41Cr4 Low Alloy Quenched & Tempered Seamless Precision Steel Tube with Tight OD/ID Tolerances for Engineering
41Cr4 Low Alloy Seamless Precision Steel Round Tube for Engineering
Material
41Cr4 (EN 1.7035) is a heat-treatable Cr-alloy steel commonly supplied in quenched & tempered (+QT) condition for engineering components that require a strong strength–toughness balance, stable hardenability, and reliable machining performance.
Specifications
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Product form: Seamless precision round tube (cold-drawn / cold-rolled as required)
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Delivery condition (typical options): +C / +LC (cold-finished), +SR (stress relieved), +A (annealed), +N (normalized), +QT (quenched & tempered)
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Dimensional & geometric requirements: Tight OD/ID/wall tolerances, concentricity, and straightness can be agreed (including reduced tolerances as options).
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Surface quality: Surface condition and roughness measurement can be specified as a purchasing option.
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Inspection & NDT options: Longitudinal imperfection NDT and leak-tightness verification can be specified; NDT personnel qualification requirements are stated.
Key Features
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High strength with good toughness after +QT heat treatment (well-suited for dynamic loads and fatigue-sensitive parts).
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Good hardenability and heat-treatment response, supporting consistent properties through section thickness in many engineering sizes.
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Precision-ready geometry from cold finishing for efficient machining and predictable fit-up in assemblies.
Our Advantages
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“Can you guarantee tight tolerances and surface finish for automated machining?”
Yes. Precision tube supply can follow EN 10305-1 options for reduced diameter/wall tolerances and even concentricity control, and roughness measurement can be specified contractually—ideal for CNC/robotic production lines. -
“How do you ensure property consistency lot-to-lot?”
We control steel chemistry and heat-treatment routes (+QT / +SR / +N as agreed) and verify by tensile testing, dimensional inspection, and (when required) NDT per EN 10305-1 inspection/testing structure. -
“What documents and traceability will we receive for audits?”
We can provide inspection documentation aligned with EN 10204 pathways referenced in EN 10305-1 (e.g., test report 2.2 by default; 3.1 certificates when specific inspection is requested), including chemistry and mechanical test identifiers for traceability.
Chemical Composition
| Grade | Standard / Steel No. | C | Si | Mn | P (max) | S (max) | Cr | Mo |
|---|---|---|---|---|---|---|---|---|
| 41Cr4 | EN 1.7035 | 0.38–0.45 | 0.10–0.40 | 0.60–0.90 | 0.025 | 0.035 | 0.90–1.20 | — |
| 25CrMo4 | EN 1.7218 | 0.22–0.29 | ≤0.40 | 0.60–0.90 | 0.025 | 0.035 | 0.90–1.20 | 0.15–0.30 |
| 34CrMo4 | EN 1.7220 | 0.30–0.37 | ≤0.40 | 0.60–0.90 | 0.025 | 0.035 | 0.90–1.20 | 0.15–0.30 |
| 42CrMo4 | EN 1.7225 | 0.38–0.45 | 0.10–0.40 | 0.60–0.90 | 0.025 | 0.035 | 0.90–1.20 | 0.15–0.30 |
| AISI 4140 | (ASTM/SAE) | 0.38–0.43 | 0.20–0.35 | 0.75–1.00 | <0.035 | <0.040 | 0.80–1.10 | 0.15–0.25 |
Mechanical Properties
| Grade | Condition (example) | Size basis | Yield / Rp0.2 (MPa) | Tensile Rm (MPa) | Elongation A (%) | Impact (J) |
|---|---|---|---|---|---|---|
| 41Cr4 | +QT | 16 < d ≤ 40 mm | ≥660 | 900–1100 | ≥12 | KVRT ≥35 |
| 25CrMo4 | +QT | 16–40 mm | Rp0.2 ≈600 | 800–950 | (typ.) ≥14 (Lo=5.65√So) | KV (L) 45–50 |
| 34CrMo4 | +QT | 16–40 mm | Rp0.2 ≈650 | 900–1100 | (typ.) ≥12 (Lo=5.65√So) | KV (L) 35–45 |
| 42CrMo4 | +QT | 16 < d ≤ 40 mm | ≥750 | 1000–1200 | ≥12 | KV2 ≥35 |
| AISI 4140 | Hot rolled (per ASTM A519 listing) | — | 621 | 855 | 15 | — |
Standards
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EN (Precision & engineering tubes): EN 10305-1 (precision cold-drawn tubes; tolerances, options, inspection framework).
EN (Material family): 41Cr4 is typically referenced under EN heat-treatable alloy steel systems (e.g., EN/ISO 683-2 family in datasheet practice). -
ASTM (Mechanical tubing): ASTM A519 (seamless carbon & alloy steel mechanical tubing, hot-finished or cold-finished).
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GOST (Alloy structural steels): GOST 4543-2016 (structural alloy steel products—specifications).
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JIS (Alloy steels system): JIS G 4053 (low-alloyed steels for machine structural use; note: the document states it is not applicable to steel tubes and points to JIS tube standards separately).
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GB (Alloy structural steels / precision tubes): GB/T 3077 (Alloy structure steels) and GB/T 3639 (seamless cold-drawn or cold-rolled steel tubes for precision applications).
Application Areas
Typical industries: mechanical engineering, automotive components, hydraulics & power transmission, general machinery.
Where the tube is used (examples):
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Power transmission: shafts, torque tubes, couplings, spline sleeves (high torsional strength need).
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Machinery structures: precision bushings, sleeves, spacers, structural members requiring tight ID/OD fit.
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Tooling & wear parts: rollers, pins, guides (often with +QT then machining; optional surface hardening depending on design).
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.
Get in Touch
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