25CrMo4 Seamless Cold Drawn Precision Steel Tube for Racing Applications
Product Details
25CrMo4 Precision Steel Tube
,Cold Drawn Seamless Tube
,Racing Application Precision Pipe
25CrMo4 Seamless Cold Drawn Precision Tube (EN 1.7218) for Racing & Motorsport
Material
This product is a seamless, cold-drawn precision steel tube made from 25CrMo4 (steel number 1.7218)—a chromium-molybdenum low-alloy, low-to-medium carbon steel designed for quenching and tempering to achieve an excellent strength-to-weight ratio, toughness, and fatigue resistance.
For racing and high-load mechanical parts, 25CrMo4 is widely used as an equivalent of SAE/AISI 4130 in many global supply chains.
Specifications
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Manufacturing route: hot-finished seamless mother tube → multi-pass cold drawing → sizing/straightening → cut to length → optional heat treatment.
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Outer diameter (OD): commonly 6–120 mm for motorsport structures; EN 10305-1 scope includes OD ≤ 380 mm.
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Wall thickness (WT): typically 0.8–12 mm (custom on request).
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Length: random or cut-to-length; defined length tolerances can be applied for exact lengths.
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Tolerance target: per EN 10305-1 / customer drawing; wall tolerance example ±10% or ±0.1 mm (whichever is greater) under certain ordering conditions.
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Surface: bright drawn / oiled; optional phosphated, pickled, or coated for storage and forming.
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Ends: plain, deburred, chamfered, bevelled; ID/OD cleaning available for precision assemblies.
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Delivery condition (examples): +C / +LC / +SR / +A / +N depending on forming vs. strength needs.
Main Features
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High strength-to-weight potential after Q&T (ideal for lightweight chassis and high-load parts).
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Excellent dimensional consistency from cold drawing for press-fit, CNC machining, and tight assemblies.
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Good weldability with correct practice, suitable for fabricated racing structures and brackets.
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Stable, clean bore and surface quality to reduce stress raisers and improve fatigue life in cyclic loading components.
Our Advantages
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“Will the tube meet tight tolerance and surface requirements for fabrication and machining?”
Yes. Precision tube standards emphasize defined tolerances and maximum surface roughness, and we manufacture with cold drawing + sizing and in-process gauging to support fit-critical parts (bushed joints, inserts, sleeving, etc.). -
“How do you ensure structural integrity and suitability for mechanical service?”
For mechanical tubing supply chains, buyers commonly specify standards such as ASTM A519 for seamless mechanical tubing (hot-finished or cold-finished) to ensure appropriate manufacturing control for mechanical applications.
We support: heat/lot traceability, chemical verification, tensile testing (as required), and optional NDT (eddy current / UT) aligned with precision-tube procurement practice. -
“Can I weld it for motorsport frames without cracking or distortion?”
Industry guidance for 4130-type tubing fabrication commonly highlights: clean prep, controlled heat input, and preheat/PWHT decisions based on thickness and restraint.
We can supply the tube in a fabrication-friendly condition (e.g., normalized/stress-relieved where specified) and provide welding notes to help your shop qualify a WPS for your wall thickness and sanctioning-body rules.
Chemical Composition
| Grade (Standard) | C | Si | Mn | P | S | Cr | Mo | Ni | Cu |
|---|---|---|---|---|---|---|---|---|---|
| 25CrMo4 (EN 10083-3) | 0.22–0.29 | ≤0.40 | 0.60–0.90 | ≤0.025 | ≤0.035 | 0.90–1.20 | 0.15–0.30 | — | — |
| 4130 (AMS / Bar/Tube limits) | 0.28–0.33 | 0.15–0.35 | 0.40–0.60 | ≤0.025 | ≤0.025 | 0.80–1.10 | 0.15–0.25 | ≤0.25 | 0.35 |
| SCM430 (JIS G 4053) | 0.28–0.33 | 0.15–0.35 | 0.60–0.90 | ≤0.030 | ≤0.030 | 0.90–1.20 | 0.15–0.30 | ≤0.25 | ≤0.30 |
| 30CrMo (GB/T 3077) | 0.26–0.33 | 0.17–0.37 | 0.40–0.70 | ≤0.030 | ≤0.030 | 0.80–1.10 | 0.15–0.25 | ≤0.30 | ≤0.30 |
| 30ХМ / 30KhM (GOST 4543) | 0.26–0.34 | 0.17–0.37 | 0.40–0.70 | ≤0.035 | ≤0.035 | 0.80–1.10 | 0.15–0.25 | ≤0.30 | ≤0.30 |
Mechanical Properties
| Grade | Example condition (reference) | Yield Strength (MPa) | Tensile Strength (MPa) | Elongation (%) | Hardness |
|---|---|---|---|---|---|
| 25CrMo4 (EN) | Q&T, small section | ≥700 | 900–1100 | ≥12 | — |
| 4130 (AMS tubing) | Tube AMS 6371, cold drawn | ≥483 | ≥655 | 12 | <25 (typ.) |
| SCM430 (JIS) | Q&T (example listed) | ≥785 | ≥930 | ≥12 | ≤229 HBW |
| 30CrMo (GB) | Q&T (example listed) | ≥785 | ≥930 | ≥12 | ≤229 HBW |
| 30ХМ / 30KhM (GOST) | Q&T (example listed) | ≥736 | ≥930 | ≥11 | — |
Standards (ASTM / EN / GOST / JIS / GB)
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EN: EN 10305-1 (seamless cold-drawn precision tubes; includes 25CrMo4 as an alloy option); EN 10083-3 (25CrMo4 material definition).
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ASTM: ASTM A519 (seamless carbon & alloy steel mechanical tubing, hot-finished or cold-finished).
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GOST: GOST 4543 (alloy construction steels; e.g., 30ХМ).
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JIS: JIS G 4053 (SCM series chemistry); JIS G 3441 (alloy steel tubes for machine purposes, includes SCM430TK).
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GB: GB/T 3077 (alloy structure steels; e.g., 30CrMo); GB/T 3639 (cold drawn precision seamless steel tubes, commonly used for “precision tube” procurement in China).
Application Areas
Typical industries: motorsport & racing, automotive performance, aerospace/defense structures, precision machinery, energy equipment.
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Racing / Motorsport: roll cage & chassis tubes, suspension links, subframe members, steering/sway components, reinforced sleeves/spacers.
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Automotive / Mechanical: shafts, axles, high-load pins, bush housings, machined sleeves, high-strength fastener sleeves.
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Aerospace-style fabrication: welded tubular structures where controlled properties and good weld practice are required.
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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