ASTM Hot Rolled Alloy Steel Round Bars S20C
ASTM A29/A29M specification covers a range of hot-rolled alloy steel bars S20C. These bars can be used for general engineering purposes, including manufacturing gear parts, shafts, axles, keys, and studs. They are typically produced in round, square, and hexagonal shapes, with diameters ranging from 5.5mm to 250mm. Additionally, ASTM A29/A29M specifies the chemical composition, mechanical properties, and other relevant requirements for S20C alloy steel bars.
- Material: high-quality alloy steel, which means it has excellent strength and durability.
- Diameter: The diameter of the round bars can vary from 10mm to 200mm, making it suitable for various applications.
- Length: The length of the bars can vary from 6 meters to 12 meters, allowing for flexibility in usage.
- Heat Treatment: The bars are subjected to heat treatment processes such as annealing, quenching, and tempering, which ensures that they have high strength and durability.
- Surface Finish: The surface finish of these bars is smooth and polished, making them ideal for applications where aesthetics are important.
- Chemical Composition: The chemical composition of the ASTM Hot Rolled Alloy Steel Round Bars S20C is carefully controlled to ensure that it meets industry standards and is free from impurities.
1.AISI 1020 steel Supply Form & Size
| Form of Supply | Size(mm) | Length(mm) |
| Round bar | Φ6-Φ1,000 | 3,000-10,000 |
| Square bar | 100x100-600x600 | 3,000-6,000 |
| Plate/Sheet | Thickness :20-400 Width:80-1,000 |
2,000-6,000 |
| Flat bar/Blcoks | Thickness :120-800 Width:120-1,500 |
2,000-6,000 |
2.Surface Finish&Tolerance
| Surface Finish | Black-Forged | Black-Rolled | Turned | Grinding | Polished | Peeled | Cold Drawn |
| Tolerance | (0，+5mm) | (0，+1mm) | (0，+3mm) | Best h9 | Best h11 | Best H11 | Best H11 |
3.Chemical Composition&Related Specifications
| Grade | C | Si | Mn | P | S |
| 1020 | 0.17-0.23 | ≤ 0.4 | 0.30-0.60 | ≤ 0.04 | ≤ 0.05 |
| Germany | UK | China | Japan |
| C22/1.0402 | EN3/070M20 | 20# | S20C |
4.Mechanical Property
| properties | Metric | Imperial |
| Tensile strength | 420 MPa | 60900 psi |
| Yield strength | 350 MPa | 50800 psi |
| Modulus of elasticity | 205 GPa | 29700 ksi |
| Shear modulus (typical for steel) | 80 GPa | 11600 ksi |
| Poisson’s ratio | 0.29 | 0.29 |
| Elongation at break (in 50 mm) | 0.15 | 0.15 |
| Hardness, Brinell | 121 | 121 |
| Hardness, Knoop (converted from Brinell hardness) | 140 | 140 |
| Hardness, Rockwell B (converted from Brinell hardness) | 68 | 68 |
| Hardness, Vickers (converted from Brinell hardness) | 126 | 126 |
| Machinability (based on AISI 1212 steel. as 100 machinability) | 65 | 65 |
5.AISI 1020 steel Forging
Forging temperature:950-1200℃,air cooling after forging.
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