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GET PRICEASTM A 829 - SAE 4140 and ASTM A 829 - SAE 4142 are vacuum degassed fine grained steels which are particularly used by the customers for heavy machinery applications. Possible delivery conditions are annealed (subcritical annealing), normalized for ASTM A 829 - SAE 4140 and normalized + tempered for ASTM A 829 - SAE 4142.
ASTM A 829 - SAE 4142 Chemical Compositions(%)
For the ladle analysis the following limiting values in % are applicable: (a product analysis can be agreed upon request)
|
| C | Si | Mn | P | S | Cr | Mo |
| ASTM A 829 - SAE 4142 | 0.38 - 0.46 | 0.15 - 0.35 | 0.75 - 1.70 b) | ≤ 0.020 | ≤ 0.005 | 0.80 - 1.10 | 0.15 - 0.25 |
ASTM A 829 - SAE 4142 Delivery condition and hardness (tensile strength)
| Delivery condition | Thickness | Hardness HBW (tensile strength in MPa / ksi) | ||
|
|
| ASTM A 829 - SAE 4140 | ASTM A 829 - SAE 4142. | |
| annealed (subcritical annealing) | all | ≤ 240 (≤ 800 / 116) | ≤ 250 (≤ 834 / 121) | |
|
normalized a) | ≤ 38 mm | ≤ 1½ in | ≤ 320 (≤1052 / 152) |
|
| > 38 ≤ 76 mm | > 1½ ≤ 3 in | ≤ 300 (≤ 1002 / 145) |
| |
| > 76 mm | > 3 in | ≤ 270 (≤ 900 / 131) |
| |
| normalized a)+ tempered | all |
| 260 – 310 (869 – 1025 / 126 - 149) | |
ASTM A 829 SAE 4142 Mechanical Properties
Annealed:
Tensile Strength (min) - 100,000 psi
Elongation (min) - 18%
Reduction of Area (min) - 50%
Hardness: 22RC max
Charpy V-Notch at -50˚F – 20 FT LBS average- Minimum15 FT LB
Reduction Ratio – Minimum 4:1
ASTM A 829 SAE 4142 alloy structure steel plate specification:
Standard: SAE 4142
Thickness :6mm -150mm
Width :1600mm-4100mm
Length :3m,6m,8m,12m etc.
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