Automotive Mechanical SCM430 Alloy Precision Steel Pipe Cold Drawn Seamless Steel Pipe
Product Details
Automotive Mechanical Precision Steel Pipe
,SCM430 Alloy Seamless Steel Pipe
,Cold Drawn Alloy 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.
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