EN10297-1 34CrMo4 Seamless Steel Tube
EN10297-1 34CrMo4 Seamless Steel Tube for Automotive and Structural Applications
Detailed material data for 34CrMo4 alloy steel seamless tube according to EN 10297-1, including chemical composition, mechanical properties, physical and thermal properties, international equivalents, and application guidelines.
Hot rolling, cold drawing, forging, machining, quenching and tempering, normalizing
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EN10297-1 34CrMo4 Seamless Steel Tube Introduction
34CrMo4 is a chromium-molybdenum alloy steel specified in EN 10297-1 for seamless circular steel tubes intended for mechanical and general engineering purposes, especially in the automotive and structural sectors. It is characterized by its excellent hardenability, high strength, and good toughness after quenching and tempering.
- Good combination of strength and ductility
- Suitable for heat treatment (quenching and tempering)
- High fatigue resistance and impact toughness at low temperatures
- Often used in medium to high-stress components
EN10297-1 34CrMo4 Seamless Steel Tube Chemical Composition
Chemical composition according to EN 10297-1 for grade 34CrMo4 based on cast analysis. All values are in percent by mass. The steel is alloyed with chromium and molybdenum to enhance hardenability and high-temperature strength. Residual elements may be present but are not specified here as they are controlled to typical steelmaking practices.
- Low phosphorus and sulfur for improved cleanliness
- Molybdenum contributes to high-temperature strength and resistance to temper embrittlement
| Element | Standard Value (%) | Remarks |
|---|---|---|
| Carbon (C) | 0.30 – 0.37 | Cast analysis |
| Silicon (Si) | ≤ 0.40 | Cast analysis |
| Manganese (Mn) | 0.50 – 0.80 | Cast analysis |
| Phosphorus (P) | ≤ 0.025 | Cast analysis |
| Sulfur (S) | ≤ 0.035 | Cast analysis |
| Chromium (Cr) | 0.90 – 1.20 | Cast analysis |
| Molybdenum (Mo) | 0.15 – 0.30 | Cast analysis |
EN10297-1 34CrMo4 Seamless Steel Tube Thermal and Electrical Physical Properties
The following physical properties are typical values for 34CrMo4 alloy steel at ambient conditions and elevated temperatures where applicable. These values are not part of the standard's mandatory requirements but are useful for design and thermal calculations.
- Density, elastic moduli, and electrical resistivity are given at room temperature
- Thermal expansion and thermal conductivity are provided for a range of temperatures
- Values are based on data for similar Cr‑Mo steels and may vary slightly depending on heat treatment
| Property | Typical Value | Unit | Test Condition / Temperature |
|---|---|---|---|
| Density (ρ) | 7.85 | g/cm³ | 20°C |
| Modulus of elasticity (E) | 205 | GPa | 20°C |
| Shear modulus (G) | 80 | GPa | 20°C |
| Poisson's ratio (ν) | 0.30 | – | 20°C |
| Thermal expansion coefficient (α) | 11.1 | 10⁻⁶/K | 20 – 100°C |
| Thermal expansion coefficient (α) | 12.1 | 10⁻⁶/K | 20 – 200°C |
| Thermal expansion coefficient (α) | 12.9 | 10⁻⁶/K | 20 – 300°C |
| Thermal expansion coefficient (α) | 13.5 | 10⁻⁶/K | 20 – 400°C |
| Thermal expansion coefficient (α) | 13.9 | 10⁻⁶/K | 20 – 500°C |
| Thermal conductivity (λ) | 42 | W/(m·K) | 20°C |
| Thermal conductivity (λ) | 39 | W/(m·K) | 400°C |
| Specific heat capacity (cp) | 460 | J/(kg·K) | 20°C |
| Electrical resistivity (ρe) | 0.21 | 10⁻⁶ Ω·m | 20°C |
EN10297-1 34CrMo4 Seamless Steel Tube Mechanical Properties
Mechanical properties at room temperature for tubes in the quenched and tempered (+QT) condition according to EN 10297-1. Properties depend on wall thickness; the values shown here correspond to wall thickness 20 < t ≤ 50 mm. For thinner or thicker sections, different strength levels apply.
- Minimum impact energy is specified at -20°C in longitudinal direction
- Elongation is measured on a proportional test piece (L0 = 5.65√S0)
- Yield strength refers to upper yield strength (ReH)
| Property | Standard Requirement | Unit | Test Condition |
|---|---|---|---|
| Tensile strength (Rm) | 700 – 850 | MPa | Room temperature, longitudinal |
| Yield strength (ReH) | ≥ 490 | MPa | Room temperature, longitudinal |
| Elongation after fracture (A) | ≥ 14 | % | L0 = 5.65√S0, room temperature |
| Impact energy (KV2) | ≥ 27 | J | -20°C, longitudinal, V‑notch |
EN10297-1 34CrMo4 Seamless Steel Tube Fully Equivalent Material Standards and Alternate Designations
| Country/Region | Standard | Designation | Remarks |
|---|---|---|---|
| European Union | EN 10297-1 | 34CrMo4 | Primary standard for seamless tubes |
| Germany | DIN 17204 | 34CrMo4 | Material number 1.7220 |
| International | ISO 683-1 | 34CrMo4 | Heat-treatable alloy steel |
| France | NF A35-552 | 34CrMo4 | Equivalent grade |
EN10297-1 34CrMo4 Seamless Steel Tube Application Introduction
34CrMo4 seamless tubes are extensively used in the automotive and structural industries for components that require high strength, toughness, and wear resistance. The material is typically delivered in the quenched and tempered condition to achieve optimal mechanical properties.
- Good machinability after appropriate heat treatment
- Weldable with proper precautions (preheating and post-weld heat treatment recommended)
- Suitable for induction hardening to increase surface hardness
Product Applications: Seamless tubes for drive shafts, Axles and axle tubes, Piston rods, Cylinders and bushings, High-pressure pipes and drill rods
Processed into products: Drive shaft and half shaft, Steering knuckle and stub axle, Gear shaft and pinion shaft, Hydraulic cylinder barrel, Roll cage and structural tube members, Downhole drilling tool components
Application industries: Automotive manufacturing, Mechanical engineering, Oil and gas equipment, Power generation, Construction machinery
EN10297-1 34CrMo4 Seamless Steel Tube Similar / Closely Related Material Recommendations
| Country/Region | Standard | Designation | Remarks |
|---|---|---|---|
| China | GB/T 3077 | 35CrMo | Slightly higher carbon content, similar properties |
| Japan | JIS G4105 | SCM435 | Comparable Cr-Mo steel, widely used in automotive |
| USA | ASTM A29 | 4135 | Similar alloying concept, minor adjustment in composition |
| Russia | GOST 4543 | 35KhM | Equivalent to 35CrMo, similar performance |
Notes:
Heat treatment: Recommended quenching at 830–860°C in oil or water, followed by tempering at 540–680°C depending on desired strength level. Welding: Preheating to 200–300°C is advisable; stress relieving after welding is often required to avoid cracking. Surface hardening: The steel responds well to induction or flame hardening. Standards note: Always refer to the latest version of EN 10297-1 for precise delivery conditions and supplementary requirements.
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