| Alloy Steel

Alloy steel is a type of steel that contains other elements such as nickel, chromium, molybdenum, vanadium, and tungsten, in addition to carbon and iron. These alloying elements impart specific properties to the steel, such as increased strength, hardness, and resistance to wear and corrosion. Here is a brief description of alloy steel pipe, tube, flange, fastener, fittings, and round bar

Grade Composition Tensile Strength (MPa) Yield Strength (MPa) Hardness (HB) Applications
EN19 C: 0.40-0.45, Cr: 0.80-1.10, Mo: 0.15-0.25 850-1000 600-750 248-300 Gears, shafts, axles, high-stress components
EN24 C: 0.30-0.40, Cr: 1.00-1.40, Ni: 1.00-1.30 900-1100 650-800 250-320 Aircraft parts, high-strength components
EN36 C: 0.30-0.40, Cr: 1.00-1.20, Ni: 0.80-1.20 900-1100 650-800 250-320 Heavy-duty gears, crankshafts
4140 C: 0.38-0.43, Cr: 0.80-1.10, Mo: 0.15-0.25 690-900 415-655 197-285 Machinery, tools, automotive applications
F11 C: 0.05-0.15, Cr: 1.00-1.50, Mo: 0.40-0.60 450-690 280-485 130-200 High-temperature applications, pressure vessels
F22 C: 0.05-0.15, Cr: 2.00-2.50, Mo: 0.80-1.20 450-690 280-485 130-200 Power generation, petrochemical applications
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 Cl.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 Cl.1,2 A336 Grade F11 A213 Grade T11, T12 A335 Grade P11, P12 A182 Grade F11 GL86/88B2 GMX 811B2
2.25% Cr-1.0% Mo A387 Grade 22 Cl.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 Cl.1,2 A335 Grade P5 GL86/88B6
9.0% Cr-1.0% Mo A387 Grade 9 Cl.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