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Alloy steel tubes SAE AISI 4130 4140 4340 seamless steel pipes can be either hot rolled or cold drawn. The technical standard is ASTM A519. A519 specification covers seamless hot rolled mechanical tubes and seamless cold drawn mechanical tubes up to 12.75 inches (323.8mm) outside diameter.
SAE AISI 4130 4140 4340 alloy steel tube chemical composition:
| Grade | C | Mn | P | S | Si | Ni | Cr | Mo |
| 4130 | 0.28-0.33 | 0.40-0.60 | 0.040 | 0.040 | 0.15-0.35 | 0.80-1.10 | 0.15-0.25 | |
| 4140 | 0.38-0.43 | 0.75-1.00 | 0.040 | 0.040 | 0.15-0.35 | 0.80-1.10 | 0.15-0.25 | |
| 4340 | 0.38-0.43 | 0.60-0.80 | 0.040 | 0.040 | 0.15-0.35 | 1.65-2.00 | 0.70-0.90 | 0.20-0.30 |
Alloy steel tube SAE AISI 4130 4140 4340 chromoly pipe mechanical properties:
| Steel | Delivery | Tensile Strength | Yield Strength | Elongation | Hardness | ||
| Grade | State | Ksi | Mpa | Ksi | Mpa | (50mm) | (HB) |
| 4130 | HR | 90 | 621 | 70 | 483 | 20 | 89 |
| SR | 105 | 724 | 85 | 586 | 10 | 95 | |
| A | 75 | 517 | 55 | 379 | 30 | 81 | |
| N | 90 | 621 | 60 | 414 | 20 | 89 | |
| 4140 | HR | 120 | 855 | 90 | 621 | 15 | 100 |
| SR | 120 | 855 | 100 | 689 | 10 | 100 | |
| A | 80 | 552 | 60 | 414 | 25 | 85 | |
| N | 120 | 855 | 90 | 621 | 20 | 100 | |
Note: HR – hot rolling, CW – cold drawing, SR – stress relief, A – annealing, N – normalizing.
Alloy steel tubes SAE AISI 4130 4140 4340 seamless steel pipes quality assurance:
Magnetic Particle Testing (MT)
Eddy Current Flaw Detection (ET)
Ray detection (RT)
Penetration Testing (PT)
Ultrasonic Testing (UT)
SAE AISI 4130 4140 4340 seamless steel tubes are widely used in industrial equipment, oil and gas industry, etc. The cold drawn 4130 4140 4340 steel pipes are preferred to make motor rotor. HL STEEL 4130 4140 4340 chromoly tubes are exported all over the world, especially in Russia etc. countries.
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