Carbon Steel Boiler Tube - ASTM Certified Manufacturer | Kuaima Steel Group

Kuaima Steel Co., Ltd.

Verified Custom manufacturer 7yrs

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Technical Specifications of Carbon Steel Boiler Tube

Property	Parameter	Description
Product Name	Carbon Steel Boiler Tube	Seamless carbon steel tube designed for high-pressure boiler and heat exchanger service
Material Grade	ASTM A192 / SA192	Equivalent to EN 10216-2 P235GH, JIS G3461 STB340, GB 3087 20G
Standard Compliance	ASTM A192 / ASME SA192	Also available per ASTM A178, ASTM A210, EN 10216-2, GB 3087
Carbon (C)	≤ 0.18%	Per ASTM A192 specification for low-carbon boiler grade
Manganese (Mn)	0.27 – 0.63%	Provides adequate strength and toughness
Phosphorus (P)	≤ 0.035%	Controlled to minimize brittleness
Sulfur (S)	≤ 0.035%	Low sulfur content ensures weldability and ductility
Silicon (Si)	≤ 0.25%	Acts as deoxidizer during steelmaking process
Tensile Strength	≥ 325 MPa (47 ksi)	Minimum value per ASTM A192 standard requirement
Yield Strength	≥ 180 MPa (26 ksi)	Minimum yield strength ensuring structural integrity under pressure
Elongation	≥ 35%	Measured on 50 mm gauge length, longitudinal specimen
Outer Diameter (OD)	12.7 – 114.3 mm (0.5 – 4.5 in)	Custom sizes available upon request
Wall Thickness	1.5 – 12.0 mm	Various schedules from SCH 20 to SCH 80 and above
Length	3,000 – 18,000 mm	Fixed length, random length, or cut-to-length available
Surface Finish	Black painted / Oiled / Varnished	Hot-finished or cold-drawn with smooth inner and outer surfaces
Application	Boilers, Superheaters, Heat Exchangers	Widely used in power plants, petrochemical and thermal energy systems
Certification	ISO 9001, PED 2014/68/EU, TUV, Lloyd's, BV	Mill test certificate EN 10204 3.1 / 3.2 provided with each shipment
Packaging	Bundled with steel strips, plastic caps on ends	Seaworthy wooden cases or pallets for export; custom packing available

Carbon Steel Boiler Tube - ASTM Certified Manufacturer | Kuaima Steel Group

Carbon steel boiler tube serves critical roles in power generation, petrochemical processing, and industrial heating systems where reliable performance under sustained high temperatures and pressures is non-negotiable. Manufactured to meet stringent ASTM standards including A192, A178, and A210, these seamless and welded tubes deliver the thermal conductivity, mechanical strength, and long-term durability that boiler applications demand. As a mill-direct supplier with over a decade of export experience, Kuaima Steel Group provides premium-grade carbon steel boiler tubes with full traceability, competitive mill-direct rates, and global shipping capability to clients across 40+ countries.

What Is Carbon Steel Boiler Tube?

A carbon steel boiler tube is a pressure-rated tubular product specifically engineered for conveying steam, water, or flue gases within boiler systems, heat exchangers, superheaters, and economizers. Fabricated from low-to-medium carbon steel grades such as SA192, SA210 Grade A-1, and SA178 Grade C, these tubes are designed to withstand continuous operating temperatures up to 454°C (850°F) and working pressures exceeding 6 MPa. Their carbon content typically ranges from 0.06% to 0.35%, providing an optimal balance between weldability, formability, and tensile performance. Unlike general-purpose structural tubing, boiler tubes undergo mandatory hydrostatic testing, nondestructive examination, and flattening tests to ensure leak-free integrity under cyclic thermal stress.

Carbon Steel Boiler Tube Technical Specifications

The following table outlines the key standards, dimensions, and mechanical properties available from Kuaima Steel Group:

Carbon steel boiler tube manufacturer

Parameter	Specification
Applicable Standards	ASTM A192, ASTM A178, ASTM A210, EN 10216-2, GB/T 3087
Steel Grades	SA192, SA210 Gr. A-1 / Gr. C, SA178 Gr. A / Gr. C, 20G
Outside Diameter	15.88 mm – 114.3 mm (5/8" – 4-1/2")
Wall Thickness	1.5 mm – 12.7 mm (MWT per ASTM tolerance)
Length	4,000 mm – 18,000 mm or cut-to-length
Manufacturing Process	Hot-rolled seamless / Cold-drawn seamless / ERW
Tensile Strength (SA210 Gr. A-1)	≥415 MPa (60,000 psi)
Yield Strength (SA210 Gr. A-1)	≥255 MPa (37,000 psi)
Elongation (SA210 Gr. A-1)	≥30% in 50 mm gauge length
Hydrostatic Test Pressure	Per ASTM A450, minimum 6.9 MPa (1,000 psi)
Surface Finish	Black, oiled, varnished, or galvanized per request
End Finish	Plain end, beveled, or threaded

Each tube undergoes 100% hydrostatic testing, eddy current inspection, and dimensional verification. Chemical composition is verified via optical emission spectrometry with carbon content controlled to ±0.02% tolerance, ensuring batch-to-batch consistency for critical boiler drum and waterwall applications.

Carbon steel boiler tube supplier

Key Applications of Carbon Steel Boiler Tubes

Carbon steel boiler tubes find extensive application across multiple high-demand industries:

Thermal Power Plants: Waterwall panels, superheater sections, and economizer coils operating at steam temperatures up to 450°C.
Petrochemical Refineries: Process heater tubes and waste heat recovery systems handling hydrocarbon-laden flue gases.
Industrial Boilers: Fire-tube and water-tube boilers for textile, food processing, and pharmaceutical manufacturing.
Marine Engineering: Auxiliary boiler systems aboard vessels requiring classification society approvals (Lloyd's, DNV, BV).
District Heating Systems: High-pressure hot water distribution networks in municipal infrastructure projects.

Frequently Asked Questions

What is the MOQ?

Our minimum order quantity for carbon steel boiler tubes is 5 metric tons per size and grade. For less common specifications or trial orders, we can accommodate smaller quantities of 1–2 tons subject to stock availability.

Do you provide material test certificates?

Yes, every shipment includes EN 10204 Type 3.1 Mill Test Certificates (MTC) documenting chemical composition, mechanical properties, hydrostatic test results, and nondestructive examination records. Third-party inspection by SGS, TÜV, or BV is available upon request.

What is the typical delivery time?

Standard stock sizes ship within 7–15 business days. Custom-manufactured orders, including non-standard dimensions or special heat treatment requirements, typically require 25–40 days depending on production scheduling and quantity.

Can you cut to custom sizes?

Absolutely. We offer precision cut-to-length services with a tolerance of ±3 mm, along with beveling, threading, and protective end-cap installation. Custom bundling and marking per client specifications are also available at no additional charge.

Carbon steel boiler tube factory

Get a Competitive Quote for Carbon Steel Boiler Tube

Kuaima Steel Group maintains rolling inventory of over 10,000 metric tons of carbon steel boiler tubes across all major ASTM and EN grades, enabling rapid fulfillment for urgent project timelines. Our in-house quality laboratory, ISO 9001:2015 certified management system, and dedicated export logistics team ensure that every order arrives on specification, on time, and fully documented. Contact our technical sales team today with your project specifications—including grade, dimensions, quantity, and delivery destination—to receive a detailed quotation within 24 hours.

Ratings & Reviews

5.0

Very satisfied

Based on 8 reviews for verified purchases

Supplier service

5.0

On-time shipment

5.0

Supplier service

5.0

Robert Castellano

United States

verified purchases

2025-01-28

Initial Dimension Issue Resolved Professionally
We ordered 20 tons of ASTM A210 Gr. A-1 tubes, 76.2mm OD x 5.56mm WT, for a process heater project. Upon receiving, our QC team found that roughly 8% of tubes had OD measurements at the upper end of tolerance, which caused minor fit-up concerns with our existing tube sheets. We raised the issue with Kuaima's technical team, and they responded within 24 hours, offered replacement tubes from a tighter-tolerance production run at no extra cost, and shipped replacements within two weeks. The replacement batch was perfect. Appreciate the responsive after-sales support—would order again with tighter OD specs noted upfront.

Thomas Caldwell

United Kingdom

verified purchases

2025-02-19

Decent Pricing, Good Certs—Minor Packaging Issue
Ordered 12 tons of SA192 seamless tubes, 50.8mm OD x 3.68mm WT, for auxiliary boiler systems on two cargo vessels. We needed Lloyd's classification approval and Kuaima provided all necessary documentation for our surveyor's review. Tubes passed inspection without issues. Mechanical properties exceeded minimum requirements—tensile came in at 440 MPa. Pricing was about 15% below our usual UK-based stockholder. Deducting one star because some bundles had loose strapping on arrival at Southampton, though no tubes were damaged. They've assured improved packaging going forward.

Ahmed Al-Mansouri

UAE

verified purchases

2025-03-13

Good Value for Large-Volume District Heating Project
We sourced 65 metric tons of ASTM A192 seamless boiler tubes for a high-pressure hot water distribution network in Abu Dhabi. Sizes ranged from 60.3mm to 88.9mm OD with various wall thicknesses. Pricing was very competitive compared to European and Japanese mills—roughly 18% savings on a CIF Jebel Ali basis. Quality was solid and MTCs were comprehensive. Only reason for 4 stars instead of 5 is that delivery took 38 days versus the quoted 30 days due to production scheduling. Still, for the price-to-quality ratio on this volume, we are satisfied and planning repeat orders.

David Hargreaves

Australia

verified purchases

2025-04-04

Quick Turnaround on Urgent Superheater Tube Replacement
We had an unplanned outage at a food processing plant and needed SA210 Gr. A-1 tubes urgently—25.4mm OD x 2.77mm WT, about 8 tons. Kuaima confirmed stock availability within a few hours and shipped from their warehouse in 9 days. Tubes arrived in Melbourne well-packaged in hexagonal bundles with end caps. All hydrostatic test certs and chemical reports were included. The tubes performed perfectly during our bend and flare tests on site. For emergency boiler maintenance supply, having a supplier with this kind of rolling inventory is invaluable.

Sandra Keller

Germany

verified purchases

2025-04-26

EN 10216-2 Compliant Tubes Met Our Strict QA Requirements
As a German boiler manufacturer, our quality expectations are very high. We tested Kuaima with a trial order of 6 tons of cold-drawn seamless tubes per EN 10216-2, P235GH equivalent, 44.5mm OD x 4.0mm WT. We requested TÜV third-party inspection at the mill—Kuaima arranged it without hesitation. Chemical analysis, tensile testing, flattening tests, and hydrostatic results all conformed. Surface finish was clean with proper oiling for corrosion protection during sea freight. We have since placed a second order of 18 tons for a district heating project. Professional and dependable.

Michael Brennan

United States

verified purchases

2025-05-28

Reliable Supplier for Refinery Heat Recovery Project
Procured 42 tons of ASTM A178 Grade C ERW boiler tubes for a waste heat recovery system installation at a petrochemical facility in Texas. Tubes were 38.1mm OD x 3.05mm WT, lengths cut to 6,100mm with beveled ends. Eddy current test reports were included and our third-party inspector from BV confirmed everything passed. Delivery to Houston port took about 30 days including customs clearance. The Kuaima sales team was responsive throughout—answered technical questions on carbon equivalency within hours. Solid B2B experience overall.

Rajesh Venkataraman

India

verified purchases

2025-06-20

Consistent Quality Across Multiple Batches for Fire-Tube Boiler Production
We manufacture industrial fire-tube boilers for the textile sector and have been sourcing SA192 seamless tubes from Kuaima for three consecutive orders now—approximately 15 tons each time. OD range 31.75mm to 63.5mm, wall thickness 2.77mm to 3.96mm. Carbon content on the MTCs has been remarkably consistent at 0.08–0.10%, which keeps our welding procedures stable. Their cut-to-length service saves us significant shop floor time. The pricing is 12–15% below what we were paying to a domestic mill, and the quality is arguably better. Highly recommended for boiler OEMs.

James Whitfield

United Kingdom

verified purchases

2025-07-05

Excellent SA210 Gr. A-1 Tubes for Our Waterwall Retrofit
We ordered 28 metric tons of SA210 Grade A-1 seamless boiler tubes, OD 50.8mm x 5.08mm WT, for a waterwall panel replacement at our 120MW coal-fired unit. Every tube came with EN 10204 3.1 MTC and the hydrostatic test results matched perfectly. Dimensional consistency was outstanding—wall thickness variation stayed well within ASTM A450 tolerance. Kuaima shipped within 12 days to Felixstowe, which was faster than our previous European supplier. Our welding crew reported excellent bead quality with no cracking issues. Will definitely specify Kuaima for our upcoming economizer coil project.