Carbon Steels 1040 | ||||
Specifications: | ASTM A29 (1040) ASTM A510 (1040) ASTM A513 ASTM A519 (1040) ASTM A546 (1040) ASTM A576 (1040) ASTM A682 (1040) ASTM A827 ASTM A830 MIL S-11310 (CS 1040) MIL S-16788 MIL S-46070 SAE J1397 (1040) SAE J403 (1040) SAE J412 (1040) UNS G10400 | |||
Chemistry Data | ||||
Carbon | 0.37 - 0.44 | |||
Iron | Balance | |||
Manganese | 0.6 - 0.9 | |||
Phosphorus | 0.04 max | |||
Sulphur | 0.05 max | |||
General Information | ||||
Principal Design Features | ||||
1040 steel has a higher (0.40%) carbon content for greater strength than the lower carbon alloys. It is hardenable by heat treatment, quench and tempering to develop 150 to 250 ksi tensile strength. | ||||
Applications | ||||
Used for crankshafts, couplings and cold headed parts. | ||||
Machinability | ||||
Machinability is good, rated at 60% that of the 1112 alloy used as a 100% machining rated steel. | ||||
Forming | ||||
Forming of 1040 steel in the annealed condition is readily accomplished. | ||||
Welding | ||||
1040 steel is weldable by all of the welding methods. However with its higher carbon content it is important to use both pre-heat at 300 to 500 F and post-heat at 1100 to 1200 F practice per an approved welding procedure. | ||||
Heat Treatment | ||||
This steel responds well to hardening by heat treatment at 1550 to 1650 F followed by water quench and then tempering to strength level desired. | ||||
Forging | ||||
Forge at 2300 F down to 1800 F. | ||||
Hot Working | ||||
Hot work from 900 to 200 F. | ||||
Cold Working | ||||
In the annealed state the 1040 alloy is readily cold worked by conventional methods. | ||||
Annealing | ||||
Anneal at 1600 to 1800 F and slow cool in the furnace for a full anneal. A stress relief anneal may be done at 1100 F and a normalizing treatment may be done at 1650 F with slow cooling. | ||||
Aging | ||||
Not applicable. | ||||
Tempering | ||||
Tempering from the quenched condition may be done at 600 to 1300 F depending upon the strength desired. | ||||
Hardening | ||||
Cold work will harden the alloy as will heat treatment and tempering. | ||||
Physical Data | ||||
Density (lb / cu. in.) | 0.284 | |||
Specific Gravity | 7.86 | |||
Specific Heat (Btu/lb/Deg F - [32-212 Deg F]) | 0.107 | |||
Melting Point (Deg F) | 2770 | |||
Poissons Ratio | 0.3 | |||
Thermal Conductivity | 360 | |||
Mean Coeff Thermal Expansion | 6.7 | |||
Modulus of Elasticity Tension | 30 | |||
Modulus of Elasticity Torsion | 11 | |||
Mechanical Data | ||||
Form | Round Bar | |||
Condition | Cold Drawn | |||
Temper | 68 | |||
Tensile Strength | 85 | |||
Yield Strength | 71 | |||
Elongation | 17 | |||
Reduction of Area | 42 | |||
Rockwell | B93 | |||
Brinnell | 170 | |||
Form | Round Bar | |||
Condition | Hot Rolled | |||
Temper | 68 | |||
Tensile Strength | 90 | |||
Yield Strength | 56 | |||
Elongation | 24 | |||
Reduction of Area | 49 | |||
Rockwell | B91 | |||
Brinnell | 187 |
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