Carbon, Stainless & Alloy Steel Pipes

Tubineu supplies seamless and welded steel pipes for process piping, utility systems, transmission lines, and pressure service where dimensional control, material conformity, and traceability are essential. The range typically includes carbon steel, stainless steel, duplex stainless steel, and alloy steel pipes in SEAMLESS, ERW, EFW, and other welded forms depending on size, grade, and service conditions. Pipes are supplied to recognized material and dimensional standards with project-specific scope for wall thickness, end preparation, heat treatment, inspection, testing, marking, and certification.

Pipe Types, Dimensions & Standards

Steel pipes are pressure-retaining tubular products used to convey liquids, gases, steam, and process media in industrial piping systems. Dimensional requirements for carbon steel and alloy steel pipes are generally specified to ASME B36.10 for welded and seamless wrought steel pipe, while stainless steel pipe dimensions are typically specified to ASME B36.19. Pipes are designated by nominal pipe size and schedule, with the outside diameter fixed for a given size and the wall thickness varying by schedule. Common schedules include 5, 10, 20, 40, 80, 160, and XXS, selected according to design pressure, corrosion allowance, temperature, and mechanical loading. End preparations may include plain end, bevel end, threaded end, and coupled end depending on the joining method and service requirements.

Carbon Steel Pipes

Carbon steel pipes are widely used for general pressure piping, high-temperature service, low-temperature service, structural duty, and utility systems where strength, weldability, and cost efficiency are important. Seamless carbon steel pipe is commonly selected for higher-pressure and higher-temperature applications, while welded forms are used extensively for general service, water lines, mechanical systems, and larger diameter piping where project economics and availability are key considerations. Material selection is generally based on operating temperature, pressure, toughness requirements, corrosion allowance, coating system, and code compliance.

Size:

1/2" through 48"

Schedule Range:

STD, 40, XH, XS, 60, 80, 100, 120, 140, 160, XXH, XXS

Common material specifications: 

ASTM A106 Gr. B/C 

For seamless carbon steel pipe in high-temperature service

ASTM A53 Gr. A/B 

For welded and seamless general-purpose pipe

ASTM A333 Gr. 6 

For seamless and welded pipe in low-temperature service requiring impact toughness

API 5L Grade B, X42, X46, X52, X56, X60, X65, X70

Manufacturing forms: 

Seamless (SMLS) for critical pressure service 

Welded forms such as ERW for general piping and selected transmission applications

depending on size, wall thickness, and project specification

Dimensional standards and sizes: 

ASME B36.10 for nominal pipe sizes and schedules used in carbon steel piping systems, with common schedules including 40, STD, 80, XS, 160, and XXS according to pressure and mechanical requirements

Inspection and testing: 

Visual and dimensional inspection

Hydrostatic or non-destructive electric testing as applicable to the product specification

Tensile and Flattening tests 

Chemical and mechanical verification

and optional PMI, UT, impact testing, hardness testing, and third-party witness inspection as required

Typical service:

Oil and gas facilities

Refineries

Petrochemical piping

Power plants

Steam distribution

Utility plants

Structural and mechanical 

Water and firewater systems,

Low-temperature process piping when supplied to the appropriate grade

Carbon Steel Seamless Tubes

Common material specifications:

ASTM A/ASME SA 210 GR. A-1

ASTM A/ASME SA 179

For seamless cold-drawn low-carbon steel heat exchanger and condenser tubes

Stainless Steel Pipes

Stainless steel pipes are selected for corrosive service, hygienic systems, and process conditions where oxidation resistance, cleanability, and metallurgical stability are required. Austenitic grades are widely used for general chemical and utility duty, while duplex stainless steels are preferred where improved chloride resistance and higher strength are needed. Seamless and welded stainless steel pipe selection is typically based on pressure class, corrosion environment, fabrication method, product cleanliness, and any post-weld heat treatment or corrosion testing requirements.

Size:

1/2" through 48"

Schedule Range:

5s,10s,STD, 40s, XH, XS, 60s, 80s, 100s, 120s, 140s, 160s, XXH, XXS

Common material specifications: 

ASTM / ASME A312 TP304 / 304L

ASTM / ASME A312 TP316 / 316L

ASTM / ASME A312 TP321 / 321H

ASTM / ASME A312 TP347 / 347H

For seamless and welded austenitic stainless steel pipe

ASTM A358

ASTM A778

For electric-fusion-welded austenitic stainless steel pipe

ASTM A790 UNS S31803

ASTM A790 UNS S32205

ASTM A790 UNS S32750

ASTM A790 UNS S32760

For duplex and super duplex stainless steel pipe

Manufacturing forms: 

Seamless pipe for critical or smaller bore service

Welded pipe for general process duty

EFW pipe for larger diameters or heavier wall requirements depending on the project specification and inspection class

Dimensional standards and sizes: 

ASME B36.19 

For stainless steel pipe dimensions with common schedules including 5S, 10S, 40S, and 80S

While selected sizes and heavy walls may also be coordinated with ASME B36.10 where permitted by the governing specification

Inspection and testing: 

Visual and dimensional inspection

Hydrostatic or non-destructive electric testing

Tensile and Flattening tests

Chemical and mechanical verification

Heat-treatment verification

and optional PMI, ferrite control, intergranular corrosion testing, dye penetrant testing, UT, and internal surface finish requirements where specified

Typical service:

Chemical processing 

Offshore and Marine service

Food and beverage systems

Pharmaceuticals

Water treatment

Desalination

General corrosive service

Chloride-bearing applications requiring improved corrosion resistance.

Available Options

Manufacturing options: 

SEAMLESS, ERW, EFW, and other welded forms subject to product specification, size range, and end-use requirements

Size and wall thickness range: 

Nominal pipe sizes and schedules to ASME B36.10 and ASME B36.19, including light wall, standard wall, extra strong, and heavy-wall pipe depending on grade and manufacturing route.

End preparation: 

Plain end, bevel end, threaded end, coupled end, cut-to-length, and project-specific preparation for field welding or mechanical joining.

Testing and NDE options: 

Hydrotest, nondestructive electric test, UT, PMI, hardness testing, impact testing, ferrite testing, surface examination, dimensional verification, and third-party inspection in accordance with code and purchaser requirements.

Supply condition and traceability: 

Heat treatment to the governing material specification, stencil marking, heat number traceability, colour coding where applicable, and material test certificates to EN 10204 3.1 or equivalent documentation on request.

Project support: 

Technical review of pipe specifications, inspection coordination, export packing, matching fittings and flanges support, and documentation packs aligned with EPC and end-user requirements.

Looking for the right steel pipe solution for your next project? Tubineu is ready to support your requirements with technical guidance, responsive quotations, and dependable supply across carbon steel, stainless steel, and alloy steel seamless and welded pipes. Send us your specifications to receive fast assistance from our team.