GB/T 8163 Grade 10# Seamless Steel Pipe for Fluid Service
GB/T 8163 Grade 10# Seamless Steel Pipe for Fluid Service - Composition & Performance Guide
Comprehensive material data for GB/T 8163 10# fluid seamless pipe including chemical composition, mechanical properties, thermal and electrical properties, international equivalents, and application examples.
Hot rolling, cold drawing, welding (for fittings), bending, machining
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GB/T 8163 Grade 10# Seamless Steel Pipe for Fluid Service Introduction
GB/T 8163 Grade 10# is a carbon structural steel seamless pipe designed specifically for fluid transportation. It belongs to the Chinese standard system and is widely used for conveying water, oil, gas, and low-pressure steam. The steel exhibits good weldability, cold/hot workability, and moderate strength, making it a cost‐effective choice for general piping applications.
- Controlled carbon and manganese content for balanced strength/ductility
- Reliable mechanical performance under room‐temperature service
- Available in hot‐rolled (H) or cold‐drawn (C) delivery condition
- Often applied without subsequent heat treatment; annealed or normalized when required
GB/T 8163 Grade 10# Seamless Steel Pipe for Fluid Service Chemical Composition
Chemical requirements comply with GB/T 8163, which references GB/T 699 for Grade 10# steel. The limits below are for heat analysis; product analysis tolerances follow the relevant standards.
- Limited phosphorus and sulfur improve cleanliness and toughness.
- Residual elements (Cr, Ni, Cu) are held at low levels to avoid undesirable hardening.
| Element | Specified Value (%) | Remarks |
|---|---|---|
| Carbon (C) | 0.07 – 0.13 | |
| Silicon (Si) | 0.17 – 0.37 | |
| Manganese (Mn) | 0.35 – 0.65 | |
| Phosphorus (P) | ≤ 0.035 | Max. for both heat and product analysis |
| Sulfur (S) | ≤ 0.035 | Max. for both heat and product analysis |
| Chromium (Cr) | ≤ 0.15 | Residual element, not intentionally added |
| Nickel (Ni) | ≤ 0.25 | Residual element, not intentionally added |
| Copper (Cu) | ≤ 0.20 | Residual element, not intentionally added |
GB/T 8163 Grade 10# Seamless Steel Pipe for Fluid Service Thermal and Electrical Physical Properties
The following values are approximate and representative of low-carbon steel in the as-rolled or annealed condition. They may vary slightly with production route and temperature. These data are not part of GB/T 8163 but are commonly used in engineering calculations.
- Density and elastic constants are given at ambient temperature.
- Thermal properties are temperature dependent; the values listed correspond to 20°C–100°C or room temperature as indicated.
| Property | Typical Value | Unit | Test Condition / Temperature |
|---|---|---|---|
| Density (ρ) | 7.85 | g/cm³ | 20 °C |
| Elastic modulus (E) | 200 – 210 | GPa | Ambient |
| Shear modulus (G) | 79 – 81 | GPa | Ambient (calculated) |
| Poisson's ratio (ν) | 0.30 | – | Ambient |
| Thermal expansion (α) | ~ 11.5 × 10⁻⁶ | K⁻¹ | 20–100 °C |
| Thermal conductivity (λ) | ~ 50 | W/(m·K) | 20 °C |
| Specific heat capacity (c) | ~ 460 | J/(kg·K) | 20 °C |
| Electrical resistivity (ρₑ) | ~ 0.12 × 10⁻⁶ | Ω·m | 20 °C |
GB/T 8163 Grade 10# Seamless Steel Pipe for Fluid Service Mechanical Properties
Mechanical properties are based on tensile testing of longitudinal test pieces taken from the pipe wall. Property values refer to room-temperature conditions and are valid for wall thickness ≤16 mm. For thicker walls, requirements may be agreed upon between purchaser and manufacturer.
- No impact test is mandatory for this grade in the standard delivery condition.
- Bend test and flattening test are not normally specified for fluid pipe unless specifically required.
| Property | Specified Value | Unit | Test Condition |
|---|---|---|---|
| Yield Strength (ReH, lower yield) | ≥ 205 | MPa | Room temperature, t ≤ 16 mm |
| Tensile Strength (Rm) | ≥ 335 | MPa | Room temperature |
| Elongation after fracture (A) | ≥ 24 | % | Longitudinal, L₀ = 5.65√S₀ |
GB/T 8163 Grade 10# Seamless Steel Pipe for Fluid Service Recommended Equivalent Standards and Substitutable Grades
Although no single international standard provides an exact 1:1 match, the following grades are commonly referenced as functionally equivalent for fluid transportation piping. End users should verify chemistry and mechanical properties for the specific application.
| Country / Region | Standard | Grade | Remarks |
|---|---|---|---|
| China | GB/T 8163 | 10# | Original grade; reference baseline |
| Japan | JIS G3454 | STPG370 | Close in tensile strength (≥370 MPa) but broader C content; acceptable substitute |
| USA | ASTM A106 | Grade A | Yield (≥205 MPa) and tensile (≥330 MPa) nearly match; for high‑temperature service |
| Europe | EN 10216-1 | P195TR1 | Yield ≥195 MPa, tensile 320–440 MPa; slightly lower strength, can be considered |
| International | ISO 559 | TS360 | Tensile ≥360 MPa; limited availability; composition may differ |
GB/T 8163 Grade 10# Seamless Steel Pipe for Fluid Service Application Introduction
GB/T 8163 Grade 10# fluid seamless pipe is employed in a broad range of low‑to‑medium pressure fluid handling systems. Its excellent workability and cost efficiency make it the material of choice for general‑purpose welded and threaded piping networks.
- Good balance of strength and ductility permits cold bending and flaring.
- Readily weldable with standard carbon‑steel procedures (e.g., ERW, GTAW, SMAW).
- Suitable for both above‑ground and buried installations with proper external protection.
Product Applications: Long‑distance oil/gas transmission pipelines, Steam and condensate return lines, Municipal water mains and distribution pipes, Fire protection sprinkler systems, Heat exchanger and boiler tubes (when meeting additional requirements), Process and utility piping in industrial plants
Processed into products: Pipe bends (hot‑bent or cold‑bent), Butt‑weld fittings: elbows (45° and 90°), tees, reducers, caps, Flanges (weld‑neck, slip‑on, blind) and gaskets, Threaded fittings: nipples, couplings, unions, Valve bodies and other fluid‑handling components fabricated from pipe, Mechanical tubing for low‑stress structures (after further processing)
Application industries: Oil & Gas (transport of crude oil, natural gas, refined products), Water Treatment & Supply (potable water, cooling water, sewage lines), Heating, Ventilation, Air Conditioning (HVAC) (steam and hot water pipelines), Chemical & Petrochemical (low‑pressure process lines, utility piping), Power Generation (boiler feed lines, condenser cooling water), General Engineering & Construction (structural piping, scaffolding tubes)
GB/T 8163 Grade 10# Seamless Steel Pipe for Fluid Service Recommendations for Similar / Nearby Alternative Materials
When higher strength or different fabrication behavior is desired, the following grades within the same or comparable standards can be used as alternatives. They differ mainly in carbon content, strength level, or alloying elements.
| Country / Region | Standard | Grade | Remarks |
|---|---|---|---|
| China | GB/T 8163 | 20# | Higher strength (Rm≥410, ReH≥245); improved wear resistance; slightly reduced weldability |
| China | GB/T 8163 | Q345B | Low‑alloy high‑strength steel; yield ≥345 MPa; for structural and fluid pipe |
| USA | ASTM A106 | Grade B | Widely used in process piping; tensile ≥415 MPa, yield ≥240 MPa |
| Japan | JIS G3454 | STPG410 | Higher tensile grade; may be used where 10# strength is insufficient |
Notes:
- Unless otherwise agreed, the pipe is delivered in an untreated (as‑rolled or as‑drawn) condition. Normalizing or annealing may be performed when specified.
- Hydrostatic pressure test or non‑destructive inspection (NDI) is usually conducted by the manufacturer based on the standard requirements.
- For elevated‑temperature service, the allowable stress values should be taken from the applicable design code (e.g., GB 150, ASME B31.3) rather than from the room‑temperature tensile properties alone.
- Surface quality complies with GB/T 8163; minor seams, laps, or other imperfections within acceptable limits are allowed.
- End finishes: plain ends, beveled for welding, or threaded and capped, according to the client's request.
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