EN10025-6 S960Q ERW Pipe
EN10025-6 S960Q High Strength Quenched and Tempered Steel for ERW Pipe
Technical data for S960Q steel per EN 10025-6, covering chemistry, mechanical and physical properties, equivalent grades, and usage in ERW pipes.
Hot rolling, cold forming, welding, cutting, machining, heat treatment (quenching and tempering)
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EN10025-6 S960Q ERW Pipe Introduction
S960Q is a high-strength quenched and tempered structural steel grade specified in EN 10025-6. It offers a minimum yield strength of 960 MPa in thicknesses up to 50 mm, combined with good toughness and weldability. This grade is used in demanding structural applications where weight reduction and high load-bearing capacity are critical.
- High yield and tensile strength
- Good impact toughness at -20°C (Q designation)
- Suitable for welding with appropriate precautions
- Available as plates, strips and hollow sections
The ERW pipe form is produced by cold forming and welding from hot-rolled strip, maintaining mechanical properties after appropriate heat treatment.
EN10025-6 S960Q ERW Pipe Chemical Composition
The chemical composition of S960Q steel according to EN 10025-6 is designed to achieve high strength and toughness through quenching and tempering. Typical element ranges are indicated; exact values depend on product thickness and manufacturer. Maximum limits are specified to ensure weldability and performance.
| Element | Standard Value (max %) | Remarks |
|---|---|---|
| C | 0.20 | Maximum for t ≤ 50 mm; may be lower for thicker sections |
| Si | 0.80 | Typical range 0.10-0.80 |
| Mn | 1.70 | Maximum, Mn ensures hardenability |
| P | 0.020 | Maximum |
| S | 0.010 | Maximum |
| Cr | 1.50 | Maximum, optional alloying |
| Ni | 2.0 | Maximum, optional |
| Mo | 0.70 | Maximum, optional |
| Cu | 0.50 | Maximum, optional |
| V | 0.12 | Maximum, microalloying |
| Ti | 0.05 | Maximum, microalloying |
| Nb | 0.06 | Maximum, microalloying |
| B | 0.005 | Maximum, optional for hardenability |
| N | 0.015 | Maximum |
| Al | ≥0.015 | Usually added for grain refinement |
EN10025-6 S960Q ERW Pipe Thermal and Electrical Physical Properties
Physical properties for S960Q grade are typical for quenched and tempered low-alloy structural steels. These values are derived from general material data and may slightly vary. They are useful for design calculations, heat transfer, and electrical resistivity considerations.
| Property | Typical Value | Unit | Condition/Remarks |
|---|---|---|---|
| Density ρ | 7850 | kg/m³ | At 20°C |
| Modulus of elasticity E | 210 | GPa | At 20°C |
| Shear modulus G | 80 | GPa | Calculated from E and ν |
| Poisson's ratio ν | 0.3 | - | At 20°C |
| Thermal expansion coefficient α | 11.5 | 10⁻⁶/K | Between 20°C and 100°C |
| Thermal expansion coefficient α | 12.3 | 10⁻⁶/K | Between 20°C and 300°C |
| Thermal conductivity λ | 35 | W/(m·K) | At 20°C |
| Specific heat capacity Cp | 460 | J/(kg·K) | At 20°C |
| Electrical resistivity ρ_e | 0.23 | µΩ·m | At 20°C |
EN10025-6 S960Q ERW Pipe Mechanical Properties
Mechanical properties of S960Q depend on product thickness. Values are according to EN 10025-6 for quenched and tempered condition. The table lists yield strength, tensile strength, elongation and impact energy requirements for flat and long products. Actual values may vary for ERW pipes depending on forming and welding procedures.
| Property | Standard Requirement | Unit | Test Condition |
|---|---|---|---|
| Yield strength ReH | ≥960 | MPa | Thickness ≤ 50 mm |
| Yield strength ReH | ≥900 | MPa | 50 < t ≤ 100 mm |
| Yield strength ReH | ≥850 | MPa | 100 < t ≤ 150 mm |
| Tensile strength Rm | 1000 - 1200 | MPa | t ≤ 100 mm |
| Tensile strength Rm | 950 - 1150 | MPa | 100 < t ≤ 150 mm |
| Elongation A (L0=5.65√So) | ≥10 | % | t ≤ 50 mm, longitudinal |
| Elongation A | ≥10 | % | 50 < t ≤ 100 mm |
| Elongation A | ≥9 | % | 100 < t ≤ 150 mm |
| Impact energy KV (longitudinal) | ≥27 | J | -20°C (Q grade) |
| Impact energy KV (transverse) | ≥16 | J | -20°C (Q grade) |
| Bend test (if required) | D = 3a (180°) | - | For plate/section per standard |
EN10025-6 S960Q ERW Pipe Complete Equivalent Material Standards and Substitutable Grades
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| European Union | EN 10025-6:2004+A1:2009 | S960Q | Original specification |
| International | ISO 630-6:2014 | S960Q | Harmonized international standard |
| United Kingdom | BS EN 10025-6:2004+A1:2009 | S960Q | Identical adoption |
| Germany | DIN EN 10025-6 | S960Q | National adoption |
| France | NF EN 10025-6 | S960Q | National adoption |
EN10025-6 S960Q ERW Pipe Application Introduction
S960Q steel is ideal for weight-critical, high-strength applications where excellent mechanical properties and good weldability are required. Typical industries and applications are listed below. The steel can be formed into plates, pipes, and profiles for fabrication.
Product Applications: Crane booms and jibs, Chassis frames for heavy trucks, Pressure vessels and storage tanks, Structural beams and columns in bridges, Offshore platform legs and nodes, ERW steel pipes for high-pressure applications
Processed into products: Welded structural joints, Mobile crane telescopic arms, Excavator buckets and arms, Earthmoving equipment frames, Penstock pipes, Heavy-duty conveyor rollers, Pipe piles
Application industries: Construction and infrastructure, Crane and heavy lifting equipment, Mining machinery, Offshore and marine engineering, Transport and automotive (heavy-duty vehicles)
EN10025-6 S960Q ERW Pipe Similar / Alternative Material Recommendations
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| European Union | EN 10025-6 | S960QL | Improved low-temperature toughness at -40°C, otherwise similar |
| European Union | EN 10025-6 | S960QL1 | Toughness at -60°C, otherwise similar |
| China | GB/T 16270-2009 | Q960E | Chinese standard for quenched and tempered high strength steel, similar strength and impact at -40°C |
| USA | ASTM A514/A514M | Grade Q | Lower yield strength (min 690 MPa), but similar quenched/tempered structural steel |
Notes:
S960Q steel may require preheating before welding and post-weld heat treatment depending on thickness and welding procedure. Recommendations according to EN 1011-2 should be followed. For ERW pipe production, the cold forming process may reduce toughness; subsequent stress relief or normalizing of the weld zone could be required to restore properties.
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