger bank, high-pressure boiler construction, or power plant infrastructure tender? Upload your specified pressure limits, sizing schedules, alloy grades, or raw Bill of Materials (BOM) files below. SXY Steel Group’s engineering desk will perform a professional nesting optimization analysis to eliminate drop-off scrap margin loss and balance your budgets.
