SPHT1 Steel Coil for Pipes
JIS G3132 SPHT1 Hot-Rolled Carbon Steel Strip for Pipes – Composition & Mechanical Data
Complete material data for SPHT1 hot-rolled carbon steel strip compliant with JIS G3132-2011. Includes chemical composition, mechanical properties, physical properties, international equivalents, and application guidance for pipe manufacturing.
Hot rolling, pickling, oiling, slitting, cold forming, welding, bending, roll forming
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SPHT1 Steel Coil for Pipes Introduction
JIS G3132 SPHT1 is a hot-rolled carbon steel strip intended for the manufacture of welded pipes and tubes. This grade provides excellent cold formability and weldability owing to its low carbon content and controlled composition. It is supplied in the hot-rolled condition, often pickled and oiled, with a smooth surface finish suitable for subsequent forming and profiling. Typical applications include
- low-pressure fluid conveyance pipes
- structural hollow sections
- automotive exhaust components
- general-purpose mechanical tubing
SPHT1 exhibits moderate strength with guaranteed minimum tensile strength of 270 MPa and high elongation values, ensuring reliable ductility during pipe making and further processing. Its international equivalents allow global sourcing and substitution.
SPHT1 Steel Coil for Pipes Chemical Composition
The chemical composition of SPHT1 is defined in JIS G3132. Specific limits ensure good weldability and formability. Deoxidation practice (rimmed, capped, semi-killed) may be agreed upon, but no deliberate addition of Al, Nb, V, or Ti is specified.
- Carbon is kept low (≤0.10%) to prevent hardening during welding and forming.
- Manganese aids strength without significantly reducing ductility.
- Phosphorus and sulfur are controlled to standard hot-rolled steel levels to avoid embrittlement.
| Chemical Element | Standard Value | Remarks |
|---|---|---|
| C | ≤ 0.10 | Maximum mass fraction |
| Si | ≤ 0.35 | Maximum mass fraction |
| Mn | ≤ 0.50 | Maximum mass fraction |
| P | ≤ 0.040 | Maximum mass fraction |
| S | ≤ 0.040 | Maximum mass fraction |
SPHT1 Steel Coil for Pipes Thermal and Electrical Physical Properties
Physical properties are typical for low-carbon hot-rolled steel and are not part of the JIS G3132 standard. They are provided as engineering reference data.
- Density is standard for carbon steel.
- Elastic moduli and Poisson's ratio are typical for structural steels.
- Thermal expansion and conductivity are representative at room temperature.
- Electrical resistivity increases slightly with temperature and alloy content.
| Property | Standard Required Value | Unit | Test Condition |
|---|---|---|---|
| Density (ρ) | ≈ 7.85 | g/cm³ | At 20 °C |
| Modulus of Elasticity (E) | ≈ 205 | GPa | At 20 °C |
| Shear Modulus (G) | ≈ 80 | GPa | Calculated from E and ν |
| Poisson's Ratio (ν) | ≈ 0.30 | — | Within elastic range |
| Thermal Expansion Coefficient (α) | ≈ 12.0 × 10⁻⁶ | K⁻¹ | Between 20 °C and 100 °C |
| Thermal Conductivity (λ) | ≈ 53 | W/(m·K) | At 20 °C |
| Specific Heat Capacity | ≈ 480 | J/(kg·K) | At 20 °C |
| Electrical Resistivity (ρₑ) | ≈ 0.15 | µΩ·m | At 20 °C |
SPHT1 Steel Coil for Pipes Mechanical Properties
Mechanical properties are determined at room temperature on test pieces taken in the rolling direction as per JIS G3132. The tensile test uses JIS No.5 specimen for thickness up to 3.2 mm and No.1A specimen for thickness over 3.2 mm. Bend test is performed at 180° with a mandrel diameter related to the strip thickness.
- Elongation values are thickness-dependent; thinner gauges exhibit higher ductility.
- No specific yield strength is required; the material is characterized by minimum tensile strength.
| Property | Standard Required Value | Unit | Test Condition |
|---|---|---|---|
| Tensile Strength (Rm) | ≥ 270 | MPa | Thickness ≤ 20 mm |
| Elongation (A) | ≥ 30 | % | Thickness ≤ 1.6 mm, JIS No.5 specimen (rolling direction) |
| Elongation (A) | ≥ 30 | % | 1.6 < thickness ≤ 3.2 mm, JIS No.5 specimen (rolling direction) |
| Elongation (A) | ≥ 25 | % | 3.2 < thickness ≤ 6.0 mm, JIS No.1A specimen (rolling direction) |
| Elongation (A) | ≥ 21 | % | 6.0 < thickness ≤ 20 mm, JIS No.1A specimen (rolling direction) |
| Bend Test (180°) | No cracks on outer surface | — | Bending diameter: 0.5 × thickness (d = 0.5a) |
SPHT1 Steel Coil for Pipes Exact Equivalent Grades & Recommended Substitutes
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| Japan | JIS G3132 | SPHT1 | Original base grade |
| European Union | EN 10111 | DD11 | Comparable hot-rolled strip for cold forming and pipe; slightly different composition |
| United States | ASTM A1011 | CS Type B | Hot-rolled carbon steel strip; similar strength and ductility |
| China | GB/T 700 | Q195 | Similar carbon content and mechanical strength; widely used for pipes |
| International | ISO 3573 | HR1 | Hot-rolled carbon steel sheet of commercial quality for bending and moderate forming |
SPHT1 Steel Coil for Pipes Application Introduction
SPHT1 is designed for pipe and tube manufacturing, offering excellent cold formability, reliable weldability, and uniform mechanical properties. It can be processed into a wide variety of welded tubes, structural hollow sections, and formed components. The low carbon equivalent ensures trouble-free gas metal arc welding (GMAW), laser welding, and resistance welding without preheating. Common final products span multiple industries.
- Suitable for subsequent coating, painting, or galvanizing.
- Can be easily bent, flanged, expanded, and swaged.
- Often used in the as-rolled condition without heat treatment.
Product Applications: Water supply pipes, Gas pipes (non-critical), Structural hollow sections (square, rectangular tubes), Exhaust pipes and mufflers, Bicycle frames and parts, Handlebar tubes, Conveyor rollers, Greenhouse frames, Scaffolding tubes, Heat exchanger tubes (non-corrosive service)
Processed into products: Welded pipe and tube bodies, Exhaust manifolds, Steering column tubes, Shock absorber housings, Furniture legs and frames, Door frames, Handrails, Chassis members (light vehicles), Bicycle frames (low-end), Agricultural equipment frames
Application industries: Automotive components, Construction and infrastructure, Furniture and interior design, Agricultural and machinery tubing, Fluid transportation (low pressure)
SPHT1 Steel Coil for Pipes Similar / Alternative Materials for Reference
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| Japan | JIS G3132 | SPHT2 | Higher tensile strength (≥340 MPa); slightly lower ductility |
| Europe | EN 10111 | DD12 | Higher strength variant of DD11; suitable for more demanding forming |
| USA | ASTM A1011 | CS Type A | Lower carbon variant; very soft, deep drawing capability |
| China | GB/T 711 | 10 | Hot-rolled quality structural carbon steel; good weldability, moderate strength |
Notes:
Weldability: Excellent with all common fusion and resistance welding processes. Post-weld heat treatment: Not normally required. Surface condition: Usually supplied pickled and oiled to prevent rust and improve formability; can be ordered with a tight scale if required. Tolerances: Dimensional tolerances follow JIS G3132 or as agreed. For applications requiring improved surface quality, a descaled condition is recommended. Not intended for elevated temperature service or pressure vessels without further qualification.
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