Find typical requirement for ASTM A193 Grade B7 Mechanical Properties for Metric and Imperial units. All intermediary or finished products manufactured to astm a193 grade b7 specification must comply to tensile strength, yield strength, elongation, reduction or area and hardness as per below requirement. This requirement is achieved by hardening AISI 4140 / 4142 alloy steel followed by tempering at temperatures specified below.
| Diameter mm | Min Tempering Temperature, °F | Tensile Strength min, MPa | Yield strength, min, 0.2% offset, MPa | Elongation in 4D min, % | Reduction of Area, min, % | Hardness, max |
|---|---|---|---|---|---|---|
| M64 and Under | 593 | 860 | 720 | 16 | 50 | 321 HBW or 35 HRC |
| over M64 to M100 | 593 | 795 | 655 | 16 | 50 | 321 HBW or 35 HRC |
| over M100 to M180 | 593 | 690 | 515 | 18 | 50 | 321 HBW or 35 HRC |
| Diameter Inch | Min Tempering Temperature, °F | Tensile Strength min, ksi | Yield strength, min, 0.2% offset, ksi | Elongation in 4D min, % | Reduction of Area, min, % | Hardness, max |
|---|---|---|---|---|---|---|
| 2.5 and under | 1100 | 125 | 105 | 16 | 50 | 321 HBW or 35 HRC |
| over 2.5 to 4 | 1100 | 115 | 95 | 16 | 50 | 321 HBW or 35 HRC |
| over 4 to 7 | 1100 | 100 | 75 | 18 | 50 | 321 HBW or 35 HRC |