A519 4140 tube

American Piping Products stocks A519-4140 tube in the following grades:
  • L80 and P110 heat treated mechanicals.
  • OD from 2.375” to 12.750”.
  • Walls from 0.375” to 1.500”.


ASTM A519 covers several grades of carbon and alloy steel seamless mechanical tubing. It is manufactured by hot working and then cold finishing the steel into round, square, rectangle or special shapes. AISI 4140 is a steel formula designation indicating medium carbon content with strengthening alloys that include chromium, manganese, silicon, molybdenum, sulfur and phosphorus.

AISI 4140 chemistry

Carbon % 0.38 – 0.43
Manganese % 0.75 – 1.00
Phosphorus, max % 0.04
Sulfur, max % 0.04
Silicon % 0.15 – 0.35
Chromium % 0.80 – 1.10
Molybdenum % 0.15 – 0.25

Charpy V notch testing

Charpy V notch testing (CVN) is not required, but much of American Piping Products’ inventory is tested at the mill.

Heat conditions for A519-4140 mechanical tubing

Condition Grade Medium 
Annealed or normalized A519-4140 Air
Quenched and tempered A519-4140 Polymer or oil


Condition OD Wall
Annealed or normalized ASTM A519 ASTM A519
Quenched and tempered +/- 1%A VariesB
ATolerance is typical but not standardized.
BVariation depends on manufacturing process and outside diameter.

Reference documents

  • ASTM A370 Standard Test Methods and Definitions for Mechanical Testing of Steel Products.
  • ASTM A751 Test Methods, Practices, and Terminology for Chemical Analysis of Steel Products.
  • ASTM A1040 Guide for Specifying Harmonized Standard Grade Compositions for Wrought Carbon, Low-Alloy, and Alloy Steels.
  • ASTM A1058 Test Methods for Mechanical Testing of Steel Products – Metric.