13CrMo4-5 Seamless Tube Material
13CrMo4-5 Seamless Tube: High-Temperature Cr-Mo Alloy Steel for Pressure Applications
Comprehensive material data for 13CrMo4-5 seamless steel tubes according to EN 10216-2, including chemical composition, mechanical and physical properties, international equivalents, and application guidance.
Hot rolling, cold drawing, normalizing + tempering, welding, forging, bending
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13CrMo4-5 Seamless Tube Introduction
13CrMo4-5 is a low-alloy chromium-molybdenum ferritic steel designed for elevated temperature service in pressure-bearing equipment. This grade offers excellent creep strength, good oxidation resistance up to 550 °C, and is widely used for boiler tubes, superheaters, and piping in power plants and petrochemical industries. The steel is delivered in normalized and tempered condition (N+T) to achieve optimal mechanical properties and toughness. It exhibits good weldability when proper preheat and post-weld heat treatment are applied. Typical applications include superheater tubes, reheater tubing, headers, and high-pressure steam piping.
13CrMo4-5 Seamless Tube Chemical Composition
The chemical composition of 13CrMo4-5 is controlled to ensure high-temperature strength and oxidation resistance. Chromium provides creep and oxidation resistance; molybdenum increases high-temperature strength. Residual elements are limited to avoid embrittlement.
| Chemical Element | Standard Value (wt%) | Remarks |
|---|---|---|
| C | 0.10 – 0.17 | Heat analysis |
| Si | 0.10 – 0.35 | |
| Mn | 0.40 – 0.70 | |
| P | ≤ 0.025 | |
| S | ≤ 0.010 | |
| Cr | 0.70 – 1.15 | Key alloying element for creep/oxidation resistance |
| Mo | 0.40 – 0.60 | Enhances high-temperature strength |
| Ni | ≤ 0.30 | Residual element |
| Cu | ≤ 0.30 | Residual element |
| Al (total) | ≤ 0.040 | Grain refining element, if added |
| N | ≤ 0.012 |
13CrMo4-5 Seamless Tube Thermal and Electrical Physical Properties
Typical physical properties for 13CrMo4-5 in the normalized and tempered condition. These values are representative of 1Cr-0.5Mo steels and are suitable for design calculations. Thermal expansion and conductivity data cover the operating temperature range.
| Property | Typical Value | Unit | Test Condition / Temperature |
|---|---|---|---|
| Density (ρ) | 7.85 | g/cm³ | 20 °C |
| Elastic Modulus (E) | 210 | GPa | 20 °C |
| Shear Modulus (G) | 81 | GPa | 20 °C |
| Poisson's Ratio (ν) | 0.3 | — | 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) | 40 | W/(m·K) | 20 °C |
| Thermal Conductivity (λ) | 42 | W/(m·K) | 200 °C |
| Thermal Conductivity (λ) | 37 | W/(m·K) | 400 °C |
| Specific Heat Capacity (cp) | 460 | J/(kg·K) | 20 °C |
| Electrical Resistivity (ρe) | 0.20 | μΩ·m | 20 °C |
13CrMo4-5 Seamless Tube Mechanical Properties
The following tensile and impact properties apply to seamless tubes in the normalized and tempered condition as per EN 10216-2. Values depend on wall thickness (t). Impact energy is measured on longitudinal Charpy V-notch specimens at +20 °C. Bend test requirements are also given.
| Property | Specified Value | Unit | Test Condition |
|---|---|---|---|
| Yield Strength (ReH) | ≥ 290 | MPa | t ≤ 16 mm |
| Yield Strength (ReH) | ≥ 280 | MPa | 16 < t ≤ 60 mm |
| Yield Strength (ReH) | ≥ 270 | MPa | 60 < t ≤ 100 mm |
| Tensile Strength (Rm) | 440 – 590 | MPa | Applicable to all thicknesses |
| Elongation (A) | ≥ 22 | % | t ≤ 40 mm, longitudinal gauge length 5.65√So |
| Elongation (A) | ≥ 21 | % | t > 40 mm, longitudinal |
| Impact Energy (KV2) | ≥ 40 | J | +20 °C, longitudinal, average of 3 specimens |
| Bend Test | No cracks | — | 180° bend; d=3t for t ≤ 10 mm, d=4t for t > 10 mm |
13CrMo4-5 Seamless Tube Fully Equivalent Material Standards and Substitutable Grades
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| European Union | EN 10216-2 | 13CrMo4-5 | Current standard |
| International | ISO 9329-2 | 13CrMo4-5 | Identical technical content |
| Germany | DIN 17175 | 13CrMo44 | Withdrawn, replaced by EN 10216-2 |
| France | NF A49-213 | 13CrMo4-5 | Equivalent |
| United Kingdom | BS 3059-2 | 620-460 | Obsolete, former British standard for 1Cr-0.5Mo tube |
| Italy | UNI 5462 | 14CrMo4-5 | Equivalent Cr-Mo grade |
13CrMo4-5 Seamless Tube Application Introduction
13CrMo4-5 is primarily used in power generation, petrochemical, and chemical processing industries for components exposed to temperatures up to about 550 °C. It offers a good balance of creep strength, fabricability, and cost. Design stresses should follow recognized pressure vessel codes (e.g., EN 13445, ASME Section II). Welding requires preheating (150–250 °C) and post-weld heat treatment (typically 630–700 °C) to restore toughness and reduce residual stresses. The steel is also suitable for bending, forging, and cold forming with subsequent heat treatment.
Product Applications: Superheater tubes, Reheater tubes, Economizer tubes, High-pressure steam piping, Heat exchanger tubes, Furnace tubes
Processed into products: Boiler tube panels, Tube sheets, Flanges, Headers, Expansion loops, High-pressure fittings, Reformer tubes (low–medium temperature)
Application industries: Power Generation, Petrochemical Industry, Oil & Gas, Chemical Processing, Boiler Manufacturing
13CrMo4-5 Seamless Tube Similar or Proximate Substitute Materials
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| USA | ASTM A335 / ASTM A213 | P12 / T12 | 1Cr-0.5Mo steel for pipes and tubes; similar creep resistance, slightly different C and Mn ranges |
| China | GB/T 5310 | 15CrMoG | Chinese boiler tube grade, very close chemical composition; used interchangeably in many applications |
| Japan | JIS G3458 | STPA12 | Japanese alloy steel pipe for high-temperature service, equivalent to P12 |
| USA | ASME SA-335 | Grade P12 | ASME boiler code material, can replace 13CrMo4-5 with engineering assessment |
Notes:
This steel complies with the Pressure Equipment Directive (PED) 2014/68/EU. Inspection certificates according to EN 10204 Type 3.1 or 3.2 are available. Surface condition can be hot-finished or cold-finished as agreed. Additional requirements such as hot tensile testing, creep rupture testing, or non-destructive testing (ultrasonic, eddy current) may be specified at the time of order. For sour service applications, further evaluation per NACE MR0175/ISO 15156 is advised.
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