QSTE460TM Hot Rolled Steel Coil
QSTE460TM Hot Rolled Steel Coil: High-Strength Microalloyed Fine-Grain Steel for Automotive Structures
Detailed material data for QSTE460TM hot rolled steel coil per Q/BQB 310-2009 and SEW 092, covering chemical composition, mechanical properties, physical properties, international equivalents, and application guidance.
Thermomechanical rolling (TM), hot rolling, pickling
- Phone : +8618037372205
- Email : [email protected]
- WhatsApp: Contact via Whtsapp
- WeChat: +8618037372205
QSTE460TM Hot Rolled Steel Coil Introduction
QSTE460TM is a hot-rolled microalloyed fine-grain structural steel grade specified under Baosteel standard Q/BQB 310-2009 (derived from SEW 092). It is produced via thermomechanical rolling (TM) to achieve a minimum yield strength of 460 MPa with excellent cold formability, weldability, and impact toughness. The steel is primarily used in the automotive industry for manufacturing structural and chassis components that require weight reduction without compromising safety or durability.
- Fine-grain structure with controlled microalloying elements (Nb, Ti, V) ensures high strength and good formability.
- Typical delivery condition: hot-rolled and pickled, or as-rolled coil/plate.
- Widely recognized as the domestic counterpart to European grade S460MC (EN 10149-2).
- Suitable for cold forming operations including bending, drawing, and light punching.
QSTE460TM Hot Rolled Steel Coil Chemical Composition
The chemical composition limits for QSTE460TM are based on Q/BQB 310-2009 and corresponding SEW 092 / EN 10149-2 requirements. The steel is microalloyed with niobium, titanium, and vanadium to refine grain size and enhance strength through precipitation hardening. Strict control of phosphorus and sulfur ensures good formability and weldability.
- Typical ladle analysis values; product analysis may vary within permitted tolerances.
- Aluminum is added for deoxidation and grain refinement.
| Element | Standard Value (max, wt%) | Remarks |
|---|---|---|
| C | ≤ 0.12 | Carbon |
| Si | ≤ 0.50 | Silicon |
| Mn | ≤ 1.60 | Manganese |
| P | ≤ 0.025 | Phosphorus |
| S | ≤ 0.015 | Sulfur |
| Alt | ≥ 0.015 | Total aluminum |
| Nb | ≤ 0.09 | Niobium |
| V | ≤ 0.20 | Vanadium |
| Ti | ≤ 0.22 | Titanium |
QSTE460TM Hot Rolled Steel Coil Thermal and Electrical Physical Properties
The following physical properties are approximate values for fine-grain structural steel at room temperature, unless otherwise noted. These are not part of the material standard but serve as general engineering data for design calculations.
- Density is similar to that of pure iron.
- Thermal expansion and conductivity values are influenced by the pearlite/ferrite microstructure.
| Property | Typical Value | Unit | Test Condition |
|---|---|---|---|
| Density (ρ) | 7.85 | g/cm³ | 20 °C |
| Elastic modulus (E) | 210 | GPa | 20 °C |
| Shear modulus (G) | About 80 | GPa | 20 °C |
| Poisson's ratio (ν) | 0.3 | – | 20 °C |
| Thermal expansion coefficient (α) | 12 × 10⁻⁶ | 1/K | 20 – 100 °C |
| Thermal conductivity (λ) | About 50 | W/(m·K) | 20 °C |
| Specific heat capacity | About 460 | J/(kg·K) | 20 °C |
| Electrical resistivity (ρ_e) | 0.15 – 0.25 | Ω·mm²/m | 20 °C |
QSTE460TM Hot Rolled Steel Coil Mechanical Properties
Mechanical properties are determined by transverse specimens taken from the as-delivered thermomechanically rolled condition. Values are valid for hot rolled products.
- The minimum yield strength (ReH) applies for thicknesses up to 16 mm.
- Impact energy is measured on longitudinal Charpy V-notch specimens at -20 °C.
- Bend test requirement: no cracking when bent around a mandrel diameter of 0.5t (t = specimen thickness) through 180°.
| Property | Standard Required Value | Unit | Test Condition |
|---|---|---|---|
| Yield strength (ReH) | ≥ 460 | MPa | Transverse, t ≤ 16 mm |
| Tensile strength (Rm) | 520 – 670 | MPa | Transverse, t ≤ 16 mm |
| Elongation (A80) | ≥ 14 | % | t < 3 mm, gauge length 80 mm |
| Elongation (A80) | ≥ 16 | % | 3 mm ≤ t ≤ 16 mm, gauge length 80 mm |
| Bend test (mandrel diameter) | 0.5t | 180° bend, no cracking | |
| Impact energy (KV) | ≥ 40 | J | Longitudinal, -20 °C |
QSTE460TM Hot Rolled Steel Coil Completely Equivalent Material Standards and Replaceable Grades
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| China | Q/BQB 310-2009 | QSTE460TM | Original Baosteel standard; former SEW 092 designation |
| Europe | EN 10149-2:2013 | S460MC | Identical chemical and mechanical requirements; fully interchangeable |
| International | ISO 6930-2 | FeE460MC | Equivalent fine-grain microalloyed steel for cold forming |
| Germany (historical) | SEW 092 | QStE460TM | Predecessor specification of Q/BQB 310; same grade family |
QSTE460TM Hot Rolled Steel Coil Application Introduction
QSTE460TM combines high strength with excellent cold formability, making it ideal for lightweight automotive structural components. Its fine-grain structure and microalloying provide good fatigue resistance and impact toughness, even at subzero temperatures. The thermomechanical rolling process ensures stable mechanical properties without additional heat treatment. Typical applications include:
Product Applications: Longitudinal beams and cross members of chassis, Engine cradles and subframes, Suspension arms and control brackets, Reinforcement panels and structural body parts, Wheel rims and disc wheels, Seat frames and safety components
Processed into products: Side members, Cross members, Spring brackets, Tow hooks, Mounting plates, Flanges and gussets
Application industries: Automotive manufacturing (passenger cars, commercial vehicles), Construction machinery and agricultural equipment, Railway vehicle structures, General mechanical engineering
QSTE460TM Hot Rolled Steel Coil Near Equivalent / Similar Material Recommendations
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| Europe | EN 10149-2 | S420MC | Lower yield strength (≥420 MPa), slightly better formability; may replace QSTE460TM for less demanding applications |
| Europe | EN 10149-2 | S500MC | Higher yield strength (≥500 MPa), requires more forming power; alternative for higher strength needs |
| Japan | JIS G 3113 | SAPH440 | Automotive structural hot-rolled steel; yield ~305–440 MPa, lower strength, not a direct substitute |
Notes:
Ordering considerations:
- Products can be ordered as hot rolled coils or sheets, either pickled or unpickled.
- Thickness tolerances, flatness, and surface quality should be agreed upon at the time of inquiry.
- Welding procedures follow standard practices for fine-grain structural steels (preheating not normally required).
- The steel is not intended for further heat treatment; its mechanical properties are achieved through TM rolling.
- Share
