Alloy Steel
Alloy steel is a type of steel alloyed with several elements such as molybdenum, manganese, nickel, chromium, vanadium, silicon, and boron. These alloying elements are added to increase strength, hardness, wear resistance, and toughness. The amounts of alloying elements may vary between 1 and 50%.
Alloy Steel Grades :
| Steel category | ASTM / ASME standard | |||
|---|---|---|---|---|
| Low Alloy Steel Plate | Low Alloy Steel Pipe | SMAW Electrode/ Rod | Flux Cored Wires | |
| 0.5%Mo | A204 Grade A,B,C A336 Grade F1 | A209 Grade T1 A335 Grade P1 | GL76/78A1 | GMX 811A1 |
| 0.5%Cr-0.5%Mo | A387 Grade 2 CI.1,2 | A213 Grade T2 A335 Grade P2 | GL86/88B1 | |
| 1.25%Cr-0.5%Mo | A387 Grade 12 Cl.1,2 A387 Grade 11 CI.1,2 A336 Grade F11 | A213 Grade T11, 12 A335 Grade P11, 12 A182 Grade F11 | GL86/88B2 | GMX 811B2 |
| 2.25%Cr-1.0%Mo | A387 Grade 22 CI.1,2 A336 Grade F22 | A213 Grade T22 A335 Grade P22 A182 Grade F22 | GL86/88B3 | GMX 911B3 |
| 5.0%Cr-0.5%Mo | A387 Grade 5 CI.1,2 | A335 Grade P5 | GL86/88B6 | |
| 9.0%Cr-1.0%Mo | A387 Grade 9 CI.1,2 | A335 Grade P9 | GL86/88B8 | |
Chemical Compositions:
Element |
Symbol |
wt. % |
Aluminium |
Al |
0.95–1.30 |
Bismuth |
Bi |
– |
Boron |
B |
0.001–0.003 |
Chromium |
Cr |
0.5–2.0 |
4–18 |
||
Copper |
Cu |
0.1–0.4 |
Lead |
Pb |
– |
Manganese |
Mn |
0.25–0.40 |
>1 |
||
Molybdenum |
Mo |
0.2–0.5 |
Nickel |
Ni |
2–5 12–20 |
Silicon |
Si |
0.2–0.7 |
2 |
||
Higher % |
||
Sulfur |
S |
0.08–0.15 |
Titanium |
Ti |
– |
Tungsten |
W |
– |
Vanadium |
V |
0.15 |