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EN 10216-2 13CrMo4-5 Seamless Steel Tube
Xi'an Dongmeng Group Co., Ltd. supplies EN 10216-2 13CrMo4-5 Seamless Steel Tube for boilers, steam systems, pressure equipment, power plants, refineries and other elevated-temperature pressure applications. 13CrMo4-5, material number 1.7335, is a chromium-molybdenum alloy steel designed to retain mechanical strength at elevated temperatures while providing better heat resistance than conventional carbon steel pressure tubes.
Manufactured by a seamless process and normally supplied in the specified heat-treated condition, 13CrMo4-5 tubes can be supplied with project-specific outside diameter, wall thickness, length, end preparation, NDT, elevated-temperature testing and EN 10204 inspection documentation.
The current European standard is EN 10216-2:2024, which covers seamless non-alloy and alloy steel tubes with specified elevated-temperature properties for pressure purposes.
EN 10216-2 13CrMo4-5 Tube Specifications
| Item | Specification |
| Product | EN 10216-2 13CrMo4-5 Seamless Steel Tube |
| Standard | EN 10216-2:2024 |
| Grade | 13CrMo4-5 |
| Material Number | 1.7335 |
| Material Type | Cr-Mo Alloy Special Steel |
| Manufacturing | Seamless |
| Tube Condition Before Heat Treatment | Hot Finished or Cold Finished |
| Standard Delivery Condition | +NT - Normalized and Tempered |
| Austenitizing Temperature | 900–960°C |
| Tempering Temperature | 660–730°C |
| Surface | Black / Shot Blasted / Project Specified |
| Ends | Plain / Beveled / Special Machined Ends |
| Length | Random / Fixed / Project-Specified |
| Inspection | Chemical, Mechanical, Dimensional, Leak-Tightness, NDT as specified |
| Documentation | EN 10204 3.1 / 3.2 where ordered |
| Applications | Boiler, Steam Piping, Pressure Equipment, Power & Petrochemical Systems |
EN 10216-2 requires these tubes to be manufactured by a seamless process. They may be hot- or cold-finished before final heat treatment. For 13CrMo4-5, the standard delivery condition is +NT, with normalizing at 900–960°C followed by tempering at 660–730°C.
What Is 13CrMo4-5 Steel?
13CrMo4-5 is a European chromium-molybdenum creep-resistant alloy steel used in pressure equipment exposed to elevated temperatures.
Its EN material number is:
1.7335
The combination of approximately 0.70–1.15% chromium and 0.40–0.60% molybdenum improves high-temperature strength and oxidation resistance compared with ordinary carbon pressure steels.
Typical applications include:
steam-generating equipment;
boiler tubes and headers;
high-temperature pressure piping;
heat exchangers;
refinery process piping;
petrochemical equipment;
pressure vessels;
power-generation systems.
13CrMo4-5 should be selected from the actual design pressure, design temperature, wall thickness, welding procedure and governing pressure-equipment code rather than from a generic temperature rating alone.
Chemical Composition of 13CrMo4-5
According to the current EN 10216-2 material requirements, the typical ladle-analysis limits are:
| Element | Requirement (%) |
| Carbon C | 0.10–0.17 |
| Silicon Si | ≤ 0.35 |
| Manganese Mn | 0.40–0.70 |
| Phosphorus P | ≤ 0.025 |
| Sulfur S | ≤ 0.010 |
| Chromium Cr | 0.70–1.15 |
| Molybdenum Mo | 0.40–0.60 |
| Nickel Ni | ≤ 0.30 |
| Copper Cu | ≤ 0.30 |
| Total Aluminum | ≤ 0.040 |
These current values are reflected in the EN 10216-2 material data published by Mannesmann for 13CrMo4-5.
Why Cr and Mo Matter
Chromium improves oxidation resistance and hardenability at elevated temperature.
Molybdenum helps maintain strength under prolonged thermal loading and improves resistance to creep deformation.
This makes 13CrMo4-5 more suitable than ordinary carbon steel tubes for long-term elevated-temperature pressure service.
Mechanical Properties
For 13CrMo4-5 tubes under EN 10216-2, room-temperature properties depend partly on wall thickness.
| Wall Thickness T | Minimum Yield / Proof Strength | Tensile Strength |
| T ≤ 16 mm | 290 MPa | 440–590 MPa |
| 16 < T ≤ 40 mm | 290 MPa | 440–590 MPa |
| 40 < T ≤ 60 mm | 280 MPa | 440–590 MPa |
Minimum elongation:
Longitudinal: 22%
Transverse: 20%
Impact energy at 20°C:
Longitudinal: 40 J
Transverse: 27 J
These figures are given in the current EN 10216-2:2024 mechanical-property table.
For heavy-wall or special dimensions outside the tabulated property range, the exact requirements should be confirmed during technical review.
Elevated-Temperature Strength
One reason buyers specify 13CrMo4-5 rather than a standard carbon pressure tube is its defined elevated-temperature strength.
For wall thickness up to 60 mm, EN 10216-2 lists the following minimum Rp0.2 proof-strength values:
| Temperature | Minimum Rp0.2 |
| 100°C | 264 MPa |
| 150°C | 253 MPa |
| 200°C | 245 MPa |
| 250°C | 236 MPa |
| 300°C | 192 MPa |
| 350°C | 182 MPa |
| 400°C | 174 MPa |
| 450°C | 168 MPa |
| 500°C | 166 MPa |
EN 10216-2 allows verification of elevated-temperature properties to be specified at the enquiry and order stage.
Important Procurement Note
The fact that EN 10216-2 publishes material-property data up to a certain temperature does not mean that every 13CrMo4-5 tube automatically has that temperature as its allowable design limit.
Allowable service temperature and pressure must be determined according to:
design code + pressure + wall thickness + allowable stress + process medium + creep life + corrosion allowance + fabrication history.
This distinction is especially important for boiler, steam and refinery projects.
Heat Treatment - 13CrMo4-5 +NT
The standard delivery condition for 13CrMo4-5 is:
13CrMo4-5 +NT
Normalizing:
900–960°C, air cooling
Tempering:
660–730°C, air cooling
The +NT condition helps establish the microstructure and mechanical properties required for elevated-temperature service.
Heavy-Wall Tube Consideration
EN 10216-2 also notes that for certain grades, including this group of Cr-Mo materials, quenching and tempering (+QT) may become necessary for thicker sections or high T/D ratios to achieve the required structure and properties. The exact condition should therefore be agreed during enquiry and ordering when heavy-wall tubes are involved.
This is an important point for buyers purchasing heavy-wall boiler headers or pressure piping.
Seamless Manufacturing Process
A typical EN 10216-2 13CrMo4-5 seamless tube production route includes:
1. Alloy Steel Billet Verification
Raw material chemistry and heat identification are checked before production.
2. Billet Heating
The billet is heated to the required piercing and forming temperature.
3. Rotary Piercing
The solid billet is pierced to produce a hollow shell.
4. Hot Rolling / Elongation
The hollow is rolled to control outside diameter and wall thickness.
5. Sizing
The tube is sized to the required dimensional range.
6. Heat Treatment
13CrMo4-5 is normally normalized and tempered according to EN 10216-2.
7. Straightening
The heat-treated tube is straightened before inspection.
8. Cutting and End Preparation
Tubes can be supplied in fixed lengths and with plain or beveled ends.
9. Inspection & Testing
Mechanical, dimensional, leak-tightness and specified nondestructive testing are completed.
10. Identification and Documentation
Heat numbers, material identification and inspection documents are checked before packing.
Because the manufacturing route is seamless, there is no longitudinal weld seam, an important distinction when comparing the product with welded pressure pipe.
Inspection and Testing
For pressure-service Cr-Mo tubes, buyers should focus not only on chemistry but also on traceability and inspection.
Project inspection can include:
Chemical Analysis · Tensile Testing · Impact Testing · Elevated-Temperature Tensile Verification · Dimensional Inspection · Wall Thickness Measurement · Hydrostatic or Approved Leak-Tightness Testing · Ultrasonic Examination · PMI · Surface Inspection · Heat Number Traceability
The current EN 10216-2 also references modern EN ISO 10893 methods for nondestructive testing of steel tubes.
EN 10204 Inspection Documents
Depending on project requirements, documentation may include:
EN 10204 3.1
or
EN 10204 3.2
A 3.2 certificate can be specified as an ordering option under EN 10216-2.
For power-plant and pressure-equipment projects, the RFQ should clearly identify the required inspection document before production.
Typical Applications
Boiler Systems
13CrMo4-5 is widely associated with elevated-temperature pressure components including boiler tubes, headers and steam-carrying systems.
Power Generation
Typical uses include:
main and auxiliary steam piping, boiler pressure circuits, high-temperature process tubes and power-generation equipment.
Petrochemical & Refinery
Cr-Mo seamless tubes may be selected for process equipment requiring higher elevated-temperature strength than ordinary carbon steels.
Pressure Vessels
13CrMo4-5 is also part of a broader European Cr-Mo material family used for pressure-vessel and pressure-equipment fabrication.
Heat Exchangers
It can be considered for high-temperature heat-transfer service where the mechanical and process design supports its use.
13CrMo4-5 vs 16Mo3 vs 10CrMo9-10
Buyers frequently need to choose between these three EN 10216-2 grades.
| Property | 16Mo3 | 13CrMo4-5 | 10CrMo9-10 |
| Material No. | 1.5415 | 1.7335 | 1.738 |
| Alloy Type | Mo Steel | Cr-Mo | Higher Cr-Mo |
| Cr | - | 0.70–1.15% | Higher |
| Mo | Moderate | 0.40–0.60% | Higher |
| Tensile Strength | 450–600 MPa | 440–590 MPa | 480–630 MPa |
| Standard Delivery | +N | +NT | +NT |
| Typical Position | Lower-alloy high-temperature service | Intermediate Cr-Mo service | Higher-alloy elevated-temperature service |
The correct choice should be determined by design code and service conditions rather than simply selecting the grade with the highest alloy content.
EN 10216-2 13CrMo4-5 vs ASTM A335 P12
13CrMo4-5 is frequently cross-referenced with ASTM A335 P12 because both are roughly 1Cr-0.5Mo Cr-Mo seamless steels used for elevated-temperature pressure applications. Material databases also list A335 P12 as a common cross-reference for 13CrMo4-5.
However:
13CrMo4-5 is not automatically interchangeable with ASTM A335 P12.
| Item | EN 10216-2 13CrMo4-5 | ASTM A335 P12 |
| Standard System | European EN | ASTM / ASME |
| Material | 13CrMo4-5 | P12 |
| Material No. | 1.7335 | UNS K11562 |
| Product | Seamless Pressure Tube | Seamless High-Temperature Pipe |
| Cr-Mo Family | Approx. 1Cr-0.5Mo | Approx. 1Cr-0.5Mo |
| Main Use | Boiler / Pressure / Steam Tube | High-Temperature Process Pipe |
| Direct Substitution | No - engineering approval required | No - engineering approval required |
The specifications differ in chemistry limits, mechanical requirements, dimensional conventions, heat-treatment rules, testing and certification.
A customer specification calling for EN 10216-2 13CrMo4-5 should therefore not be changed to P12 solely because the grades appear on an equivalence chart.
Ordering Information - What Should Be Included in the RFQ?
For accurate quotation, provide:
Standard: EN 10216-2:2024
Grade: 13CrMo4-5 / 1.7335
Delivery Condition: +NT or project requirement
Outside Diameter: ___ mm
Wall Thickness: ___ mm
Length: ___ mm
Quantity: ___ pcs / m / tons
Exact Length: Yes / No
End Preparation: PE / BE / Special
NDT: ___
Leak-Tightness Requirement: ___
Impact Test: Required / Not Required
Elevated-Temperature Test: Required / Not Required
PMI: Required / Not Required
Certificate: EN 10204 3.1 / 3.2
Third-Party Inspection: If required
Application: Boiler / Steam / Refinery / Pressure Equipment
Design Code: ___
EN 10216-2 itself emphasizes that quantity, dimensions and grade designation must be defined at the enquiry and order stage, with additional inspection and testing requirements specified as options when needed.
Why Source 13CrMo4-5 Tube from Xi'an Dongmeng Group Co., Ltd.?
Xi'an Dongmeng Group Co., Ltd. supports B2B procurement of alloy steel tubes for power, boiler, petrochemical and engineering applications.
Standards-Based Material Supply
Material specifications can be reviewed against the ordered EN standard, grade, dimensional requirement and delivery condition.
Heat Number Traceability
Heat identification and inspection documents can be coordinated to maintain traceability from material to finished tube.
Inspection Support
PMI, UT, hydrostatic or other specified testing and third-party inspection can be arranged according to the agreed purchase specification.
Project Processing
Fixed-length cutting, beveling, surface preparation and project-specific packing can be coordinated where required.
Technical RFQ Review
For pressure-service tubes, we recommend checking the grade, wall thickness, delivery condition, NDT, certificate and end preparation before final quotation rather than quoting only from a product name.
FAQ - EN 10216-2 13CrMo4-5 Seamless Steel Tube
1. What is EN 10216-2 13CrMo4-5?
13CrMo4-5 is a chromium-molybdenum alloy steel grade, material number 1.7335, specified under EN 10216-2 for seamless pressure tubes with elevated-temperature properties.
2. Is 13CrMo4-5 seamless or welded?
EN 10216-2 specifies a seamless manufacturing process.
3. What is the material number of 13CrMo4-5?
The EN material number is 1.7335.
4. What is the standard heat-treatment condition?
13CrMo4-5 is normally supplied normalized and tempered (+NT) under EN 10216-2.
5. What are the heat-treatment temperatures?
The current standard specifies 900–960°C for normalizing and 660–730°C for tempering.
6. What is the tensile strength of 13CrMo4-5?
The specified room-temperature tensile-strength range is 440–590 MPa for the tabulated tube thicknesses.
7. Is 13CrMo4-5 equivalent to ASTM A335 P12?
They are commonly treated as comparable Cr-Mo material families, but they are not directly interchangeable standards. Chemical limits, testing, heat treatment and dimensional requirements must be checked before substitution.
8. Can 13CrMo4-5 be used at 500°C?
EN 10216-2 publishes elevated-temperature proof-strength data through 500°C for this grade, but actual allowable service conditions must be determined from the governing design code and project calculations.
9. Can EN 10204 3.2 certification be supplied?
Yes, EN 10216-2 provides 3.2 inspection certification as an ordering option.
10. Can ultrasonic testing be specified?
Yes. EN 10216-2 incorporates nondestructive testing requirements and options using relevant EN ISO 10893 standards.
11. Can you supply fixed-length tubes?
Exact-length supply can be specified during enquiry and ordering.
12. What information should I send for quotation?
Send the grade, OD, wall thickness, length, quantity, +NT/+QT requirement if applicable, NDT, inspection certificate and application.
Request a Quote
For EN 10216-2 13CrMo4-5 Seamless Steel Tube, send your tube schedule, MTO or project specification to Xi'an Dongmeng Group Co., Ltd.
We recommend providing:
OD × WT × Length · Quantity · Delivery Condition · NDT · Certificate · Application · Destination
Office Information
Phone: +86 157 6921 4734
Email: office@dongmjd.com
WhatsApp: Dong: +86 157 6921 4734
Office Address:
Room 4107, Runfeng Building, Sanqiao New Street, Weiyang District, Xi'an City, Shaanxi Province
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