ASTM A519 Grade 4130 is a carbon steel seamless tube and aluminum alloy steel seamless tube for mechanical engineering manufactured in accordance with American Society for Testing and Materials
Chemical composition
Application fields
Mainly used for oil exploration equipment, drilling equipment, mechanical oil production equipment, oil drilling and production equipment and accessories, and oil and gas collection and transportation complete sets of necessary materials
Welding procedure qualification
(1) Tensile strength: ≥655 MPa
(2) Impact test: The test temperature is -29°C, the average impact absorbed energy Akv≥27J, and the single impact absorbed energy ≥20J.
(3) Bending test:After bending, the size of any crack or other defect in any direction found in the weld seam and fusion line area on the tensile bending surface of the sample should not be greater than 1/2 of the nominal wall thickness of the steel pipe, and not greater than 3mm. Unless other defects are found, the length of cracks arising from the edge of the test piece shall not be greater than 6mm in any direction.
(4) Notch test: The fracture surface of each notched hammer fracture specimen shall be completely penetrated and fused. The maximum size of any air hole should not be greater than 1.6mm, and the cumulative area of all air holes should not be greater than 2% of the fracture area. The depth of slag inclusion should not be greater than 0.8mm, and the length should not be greater than 1/2 of the nominal wall thickness of the steel pipe, and less than 3mm. The distance between adjacent slag inclusions should be at least 13mm. White spots are not to be considered as a reason for failure.
(5) Hardness test: 197 HV10≤average value≤250 HV10, single value≤260 HV10.
(6) In order to prevent sulfide stress cracking, the chemical element Ni content in the weld deposit metal is not more than 1% (mass percentage).
Chemical composition
| Grade | C | Mn | PC max |
SCD max |
Ci | 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 |
Application fields
Mainly used for oil exploration equipment, drilling equipment, mechanical oil production equipment, oil drilling and production equipment and accessories, and oil and gas collection and transportation complete sets of necessary materials
Welding procedure qualification
(1) Tensile strength: ≥655 MPa
(2) Impact test: The test temperature is -29°C, the average impact absorbed energy Akv≥27J, and the single impact absorbed energy ≥20J.
(3) Bending test:After bending, the size of any crack or other defect in any direction found in the weld seam and fusion line area on the tensile bending surface of the sample should not be greater than 1/2 of the nominal wall thickness of the steel pipe, and not greater than 3mm. Unless other defects are found, the length of cracks arising from the edge of the test piece shall not be greater than 6mm in any direction.
(4) Notch test: The fracture surface of each notched hammer fracture specimen shall be completely penetrated and fused. The maximum size of any air hole should not be greater than 1.6mm, and the cumulative area of all air holes should not be greater than 2% of the fracture area. The depth of slag inclusion should not be greater than 0.8mm, and the length should not be greater than 1/2 of the nominal wall thickness of the steel pipe, and less than 3mm. The distance between adjacent slag inclusions should be at least 13mm. White spots are not to be considered as a reason for failure.
(5) Hardness test: 197 HV10≤average value≤250 HV10, single value≤260 HV10.
(6) In order to prevent sulfide stress cracking, the chemical element Ni content in the weld deposit metal is not more than 1% (mass percentage).
