1. Material Composition & Key Properties
Q: What defines the chemical/mechanical properties of C22E?
A:
Chemical (wt%):
C: 0.17–0.24 | Mn: 0.40–0.70 | P: ≤0.025 | S: ≤0.025 | Si: ≤0.40.
Mechanical:
Yield Strength (σᵧ): ≥275 MPa | Tensile (σₜ): 410–560 MPa.
Elongation (A₅): ≥22% | Hardness: ≤160 HB.
Note: C22E is a non-alloy carbon steel with good machinability and weldability (Ceq ≤0.38).
2. Manufacturing & Standards Compliance
Q: How are C22E tubes produced and certified?
A:
Process: Seamless (hot-rolled/cold-drawn) or welded (ERW/SAW).
Heat Treatment: Normalized (EN 10297-1 §6.2) or as-rolled.
Standard Scope: EN 10297-1 for general mechanical/structural applications.
3. Dimensional Tolerances
Q: What tolerances apply to C22E tubes?
A:
| Parameter | Tolerance |
|---|---|
| OD (D) | ±1.0% (min ±0.5 mm) |
| Wall Thickness | ±10% (min ±0.3 mm) |
| Straightness | ≤1.5 mm/m |
4. Applications & Limitations
Q: Where is C22E typically used?
A:
General Engineering: Hydraulic cylinders, conveyor rollers.
Automotive: Chassis components, exhaust systems (cold-drawn).
Avoid:
Temperatures >350°C (risk of scaling).
Corrosive environments without coatings.
5. Quality Validation & Certifications
Q: How is quality assured?
A:
Tests: Tensile (EN ISO 6892-1), hardness (EN ISO 6506-1).
Certifications: EN 10204 3.1/3.2 | PED 2014/68/EU (Category II).
