Automotive Mechanical SCM430 Alloy Precision Steel Pipe Cold Drawn Seamless Steel Pipe
Automotive Precision Seamless Alloy Steel Pipe (SCM415 / SCM420 / SCM430 / SCM435 / SCM440)
Material
This product is a precision seamless mechanical steel pipe manufactured from JIS SCM-series chromium–molybdenum (Cr-Mo) alloy steels. These steels are widely used for automotive and high-load mechanical parts because they combine high strength, good hardenability, fatigue resistance, and stable machining performance. Chemical composition requirements for SCM415/420/430/435/440 are defined in JIS G4053.
Specifications
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Product type: Precision mechanical seamless steel pipe / tube (hot-finished and/or cold-finished)
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Typical OD range: 6–323.8 mm (0.25"–12 3/4")
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Typical wall thickness: 1–50 mm (as required by design)
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Length: 3–12 m random; fixed length on request
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Manufacturing process: hot piercing → hot rolling → cold drawing/cold finishing (optional) → heat treatment (optional) → straightening → NDT/inspection
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Supply condition (optional): Annealed / Normalized / Stress-relieved / Quenched & tempered (per requirement)
Key Features
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Seamless structure for reliable pressure and fatigue performance
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Excellent heat-treat response (carburizing / quenching & tempering / induction hardening depending on grade)
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High strength-to-weight ratio for lightweight automotive design
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Good machinability for precision turning, drilling, honing, and threading
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Stable quality suitable for mass-production components
Our Advantages
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“Can you hold tight tolerances for automated assembly?”
We offer cold-finished options with controlled OD/ID consistency, straightness, and surface quality, enabling stable fit-up for bushings, shafts, sleeves, and welded sub-assemblies. -
“Can you deliver the exact heat-treatment condition I need?”
We can supply multiple delivery conditions commonly used for mechanical tubes (e.g., hot-finished/cold-finished and normalized/annealed/stress-relieved), and align the condition to your target machining or performance requirements. -
“How do you ensure compliance and traceability for automotive programs?”
We provide heat/lot traceability, inspection documentation (e.g., chemical analysis, dimensional reports), and optional NDT (UT/ET) to support consistent qualification and repeatable supply.
Chemical Composition
| JIS Grade | C | Si | Mn | P (max) | S (max) | Cr | Mo |
|---|---|---|---|---|---|---|---|
| SCM415 | 0.13–0.18 | 0.15–0.35 | 0.60–0.85 | 0.030 | 0.030 | 0.90–1.20 | 0.15–0.30 |
| SCM420 | 0.18–0.23 | 0.15–0.35 | 0.60–0.85 | 0.030 | 0.030 | 0.90–1.20 | 0.15–0.30 |
| SCM430 | 0.28–0.33 | 0.15–0.35 | 0.60–0.85 | 0.030 | 0.030 | 0.90–1.20 | 0.15–0.30 |
| SCM435 | 0.33–0.38 | 0.15–0.35 | 0.60–0.85 | 0.030 | 0.030 | 0.90–1.20 | 0.15–0.30 |
| SCM440 | 0.38–0.43 | 0.15–0.35 | 0.60–0.85 | 0.030 | 0.030 | 0.90–1.20 | 0.15–0.30 |
Mechanical Properties
| Grade | Tensile Strength Rm | Yield Strength (Rp0.2 / Re) | Elongation A |
|---|---|---|---|
| SCM415 | 640–930 MPa | ≥ 440 MPa | ≥ 11% |
| SCM420 | 980–1270 MPa | ≥ 685 MPa | ≥ 8% |
| SCM430 | 670 MPa | 435 MPa | 25.5% |
| SCM435 | 900–1100 MPa | ≥ 650 MPa | ≥ 12% |
| SCM440 | 655 MPa | 415 MPa | 25.7% |
Standards (Typical Options, Brief)
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ASTM: ASTM A519/A519M (Seamless carbon & alloy steel mechanical tubing; hot-finished and cold-finished)
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EN: EN 10297-1 (Seamless circular tubes for mechanical and general engineering purposes); EN 10083 / EN 10084 (typical related steel families for Q&T / case-hardening)
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GOST: GOST 4543 (Alloy structural steels)
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JIS: JIS G4053 (Low alloy steels for machine structural use); JIS mechanical-tube standards can be applied per project requirement
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GB: GB/T 3639 (Cold drawn/honed precision seamless steel tubes); GB/T 3077 (Alloy structural steels)
Application Areas
Primary sectors: Automotive, construction machinery, industrial equipment, hydraulic/mechanical systems, high-strength shafts and sleeves.
Typical automotive usage (examples):
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Transmission & drivetrain: drive shafts, axle sleeves, spline sleeves
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Steering & chassis: steering shafts, torsion bars, stabilizer components
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Powertrain & structural parts: high-strength bushings, pins, precision sleeves
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General machining parts: spacers, collars, threaded mechanical components
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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