ASTM A513 4130 Chromoly Cold Drawn Precision Steel Tube for Mechanical Engineering
Product Details
ASTM A513 4130 Precision Steel Tube
,Cold Drawn DOM Steel Tube
,Mechanical Engineering Chromoly Steel Tube
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
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ASTM
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ASTM A513/A513M — Electric-Resistance-Welded carbon/alloy mechanical tubing (incl. Type 5 DOM)
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ASTM A519/A519M — Seamless carbon/alloy mechanical tubing (alternative when “seamless” is mandatory)
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EN
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EN 10083-3 — Quenched and tempered alloy steels (commonly referenced for 25CrMo4)
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EN 10305-1 / EN 10297-1 — Precision / mechanical seamless tube routes (project-dependent)
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GOST
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GOST 4543 — Alloyed construction steels (commonly referenced for 30ХМА / 30KhMA)
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JIS
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JIS G 4053 — Low-alloyed steels for machine structural use (SCM grades; steel chemistry reference)
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GB
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GB/T 3077 — Alloy structure steels (commonly referenced for 30CrMo chemistry/properties)
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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.
If you have another question, pls feel free to contact with me.
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