Products Description
Product Specifications
| Standards | ASTM A519 / A519M |
| Steel Grades |
AISI 4130 / UNS G41300
|
| Equivalent Standards | 25CrMo4(EN/DIN 1.7218),SCM430(JIS),30CrMo(GB) |
| Outer Diameter (OD) | 6 mm – 610 mm |
| Wall Thickness (WT) | 1 mm – 60 mm |
| Length | 6 / 12 m |
| Surface Treatment | Black, pickled, shot-blasted, bright, polished or as specified |
| Production Process | Hot-rolled / Cold-drawn |
| Condition | HR, CW, SR, A, N, Q&T |
AISI 4130 steel tube offers excellent machinability and weldability; it can be effectively welded when preheated to 150–250 °C. In its cold-drawn state, it is suitable for direct machining operations such as turning, drilling, and knurling. It is an ideal choice for components that rely heavily on TIG welding, such as roll cages for race cars and suspension mounts.
The tubing is manufactured via a cold-drawing process, which provides the dual benefits of work hardening and high dimensional precision. It achieves an outer diameter tolerance of ±0.05 mm, an inner diameter tolerance meeting H8/H9 standards, and a surface roughness (Ra) of ≤ 0.8 μm-minimizing or even eliminating the need for subsequent internal machining.
Customized Services
- Customized Dimensions: We offer custom sizing for outer diameters (OD) ranging from 6 mm to 610 mm (with specific services available for the 1–60 mm range). OD tolerances can be held to ±0.05 mm, while inner diameter (ID) tolerances meet H8/H9 standards.
- Surface and End Processing: We provide honing or skiving and roller burnishing for internal bores (achieving a surface roughness of Ra ≤ 0.4 μm) to enhance sealing performance. Outer surfaces can be polished or turned to meet precise fit requirements. Tube ends can be chamfered, squared, or threaded according to your specifications.
- Custom Heat Treatment: To suit your downstream processing and operational requirements, we offer products in various heat-treated conditions, including normalized, annealed, quenched and tempered (QT), and surface-hardened (via high-frequency induction hardening).
Chemical Composition
| Steel Grade | C | Mn | P, max. | S, max. | Si | Cr | Mo |
|---|---|---|---|---|---|---|---|
| AISI 4130 | 0.28–0.33 | 0.40–0.60 | 0.035 | 0.040 | 0.15–0.35 | 0.80–1.10 | 0.15–0.25 |
Mechanical Properties
| Steel Grade / Condition | Tensile Strength | Yield Strength | Elongation | Hardness |
|---|---|---|---|---|
| AISI 4130, normalized | Typically 600–750 MPa | Typically 400–550 MPa | Typically ≥20% | Approx. 180–220 HB |
| AISI 4130, quenched & tempered | Typically 800–1,000+ MPa | Typically 650–850+ MPa | Typically ≥12% | Approx. 240–300 HB |
Possible Alternative Grades
- For general mechanical tubing applications where high strength is not required, 1026 steel is a suitable choice; it is more cost-effective than 4130 and offers good cold-formability and weldability.
- When components require surface wear resistance-such as pins, sleeves, or camshafts-4145 or 4150 steel can be used; these can achieve a surface hardness of HRC 55–60 following high-frequency induction hardening.
- For non-load-bearing structural components, AISI 1020 steel is a good option; it is easier to weld and generally more affordable, making it suitable for conventional automotive brackets, frames, and non-critical tubular structures.
application areas
Typical applications for AISI 4130 steel tube in the automotive and transportation sectors include:
- Drivetrain: Driveshaft tubes, axle housing tubes, universal joint yoke sleeves, and torque tubes.
- Steering System: Steering gear housings, steering tie rods, intermediate shafts, and steering knuckle arms.
- Suspension System: Shock absorber inner tubes, air suspension cylinders, and stabilizer bar sleeves.
- Hydraulic System: Hydraulic cylinder barrels, pneumatic cylinder tubes, and power steering pressure lines.
- Chassis and Frame: Frame side rail sleeves, subframe bushing mounts, pedal brackets, and bumper reinforcement beams.
Products Show
Testing Equipment
Factory Equipment
Pickling equipment
Polishing equipment
Cold drawing equipment
Products Package
FAQ
Q: Are ASTM A519 4130 and AISI 4130 the same material?
A: Yes. ASTM A519 is a product standard (for seamless mechanical tubing), while AISI/SAE 4130 is an alloy grade (with the UNS designation G41300). The 4130 grade specified under ASTM A519 is chemically identical to AISI/SAE 4130.
Q: In what delivery condition is 4130 most commonly used in automotive applications?
A: For roll cages and welded structural tubing, the material is typically supplied in a normalized (N) or annealed (A) state, which balances formability with post-welding performance. For components that undergo final heat treatment-such as driveshafts or axle shafts-the material may be supplied in a quenched and tempered (Q&T) condition.
Q: What tolerances and surface quality can be achieved with cold-drawn 4130 tubing?
A: For typical cold-drawn precision tubing, the outer diameter tolerance is ±0.05 mm, and the inner diameter can be controlled to H8/H9 (per ISO 286-2). In the cold-drawn state, the surface roughness (Ra) is ≤ 0.8 μm; this can be further improved to Ra ≤ 0.4 μm through honing, skiving, or roller burnishing.
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