ASTM A519 Grade 4130 Tubing
Grade 4130 is one of many grades listed in ASTM A519. Buyers usually want to know how strong it is, and the honest answer is that it depends on the condition and on whether testing was ordered.
Grade 4130 Composition in ASTM A519
The ASTM A519 Grade 4130 composition limits are defined in the specification's chemical composition table. Buyers should refer to the current version of ASTM A519 for the precise limits. The key alloying elements and their approximate ranges in 4130 are:
- Carbon: approximately 0.28–0.33%
- Chromium: approximately 0.80–1.10%
- Molybdenum: approximately 0.15–0.25%
These are approximate ranges for general reference. The actual limits are defined in the current ASTM A519 standard. Always verify the actual ladle analysis on the MTC against the current specification limits for your specific heat of material.
**Note:** Buyers should not assume that all material sold as '4130' contains exactly these values — the MTC ladle analysis provides the actual chemistry for the specific heat supplied.
| Element | Approximate Range in A519 Grade 4130 | Buyer Action |
|---|---|---|
| Carbon (C) | ~0.28–0.33% | Check MTC ladle analysis — confirm within limits |
| Chromium (Cr) | ~0.80–1.10% | Check MTC — confirms Cr-Mo alloy identity |
| Molybdenum (Mo) | ~0.15–0.25% | Check MTC — confirms Mo alloying |
| Manganese (Mn) | ~0.40–0.60% | Check MTC against spec |
| Note | Always refer to current A519 for exact limits | Obtain current ASTM A519 edition |
MTC Verification for Grade 4130
When receiving 4130 tubing to ASTM A519, the following should be checked on the MTC:
1. The material standard is stated as ASTM A519
2. The grade is stated as 4130
3. The ladle analysis (chemical analysis) shows element values within the A519 Grade 4130 limits
4. The heat/cast number is recorded
5. The product form (CDS or HFS) matches the order
6. The condition is recorded
Typical Properties by Condition
The figures below are typical values for Grade 4130 of the kind published for guidance. They are not minimum requirements unless the purchase order makes them so.
| Condition | Tensile strength | Yield strength | Elongation |
|---|---|---|---|
| Hot rolled | about 90 ksi (620 MPa) | about 70 ksi (480 MPa) | about 20 % |
| Stress relieved | about 105 ksi (725 MPa) | about 85 ksi (585 MPa) | about 10 % |
| Annealed | about 75 ksi (515 MPa) | about 55 ksi (380 MPa) | about 30 % |
| Normalized | about 90 ksi (620 MPa) | about 60 ksi (415 MPa) | about 20 % |
Actual results vary with wall thickness, the amount of cold work and the exact heat treatment. If your design depends on a minimum value, state that value on the order and require a tensile test, so the certificate reports the properties of the tube supplied. Aircraft specifications set their own, higher minimums for normalized tube. More detail is on the mechanical properties page and the standard is outlined under ASTM A519 4130 tubing.
Frequently Asked Questions
What if the MTC ladle analysis shows a carbon value at the upper limit?
As long as the carbon value is within the ASTM A519 Grade 4130 specified limits, the material meets the standard. Material at the upper carbon limit will have slightly higher hardenability than lower-carbon heats, which is generally not a problem for structural applications but may be relevant for welding procedure selection.
What is the yield strength of ASTM A519 4130?
It depends on condition. Typical values range from about 55 ksi annealed to about 85 ksi stress relieved.
Are these strengths guaranteed?
Only if mechanical properties are specified and tested as part of the order.
Order ASTM A519 Grade 4130 Tubing
Provide form, OD, wall, condition, and documentation requirements to receive an accurate A519 Grade 4130 quotation.
- Standard: ASTM A519
- Grade: 4130
- Form: CDS or HFS
- OD & Wall
- Condition
- MTC requirement
- Delivery