A519 standard specification for seamless carbon and alloy steel mechanical tubing

American Piping Products stocks A519 piping and tubing in the following formulas and grades:
Formula Grade NPS Schedule Non-scheduled Walls O.D.
4130 pipe L80, P110 heat treated mechanicals 2″ – 12″ 120 to XXH Through 1.5″ …A …
4130 tube L80, P110 heat treated mechanicals … … … 0.375″ – 1.500″ 2.375″ – 12.750″
4140 tube L80, P110, Q125 heat treated mechanicals … … … 0.375″ – 4.000″ 2.5″ – 15″

AEllipses indicate the value is not applicable.

Scope

ASTM A519 covers several grades of carbon and alloy steel seamless mechanical tubing. As the chart above indicates, the standard is also acceptable for the manufacture of piping. It is manufactured by hot working and then cold finishing the steel into round, square, rectangle or special shapes. AISI 4130 and AISI 4140 are steel formula designations indicating medium carbon content with strengthening alloys that include chromium, manganese, silicon, molybdenum, sulfur and phosphorus.

Chemistry

4130 4140
Carbon max. % 0.28 – 0.33 0.38 – 0.43
Manganese % 0.40 – 0.60 0.75 – 1.00
Phosphorous, max. % 0.04 0.04
Sulfur, max. % 0.04 0.04
Silicon, min.% 0.15 – 0.35 0.15 – 0.35
Chrome, max. % 0.80 – 1.10 0.80 – 1.10
Molybdenum, max. % 0.15 – 0.25 0.15 – 0.25

Mechanical Properties

The minimum wall thickness at any point shall not be more than 12.5% under the nominal wall thickness specified.

Mechanicals Heat Condition Hardness Yield Tensile
A519-4130 / 4140 Quenched and Tempered 28-32 RC Not Tested Not Tested
API 5CT L80 in 4519-4100 Quenched and Tempered 18-22 RC 80 – 95 ksi 95 ksi min
API 5CT P110 in 4519-4100 Quenched and Tempered 30-36 RC 110 – 140 ksi 125 ksi min
API 5CT Q125 in 4519-4100 Quenched and Tempered 32-36 RC 125 – 150 ksi 135 ksi min

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 4100 Alloys

Condition Grade Medium
Annealed A519-4130 CD Air
Annealed or Normalized A519-4130 /A519-4140 Air
Quenched and Tempered A519-4130 Water
Quenched and Tempered A519-4140 Polymer or Oil

Tolerances

Condition OD Wall
Annealed or Normalized ASTM A519 ASTM 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.
 

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