ASTM A513 4130 Chromoly Cold Drawn Alloy Steel Precision (DOM) Tube / Pipe for Mechanical Engineering
Material
This product is ASTM A513/A513M Grade 4130 chromium–molybdenum (Chromoly) mechanical tubing manufactured by the ERW → Drawn-Over-Mandrel (DOM) → cold drawing route. ASTM A513 Type 5 DOM tubing is produced from electric-resistance-welded tube that is subsequently cold drawn over a mandrel to achieve high dimensional accuracy, improved concentricity, and a smooth bore (often described as “near-seamless” in finish, though it is not made from a solid billet).
Specifications
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Product form: Round / square / rectangular / special-shaped mechanical tubing (DOM)
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Typical OD range: 6–219 mm (custom sizes available)
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Typical wall thickness: 0.5–20.0 mm (custom thickness available)
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Length: Random length or cut-to-length (as agreed)
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Delivery conditions (common options): As-welded, normalized, DOM, DOM stress relieved
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Surface: Black / oiled / bright (pickled & oiled), optional coatings on request
Main Features
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Precision OD/ID and improved concentricity after DOM cold drawing (excellent for machining and tight-fit assemblies)
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Smooth internal surface & reduced wall variation, supporting stable performance in mechanical motion and load-bearing parts
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4130 Chromoly strength-to-weight advantage, enabling lighter designs vs. plain carbon steels in many structural parts
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Heat-treatable (normalized or quenched & tempered) to match required strength/toughness targets
Our Advantages
Q1: “Is DOM really comparable to seamless for my application?”
A: DOM made to ASTM A513 is widely specified because its wall uniformity and concentricity are excellent, and its properties are often described as comparable to cold-drawn seamless of similar chemistry/size. For strict “true seamless” requirements, we can offer a seamless option by request (e.g., ASTM A519).
Q2: “Will I spend less time machining?”
A: DOM tubing is commonly chosen because its surface finish, straight bore, and minimized wall variation can reduce stock removal, shorten machining time, and improve yield on precision parts.
Q3: “Can you guarantee chemistry & traceability?”
A: We supply with heat/lot traceability and material test documentation aligned to the specified grade/standard. For critical projects, PMI/third-party inspection can be arranged.
Q4: “Is 4130 weldable, and how do we avoid cracking?”
A: 4130 is generally weldable, but process control matters. For demanding weldments, pre/post-weld heat treatment is commonly recommended to reduce cold-cracking risk and preserve toughness.
Q5: “What about corrosion—will it rust?”
A: 4130 is a low-alloy steel and typically needs surface protection in humid/chloride environments (oil, phosphate, paint, zinc, epoxy, etc.). For aggressive corrosion conditions, consider upgrading the protection system or switching to a corrosion-resistant alloy.
Chemical Composition
| Standard System |
Grade |
C (%) |
Si (%) |
Mn (%) |
P (max, %) |
S (max, %) |
Cr (%) |
Mo (%) |
Ni (max, %) |
Cu (max, %) |
| ASTM/SAE |
4130 (UNS G41300) |
0.28–0.33 |
0.15–0.35 |
0.40–0.60 |
0.035 |
0.040 |
0.80–1.10 |
0.15–0.25 |
— |
— |
| EN |
25CrMo4 (1.7218) |
0.220–0.290 |
≤0.400 |
0.600–0.900 |
0.025 |
0.035 |
0.900–1.200 |
0.150–0.300 |
— |
— |
| JIS |
SCM430 |
0.28–0.33 |
0.15–0.35 |
0.60–0.90 |
0.03 |
0.03 |
0.90–1.20 |
0.15–0.30 |
0.25 |
0.30 |
| GB |
30CrMo |
0.26–0.33 |
0.17–0.37 |
0.40–0.70 |
0.03 |
0.03 |
0.80–1.10 |
0.15–0.25 |
0.30 |
0.30 |
| GOST |
30ХМА (30KhMA) |
0.26–0.33 |
0.17–0.37 |
0.40–0.70 |
0.025 |
0.025 |
0.80–1.10 |
0.15–0.25 |
0.30 |
0.30 |
Mechanical Properties
| Grade |
Example Delivery / Heat Treatment Condition |
Tensile Strength (MPa) |
Yield Strength (MPa) |
Elongation (%) |
Hardness (example) |
| ASTM A513 4130 |
DOM Stress-Relieved tubing |
≥620 |
≥550 |
≥10 |
RB ≥87 |
| EN 25CrMo4 |
Typical values (varies with HT) |
650–800 |
≥400 |
16–60 |
As per HT |
| JIS SCM430 |
Q&T (example condition shown in summary tables) |
≥930 |
≥785 |
≥12 |
≤229 HBW |
| GB 30CrMo |
Q&T (example d=25 mm in summary tables) |
≥930 |
≥785 |
≥12 |
≤229 HBW |
| GOST 30ХМА |
Q&T (example scope noted in summary tables) |
≥930 |
≥735 |
≥12 |
— |
Applicable Standards
Application Fields
Typical industries: Automotive & motorsport, aerospace support components, industrial machinery, agricultural/construction equipment, energy equipment, precision mechanical manufacturing.
Where it is used (examples):
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Drivetrain & power transmission: shafts, sleeves, torque tubes, couplers
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Structural mechanical parts: roll-cage members, frames, brackets, high-strength supports
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Machined precision parts: bushings, pins, spacers, high-load housings (benefits from DOM concentricity)
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Hydraulic / cylinder-related components: where tight ID tolerance or honed ID is specified (by agreement)
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.
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