Alloy Steel Pipe
High-Temperature Seamless Alloy Steel Pipe & Tube Our Seamless Alloy Steel Pipes deliver exceptional performance, surpassing standard carbon seamless pipes. Fortified with Chromium (Cr) and other alloying elements, these pipes offer superior high-temperature resistance, low-temperature toughness, and unmatched corrosion resistance.
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Product Range: High-Temperature Alloy Steel Tube, Alloy Pressure Pipe.
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Size Range: OD: 1/8″ – 42″ | WT: SCH 10 up to XXH & Heavier.
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Key Standards: ASTM A335, ASTM A213, ASTM A209, ASTM A519, EN 10216-2, DIN 17175, JIS G3462.
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Applications: Ideally suited for severe environments in Petroleum, Aerospace, Chemical, Petrochemical, Power Generation, Boilers, and Military industries.
Description
1. Product Description & Application
Alloy steel pipe is a kind of seamless steel pipe whose performance is much higher than general seamless steel pipes. Because this steel pipe contains Chromium (Cr) inside, its high-temperature resistance, low-temperature endurance, and corrosion-resistant performance remain unmatched by other non-alloy pipe joints. The more extensive use of alloy tubes is seen across petroleum, aerospace, chemical, electric power, boiler, military, and other heavy industries.
The alloy steel pipe adopts high-quality carbon steel, alloy structural steel, and stainless & heat-resisting steel as raw material, manufactured through hot rolling or cold drawing processes. By adding different metal elements at specific ratios, the mechanical properties of the alloy steel are precisely optimized.
Primary Applications: Alloy steel seamless pipes are ideally suited for energy-related applications characterized by severe conditions. Key sectors include:
- Chemical industries
- Petrochemical industries
- Energy-related applications (Power generation, Boilers)
- Aerospace and Military Industry
2. General Specifications & Standards
- Size Range: 1/8″ – 42″
- Schedules: 20, 30, 40, Standard (STD), Extra Heavy (XH), 80, 100, 120, 140, 160, XXH & heavier
- Lengths: Single Random, Double Random, Cut Length
- Grades: ASTM A335 P1, P2, P5, P9, P11, P12, P22, P23, P91, P92 | ASTM A213 T2, T5, T5b, T5c, T9, T11, T12, T22, T23, T91, T92
| Product Name | Executive Standard | Dimension (mm) | Steel Code / Steel Grade |
|---|---|---|---|
| ASTM / ASME | |||
| Seamless Ferritic and Austenitic Alloy Steel Boiler, Superheater and Heat-Exchanger Tubes | ASTM A213 | Ø10.3~426 x WT1.0~36 | T5, T9, T11, T12, T22, T91 |
| Seamless Ferritic Alloy Steel Pipes for High Temperature Use | ASTM A335 | Ø1/4″~42″ x WT2~120mm | P5, P9, P11, P12, P22, P91, P92 |
| Seamless Carbon and Alloy Steel for Mechanical Tubing | ASTM A519 | Ø16″~42″ x WT10~100mm | 4130, 4130X, 4140 |
| EN | |||
| Seamless Ferritic Alloy Steel Pipes for High Temperature Use | EN10216-2 | Ø8″~42″ x WT15~100 | 13CrMo4-5, 1-CrMo9-10, X10CrMoVNb9-1, 15NiCuMoNb5-6-4 |
3. Dimension Tolerances
Outside Diameter Tolerance
| Process | Outside Diameter (OD), mm | Tolerance, mm |
|---|---|---|
| Hot rolled | OD ≤ 101.6 | +0.4 / -0.8 |
| 101.6 < OD ≤ 190.5 | +0.4 / -1.2 | |
| 190.5 < OD ≤ 228.6 | +0.4 / -1.6 | |
| Cold Drawn | OD < 25.4 | ±0.10 |
| 25.4 ≤ OD ≤ 38.1 | ±0.15 | |
| 38.1 < OD < 50.8 | ±0.20 | |
| 50.8 ≤ OD < 63.5 | ±0.25 | |
| 63.5 ≤ OD < 76.2 | ±0.30 | |
| 76.2 ≤ OD ≤ 101.6 | ±0.38 | |
| 101.6 < OD ≤ 190.5 | +0.38 / -0.64 | |
| 190.5 < OD ≤ 228.6 | +0.38 / -1.14 |
Wall Thickness Tolerance
| Process | Outside Diameter / Wall Thickness (WT), mm | Tolerance, % |
|---|---|---|
| Hot rolled | OD ≤ 101.6, WT ≤ 2.4 | +40 / -0 |
| OD ≤ 101.6, 2.4 < WT ≤ 3.8 | +35 / -0 | |
| OD ≤ 101.6, 3.8 < WT ≤ 4.6 | +33 / -0 | |
| OD ≤ 101.6, WT > 4.6 | +28 / -0 | |
| OD > 101.6, 2.4 < WT ≤ 3.8 | +35 / -0 | |
| OD > 101.6, 3.8 < WT ≤ 4.6 | +33 / -0 | |
| OD > 101.6, WT > 4.6 | +28 / -0 | |
| Cold Drawn | OD ≤ 38.1 | +20 / -0 |
| OD > 38.1 | +22 / -0 |
4. Chemical & Mechanical Properties
Chemical Composition (%)
| Grade | UNS | C | Mn | P (Max) | S (Max) | 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 max | 0.30~0.60 | 0.025 | 0.025 | 0.5 max | 4.00~6.00 | 0.44~0.65 |
| P5b | K51545 | 0.15 max | 0.30~0.60 | 0.025 | 0.025 | 1.00~2.00 | 4.00~6.00 | 0.44~0.65 |
| P5c | K41245 | 0.12 max | 0.30~0.60 | 0.025 | 0.025 | 0.5 max | 4.00~6.00 | 0.44~0.65 |
| P9 | S50400 | 0.15 max | 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 | 0.5 max | 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 | 0.5 max | 2.65~3.35 | 0.80~1.60 |
| P22 | K21590 | 0.05~0.15 | 0.30~0.60 | 0.025 | 0.025 | 0.5 max | 1.90~2.60 | 0.87~1.13 |
| P91 | K91560 | 0.08~0.12 | 0.30~0.60 | 0.02 | 0.01 | 0.20~0.50 | 8.00~9.50 | 0.85~1.05 |
| P92 | K92460 | 0.07~0.13 | 0.30~0.60 | 0.02 | 0.01 | 0.5 max | 8.50~9.50 | 0.30~0.60 |
Mechanical Properties
| Tensile Strength, MPa | Yield Strength, MPa | Elongation, % |
|---|---|---|
| 415 min | 205 min | 30 min |
5. Manufacturing Process
Our alloy steel pipes are produced using state-of-the-art metallurgical processes. From the Blast Furnace/Electric Arc Furnace, through Dephosphorization and Vacuum Oxygen Decarburization (VOD), down to continuous casting and the Mannesmann or Extrusion pipe making process. This meticulous control guarantees the highest structural integrity.
6. Packing & Delivery
Bundled Package
- One bundle of steel tubes shall be the same in batch number, steel grade, and specification. The rest of the tubing less than one bundle should be tied into small bundles.
- The weight of each bundle should be less than 50kg. The max weight cannot exceed 80kg per bundle unless there are special requirements.
- When the length is ≥ 6m: Tied with at least 8 strapping bands, divided into 3 groups (3-2-3).
- When the length is < 6m: Tied with at least 5 knots, divided into 3 groups (2-1-2).
- When the length is ≥ 3m: Tied with at least 3 bands, divided into 3 groups (1-1-1).
Wooden Box Package
- The wooden box is suitable for cold rolling or cold drawing seamless steel tubes and polished hot rolled stainless steel tubes.
- When the outer diameter is ≥ 10mm, the maximum weight of the container should be 50kg.
- When the outer diameter is < 10mm, the maximum weight of the container should be 30kg.
- Protected internally with wooden slats, steel hoops, polyethylene plugs, and polyethylene sheets.