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EN 10216-2 10CrMo5-5 Seamless Steel Tube
EN 10216-2 10CrMo5-5 / 1.7338 Seamless Alloy Steel Tube for Elevated-Temperature Pressure Service
Xi'an Dongmeng Group Co., Ltd. supplies EN 10216-2 10CrMo5-5 seamless steel tubes, material number 1.7338, for pressure equipment, boiler systems, steam piping and other elevated-temperature industrial applications.
10CrMo5-5 is a chromium-molybdenum alloy steel designed for applications where carbon steel may not provide sufficient strength at elevated temperature. Its controlled chromium and molybdenum content supports elevated-temperature mechanical performance, while the seamless manufacturing route makes it suitable for demanding pressure-service applications.
For project procurement, Dongmeng Group can supply tubes according to specified outside diameter, wall thickness, length, heat-treatment condition, testing category and inspection-document requirements. Material traceability and inspection documentation can be incorporated into the purchase specification.
The current EN 10216-2 standard requires tubes covered by this part to be produced by a seamless process; they may be hot- or cold-finished before the specified final heat treatment.
What Is EN 10216-2 10CrMo5-5?
EN 10216-2 covers seamless steel tubes for pressure purposes made from non-alloy and alloy steels with specified elevated-temperature properties. The standard covers technical delivery requirements including manufacture, chemical composition, heat treatment, mechanical properties, dimensions, inspection and testing.
10CrMo5-5, steel number 1.7338, belongs to the Cr-Mo alloy steel group.
Compared with conventional carbon pressure-tube grades, the addition of chromium and molybdenum makes 10CrMo5-5 more suitable for applications involving prolonged exposure to elevated temperatures and pressure.
Typical procurement sectors include power generation, industrial boilers, steam systems, process plants and high-temperature pressure equipment.
Quick Product Identification
| Item | Specification |
|---|---|
| Product | Seamless Alloy Steel Tube |
| Standard | EN 10216-2 |
| Steel Grade | 10CrMo5-5 |
| Material Number | 1.7338 |
| Material Family | Chromium-Molybdenum Alloy Steel |
| Manufacturing | Seamless |
| Delivery Condition | Normally +NT |
| Primary Service | Elevated-Temperature Pressure Applications |
| Inspection | According to ordered test category and project specification |
| Documentation | EN 10204 inspection documentation available as specified |
| Supplier | Xi'an Dongmeng Group Co., Ltd. |
Chemical Composition of 10CrMo5-5
According to EN 10216-2:2024, the cast-analysis limits for 10CrMo5-5 / 1.7338 are as follows.
| Element | EN 10216-2:2024 Requirement, % |
|---|---|
| C | ≤ 0.15 |
| Si | 0.50–1.00 |
| Mn | 0.30–0.60 |
| P | ≤ 0.025 |
| S | ≤ 0.010 |
| Cr | 1.00–1.50 |
| Mo | 0.45–0.65 |
| Ni | ≤ 0.30 |
| Al total | ≤ 0.040 |
| Cu | ≤ 0.30 |
Why Chromium and Molybdenum Matter
Chromium contributes to oxidation resistance and high-temperature stability, while molybdenum supports strength retention at elevated temperature.
However, alloy content alone should never be used to establish a safe operating temperature or pressure. Final design conditions must be determined according to the applicable pressure-vessel or piping design code, tube dimensions, design life, stress limits and operating environment.
Heat Treatment: +NT Condition
A major procurement point for EN 10216-2 10CrMo5-5 tube is its heat-treatment condition.
The current EN 10216-2:2024 table specifies 10CrMo5-5 / 1.7338 in +NT condition, meaning normalizing followed by tempering. The indicated treatment ranges are:
| Process | Requirement |
|---|---|
| Delivery Condition | +NT |
| Austenitizing / Normalizing Temperature | 900–960°C |
| Cooling after Normalizing | Air |
| Tempering Temperature | 650–750°C |
| Cooling after Tempering | Air |
An important detail often missing from basic supplier pages is that the standard includes a qualification for certain +NT grades: depending on wall thickness and the T/D ratio, quenching and tempering may be necessary to obtain the required structure and material properties. This should therefore be reviewed during the enquiry and order stage rather than assumed solely from a generic catalogue description.
That distinction is particularly relevant when purchasing heavy-wall tubes.
Mechanical Properties
Typical standard values for 10CrMo5-5 include a tensile-strength range of 410–560 MPa. The minimum room-temperature yield/proof strength varies with wall thickness; commonly published EN 10216-2 data specify 275 MPa up to 40 mm wall thickness and 265 MPa for wall thickness above 40 mm up to 60 mm. Longitudinal elongation is typically at least 22%, with transverse elongation at least 20%.
| Property | 10CrMo5-5 |
|---|---|
| Tensile Strength Rm | 410–560 MPa |
| Yield / Proof Strength, T ≤16 mm | ≥275 MPa |
| Yield / Proof Strength, 16 < T ≤40 mm | ≥275 MPa |
| Yield / Proof Strength, 40 < T ≤60 mm | ≥265 MPa |
| Longitudinal Elongation | ≥22% |
| Transverse Elongation | ≥20% |
| Longitudinal Impact Energy at 20°C | ≥40 J |
| Transverse Impact Energy at 20°C | ≥27 J |
Engineering note: mechanical-property requirements should always be checked against the specific EN 10216-2 edition, tube dimensions, heat-treatment condition and purchase specification rather than copied from a generic material table.
Manufacturing Route
EN 10216-2 requires tubes under this standard to be manufactured by a seamless process. Unless otherwise specified, the tube can be hot-finished or cold-finished before final heat treatment.
A typical production and supply route is:
Raw Material Verification → Billet Heating → Piercing → Hot Rolling / Sizing → Optional Cold Finishing → Heat Treatment → Straightening → Dimensional Inspection → Mechanical Testing → NDT / Leak-Tightness Testing as Specified → Marking → Documentation → Packing
For critical pressure-service orders, the purchasing specification should clearly define whether a hot-finished or cold-finished route is required.
Size and Supply Capability
Dongmeng Group can quote EN 10216-2 10CrMo5-5 seamless tubes according to project dimensions rather than limiting customers to a single catalogue size range.
For an accurate quotation, the recommended format is:
OD × Wall Thickness × Length × Quantity
For example:
168.3 mm OD × 12.5 mm WT × 6,000 mm L
Where dimensional tolerance, minimum wall, inside diameter or machining allowance is critical, these requirements should be specified directly in the RFQ.
This is particularly important for tubes that will subsequently be bent, machined, welded into pressure assemblies or used in critical steam-service systems.
Inspection and Quality Documentation
For pressure-service Cr-Mo tubing, purchasing only by grade name is not sufficient. Inspection scope should be defined at the RFQ stage.
| Procurement Requirement | Available / To Be Specified |
|---|---|
| Heat Number Traceability | Yes |
| Chemical Analysis | According to specification |
| Tensile Test | According to EN 10216-2 |
| Impact Testing | Where required by grade/order |
| Dimensional Inspection | OD, WT, length and tolerance |
| Surface Inspection | Visual / specified inspection |
| NDT | According to applicable test category/order |
| Leak-Tightness Test | According to ordered requirement |
| EN 10204 Certificate | Specify required document type |
| Third-Party Inspection | Can be arranged where agreed |
| Special Marking | Project marking available by agreement |
EN 10216-2 itself provides two test categories, which is why buyers should specify the required testing and documentation rather than simply writing "EN 10216-2 tube" on the purchase order.
Typical Applications
EN 10216-2 10CrMo5-5 seamless tubes are commonly selected for industrial systems where both pressure and elevated temperature must be considered.
| Industry | Typical Application |
|---|---|
| Power Generation | Steam and high-temperature piping |
| Boiler Systems | Boiler pressure components and connecting tubes |
| Petrochemical Plants | High-temperature process piping |
| Refineries | Hot process and pressure-service systems |
| Chemical Processing | Elevated-temperature pressure lines |
| Industrial Plants | Heat and pressure equipment |
| Pressure Equipment | Tubular components subject to design-code approval |
| Energy Projects | Cr-Mo alloy piping systems |
Actual suitability must be confirmed against the operating pressure, metal temperature, corrosion environment, design life and applicable engineering code.
10CrMo5-5 vs. ASTM Cr-Mo Grades
Purchasers frequently compare 10CrMo5-5 / 1.7338 with ASTM/ASME chromium-molybdenum materials such as ASTM A335 P11 or ASTM A213 T11.
They belong to a similar Cr-Mo alloy family, but they should not automatically be treated as interchangeable grades.
EN and ASTM/ASME specifications differ in areas such as product form, chemical limits, dimensional requirements, heat treatment, testing, certification and design-code acceptance.
For a substitution request, Dongmeng Group recommends comparing:
| Comparison Point | Why It Matters |
|---|---|
| Chemical Composition | Similar does not mean identical |
| Heat Treatment | Influences final microstructure and properties |
| Mechanical Properties | Must satisfy design specification |
| Product Standard | Pipe/tube requirements may differ |
| Design Code | Determines whether substitution is permitted |
| Inspection Requirement | Project documentation may differ |
Substitution should therefore be approved by the responsible engineer or equipment designer.
Welding and Fabrication Considerations
10CrMo5-5 is a Cr-Mo alloy steel and requires more controlled welding procedures than ordinary carbon steel.
The WPS should consider material thickness, joint restraint, welding process, filler-metal classification, heat input, preheat/interpass temperature and post-weld heat treatment requirements.
For critical pressure equipment, the appropriate procedure should be supported by WPS/PQR qualification and the relevant construction code.
Fixed preheat or PWHT temperatures should not be copied from a generic material webpage because required values may vary according to thickness, welding consumables, service conditions and the governing design code.
This kind of information is important to include on the page because it demonstrates to technical buyers that the material is being treated as an engineered pressure material rather than simply as a commodity steel pipe.
How to Specify 10CrMo5-5 Tubes in an RFQ
For faster technical review and quotation, an RFQ should ideally contain the following information:
Standard: EN 10216-2
Grade: 10CrMo5-5 / 1.7338
Dimensions: OD × WT
Length: fixed, random or cut length
Quantity: metres, pieces or tonnes
Delivery condition: +NT or project-specified condition
Test category: as required
Inspection certificate: required EN 10204 document type
NDT / supplementary tests: if applicable
End finish, marking, packing and third-party inspection requirements
This information allows the mill route, inspection requirement and commercial quotation to be reviewed together rather than correcting technical requirements after an order has been placed.
Why Choose Dongmeng Group for 10CrMo5-5 Tubes?
Xi'an Dongmeng Group Co., Ltd. focuses on project-oriented industrial metal supply rather than simply offering generic catalogue material.
For EN 10216-2 10CrMo5-5 projects, our sourcing and quality workflow can be aligned with the customer's required dimensions, heat treatment, inspection documents, testing scope, marking and packing requirements.
For critical boiler, power-generation and process-piping projects, customers may submit the technical purchase specification together with the RFQ. Our team can review key procurement parameters before order confirmation to reduce the risk of grade, dimensional or documentation mismatch.
FAQ – EN 10216-2 10CrMo5-5 Seamless Steel Tube
What material is 10CrMo5-5?
10CrMo5-5 is a chromium-molybdenum alloy steel with material number 1.7338, specified under EN 10216-2 for seamless pressure tubes with elevated-temperature properties.
Is 10CrMo5-5 a seamless or welded tube grade?
For an EN 10216-2 product, the tube is manufactured by a seamless process. The current standard specifically defines this part for seamless tubes.
What is the normal delivery condition?
The normal specified condition for 10CrMo5-5 is +NT, normalized and tempered, with normalizing at 900–960°C and tempering at 650–750°C.
What is the EN material number for 10CrMo5-5?
The material number is 1.7338.
Is 10CrMo5-5 the same as ASTM A335 P11?
They are often compared because both are Cr-Mo materials, but they should not be declared automatically interchangeable. Substitution should be based on a complete comparison of the relevant EN and ASTM/ASME requirements and approved by the responsible engineer.
Can 10CrMo5-5 be used for high-temperature steam piping?
It is designed for elevated-temperature pressure applications and is used in boiler and steam-related systems. However, allowable operating temperature and pressure must be determined by the applicable design code and project conditions rather than by grade name alone.
Can you supply an EN 10204 3.1 certificate?
Inspection documentation can be included according to the purchase specification. Buyers should state the required EN 10204 certificate type when sending the RFQ.
Can the tube be supplied with NDT?
Yes, testing can be arranged according to the applicable EN 10216-2 test category and the agreed purchase specification.
Can heavy-wall 10CrMo5-5 tubes be supplied?
Heavy-wall requirements should be reviewed according to OD, wall thickness, T/D ratio and final mechanical-property requirements. The EN 10216-2 heat-treatment provisions make this especially important for heavier-wall material.
What information should I send for a quotation?
Send the required standard, grade, OD, wall thickness, length, quantity, delivery condition, inspection certificate, testing requirements and destination. This allows both technical and commercial requirements to be checked before quotation.
Contact Xi'an Dongmeng Group Co., Ltd.
For EN 10216-2 10CrMo5-5 Seamless Steel Tube / 1.7338 enquiries, send your tube schedule, BOM or technical purchase specification for review.
Xi'an Dongmeng Group Co., Ltd.
Phone: +86 157 6921 4734
Email: office@dongmjd.com
WhatsApp: Dong, +86 157 6921 4734
Office: Room 4107, Runfeng Building, Sanqiao New Street, Weiyang District, Xi'an City, Shaanxi Province
Recommended RFQ format:
EN 10216-2 / 10CrMo5-5 / OD × WT × Length / Quantity / Test Category / Certificate / NDT / Delivery Destination
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