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Help CenterGB/T 8163 Seamless Steel Tube for Fluid Transport General Liquid Service Grades 10, 20, Q345
Product Spotlights
General Liquid Service – Water, Oil, Gas – Ambient to 350°C
Grades 10, 20, Q345
Current Standard: GB/T 8163-2018
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GB/T 8163 Seamless Steel Tube for Fluid Transport
General Liquid Service – Water, Oil, Gas – Ambient to 350°C
Grades 10, 20, Q345
Current Standard: GB/T 8163-2018
Product Overview
GB/T 8163 is the Chinese national standard for seamless steel tubes used for general liquid service – transporting water, oil, gas, and other fluids. These tubes are designed for ambient to moderate temperature service where pressure requirements are not extreme .
Key Applications:
Water supply and drainage systems
Oil and gas transmission lines (low to medium pressure)
General fluid transport in industrial plants
Compressed air systems
Standard Status – Important Update:
Current standard: GB/T 8163-2018
Quality ranking: GB/T 8163 has the lowest quality level among the standards discussed. The quality ranking from low to high is: GB/T 8163
✅ GB/T 8163-2018 compliant – Current standard
✅ General fluid service – Water, oil, gas, and other media
✅ Seamless construction – Hot rolled or cold drawn
✅ Economical choice – Lower cost than pressure-specific standards
✅ 100% hydrostatic tested – Per standard requirements
✅ EN 10204 Type 3.1 MTC provided with full traceability
✅ Factory direct | Global shipping
Key Specifications
| Parameter | Details |
|---|---|
| Standard | GB/T 8163-2018 |
| Product Type | Seamless Steel Tube for Liquid Service |
| Steel Grades | 10, 20, Q345 |
| OD Range | 6mm – 610mm |
| Wall Thickness | 1.5mm – 40mm |
| Length | 4m – 12m (fixed or random) |
| Delivery Condition | Hot rolled as-rolled; Cold drawn heat treated |
| Surface Finish | Black / Bare / Oiled |
| End Finish | Plain / Beveled / Threaded |
Steel Grade Overview
| Grade | Tensile (MPa) | Yield (MPa) | Elongation (%) | Application |
|---|---|---|---|---|
| 10 | 335-475 | ≥205 | ≥24 | Low pressure water/air |
| 20 | 410-550 | ≥245 | ≥20 | General fluid – most popular |
| Q345 | 490-665 | ≥325 | ≥21 | High strength structural |
💡 Grade 20 is the most popular for general fluid transport – offering excellent strength at an economical price point .
Key Selection Note – Application Limits
According to engineering guidelines, GB/T 8163 tubes are suitable for :
Temperature:
Pressure:
Media: Water, oil, gas, and other general fluids
⚠️ Do NOT use GB/T 8163 tubes for:
High pressure boiler applications (use GB/T 5310)
Low temperature service below -20°C (use GB/T 6479 for -40°C)
Critical refinery or petrochemical service (use GB/T 9948)
Quality Ranking – When to Use Each Standard
| Standard | Quality Level | Application | When to Use |
|---|---|---|---|
| GB/T 8163 | Lowest | General fluid, | Non-critical, economical |
| GB/T 9948 | Higher | Refinery, petrochemical | When GB/T 8163 is insufficient |
| GB/T 6479 | Highest | High pressure chemical, -40°C | Critical, high pressure, low temp |
| GB/T 5310 | Higher | High pressure boiler | Boiler, power plant |
💡 Quality ranking from low to high: GB/T 8163 Available Sizes Quality Assurance & Testing Applications Why Choose Our GB/T 8163 Fluid Transport Tubes? Contact for Quote 📧 Email: yjhtrade@gmail.com Reply within 24 hours. FAQ – GB/T 8163 Q1: What is GB/T 8163 used for? Q2: What is the most popular grade? Q3: Can GB/T 8163 tubes be used for high pressure boiler applications? Q4: Can GB/T 8163 tubes be used for low temperature service? Q5: What is the quality ranking? Q6: Is impact testing required? Q7: Do you provide third-party inspection? Related Products GB/T 8163 – General fluid transport (this product) GB 9948 – Petroleum cracking tubes GB 6479 – High pressure fertilizer tubes GB 5310 – High pressure boiler tubes Tags: GB/T 8163 Fluid Transport Tube Seamless Steel Pipe 20# Water Pipe General Fluid Service
OD (mm)
WT Range (mm)
Grade
Application
21.3
2.0 – 5.0
20
Small bore piping
33.7
2.5 – 6.0
20
General fluid
48.3
3.0 – 10.0
20
Main water/oil lines
88.9
4.0 – 16.0
20, Q345
Main transport lines
114.3
4.0 – 20.0
20, Q345
Water/oil mains
168.3
5.0 – 25.0
Q345
Large diameter mains
Test
Method
Coverage
Requirement
Hydrostatic Test
Water pressure
100%
Mandatory
Tensile Test
EN ISO 6892-1
Per lot
Mandatory
Flattening Test
Ductility
Per lot
Mandatory
Chemical Analysis
Spectrometry
Per heat
Mandatory
Dimensional Inspection
Micrometer
100%
Mandatory
Flaring Test
By agreement
Optional
For special requirements
Industry
Application
Recommended Grade
Municipal Water
Water supply and drainage
20
Oil & Gas
Crude oil and gas gathering (low pressure)
20
Industrial
Compressed air systems
10, 20
Construction
Scaffolding, structural supports
20, Q345
HVAC
Chilled water, heating water
20
Fire Protection
Fire water lines
20
Advantage
Description
Economical
Lower cost than pressure-specific standards
Good weldability
Low carbon content – standard welding procedures
Wide size range
6mm to 610mm OD – one-stop sourcing
Grade 20 most popular
Excellent balance of strength and cost
100% hydrostatic tested
Guaranteed pressure integrity
Full traceability
EN 10204 3.1 MTC with heat number
📞 WhatsApp: +86 15106174543
🌐 Website: www.hzhmetals.com / www.wuxihengzhihui.com
A: General fluid transport – water, oil, gas, and other media, at temperatures
A: Grade 20 – ≥245 MPa yield, 410-550 MPa tensile .
A: No – use GB 5310 for high pressure boilers .
A: Not recommended – use GB 6479 for low temperature service below -20°C .
A: GB/T 8163 has the lowest quality ranking: GB/T 8163
A: No – impact testing is not required by the standard .
A: Yes. SGS, BV, TUV, or any customer-specified agency.
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