What are Grades 1030/1040?

Grades 1030 and 1040 are medium carbon steels that respond well to heat treatment. These 1030 1040 tubes fill the gap between low-carbon grades that weld easily and high-carbon grades with more strength. 1030 has 0.28-0.34% carbon. It is easier to weld and gives moderate strength. Grade 1040 has more carbon at 0.37-0.44%. It offers higher strength. You must preheat it for welding. Both can be quenched and tempered. This reaches hardness levels needed for tough mechanical applications.

ASTM A519 GRADE 1030, 1040 Tube Specifications

Technical specifications for Grade 1030 and 1040 seamless mechanical tubing as per ASTM A519:

Product Name Seamless Carbon steel pipe
Size OD 12.7mm-710mm  
Thickness 3mm-45mm  
Length SRL,DRL,5.8M,11.8M  
Steel Material ASTM A519-03,A213,A192,A106,A269,SA333,SA334,SA335 
Steel Grade 1030, 1040
Process Hot rolled/hot expansion/cold drawn/cold rolled
Usage Mechanical and General Engineering Purposes
Surface Bared Black Painting, Galvanized,Coating

ASTM A519 GRADE 1030, 1040 Tube Chemical Composition

Chemical composition comparison of 1030 and 1040 grades per ASTM A519:

Grade Carbon Silicon Manganese Phosphorous Sulphur Molybdenum Nickel Chromium Copper Others
1030 0.28-0.34 – 0.60-0.90 0.04 0.05 – – – – –
1040 0.37-0.44 - 0.60-0.90 0.04 0.05 - - - - -

ASTM A519 GRADE 1030, 1040 Tube Mechanical Properties

Mechanical properties comparison in annealed and quenched & tempered conditions:

Yield Strength Tensile Strength Elongation A5 min
MPa min ksi min MPa min MPa min ksi min Percentage
1030     – – –
1040     – – –

Heat Treatment

Both grades are oil quench and temper capable. Recommended heat treatment parameters:

  • Normalise: 870-925°C (1600-1700°F)
  • Harden: 830-860°C (1525-1575°F), oil quench
  • Temper: 400-650°C (750-1200°F) for desired hardness

Grade 1040 achieves higher hardness than 1030 due to its higher carbon content.

Applications

The A519 1040 tubes and 1030 tubes serve 3 main applications requiring medium strength and heat treatment capability:

Shafts and Axles

Medium-duty rotating shafts, spindles, and axle tubes for machinery and vehicles benefit from the combination of strength and toughness these grades provide.

Machinery Components

Gears (non-carburised), couplings, and general machine parts requiring good strength use these medium carbon tubes for their heat treatment response.

Agricultural Equipment

Implement shafts, pins, and structural tubes for farm machinery rely on the durability and strength of 1030 and 1040 tubing.

Frequently Asked Questions

  • Can 1030/1040 be welded?

    1030 is weldable with low-hydrogen electrodes. Preheat is recommended for thick sections. 1040 requires preheat (150-260°C/300-500°F) and post-weld heat treatment for best results.

  • Which is better for shafts: 1040 or 1045?

    1040 provides good strength with better weldability. 1045 offers higher strength but requires more care in heat treatment and welding. Choose based on your specific strength requirements and fabrication needs.