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”.

Scope

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

Mechanical properties

The minimal wall thickness at any point shall not be more than 12.5% under the nominal wall thickness specified. Yield and tensile tests are not required for A519-4140 when quenched and tempered to HRC 28 – 32.

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

ConditionGradeMedium 
Annealed or normalizedA519-4140Air
Quenched and temperedA519-4140Polymer or oil

Tolerances

ConditionODWall
Annealed or normalizedASTM A519ASTM A519
Quenched and tempered+/- 1%+/- 12.5%

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.