COLD FINISHED CARBON STEEL BARS
COMPOSITION OF COLD FINISHED CARBON STEEL BARS
|
Grade
|
Relative 可加工性, Based on 1212 as 100% |
Carbon % |
Magnesium % |
Phosphorous % |
|
4140 Annealed |
65 |
0.38-0.43 |
0.75-1.00 |
0.035 Max |
|
8620 |
65 |
0.18-0.23 |
0.70-0.90 |
0.035 Max |
|
Grade
|
Sulfur % |
Silicon % |
Nickel % |
Chromium % |
Molybdenum % |
|
4140 Annealed |
0.04 Max |
0.15-0.35 |
– |
0.80-1.10 |
0.15-0.25 |
|
8620 |
0.04 Max |
0.15-0.35 |
0.40-0.70 |
0.40-0.60 |
0.1 |
| CARBON: | Hardening element, strength, and hardness increase with increased carbon content. |
| MANGANESE: | Contributes to strength and hardness, decreases weldability. |
| PHOSPHORUS: | Contributes to strength and hardness, decreases ductility (ability to withstand deformation without rupture). |
| SULFUR: |
Decreases weldability, detrimental to surface quality. |
| SILICON: |
Contributes to strength and hardness, decreases machinability. |
| NICKEL: |
Increases toughness (resistance to impact fracture), broadens heat treatment temperature range. |
| CHROMIUM: |
Promotes hardenability, enhances corrosion resistance. |
| MOLYBDENUM: |
Promotes hardenabilty, broadens heat treatment temperature range. |