ASTM A 519 – Seamless Carbon and Alloy Steel Mechanical Tubing
ASTM A519 covers several grades of carbon and alloy steel seamless mechanical tubing. When welding is used for joining the weldable mechanical tube grades, the welding procedure shall be suitable for the grade, the condition of the components,and the intended service. This specification covers both seamless hot-finished mechanical tubing and seamless cold-finished
mechanical tubing in sizes up to and including 12 – 3/4 in. (323.8 mm) outside diameter for round tubes with wall thicknesses as required. The tubes shall be furnished in the following shapes, as specified by the purchaser: round, square, rectangular, and special sections.
Grade: 4140
A519 4140 alloy steel is a chromium,molybdenum and manganese containing low alloy steel. It has high fatigue strength, abrasion and impact resistance, toughness,and torsional strength.
Referenced Documents
ASTM Standards:
A 370 Test Methods and Definitions for Mechanical Testing of Steel Products
A 1040 Guide for Specifying Harmonized Standard Grade Compositions for Wrought Carbon,Low-Alloy, and Alloy Steels
E 59 Practice for Sampling Steel and Iron for Determination of Chemical Composition
Military Standards:
MIL-STD-129 Marking for Shipment and Storage
MIL-STD-163 Steel Mill Products Preparation for Shipment and Storage
Federal Standard:
Fed.Std.No.123 Marking for Shipment (Civil Agencies)
Ordering Information
1 Orders for material under this specification should include the following, as required, to describe the desired material adequately:
1.1 Quantity (feet, weight, or number of pieces),
1.2 Name of material (seamless carbon or alloy steel mechanical tubing),
1.3 Form (round,square, rectangular or special shapes),
1.4 Dimensions (round,outside diameters and wall thickness; square and rectangular, outside dimensions and wall thickness; other,specify),
1.5 Length (specific or random, mill lengths),
1.6 Manufacture (hot finished or cold finished),
1.7 Grade,
1.8 Condition (sizing method and thermal treatment),
1.9 Surface finish (special pickling, shot blasting, or ground outside surface, if required),
1.10 Specification designation,
1.11 Individual supplementary requirements, if required,
1.12 End use, if known,
1.13 Packaging,
1.14 Product analysis and chemical analysis, if required,
1.15 Specific requirements, or exceptions to this specification,
1.16 Special marking, and
1.17 Special packing.
Chemical Compositions of ASTM A519 4140 alloy steel pipes (max,%)
| 4140 | Heat Analysis |
| C | 0.38-0.43 |
| Mn | 0.75-1.00 |
| P | 0.040 |
| S | 0.040 |
| Si | 0.15-0.35 |
| Cr | 0.80-1.10 |
| Mo | 0.15-0.25 |
Outside Diameter Tolerances for Round Hot-Finished A519 4140 Tubing
| Outside Diameter Size Range, | Outside Diameter Tolerance, in. (mm) | |
| in. (mm) | Over | Under |
| Up to 2.999 (76.17) | 0.020 (0.51) | 0.020 (0.51) |
| 3.000–4.499 (76.20–114.27) | 0.025 (0.64) | 0.025 (0.64) |
| 4.500–5.999 (114.30–152.37) | 0.031 (0.79) | 0.031 (0.79) |
| 6.000–7.499 (152.40–190.47) | 0.037 (0.94) | 0.037 (0.94) |
| 7.500–8.999 (190.50–228.57) | 0.045 (1.14) | 0.045 (1.14) |
| 9.000–10.750 (228.60–273.05) | 0.050 (1.27) | 0.050 (1.27) |
*Diameter tolerances are not applicable to normalized and tempered or quenched and tempered conditions.
Wall Thickness Tolerances for Round Hot-Finished A519 4140 Tubing
| Thickness/OD（％） | Tolerance（±％） | ||
| ≤2.999 in. (76.19 mm) | 3.000 in.（76.2 mm）≤D ≤5.999 in.（152.3mm） | 6.000 in.（152.4）≤D ≤10.750 in.（273.05mm） | |
| Under 15 | 12.5 | 10.0 | 10.0 |
| 15 and over | 10.0 | 7.5 | 10.0 |
Wall Thickness Tolerances for Round Cold-Worked A519 4140 Tubing
| Thickness/OD（％） | Tolerance（±％） | |
| ID≤1.499 in. (38.07 mm) | ID≥1.500 in. (38.1 mm) | |
| 25 and Under | 10.0 | 7.5 |
| Over 25 | 12.5 | 10.0 |
Typical Tensile Properties, Hardness and Thermal Condition of A519 4140
| Condition | HR | SR | A | N |
| Ultimate Strength, ksi[Mpa] | 120[855] | 120[855] | 80[552] | 120[855] |
| Yield Strength,ksi[Mpa] | 90[621] | 100[689] | 60[414] | 90[621] |
| Elongation in 2 in. or 50 mm,% | 15 | 10 | 25 | 20 |
| Rockwell Hardness B Scale | 100 | 100 | 85 | 100 |
HR = Hot Rolled, SR = Stress Relieved, A = Annealed, N = Normalized
