Seamless Steel Tube

Seamless Steel Tube Supplier & Manufacturer

Emirerri Steel is a trusted name in the steel industry, delivering superior quality steel products to customers worldwide. Among our comprehensive product portfolio, Seamless Steel Tubes stand out as one of the most demanded solutions for critical applications across industries. Known for their strength, precision, durability, and resistance to pressure, seamless tubes form the backbone of modern engineering, oil & gas exploration, energy, automotive, and construction sectors.

At Emirerri Steel, we specialize in manufacturing and supplying premium-grade seamless steel tubes that conform to international standards. With advanced production facilities and rigorous quality control, our seamless tubes meet the most challenging operational requirements, ensuring long-lasting performance and safety.

Seamless Stainless Steel Tube
Seamless Stainless Steel Tube
Seamless Carbon Steel Tube
Seamless Carbon Steel Tube
Seamless Alloy Steel Tube
Seamless Alloy Steel Tube

What is a Seamless Steel Tube?

A seamless steel tube is a cylindrical hollow section manufactured without any welding seam or joint. Unlike welded tubes, which are produced by rolling and welding steel strips, seamless tubes are made from a solid round steel billet that is heated and pierced through the center to create a hollow shell. This process provides:

  • Uniform structure and strength across the tube

  • High resistance to pressure and stress

  • Leak-proof performance, crucial for fluid and gas transport

  • Enhanced corrosion and heat resistance

Because of these qualities, seamless tubes are widely preferred for high-pressure, high-temperature, and critical applications.

Standards & Specifications

Carbon Steel Seamless Tubing – Grades by Standard

ASTM / ASME

  • ASTM A106 / SA106 → Grades A, B, C

  • ASTM A53 / SA53 → Grades A, B

  • ASTM A179 / SA179 → Low-Carbon Steel (single grade, no subdivisions)

  • ASTM A192 / SA192 → High-Pressure Carbon Steel (single grade)

  • ASTM A210 / SA210 → Grades A-1, C

  • ASTM A333 / SA333 → Grades 1, 3, 4, 6, 7, 8, 9, 10, 11 (low-temperature service)

  • ASTM A500 → Grades A, B, C, D (structural tubing)

  • ASTM A513 → Various grades depending on type (e.g., 1010, 1020, 1026)

  • ASTM A519 → Grades like 1010, 1020, 1026, 4130, 4140

API (Oil & Gas)

  • API 5L → Grades A25, A, B, X42, X46, X52, X56, X60, X65, X70, X80

  • API 5CT → Grades H40, J55, K55, N80, L80, C90, T95, P110, Q125

EN / DIN

  • EN 10216-1 → Grades P195TR1, P195TR2, P235TR1, P235TR2, P265TR1, P265TR2

  • EN 10216-2 → Grades P235GH, P265GH, 16Mo3, 13CrMo4-5, 10CrMo9-10

  • DIN 1629 → Grades St 37.0, St 44.0, St 52.0

  • DIN 17175 → Grades St35.8, St45.8, 15Mo3, 13CrMo44

BS (British Standards)

  • BS 3059 Part 1 → Grades 320, 360

  • BS 3059 Part 2 → Grades 243, 360, 440

  • BS 3602 → Grades like 360, 410 (for pressure purposes)

JIS (Japanese Standards)

  • JIS G3454 → Grades STPG 370, STPG 410

  • JIS G3455 → Grades STS 370, STS 410

  • JIS G3456 → Grades STPT 370, STPT 410, STPT 480

Stainless Steel Seamless Tubing Standards & Grades

ASTM / ASME (American Standards)

  • ASTM A213 / ASME SA213 → Seamless Austenitic & Ferritic Stainless Steel Tubes for Boilers, Superheaters & Heat Exchangers

    • Grades: TP304, TP304H, TP304L, TP316, TP316H, TP316L, TP317, TP321, TP321H, TP347, TP347H, TP310S, TP904L

  • ASTM A269 / ASME SA269 → Seamless & Welded Austenitic Stainless Steel Tubes for General Service

    • Grades: TP304, TP304L, TP316, TP316L, TP321, TP347

  • ASTM A312 / ASME SA312 → Seamless Austenitic Stainless Steel Pipes (often used for larger-diameter tubing as well)

    • Grades: TP304, TP304L, TP316, TP316L, TP321, TP347, TP310S, TP904L, Duplex Grades

  • ASTM A249 / ASME SA249 → Welded Austenitic Stainless Steel Tubes (but also often referenced alongside seamless for interchange)

  • ASTM A269 / A213 → Cold-Drawn Seamless Tubes for High Precision Applications

EN / DIN (European Standards)

  • EN 10216-5 → Seamless Stainless Steel Tubes for Pressure Purposes

    • Grades: 1.4301 (304), 1.4306 (304L), 1.4541 (321), 1.4401 (316), 1.4404 (316L), 1.4571 (316Ti), 1.4438 (317L), 1.4539 (904L)

  • DIN 17456 / 17458 → Seamless Austenitic Stainless Steel Tubes for General & Pressure Service

    • Grades: X5CrNi18-10 (304), X2CrNi19-11 (304L), X5CrNiMo17-12-2 (316), X2CrNiMo17-12-2 (316L), X6CrNiTi18-10 (321), X6CrNiNb18-10 (347)

BS (British Standards)

  • BS EN 10216-5 (aligned with EN) – Seamless Stainless Steel Tubes for Pressure

  • BS 3605 → Austenitic Stainless Steel Pipes & Tubes for Pressure & General Purposes

    • Grades: 304, 304L, 316, 316L, 321, 347

JIS (Japanese Standards)

  • JIS G3459 → Stainless Steel Pipes for General Service

    • Grades: SUS304, SUS304L, SUS316, SUS316L, SUS321, SUS347

  • JIS G3463 → Stainless Steel Boiler & Heat Exchanger Tubes

    • Grades: SUS304, SUS304L, SUS316, SUS316L, SUS321, SUS347, SUS310S

Special Grades (High Performance)

  • Duplex & Super Duplex Stainless Steel → UNS S31803 (2205), S32205, S32750, S32760

  • Nickel Alloys / Special Grades (sometimes classified alongside stainless seamless tubing) → Alloy 20, 904L, Hastelloy grades

Alloy Steel Seamless Tubing – Standards & Grades

ASTM / ASME (American Standards)

  • ASTM A213 / ASME SA213 – Seamless Ferritic & Austenitic Alloy Steel Tubes for Boilers, Superheaters, and Heat Exchangers

    • Grades: T2, T5, T9, T11, T12, T22, T23, T24, T91, T92, T122, T911

  • ASTM A335 / ASME SA335 – Seamless Ferritic Alloy Steel Pipes (often supplied as tubing for high-temperature service)

    • Grades: P1, P2, P5, P9, P11, P12, P22, P23, P24, P91, P92, P122, P911

  • ASTM A209 / ASME SA209 – Seamless Carbon-Molybdenum Alloy Steel Boiler & Superheater Tubes

    • Grades: T1, T1a, T1b

  • ASTM A369 / ASME SA369 – Seamless Ferritic Alloy Steel Pipe for High-Temperature Service

    • Grades: FW, FP1, FP2, FP5, FP9, FP11, FP12, FP22, FP91

EN / DIN (European Standards)

  • EN 10216-2 – Seamless Tubes for Pressure Purposes, Non-Alloy & Alloy Steels with Specified Elevated Temperature Properties

    • Grades: 10CrMo9-10, 13CrMo4-5, 14MoV6-3, X11CrMo5, X10CrMoVNb9-1 (P91), X10CrWMoVNb9-2 (P92)

  • DIN 17175 – Seamless Tubes of Heat-Resistant Steels

    • Grades: 15Mo3, 13CrMo44, 10CrMo910, X20CrMoV121

BS (British Standards)

  • BS 3059 Part 2 – Alloy Steel Tubes for Boiler & Heat Exchanger Service

    • Grades: 360, 440 (with alloying elements)

  • BS 3604 – Alloy Steel Seamless Tubes for Pressure Purposes

    • Grades: Equivalent to ASTM P & T series

JIS (Japanese Standards)

  • JIS G3462 – Alloy Steel Tubes for Boiler and Heat Exchanger Service

    • Grades: STBA 12, STBA 20, STBA 22, STBA 23, STBA 24, STBA 25

  • JIS G3458 – Alloy Steel Pipes for High-Temperature Service

    • Grades: STS 370, STS 410, STS 480, STS 530 (with Cr-Mo alloy content)

Advantages of Seamless Steel Tubes

  1. Superior Strength – Without weak points such as weld seams, seamless tubes can withstand higher pressures.

  2. Excellent Dimensional Accuracy – Produced with precision, these tubes provide tight tolerances required in critical industries.

  3. Corrosion Resistance – High-quality alloys and steel grades ensure resistance to rust, scaling, and chemical attack.

  4. Versatility – Available in various grades, sizes, and finishes suitable for multiple industrial applications.

  5. Cost Efficiency – Longer life span and reduced maintenance costs make seamless tubes a reliable investment.

Manufacturing Process of Seamless Steel Tube 

Emirerri Steel follows advanced technology and strict quality checks at every stage of manufacturing seamless tubes:

  1. Billet Preparation – Premium-grade steel billets are selected and heated to the required temperature.

  2. Piercing – A rotary piercing process creates a hollow shell from the heated billet.

  3. Elongation – The hollow shell is elongated using rolling mills to achieve desired dimensions.

  4. Sizing & Finishing – Tubes are further processed for accuracy in thickness and diameter.

  5. Heat Treatment – Enhances mechanical properties, toughness, and corrosion resistance.

  6. Testing & Inspection – Non-destructive tests (NDT), hydrostatic tests, and visual inspections guarantee quality.

Applications of Seamless Steel Tubes

Seamless steel tubes are essential across numerous industries due to their reliability and ability to withstand extreme conditions:

  • Oil & Gas Industry – Used in drilling, casing, tubing, and pipeline transportation.

  • Power Generation – Boilers, heat exchangers, and superheater tubes.

  • Automobile Industry – Shock absorbers, drive shafts, and structural parts.

  • Petrochemical & Refineries – For transporting chemicals, gases, and fluids.

  • Construction & Infrastructure – Scaffolding, structural supports, and precision engineering.

  • Aerospace & Defense – High-performance applications requiring strength and reliability.

Export & Global Reach

Emirerri Steel is a recognized exporter of seamless steel tubes, supplying to clients in Tunisia, North Africa, Middle East, Europe, USA, South America, and Asia. We understand global market requirements and offer competitive pricing, timely delivery, and proper documentation for smooth transactions.

Our seamless tubes are trusted by leading EPC contractors, oil companies, power plants, and engineering firms worldwide.

Conclusion

Seamless Steel Tubes by Emirerri Steel are designed to deliver unmatched strength, durability, and performance across diverse industries. With our modern infrastructure, technical expertise, and commitment to excellence, we ensure that our clients receive world-class seamless tubes tailored to their needs.

Whether your requirement is for high-pressure boiler tubes, precision stainless steel tubing, or customized alloy tubes, Emirerri Steel is your reliable partner.

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