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Solitaire Overseas is one of the established alloy steel tubes manufacturers in India, supplying seamless and ERW tubing to industrial buyers across 60+ countries. As experienced alloy steel tube suppliers, we produce tubes from high-grade raw materials alloyed with elements in the range of 1.0% to 50% by weight, delivering superior mechanical properties including high tensile strength, hardness, toughness, wear resistance and corrosion resistance. We supply both seamless and ERW alloy steel tubes across a comprehensive range of grades, sizes, wall thicknesses and schedules to meet the exacting demands of industrial buyers worldwide.
Whether you require ASTM A213 chrome moly tubes for high-pressure boiler applications, ASME SA213 chromium molybdenum tubing for heat exchangers and power plants, or AISI 4130/4140 mechanical tubing for structural applications, Solitaire Overseas delivers products in compliance with international standards, backed by full mill test certification and third-party inspection reports. We export to the USA, Germany, Belgium, Italy, Turkey, Denmark, the UK, UAE, Singapore, South Korea, Australia and 50+ additional countries.
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Alloy steel tubes are hollow cylindrical products manufactured from steel that has been intentionally combined with one or more elements such as chromium, molybdenum, manganese, silicon, vanadium, or nickel to achieve mechanical and thermal performance characteristics beyond those of plain carbon steel. The alloying elements are added in controlled proportions, typically between 1% and 50% by weight, depending on the end application.
Alloy steel is categorised into two primary groups:
The versatility of alloy steel tubing makes it the material of choice in industries where plain carbon steel cannot meet operating conditions, including high-temperature power generation, chemical processing under aggressive media, and oil & gas extraction in corrosive environments. Compared to carbon steel, alloy steel tubes offer significantly higher creep resistance at elevated temperatures and better performance under cyclic stress critical factors in applications like boiler superheaters and steam headers.
As experienced alloy steel tube suppliers, we stock and supply alloy steel tubes across all major ASTM / ASME grades. Browse our individual grade pages for detailed specifications, pricing, and availability. Our full range also includes Alloy Steel Boiler Tubes and Alloy Steel Heat Exchanger Tubes.
| Grade | Standard | Internal Link | Key Application |
|---|---|---|---|
| T1 | ASTM A213 / A335 | Alloy Steel T1 Tubes | Moderate-temperature steam service |
| T2 | ASTM A213 / A335 | Alloy Steel T2 Tubes | Low-alloy steam service, low-pressure boilers |
| T5 | ASTM A213 / A335 | Alloy Steel T5 Tubes | High-temperature, sulphur-bearing environments |
| T9 | ASTM A213 / A335 | Alloy Steel T9 Tubes | High-pressure, high-temperature steam |
| T11 | ASTM A213 / A335 | Alloy Steel T11 Tubes | Boiler superheaters, heat exchangers |
| T12 | ASTM A213 / A335 | Alloy Steel T12 Tubes | Superheaters, reheaters |
| T22 | ASTM A213 / A335 | Alloy Steel T22 Tubes | Power plant headers, steam lines |
| T23 | ASTM A213 / A335 | Alloy Steel T23 Tubes | Ultra-supercritical boilers |
| T91 | ASTM A213 / A335 | Alloy Steel T91 Tubes | Ultra-high-temperature, creep-resistant applications |
| T92 | ASTM A213 / A335 | Alloy Steel T92 Tubes | Advanced USC power plants |
| AISI 4130 | ASTM A519 | AISI 4130 Tubes | Structural & mechanical tubing |
| AISI 4140 | ASTM A519 | AISI 4140 Tubes | High-strength mechanical applications |
We also supply application-specific products such as Alloy Steel Boiler Tubes. Read our complete guide to alloy steel boiler tubes.
International buyers often need to cross-reference ASTM grades against European (Werkstoff/DIN) and UNS designations. Here are the standard equivalents:
| ASTM Grade | Werkstoff Nr. | UNS | Trade Name |
|---|---|---|---|
| T5 | 1.7362 | K41545 | 5Cr-1/2Mo |
| T9 | 1.7386 | S50400 | 9Cr-1Mo |
| T11 | 1.7338 | K11597 | 10CrMo5-5 |
| T12 | 1.7335 | K11562 | 13CrMo4-5 |
| T22 | 1.7380 | K21590 | 10CrMo9-10 |
| T91 | 1.4903 | K91560 | X10CrMoVNb9-1 |
All alloy steel tubes supplied by Solitaire Overseas conform to the following dimensional and quality standards:
| Parameter | Details |
|---|---|
| Standard | ASTM A213 / ASME SA213, ASTM A519, ASTM A335 / ASME SA335 |
| Dimensions | As per ASTM, ASME, and API standards |
| Outer Diameter | 6.25 mm to 228.6 mm (custom diameters available) |
| Wall Thickness | 1 mm to 200 mm |
| Tube Size | ½" OD up to 5" OD; custom diameters on request |
| Schedule | SCH 20, 30, 40, STD, 60, 80, XS, 100, 120, 140, 160, XXS |
| Type | Seamless / ERW / EFW / Welded |
| Form | Round, Square, Rectangular, Hydraulic |
| Length | Single Random, Double Random, Cut Length |
| Surface Finish | Anodized, Brushed, Plain, Pickled & Passivated |
| Unit Length | 3 m, 6 m, 12 m |
| End Finish | Plain End, Bevelled End, Threaded |
| C | Cr | Mn | Mo | P (max) | S (max) | Si |
|---|---|---|---|---|---|---|
| 0.05–0.15 | 1.00–1.50 | 0.30–0.60 | 0.44–0.65 | 0.025 | 0.025 | 0.50–1.00 |
| Property | Value |
|---|---|
| Tensile Strength (min) | 415 MPa |
| Yield Strength (min) | 205 MPa |
| Elongation (min) | 30% |
| Hardness | Per ASTM A213 / ASME SA213 requirements |
Proper heat treatment is critical to achieving the mechanical properties required from alloy steel tubing. The table below outlines heat treatment parameters for the most common grades:
| Grade | Heat Treatment Type | Normalising Temp. (°C) | Subcritical Annealing / Tempering Temp. (°C) |
|---|---|---|---|
| T5 | Full/Isothermal Anneal or Normalise & Temper | — | 675 |
| T9 | Full/Isothermal Anneal or Normalise & Temper | — | 675 |
| T11 | Full/Isothermal Anneal or Normalise & Temper | — | 650 |
| T22 | Full/Isothermal Anneal or Normalise & Temper | — | 675 |
| T91 | Normalise & Temper / Quench & Temper | 1040–1080 | 730–800 |
| T92 | Normalise & Temper | 1040–1080 | 730–760 |
| Process | OD Range (mm) | Tolerance (mm) |
|---|---|---|
| Hot Rolled | OD ≤ 101.6 | +0.4 / −0.8 |
| Hot Rolled | 101.6 < OD ≤ 190.5 | +0.4 / −1.2 |
| Hot Rolled | 190.5 < OD ≤ 228.6 | +0.4 / −1.6 |
| Cold Drawn | OD < 25.4 | ± 0.10 |
| Cold Drawn | 25.4 ≤ OD ≤ 38.1 | ± 0.15 |
| Cold Drawn | 38.1 < OD < 50.8 | ± 0.20 |
| Cold Drawn | 50.8 ≤ OD < 76.2 | ± 0.25–0.30 |
| Cold Drawn | 76.2 ≤ OD ≤ 101.6 | ± 0.38 |
Every alloy steel tube supplied by Solitaire Overseas undergoes rigorous quality control before dispatch. Our processes exceed standard industry requirements to ensure product integrity for safety-critical and high-pressure applications.
Solitaire Overseas holds ISO 9001:2015 certification and supplies to clients in regulated industries globally. Our technical team has 20+ years of experience in high-performance steel tubes. All products are backed by a documented chain of traceability from raw material to despatch. View our certificates at Certificates.
Alloy steel tubes are engineered for performance in high-stress, high-temperature, and chemically aggressive environments. We also supply application-specific products such as Alloy Steel Boiler Tubes and Alloy Steel Heat Exchanger & Condenser Tubes for specialised end uses.
| Industry | Typical Application | Common Grade |
|---|---|---|
| Oil & Gas | Downhole tubing, flow lines, high-pressure process piping | T9, T22, P91 |
| Power Generation | Boiler superheaters, reheaters, steam headers | T11, T22, T91, T92 |
| Chemical & Petrochemical | Reactor vessels, process piping, corrosive fluid transport | T5, T9, AISI 4130 |
| Heat Exchangers | Shell & tube exchangers, condenser tubing | T11, T22, T91 |
| Paper & Pulp | Digester lines, high-temperature steam circuits | T11, T22 |
| Food Processing | Hygienic process piping, heat exchanger tubes | T9, AISI 4140 |
| Fabrication | Structural and mechanical tubing for custom fabrication | AISI 4130, AISI 4140 |
| Water Treatment | High-pressure filtration and treatment systems | T5, T9 |
| Pharmaceutical | Ultra-clean process lines requiring high surface integrity | T11, AISI 4130 |
| Heating Systems | Steam and hot water distribution circuits | T1, T2, T5 |
| General Industrial | Hydraulic cylinders, mechanical drive shafts, pressure vessels | AISI 4130, AISI 4140 |
Buyers often need to clarify whether they require alloy steel tubes (ASTM A213) or Alloy Steel Pipes (ASTM A335). The table below outlines the key differences:
| Parameter | Alloy Steel Tubes | Alloy Steel Pipes |
|---|---|---|
| Standard | ASTM A213 / ASME SA213 | ASTM A335 / ASME SA335 |
| Specified by | Outer Diameter (OD) + Wall Thickness (WT) | Nominal Pipe Size (NPS) + Schedule |
| Primary use | Heat exchangers, boilers, structural/mechanical | High-temperature pressure piping systems |
| Dimensional tolerance | Tighter — precision OD/WT control | Based on NPS schedule system |
| Typical grades | T5, T9, T11, T22, T91 | P5, P9, P11, P22, P91 |
Choosing between alloy steel and other materials? Compare alloy steel vs stainless steel →
| Feature | Seamless | ERW / EFW Welded |
|---|---|---|
| Manufacturing | Extruded/pierced from solid billet — no weld seam | Rolled strip welded by electric resistance or fusion welding |
| Mechanical properties | Uniform throughout — no weld joint weakness | Adequate for lower-pressure applications |
| Pressure rating | Higher — preferred for safety-critical service | Lower — suitable for general industrial use |
| Cost | Higher unit cost | More economical for standard applications |
| Preferred for | High-pressure, high-temperature, boiler, heat exchanger | General fabrication, structural, low-pressure fluid service |
All alloy steel tubes are carefully packed prior to shipment to ensure product integrity throughout transit. Our standard packing methods include:
We supply to domestic clients across India and export to the USA, Germany, Belgium, Italy, Turkey, Denmark, the UK, UAE, Singapore, South Korea, Australia, and 50+ additional countries. Our global logistics network ensures on-time delivery with full compliance documentation.
Not sure which alloy steel product is right for your application? Read our guide to choosing alloy steel pipes for industrial use →
An alloy steel tube is a hollow cylindrical section manufactured from steel combined with one or more alloying elements such as chromium, molybdenum, manganese, silicon, or vanadium in quantities typically between 1% and 50% by weight. These additions enhance specific mechanical properties such as tensile strength, hardness, toughness, corrosion resistance, and high-temperature stability beyond what plain carbon steel can achieve. They are used extensively in boilers, heat exchangers, power plants, oil & gas, and chemical processing applications.
Alloy steel tubes (ASTM A213/ASME SA213) are specified by outer diameter and wall thickness and are mainly used in heat exchangers, boilers and structural/mechanical applications. Alloy steel pipes (ASTM A335/ASME SA335) are specified by nominal pipe size and schedule and are used mainly in high-temperature pressure piping systems. Tubes generally carry tighter dimensional tolerances than pipes.
Our alloy steel seamless tubes are supplied to ASTM A213 / ASME SA213 (Cr-Mo grades T1 through T92), ASTM A335 / ASME SA335 (equivalent pipe grades), and ASTM A519 (AISI 4130/4140 mechanical tubing).
Seamless tubes are extruded or pierced from a solid billet with no weld seam, giving uniform mechanical properties and a higher pressure rating preferred for high-pressure, high-temperature, boiler and heat exchanger service. ERW/EFW tubes are rolled strip welded by electric resistance or fusion welding, offering a more economical option adequate for general fabrication and lower-pressure applications.
We supply T1, T2, T5, T9, T11, T12, T22, T23, T91 and T92 to ASTM A213/A335, plus AISI 4130 and 4140 mechanical tubing to ASTM A519.
Yes. Every shipment can include a mill test certificate (EN 10204 3.1B), third-party inspection reports, 100% radiography test reports where specified, raw material test reports, heat treatment charts and a material traceability report.
MOQ varies by grade, size and schedule, we support both bulk project orders and smaller trial or breakdown-replacement quantities. Share your specification with our sales team for a project-specific quote.
We export to the USA, Germany, Belgium, Italy, Turkey, Denmark, the UK, UAE, Singapore, South Korea, Australia and 50+ additional countries.
Chromium improves oxidation and corrosion resistance, while molybdenum increases high-temperature strength and creep resistance. Together they allow Cr-Mo alloy tubes to maintain mechanical integrity under the sustained high temperature and cyclic stress found in boiler superheaters, reheaters and steam headers conditions plain carbon steel cannot reliably withstand.
Wall thickness ranges from 1 mm to 200 mm, across schedules SCH 20, 30, 40, STD, 60, 80, XS, 100, 120, 140, 160 and XXS, depending on grade and outer diameter.
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Ready to order from one of the established alloy steel tubes manufacturers in India? Contact our team for a quote, or browse our full Alloy Steel Products range and Certificates for documentation.