AISI 1040 steel structure has high carbon content and can be hardened by heat treatment followed by quenching and tempering to achieve 150 to 250 ksi tensile strength.
1040 steel structure Chemical composition：
C(％): 0.37～0.44
Si(％): 0.15～0.35
Mn(％): 0.60～0.90
P(％)≤: 0.025
S(％)≤: 0.025
Cr(％): —
Mo(％): —
Ni(％): —
Other(％): —
1040 steel structure Mechanical property at different heat treatment practice：
Steel size /mm: ≤6.35
Hot-rolling /depth of hot-rolled material via annealing: 0.13
Depth of cold-rolled material via annealing: 0.08
Steel size /mm: ＞6.35～12.7
Hot-rolling /depth of hot-rolled material via annealing: 0.15
Depth of cold-rolled material via annealing: 0.10
Steel size /mm: 12.7～19.1
Hot-rolling /depth of hot-rolled material via annealing: 0.20
Depth of cold-rolled material via annealing: 0.15
Steel size /mm: ＞19.1～25.4
Hot-rolling /depth of hot-rolled material via annealing:0.25
Depth of cold-rolled material via annealing:
Provision for round bar and tubing of bearings
Steel size/mm: ≤25.4
Depth of hot-rolled steel : 0.30
Annealed steel round bar via hot-rolling : 0.38
Annealed steel tubing via hot-rolling: 0.30
Annealed steel round bar via cold-working : 0.30
Annealed steel tubing via cold-working : 0.25
Steel size/mm: ＞25.4～50.8
Depth of hot-rolled steel : 0.43
Annealed steel round bar via hot-rolling : 0.56
Annealed steel tubing via hot-rolling: 0.51
Annealed steel round bar via cold-working : 0.38
Annealed steel tubing via cold-working : 0.36
Steel size/mm:＞50.8～76.2
Depth of hot-rolled steel : 0.64
Annealed steel round bar via hot-rolling : 0.76
Annealed steel tubing via hot-rolling: 0.76
Annealed steel round bar via cold-working : 0.64
Annealed steel tubing via cold-working : 0.48
Steel size/mm: ＞76.2～101.6
Depth of hot-rolled steel : 0.89
Annealed steel round bar via hot-rolling : 1.14
Annealed steel tubing via hot-rolling: 0.89
Annealed steel round bar via cold-working : -
Annealed steel tubing via cold-working : 0.61
Steel size/mm:＞101.6～127.0
Depth of hot-rolled steel : 1.40
Annealed steel round bar via hot-rolling : 1.65
Annealed steel tubing via hot-rolling: 1.02
Annealed steel round bar via cold-working : -
Annealed steel tubing via cold-working : 0.71
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