EN 1.7218 25CrMo4 Chromium-Molybdenum Precision Seamless Steel Tube for High-Strength Applications
Ürün Ayrıntıları
EN 1.7218 Precision Seamless Steel Tube
,25CrMo4 Chromium-Molybdenum Steel Tube
,Chromium-Molybdenum Precision Steel Tube
EN 1.7218 (25CrMo4) Precision Seamless Chromium-Molybdenum Steel Tube
Material
The grade 25CrMo4 (also designated EN 1.7218) is a high-quality chromium-molybdenum alloy steel developed for engineering applications requiring good hardenability, strength, toughness and weldability. It is fully suitable for precision seamless steel tubes through cold or hot forming processes. The material is often supplied in a quench & temper (QT) state, or in softened (annealed) condition for further processing.
Specifications
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Material grade: 25CrMo4 / EN 1.7218
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Product form: Precision seamless steel tube (cold drawn or hot finished)
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Delivery conditions: e.g., annealed (+A), quenched & tempered (+QT)
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Typical tube OD/WT: according to customer drawing/specification (for example precision tube OD X mm, wall thickness Y mm)
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Surface finish: as-drawn, peeled, turned, ground, or other precision finishing as requested
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Heat treatment: Hardening and tempering appropriate to tube size and application
Key Characteristics
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Excellent balance of strength and toughness: After quenching & tempering, tensile strength can reach 900–1100 MPa (depending on size) and yield strength in the 700 MPa range.
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Good hardenability through tube wall — makes it suitable for thicker walled tubes and critical parts.
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Good weldability and machinability for a quenched & tempered alloy steel.
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Precision tube production enables tight tolerances, smooth surfaces and improved performance for demanding applications (e.g., hydraulic cylinders, high-pressure tubes, structural shafts).
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Chromo-moly construction: the combination of Cr and Mo provides enhanced strength, creep resistance (for elevated temperatures) and good fatigue behaviour relative to plain carbon steels.
Our Advantages
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We supply these precision seamless tubes in fully controlled manufacturing: from steel melt to tube forming, heat treatment and finishing — ensuring traceability and consistent quality.
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We maintain strict chemical and mechanical property control to meet or exceed relevant standards (see below). For example, the 25CrMo4 chemical composition is precisely monitored: C 0.22-0.29 %, Cr 0.90-1.20 %, Mo 0.15-0.30 % etc.
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We understand the customer-concerns:
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Concern: Will the tube achieve the specified tensile and yield strengths after heat treatment? Our response: Yes — we provide certified mill test reports showing tensile strength ranges of ~800-950 MPa in many cases for QT condition for given diameter ranges.
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Concern: What about dimensional accuracy and surface finish for precision tubes? Our response: We specialize in cold-drawn and ground precision tubes with tight tolerances, minimizing further machining.
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Concern: How about weldability and machinability? Our response: 25CrMo4 provides good weldability for an alloy steel and is readily machined in the annealed condition; when QT treated we can still supply pre-machined tubes or near-net shapes as needed.
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Concern: Is the material sourcing and standard compliance assured? Our response: We supply full documentation, traceability and ensure compliance with applicable EN/ASTM/ISO standards (see “Standards” section).
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Customization: We can provide special finishes (peeling, grinding, straightening), custom lengths, and supply precision seamless tube ready for assembly or further processing — reducing customer cost and lead time.
Chemical Composition
Below is a table comparing five relevant alloy steel grades (including 25CrMo4) and showing their typical chemical composition ranges for key alloying elements.
| Grade | C (%) | Si (%) | Mn (%) | P (%) max | S (%) max | Cr (%) | Mo (%) |
|---|---|---|---|---|---|---|---|
| 25CrMo4 (1.7218) | 0.22-0.29 | ≤0.40 | 0.60-0.90 | ≤0.025 | ≤0.035 | 0.90-1.20 | 0.15-0.30 |
| 20CrMo4 | 0.17-0.23 | ≤0.40 | 0.60-0.90 | ≤0.02 | ≤0.01 | 0.90-1.20 | 0.15-0.25 |
| 30CrMo4 / 1.7220 | 0.30-0.37 | ≤0.40 | 0.60-0.90 | ≤0.035 | ≤0.035 | 0.90-1.20 | 0.15-0.30 |
| AISI 4130 (approx) | 0.28-0.33 | 0.15-0.35 | 0.40-0.60 | ≤0.035 | ≤0.040 | 0.80-1.10 | 0.15-0.25 |
| 34CrMo4 | 0.30-0.37 | ≤0.40 | 0.50-0.80 | ≤0.035 | ≤0.035 | 0.80-1.20 | 0.15-0.30 |
Note: The values shown are typical ranges or limits for general reference; actual specification should always refer to the appropriate standard and supplier certificate.
Mechanical Properties
Here is a comparative table listing typical mechanical property ranges for the same five grades (in temper/hardened states) for general guidance. Actual values for tubes will depend on wall thickness, heat treatment, size and referenced standard.
| Grade | Condition | Tensile strength Rm (MPa) | Yield strength Re or Rp0.2 (MPa) | Elongation A (%) | Hardness/HBW (max) |
|---|---|---|---|---|---|
| 25CrMo4 (1.7218) | QT (quenched & tempered) | ~900-1100 (to 1000-1200) | ~700 MPa (0.2% proof) | ~12-20 % depending on size | HBW ~255 max (+S) |
| 20CrMo4 | Q+T | Approx 650-880 MPa | 350-550 MPa | ~8-25 % | – |
| 30CrMo4 (1.7220) | Q+T | ~980 MPa or more | ≥785 MPa (yield) | ≥10 % | ≤269 HB (annealed) |
| AISI 4130 | Annealed / typical bar | ~560 MPa Rm quoted | ~460 MPa yield | ~21.5 % | HB ~217 |
| 34CrMo4 | QT | Rm 700-1200 MPa | Re/Rp0.2 ~450 MPa | ~11 % | HBW max ~255 |
Applicable Standards
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EN 10083-3: Alloy steels for quenching and tempering — 25CrMo4 (1.7218) is included.
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EN 10216-2: Seamless steel tubes for pressure purposes — non-alloy and alloy steel tubes with specified elevated temperature properties. 25CrMo4 appears as a grade for alloy steel tubes.
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EN 10297-1: Seamless circular steel tubes for mechanical and general engineering purposes (non-alloy and alloy steel tubes) — includes 25CrMo4.
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EN 10305-1: Steel tubes for precision applications — cold drawn seamless tubes. 25CrMo4 (1.7218) is listed.
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EN 10269: Steels and nickel alloys for fasteners with specified elevated/low temperature properties — 25CrMo4 listed.
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ISO 683-2 (and ISO 683-18): Heat-treatable steels, alloy steels and free-cutting steels — includes 25CrMo4.
Application Fields
General field: Precision seamless chromium-molybdenum steel tubes for mechanical engineering, automotive, hydraulics, power generation, oil & gas and structural applications.
In that field, typical uses of 25CrMo4 precision seamless tube include:
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Hydraulic cylinder rods and tubes (where strength and fatigue resistance are required)
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Transmission shafts, connecting rods, drive axles — high torsional and bending loads.
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Crankshafts, camshafts, spindles, gear shafts in heavy-duty machinery.
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High-pressure tubing in oil & gas, steam turbines, power plants — where elevated temperature strength and creep resistance are beneficial.
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Structural tube members subject to dynamic loads in the automotive, rail or aerospace sector (in the quenched & tempered condition).
Q: Are you trading company or manufacturer ?
A: manufacturer,also can do trading.
Q: How long is your delivery time?
A: Generally speaking,it is 10-15 days if the goods are in stock,or it is 30-40 days if the goods are not in stock,
it is according to quantity.
Q: Do you provide samples? is it free or extra ?
A: Yes, we could offer the sample for free charge but need pay the cost of freight.
Q: What is your terms of payment ?
A: Payment<=2000USD, 100% in advance. Payment>=2000USD, 30% T/T in advance ,balance before shippment.
If you have another question, pls feel free to contact with me.
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