Products Description
Product Specifications
| Standards | ASTM A519 |
| Steel Grades |
4042,4047,4063,4118,4130,4135,4137,4140, 4142,4145,4147,4150,etc. |
| Equivalent Standards |
UNS G41300,AISI 4130,JIS SCM430,GB 30CrMo,etc |
| Outer Diameter (OD) | 10 × 10 mm – 150 × 150 mm |
| Wall Thickness (WT) | 1.0 – 12 mm |
| Length | 3/6/12 m |
| Surface Treatment | Bright annealed |
| Production Process | Hot Rolled / Cold Drawn / Cold Rolled |
| Condition | Annealed |
Compared to standard carbon steel, chromoly square tubing offers superior fatigue life and toughness; specifically, 4130 steel exhibits a fatigue limit (rotating bending) of approximately 330 MPa at a strength level of 690 MPa. It withstands repeated high-G cornering and jump impacts without crack propagation, effectively extending the service life of the chassis.
Chromoly tubing also boasts excellent high-temperature resistance and oxidation resistance, remaining stable and corrosion-resistant during prolonged exposure to the 150–250°C temperatures found near the engine, making it well-suited for the demanding conditions of racing engine bays and chassis assemblies.
Customized Services
- We provide deep processing services such as tube bending, punching, slotting, end reducing, end expanding, and profile cutting.
- TORICH offers CNC 3D tube bending services; minimum bending radii are determined by the cross-sectional design, and pre-welding of tube assemblies and column joints is available to reduce welding work for the customer.
- Customized heat treatment processes-including annealing, normalizing, quenching and tempering, and stress relief-are provided based on structural load-bearing requirements.
- We support various surface treatments, such as pickling and rust prevention, precision mirror polishing, sandblasting (matte finish), black oxide coating, galvanizing, and anti-corrosion coatings.
Chemical Composition
Taking ASTM A519 4130 as an example
| Element | C | Si | Mn | P | S | Cr | Mo | Fe |
|---|---|---|---|---|---|---|---|---|
| Composition (%) | 0.28–0.33 | 0.15–0.35 | 0.40–0.60 | ≤0.035 | ≤0.040 | 0.80–1.10 | 0.15–0.25 | Balance |
Mechanical Properties
Taking ASTM A519 4130 as an example
| Property | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) | Hardness |
|---|---|---|---|---|
| Annealed | ≥560 | ≥360 | ≥25 | 170–200 HB |
| Normalized | ≥650 | ≥460 | ≥20 | 190–220 HB |
| Quenched & Tempered | 800–950 | 650–850 | ≥10 | 250–320 HB |
Possible Alternative Grades
- 4140 chromium-molybdenum steel is an upgraded version of 4130, featuring higher carbon and manganese content and superior resistance to deformation. It is suitable for critical components in top-tier race cars, such as high-strength load-bearing structures, suspension mounts subjected to extreme stress, and specialized roll cages.
- For non-critical load-bearing structures in entry-level race cars, karts, or recreational modified vehicles, 1025/1026 steel is a suitable choice due to its low cost, ease of processing, and high ductility.
Applications areas
- Racing Chassis: Tubular space-frame chassis, lightweight racing frames, competition vehicle structures
- Roll Cage Systems: Main hoops, side-impact bars, roof protection structures, etc.
- Suspension Structures: Suspension mounting points, control arm supports, reinforcement members, etc.
- Off-Road Racing: Baja racing frames, UTV/ATV structures, protective roll cages, etc.
Products Show
Testing Equipment
Factory Equipment
Pickling equipment
Polishing equipment
Cold drawing equipment
Products Package
FAQ
Q: Do you offer custom heat treatment for the tubing, and how does this benefit racing applications?
A: A: We support a full range of custom heat treatments, including annealing, normalizing, and quenching & tempering. Annealed tubing offers excellent toughness, making it ideal for impact-resistant structures like roll cages; quenched & tempered tubing provides high strength, suitable for load-bearing components such as suspension parts and brackets. We can precisely match material properties to your specific application requirements.
Q: Does square chromoly steel tubing require rustproofing?
A: A: While 4130 chromoly steel offers better rust resistance than standard carbon steel, prolonged exposure to moisture or track debris (mud and water) makes surface treatments-such as sandblasting, black oxide coating, or painting-advisable to extend the tubing's service life.
Q: Can you cut bevels and fish-mouth (coping) profiles on the tube ends according to my drawings?
A: A: Yes. Please provide STEP or DXF files; we use CNC laser or plasma cutting and perform end-beveling to ensure the precision required for welding fit-up.
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