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Help CenterGB/T 3087 Seamless Steel Tube for Low & Medium Pressure Boiler Grades 10#, 20# Current Standard: GB/T 3087-2022
Product Spotlights
Working Pressure ≤5.88MPa | Working Temperature ≤450°C
Grades 10#, 20#
Current Standard: GB/T 3087-2022
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GB/T 3087 Seamless Steel Tube for Low & Medium Pressure Boiler
Working Pressure ≤5.88MPa | Working Temperature ≤450°C
Grades 10#, 20#
Current Standard: GB/T 3087-2022
Product Overview
GB/T 3087 is the Chinese national standard for seamless steel tubes used in low and medium pressure boilers. These tubes are manufactured from high-quality carbon structural steel (10# and 20#) and are suitable for service where working pressures do not exceed 5.88MPa and operating temperatures are below 450°C.
Our GB/T 3087 low and medium pressure boiler tubes are manufactured by hot rolling or cold drawing processes and are delivered in as-rolled or normalized condition. They are the most economical choice for industrial boiler applications.
Key Applications:
Low and medium pressure boiler water walls
Steam generation tubes
Economizer tubes
Locomotive boiler tubes (superheater tubes, flue tubes, stay tubes)
Industrial and utility boiler systems
✅ GB/T 3087-2022 compliant – Current standard (effective November 1, 2022)
✅ Low and medium pressure service – Working pressure ≤5.88MPa
✅ Economical – Cost-effective carbon steel material
✅ Seamless construction – Hot rolled or cold drawn
✅ 100% hydrostatic tested – Guaranteed pressure integrity
✅ EN 10204 Type 3.1 MTC provided with full traceability
✅ Factory direct | Global shipping
Key Specifications
| Parameter | Details |
|---|---|
| Standard | GB/T 3087-2022 (supersedes GB/T 3087-2008) |
| Product Type | Seamless Steel Tube for Low & Medium Pressure Boiler |
| Steel Grades | 10#, 20# |
| OD Range | 10mm – 426mm |
| Wall Thickness | 1.5mm – 26mm |
| Length | 4m – 12m (fixed or random) |
| Delivery Condition | As-rolled (hot rolled) / Heat treated (cold drawn) |
| Surface Finish | Black / Bare / Oiled |
| End Finish | Plain / Beveled / Threaded |
Grade Overview – GB/T 3087
| Grade | Carbon Content | Tensile (MPa) | Yield (MPa) | Elongation (%) | Application |
|---|---|---|---|---|---|
| 10# | 0.07-0.14 | 335-475 | ≥205 | ≥24 | Low pressure boiler, general service |
| 20# | 0.17-0.23 | 410-550 | ≥245 | ≥20 | Most popular – standard boiler service |
💡 20# is the most popular grade – widely used for low and medium pressure boiler applications due to its excellent balance of strength and ductility.
Chemical Composition – GB/T 3087
| Grade | C (%) | Si (%) | Mn (%) | P max (%) | S max (%) |
|---|---|---|---|---|---|
| 10# | 0.07-0.14 | 0.17-0.37 | 0.35-0.65 | 0.030 | 0.030 |
| 20# | 0.17-0.23 | 0.17-0.37 | 0.35-0.65 | 0.030 | 0.030 |
💡 Low phosphorus and sulfur (≤0.030%) ensures good toughness and weldability for boiler applications.
Mechanical Properties – GB/T 3087
| Grade | Tensile Strength (MPa) | Yield Strength (MPa) min | Elongation (%) min | |
|---|---|---|---|---|
| ≤16mm | >16mm | |||
| 10# | 335-475 | ≥205 | ≥195 | ≥24 |
| 20# | 410-550 | ≥245 | ≥235 | ≥20 |
💡 20# offers excellent strength (410-550 MPa) with good ductility (≥20% elongation) – the workhorse grade for low and medium pressure boilers.
Available Sizes – GB/T 3087
Hot Rolled Tubes:
| OD (mm) | WT Range (mm) | Typical Grade | Application |
|---|---|---|---|
| 22 – 60 | 2.0 – 8.0 | 20# | Small boiler tubes |
| 60 – 114 | 3.0 – 12.0 | 20# | General boiler components |
| 114 – 219 | 4.0 – 16.0 | 20# | Main boiler tubes – most common |
| 219 – 273 | 5.0 – 20.0 | 20# | Large boiler components |
| 273 – 426 | 6.0 – 26.0 | 20# | Headers, large tubes |
Cold Drawn Tubes:
| OD (mm) | WT Range (mm) | Typical Grade | Application |
|---|---|---|---|
| 6 – 25 | 1.5 – 4.0 | 20#, 10# | Small diameter tubes |
| 25 – 50 | 2.0 – 6.0 | 20# | Precision tubes |
| 50 – 76 | 2.5 – 10.0 | 20# | Superheater elements |
GB/T 3087 vs GB/T 5310 – Quick Comparison
| Feature | GB/T 3087 | GB/T 5310 |
|---|---|---|
| Application | Low & medium pressure boilers | High pressure boilers |
| Working Pressure | ≤5.88MPa | ≥9.8MPa |
| Max Temperature | ≤450°C | Up to 650°C |
| Steel Grades | 10#, 20# | 20G, 15CrMoG, 12Cr1MoVG |
| Alloy Content | Carbon steel only | Carbon + Cr-Mo alloys |
| Cost | Lower | Higher |
💡 Choose GB/T 3087 for low and medium pressure boiler applications (≤5.88MPa) – more economical and sufficient for these service conditions.
Quality Assurance & Testing
| Test | Method | Coverage | Requirement |
|---|---|---|---|
| Hydrostatic Test | Water pressure | 100% | Mandatory |
| Tensile Test | EN ISO 6892-1 | Per lot | All grades |
| Flattening Test | Ductility | Per lot | All grades |
| Flaring Test | Tube end expansion | Per lot | All grades |
| Dimensional Inspection | Micrometer | 100% | All grades |
Why Choose Our GB/T 3087 Boiler Tubes?
| Advantage | Description |
|---|---|
| Current standard | GB/T 3087-2022 compliant |
| 20# in stock | Most popular grade – ready to ship |
| 100% hydrostatic tested | Mandatory per standard – guaranteed integrity |
| Expansion tested | Flattening and flaring tests ensure formability |
| Good weldability | Low carbon equivalent – easy field welding |
| Competitive pricing | Factory direct – lower cost than high pressure grade |
| Full traceability | EN 10204 3.1 MTC with heat number |
| Global export | Shipped to boiler manufacturers worldwide |
Contact for Quote
Please provide the following details:
Grade : 10# / 20#
OD (mm) : _______
WT (mm) : _______
Length (m) : _______
Quantity : _______ (pieces / meters / tons)
Manufacturing : Hot rolled / Cold drawn
Application : Industrial boiler / Locomotive boiler / Economizer / Other _______
Service Temperature : _______ °C
Inspection : Standard / Third-party (SGS/BV/TUV)
📧 Email: yjhtrade@gmail.com
📞 WhatsApp: +86 15106174543
🌐 Website: /
Reply within 24 hours.
FAQ – GB/T 3087
Q1: What is the current version of GB/T 3087?
A: GB/T 3087-2022 (effective November 1, 2022), superseding GB/T 3087-2008.
Q2: What is the most popular grade in GB/T 3087?
A: 20# – carbon steel grade with 410-550 MPa tensile strength, ≥245 MPa yield.
Q3: What is the difference between GB/T 3087 and GB/T 5310?
A: GB/T 3087 – low and medium pressure (≤5.88MPa), carbon steel only (10#, 20#). GB/T 5310 – high pressure (≥9.8MPa), includes alloy steel grades (20G, 15CrMoG, 12Cr1MoVG).
Q4: What is the maximum temperature for GB/T 3087 tubes?
A: Approximately 450°C – for higher temperatures, use GB/T 5310 alloy grades.
Q5: Does GB/T 3087 require hydrostatic testing?
A: Yes – 100% hydrostatic testing is mandatory for all tubes.
Q6: Do you provide third-party inspection?
A: Yes. SGS, BV, TUV, or any customer-specified agency.
Q7: Do you offer free samples?
A: 30cm sample of 20# available. Shipping fee applies.
Related Products
GB/T 3087 – Low & medium pressure boiler tubes (this product)
GB/T 5310 – High pressure boiler tubes
GB/T 8163 – Fluid transport tubes
ASTM A179 – Heat exchanger tubes
ASTM A192 – High pressure boiler tubes (US standard)
Tags: GB/T 3087 Low Pressure Boiler Tube Medium Pressure Boiler Tube 20# Boiler Tube Seamless Boiler Tube Chinese Standard Industrial Boiler
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