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Help CenterGB/T 5310 Seamless Steel Tube for High Pressure Boiler Grades 20G, 15CrMoG, 12Cr1MoVG, 12Cr2MoG
Product Spotlights
Working Pressure ≥9.8MPa | Working Temperature Up to 650°C
Grades 20G, 15CrMoG, 12Cr1MoVG, 12Cr2MoG
Current Standard: GB/T 5310-2023
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GB/T 5310 Seamless Steel Tube for High Pressure Boiler
Working Pressure ≥9.8MPa | Working Temperature Up to 650°C
Grades 20G, 15CrMoG, 12Cr1MoVG, 12Cr2MoG
Current Standard: GB/T 5310-2023
Product Overview
GB/T 5310 is the Chinese national standard for seamless steel tubes used in high pressure boilers and high temperature pressure equipment. These tubes are specifically designed for service where working pressures exceed 9.8MPa and operating temperatures reach 450°C to 650°C.
Our GB/T 5310 high pressure boiler tubes are manufactured by hot rolling, cold drawing, or hot expansion processes and undergo strict heat treatment (normalized or normalized + tempered) to ensure optimal microstructure and mechanical properties for high temperature service.
Key Applications:
Superheater tubes
Reheater tubes
Economizer tubes
Water wall tubes
Boiler headers and main steam pipelines
✅ GB/T 5310-2023 compliant – Current standard (effective April 1, 2024)
✅ High pressure capability – Working pressure ≥9.8MPa
✅ High temperature service – Up to 650°C with alloy grades
✅ Seamless construction – Hot rolled, cold drawn, or hot expanded
✅ Heat treated – Normalized or normalized + tempered
✅ 100% hydrostatic and NDT tested – Guaranteed integrity
✅ EN 10204 Type 3.1 MTC provided with full traceability
✅ Factory direct | Global shipping
Key Specifications
| Parameter | Details |
|---|---|
| Standard | GB/T 5310-2023 (supersedes GB/T 5310-2017) |
| Product Type | Seamless Steel Tube for High Pressure Boiler |
| Grades | 20G, 20MnG, 25MnG, 15MoG, 20MoG, 15CrMoG, 12Cr2MoG, 12Cr1MoVG |
| Hot Rolled OD | 22mm – 530mm |
| Cold Drawn OD | 10mm – 108mm |
| Wall Thickness | 2.0mm – 70mm |
| Length | 4m – 12m (fixed or random) |
| Delivery Condition | Normalized / Normalized + Tempered |
| Surface Finish | Black / Bare / Oiled |
| End Finish | Plain / Beveled |
Grade Overview – GB/T 5310
| Grade | Type | Max Temp (°C) | Tensile (MPa) | Yield (MPa) | Elongation (%) | Application |
|---|---|---|---|---|---|---|
| 20G | Carbon steel | 450 | 410-550 | ≥245 | ≥24 | Most popular – water wall, economizer, low temp superheater |
| 20MnG | Carbon steel (Mn) | 450 | ≥415 | ≥240 | ≥22 | Higher strength carbon steel |
| 25MnG | Carbon steel (Mn) | 450 | ≥485 | ≥275 | ≥20 | High strength carbon steel |
| 15MoG | Mo-alloy | 500 | 450-600 | ≥270 | ≥22 | Medium temperature service |
| 15CrMoG | 1Cr-0.5Mo | 550 | 440-640 | ≥235 | ≥21 | High temperature superheater |
| 12Cr2MoG | 2.25Cr-1Mo | 550 | 450-600 | ≥280 | ≥20 | High pressure, high temperature |
| 12Cr1MoVG | 1Cr-1Mo-V | 580 | 470-640 | ≥255 | ≥21 | Advanced high temperature – reheater, headers |
Chemical Composition – 20G (Most Popular Grade)
| Element | C | Si | Mn | P max | S max |
|---|---|---|---|---|---|
| Requirement | 0.17-0.24 | 0.17-0.37 | 0.35-0.65 | 0.030 | 0.030 |
💡 Low phosphorus and sulfur (≤0.030%) ensures excellent toughness and weldability for high pressure boiler service.
GB/T 5310 vs GB/T 3087 – Key Differences
| Feature | GB/T 5310 (High Pressure) | GB/T 3087 (Low/Medium Pressure) |
|---|---|---|
| Working Pressure | ≥9.8MPa | ≤5.88MPa |
| Working Temperature | 450-650°C | ≤450°C |
| Steel Grades | 20G, 15CrMoG, 12Cr1MoVG | 10#, 20# |
| Alloy Content | Carbon + Cr-Mo alloys | Carbon steel only |
| Impact Testing | Required for alloy grades | Not required |
| Heat Treatment | Normalized or N+T | As-rolled or normalized |
| Cost | Higher | Lower |
| Typical Use | Power plant boilers | Industrial boilers |
💡 Choose GB/T 5310 for high pressure boiler applications where working pressure exceeds 9.8MPa and temperatures exceed 450°C.
Available Sizes – GB/T 5310
Hot Rolled Tubes:
| OD (mm) | WT Range (mm) | Typical Grade | Application |
|---|---|---|---|
| 22 – 60 | 2.0 – 8.0 | 20G | Small boiler tubes |
| 60 – 114 | 3.0 – 12.0 | 20G, 15CrMoG | General boiler |
| 114 – 219 | 5.0 – 20.0 | 20G, 12Cr1MoVG | Main steam – most common |
| 219 – 325 | 6.0 – 30.0 | 12Cr1MoVG, 12Cr2MoG | Headers, large tubes |
| 325 – 530 | 8.0 – 70.0 | 12Cr2MoG | Superlarge headers |
Applications – High Pressure Boiler Service
| Industry | Application | Recommended Grade | Service Temp/Pressure |
|---|---|---|---|
| Power Generation | Superheater tubes | 15CrMoG, 12Cr1MoVG | 450-580°C |
| Power Generation | Reheater tubes | 15CrMoG, 12Cr1MoVG | 450-580°C |
| Power Generation | Economizer tubes | 20G | ≤400°C |
| Power Generation | Water wall tubes | 20G | ≤400°C |
| Power Generation | Boiler headers | 12Cr2MoG, 12Cr1MoVG | High pressure |
| Industrial Boilers | High pressure steam | 20G | 450°C |
| Petrochemical | High temp transfer lines | 12Cr1MoVG | Up to 580°C |
Quality Assurance & Testing
| Test | Method | Coverage | Requirement |
|---|---|---|---|
| Hydrostatic Test | Water pressure | 100% | Mandatory |
| Ultrasonic Testing (UT) | Non-destructive | By agreement | Optional |
| Eddy Current (ET) | Non-destructive | By agreement | Optional |
| Tensile Test | EN ISO 6892-1 | Per lot | All grades |
| Impact Test (Charpy) | GB/T 229 | Per lot | Alloy grades |
| Flattening Test | Ductility | Per lot | All grades |
| Flaring Test | Tube end expansion | Per lot | All grades |
| Microstructure Examination | Metallographic | Per lot | Grain size verification |
| Dimensional Inspection | Micrometer | 100% | All grades |
Mill Test Certificate
EN 10204 Type 3.1 MTC – Provided with heat number
EN 10204 Type 3.2 – Available upon request (third-party: SGS, BV, TUV)
Heat treatment records – Normalizing, tempering temperatures
Mechanical test reports – Tensile, impact, flattening, flaring
Traceability: Full traceability from melt to finished tube
Why Choose Our GB/T 5310 High Pressure Boiler Tubes?
| Advantage | Description |
|---|---|
| Current standard | GB/T 5310-2023 compliant |
| Full grade range | 20G to 12Cr1MoVG – one-stop sourcing |
| 20G in stock | Most popular grade – ready to ship |
| 100% hydrostatic tested | Mandatory per standard – guaranteed integrity |
| Heat treated | Normalized or normalized + tempered |
| High temperature performance | Creep strength data available for alloy grades |
| Full traceability | EN 10204 3.1 MTC with heat number |
| Global export | Shipped to power plants and boiler manufacturers worldwide |
Contact for Quote
Please provide the following details:
Grade : 20G / 15MoG / 15CrMoG / 12Cr2MoG / 12Cr1MoVG
OD (mm) : _______
WT (mm) : _______
Length (m) : _______
Quantity : _______ (pieces / meters / tons)
Application : Superheater / Reheater / Economizer / Water wall / Header
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 5310
Q1: What is the current version of GB/T 5310?
A: GB/T 5310-2023 (effective April 1, 2024), superseding GB/T 5310-2017.
Q2: What is the most popular grade in GB/T 5310?
A: 20G – carbon steel grade with ≥245 MPa yield, used for economizers, water walls, and low temperature superheaters.
Q3: What is the difference between 20G and 15CrMoG?
A: 20G – carbon steel, 450°C max, lower cost. 15CrMoG – Cr-Mo alloy, 550°C max, better oxidation and creep resistance, higher cost.
Q4: What is the maximum temperature for GB/T 5310 tubes?
A: Up to 650°C with alloy grades like 12Cr1MoVG and 12Cr2MoG.
Q5: Does GB/T 5310 require hydrostatic testing?
A: Yes – 100% hydrostatic testing is mandatory for all high pressure boiler 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 20G available. Shipping fee applies.
Related Products
GB/T 5310 – High pressure boiler tubes (this product)
GB/T 3087 – Low & medium pressure boiler tubes
GB/T 8163 – Seamless fluid transport tubes
ASTM A192 – High pressure boiler tubes (US standard)
EN 10216-2 – European pressure tube standard for elevated temperature
Tags: GB/T 5310 High Pressure Boiler Tube 20G 15CrMoG 12Cr1MoVG PSeamless Boiler Tube Power Plant Tube Chinese Standard
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